assignment_solution.md

Solution for Assignment

See get_db() in application main.py for necessary environment values. We need to provide REDIS_HOST and REDIS_PASSWORD

For Redis helm chart see: https://github.com/bitnami/charts/tree/master/bitnami/redis

kubectl create ns redis-ns

helm repo add bitnami https://charts.bitnami.com/bitnami
helm install -n redis-ns redis bitnami/redis

# check redis service name, if redis is in the same namespace as myapp we can use Kubernetes DNS to resolve this name as domain to IP
kubectl get service

# to obtain password for redis
kubectl get secret --namespace redis-ns redis -o jsonpath="{.data.redis-password}" | base64 --decode

# add to values.yaml
db:
  useRedis: true
  redisHost: 'redis-master'
  redisPassword: '<PASSWORD>'

# add to secrets in config.yaml
redis_password: {{.Values.db.redisPassword | b64enc}}

# add to env in deployment.yaml
{{- if .Values.db.useRedis}}
- name: REDIS_HOST
  value: {{.Values.db.redisHost | quote}}
- name: REDIS_PASSWORD
  valueFrom:
    secretKeyRef:
      name: {{.Values.config.secretKeyRef}}
      key: redis_password
{{- end}}

helm install -n redis-ns myapp-helm ./myapp/chart

Use kubectl get, kubectl describe to see if service is running.

Check your solution

Start port forwarding for your service. Then try:

curl 'http://localhost:8080/ready?connections_check=1'

should output:

{
  "message": "I am ready and connected"
}

curl -X POST 'http://localhost:8080/guests?guest=Greg'

should output:

{
  "status": "ok"
}

curl 'http://localhost:8080/guests'

should output:

{
  "guest": "Greg"
}