Backupbot II: This Time It's Easily Configurable

Automatically take backups from running Docker Swarm services into a volume.

Background

There are lots of Docker volume backup systems; all of them have one or both of these problems:

• You need to define all the volumes to back up in the configuration system
• Backups require services to be stopped to take consistent copies

Backupbot II tries to solve these problems by letting you define how to back up your services using Docker labels, so you can easily collect your backups for use with another system like docker-volume-backup.

Deployment

With Co-op Cloud

1. Set up Docker Swarm and abra
2. abra app new backup-bot-two
3. abra app config <your-app-name>, and set storage options. Either configure CRON_SCHEDULE, or set up swarm-cronjob
4. abra app secret generate <your-app-name> restic-password v1, optionally with --pass before <your-app-name> to save the generated secret in pass.
5. abra app secret insert <your-app-name> ssh-key v1 ... or similar, to load required secrets.
6. abra app deploy <your-app-name>

Configuration

Like Traefik, or swarm-cronjob, Backupbot II uses access to the Docker socket to read labels from running Docker Swarm services:

services:
  db:
    deploy:
      labels:
        backupbot.backup: "true"
        backupbot.backup.pre-hook: 'mysqldump -u root -p"$(cat /run/secrets/db_root_password)" -f /tmp/dump/dump.db'
        backupbot.backup.post-hook: "rm -rf /tmp/dump/dump.db"
        backupbot.backup.path: "/tmp/dump/"

• backupbot.backup -- set to true to back up this service (REQUIRED)
• backupbot.backup.path -- file path within the service to copy (REQUIRED)
• backupbot.backup.pre-hook -- command to run before copying files (optional)
• backupbot.backup.post-hook -- command to run after copying files (optional)

As in the above example, you can reference Docker Secrets, e.g. for looking up database passwords, by reading the files in /run/secrets directly.

Development

1. Install direnv
2. cp .envrc.sample .envrc
3. Edit .envrc as appropriate, including setting DOCKER_CONTEXT to a remote Docker context, if you're not running a swarm server locally.
4. Run ./backup.sh -- you can add the --skip-backup or --skip-upload options if you just want to test one other step