docker-rdiff-backup

- Latest version: rdiff-backup 2.0.0
- Note that 2.0.0 is not compatible with previous server versions so must update both client and server side at the same time.

Docker container with ssh and rdiff-backup to use as a backup solution. I use it to back up a remote host to a local NAS (but you can do remote-to-remote or local-to-remote as well, just need rdiff-backup on each side).

Mount your volumes from host into this container. I suggest something simple like /bckp/dir1, /bckp/dir2/dir2_subdir etc. You may also need to expose a port that is different than 22 (e.g. if you're running through a reverse proxy). In that case, you will want to specify a remote-schema for your rdiff-backup like so:

rdiff-backup -v5 --print-statistics --remote-schema "ssh -C -p7777 %s rdiff-backup --server" alpine@server.com::/bckp /local/storage/dir

Here's a full docker-compose snippet that exposes more options:

  rdiffbckp:
    image: achaiah/docker-rdiff-backup
    container_name: rdiffbckp
    restart: always
    environment:
      - CNTUSER=alpine
      - CNTPASS=insecurebydefault
      - ROOTPASS=insecurebydefaultroot
      - PGID=1000
      - PUID=1000
    volumes:
       - /nginx:/bckp/nginx
       - /data:/bckp/data
       - /app:/bckp/app
    ports:
      - "7777:22"

Security

It is generally a bad idea to use login/password so instead you should use rsa keys. For that you will need to:

1. Generate public/private key pair
2. [Disable password-based logins (see Step 4)
3. Mount your modified sshd_config as well as your authorized_keys inside the container so they don't get wiped when your container is re-created Your volumes: section might look like this:

volumes:
    - /nginx:/bckp/nginx
    - /data:/bckp/data
    - /app:/bckp/app
    - /rdiff/authorized_keys:/etc/ssh/sshd_config
    - /rdiff/.ssh/authorized_keys:/home/alpine/.ssh/authorized_keys

Finally, you'll want to make sure you reference the rsa file when calling rdiff-backup:

rdiff-backup -v5 --print-statistics --remote-schema "ssh -i /somedir/my_rsa -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -C -p7777 %s rdiff-backup --server" alpine@server.com::/bckp /local/storage/dir