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docker-db-auto-backup

A script to automatically back up all databases running under docker on a host, with optional compression support.

Supported databases

  • MariaDB
  • MySQL
  • PostgreSQL
  • Redis

Installation

This container requires access to the docker socket. This can be done either by mounting /var/lib/docker.sock, or using a HTTP proxy to provide it through $DOCKER_HOST.

Mount your backup directory as /var/backups (or override $BACKUP_DIR). Backups will be saved here based on the name of the container. Backups are not dated or compressed.

Backups run daily at midnight. To change this, add a cron-style schedule to $SCHEDULE. For more information on the format of the cron strings, please see the croniter documentation on PyPI.

Success hooks

When backups are completed successfully, a request can be made to the URL defined in $SUCCESS_HOOK_URL. By default, a GET request is made. To include logs, also set $INCLUDE_LOGS to a non-empty value, which sends a POST request instead with helpful details in the body.

Note: Previous versions also supported $HEALTHCHECKS_ID, $HEALTHCHECKS_HOST and $UPTIME_KUMA_URL, or native support for healthchecks.io and Uptime Kuma respectively. These are all still supported, however $SUCCESS_HOOK_URL is preferred.

Compression

Files are backed up uncompressed by default, on the assumption a snapshotting or native compressed filesystem is being used (eg ZFS). To enable compression, set $COMPRESSION to one of the supported algorithms:

  • gzip
  • lzma / xz
  • bz2
  • plain (no compression - the default)

Example docker-compose.yml

version: "2.3"

services:
  backup:
    image: ghcr.io/realorangeone/db-auto-backup:latest
    restart: unless-stopped
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      - ./backups:/var/backups
    environment:
      - SUCCESS_HOOK_URL=https://hc-ping.com/1234
      - INCLUDE_LOGS=true

Oneshot

You may want to use this container to run backups just once, rather than on a schedule. To achieve this, set $SCHEDULE to an empty string, and the backup will run just once. This may be useful in conjunction with an external scheduler.