Allow to backup by means of ftp

Dockerfile

@@ -1,7 +1,7 @@
 FROM ubuntu:18.04
 
 RUN apt-get update \
- && apt-get install -y --no-install-recommends curl cron ca-certificates openssh-client iputils-ping unzip \
+ && apt-get install -y --no-install-recommends curl cron ca-certificates ncftp openssh-client iputils-ping unzip \
  && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 # Install awscliv2 https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2-linux.html

README.md

@@ -4,7 +4,7 @@ Docker image for performing simple backups of Docker volumes. Main features:
 
 - Mount volumes into the container, and they'll get backed up
 - Use full `cron` expressions for scheduling the backups
-- Backs up to local disk, to remote host available via `scp`, to [AWS S3](https://aws.amazon.com/s3/), or to all of them
+- Backs up to local disk, to remote host available via `scp` or `ftp`, to [AWS S3](https://aws.amazon.com/s3/), or to all of them
 - Allows triggering a backup manually if needed
 - Optionally stops containers for the duration of the backup, and starts them again afterward, to ensure consistent backups
 - Optionally `docker exec`s commands before/after backing up a container, to allow easy integration with database backup tools, for example
@@ -248,6 +248,11 @@ Variable | Default | Notes
 `SCP_DIRECTORY` |  | Directory on `SCP_HOST` where backup file is stored.
 `PRE_SCP_COMMAND` |  | Commands that is executed on `SCP_HOST` before the backup is transferred.
 `POST_SCP_COMMAND` |  | Commands that is executed on `SCP_HOST` after the backup has been transferred.
+`FTP_HOST` |  | When provided, the resulting backup file will be uploaded by means of `ftp` to the host stated.
+`FTP_PORT` | 21 | Port, on which the host stated above is listening.
+`FTP_USER` |  | User name to log into `FTP_HOST`.
+`FTP_PASS` |  | Password to log into `FTP_HOST`.
+`FTP_DIRECTORY` |  | Directory on `FTP_HOST` where backup file is stored.
 `GPG_PASSPHRASE` |  | When provided, the backup will be encrypted with gpg using this `passphrase`.
 `INFLUXDB_URL` |  | When provided, backup metrics will be sent to an InfluxDB instance at this URL, e.g. `https://influxdb.example.com`.
 `INFLUXDB_DB` |  | Required when using `INFLUXDB_URL`; e.g. `my_database`.

src/backup.sh

@@ -119,6 +119,13 @@ if [ ! -z "$AWS_GLACIER_VAULT_NAME" ]; then
   TIME_UPLOADED="$(date +%s.%N)"
 fi
 
+if [ ! -z "$FTP_HOST" ]; then
+  info "Uploading backup by means of FTP"
+  echo "Will upload to $FTP_HOST:$FTP_DIRECTORY"
+  eval ncftpput -V -u $FTP_USER -p $FTP_PASS -P $FTP_PORT $FTP_HOST $FTP_DIRECTORY $BACKUP_FILENAME
+  echo "Upload finished"
+fi
+
 if [ ! -z "$SCP_HOST" ]; then
   info "Uploading backup by means of SCP"
   SSH_CONFIG="-o StrictHostKeyChecking=no -i /ssh/id_rsa"

src/entrypoint.sh

@@ -17,6 +17,11 @@ SCP_USER="${SCP_USER:-}"
 SCP_DIRECTORY="${SCP_DIRECTORY:-}"
 PRE_SCP_COMMAND="${PRE_SCP_COMMAND:-}"
 POST_SCP_COMMAND="${POST_SCP_COMMAND:-}"
+FTP_HOST="${FTP_HOST:-}"
+FTP_PORT="${FTP_PORT:-21}"
+FTP_USER="${FTP_USER:-}"
+FTP_PASS="${FTP_PASS:-}"
+FTP_DIRECTORY="${FTP_DIRECTORY:-}"
 BACKUP_FILENAME=${BACKUP_FILENAME:-"backup-%Y-%m-%dT%H-%M-%S.tar.gz"}
 BACKUP_ARCHIVE="${BACKUP_ARCHIVE:-/archive}"
 BACKUP_UID=${BACKUP_UID:-0}

test/backing-up-via-ftp/docker-compose.yml

@@ -0,0 +1,22 @@
+
+version: "3"
+
+services:
+
+  dashboard:
+    image: grafana/grafana:7.4.5
+    volumes:
+      - grafana-data:/var/lib/grafana           # This is where Grafana keeps its data
+
+  backup:
+    build: ../..
+    environment:
+      FTP_HOST: 192.168.0.42                    # Remote host IP address
+      FTP_USER: pi                              # Remote host user to log in
+      FTP_PASS: supersecret                     # Remote host password to log in
+      FTP_DIRECTORY: /home/pi/backups           # Remote host directory
+    volumes:
+      - grafana-data:/backup/grafana-data:ro    # Mount the Grafana data volume (as read-only)
+
+volumes:
+  grafana-data: