Zero-Fuss Docker Database Backup

A simple tool to create backup of all databases on a host. Supports postgres and mysql/mariadb.

Successor to this script.

Usage

Simply point it at your docker socket, mount a backup volume and be done:

docker run -v $PWD/backups:/backups -v /var/run/docker.sock:/var/run/docker.sock kolaente/db-backup

The tool will find all database containers running an official mysql, mariadb or postgres image and create backups of them periodically. It will also discover new containers as they are started and won't try to back up containers which have gone away.

When running, all backups for the current run are time-stamped into a sub folder of the backup directory (see below).

Using labels

To make the backup tool discover other non-offical containers as well you can add the label de.kolaente.db-backup to any container with a value of mysql or postgres to treat it as a mysql or postgres container.

Docker Compose

If you're running docker-compose, you can use a setup similar to the following compose file to run the backup:

version: '2'
services:
  backup:
    image: kolaente/db-backup
    restart: unless-stopped
    volumes:
      - ./backups:/backups
      - /etc/localtime:/etc/localtime:ro
      - /var/run/docker.sock:/var/run/docker.sock

Config

All config is done with environment variables.

BACKUP_FOLDER

Where all backup files will be stored.

Default: /backups

BACKUP_SCHEDULE

The cron schedule at which the backup job runs, using the common unix cron syntax.

Check out crontab.dev for a nice explanation of the schedule.

Default: 0 */6 * * * (every 6 hours)

BACKUP_NO_CRON

If provided, runs the backup only once without a cron schedule. This is useful for one-off backups of testing if the configuration works.

Default: false

BACKUP_MAX

How many backups to keep. If more backups are stored in the backup folder, the oldest one will be removed until there are only as many as this config variable.

Default: 12

BACKUP_COMPLETION_WEBHOOK_URL

If provided, the tool will do an empty GET request to this URL to indicate it successfully completed the backup job. You can use this with other tools to monitor if backups are completed as they should.

BACKUP_COMPRESS

If set provided and set to true, all backups will be compressed using gzip.

Building from source

This project uses go modules, so you'll need at least go 1.11 to compile it.

Simply run

go build .

to build the binary.