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    <title>My learning and diary</title>
    <link>https://jackliusr.github.io/</link>
    <description>Recent content on My learning and diary</description>
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    <language>en-us</language>
    <lastBuildDate>Mon, 27 Apr 2026 20:00:00 +0800</lastBuildDate><atom:link href="https://jackliusr.github.io/index.xml" rel="self" type="application/rss+xml" />
    <item>
      <title>Exploring spec-driven development with Ontologies and Domain Design Models</title>
      <link>https://jackliusr.github.io/posts/2026/04/exploring-spec-driven-development-with-ontologies-and-domain-design-models/</link>
      <pubDate>Mon, 27 Apr 2026 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/04/exploring-spec-driven-development-with-ontologies-and-domain-design-models/</guid>
      <description>Introduction One of the more interesting recent developments in Retrieval-Augmented Generation (RAG) is Knowledge Graph–based RAG. Unlike traditional vector-based retrieval, this approach introduces structured relationships between entities, enabling deeper reasoning and better contextual understanding.
 This naturally raises a question:
  Can we build more robust and reliable software systems by combining:
   Ontologies
  Domain-specific design models
  Spec-driven development (SDD)
     This article explores that idea through a practical comparison.</description>
    </item>
    
    <item>
      <title>Running Qwen3.6 35B Locally with Ollama and VS Code Integration</title>
      <link>https://jackliusr.github.io/posts/2026/04/running-qwen3.6-35b-locally-with-ollama-and-vs-code-integration/</link>
      <pubDate>Fri, 17 Apr 2026 13:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/04/running-qwen3.6-35b-locally-with-ollama-and-vs-code-integration/</guid>
      <description>Overview Running large language models locally is becoming increasingly practical, even for developers without access to massive GPU clusters.
 In this post, I walk through how to:
   Run Qwen3.6 35B (A3B, Q4_K_M quantized) locally using Ollama
  Integrate the model into VS Code
  Use it as a local coding assistant
   This setup is especially useful for:
   Air-gapped environments</description>
    </item>
    
    <item>
      <title>Running vLLM on AMD AI MAX&#43; 395 (ROCm, Ubuntu 24.04)</title>
      <link>https://jackliusr.github.io/posts/2026/03/running-vllm-on-amd-ai-max-395-rocm-ubuntu-24.04/</link>
      <pubDate>Wed, 25 Mar 2026 13:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/03/running-vllm-on-amd-ai-max-395-rocm-ubuntu-24.04/</guid>
      <description>Finally, I managed to get vLLM running on my AMD AI MAX+ 395 GPU on Ubuntu 24.04.
 It was not straightforward — ROCm support on Ryzen AI (gfx1151) is still evolving, and I ran into multiple low-level GPU faults before finding a stable setup.
 This post documents: - What didn’t work - The errors I encountered - The working configuration
 Hopefully this saves you a few hours (or days).</description>
    </item>
    
    <item>
      <title>Can Claude Code Use GitHub Copilot as a Backend? A Practical Exploration</title>
      <link>https://jackliusr.github.io/posts/2026/03/can-claude-code-use-github-copilot-as-a-backend-a-practical-exploration/</link>
      <pubDate>Mon, 23 Mar 2026 19:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/03/can-claude-code-use-github-copilot-as-a-backend-a-practical-exploration/</guid>
      <description>Introduction Recently, I’ve been experimenting with a variety of LLM tooling ecosystems, including:
   Claude Code
  Codex via OpenRouter
  Ollama
  LM Studio
  vLLM
  LiteLLM
   My goal is to better understand the underlying technologies and explore how to operate these tools in air-gapped or controlled environments.
 In many enterprise settings, developers are allowed to use GitHub Copilot, but not Claude Code.</description>
    </item>
    
    <item>
      <title>Spec-Kit &#43; Ralph Loop — A Practical Workflow for AI-Driven Development</title>
      <link>https://jackliusr.github.io/posts/2026/03/spec-kit--ralph-loop-a-practical-workflow-for-ai-driven-development/</link>
      <pubDate>Tue, 17 Mar 2026 16:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/03/spec-kit--ralph-loop-a-practical-workflow-for-ai-driven-development/</guid>
      <description>I first learnt the idea of the Ralph Loop around January, while following developments in LLMs and AI through multiple channels — video feeds, X, newsletters, GitHub repositories, news, and research papers.
 That sparked a question:
 What happens if we combine the Ralph Loop with spec-driven design to generate real, working applications?
 This blog is a reflection of that exploration.
    My Background with Spec-Kit Since December last year, I have been using Spec-Kit in both:</description>
    </item>
    
    <item>
      <title>Claude Code with OpenRouter</title>
      <link>https://jackliusr.github.io/posts/2026/03/claude-code-with-openrouter/</link>
      <pubDate>Sun, 15 Mar 2026 22:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/03/claude-code-with-openrouter/</guid>
      <description>I have been using GitHub Copilot and Copilot CLI for about one year. During that time, I also experimented with several developer tools and AI-assisted coding technologies. Recently I became interested in exploring Claude Code and related tools such as Claude Cowork.
 However, I did not want to immediately commit to a subscription before understanding whether Claude Code actually fits my workflow. So I spent some time experimenting with different ways to run Claude Code without paying for a subscription first.</description>
    </item>
    
    <item>
      <title>setup openclaw hetzner</title>
      <link>https://jackliusr.github.io/posts/2026/02/setup-openclaw-hetzner/</link>
      <pubDate>Wed, 04 Feb 2026 22:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/02/setup-openclaw-hetzner/</guid>
      <description>Things are changing incredibly fast, and AI is undeniably the hottest topic right now. There’s no real option to stand still—the only sensible choice is to embrace the change and learn by doing.
 Recently, OpenClaw has stood out as one of the most exciting personal AI assistant projects. After following the project for several days and spending time reading through its documentation—especially around skills and agents—I decided to try it out myself.</description>
    </item>
    
    <item>
      <title>spec-kit: iteration workflow in a feature</title>
      <link>https://jackliusr.github.io/posts/2026/02/spec-kit-iteration-workflow-in-a-feature/</link>
      <pubDate>Mon, 02 Feb 2026 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/02/spec-kit-iteration-workflow-in-a-feature/</guid>
      <description>Building with LLMs: How Spec-Kit Changed My Workflow Over the past three years, I’ve used LLMs—such as ChatGPT, Copilot, and Claude—primarily as assistants to generate code snippets for very specific requirements. They were useful, but always in a limited way: small pieces of logic, isolated helpers, or syntax scaffolding.
What I didn’t do until recently was build an entire system around an LLM.
The main reason was simple: most of my real work lives inside internal frameworks, legacy systems, and opinionated architectures.</description>
    </item>
    
    <item>
      <title>setup vllm on macbook m4</title>
      <link>https://jackliusr.github.io/posts/2026/01/setup-vllm-on-macbook-m4/</link>
      <pubDate>Sat, 31 Jan 2026 22:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2026/01/setup-vllm-on-macbook-m4/</guid>
      <description>Introduction Several days ago, I setup ollama on my MacBook M4, and it works pretty well. At that time, I tried to use it with copilt with local models codegemma:7b and qwen3:8b. My expectation was not so high as the hardware configuration of my macbook pro m4 is just a entry level, just want to see how it works. I also learned there are other options such as vllm. After comparing the two, I found vllm is more flexible, powerful, product-ready, used widely in enterprises.</description>
    </item>
    
    <item>
      <title>Airgapped Kubernetes Cluster with containerd</title>
      <link>https://jackliusr.github.io/posts/2025/11/airgapped-kubernetes-cluster-with-containerd/</link>
      <pubDate>Sat, 15 Nov 2025 08:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2025/11/airgapped-kubernetes-cluster-with-containerd/</guid>
      <description>After evaluating several local Kubernetes solutions I encountered repeated manual steps (downloading bootstrap images, pulling images from registry mirrors and retagging them, and loading images into clusters) that were time-consuming and error-prone. I decided to set up a properly air-gapped Kubernetes cluster using kubeadm and containerd, leveraging containerd’s registry mirror support. This post documents the steps I followed.
 Prerequisites This guide assumes a Debian/Ubuntu host. Installing the latest Docker Engine will also provide containerd as a dependency.</description>
    </item>
    
    <item>
      <title>From Batch to Real-Time: Rethinking File Processing with Linux fanotify</title>
      <link>https://jackliusr.github.io/posts/2025/09/from-batch-to-real-time-rethinking-file-processing-with-linux-fanotify/</link>
      <pubDate>Thu, 18 Sep 2025 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2025/09/from-batch-to-real-time-rethinking-file-processing-with-linux-fanotify/</guid>
      <description>Traditionally, batch processing of files has been the default approach in many on-premise solutions. Files are dropped into a directory, collected on a schedule, and processed in groups. This model works fine for systems where latency is not critical, but once you start asking “How do we make this real-time?” the story becomes more interesting.
 At first, my answer was polling. After all, if we want near real-time, we can just keep checking the directory at short intervals.</description>
    </item>
    
    <item>
      <title>Find all extension methods of a type in csharp using ast-grep</title>
      <link>https://jackliusr.github.io/posts/2025/04/find-all-extension-methods-of-a-type-in-csharp-using-ast-grep/</link>
      <pubDate>Sun, 06 Apr 2025 22:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2025/04/find-all-extension-methods-of-a-type-in-csharp-using-ast-grep/</guid>
      <description>Usually one will use simple find or more advanced regular expression based search to locate codes. How about use other options usig ast to get more accurate results and have the potential to use for codemod? In the past 2 days, I finally figured how to use ast-grep to find code.
 Here I will use it to find all extension methods of an class. The rule is configured below.</description>
    </item>
    
    <item>
      <title>Speeding Up DevSecOps: Rethinking the Shift-Left Approach</title>
      <link>https://jackliusr.github.io/posts/2025/02/speeding-up-devsecops-rethinking-the-shift-left-approach/</link>
      <pubDate>Thu, 13 Feb 2025 22:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2025/02/speeding-up-devsecops-rethinking-the-shift-left-approach/</guid>
      <description>Introduction In the world of modern software development, Shift-Left Security and DevSecOps have become de facto practices. The idea is simple: security should not be an afterthought but rather an integral part of the development lifecycle, starting as early as possible. While these practices strengthen security and compliance, they often introduce additional steps that can slow down the development pipeline. This raises an important question: Is there a way to speed things up without sacrificing security?</description>
    </item>
    
    <item>
      <title>Building Immutable Infrastructure Without Containers</title>
      <link>https://jackliusr.github.io/posts/2024/12/building-immutable-infrastructure-without-containers/</link>
      <pubDate>Sun, 08 Dec 2024 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/12/building-immutable-infrastructure-without-containers/</guid>
      <description>Immutable infrastructure is a concept that has revolutionized the way we think about deploying and maintaining systems. It ensures that once an instance of infrastructure is created, it is never modified. Instead, any changes require the creation of a new instance. This approach enhances consistency, reduces configuration drift, and simplifies rollback processes. While immutable infrastructure is often associated with Infrastructure as Code (IaC) and containers, it’s entirely possible—and sometimes necessary—to implement it with Virtual Machines (VMs) instead of containers.</description>
    </item>
    
    <item>
      <title>Aspire, Podman in windows</title>
      <link>https://jackliusr.github.io/posts/2024/10/aspire-podman-in-windows/</link>
      <pubDate>Thu, 24 Oct 2024 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/10/aspire-podman-in-windows/</guid>
      <description>REM download https://github.com/containers/podman/releases/download/v5.2.5/podman-remote-release-windows_amd64.zip REM unzip it to C:\DIM\podman-remote-release-windows_amd64 SET PODMAN_HOME=C:\DIM\podman-remote-release-windows_amd64\podman-5.2.5 set PATH=%PATH%;%PODMAN_HOME%\usr\bin podman machine init podman machine start set DOTNET_ASPIRE_CONTAINER_RUNTIME=podman   Get podman desktop from https://podman.io/
 </description>
    </item>
    
    <item>
      <title>Speed up postgresql container without initing everytime</title>
      <link>https://jackliusr.github.io/posts/2024/10/speed-up-postgresql-container-without-initing-everytime/</link>
      <pubDate>Thu, 24 Oct 2024 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/10/speed-up-postgresql-container-without-initing-everytime/</guid>
      <description>A newly created postgresql container will do a following steps. They are quite time consuming in integration testing and add some unpredictable factor. If a integration testing will clean up tables and data, volumes can be used to speed up postgresql container.
   pg_ctl -D /var/lib/postgresql/data -l logfile start
  initdb
  stop postgresql and start again
   There might be one issue, do I need to maintain the same credential?</description>
    </item>
    
    <item>
      <title>expert beginner vs Generalizing Specialists vs icicle-shaped vs t-shaped</title>
      <link>https://jackliusr.github.io/posts/2024/10/expert-beginner-vs-generalizing-specialists-vs-icicle-shaped-vs-t-shaped/</link>
      <pubDate>Tue, 22 Oct 2024 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/10/expert-beginner-vs-generalizing-specialists-vs-icicle-shaped-vs-t-shaped/</guid>
      <description>Today I read an article Learning to learn and it mentions the concept &amp;#34;expert beginner&amp;#34; I learnt in past. I am wondering the differences among other concepts (namely generalizing Specialists, icicle-shaped vs t-shaped) in those domain, where I fall into the category, do I do the correct career choices etc.
 The differences among them can be quickly generated from chatgpt, I quoted the answers here for quick references.
     Aspect Expert Beginner T-Shaped Professional Generalizing Specialist Icicle-Shaped Specialist     Skill Depth</description>
    </item>
    
    <item>
      <title>Change content of a file in block or byte level</title>
      <link>https://jackliusr.github.io/posts/2024/10/change-content-of-a-file-in-block-or-byte-level/</link>
      <pubDate>Sat, 19 Oct 2024 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/10/change-content-of-a-file-in-block-or-byte-level/</guid>
      <description>Since wrote Things learnt from recent preparation of 1T data for testing, I had figured out how to do that on the following weekends. Today I couldn’t get the steps to do so immediately. It is better to note down for my next time usage. The detailed steps is as following
  Find the location in the file
  Get the block contains contents to modify
  Extract the block to a file and modify it</description>
    </item>
    
    <item>
      <title>Things learnt from recent preparation of 1T data for testing</title>
      <link>https://jackliusr.github.io/posts/2024/10/things-learnt-from-recent-preparation-of-1t-data-for-testing/</link>
      <pubDate>Wed, 09 Oct 2024 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/10/things-learnt-from-recent-preparation-of-1t-data-for-testing/</guid>
      <description>Several things learnt from recent preparation of data for testing.
 Question the way when it takes too long to process data sed: remove last n lines In the past I always thought sed is the fastest way to manipulate data. Is it true for all the cases? I generated 1T testing data in ndjson format, however the last lines of those files are corrupted json data. I had to remove the last line.</description>
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    <item>
      <title>Mermaid flow with subgraph control</title>
      <link>https://jackliusr.github.io/posts/2024/08/mermaid-flow-with-subgraph-control/</link>
      <pubDate>Tue, 20 Aug 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/08/mermaid-flow-with-subgraph-control/</guid>
      <description>One thing constantly bothered me since I used mermaid for flowchart, how to correctly group elements in a group. Only today I have a thought about what will happen if I put node in subgraph without links between them. Finally I got it works to correctly group elements in a group.
Another things, mermaid diagram is natively supported in asciidoctor now. This one is my first example to use it.</description>
    </item>
    
    <item>
      <title>Clojure for real competitive edge and performance</title>
      <link>https://jackliusr.github.io/posts/2024/08/clojure-for-real-competitive-edge-and-performance/</link>
      <pubDate>Tue, 06 Aug 2024 16:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/08/clojure-for-real-competitive-edge-and-performance/</guid>
      <description>In Beating the average, Paul Graham mentioned lisp is the secret weapon behind his startups, he also elaborated on that point. I believed deeply that after I wrote some small programmings in common lisp before I learnt reddit pilot from lisp to python. Since then I always doubt if the power of lisp is still relevant considering that java, dotnet, python and ruby ecosystems are more mature than that time.</description>
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    <item>
      <title>Inconsistent templates in visual studio and dotnet cli when dotnet_cli_home set to custom location</title>
      <link>https://jackliusr.github.io/posts/2024/08/inconsistent-templates-in-visual-studio-and-dotnet-cli-when-dotnet_cli_home-set-to-custom-location/</link>
      <pubDate>Thu, 01 Aug 2024 16:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/08/inconsistent-templates-in-visual-studio-and-dotnet-cli-when-dotnet_cli_home-set-to-custom-location/</guid>
      <description>Due to security policy, I had to set dotnet_cli_home to non-default location to run some building steps. Things went quite well until not. All my command line usages and batch scripts work, until I tried to create a project using the custom project template via Visual Studio and noticed that old deleted template was shown in &amp;#34;Create a new project&amp;#34; dialog.
 I tried several options and none of them works for my case.</description>
    </item>
    
    <item>
      <title>How firely sdk handle extra fields (not extension) in Poco and ISourceNode</title>
      <link>https://jackliusr.github.io/posts/2024/07/how-firely-sdk-handle-extra-fields-not-extension-in-poco-and-isourcenode/</link>
      <pubDate>Tue, 23 Jul 2024 10:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/07/how-firely-sdk-handle-extra-fields-not-extension-in-poco-and-isourcenode/</guid>
      <description>Most time, I think json is forward and backward compatible as long as some convention is kept such as adding fields only etc. I always thought so since I studied CQRS and event sourcing. Is it true for FHIR, especially firely sdk? I answered so in a discussion, however I doubted it as I didn’t do it in FHIR. Here I have a short code to demostrate the two case. In the end, the result is yes and no.</description>
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    <item>
      <title>Setup visual studio 2022 in restricted environment</title>
      <link>https://jackliusr.github.io/posts/2024/07/setup-visual-studio-2022-in-restricted-environment/</link>
      <pubDate>Tue, 23 Jul 2024 10:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/07/setup-visual-studio-2022-in-restricted-environment/</guid>
      <description>uninstall vs and vsinstaller
  restart machine
  download below two vs cpp redist and install first before install visual studio https://aka.ms/vs/17/release/vc_redist.x86.exe https://aka.ms/vs/17/release/vc_redist.x64.exe
  download the latest version of VisualStudioSetup.exe from https://c2rsetup.officeapps.live.com/c2r/downloadVS.aspx?sku=professional&amp;amp;channel=Release&amp;amp;version=VS2022&amp;amp;source=VSLandingPage&amp;amp;cid=2030:a4e034a4e73f4c1cb41366109a953e4d
  choose download all and install when installing visual studio after choosing components to install
  Clear Visual Studio Component Cache
 Close Visual Studio (ensure devenv.exe is not present in the Task Manager)</description>
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    <item>
      <title>Fold and Reduce in LINQ</title>
      <link>https://jackliusr.github.io/posts/2024/07/fold-and-reduce-in-linq/</link>
      <pubDate>Thu, 04 Jul 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/07/fold-and-reduce-in-linq/</guid>
      <description>In functional programming languages, there are several difference betwee them. I was quite interested in functional programming, even I spent some time to learn haskel and scala. I knew what I can use Select for map, not sure about folder and reduce
 FeatureFoldReduceInitial ValueRequires an initial value.Does not require an initial value.Function Signature(A, B) =&amp;gt; A(A, A) =&amp;gt; AApplicabilityCan be used on empty collections.Requires a non-empty collection.VariantsfoldLeft and foldRightreduceLeft and reduceRightStarting PointfoldLeft starts from the left.</description>
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    <item>
      <title>streamline pack and install package to global-packages</title>
      <link>https://jackliusr.github.io/posts/2024/07/streamline-pack-and-install-package-to-global-packages/</link>
      <pubDate>Thu, 04 Jul 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/07/streamline-pack-and-install-package-to-global-packages/</guid>
      <description>Due to the nature that it is difficult to debug msbuild custom task, I thought if I can use it in a way to streamline my debug workflow. one pack command will complete the following steps. - pack - add the package into local feed source - add the package to global-packages folder
 My current workflow is below. It is a manual process. It is realy a pain this way: - pack - nuget add [package-name] -source C:\nexus\.</description>
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    <item>
      <title>msbuild custom task and runtime reflection</title>
      <link>https://jackliusr.github.io/posts/2024/06/msbuild-custom-task-and-runtime-reflection/</link>
      <pubDate>Sun, 30 Jun 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/06/msbuild-custom-task-and-runtime-reflection/</guid>
      <description>Most information about custom task of msbuild are quite basic, it will get complicated when it is involved reflection. I tried several ways according searching results and answers from chatgpt: reflection, assemblyLoadContext and mono cecil. The most promising one is mono.cecil.
 I tried directly loading assemblies and via AssemblyLoadContext. They all failed to load some microsoft assemblies. It looks awkward even I can change my build scripts to copy those assemblies.</description>
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    <item>
      <title>CICD</title>
      <link>https://jackliusr.github.io/posts/2024/06/cicd/</link>
      <pubDate>Fri, 21 Jun 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/06/cicd/</guid>
      <description>I shared one of CICD I designed and implemented in linkedin. It is good to keep here as well. I researched several options and put my thought at Reflection on implementation of CICD using argo-workflows
   Nowadays, argo-workflows is quite mature. I will use argo-workflows for CI part in my future projects. It is definitely worth to invest one’s time on argo-workflow as it is widely used.
 </description>
    </item>
    
    <item>
      <title>.Net sdk version vs runtime version</title>
      <link>https://jackliusr.github.io/posts/2024/06/.net-sdk-version-vs-runtime-version/</link>
      <pubDate>Tue, 18 Jun 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/06/.net-sdk-version-vs-runtime-version/</guid>
      <description>What will you do when you encountered a runtime version is disallowed for specific version say 8.0.6 in building environment? Install the specific runtime version, right? Please hold, I show you my story.
 I initially thought I couldn’t run the below commands to install it, it is not. After several attempts, My colleague spotted the difference between runtime version and sdk version. They are different. A runtime version is supported by several sdk versions.</description>
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    <item>
      <title>setup nuget local packages feed</title>
      <link>https://jackliusr.github.io/posts/2024/06/setup-nuget-local-packages-feed/</link>
      <pubDate>Sun, 16 Jun 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/06/setup-nuget-local-packages-feed/</guid>
      <description>Nuget local feed Prerequisites nuget.exe is installed in C:\packages and in the command search path.
  Setup local feed Assume C:\packages\.nuget-local\packages will be the locations to install local packages. and several local dev packages need to install.
 Packages below: - &amp;#34;C:\packages\test.4.1.0-beta-24159.1.nupkg&amp;#34; - &amp;#34;C:\packages\testa.4.1.0-beta-24159.1.nupkg&amp;#34; - &amp;#34;C:\packages\testb.S3.4.1.0-beta-24159.1.nupkg&amp;#34;
 Run below commands to install above packages into source C:\packages\.nuget-local\packages
 REM run command line with C:\packages as working directory nuget.exe add tes.</description>
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    <item>
      <title>MACH (micro service based, API first, cloud native, headless)</title>
      <link>https://jackliusr.github.io/posts/2024/06/mach-micro-service-based-api-first-cloud-native-headless/</link>
      <pubDate>Wed, 12 Jun 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/06/mach-micro-service-based-api-first-cloud-native-headless/</guid>
      <description>Just an architecture style MACH got me attention. It is short for micro service based, API first, cloud native, headless. There are two of projects I involved one are in this architecture style. One is sitecore based, another one is developed. Kubernetes, nodejs, npm, strapi tsoa are used. Their mapping is as following.
   micro services based: multiple services based on expressjs
  api first: tsao
  cloud native: more advanced than cloud native, kubernate native is used.</description>
    </item>
    
    <item>
      <title>Recent learnings in dotnet and FHIR</title>
      <link>https://jackliusr.github.io/posts/2024/06/recent-learnings-in-dotnet-and-fhir/</link>
      <pubDate>Wed, 12 Jun 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/06/recent-learnings-in-dotnet-and-fhir/</guid>
      <description>In the past several months, I called it quite intensive. I need to master the knowledge of FHIR, advanced dotnet technologies (attributes, generator, reflection, code emit, expression tree, advanced linq, customized aspnet pipeline, nuget package), code optimization technologies and several aws technologies (DynamoDB, S3, glue, spark) in depth to meet the schedule of a project. You really can’t account on solution architects or support engineers from cloud providers. I don’t get one perfect answers from them so far when I used their services.</description>
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    <item>
      <title>Accelerated learning in a new era with AGI</title>
      <link>https://jackliusr.github.io/posts/2024/05/accelerated-learning-in-a-new-era-with-agi/</link>
      <pubDate>Sun, 12 May 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/05/accelerated-learning-in-a-new-era-with-agi/</guid>
      <description>It is about three months now. I make reflections on things I have done well and bad. I will refine my learning workflow.
 In the past, I used 2nd-brain, daily-logging, flashcard and spaced-repetition systems to help to accelerate my learning under the circumstance that I can’t get fully complete information from different stake holders. I was left with only way to find it out by myself. I read all material I thought will be useful and noted them down in my logseq vault.</description>
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    <item>
      <title>DynamoDB predictable performance</title>
      <link>https://jackliusr.github.io/posts/2024/05/dynamodb-predictable-performance/</link>
      <pubDate>Wed, 01 May 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/05/dynamodb-predictable-performance/</guid>
      <description>I am passionate about technological details and how things work under the hood. Recently I didn’t get confirmative answers from AWS. I spent a half day to re-read the famous paper. and the new one Amazon DynamoDB: A Scalable, Predictably Performant, and Fully Managed NoSQL Database Service. I think the following several concepts can be helpful to under its predictable performance.
 Consistent Hashing and zero hop DHT        Storage node and 10G partition        Typical flow of putItem      I also put all of the three pictures into a slides and put refereneres at the last slides.</description>
    </item>
    
    <item>
      <title>SaaS, token bucket, fairness and business practices</title>
      <link>https://jackliusr.github.io/posts/2024/04/saas-token-bucket-fairness-and-business-practices/</link>
      <pubDate>Mon, 29 Apr 2024 16:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/saas-token-bucket-fairness-and-business-practices/</guid>
      <description>I always thought SaaS are based shardig, load balance and multiple-tenant. In the past several days, I re-read Dynamo and DynamoDB papers to figure out some key info to share with my colleages to find a common ground about DynamoDB. One thing is mentioned many times in DynamoDB is token-bucket. Suddenly a thought popped out my mind when I walked back after lunch with my colleague that token-bucket algorithm should be a component of SaaS and multiple-tenant.</description>
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    <item>
      <title>mindmap in hugo</title>
      <link>https://jackliusr.github.io/posts/2024/04/mindmap-in-hugo/</link>
      <pubDate>Sat, 20 Apr 2024 10:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/mindmap-in-hugo/</guid>
      <description>I used mindmap in my logseq, however it show left to right side, the start node is always at the left side. I prefer to have the main concept shown in the center. Jsmind is the perfect fit after I saw its demos. Here is I create a shortcode in my hugo and try to create a demo mindmap using jsmind.
   &#34;\n{\n \&#34;meta\&#34;:{\n \&#34;name\&#34;:\&#34;jsMind remote\&#34;,\n \&#34;author\&#34;:\&#34;hizzgdev@163.com\&#34;,\n \&#34;version\&#34;:\&#34;0.2\&#34;\n },\n \&#34;</description>
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    <item>
      <title>Run athena and pyspark locally</title>
      <link>https://jackliusr.github.io/posts/2024/04/run-athena-and-pyspark-locally/</link>
      <pubDate>Mon, 15 Apr 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/run-athena-and-pyspark-locally/</guid>
      <description>Best practice or &amp;#34;aws configure&amp;#34; will put ~/.aws/config and ~/.aws/credentials in the 600 mode. however if you follow Developing using a Docker image, you will get several errors e.g. cant&amp;#39; find region, reach endpoints, or no access to resources.
 I run docker command as a normal user, docker daemon run as root user. The below scripts will run a docker image which default user is glue_user (10000). the mounted volume ~/.</description>
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    <item>
      <title>demo, run tikzjax from hugo</title>
      <link>https://jackliusr.github.io/posts/2024/04/demo-run-tikzjax-from-hugo/</link>
      <pubDate>Wed, 10 Apr 2024 18:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/demo-run-tikzjax-from-hugo/</guid>
      <description>I tried to use tikz in my logseq. However it fails to render correctly. Today I have time to try it in my hugo sites. Here is a demo from https://tikzjax.com/
  \begin{tikzpicture} \draw (0,0) circle (1in); \end{tikzpicture} )   </description>
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    <item>
      <title>Tools hope to have for JsonSchema</title>
      <link>https://jackliusr.github.io/posts/2024/04/tools-hope-to-have-for-jsonschema/</link>
      <pubDate>Wed, 10 Apr 2024 16:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/tools-hope-to-have-for-jsonschema/</guid>
      <description>When I was preparing a slides to recommend broad usage of JsonSchema, somethings I thought are good to have for general public usage. Those things troubled me for a while during I authored a JsonSchema.
 Versioning Currently there is no standard way how to define a version for a schema. I might use a version property for that. SemVer is good fit for the version content schema. Use if and else for different version.</description>
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    <item>
      <title>Data modeling of FHIR searchindices in AWS dynamoDB</title>
      <link>https://jackliusr.github.io/posts/2024/04/data-modeling-of-fhir-searchindices-in-aws-dynamodb/</link>
      <pubDate>Fri, 05 Apr 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/data-modeling-of-fhir-searchindices-in-aws-dynamodb/</guid>
      <description>Microsoft FHIR Server serialize searchindices this way in cosmosdb. How to model it in AWS DynamoDB?
 { &amp;#34;id&amp;#34;: &amp;#34;9240cda7-bbb7-4ad4-aa9f-971750a3dc71&amp;#34;, &amp;#34;searchIndices&amp;#34;: [ { &amp;#34;p&amp;#34;: &amp;#34;_id&amp;#34;, &amp;#34;c&amp;#34;: &amp;#34;9240cda7-bbb7-4ad4-aa9f-971750a3dc71&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;_lastUpdated&amp;#34;, &amp;#34;st&amp;#34;: &amp;#34;2018-08-22T23:37:56.1289012+00:00&amp;#34;, &amp;#34;et&amp;#34;: &amp;#34;2018-08-22T23:37:56.1289012+00:00&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;patient&amp;#34;, &amp;#34;r&amp;#34;: &amp;#34;Patient/example&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;performer&amp;#34;, &amp;#34;r&amp;#34;: &amp;#34;Practitioner/example&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;related&amp;#34;, &amp;#34;r_0&amp;#34;: &amp;#34;Observation/example-genetics-1&amp;#34;, &amp;#34;s_1&amp;#34;: &amp;#34;http://hl7.org/fhir/observation-relationshiptypes&amp;#34;, &amp;#34;c_1&amp;#34;: &amp;#34;derived-from&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;related-target&amp;#34;, &amp;#34;r&amp;#34;: &amp;#34;Observation/example-genetics-1&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;related-type&amp;#34;, &amp;#34;s&amp;#34;: &amp;#34;http://hl7.org/fhir/observation-relationshiptypes&amp;#34;, &amp;#34;c&amp;#34;: &amp;#34;derived-from&amp;#34; }, { &amp;#34;p&amp;#34;: &amp;#34;status&amp;#34;, &amp;#34;s&amp;#34;: &amp;#34;http://hl7.</description>
    </item>
    
    <item>
      <title>2 jsonschema tricks</title>
      <link>https://jackliusr.github.io/posts/2024/04/2-jsonschema-tricks/</link>
      <pubDate>Thu, 04 Apr 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/2-jsonschema-tricks/</guid>
      <description>Background I worked on APIs and OpenAPI Spec (OAS) in past projects, even I used stoplight and NLP for open-source API style guide enforce and linting. I thought I was quite good at jsonschema. I dont’k think so after recent usage of jsonschema for a very aspnet flexible configuration file.
 Configurations in dotnet are quite straight forwards if all the configurations following the Options pattern. ConfigurationProcessor is not that case.</description>
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    <item>
      <title>Using copilot for javascript debugging</title>
      <link>https://jackliusr.github.io/posts/2024/04/using-copilot-for-javascript-debugging/</link>
      <pubDate>Tue, 02 Apr 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/04/using-copilot-for-javascript-debugging/</guid>
      <description>Yesterday, I clicked a button in one web page, no response from that. I thought it must be something wrong. I opened browser console and noticed there is an icon. It turned out be a copilot icon after reading the logs in console.
      Nowadays, copilot almost is everywhere, office suite, vscode, visual studio, windows and edge browser. Never thought it is embedded in browse web console.</description>
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    <item>
      <title>Setup kind cluster using cilium cni in wsl2</title>
      <link>https://jackliusr.github.io/posts/2024/03/setup-kind-cluster-using-cilium-cni-in-wsl2/</link>
      <pubDate>Thu, 28 Mar 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/03/setup-kind-cluster-using-cilium-cni-in-wsl2/</guid>
      <description>Prologue One or two years ago, I tried several times to install kind cluster to using cilium cni. However I didn’t make it. Today I really want to setup one after reading an Kind cluster with Cilium and no kube-proxy and considering that major kubernetes distributions are using cilium cni now. After about 3 hours, I finally got it running successfully. Things don’t go smoothly. Here are my steps to setup it up.</description>
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    <item>
      <title>How to permanently exclude localhost from HSTS list in Google Chrome</title>
      <link>https://jackliusr.github.io/posts/2024/03/how-to-permanently-exclude-localhost-from-hsts-list-in-google-chrome/</link>
      <pubDate>Tue, 19 Mar 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/03/how-to-permanently-exclude-localhost-from-hsts-list-in-google-chrome/</guid>
      <description>Stackoverflow give several ways to resolve localhost HSTS issue (redirect from http to https). My laptop is managed by my employer and registry can’t be edited. &amp;#34;How can I see which sites have set the HSTS flag in my edge browser?&amp;#34; in chatgpt give me an answers. One step of the answer get my attention. I can change HSTS in my application for development environment.
 It is too late now.</description>
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    <item>
      <title>Install sqlserver in wsl2 and ubuntu 22.04</title>
      <link>https://jackliusr.github.io/posts/2024/03/install-sqlserver-in-wsl2-and-ubuntu-22.04/</link>
      <pubDate>Wed, 13 Mar 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/03/install-sqlserver-in-wsl2-and-ubuntu-22.04/</guid>
      <description>I searched web, first several links in SERP are not the offical one from microsoft. I tried them and failed to install mssql due to errors Error: &amp;#39;deb [arch=amd64 https://download.docker.com/linux/ubuntu \ xenial \ stable&amp;#39; invalid] or Can’t install MS SQL Server on Ubuntu 21.10. At last I follow the instruction from microsoft. I successfully installed mssql server in my wsl+ubuntu22.04 environment.
 curl -fsSL https://packages.microsoft.com/keys/microsoft.asc | sudo gpg --dearmor -o /usr/share/keyrings/microsoft-prod.</description>
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    <item>
      <title>Should I use .netrc for git authentication</title>
      <link>https://jackliusr.github.io/posts/2024/03/should-i-use-.netrc-for-git-authentication/</link>
      <pubDate>Sat, 09 Mar 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/03/should-i-use-.netrc-for-git-authentication/</guid>
      <description>I used .netrc in several projects and I wrote something about that. I thought it is a convenient way for git until recently.
 Recently I have a new laptop and want to setup my git credentials. This time, I noticed .netrc might not be secure as other applications that use cURL to make requests to servers defined in your .netrc file will also now be authenticated using these credentials.</description>
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    <item>
      <title>Extract multiple fields at different levels of nesting json using chatgpt and jmespath</title>
      <link>https://jackliusr.github.io/posts/2024/03/extract-multiple-fields-at-different-levels-of-nesting-json-using-chatgpt-and-jmespath/</link>
      <pubDate>Sat, 02 Mar 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/03/extract-multiple-fields-at-different-levels-of-nesting-json-using-chatgpt-and-jmespath/</guid>
      <description>How do you extract multiple fields at different levels of nesting json resources? jsonpath, jq, jmespath or chatgpt?
 In FHIR, bundle resource in json format usually have multiple level of details nested in json. It’s quite different from other use cases.
 My first thought is using jsonpath as it is quite similar to FHIRPath. There are several limitations of jsonpath which make it infeasible.
  It doesn’t support to the use case, even though JsonPath supports deep scan and Bracket-notated child or children.</description>
    </item>
    
    <item>
      <title>Custom verbs or operations in REST API</title>
      <link>https://jackliusr.github.io/posts/2024/02/custom-verbs-or-operations-in-rest-api/</link>
      <pubDate>Tue, 20 Feb 2024 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/02/custom-verbs-or-operations-in-rest-api/</guid>
      <description>Standard REST API has limited verbs if using http verbs. However in reality and many business contexts, they are not enough. In the past, many options are proposed. Today I found another option in FHIR. It might be helful to put them here for comparison.
 Control data in request In stackoverflow What to do when you need more verbs in REST, cheeso gave the answer below. It is like the way json-rpc, not well-specified version.</description>
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    <item>
      <title>Extract multiple field and values from a json file fetched once in powerquery</title>
      <link>https://jackliusr.github.io/posts/2024/02/extract-multiple-field-and-values-from-a-json-file-fetched-once-in-powerquery/</link>
      <pubDate>Wed, 14 Feb 2024 23:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/02/extract-multiple-field-and-values-from-a-json-file-fetched-once-in-powerquery/</guid>
      <description>I learnt to extract npm package inform from https://registry.npmjs.org/ on 2023-08-31. Today I have more packages. The original query need to be optimized for better performance.
 In the old post, one can quickly spot that the package information is fetched twice. It is the place to optimize today. I will put selected fields into a column, and extract values from the column later. This way, It can spend less time.</description>
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    <item>
      <title>mount configmap as volume with ini files</title>
      <link>https://jackliusr.github.io/posts/2024/02/mount-configmap-as-volume-with-ini-files/</link>
      <pubDate>Mon, 05 Feb 2024 20:51:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/02/mount-configmap-as-volume-with-ini-files/</guid>
      <description>Today I spent about 1 hours in the task Deploy Lamp Stack on Kubernetes Cluster - Task. This task deepen my understanding of ini file handling and volume mounting with subpath. I think there are 2 tricky parts make the task interesting.
 First, the similarity between --from-literal=variables_order=EGPCS and variables_order = &amp;#34;EGPCS&amp;#34; in php.ini make one try to create a configmap at first. However it is not the case. the actual volumemount will mount each key as a file</description>
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    <item>
      <title>My journey to CKA and CKS</title>
      <link>https://jackliusr.github.io/posts/2024/01/my-journey-to-cka-and-cks/</link>
      <pubDate>Sun, 28 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/my-journey-to-cka-and-cks/</guid>
      <description>Today I got certified as Certified Kubernetes Security Specialist (CKS). It marks a milestone in my mastery of kubernetes after a long journey. It is a good time to reflect on lessons what I learnt.
 My experiences with kubernetes from 2018. I have a habit of comparing other optiosn before making my decisions. Before 2018, I used vagrant and other configuration management tools (puppet, chef, ansible) to setup my lab environments.</description>
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    <item>
      <title>Issues and corresponding solutions of dotnet razor</title>
      <link>https://jackliusr.github.io/posts/2024/01/issues-and-corresponding-solutions-of-dotnet-razor/</link>
      <pubDate>Thu, 25 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/issues-and-corresponding-solutions-of-dotnet-razor/</guid>
      <description>Seperate view dll issues Put views (cshtml) into the main web project
   &amp;#39;RazorTargetAssemblyInfo.cs&amp;#39; could not be found GenerateAssemblyVersionAttribute is set to true : af file MyProject.RazorTargetAssemblyInfo.cs is generated
 &amp;lt;Project Sdk=&amp;#34;Microsoft.NET.Sdk.Razor&amp;#34;&amp;gt; &amp;lt;PropertyGroup&amp;gt; &amp;lt;TargetFramework&amp;gt;netcoreapp3.1&amp;lt;/TargetFramework&amp;gt; &amp;lt;GenerateAssemblyVersionAttribute&amp;gt;true&amp;lt;/GenerateAssemblyVersionAttribute&amp;gt; &amp;lt;/PropertyGroup&amp;gt;   https://github.com/dotnet/aspnetcore/issues/37795#issue-1034241118
   The namespace &amp;#39;Razor&amp;#39; already contains a definition for &amp;#39;Template&amp;#39; https://stackoverflow.com/a/58140724/1101691
   Duplicate &amp;#39;Microsoft.AspNetCore.Razor.Hosting.RazorLanguageVersionAttribute&amp;#39; attribute   How to decompile/extract(cshtml--(razor view)) from dll https://stackoverflow.com/a/69951824/1101691
   </description>
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    <item>
      <title>Restore a project collections of azure devops to another instance</title>
      <link>https://jackliusr.github.io/posts/2024/01/restore-a-project-collections-of-azure-devops-to-another-instance/</link>
      <pubDate>Thu, 25 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/restore-a-project-collections-of-azure-devops-to-another-instance/</guid>
      <description>I spent almost a whole afternoon today to restore a project collections . It doesn’t go well. Azure devops server might supports SQL Server express version. and I choose the wrong way to do that. After several trial, I figure out the way to restore a project collections of azure devops to another instance. The steps is as following.
  install sql server (not sure if sql server express is compatible)</description>
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    <item>
      <title>decompling dotnet assemblies</title>
      <link>https://jackliusr.github.io/posts/2024/01/decompling-dotnet-assemblies/</link>
      <pubDate>Mon, 22 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/decompling-dotnet-assemblies/</guid>
      <description>I used dotpeek for a while to decompile dotnet assembly. Only yesterday I finally found a way to export project from dotnet assembly. The picture below is the menu to do that in dotpeek. However the version I used doesn’t perfectly decompile lambda expression. The decompiled code of lambda expressions are very hard to understand.
      Ilspy is one of decompiler that can decompile lambda in a understandble way.</description>
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    <item>
      <title>CKS/CKA tips</title>
      <link>https://jackliusr.github.io/posts/2024/01/cks/cka-tips/</link>
      <pubDate>Mon, 15 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/cks/cka-tips/</guid>
      <description>The fastest way to get nodes Many times, I run &amp;#34;kubectl get nodes&amp;#34; to get nodes I need to connect to make changes. In the question description section of tasks, master nodes and worker nodes are given. I think the fastest way to get nodes and I wasted some time on getting that info from commands.
   Get events Now kubectl has events command. The events command has intuitive options and less keystokes.</description>
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    <item>
      <title>Export svg from plantuml plugins of vscode and preview svg</title>
      <link>https://jackliusr.github.io/posts/2024/01/export-svg-from-plantuml-plugins-of-vscode-and-preview-svg/</link>
      <pubDate>Mon, 15 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/export-svg-from-plantuml-plugins-of-vscode-and-preview-svg/</guid>
      <description>Clicking the copy button of plantuml plugins of vscode, one can get png from plantuml files. however png files look blurry when even slightly resized. Is there any better way to avoid that ?
 SVG is a good option. Plantuml provides the option to export as svg. It might be troublesome to get a svg file by several steps using it. It is also slow. Is there any other better options?</description>
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    <item>
      <title>Export resources and reconstruct resources in azure</title>
      <link>https://jackliusr.github.io/posts/2024/01/export-resources-and-reconstruct-resources-in-azure/</link>
      <pubDate>Fri, 05 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/export-resources-and-reconstruct-resources-in-azure/</guid>
      <description>My credit of Visual Studio Professional Subscription azure is $50. In the past two days, I activated my subscription. I didn’t go IaC way to setup my POC environment as I did’t have enough time to do that. After I setup more services, the 10 credit is used. It can be quickly used up if resources are kept running. I know there is a way to import existing resources as I used terraform in the past.</description>
    </item>
    
    <item>
      <title>Run anki in wsl2&#43;ubuntu 22.04 </title>
      <link>https://jackliusr.github.io/posts/2024/01/run-anki-in-wsl2-ubuntu-22.04/</link>
      <pubDate>Fri, 05 Jan 2024 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2024/01/run-anki-in-wsl2-ubuntu-22.04/</guid>
      <description>I daily use anki to review things. However I have issues to run it in wsl2+ubuntu 22.04 environment. The only solution for me is below.
 The workable version is 2.1.66 Qt5 with the following environment variable
 export QTWEBENGINE_CHROMIUM_FLAGS=&amp;#34;--disable-seccomp-filter-sandbox&amp;#34;   </description>
    </item>
    
    <item>
      <title>Install selinux and disable it</title>
      <link>https://jackliusr.github.io/posts/2023/12/install-selinux-and-disable-it/</link>
      <pubDate>Fri, 22 Dec 2023 19:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/12/install-selinux-and-disable-it/</guid>
      <description>After thrice attempts, I finally successfully completed the task Selinux Installation at https://engineer.kodekloud.com/practice. Since it is not straightforward, I posted here.
 &amp;gt; sudo yum install -y selinux* &amp;gt; # SELINUX=disabled &amp;gt; # change SELINUX in /etc/selinux/config &amp;gt; cat /etc/selinux/config | grep SELINUX # SELINUX= can take one of these three values: SELINUX=disabled # SELINUXTYPE= can take one of three values: SELINUXTYPE=targeted   </description>
    </item>
    
    <item>
      <title>Ways to improve performance within budget constraints</title>
      <link>https://jackliusr.github.io/posts/2023/11/ways-to-improve-performance-within-budget-constraints/</link>
      <pubDate>Wed, 29 Nov 2023 19:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/ways-to-improve-performance-within-budget-constraints/</guid>
      <description>Say in a situtation where budget is fixed, what will you do to improve system performance?
 I came out several solutions to this at first, later I came out with more thoughts. I list them here for later reference.
  create selective indexes
  partition tables
  materialized view
  asynchrous processing: put non real-time operations as a job queue, spread jobs to non business hours, non peak loading time etc.</description>
    </item>
    
    <item>
      <title>error handling in api idempotency: timeout and retry </title>
      <link>https://jackliusr.github.io/posts/2023/11/error-handling-in-api-idempotency-timeout-and-retry/</link>
      <pubDate>Thu, 23 Nov 2023 19:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/error-handling-in-api-idempotency-timeout-and-retry/</guid>
      <description>In stripe doc, Stripe explain how it works as following quoted contet. Other places only mentions that the processes will be only once.
 Stripe&amp;#39;s idempotency works by saving the resulting status code and body of the first request made for any given idempotency key, regardless of whether it succeeded or failed. Subsequent requests with the same key return the same result, including 500 errors.   Then there is an interesting question how to handle timeout and retry cases?</description>
    </item>
    
    <item>
      <title>API idempotency</title>
      <link>https://jackliusr.github.io/posts/2023/11/api-idempotency/</link>
      <pubDate>Wed, 22 Nov 2023 19:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/api-idempotency/</guid>
      <description>I leant API idempotency many years ago when I worked in Asia Fusion Technologies. At that time, I was involved in integration with payment systems and games from different vendor. That gave me a chance to read a lot of API documents and evalute them. During that time, one interesting characteristic of API got my attention. It is API idempotency. That time, there is no much information of idempotency how to implement etc.</description>
    </item>
    
    <item>
      <title>My tilt asciinema cast</title>
      <link>https://jackliusr.github.io/posts/2023/11/my-tilt-asciinema-cast/</link>
      <pubDate>Wed, 22 Nov 2023 09:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/my-tilt-asciinema-cast/</guid>
      <description>Today I read agones site and noticed it play asciinema cast in its home page. I wondered if I can put my asciinema cast into my blog. Here is my one.
    AsciinemaPlayer.create(&#39;/casts/497308.cast&#39;, document.getElementById(&#39;497308&#39;), { });   The cast is about how to use titl for local micro-service development based on kubernetes.
 </description>
    </item>
    
    <item>
      <title>Kubernetes while redirection into a file </title>
      <link>https://jackliusr.github.io/posts/2023/11/kubernetes-while-redirection-into-a-file/</link>
      <pubDate>Mon, 20 Nov 2023 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/kubernetes-while-redirection-into-a-file/</guid>
      <description>My first attemp to resolve &amp;#34;Kubernetes Time Check Pod&amp;#34; in https://engineer.kodekloud.com is not successful. The exercise doesn’t allow to open an editor to edit a yaml file. I had to resort to cat. I attempted several times to resolve it on my local cluster, still no luck even I tried different combination such as command, args,string in string, avoiding expansion. This one from stackoverfow gave me a clue how to resolve my issue.</description>
    </item>
    
    <item>
      <title>Faster way to restart static pods after configuraiton changes</title>
      <link>https://jackliusr.github.io/posts/2023/11/faster-way-to-restart-static-pods-after-configuraiton-changes/</link>
      <pubDate>Mon, 20 Nov 2023 12:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/faster-way-to-restart-static-pods-after-configuraiton-changes/</guid>
      <description>In the past several days, I practiced several exercises for my coming CKS exam. I noticed that it takes a while to get static pods restart after configuraiton changes. I was curious if there is any faster way to make that happen. I think the following ways definitely will be faster than waiting 3 minutes after I used them for a while. The observable time is shorter than 3 minutes</description>
    </item>
    
    <item>
      <title>Convert statistics information columns to rows in sql</title>
      <link>https://jackliusr.github.io/posts/2023/11/convert-statistics-information-columns-to-rows-in-sql/</link>
      <pubDate>Wed, 08 Nov 2023 08:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/convert-statistics-information-columns-to-rows-in-sql/</guid>
      <description>I encountered an issue how to get detailed information based on statistics information such as minimum and maximum values in a dataset. The traditional way might be use case expression,coalese functions etc to archive the goals, However I felt it is quite clumsy.
 How do it in a neat way? In SQL standard, there is a way using unpivot to transform columns to rows. It is a good fit for this situation to get a neat SQL statement to resolve the issue.</description>
    </item>
    
    <item>
      <title>Resolve the error that The Pod xxx is invalid: spec.containers[0].volumeMounts[1].name: Not found</title>
      <link>https://jackliusr.github.io/posts/2023/11/resolve-the-error-that-the-pod-xxx-is-invalid-spec.containers0.volumemounts1.name-not-found/</link>
      <pubDate>Sun, 05 Nov 2023 14:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/11/resolve-the-error-that-the-pod-xxx-is-invalid-spec.containers0.volumemounts1.name-not-found/</guid>
      <description>I encountered the issue yesterday during my exercise in killer CKA similator. However I made the same mistakes again. I think it worth to write it down to avoid I make the same mistake again.
 In my day to day works, I usually add volumes before containers in the spec section of pods. In exams, sometimes I need to add extra volumes into a existing pod extracted from a running pod, and I still add volumes in the old way.</description>
    </item>
    
    <item>
      <title>Beyond High Availability: The Importance of FMEA in Ensuring Uninterrupted Operations</title>
      <link>https://jackliusr.github.io/posts/2023/10/beyond-high-availability-the-importance-of-fmea-in-ensuring-uninterrupted-operations/</link>
      <pubDate>Mon, 23 Oct 2023 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/10/beyond-high-availability-the-importance-of-fmea-in-ensuring-uninterrupted-operations/</guid>
      <description>Beyond High Availability: The Importance of FMEA in Ensuring Uninterrupted Operations
 Introduction
 In an increasingly interconnected and data-driven world, high availability is a critical component for any system or infrastructure. High availability ensures that a system can continue to operate and deliver its services, even in the face of hardware failures, software glitches, or other unforeseen disruptions. However, high availability alone is not enough to guarantee uninterrupted operations. To achieve true resilience, it’s essential to complement high availability with a proactive approach to risk assessment and mitigation.</description>
    </item>
    
    <item>
      <title>Skip first line before running xargs</title>
      <link>https://jackliusr.github.io/posts/2023/10/skip-first-line-before-running-xargs/</link>
      <pubDate>Fri, 06 Oct 2023 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/10/skip-first-line-before-running-xargs/</guid>
      <description>Do you know how to skip first line before data pipe into xargs?
 Today I need to export custom resources and want to avoid error messages because the column names line in the output of kubectl. I knew there is a command line option (--no-headers) of kubectl and managed to get the option, but I don’t want to spend time to search the option in future. Is there any way to skip first line before data pipe into xargs?</description>
    </item>
    
    <item>
      <title>Change appsettings.json without restart in app service</title>
      <link>https://jackliusr.github.io/posts/2023/10/change-appsettings.json-without-restart-in-app-service/</link>
      <pubDate>Thu, 05 Oct 2023 20:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/10/change-appsettings.json-without-restart-in-app-service/</guid>
      <description>Nowadays, zero downtime is normal, you can’t believe that in azure app service changes in &amp;#34;app settings&amp;#34;, App Service triggers an app restart. The alternative ways to do avoid that is to use sentinel key with App Configuration. however App Configuration will cost a little. Do we really need to use App Configuration to achieve that ?
 The naive and obvious way is that changing appsettings.json files via entering the app services using kudo console.</description>
    </item>
    
    <item>
      <title>Get information from internet in excel, custom function vs powerquery</title>
      <link>https://jackliusr.github.io/posts/2023/08/get-information-from-internet-in-excel-custom-function-vs-powerquery/</link>
      <pubDate>Thu, 31 Aug 2023 00:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/08/get-information-from-internet-in-excel-custom-function-vs-powerquery/</guid>
      <description>Last week I worked on filling info package information to a workbooks. I used VBA macro before and thought of it again to save some of my time.
 Things is changing very fast, the new javascript based custom fuction is the mainstream. The initial one I followed the tutorial, however I didn’t find any way to add it into &amp;#34;My Addin&amp;#34; as described in microsoft doc site. I don’t have administrator rights on my laptop.</description>
    </item>
    
    <item>
      <title>Generate a customized rule of spectral using chatgpt</title>
      <link>https://jackliusr.github.io/posts/2023/08/generate-a-customized-rule-of-spectral-using-chatgpt/</link>
      <pubDate>Thu, 17 Aug 2023 00:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/08/generate-a-customized-rule-of-spectral-using-chatgpt/</guid>
      <description>Background I didn’t find a rule implementation of spectral at stoplightio and github to lint the rule that resources should be nouns in REST API. stoplight mentions that Use Nouns for Resource Names, however there is no another article about that. I was bothered by that for a while to the point I want to give it a try to implement my rule for that.
 There are several existing implementations about this rule.</description>
    </item>
    
    <item>
      <title>Scaffold Identity into an MVC project without existing authorization</title>
      <link>https://jackliusr.github.io/posts/2023/07/scaffold-identity-into-an-mvc-project-without-existing-authorization/</link>
      <pubDate>Sun, 30 Jul 2023 20:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/07/scaffold-identity-into-an-mvc-project-without-existing-authorization/</guid>
      <description>Today I tried to integrate identity into mvc projects. The main doc about this is at https://learn.microsoft.com/en-us/aspnet/core/security/authentication/scaffold-identity?view=aspnetcore-7.0&amp;amp;tabs=netcore-cli#scaffold-identity-into-an-mvc-project-without-existing-authorization
 dotnet add package Microsoft.VisualStudio.Web.CodeGeneration.Design dotnet add package Microsoft.EntityFrameworkCore.Design dotnet add package Microsoft.AspNetCore.Identity.EntityFrameworkCore dotnet add package Microsoft.AspNetCore.Identity.UI dotnet add package Microsoft.EntityFrameworkCore.Tools # add second dbcontext for identity and authorinization, use database sqlite dotnet aspnet-codegenerator identity -dc MyApplication.Data.ApplicationDbContext \ --files &amp;#34;Account.Register;Account.Login&amp;#34; --databaseProvider sqlite dotnet ef migrations add CreateIdentitySchema \ --context MyApplication.Data.ApplicationDbContext dotnet ef database update \ --context MyApplication.</description>
    </item>
    
    <item>
      <title>Kubernetes beyond 5k nodes etcd-sharding</title>
      <link>https://jackliusr.github.io/posts/2023/07/kubernetes-beyond-5k-nodes-etcd-sharding/</link>
      <pubDate>Sun, 23 Jul 2023 00:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/07/kubernetes-beyond-5k-nodes-etcd-sharding/</guid>
      <description>Background I was once asked how to run big scaled kubernetes clusters regarding etcd size limitation. For example how to handle 8G limitations. I was not satisfied with my answers such as increasing memory, compaction &amp;amp; defragmentation as I knew there were several big scale clusters in several companies and 8GB might be a hard limit. However I didn’t have any clues how they make that happened.
 Since then, I kept tabs on etcd by reading etcd community meeting (Public).</description>
    </item>
    
    <item>
      <title>Exploring Dapr-Introduction, Experiences, and Live Demo</title>
      <link>https://jackliusr.github.io/posts/2023/07/exploring-dapr-introduction-experiences-and-live-demo/</link>
      <pubDate>Thu, 20 Jul 2023 20:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/07/exploring-dapr-introduction-experiences-and-live-demo/</guid>
      <description>I was very excited to be invited to give a talk about dapr. Below is my talk. My demo in the session is not successful as things in kubernetes and dapr field are changing very fast. My lab environment didn’t work as expected. Finially I make it work today, I share it here below.
 Here is my talk at 18th July from time 2235 in below video.
    Prerequisites kubectl, kind, docker, dapr, git, vscode in WSL</description>
    </item>
    
    <item>
      <title>Charge Back business process</title>
      <link>https://jackliusr.github.io/posts/2023/06/charge-back-business-process/</link>
      <pubDate>Mon, 26 Jun 2023 19:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/06/charge-back-business-process/</guid>
      <description>A typical steps involved in the issuer response process for a card authorization, a simplified description is as following.
  Receive Authorization Request: The card issuer system receives the authorization request from the merchant or payment processor.
  Card Validation: The issuer system validates the card details provided in the request, including the card number, expiration date, and CVV/CVC.
  Account Verification: The issuer system verifies the cardholder’s account details, such as account status, available funds, and credit limit (if applicable).</description>
    </item>
    
    <item>
      <title>Charge Back business process</title>
      <link>https://jackliusr.github.io/notes/finance/charge-back/</link>
      <pubDate>Mon, 26 Jun 2023 09:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/finance/charge-back/</guid>
      <description>charge backSend Authorization RequestMerchant HandlingReceive Authorization RequestCard ValidationAccount VerificationFraud DetectionDecision MakingGenerate Authorization ResponseSend Authorization Responsemerchant/payment processorcard issuer system   </description>
    </item>
    
    <item>
      <title>Powerpoint vs UML</title>
      <link>https://jackliusr.github.io/posts/2023/06/powerpoint-vs-uml/</link>
      <pubDate>Thu, 08 Jun 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/06/powerpoint-vs-uml/</guid>
      <description>I think I am a big fan of textual UML after I learnt it from thoughtworks techradar. I doubted it after my recent experience.
 In the past 2 months I spent long periods of time to think of how to make my Powerpoint slides pass my boss Lim Chee Kiam&amp;#39;s standard. I thought deeply about that. One moment, I asked myself why Grady Booch, Ivar Jacobson, and James Rumbaugh didn’t come out a diagram which cater to dynamic(behaviour) and static (structure) diagrams, then I realized it will be a mess if those two things are put toghere.</description>
    </item>
    
    <item>
      <title>My choice of personal knowledge management (PKM): logseq</title>
      <link>https://jackliusr.github.io/posts/2023/05/my-choice-of-personal-knowledge-management-pkm-logseq/</link>
      <pubDate>Tue, 23 May 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/05/my-choice-of-personal-knowledge-management-pkm-logseq/</guid>
      <description>I chose logseq as my PKM I was overloaded with information in the past several weeks. I sought many ways to overcome it. One choice I made is using logseq as PKM.
   why? There are several open source or freeware verion of PKM. Why did I choose logseq?
   logseq is clojure based. I am a big fan of lisp-liked languages. I studied and did some coding using racket, common-lisp, elisp and clojure after I read Paul Graham’s essays about lisp.</description>
    </item>
    
    <item>
      <title>Setup docker in wsl2</title>
      <link>https://jackliusr.github.io/posts/2023/05/setup-docker-in-wsl2/</link>
      <pubDate>Tue, 23 May 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/05/setup-docker-in-wsl2/</guid>
      <description>Installation I installed Ubuntu 22.04 on my laptop following the scripts here.
 sudo apt-get update sudo apt-get install ca-certificates curl gnupg sudo install -m 0755 -d /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg sudo chmod a+r /etc/apt/keyrings/docker.gpg echo \ &amp;#34;deb [arch=&amp;#34;$(dpkg --print-architecture)&amp;#34; signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \ &amp;#34;$(. /etc/os-release &amp;amp;&amp;amp; echo &amp;#34;$VERSION_CODENAME&amp;#34;)&amp;#34; stable&amp;#34; | \ sudo tee /etc/apt/sources.list.d/docker.list &amp;gt; /dev/null sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin service docker start     Troubleshootig It is little different from my previous installation.</description>
    </item>
    
    <item>
      <title>Hash vs UUID to replace NRIC/L4C</title>
      <link>https://jackliusr.github.io/posts/2023/05/hash-vs-uuid-to-replace-nric/l4c/</link>
      <pubDate>Fri, 05 May 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/05/hash-vs-uuid-to-replace-nric/l4c/</guid>
      <description>Item
 Hash/encryption
 UUID
   Order preservation
 possible (linear hash)
 possible ( customized UUID algorithm)
   length
 shorter or longer
 fixed
   ubiquitous
 anyone or machines can be used to hash
 depends
   performance (computing)
 ?
 ?
   performance (search)
 fast
 slow
    References:</description>
    </item>
    
    <item>
      <title>Keep the search result pages in search engines up to date</title>
      <link>https://jackliusr.github.io/posts/2023/05/keep-the-search-result-pages-in-search-engines-up-to-date/</link>
      <pubDate>Fri, 05 May 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/05/keep-the-search-result-pages-in-search-engines-up-to-date/</guid>
      <description>Last week I was assigned a task to keep search result pages of a site of my company up to date. After researching, trial and errors, I found out the following ways to keep the search result pages in search engines up to date.
   Remove outdated content from search result of google and Bing.
  temporary: block URLs from webmaster tools
  permanent:
 get sitemaps.</description>
    </item>
    
    <item>
      <title>linux utils equivalent in powershell</title>
      <link>https://jackliusr.github.io/posts/2023/04/linux-utils-equivalent-in-powershell/</link>
      <pubDate>Fri, 28 Apr 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/04/linux-utils-equivalent-in-powershell/</guid>
      <description>I never thought I will learn to use powershell seriously. Now I joined NTUC, there are many restrictions. Today I started to use linux utils equivalent in powershell.
   dig: Resolve-DnsName
  telnet: Test-NetConnection
  host: Get-Host
  touch: New-Item
  cat: Get-Content
  tail: Get-Content
  grep: Where-Object or Select-String
  man: Get-Help
   References   https://mathieubuisson.github.io/powershell-linux-bash/#pwd- -</description>
    </item>
    
    <item>
      <title>filter data conditionally using power-query</title>
      <link>https://jackliusr.github.io/posts/2023/04/filter-data-conditionally-using-power-query/</link>
      <pubDate>Tue, 25 Apr 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/04/filter-data-conditionally-using-power-query/</guid>
      <description>2 days ago, I didn’t figure out how to filter out data using power-query. I used a workaround solution to achive the same goal. Yesteray I occasionally found that I can filter out data directly without using my workaround solutions.
   Table.SelectRows
Table.SelectRows( Table.FromRecords({ [CustomerID = 1, Name = &amp;#34;Bob&amp;#34;, Phone = &amp;#34;123-4567&amp;#34;], [CustomerID = 2, Name = &amp;#34;Jim&amp;#34;, Phone = &amp;#34;987-6543&amp;#34;], [CustomerID = 3, Name = &amp;#34;Paul&amp;#34;, Phone = &amp;#34;543-7890&amp;#34;], [CustomerID = 4, Name = &amp;#34;Ringo&amp;#34;, Phone = &amp;#34;232-1550&amp;#34;] }), each ( [CustomerID] &amp;gt; 2 and Text.</description>
    </item>
    
    <item>
      <title>Subdomain or path for dev/stage/uat environments</title>
      <link>https://jackliusr.github.io/posts/2023/04/subdomain-or-path-for-dev/stage/uat-environments/</link>
      <pubDate>Thu, 13 Apr 2023 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/04/subdomain-or-path-for-dev/stage/uat-environments/</guid>
      <description>In my previous two companies, everytime I used the subdomain way without thinking much about this. Recently I wondered the rational behind this decisions. I had the clear answers two days ago. Today I have the time to put it into this writing.
     Factors
 subdomain(dev.example.com)
 subdomain reasons
 path (example.com/dev/)
 path reasons
   server side performance
 9
   dns records point to differnent IP.</description>
    </item>
    
    <item>
      <title>Leader election in Kubernetes control plane</title>
      <link>https://jackliusr.github.io/posts/2023/03/leader-election-in-kubernetes-control-plane/</link>
      <pubDate>Fri, 10 Mar 2023 09:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/03/leader-election-in-kubernetes-control-plane/</guid>
      <description>Leader election in Kubernetes control plane - #HeptioProTip give a way how to find out leaders of Kubernetes control plane components kube-scheduler and kube-controller-manager. However it was based on a old version of kubernetes, and the mechanism is changed in later versions. Today I was asked how to find the leaders. Here is the new way to find.
 $ kubectl -n kube-system get lease NAME HOLDER AGE kube-apiserver-c4vwjftbvpc5os2vvzle4qg27a kube-apiserver-c4vwjftbvpc5os2vvzle4qg27a_b187371d-e48c-4216-8228-707a0ecf6100 2m57s kube-apiserver-dz2dqprdpsgnm756t5rnov7yka kube-apiserver-dz2dqprdpsgnm756t5rnov7yka_0b531f66-0c31-453c-9277-a6c1aa81da94 86s kube-apiserver-fyloo45sdenffw2ugwaz3likua kube-apiserver-fyloo45sdenffw2ugwaz3likua_3e322f9a-9724-4e3a-9fc6-a512e9424164 2m11s kube-controller-manager kind-control-plane_bec39b96-87c4-4bce-8775-2eeb4eb4c1e8 2m53s kube-scheduler kind-control-plane_db6f36d8-ceaa-40eb-b821-75f8ae829f22 2m53s $ kubectl -n kube-system get pods -l component=kube-controller-manager,tier=control-plane \ -o custom-columns=NAME:.</description>
    </item>
    
    <item>
      <title>Istio Canary Deployments using flagger</title>
      <link>https://jackliusr.github.io/posts/2023/02/istio-canary-deployments-using-flagger/</link>
      <pubDate>Wed, 22 Feb 2023 09:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/02/istio-canary-deployments-using-flagger/</guid>
      <description>Progressive delivery: Istio Canary Deployments using flagger.
 Steps environment:
   kindest/node:v1.25.3
  Istio 1.17.0
   helm # need to install metrics-server, HPA depends on metrics-server kubectl apply -f https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml # command: # - /metrics-server # - --kubelet-insecure-tls istioctl manifest install --set profile=default kubectl apply -f https://raw.githubusercontent.com/istio/istio/release-1.17/samples/addons/prometheus.yaml helm repo add flagger https://flagger.app kubectl apply -f https://raw.githubusercontent.com/fluxcd/flagger/main/artifacts/flagger/crd.yaml helm upgrade -i flagger flagger/flagger \ --namespace=istio-system \ --set crd.</description>
    </item>
    
    <item>
      <title>Learning experiences among datadog, dynatrace, newrelic</title>
      <link>https://jackliusr.github.io/posts/2023/02/learning-experiences-among-datadog-dynatrace-newrelic/</link>
      <pubDate>Wed, 22 Feb 2023 09:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/02/learning-experiences-among-datadog-dynatrace-newrelic/</guid>
      <description>Last week and this week, I completed my basic learning of APMs as a tool of SRE. I learnt fundamentals of datadog and newrelic, walked through their tutorials in last week and this week. I don’t find a easy way to learn dynatrace from its site. The whole learning experiences between datadog and newrelic are on par with each other. What’s the deal breaker when making choices among them?
 Leader     Feature flags intergration During a discussion about progressive delivery using flagger, I was curious if it is possible to integrate feature flags and APM.</description>
    </item>
    
    <item>
      <title>The First 90 Days: Proven Strategies for Getting Up to Speed Faster and Smarter, Updated and Expanded</title>
      <link>https://jackliusr.github.io/notes/the_90_days/</link>
      <pubDate>Wed, 15 Feb 2023 20:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/the_90_days/</guid>
      <description>Preface accelerate onboarding of new hires and transition. follow-on publications. other ideas
   the STARS framework,
  transition traps,
  the importance of securing early wins
  the fuzzy front-end
  distinction between the organizational change challenge and the personal adaptive challenge in assessing the transition risk confronting new leaders.
   other publications:
   Shaping the Game, 2006
  The First 90 Days in Government</description>
    </item>
    
    <item>
      <title>kubernetes On-premise</title>
      <link>https://jackliusr.github.io/notes/kubernetes-on-premises/</link>
      <pubDate>Fri, 10 Feb 2023 21:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/kubernetes-on-premises/</guid>
      <description>It is a big topic to setup kubernetes correctly. I will keep updating this when I find something new or missed in this.
 </description>
    </item>
    
    <item>
      <title>What&#39;s pod sandbox</title>
      <link>https://jackliusr.github.io/posts/2023/02/whats-pod-sandbox/</link>
      <pubDate>Fri, 10 Feb 2023 09:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/02/whats-pod-sandbox/</guid>
      <description>The explanation of pod sandbox at the abstraction that replaces the &amp;#34;pause&amp;#34; container that is used to keep namespaces open in every Kubernetes pod today. I doubted about that. What’s the point to introduce a new concept? Yerterday I went down the rabbit hole to understand it. This morning I finally got the hang of it.
 Kubernetes blog said it is an environment. It maybe a VM, a group of containers.</description>
    </item>
    
    <item>
      <title>Kubelet architecture</title>
      <link>https://jackliusr.github.io/notes/kubelet/</link>
      <pubDate>Thu, 09 Feb 2023 09:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/kubelet/</guid>
      <description>In the past I learnt a lot of kubernetes, however there is no much information about kubelet or not deep enough. I couldn’t answer the questions about kubelet correctly in an interview. Here I put all the information I collected from the internet here for my references.
 kubelet component architecture     how does kubelet work     Container Lifecycle Management Through the CRI        kubelet, CRI and CNI sequence diagram        kubelet, CRI and CNI interaction diagram        The process of creating a pod Handler    The work of podWorkers    syncPod kubelet    Runtime    Creating a sandbox for a pod       References:   https://www.</description>
    </item>
    
    <item>
      <title>kubernetes metrics options</title>
      <link>https://jackliusr.github.io/notes/k8s-metrics/</link>
      <pubDate>Thu, 09 Feb 2023 09:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/k8s-metrics/</guid>
      <description>Components
 Description
 Metrics
 Scaler
   Metrics Server
 Metrics Server collects resource metrics from Kubelets and exposes them in Kubernetes apiserver through Metrics API for use by Horizontal Pod Autoscaler and Vertical Pod Autoscaler. Metrics API can also be accessed by kubectl top, making it easier to debug autoscaling pipelines.
 Metrics Server is not meant for non-autoscaling purposes
 CPU/Memory</description>
    </item>
    
    <item>
      <title>github, action-runner, argo-cd: my cicd pipelines</title>
      <link>https://jackliusr.github.io/posts/2023/02/github-action-runner-argo-cd-my-cicd-pipelines/</link>
      <pubDate>Wed, 01 Feb 2023 17:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/02/github-action-runner-argo-cd-my-cicd-pipelines/</guid>
      <description>Usually I explain one of my CICD pipeline to others with words such like github action + argo-cd. I am not sure if they understand it. A picture is worth a thousand words. Here is my CICD pipeline picture.
      I used excalidraw to draw the diagram. Excalidraw link is https://excalidraw.com/#json=zJHTTZ_QgcarkYCCankS8,gotb3rzXtE8ux810NoK18A. Feel free to use it.
 </description>
    </item>
    
    <item>
      <title>An Elegant Puzzle: Systems of Engineering Management</title>
      <link>https://jackliusr.github.io/notes/an-elegant-puzzle/</link>
      <pubDate>Mon, 30 Jan 2023 00:01:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/an-elegant-puzzle/</guid>
      <description>Organizations   Tools   Approaches   Culture   Careers   </description>
    </item>
    
    <item>
      <title>books I read</title>
      <link>https://jackliusr.github.io/readinglists/</link>
      <pubDate>Sun, 29 Jan 2023 12:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/readinglists/</guid>
      <description>Technology  Beginning Bazel: Building and Testing for Java, Go, and More
     Management  The Manager’s Path: A Guide for Tech Leaders Navigating Growth and Change
  How Google Works
     Investment  The Little Book of Valuation: How to Value a Company, Pick a Stock and Profit 1st Edition
  Investment Valuation: Tools and Techniques for Determining the Value of Any Asset</description>
    </item>
    
    <item>
      <title>How many years of experience do I have on aws services now?</title>
      <link>https://jackliusr.github.io/posts/2023/01/how-many-years-of-experience-do-i-have-on-aws-services-now/</link>
      <pubDate>Sat, 28 Jan 2023 10:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/how-many-years-of-experience-do-i-have-on-aws-services-now/</guid>
      <description>Usually I tell others that I have about 5 years experience of aws services. Today I want to know more about how many years experience I have. I logged in my aws account and tried to find my account creation date. There is no such information in account page. I was so eager to find the information and searched for alternative way to get that information. The easiest way is good one, however I already deleted the email.</description>
    </item>
    
    <item>
      <title>2023 SWOT Analysis</title>
      <link>https://jackliusr.github.io/posts/2023/01/2023-swot-analysis/</link>
      <pubDate>Wed, 25 Jan 2023 22:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/2023-swot-analysis/</guid>
      <description>Once I read an article about how to apply SWOT Analysis for personal career and strategies to in career development. The article most likely is Personal SWOT Analysis as I read a lot of articles from mindtools.com.
 When I read the article, I also found several strategies how to convert my weakness to strengths. I finally converted one of my weakness — English to one of my strengths in the past 5 years by keeping learning and practicing English.</description>
    </item>
    
    <item>
      <title>2023 resolution</title>
      <link>https://jackliusr.github.io/posts/2023/01/2023-resolution/</link>
      <pubDate>Sat, 21 Jan 2023 22:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/2023-resolution/</guid>
      <description>Today it is Chinese New Year’s Eve of 2023. I like to make my new resolutions in Chinese New Year. Reflecting on the past year will help me to make better resolution. Even I made decision to learn and practice several things, however I didn’t write down last year. It was not helpful for me to make reflection based past experiences.
 My resolution of 2022 were as following:
  improve my English communication to fluent level.</description>
    </item>
    
    <item>
      <title>cloud migrations, cloud differences</title>
      <link>https://jackliusr.github.io/posts/2023/01/cloud-migrations-cloud-differences/</link>
      <pubDate>Tue, 17 Jan 2023 22:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/cloud-migrations-cloud-differences/</guid>
      <description>AWS has almost established themselves as the de facto public cloud provider for a lot of businesses, other providers always try to provide similiar services and similar APIs to attract existing AWS customers to migrate to their platform. Each following provider provides similar comparison table comparing to AWS. Those comparison can give one a quick start to adopt their services without major issues. Even those following providers provide migration tools for migrating from aws to their platform.</description>
    </item>
    
    <item>
      <title>The Manager&#39;s Path: A Guide for Tech Leaders Navigating Growth and Change</title>
      <link>https://jackliusr.github.io/notes/the-manager-path/</link>
      <pubDate>Tue, 17 Jan 2023 11:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/the-manager-path/</guid>
      <description>Chapter 1: Management 101  what to expect from a manager
 1:1 meeting, every few weeks with direct/line manager; two purposes
 create human connections
  status update: regular
     feedback and workspace guidance: frequest, fast, many wasy
 quick feedbackup loop is more efficient
  public praise, private critism
  feedback type: code, presentation
 code, content, layout, style …​
     role</description>
    </item>
    
    <item>
      <title>Leadership book reading 1 </title>
      <link>https://jackliusr.github.io/posts/2023/01/leadership-book-reading-1/</link>
      <pubDate>Mon, 16 Jan 2023 22:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/leadership-book-reading-1/</guid>
      <description>Long ago, I wanted to learn something about technology leaderships, however I didn’t know how to do it. One or two months ago I found Will Larson’s book &amp;#34;An Elegant Puzzle: Systems of Engineering Management&amp;#34; which recommended by others and today I found another books Best Books for Leaders in Tech: theWaydev Selection. It’s time to put the ideas into action since I already completed a big milestone of learning English.</description>
    </item>
    
    <item>
      <title>Reduce the chance of resource conflict in gitops</title>
      <link>https://jackliusr.github.io/posts/2023/01/reduce-the-chance-of-resource-conflict-in-gitops/</link>
      <pubDate>Fri, 13 Jan 2023 22:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/reduce-the-chance-of-resource-conflict-in-gitops/</guid>
      <description>Summary: Reduce the chance of resource conflict in gitops by reducing the time window of using shared resource files
 My initial journal with gitops was setup my gitops cicd pipeline following the flux tutorial way. I immediately found out the limitation of flux at that time and sought alternative solutions. After comparing different solutions, I settled down argo-cd.
 After a short while usage of argo-cd, I moved configration yamls and kustomization.</description>
    </item>
    
    <item>
      <title>Playbook: etcd debugging</title>
      <link>https://jackliusr.github.io/posts/2023/01/playbook-etcd-debugging/</link>
      <pubDate>Mon, 09 Jan 2023 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/playbook-etcd-debugging/</guid>
      <description>etcd debugging flowchart, copy the flowchat from &amp;ldquo;Stories from the Playbook&amp;rdquo; for easy reference and put here to make it searchable in my site.
flowchart TD oversized{MVCC DB oversized}--|Yes|logIntoContainer(log into container) logIntoContainer -- checkSize(check size of db) checkSize -- compatOrDefrag(compat or defrag) compatOrDefrag -- resizeDisk(resize machine disk) resizeDisk -- triggerRepair(Trigger repair) triggerRepair -- END oversized --|No|crashLoop{crash looping} crashLoop --|Yes| moreTime2Init(allow etc more time to init) moreTime2Init -- upgradeVersion(upgrade version) upgradeVersion -- resizeDisk crashLoop --|No| leaderElectionIssue{Leader Election Issue?</description>
    </item>
    
    <item>
      <title>Lessons learnt after two years usage of cert-manager</title>
      <link>https://jackliusr.github.io/posts/2023/01/lessons-learnt-after-two-years-usage-of-cert-manager/</link>
      <pubDate>Thu, 05 Jan 2023 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/lessons-learnt-after-two-years-usage-of-cert-manager/</guid>
      <description>Yesterday I spent one or two hours to resolve a pending order issue. I encountered the issue before when I configured cert-manager with ACME. However after a short while detour to flutter(ios,android) development, I couldn’t quickly locate the root causes. This made me think that it is better off to note down the lessons I leant here.
 DNS01 vs HTTP01 HTTP01 is quite easy to setup for one domain name.</description>
    </item>
    
    <item>
      <title>working solution: locale change using device_preview and GetMaterialApp.router</title>
      <link>https://jackliusr.github.io/posts/2023/01/working-solution-locale-change-using-device_preview-and-getmaterialapp.router/</link>
      <pubDate>Tue, 03 Jan 2023 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2023/01/working-solution-locale-change-using-device_preview-and-getmaterialapp.router/</guid>
      <description>I can make it works when using device_preview and getx GetMaterialApp. GetMaterialApp can perfectly works with device_preview on many things such as size, orientation etc. GetMaterialApp.router is not the case. I found that locale changes in device_preview can’t propagate to GetMaterialApp.router.
 I raised a issue, however getx has a bad reputation on fixing issues. I can’t wait so long and I sought other options. Things I tried was to use GetMaterialApp, however always to get several errors.</description>
    </item>
    
    <item>
      <title>Terraform advantages over cloudformation or ARM tempaltes</title>
      <link>https://jackliusr.github.io/posts/2022/12/terraform-advantages-over-cloudformation-or-arm-tempaltes/</link>
      <pubDate>Sat, 31 Dec 2022 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/terraform-advantages-over-cloudformation-or-arm-tempaltes/</guid>
      <description>Terraform site gives several use cases and comparison with other IaC langauges. I think there are few things of terraform that stand out when comparing it with other tools such as cloudformation, ARM tempaltes IaC languages.
 multi-cloud deployment When you only use one cloud-provider’s solution to do IaC and things get in your way, you will have hard time to migrate to other providers as you already invested heavily into one provider.</description>
    </item>
    
    <item>
      <title>Integrate device_preview, bot_toast and getx</title>
      <link>https://jackliusr.github.io/posts/2022/12/integrate-device_preview-bot_toast-and-getx/</link>
      <pubDate>Thu, 29 Dec 2022 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/integrate-device_preview-bot_toast-and-getx/</guid>
      <description>void main() =&amp;gt; runApp( DevicePreview( enabled: !kReleaseMode, builder: (context) =&amp;gt; MyApp(), // Wrap your app ), ); class MyApp extends StatelessWidget { final botToastBuilder = BotToastInit(); @override Widget build(BuildContext context) { return GetMaterialApp.router( useInheritedMediaQuery: true, locale: DevicePreview.locale(context), builder: (context, child) { child = DevicePreview.appBuilder(context, child); child = botToastBuilder(context, child); return child; }, theme: ThemeData.light(), darkTheme: ThemeData.dark(), home: const HomePage(), ); } }   Reference:   https://pub.dev/packages/bot_toast
  https://stackoverflow.</description>
    </item>
    
    <item>
      <title>Spring devtools in action</title>
      <link>https://jackliusr.github.io/posts/2022/12/spring-devtools-in-action/</link>
      <pubDate>Thu, 22 Dec 2022 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/spring-devtools-in-action/</guid>
      <description>I thought it was every easy to setup and use it using STS and gradle. The actual story is not so. I changed my settings followed Developing with Spring Boot and some suggestions here in stackoverflow, however liveload and autorestart don’t work.
 After several rounds of trial, I noticed spring boot dashboard. I start my application from there, liveload and autorestart work now.
      developmentOnly(&amp;#34;org.</description>
    </item>
    
    <item>
      <title>some packages cannot be resolved in eclipse with gradle projects</title>
      <link>https://jackliusr.github.io/posts/2022/12/some-packages-cannot-be-resolved-in-eclipse-with-gradle-projects/</link>
      <pubDate>Sun, 18 Dec 2022 13:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/some-packages-cannot-be-resolved-in-eclipse-with-gradle-projects/</guid>
      <description>In the past two days, I always got the errors &amp;#34;packages cannot be resolved&amp;#34; in eclipse with gradle projects. Initial I encountered the issue, I desperately wanted to resolved the issue. I tried several ways to do that by using solutions from web, however I didn’t get my issue resolved. Due to time constraint, I went back to the old mvn way to do the project. Today I have sometime to revisit the issue now.</description>
    </item>
    
    <item>
      <title>Beyond traceroute</title>
      <link>https://jackliusr.github.io/posts/2022/12/beyond-traceroute/</link>
      <pubDate>Fri, 16 Dec 2022 10:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/beyond-traceroute/</guid>
      <description>I wondered why I was asked twice about network troubleshooting between two machines and the destination machine is not reachable directly. It seems there are somethings I didn’t understand fully or I missed something.
 Today I googled &amp;#34;tracert is not enough&amp;#34; and found Traceroute Limitations Explained. It explains my doubts now.
 Traceroute Limitations Explained gives some limitations of traceroute and introduce their production to avoid those limitations. Are there any other ways?</description>
    </item>
    
    <item>
      <title>What&#39;s the difference between kustomization and component</title>
      <link>https://jackliusr.github.io/posts/2022/12/whats-the-difference-between-kustomization-and-component/</link>
      <pubDate>Mon, 12 Dec 2022 12:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/whats-the-difference-between-kustomization-and-component/</guid>
      <description>The real differences is quoted here. You can find the content here
 A kustomization that is marked as a Component has basically the same capabilities as a normal kustomization. The main distinction is that they are evaluated after the resources of the parent kustomization (overlay or component) have been accumulated, and on top of them. This means that: A component with transformers can transform the resources that an overlay has previously specified in the resources field.</description>
    </item>
    
    <item>
      <title>Do we need a microservice framework</title>
      <link>https://jackliusr.github.io/posts/2022/12/do-we-need-a-microservice-framework/</link>
      <pubDate>Fri, 09 Dec 2022 22:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/do-we-need-a-microservice-framework/</guid>
      <description>Today I was asked which framework was used in my design of microservice systems. I answered those concerns of microservice are handled natively by kubernetes when my systems are deployed into kubernetes clusters. I will not use those frameworks in my design of microservices.
 The question sparked several questions in my mind. Here are those questions. Why do we still need microservice frameworks when kubernetes is the de-facto platform now?</description>
    </item>
    
    <item>
      <title>Kubernetes metric options</title>
      <link>https://jackliusr.github.io/posts/2022/12/kubernetes-metric-options/</link>
      <pubDate>Thu, 08 Dec 2022 23:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/12/kubernetes-metric-options/</guid>
      <description>In normal kubernetes metrics, you will find cAdvisor, Metrics Server, Kubernetes API Server, Node Exporter, and Kube-State-Metrics as source of metrics. In last 2 days, I noticed prometheus-adapter. Today KEDA popped up in my mind. I checked its website and found it can be source of metric as well.
 cAdvisor, Metrics Server, Kubernetes API Server, Node Exporter, and Kube-State-Metrics can be considered as in-cluster source of metric. However KEDA is about out-cluster source of metrics.</description>
    </item>
    
    <item>
      <title>Unable to upload Crashlytics dSYM file during build phase of a flutter project due to script error</title>
      <link>https://jackliusr.github.io/posts/2022/11/unable-to-upload-crashlytics-dsym-file-during-build-phase-of-a-flutter-project-due-to-script-error/</link>
      <pubDate>Mon, 28 Nov 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/11/unable-to-upload-crashlytics-dsym-file-during-build-phase-of-a-flutter-project-due-to-script-error/</guid>
      <description>Recently I added Crashlytics into my project on Oct 25, 2022. I encountered this issue and spent a while to fix it. Today I had to figure out how to do it again, and spent a while. I hated to do that again, so here is this article.
 The key message is the first one below. It is quite misleading and lead me to wrong direction to change DEBUG_INFORMATION_FORMAT.</description>
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    <item>
      <title>Install release version of mobile application into iOS without testflight</title>
      <link>https://jackliusr.github.io/posts/2022/11/install-release-version-of-mobile-application-into-ios-without-testflight/</link>
      <pubDate>Thu, 24 Nov 2022 13:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/11/install-release-version-of-mobile-application-into-ios-without-testflight/</guid>
      <description>Last three days, I found an issue can only be reproduced in realease mode.The beta testing cycle via testflight takes too long and it definitely is not the option. I debugged my application in iOS before. One thing popped up in my mind whether I can put release mode of my application into iOS using the debug tool of vs code.
 I changed my launch.json as below in my project and debug my application.</description>
    </item>
    
    <item>
      <title>Learning Microsoft azure or google cloud</title>
      <link>https://jackliusr.github.io/posts/2022/10/learning-microsoft-azure-or-google-cloud/</link>
      <pubDate>Sun, 23 Oct 2022 00:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/10/learning-microsoft-azure-or-google-cloud/</guid>
      <description>Today when I leant SRE course from cloudskillsboost, the first course is google cloud foundation. SRE is great. cloudskillsboost should be best place to learn SRE as it is originated there.
 </description>
    </item>
    
    <item>
      <title>SDUI, odoo, metadata driven ui, active data dictionary, data driven ui</title>
      <link>https://jackliusr.github.io/posts/2022/10/sdui-odoo-metadata-driven-ui-active-data-dictionary-data-driven-ui/</link>
      <pubDate>Thu, 13 Oct 2022 14:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/10/sdui-odoo-metadata-driven-ui-active-data-dictionary-data-driven-ui/</guid>
      <description>Today I re-read Technology Radar Volume 26, SDUI got my attention. In the past, I was very interested in ERP systems, and studied several open source ERP systems such as openerp(now odoo), ofbiz and adempiere. SDUI is quite similar to technologies used in those open sourced ERP systems.
     technology
 data source
 ui complex
   SDUI
 server end logic decides/graphQL
    odoo</description>
    </item>
    
    <item>
      <title>FaceID using customized built postgresql</title>
      <link>https://jackliusr.github.io/notes/face-identication-postgresql/</link>
      <pubDate>Fri, 30 Sep 2022 20:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/face-identication-postgresql/</guid>
      <description>One of my past projects is based neural network in 2020. The solution is quite simple:
   put the feature vectors into postgresql database
  create distanced based index
   I adopted the model and algrithm from face_recognition, and my team trained on sample faces from our internal system to improve the accuracy to reduce the human involvement and save costs. During development, we found that there is a limit of postgres: CUBE_MAX_DIM, my team customize the build of postgreql to work around the limit.</description>
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    <item>
      <title>How to build strong technology career?</title>
      <link>https://jackliusr.github.io/notes/how-to-build-strong-tech-career/</link>
      <pubDate>Fri, 30 Sep 2022 20:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/how-to-build-strong-tech-career/</guid>
      <description>The full article &amp;#34;How to Build a Strong Career in Tech&amp;#34; from Thiago Ghisi is at https://www.linkedin.com/pulse/how-build-strong-career-tech-thiago-ghisi/. I want to put the gist here for my reference.
 How does a Successful Career in Tech look like?
 Definition of a Successful Career The candidate resume metadata doesn’t often lie
 resume metadata: Impact of their ideas on a large number of people directly or indirectly. Success = Impact &amp;amp; Influence!</description>
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    <item>
      <title>debug flutter iOS application in MacOS</title>
      <link>https://jackliusr.github.io/posts/2022/09/debug-flutter-ios-application-in-macos/</link>
      <pubDate>Thu, 29 Sep 2022 14:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/09/debug-flutter-ios-application-in-macos/</guid>
      <description>iPhone Enable developer mode:
 Setting -→ PPrivacy &amp;amp; Security -→ Developer Mode
   IDE Android Studio It is quite straight forward in Android Studio.
  Install flutter plugin and restart Android studio
    VSCode  select the Run and Debug icon in the Activity Bar
  Select &amp;#34;Dart &amp;amp; Flutter&amp;#34; in &amp;#34;RUN AND DEBUG&amp;#34; dropdown list       Edit flutter iphone setting       Change launch.</description>
    </item>
    
    <item>
      <title>Unit test and widget test in flutter</title>
      <link>https://jackliusr.github.io/posts/2022/09/unit-test-and-widget-test-in-flutter/</link>
      <pubDate>Wed, 28 Sep 2022 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/09/unit-test-and-widget-test-in-flutter/</guid>
      <description>It is quite easy to refactor code using IDEs, however it will be a different story considing to refactor to testable code.
 Concerns The refactor functionality in IDE is based on rigor theories and algorithm to make sure the refactors don’t change the behaviours of programs and get it better organized. One of the theories, can be found here
   Target Refactor code to testable codes following best practices.</description>
    </item>
    
    <item>
      <title>How to resolve podfile dependency issues of google_mobile_ads in flutter</title>
      <link>https://jackliusr.github.io/posts/2022/09/how-to-resolve-podfile-dependency-issues-of-google_mobile_ads-in-flutter/</link>
      <pubDate>Tue, 13 Sep 2022 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/09/how-to-resolve-podfile-dependency-issues-of-google_mobile_ads-in-flutter/</guid>
      <description>There are 27 issues with podfile dependency issues of google_mobile_ads in its repository googleads-mobile-flutter at github Here you can find those issues. My team encountered this issue in the past weeks. Today I had the issue again. To save my time in future, I kept my approach here this time.
  Use the following search keywords in cs.github.com
path:pubspec.yaml google_mobile_ads firebase_analytics
     locate a good candidate with appropriate version of combinations of the following components.</description>
    </item>
    
    <item>
      <title>conditional compiling in flutter project</title>
      <link>https://jackliusr.github.io/posts/2022/09/conditional-compiling-in-flutter-project/</link>
      <pubDate>Sun, 11 Sep 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/09/conditional-compiling-in-flutter-project/</guid>
      <description>In the last week, I intermittently worked on how to compile a flutter project conditionally like the way c/c++ in busy daily work schedules. I knew that flavor is the way to go, however there are still serveral issues opened to explore to make it better or to understand the rationale behind the scene.
   Dependency Injections using get_it and injectable: Tree Shaking Capability
  Pack only neccessary components into the mobile app:</description>
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    <item>
      <title>Sudoku</title>
      <link>https://jackliusr.github.io/portfolio/sudoku/</link>
      <pubDate>Fri, 09 Sep 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/portfolio/sudoku/</guid>
      <description>My first puzzle game, implemented in flutters. I intend to integrate github action, fastlane, google adMob, google analytics and firebase.
 sudoku
 </description>
    </item>
    
    <item>
      <title>Privacy Policy</title>
      <link>https://jackliusr.github.io/privacy/</link>
      <pubDate>Mon, 05 Sep 2022 14:50:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/privacy/</guid>
      <description>Privacy Policy
Last updated: September, 2022
We care about protecting your personal information. This Privacy Policy (“Policy”) explains how Fun15 and its subsidiaries and affiliated companies (“we,” or “us”) collect, use, and share your personal information when you access or use our websites, our mobile applications (“Apps”), or any associated features, content, or pages owned or operated by us (collectively, “Services”) that link to this Policy. This Policy does not address the privacy practices of any third parties that we do not own or control.</description>
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    <item>
      <title>Binary Search</title>
      <link>https://jackliusr.github.io/posts/2022/08/binary-search/</link>
      <pubDate>Thu, 11 Aug 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/08/binary-search/</guid>
      <description>Serveral months ago, I practiced serveral binary leetcode questions, and I was confused about the following several things: I didn’t pay much attentions to it then, I thought I will get the hang of it after serveral practices. However after serveral practice, I still confused in binary search problems. Latest week an article mentions binary search at https://leetcode.wang/. Little searching, I found more information about this such as lower bound, upper bound, equal-range, open/close range, middle point etc.</description>
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    <item>
      <title>Shift-lefts in kubernetes with datree</title>
      <link>https://jackliusr.github.io/posts/2022/08/shift-lefts-in-kubernetes-with-datree/</link>
      <pubDate>Tue, 09 Aug 2022 11:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/08/shift-lefts-in-kubernetes-with-datree/</guid>
      <description>Shift-left is a things nowadays. Recently I read an articles about that beyond testing and security. Today I gave it a try using datree and found that there are still a lot of places to improve in one of my clusters. It is not just a small number. There maybe are many new concepts, configurations and best practicies behind the numbers.
 kubectl datree test &amp;gt; test.log rg -n ❌ test.</description>
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    <item>
      <title>Setup k8s monitoring</title>
      <link>https://jackliusr.github.io/posts/2022/08/setup-k8s-monitoring/</link>
      <pubDate>Tue, 09 Aug 2022 09:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/08/setup-k8s-monitoring/</guid>
      <description>Kuberneters dashboard doesn’t give enough information about node and cluster information during rececent loading test. I sought to other options. Prometheus and grafana are the de-facto standards. It’s a no-brainer choice. The most important things is how to make them working together.
 Setup Prometheus and Grafana kubectl create namespace monitoring helm repo add prometheus-community https://prometheus-community.github.io/helm-charts helm repo update helm install prometheus prometheus-community/prometheus -n monitoring helm repo add grafana https://grafana.github.io/helm-charts helm install grafana grafana/grafana -n monitoring kubectl get secret --namespace monitoring grafana -o jsonpath=&amp;#34;{.</description>
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    <item>
      <title>Use cert-manager to secure kubernetes cert-manager behind nginx ingress</title>
      <link>https://jackliusr.github.io/posts/2022/08/use-cert-manager-to-secure-kubernetes-cert-manager-behind-nginx-ingress/</link>
      <pubDate>Tue, 02 Aug 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/08/use-cert-manager-to-secure-kubernetes-cert-manager-behind-nginx-ingress/</guid>
      <description>Today I had a case to expose serveral kubernetes dashboard with cert-manager. Initiallly I thought it should be quite easy to setup, but the reality was quite different. My intial yaml is as following.
 apiVersion: networking.k8s.io/v1 kind: Ingress metadata: name: ingress-global-dash namespace: kubernetes-dashboard labels: name: ingress-global-dash use-http01-solver: &amp;#34;true&amp;#34; annotations: cert-manager.io/cluster-issuer: &amp;#34;test-issuer&amp;#34; spec: ingressClassName: nginx rules: - host: &amp;#34;dashboard.example.com&amp;#34; http: paths: - pathType: Prefix path: &amp;#34;/&amp;#34; backend: service: name: kubernetes-dashboard port: number: 80 #later changed to 443 according to port of kubernetes-dashboard svc tls: # &amp;lt; placing a host in the TLS config will determine what ends up in the cert&amp;#39;s subjectAltNames - hosts: - dashboard.</description>
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    <item>
      <title>Set timezone in asp.net 6.0 in linux container</title>
      <link>https://jackliusr.github.io/posts/2022/07/set-timezone-in-asp.net-6.0-in-linux-container/</link>
      <pubDate>Thu, 21 Jul 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/07/set-timezone-in-asp.net-6.0-in-linux-container/</guid>
      <description>According to many articles one the web, the way to set timezone is as following:
 cp /usr/share/zoneinfo/Asia/Singapore /etc/localtime echo &amp;#39;Asia/Singapore&amp;#39; &amp;gt; /etc/timezone   You can indeed get the correct time if you run it in dotnet core 5 docker linux containers. However you couldn’t get the correct local time in dotnet 6.0. I found the issue About time incorrect of docker image about aspnet-6 #62545. After I tried serveral combinations mentioned in the issue, finally I got a working solution.</description>
    </item>
    
    <item>
      <title>Reflection on nginx usage</title>
      <link>https://jackliusr.github.io/posts/2022/07/reflection-on-nginx-usage/</link>
      <pubDate>Sat, 09 Jul 2022 17:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/07/reflection-on-nginx-usage/</guid>
      <description>Prologue I never thought I will use nginx extensively in systems I involved after I found that nginx ingress has some limitations comparing to istio in 2021. Nginx is more than reverse proxy or webservers which I thought initially after several months of extensive usage in the past. Here I list serveral advanced use case I countered or discussed with other experts.
   CDN MaxCDN use
 https://docs.nginx.com/nginx/admin-guide/content-cache/content-caching/</description>
    </item>
    
    <item>
      <title>eksctl Steps</title>
      <link>https://jackliusr.github.io/posts/2022/07/eksctl-steps/</link>
      <pubDate>Fri, 01 Jul 2022 07:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/07/eksctl-steps/</guid>
      <description>I only noticed the steps after one ergent cancelling of creating. I didn’t find corresponding nodes and wondered what happened. I deleted my cluster and recreated one.
 I knew I can create nodegroup after creating cluster and not sure if I can do those sub tasks this way as well. Leave it here for later investigation.
 2 sequential tasks: { create cluster control plane &amp;#34;uat-local-intl&amp;#34;, 2 sequential sub-tasks: { 4 sequential sub-tasks: { wait for control plane to become ready, associate IAM OIDC provider, 4 parallel sub-tasks: { 2 sequential sub-tasks: { create IAM role for serviceaccount &amp;#34;backend-apps/s3-reader&amp;#34;, create serviceaccount &amp;#34;backend-apps/s3-reader&amp;#34;, }, 2 sequential sub-tasks: { create IAM role for serviceaccount &amp;#34;backend-apps/cache-access&amp;#34;, create serviceaccount &amp;#34;backend-apps/cache-access&amp;#34;, }, 2 sequential sub-tasks: { create IAM role for serviceaccount &amp;#34;kube-system/cluster-autoscaler&amp;#34;, create serviceaccount &amp;#34;kube-system/cluster-autoscaler&amp;#34;, }, 2 sequential sub-tasks: { create IAM role for serviceaccount &amp;#34;kube-system/aws-node&amp;#34;, create serviceaccount &amp;#34;kube-system/aws-node&amp;#34;, }, }, restart daemonset &amp;#34;kube-system/aws-node&amp;#34;, }, create nodegroup &amp;#34;ng-1&amp;#34;, } }   </description>
    </item>
    
    <item>
      <title>My first usage of jsonnet</title>
      <link>https://jackliusr.github.io/posts/2022/06/my-first-usage-of-jsonnet/</link>
      <pubDate>Sat, 25 Jun 2022 10:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/my-first-usage-of-jsonnet/</guid>
      <description>In the past I knew jsonnet, however I didn’t commit too much time to learn it until recently I encountered a data driven scenario, generating istio yaml configurations based on an array of data. The scenario is business driven, and I can foresee that there will be more data coming. What a waste of time to repeat the copy/paste procedures with little tweaks. I hated to do that again and again.</description>
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    <item>
      <title>Add certificates to existing gateway with non-synch resources</title>
      <link>https://jackliusr.github.io/posts/2022/06/add-certificates-to-existing-gateway-with-non-synch-resources/</link>
      <pubDate>Thu, 23 Jun 2022 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/add-certificates-to-existing-gateway-with-non-synch-resources/</guid>
      <description>I started one of my certificates using cert-manager and letsencrypt without root domain in one product system. Later I tried to add root domain to the certificate as our customer requested withou success at first day. I figured out how to do that next morning. Here are my the success one and several failed attempts.
 Here some background information of this system: gitops + argocd
 Successful solution Considering that the app argocd is in manual synchronization mode, I can do that changes in place in kubernetes instead of the git repo.</description>
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    <item>
      <title>recover from mysql XA transaction issues</title>
      <link>https://jackliusr.github.io/posts/2022/06/recover-from-mysql-xa-transaction-issues/</link>
      <pubDate>Tue, 21 Jun 2022 10:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/recover-from-mysql-xa-transaction-issues/</guid>
      <description>In the past 1 week, I encountered an issue that I couldn’t add a column to a table in one of our production database. I thought restart would resolve the issue. After a restart, however the issue still persist. I checked logs in error/mysql-error-running.log in rds and noticed there are two transactions in prepared state after recovery. In the first gooogle search result page, How to Deal with XA Transactions Recovery caught my attention.</description>
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    <item>
      <title>Do you still need to care ChatOps</title>
      <link>https://jackliusr.github.io/posts/2022/06/do-you-still-need-to-care-chatops/</link>
      <pubDate>Sat, 11 Jun 2022 17:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/do-you-still-need-to-care-chatops/</guid>
      <description>ChatOps has its place, even more prominent with AI and rich integration with other systems.
 I learnt ChatOps in the past when I first heard hubot. Later GitOps and Kubernetes grabbed my attention. I didn’t see how ChatOps fit in GitOps until I saw this 湾区日报是如何运作的？ today after I implemented an integration with telegram bot APIs.
 What Are the Benefits of ChatOps? enumerates the benefits. In my eyes I saw other benefits or more benefits in productivity when considing the full potentials of ChatOps.</description>
    </item>
    
    <item>
      <title>Reflection on my choice of cicd in the past</title>
      <link>https://jackliusr.github.io/posts/2022/06/reflection-on-my-choice-of-cicd-in-the-past/</link>
      <pubDate>Fri, 10 Jun 2022 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/reflection-on-my-choice-of-cicd-in-the-past/</guid>
      <description>TLDR: my CICD choice: argo-cd and argo-workflow
Since I chose argocd and github action as our CICD pipeline two years ago, I rarely thought about other choices and the reason I made the choices. Recently I leant from several sources that jenkins is still widely used, it arouse my interest on this subject again. I reconsidered my choice and layed out the reasons here for my future references.
I didn&amp;rsquo;t have a good impression with java in my past java projects.</description>
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    <item>
      <title>Istio troubleshooting in new scenario that one service to expose into multiple domains and multiple ingress gateways</title>
      <link>https://jackliusr.github.io/posts/2022/06/istio-troubleshooting-in-new-scenario-that-one-service-to-expose-into-multiple-domains-and-multiple-ingress-gateways/</link>
      <pubDate>Wed, 08 Jun 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/istio-troubleshooting-in-new-scenario-that-one-service-to-expose-into-multiple-domains-and-multiple-ingress-gateways/</guid>
      <description>Since my first time to configure istio with proxy protocol supports in aws, istio and envoyproxy changed a lot. In the past several days, I was exposed to a different scenario that one service to expose into multiple domains.
 Things are getting not straighforward, I struggled to make it success yesterday. Today another layer of complexity was added into my cluster: an extra ingressgateway for some services.
 For multiple ingress gateways, I followed this article, however my setup is more complex than that.</description>
    </item>
    
    <item>
      <title>Make a S3 bucket public</title>
      <link>https://jackliusr.github.io/posts/2022/06/make-a-s3-bucket-public/</link>
      <pubDate>Wed, 08 Jun 2022 08:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/make-a-s3-bucket-public/</guid>
      <description>Turn off &amp;#34;Block public access (bucket settings)&amp;#34;        Access control list (ACL): give Everyone (public access) object lists and bucket ACL read.          Policy Policy to attach to a role, so the role can be used to upload resources and put the ACL on the uploaded objects.
 { &amp;#34;Version&amp;#34;: &amp;#34;2012-10-17&amp;#34;, &amp;#34;Statement&amp;#34;: [ { &amp;#34;Sid&amp;#34;: &amp;#34;VisualEditor0&amp;#34;, &amp;#34;Effect&amp;#34;: &amp;#34;Allow&amp;#34;, &amp;#34;Action&amp;#34;: &amp;#34;s3:ListBucket&amp;#34;, &amp;#34;Resource&amp;#34;: &amp;#34;arn:aws:s3:::demo&amp;#34; }, { &amp;#34;Sid&amp;#34;: &amp;#34;VisualEditor1&amp;#34;, &amp;#34;Effect&amp;#34;: &amp;#34;Allow&amp;#34;, &amp;#34;Action&amp;#34;: [ &amp;#34;s3:PutObject&amp;#34;, &amp;#34;s3:GetObject&amp;#34;, &amp;#34;s3:DeleteObject&amp;#34; ], &amp;#34;Resource&amp;#34;: &amp;#34;arn:aws:s3:::demo/*&amp;#34; }, { &amp;#34;Sid&amp;#34;: &amp;#34;VisualEditor2&amp;#34;, &amp;#34;Effect&amp;#34;: &amp;#34;Allow&amp;#34;, &amp;#34;Action&amp;#34;: &amp;#34;s3:ListBucket&amp;#34;, &amp;#34;Resource&amp;#34;: &amp;#34;arn:aws:s3:::demo-public&amp;#34; }, { &amp;#34;Sid&amp;#34;: &amp;#34;VisualEditor3&amp;#34;, &amp;#34;Effect&amp;#34;: &amp;#34;Allow&amp;#34;, &amp;#34;Action&amp;#34;: [ &amp;#34;s3:PutObject&amp;#34;, &amp;#34;s3:GetObject&amp;#34;, &amp;#34;s3:DeleteObject&amp;#34;, &amp;#34;s3:PutObjectAcl&amp;#34; ], &amp;#34;Resource&amp;#34;: &amp;#34;arn:aws:s3:::demo-public/*&amp;#34; } ] }     Uploading command line bash scripts aws s3 sync --acl public-read local-dir/ s3://demo-public/test/   C# source code using (var client = new AmazonS3Client(RegionEndpoint.</description>
    </item>
    
    <item>
      <title>Create another user and grant proper permissions in aws rds mysql</title>
      <link>https://jackliusr.github.io/posts/2022/06/create-another-user-and-grant-proper-permissions-in-aws-rds-mysql/</link>
      <pubDate>Tue, 07 Jun 2022 16:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/create-another-user-and-grant-proper-permissions-in-aws-rds-mysql/</guid>
      <description>When I tried to create an user for application instead of giving out the master user and its password. I got &amp;#34;Error Code: 1045. Access denied for user &amp;#39;mysqladmin&amp;#39;@&amp;#39;%&amp;#39; (using password: YES)&amp;#34; when I run &amp;#34;GRANT ALL PRIVILEGES ON demodb.* TO &amp;#39;appadmin&amp;#39;@&amp;#39;%&amp;#39;;&amp;#34;.
 I tried the method in How do I create another master user for my Amazon RDS DB instance that is running MySQL?, it is for creating another master user with more permissions than an app db user.</description>
    </item>
    
    <item>
      <title>istio virtual service with tls - Connection reset by peer</title>
      <link>https://jackliusr.github.io/posts/2022/06/istio-virtual-service-with-tls-connection-reset-by-peer/</link>
      <pubDate>Tue, 07 Jun 2022 11:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/istio-virtual-service-with-tls-connection-reset-by-peer/</guid>
      <description>I got following similar errors when setup my istio clusters.
 Mark bundle as not supporting multiuse 301 istio 301 or 404 error:02FFF036:system library:func(4095):Connection reset by peer * Trying 20.190.14.28:443... * TCP_NODELAY set * Connected to kiali.example.com (20.190.14.28) port 443 (#0) * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /home/ng/anaconda3/ssl/cacert.pem CApath: none * TLSv1.3 (OUT), TLS handshake, Client hello (1): * OpenSSL SSL_connect: Connection reset by peer in connection to kiali.</description>
    </item>
    
    <item>
      <title>Reflection on kubernete usage</title>
      <link>https://jackliusr.github.io/posts/2022/06/reflection-on-kubernete-usage/</link>
      <pubDate>Thu, 02 Jun 2022 21:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/06/reflection-on-kubernete-usage/</guid>
      <description>Today I explained the current infrastructure fleet configurations to our devops team, I have the thought to make a reflection on the things or lessons I learnt in the past and think about what should I do in the next.
 The technologies and tools I used in my projects is as following. There are still a lot of things to learn considering the list in my list and the huge ecosystem of kubernetes.</description>
    </item>
    
    <item>
      <title>Resize volumes when PVCs and PVs are okay and the size of file systems in pods doesn&#39;t change</title>
      <link>https://jackliusr.github.io/posts/2022/05/resize-volumes-when-pvcs-and-pvs-are-okay-and-the-size-of-file-systems-in-pods-doesnt-change/</link>
      <pubDate>Tue, 31 May 2022 20:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/resize-volumes-when-pvcs-and-pvs-are-okay-and-the-size-of-file-systems-in-pods-doesnt-change/</guid>
      <description>Here is an issue with aws-ebs-csi-driver: The size of file system doesn’t change when pvc is expanded. I got the same issue when I tried to do the Curl elk in pods to delete indices this afternoon. I got the message &amp;#34;resize2fs 1.44.5 (15-Dec-2018) open: No such file or directory while opening /dev/nvme1n1&amp;#34; as well when I tried to resize the file system /dev/nvme1n1 in my pod.
 As the issue is about csidriver, it is not in the the result of running command &amp;#34;kubectl get csidriver&amp;#34; on my cluster.</description>
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    <item>
      <title>Curl elk in pods to delete indices</title>
      <link>https://jackliusr.github.io/posts/2022/05/curl-elk-in-pods-to-delete-indices/</link>
      <pubDate>Tue, 31 May 2022 15:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/curl-elk-in-pods-to-delete-indices/</guid>
      <description>Today my staging kibana didn’t show logs. I made the decision to work out a solution to solve issue in hard way this time. I don’t want me in the same situation without solutoins.
 When things go wrong, you can’t login kibana to do management or maintainance works. The left option is managing the data from the command line. In the past I figured out to use curl cli in pod to get some information of elk.</description>
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    <item>
      <title>same device mounted on differences mount points</title>
      <link>https://jackliusr.github.io/posts/2022/05/same-device-mounted-on-differences-mount-points/</link>
      <pubDate>Mon, 30 May 2022 23:01:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/same-device-mounted-on-differences-mount-points/</guid>
      <description>As in my previous article, I gave the following information of my pod. I still have some time before bed, I couldn’t help to seek the reason of that.
 /usr/share/nginx/html # df -h Filesystem Size Used Available Use% Mounted on overlay 80.0G 34.5G 45.5G 43% / tmpfs 64.0M 0 64.0M 0% /dev tmpfs 3.7G 0 3.7G 0% /sys/fs/cgroup /dev/nvme0n1p1 80.0G 34.5G 45.5G 43% /dev/termination-log /dev/nvme0n1p1 80.0G 34.5G 45.5G 43% /etc/resolv.</description>
    </item>
    
    <item>
      <title>Resize Pod volumes in eks</title>
      <link>https://jackliusr.github.io/posts/2022/05/resize-pod-volumes-in-eks/</link>
      <pubDate>Mon, 30 May 2022 22:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/resize-pod-volumes-in-eks/</guid>
      <description>I did resize volume of kubernetes in the past, however I encountered an interesting issue when I did the resizing in different way.
 According to doc, I should only change the requested size in pvc. Today I changed the size of pv first, then pvc. Here was the interesting thing: all things of pv and pvc are fine, but the size of the file system in pod was not changed.</description>
    </item>
    
    <item>
      <title>Get back my missed keypair of EKS</title>
      <link>https://jackliusr.github.io/posts/2022/05/get-back-my-missed-keypair-of-eks/</link>
      <pubDate>Mon, 30 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/get-back-my-missed-keypair-of-eks/</guid>
      <description>Today I needed to scale one of my kubernetes clusterss. Those keys are not in my new laptop since I used Mac Air M1. I didn’t see the increase of nodes several minutes after I run the eksctl scale command. I logged into aws console and found there were several &amp;#34;Failed&amp;#34; messages in activity history of the autoscaling group. All the failed messages shown &amp;#34;Launching a new EC2 instance. Status Reason: The aaaa-nodegroup-ng-1-67:8e:b8:8e:33:83:93:68 key pair does not exist.</description>
    </item>
    
    <item>
      <title>Istio Envoy passthrough goes wrong when port 80 are used for SMTP protocol instead of standard ports</title>
      <link>https://jackliusr.github.io/posts/2022/05/istio-envoy-passthrough-goes-wrong-when-port-80-are-used-for-smtp-protocol-instead-of-standard-ports/</link>
      <pubDate>Sun, 29 May 2022 17:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/istio-envoy-passthrough-goes-wrong-when-port-80-are-used-for-smtp-protocol-instead-of-standard-ports/</guid>
      <description>I wrote this on September 7, 2021 and published it on linkedin. However I found that it can be hard to search if I put there. so I put here anoter copy
 TLDR: if your external SMTP is using port 80 instead of standard ports in an istio mesh, create a Service Entry for the external SMTP.
 These two days, a strange timeout issue happened in one of our kubernetes clusters when trying to send emails via SMTP even though the same configuration works perfectly on our development machines.</description>
    </item>
    
    <item>
      <title>Kubernetes and immutable infrastructure: docker image digest and image labels</title>
      <link>https://jackliusr.github.io/posts/2022/05/kubernetes-and-immutable-infrastructure-docker-image-digest-and-image-labels/</link>
      <pubDate>Fri, 27 May 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/kubernetes-and-immutable-infrastructure-docker-image-digest-and-image-labels/</guid>
      <description>Summary: use digest as the way to refer to docker images in kubernetes resources, put commit id in image labels.
 An idempotency and immutable infrastructure has a slew of benefits. I am a firm believer of it and I did my best to keep several projects in that way. In the past few weeks, I helped one friend to resolve system structure, performance issue and development experience of one of his projects.</description>
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    <item>
      <title>projected volumes in argo-workflow</title>
      <link>https://jackliusr.github.io/posts/2022/05/projected-volumes-in-argo-workflow/</link>
      <pubDate>Thu, 26 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/projected-volumes-in-argo-workflow/</guid>
      <description>Yesterday I added gitconfig volume and mounted to /root. However today the logs of the workflow shows netrc is mounted to /root as well. They are conflicted. Kubernetes supports projected volume which supports following types. my netrc and gitconfig are in the list.
   secret
  downwardAPI
  configMap
  serviceAccountToken
   I made the small tweak to hello world sample workflow. Here is the my demo workflow with projected volumes.</description>
    </item>
    
    <item>
      <title>First trial mermaid Diagrams in hugo</title>
      <link>https://jackliusr.github.io/posts/2022/05/first-trial-mermaid-diagrams-in-hugo/</link>
      <pubDate>Tue, 24 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/first-trial-mermaid-diagrams-in-hugo/</guid>
      <description>Since I read the textual UML in the 2015 techradar, I am a big fan of it. I used plantuml in my technical writing in Asia Fusion Technology. Later I found asciidoc, and I wanted to combine the two together. I regularly read techradar from thoughtworks and found mermaidjs in NOV 2018 techradar. However it was little hard to integrate that into my site at that time. Today I knew Hugo supports Mermaid Diagrams easily.</description>
    </item>
    
    <item>
      <title>docker buildx multi-context, multi-platform, multi-stage and secrets in action</title>
      <link>https://jackliusr.github.io/posts/2022/05/docker-buildx-multi-context-multi-platform-multi-stage-and-secrets-in-action/</link>
      <pubDate>Mon, 23 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/docker-buildx-multi-context-multi-platform-multi-stage-and-secrets-in-action/</guid>
      <description>Prologue Today I migrated several golang projects to golang 1.18. I had several hiccups today. Let’s called docker buildx multi-context, multi-platform, multi-stage and secrets in action.
   Multi-platform I started to look into one iOS and android app of our projects one week ago, and started to use Mac Air M1. Mac Air M1 is arm64 based, however our production environment is amd64 based. I had to do some changes to make the images built on my or my colleagues&amp;#39; machine can be runnable in production environment.</description>
    </item>
    
    <item>
      <title>Reflection on implementation of CICD using argo-workflows</title>
      <link>https://jackliusr.github.io/posts/2022/05/reflection-on-implementation-of-cicd-using-argo-workflows/</link>
      <pubDate>Sun, 22 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/reflection-on-implementation-of-cicd-using-argo-workflows/</guid>
      <description>I had some projects on github, gitlab and gitee. Their CI pipelines are quite different. To save the troubles and times, it is a natural choice to seek other options to unify on one solution.
 At first, I looked into jenkins x. However it is quite heavy and with opinions. Considering its Maturity Level Matrix, I am not sure I can make it happen in my limited after hours times.</description>
    </item>
    
    <item>
      <title>argo-workflow: secrets for git</title>
      <link>https://jackliusr.github.io/posts/2022/05/argo-workflow-secrets-for-git/</link>
      <pubDate>Sat, 21 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/argo-workflow-secrets-for-git/</guid>
      <description>I needed to clone one of my private repositories in one workflow of argo-workflows. I did’t figure a way to mount git artifact into a shared volume at that time. I sought to other options and find https://github.com/argoproj/argo-workflows/issues/1428 and https://www.jeffgeerling.com/blog/2019/mounting-kubernetes-secret-single-file-inside-pod.
 The comment https://github.com/argoproj/argo-workflows/issues/1428#issuecomment-775911838 gives an example to add user name and password into https url. Upon I checked the logs, I found that user and password are shown in the logs of a workflow.</description>
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    <item>
      <title>Argo-event filters: expr filter in action</title>
      <link>https://jackliusr.github.io/posts/2022/05/argo-event-filters-expr-filter-in-action/</link>
      <pubDate>Fri, 20 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/argo-event-filters-expr-filter-in-action/</guid>
      <description>Today I found my argo-events sensor executed triggers which I was not intended to. In the logs, I found that ref fields of those non-intended triggers all started with &amp;#34;refs/heads/dev&amp;#34;. I checked again with document and found this surprising truth:
 https://argoproj.github.io/argo-events/sensors/filters/data/#:~:text=If%20data%20type%20is%20string%2C%20you%20can%20pass%20either%20an%20exact%20value%20or%20a%20regex.%20In%20any%20case%20that%20value%20will%20be%20evaluated%20as%20a%20regex.
 If data type is string, you can pass either an exact value or a regex. In any case that value will be evaluated as a regex.   Considing my following data filter, no wonder it triggers more than I expected.</description>
    </item>
    
    <item>
      <title>Workaround the limitation of authorization header of webhook in argo-events</title>
      <link>https://jackliusr.github.io/posts/2022/05/workaround-the-limitation-of-authorization-header-of-webhook-in-argo-events/</link>
      <pubDate>Wed, 18 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/workaround-the-limitation-of-authorization-header-of-webhook-in-argo-events/</guid>
      <description>Webhook of argo-events supports authentication, however the field is fixed in header. If your callers don’t do that way, you are screwed. Recently days, I was trying to integrate gitee with argo-workflow and argo-events. I hit the wall here.
 TOKEN=&amp;#34;Bearer af3qqs321f2ddwf1e2e67dfda3fs&amp;#34; curl -X POST -H &amp;#34;Authorization: $TOKEN&amp;#34; -d &amp;#34;{your data}&amp;#34; http://xxxxx:12000/example   I kept reading the documents for serveral days and the knowledge sinked in, I got the idea that filters maybe can be used for that as a workaround solution.</description>
    </item>
    
    <item>
      <title>Setup bluetooth mouses in mac air with three not-existing devices</title>
      <link>https://jackliusr.github.io/posts/2022/05/setup-bluetooth-mouses-in-mac-air-with-three-not-existing-devices/</link>
      <pubDate>Tue, 17 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/setup-bluetooth-mouses-in-mac-air-with-three-not-existing-devices/</guid>
      <description>I heard from my colleagues that MacAir M1 is picky about mice and you can find many threads in reddit about this if you use the keywords &amp;#34;reddit mac air m1 mouse issues bluetooth&amp;#34; to search. Today is my lucky day, I encountered the issue too.
 This morning, I brought my Mac Air to office and used the mouse of company. The bluethooth kept spinning and the mouse can’t connect.</description>
    </item>
    
    <item>
      <title>Setup dapr on AWS and calico</title>
      <link>https://jackliusr.github.io/posts/2022/05/setup-dapr-on-aws-and-calico/</link>
      <pubDate>Mon, 16 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/setup-dapr-on-aws-and-calico/</guid>
      <description>Low resource usage Our system had low resource usage, however my several pods got stucked in ContainerCreating state. Kubernetes events show that &amp;#34;add cmd: failed to assign an IP address to container&amp;#34;. &amp;#34;kubectl top nodes&amp;#34; still shows the usage of resources still low.
 jackl@LAPTOP-IIHUF2DR:~$ k --context jack.l@test-dev.ap-southeast-1.eksctl.io top nodes NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% ip-192-168-102-109.ap-southeast-1.compute.internal 143m 7% 3217Mi 45% ip-192-168-110-171.ap-southeast-1.compute.internal 117m 6% 2892Mi 41%     Migrate to calico  Recreate cluster without nodegroups</description>
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    <item>
      <title>Argo-workflows: Generate dynamic json list</title>
      <link>https://jackliusr.github.io/posts/2022/05/argo-workflows-generate-dynamic-json-list/</link>
      <pubDate>Sun, 15 May 2022 12:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/argo-workflows-generate-dynamic-json-list/</guid>
      <description>The journey I worked on a dapr microservice project which need to read a list from a file and do some useful things. Argo-workflow supports loop over a list of items, however one of my steps always got &amp;#34;invalid character &amp;#39;G&amp;#39; looking for beginning of value&amp;#34; before going to next step in the workflow template. The step is as following:
 - name: get-deps inputs: parameters: - name: changes script: image: ubuntu:latest command: [bash] #args: [&amp;#34;echo result was: {{inputs.</description>
    </item>
    
    <item>
      <title>Rich link preview and IM apps</title>
      <link>https://jackliusr.github.io/posts/2022/05/rich-link-preview-and-im-apps/</link>
      <pubDate>Thu, 12 May 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/rich-link-preview-and-im-apps/</guid>
      <description>Two days ago, I have a fun journey to find more about rich link preview features in social media, web apps and IM apps.
 The journey began with that the shared link of one of my company sites in skype was shown without pictures, just a plain link. Searching the feature of skype &amp;#34;link preview&amp;#34;, I found https://socialsharepreview.com/. I knew what missed in the homepage as in the following list.</description>
    </item>
    
    <item>
      <title>My blogging journey</title>
      <link>https://jackliusr.github.io/posts/2022/05/my-blogging-journey/</link>
      <pubDate>Wed, 11 May 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/my-blogging-journey/</guid>
      <description>Usually I don’t want to blog about something, espicially I don’t contribute some original things to internet. Of couse, there are other reasons as well.
 There were many reasons which stopped me in the past to writing. One was that my vocabulary was limited. I started my blogging actitivies back to 2004. At that time, my vocabulary was limited, I think the size of my vocabulary was in the range from 6000-7000 and most words were memorized in isolated way.</description>
    </item>
    
    <item>
      <title>Why I migrate my blog from Jekyll to Hugo</title>
      <link>https://jackliusr.github.io/posts/2022/05/why-i-migrate-my-blog-from-jekyll-to-hugo/</link>
      <pubDate>Mon, 09 May 2022 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/why-i-migrate-my-blog-from-jekyll-to-hugo/</guid>
      <description>I wrote my blogs using Jekyll at this domain almost two years occasionally from 2018 until 2020. I didn’t think to move to Hugo before it was used in one of my company project. After two or three weeks since the project kicked off, I had a thought why not move to Hugo considering several benefits.
 For the uninitiated, Hugo is one of the most popular open-source static site generators.</description>
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    <item>
      <title>A strange issue of kubernetes: New pod kept in CrashloopBackOff in newly joined node.</title>
      <link>https://jackliusr.github.io/posts/2022/05/a-strange-issue-of-kubernetes-new-pod-kept-in-crashloopbackoff-in-newly-joined-node./</link>
      <pubDate>Sun, 08 May 2022 21:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/05/a-strange-issue-of-kubernetes-new-pod-kept-in-crashloopbackoff-in-newly-joined-node./</guid>
      <description>Today I encountered a strange issue with one kubernete cluster. Newly created pods are not created on a newly joined node. There is no errors in logs of pods and the node, events of kubernete. All seems normal. I created a simple nginx pod with nodeName as the problematic node. The pod can be scheduled and created in the node. However the pod was kept in CrashloopBackOff state. There is definitely something wrong with server.</description>
    </item>
    
    <item>
      <title>Setup vscode development for dapr in WSL</title>
      <link>https://jackliusr.github.io/posts/2022/04/setup-vscode-development-for-dapr-in-wsl/</link>
      <pubDate>Tue, 26 Apr 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/04/setup-vscode-development-for-dapr-in-wsl/</guid>
      <description>Dapr development is quite difficult to setup correctly. You can get the idea from (this issue) as the issue is still open now since it was created.
 I followed the instruction to install dapr vs code extension in dapr. My environment is WSL based. I tried several times to try to debug the dapr applications and failed. I noticed in the following screenshot that there was a warning icon before kubernetes.</description>
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    <item>
      <title>Run a flutter app on Windows Subsystem for Android</title>
      <link>https://jackliusr.github.io/posts/2022/04/run-a-flutter-app-on-windows-subsystem-for-android/</link>
      <pubDate>Wed, 13 Apr 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/04/run-a-flutter-app-on-windows-subsystem-for-android/</guid>
      <description>Keep WSA running WSA seems sometimes will exit after a while idle time. I need to run the following command to keep it running.
 adb connect YOUR_IP_ADDRESS     Run App According to How to use Windows Subsystem for Android as a development tool, there are several ways to run flutter apps in WSA.
 Android studio When I try to run a project of my company in Android studio, I kept get the error &amp;#34;An unexpected packet was received before the handshake&amp;#34;.</description>
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    <item>
      <title>Reflection on the usage of bazel</title>
      <link>https://jackliusr.github.io/posts/2022/04/reflection-on-the-usage-of-bazel/</link>
      <pubDate>Tue, 12 Apr 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/04/reflection-on-the-usage-of-bazel/</guid>
      <description>TLDR: Bazel is definitely worth to use on your projects even though it has minimum supports of some languages such as C#.
   Prologue Before I was interested in bazel, I always thought why bother to learn a new building system even I knew that kubernetes once was built with bazel. 4 months ago, I was involved in a micro service structured project. I was dissatisfied with dev workflow using skaffold and I looked other options in the market.</description>
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    <item>
      <title>Install Windows Subsystem for Android</title>
      <link>https://jackliusr.github.io/posts/2022/04/install-windows-subsystem-for-android/</link>
      <pubDate>Mon, 11 Apr 2022 19:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/04/install-windows-subsystem-for-android/</guid>
      <description>Install WAS  Upgrade to windows 11 latest version (GA, Preview, Evaluation etc).
  Upgrade microsoft appstore to latest version
  Setting→Time &amp;amp; Language → Langage &amp;amp; Region → Region: USA
  Open AppStore, Search Amazon Appstore and install Amazon Appstore. it will install Windows Subsystem for Android as well.
     Install applications as user using Amazon AppStore  Register as Amazon US user</description>
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    <item>
      <title>What can you bring to the company?</title>
      <link>https://jackliusr.github.io/notes/what-can-you-bring-to-the-company/</link>
      <pubDate>Wed, 23 Feb 2022 22:30:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/what-can-you-bring-to-the-company/</guid>
      <description></description>
    </item>
    
    <item>
      <title>Configure action runner in eks&#43;calico environment</title>
      <link>https://jackliusr.github.io/posts/2022/02/configure-action-runner-in-eks-calico-environment/</link>
      <pubDate>Sat, 19 Feb 2022 13:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2022/02/configure-action-runner-in-eks-calico-environment/</guid>
      <description>Last week I setup our staging kubernetes environment, however the once worked version of runnerset yaml configuration didn’t work. I tried different combination of controller and summerwind/actions-runner-dind image, fully customized template portion with RUNNER_xxx arguments. I still got &amp;#34;Http response code: NotFound from &amp;#39;POST https://api.github.com/actions/runner-registration&amp;#39;&amp;#34; for every combination of those combinations in the logs of runner pods. I thought RunnerDeployment is stateless and less complex than RunnerSet. I gave it a try.</description>
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    <item>
      <title>Istio Envoy passthrough goes wrong when port 80 are used for SMTP protocol instead of standard ports</title>
      <link>https://jackliusr.github.io/posts/2021/09/istio-envoy-passthrough-goes-wrong-when-port-80-are-used-for-smtp-protocol-instead-of-standard-ports/</link>
      <pubDate>Tue, 07 Sep 2021 09:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/09/istio-envoy-passthrough-goes-wrong-when-port-80-are-used-for-smtp-protocol-instead-of-standard-ports/</guid>
      <description>TLDR: if your external SMTP is using port 80 instead of standard ports in an istio mesh, create a Service Entry for the external SMTP.
 These two days, a strange timeout issue happened in one of our kubernetes clusters when trying to send emails via SMTP even though the same configuration works perfectly on our development machines.
 At first, I thought it was due to SecureSocketOptions.startTLS. I changed it to SecureSocketOptions.</description>
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    <item>
      <title>Apply proxy protocol listener filters to specific ports in istio</title>
      <link>https://jackliusr.github.io/posts/2021/08/apply-proxy-protocol-listener-filters-to-specific-ports-in-istio/</link>
      <pubDate>Sat, 28 Aug 2021 09:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/08/apply-proxy-protocol-listener-filters-to-specific-ports-in-istio/</guid>
      <description>Two days ago, our web applications need to get clients&amp;#39; real IP address. Our sites is hosted in kubernetes, isito is used for ingress controll. behind cloud load balancers, it is not easy to make it work.
 There are two ways to do that in alibaba classic load balancer: http/https listeners, and TCP listeners with proxy protocol
 HTTPS listeners is crossed out due to certificate issue. HTTPS listeners can use integrated certificates or self uploaded certificates.</description>
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    <item>
      <title>Setup opencv in windows</title>
      <link>https://jackliusr.github.io/posts/2021/04/setup-opencv-in-windows/</link>
      <pubDate>Sat, 24 Apr 2021 11:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/04/setup-opencv-in-windows/</guid>
      <description> Download opencv release package https://github.com/opencv/opencv/releases/download/4.5.2/opencv-4.5.2-vc14_vc15.exe
  run the downloaded executable, and say install it at c:\software\opencv
  run opencv\build\setup_vars_opencv4.cmd
   After above steps, your environment is ready. However there is a caveat, the environment is ephemeral.
 </description>
    </item>
    
    <item>
      <title>DCF Myths</title>
      <link>https://jackliusr.github.io/notes/dcf-myth/</link>
      <pubDate>Sat, 17 Apr 2021 12:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/dcf-myth/</guid>
      <description>DCF Myth 1: If you have a D(discount rate) and a CF (cash flow), you have a DCF! Consistency Tests for DCF Hall of shame DCF checklist   DCF Myth 2: A DCF is an exercise in modeling and number crunching! Connecting Stories to Numbers: The Process Tie to the life cycle: The Investor Angle Tie to the Life Cycle: Implications for managers     DCF Myth 1: If you have a D(discount rate) and a CF (cash flow), you have a DCF!</description>
    </item>
    
    <item>
      <title>Private Internet Access</title>
      <link>https://jackliusr.github.io/notes/pia/</link>
      <pubDate>Sat, 17 Apr 2021 12:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/pia/</guid>
      <description>Private Internet Access Desktop Client window dev environemnt   https://www.qt.io/download-qt-installer
  How to find the Qt5 CMake module on Windows
   [1]
     1. https://github.com/pia-foss/desktop   </description>
    </item>
    
    <item>
      <title>Tryton</title>
      <link>https://jackliusr.github.io/notes/tryton/</link>
      <pubDate>Sat, 17 Apr 2021 12:40:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/notes/tryton/</guid>
      <description>Tryton WSGI   dev: werkzeug
  prod: µwsgi[1]
   Deployment: nginx for static assets and tls termination, µwsgi for service
  HA &amp;amp; Load Balancing   race-condition[2]
  cron: distributed ?
    Training https://github.com/coopengo/tryton-training
     1. https://discuss.tryton.org/t/wsgi-server-choice/2766/3  2. https://discuss.tryton.org/t/multiple-tryton-server-backend-with-nginx-frontend/3843   </description>
    </item>
    
    <item>
      <title>Setup softHSM2</title>
      <link>https://jackliusr.github.io/posts/2021/04/setup-softhsm2/</link>
      <pubDate>Mon, 12 Apr 2021 16:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/04/setup-softhsm2/</guid>
      <description>Secrets Management is the strong suit of Hashicorp vault. Open source edition is little limited comparing to cloud and enterprise edition, and cloud and enterprise editions sometimes are not allowed due to some reasons. bank-vaults seems a promising solution based on open source edition of Hashicorp Vault.
 Advanced usage of vault will involve HSM and SoftHSM is good start point without spending several hundards bucks. Besides, HSM is widely used in Financial sector, blockchain and cryptocurrency.</description>
    </item>
    
    <item>
      <title>Install calico cni in alicloud ack and advanced dns troubleshooting in kubernetes</title>
      <link>https://jackliusr.github.io/posts/2021/03/install-calico-cni-in-alicloud-ack-and-advanced-dns-troubleshooting-in-kubernetes/</link>
      <pubDate>Fri, 12 Mar 2021 19:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/03/install-calico-cni-in-alicloud-ack-and-advanced-dns-troubleshooting-in-kubernetes/</guid>
      <description>2 weeks I started to learn alicloud to prepare the migration from aws to alicloud. I started the migration this week. Our applications are deployed on kubernetes, I focused on ACK first. The setup journey was bumpy, and most of the issues can be resolved by googling and trial loops. The most difficult one is that dns resolution issue.
 I tried the steps in &amp;#34;Debugging DNS Resolution&amp;#34; [1]. All steps were good except the nslookup step.</description>
    </item>
    
    <item>
      <title>Exposing TCP and UDP services in nginx ingress</title>
      <link>https://jackliusr.github.io/posts/2021/03/exposing-tcp-and-udp-services-in-nginx-ingress/</link>
      <pubDate>Tue, 02 Mar 2021 17:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/03/exposing-tcp-and-udp-services-in-nginx-ingress/</guid>
      <description>Add command line flags in ingress controller:  --tcp-services-configmap
  --udp-services-configmap
     Create configmap apiVersion: v1 kind: ConfigMap metadata: name: tcp-services namespace: ingress-nginx data: 5432: &amp;#34;default/postgres:5432&amp;#34;     Patch the ingress-nginx-controller to allow port 5432 spec: template: spec: containers: - name: controller ports: - containerPort: 6379 hostPort: 6379     Add inbound rule to security group of node groups   Reference: https://minikube.</description>
    </item>
    
    <item>
      <title>Stock Grey market dynamic</title>
      <link>https://jackliusr.github.io/posts/2021/02/stock-grey-market-dynamic/</link>
      <pubDate>Fri, 05 Feb 2021 11:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/02/stock-grey-market-dynamic/</guid>
      <description>Here are the grey market dynamics trading kuaishou in futu and first day in stock. Don’t be gready. Most likely the professional/instutional traders in grey market outsmart you, they don’t leave profit margin for you considering the dynamic in first day trading.
         </description>
    </item>
    
    <item>
      <title>nginx ingress and SPA sites</title>
      <link>https://jackliusr.github.io/posts/2021/01/nginx-ingress-and-spa-sites/</link>
      <pubDate>Mon, 18 Jan 2021 21:53:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/01/nginx-ingress-and-spa-sites/</guid>
      <description>Several months ago, I resolved the issue &amp;#34;404 Error on refresh with SPA&amp;#34; by using nginx try_files directive, this time it was quite different as the apps were deployed into kubernetes. I tried nginx.ingress.kubernetes.io/use-regex:true and nginx.ingress.kubernetes.io/rewrite-target: /$1. To avoid to block others to others to use staging environment, I setup an skaffold local development environment to troubeshooting the issue. I tried following annotation as well.
 nginx.ingress.kubernetes.io/configuration-snippet: | try_files $uri $uri/ /index.</description>
    </item>
    
    <item>
      <title>vega in hugo</title>
      <link>https://jackliusr.github.io/posts/2021/01/vega-in-hugo/</link>
      <pubDate>Sun, 17 Jan 2021 15:26:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/01/vega-in-hugo/</guid>
      <description> var spec = &#39;https:\/\/raw.githubusercontent.com\/vega\/vega\/master\/docs\/examples\/bar-chart.vg.json&#39;; vegaEmbed(&#39;#viz&#39;, spec).then(function(result) { }).catch(console.error);   </description>
    </item>
    
    <item>
      <title>echarts in hugo</title>
      <link>https://jackliusr.github.io/posts/2021/01/echarts-in-hugo/</link>
      <pubDate>Sun, 17 Jan 2021 14:26:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2021/01/echarts-in-hugo/</guid>
      <description>var myChart = echarts.init(document.getElementById(&#39;echarts400&#39;)); var option = JSON.parse(&#34;\n {\n \&#34;textStyle\&#34;:{\n \&#34;color\&#34;:\&#34;#fff\&#34;\n },\n \&#34;title\&#34;:{\n \&#34;text\&#34;:\&#34;2018年11月国内浏览器数据统计\&#34;,\n \&#34;subtext\&#34;:\&#34;浏览器数据分析\&#34;,\n \&#34;x\&#34;:\&#34;center\&#34;,\n \&#34;textStyle\&#34;:{\n \&#34;color\&#34;:\&#34;#FFffFf\&#34;\n }\n },\n \&#34;tooltip\&#34;:{\n \&#34;trigger\&#34;:\&#34;item\&#34;,\n \&#34;formatter\&#34;:\&#34;{a} \u003cbr/\u003e{b} : {c} ({d}%)\&#34;\n },\n \&#34;legend\&#34;:{\n \&#34;type\&#34;:\&#34;scroll\&#34;,\n \&#34;orient\&#34;:\&#34;vertical\&#34;,\n \&#34;right\&#34;:10,\n \&#34;top\&#34;:120,\n \&#34;bottom\&#34;:20,\n \&#34;data\&#34;:[\n \&#34;Chrome\&#34;,\n \&#34;IE 9.0\&#34;,\n \&#34;IE 11.0\&#34;,\n \&#34;QQ\&#34;,\n \&#34;IE 8.0\&#34;,\n \&#34;2345\&#34;,\n \&#34;搜狗高速\&#34;,\n \&#34;Firefox\&#34;,\n \&#34;Safari\&#34;,\n \&#34;其他\&#34;\n ],\n \&#34;textStyle\&#34;:{\n \&#34;color\&#34;:\&#34;#fff\&#34;\n }\n },\n \&#34;series\&#34;:[\n {\n \&#34;name\&#34;:\&#34;浏览器用户比例\&#34;,\n \&#34;type\&#34;:\&#34;pie\&#34;,\n \&#34;radius\&#34;:\&#34;55%\&#34;,\n \&#34;center\&#34;:[\n \&#34;50%\&#34;,\n \&#34;60%\&#34;\n ],\n \&#34;data\&#34;:[\n {\n \&#34;name\&#34;:\&#34;Chrome\&#34;,\n \&#34;value\&#34;:46.88\n },\n {\n \&#34;</description>
    </item>
    
    <item>
      <title>log to stdin of a pod in nested shells</title>
      <link>https://jackliusr.github.io/posts/2020/12/log-to-stdin-of-a-pod-in-nested-shells/</link>
      <pubDate>Wed, 09 Dec 2020 10:35:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/12/log-to-stdin-of-a-pod-in-nested-shells/</guid>
      <description>During practicing the lifecycle handlers of pod, I found it is quite difficult to get the logs logged from preStop handlers. Initially I thought terminationMessagePath maybe is the answer, but no such luck. The preStop handler will be run before the pod is deleted. After deleted, there is no way to get the logs unless those logs are kept in other place such as central log servers etc. Those settings are way complex for a simple practice and time-consuming.</description>
    </item>
    
    <item>
      <title>vscode debug python containers running kubernetes via attachment</title>
      <link>https://jackliusr.github.io/posts/2020/11/vscode-debug-python-containers-running-kubernetes-via-attachment/</link>
      <pubDate>Fri, 20 Nov 2020 19:35:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/11/vscode-debug-python-containers-running-kubernetes-via-attachment/</guid>
      <description>python-guestbook at https://github.com/GoogleCloudPlatform/cloud-code-samples is used to practice debug python containers in kubernetes.
 Google cloud python code vscode plugin 1.7.0 failed to run python on kubernetes or there is no obvious way to do that as depicted in the below pic.      Steps to make it:
  run
skaffold debug     Import ptvsd in the python file to debug, add breakout() before the line to debug</description>
    </item>
    
    <item>
      <title>Jetbrain debug containers in kubernetes</title>
      <link>https://jackliusr.github.io/posts/2020/11/jetbrain-debug-containers-in-kubernetes/</link>
      <pubDate>Fri, 20 Nov 2020 13:35:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/11/jetbrain-debug-containers-in-kubernetes/</guid>
      <description>I can’t debug the dockerdev app following the steps in https://blog.jetbrains.com/go/2020/05/11/using-kubernetes-from-goland/, even after I cloned its source code https://github.com/jackliusr/dockerdev/tree/kubernetes-debug.
 I read several articles before I tried the aboved one. The successful debug after several trial and errors. I added skaffold.yaml to the project and installed Cloud Code. skaffold.yaml can be found at https://github.com/jackliusr/dockerdev/tree/kubernetes-debug. Other jetbrain configuration can be seen in the below pictures.
          cloud code is a very good tool.</description>
    </item>
    
    <item>
      <title>a new way to anti scrapping</title>
      <link>https://jackliusr.github.io/posts/2020/10/a-new-way-to-anti-scrapping/</link>
      <pubDate>Wed, 21 Oct 2020 18:10:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/10/a-new-way-to-anti-scrapping/</guid>
      <description>I loved to read novels. Recently I found that several sites show some garbed characters in square boxes. I went to the original site qidian and those chacters are shown correctly in the orignal site. After little investigation, I found the following information;
          In above pics, 了’s HTML entity code is , it is not as 天.
 How does chrome show the characters correctly?</description>
    </item>
    
    <item>
      <title>Setup kubeflow pipeline on local KIND cluster</title>
      <link>https://jackliusr.github.io/posts/2020/10/setup-kubeflow-pipeline-on-local-kind-cluster/</link>
      <pubDate>Sun, 04 Oct 2020 10:26:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/10/setup-kubeflow-pipeline-on-local-kind-cluster/</guid>
      <description># https://www.kubeflow.org/docs/pipelines/installation/localcluster-deployment/#deploying-kubeflow-pipelines # env/platform-agnostic-pns hasn&amp;#39;t been publically released, so we install from master temporarily export PIPELINE_VERSION=1.0.1 kubectl apply -k &amp;#34;github.com/kubeflow/pipelines/manifests/kustomize/cluster-scoped-resources?ref=$PIPELINE_VERSION&amp;#34; kubectl wait --for condition=established --timeout=60s crd/applications.app.k8s.io kubectl apply -k &amp;#34;github.com/kubeflow/pipelines/manifests/kustomize/env/platform-agnostic-pns?ref=$PIPELINE_VERSION&amp;#34; # expose gui kubectl port-forward -n kubeflow --address 0.0.0.0 svc/ml-pipeline-ui 8080:80   </description>
    </item>
    
    <item>
      <title>About Jack Liu S.R.</title>
      <link>https://jackliusr.github.io/about/</link>
      <pubDate>Sat, 26 Sep 2020 14:50:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/about/</guid>
      <description>In the past years before 2020, I was fascinated with right ways to do softwares and studied following enterprise application technologies. I am still interesting in those technologies. In the covid 19 pandemic period of last half of 2020, I reconsidered life, I shifted my interest into finance and studied accounting, Investment Philosophies, Valuation. When I was Asia Fusion Technology, I was interested in [startups](#startups) and followed them in 2-3 years.</description>
    </item>
    
    <item>
      <title>Create a multiple-nodes KIND kubernetes cluster</title>
      <link>https://jackliusr.github.io/posts/2020/09/create-a-multiple-nodes-kind-kubernetes-cluster/</link>
      <pubDate>Fri, 25 Sep 2020 22:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/09/create-a-multiple-nodes-kind-kubernetes-cluster/</guid>
      <description>KIND supports configuration items and you can find them at https://kind.sigs.k8s.io/docs/user/configuration. Following is the outline of the doc.
 Cluster-Wide Options ︎ Networking: ︎ IP Family ︎ API Server: port and listen address Pod Subnet ︎ Service Subnet ︎ Disable Default CNI: can be used to try other CNI for CKA and CKAD networks kube-proxy mode : iptables, ipvs Nodes: role control-plane, worker Per-Node Options ︎ Extra Mounts ︎ Extra Port Mappings ︎ Kubeadm Config Patches: Kubeadm Config Patches, kubeadm InitConfiguration and JoinConfiguration   My asciicast is as following:</description>
    </item>
    
    <item>
      <title>Pod CrashLoopBackOff Reason</title>
      <link>https://jackliusr.github.io/posts/2020/09/pod-crashloopbackoff-reason/</link>
      <pubDate>Tue, 22 Sep 2020 08:51:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/09/pod-crashloopbackoff-reason/</guid>
      <description>Today one of my deployments always got CrashLoopBackOff. Searching internet don’t gave me the root cause of those errors even I went through all the steps. Steps from internets are all about describe, logs, liveProbe etc. I noticed the reason and exit code in last state when I described one of the pod. It should be the focus point to find root cause of CrashBoopBackOff.
 Containers: nginx: Container ID: containerd://9570e7e67d83692fdbe0e0871919a81222137fcaee2eaecb1eff6b772ec805b1 Image: nginx:1.</description>
    </item>
    
    <item>
      <title>My first post</title>
      <link>https://jackliusr.github.io/posts/2020/08/my-first-post/</link>
      <pubDate>Fri, 21 Aug 2020 18:12:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/08/my-first-post/</guid>
      <description>This is my first adoc post after migration from jekyll to hugo.
   a
  b
  test
   order list testing
  a
  b
   third try to test github action
 </description>
    </item>
    
    <item>
      <title>Why I stick to jekyll</title>
      <link>https://jackliusr.github.io/posts/2020/08/why-i-stick-to-jekyll/</link>
      <pubDate>Sat, 15 Aug 2020 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/08/why-i-stick-to-jekyll/</guid>
      <description>I am a big fan of Tex and asciidoc. Asciidoctor is ruby based and can been easily integrated into jekyll. Hugo currently still has some rough edges in asciidoc integration. Considering the time and effort to switch to Hugo, it is not worth to do that.
 </description>
    </item>
    
    <item>
      <title>run redux-saga examples</title>
      <link>https://jackliusr.github.io/posts/2020/07/run-redux-saga-examples/</link>
      <pubDate>Tue, 07 Jul 2020 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2020/07/run-redux-saga-examples/</guid>
      <description>run redux-saga examples TL;DR:
 yarn yarn build
 I run into module not found issues when I try to run those examples under the repository of redus-saga. Even following comments in github issues and stackoverflow, those solutions don’t work out.
 Scripts in the package.json of the root folder don’t work for examples.
 After run yarn &amp;amp;&amp;amp; yarn build, can change directories to those examples and run them.</description>
    </item>
    
    <item>
      <title>Workaround solution for inout refcursor parameters for stored procedure in postgresql 11 JDBC</title>
      <link>https://jackliusr.github.io/posts/2019/12/workaround-solution-for-inout-refcursor-parameters-for-stored-procedure-in-postgresql-11-jdbc/</link>
      <pubDate>Tue, 10 Dec 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/12/workaround-solution-for-inout-refcursor-parameters-for-stored-procedure-in-postgresql-11-jdbc/</guid>
      <description>The workaround solution mentioned at Issue doesn’t work when inout refcursor parameter is used.
 Here is my workaround solution for that.
 CREATE OR REPLACE PROCEDURE sp_test(INOUT results refcursor) LANGUAGE plpgsql SECURITY DEFINER AS $procedure$ begin results := &amp;#39;cur&amp;#39; ; OPEN results for select generate_series dt from generate_series(date&amp;#39;2019-01-01&amp;#39; , date&amp;#39;2019-01-31&amp;#39;, interval &amp;#39;1 day&amp;#39;); end;$procedure$ ;   conn.setAutoCommit(false); Statement st = conn.createStatement(); ResultSet rs0 = st.executeQuery(&amp;#34;call sp_test(&amp;#39;&amp;#39;)&amp;#34;); ResultSet rs = st.</description>
    </item>
    
    <item>
      <title>Error message of rabbitmq is terrible</title>
      <link>https://jackliusr.github.io/posts/2019/03/error-message-of-rabbitmq-is-terrible/</link>
      <pubDate>Tue, 12 Mar 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/03/error-message-of-rabbitmq-is-terrible/</guid>
      <description>Error message of rabbitmq is terrible Today I installed RabbitMQ 3.7.13-1. However I always got the following messages when running rabbitmq-server and a dump. The error message doesn’t give any clue of root cause. It is none of the cases searched from google such as permission issue, configuration issue etc.
 {&amp;#34;init terminating in do_boot&amp;#34;,{undef,[{rabbit_prelaunch,start,[],[]},{init,start_em,1,[]},{init,do_boot,3,[]}]}}   I re-read the installation guide and double-checked steps and configuration. There is no luck.</description>
    </item>
    
    <item>
      <title>Issues of clean setup spacemacs and their solutions</title>
      <link>https://jackliusr.github.io/posts/2019/02/issues-of-clean-setup-spacemacs-and-their-solutions/</link>
      <pubDate>Thu, 21 Feb 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/02/issues-of-clean-setup-spacemacs-and-their-solutions/</guid>
      <description>I encountered the same issue &amp;#34;File error: Cannot open load file, No such file or directory, bind-map&amp;#34; twice in my setup of spacemacs. The issue can be solved several ways which I found from github and clojurians-log.clojureverse.org. I consolidate the reasons and list them below.
   Timeout: the relevant setting in .spacemacs :- dotspacemacs-elpa-timeout 30
  TLS Certs: emacs --insecure
  Permanent TLS Certs: the relevant setting in .</description>
    </item>
    
    <item>
      <title>Chemical Bonding</title>
      <link>https://jackliusr.github.io/posts/2019/02/chemical-bonding/</link>
      <pubDate>Sat, 02 Feb 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/02/chemical-bonding/</guid>
      <description>Chemical Bonding The Stable Electronic configuration of a noble gas An outer electron or outermost electron is also known as valence electron. Only outer electrons are involved in chemical reactions.
 In what way do noble gases behave differently from other chemistry ? Noble gases are unreactive because they have fully filled outer shells, that is, they have duplet or octet electronic configuration.
 How do atom achieve the electronic configuration of a noble gas?</description>
    </item>
    
    <item>
      <title>Kinetic Particle Theory</title>
      <link>https://jackliusr.github.io/posts/2019/02/kinetic-particle-theory/</link>
      <pubDate>Fri, 01 Feb 2019 20:20:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/02/kinetic-particle-theory/</guid>
      <description>States of Matter Matter is substance that has mass and occupies space. All living and non-living things are matter.
 State of matter: solid, liquid, gas
     Property Solid Liquid Gas     Shape
 fixed
 not fixed
 not fixed
   Volume
 fixed
 fixed
 not fixed
   Compressibility
 Cannot be compressed
 cannot be compressed</description>
    </item>
    
    <item>
      <title>Math jax testing</title>
      <link>https://jackliusr.github.io/posts/2019/02/math-jax-testing/</link>
      <pubDate>Fri, 01 Feb 2019 20:10:10 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/02/math-jax-testing/</guid>
      <description>The difference of two squared numbers
 $ a^2 - b^2 = (a + b )(a - b) $
 </description>
    </item>
    
    <item>
      <title>Atomic Structure</title>
      <link>https://jackliusr.github.io/posts/2019/02/atomic-structure/</link>
      <pubDate>Fri, 01 Feb 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/02/atomic-structure/</guid>
      <description>Inside Atoms All matter is made up of atoms. Atoms are made up of subatomic particles: protons, neutrons and electrons.
 The protons and neutrons
   are tightly packed in the centre of an atom
  together from the nucleus of the atom.
   The electrons move rapidly around the nucleus.
     Subatomic particle Symbol Relative charge Relative mass     Inside the nucleus</description>
    </item>
    
    <item>
      <title>Integration of Klipse</title>
      <link>https://jackliusr.github.io/posts/2019/02/integration-of-klipse/</link>
      <pubDate>Fri, 01 Feb 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/02/integration-of-klipse/</guid>
      <description>(+ 1 2 3 4 5)   </description>
    </item>
    
    <item>
      <title>Twilio Call Status StateChart</title>
      <link>https://jackliusr.github.io/posts/2019/01/twilio-call-status-statechart/</link>
      <pubDate>Fri, 25 Jan 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/01/twilio-call-status-statechart/</guid>
      <description>I was not familiar with SIP states during the integration of VoIP products such as twilio, plivo and sinch. I am still confused about the state changes after reading documents. Here try to visualize the state change and help me to remember it. The state chart is based on my understanding. It is not necessarily correct. It is just for my reference.
 QueuedInitiatedRingingAnsweredInProgressCompletedBusyNoAnswerCanceledFailed   </description>
    </item>
    
    <item>
      <title>Unit 1: Experimental Chemistry</title>
      <link>https://jackliusr.github.io/posts/2019/01/unit-1-experimental-chemistry/</link>
      <pubDate>Sat, 19 Jan 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/01/unit-1-experimental-chemistry/</guid>
      <description>Measurement     Physical properties
 SI Units
 Other Common Units
 Common measuring apparatus
   Name
 Symbol
   time
 second
 s
   hour (h)
  minutes(min)
  day
     digital stopwatch
  analogue stopwatch
     mass
 kilogram
 kg
   gram(g)
  tonne(t)</description>
    </item>
    
    <item>
      <title>Asciidoc diagram  samples of UML</title>
      <link>https://jackliusr.github.io/posts/2019/01/asciidoc-diagram-samples-of-uml/</link>
      <pubDate>Fri, 11 Jan 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/01/asciidoc-diagram-samples-of-uml/</guid>
      <description>PlantUML Diagram Class diagram—​Relations between Class:
     Type
 Sysmbol
   Extension
 &amp;lt;!--
   Composition
 *--
   Aggregation
 o--
    Asciidoc UML sample
 Class01Class02Class03Class04Class05Class06Class07Class08Class09Class10   PlantUML sample
 Class01Class02Class03Class04Class05Class06Class07Class08Class09Class10     </description>
    </item>
    
    <item>
      <title>Asynchronization is hard to implement</title>
      <link>https://jackliusr.github.io/posts/2019/01/asynchronization-is-hard-to-implement/</link>
      <pubDate>Thu, 10 Jan 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/01/asynchronization-is-hard-to-implement/</guid>
      <description>Asynchronization is very hard. It brings benefits with several catches for backend programming. Here is serveral catches and respective solutions. However all those will increase the cost of developments.
   Hard to debug and trace As the process breaks down to serveral asynchronious subprocesses, it is very difficult to relate all information of the process when something goes wrong. An extra overhead correlation Id is needed to adopt to ameliorate this issue.</description>
    </item>
    
    <item>
      <title>Why I start to write again</title>
      <link>https://jackliusr.github.io/posts/2019/01/why-i-start-to-write-again/</link>
      <pubDate>Tue, 01 Jan 2019 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2019/01/why-i-start-to-write-again/</guid>
      <description>I read a lot of blogs. However I rarely wrote my blogs about my thoughts and learning experiences as I thought those are lack of originality.
 I changed my mind after I learned more than ten thousand words using anki and memrise in the past 2 years. A writing can serve multiple purposes even lack of originality and thorough thought. Here is a list of those purposes:
   Deepen my understanding in the topics and improve efficiency of learning</description>
    </item>
    
    <item>
      <title>Diagrams samples</title>
      <link>https://jackliusr.github.io/posts/2018/12/diagrams-samples/</link>
      <pubDate>Thu, 20 Dec 2018 20:00:00 +0800</pubDate>
      
      <guid>https://jackliusr.github.io/posts/2018/12/diagrams-samples/</guid>
      <description>Ditaa
 0 start1 q scans from start to end.....endrest of theallocated memory.....n    </description>
    </item>
    
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