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restic-compose-backup

docs

Backup using restic for a docker-compose setup. Currently tested with docker-ce 17, 18 and 19.

Features:

  • Backs up docker volumes or host binds
  • Backs up postgres, mariadb and mysql databases
  • Notifications over mail/smtp or Discord webhooks

Please report issus on github.

Install

docker pull zettaio/restic-compose-backup

Configuration (env vars)

Minimum configuration

RESTIC_REPOSITORY
RESTIC_PASSWORD

More config options can be found in the documentation.

Restic backend specific env vars : https://restic.readthedocs.io/en/stable/040_backup.html#environment-variables

Compose Example

We simply control what should be backed up by adding labels to our containers. More details are covered in the documentation.

restic-backup.env

RESTIC_REPOSITORY=<whatever backend restic supports>
RESTIC_PASSWORD=hopefullyasecturepw
# snapshot prune rules
RESTIC_KEEP_DAILY=7
RESTIC_KEEP_WEEKLY=4
RESTIC_KEEP_MONTHLY=12
RESTIC_KEEP_YEARLY=3
# Cron schedule. Run every day at 1am
CRON_SCHEDULE="0 1 * * *"

docker-compose.yaml

version: '3'
services:
  # The backup service
  backup:
    image: zettaio/restic-compose-backup:<version>
    env_file:
      - restic-backup.env
    volumes:
      # We need to communicate with docker
      - /var/run/docker.sock:/tmp/docker.sock:ro
      # Persistent storage of restic cache (greatly speeds up all restic operations)
      - cache:/cache
  web:
    image: some_image
    labels:
      # Enables backup of the volumes below
      restic-compose-backup.volumes: true
    volumes:
      - media:/srv/media
      - /srv/files:/srv/files
  mariadb:
    image: mariadb:10
    labels:
      # Enables backup of this database
      restic-compose-backup.mariadb: true
    env_file:
      mariadb-credentials.env
    volumes:
      - mysqldata:/var/lib/mysql
  mysql:
    image: mysql:5
    labels:
      # Enables backup of this database
      restic-compose-backup.mysql: true
    env_file:
      mysql-credentials.env
    volumes:
      - mysqldata:/var/lib/mysql

  postgres:
    image: postgres
    labels:
      # Enables backup of this database
      restic-compose-backup.postgres: true
    env_file:
      postgres-credentials.env
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  media:
  mysqldata:
  mariadbdata:
  pgdata:
  cache:

The rcb command

Everything is controlled using the rcb command. After configuring backup with labels and restarted the affected services we can quickly view the result using the status subcommand.

$ docker-compose run --rm backup rcb status
INFO: Status for compose project 'myproject'
INFO: Repository: '<restic repository>'
INFO: Backup currently running?: False
INFO: --------------- Detected Config ---------------
INFO: service: mysql
INFO:  - mysql (is_ready=True)
INFO: service: mariadb
INFO:  - mariadb (is_ready=True)
INFO: service: postgres
INFO:  - postgres (is_ready=True)
INFO: service: web
INFO:  - volume: media
INFO:  - volume: /srv/files

The status subcommand lists what will be backed up and even pings the database services checking their availability. The restic command can also be used directly in the container.

More rcb commands can be found in the documentation.

Running Tests

pip install -e ./src/
pip install -r src/tests/requirements.txt
tox

Building Docs

pip install -r docs/requirements.txt
python src/setup.py build_sphinx

Local dev setup

The git repository contains a simple local setup for development

# Create an overlay network to link the compose project and stack
docker network create --driver overlay --attachable global
# Start the compose project
docker-compose up -d
# Deploy the stack
docker stack deploy -c swarm-stack.yml test

In dev we should ideally start the backup container manually

docker-compose run --rm backup sh
# pip install the package in the container in editable mode to auto sync changes from host source
pip3 install -e .

Remember to enable swarm mode with docker swarm init/join and disable swarm mode with docker swarm leave --force when needed in development (single node setup).

Contributing

Contributions are welcome regardless of experience level. Don't hesitate submitting issues, opening partial or completed pull requests.

This project is sponsored by zetta.io

Zetta.IO