docker-mysql-cron-backup/README.md

mysql-cron-backup

This docker image runs mysqldump to backup your databases periodically using cron task manager. Backups are placed in /backup so you can mount your backup docker volume in this path.

Usage:

docker container run -d \
       --env MYSQL_USER=root \
       --env MYSQL_PASS=my_password \
       --link mysql
       --volume /path/to/my/backup/folder:/backup
       fradelg/mysql-cron-backup

Variables

• MYSQL_HOST: The host/ip of your mysql database.
• MYSQL_PORT: The port number of your mysql database.
• MYSQL_USER: The username of your mysql database.
• MYSQL_PASS: The password of your mysql database.
• MYSQL_DB: The database name to dump. Default: --all-databases.
• MYSQLDUMP_OPTS: Command line arguments to pass to mysqldump. Example: --single-transaction.
• CRON_TIME: The interval of cron job to run mysqldump. 0 3 * * sun by default, which is every Sunday at 03:00.
• MAX_BACKUPS: The number of backups to keep. When reaching the limit, the old backup will be discarded. No limit by default.
• INIT_BACKUP: If set, create a backup when the container starts.
• INIT_RESTORE_LATEST: If set, restores latest backup.
• TIMEOUT: Wait a given number of seconds for the database to be ready and make the first backup, 10s by default. After that time, the initial attempt for backup gives up and only the Cron job will try to make a backup.

If you want to make this image the perfect companion of your MySQL container, use docker-compose. You can add more services that will be able to connect to the MySQL image using the name my_mariadb, note that you only expose the port 3306 internally to the servers and not to the host:

version: "2"
services:
  mariadb:
    image: mariadb
    container_name: my_mariadb
    expose:
      - 3306
    volumes:
      # If there is not scheme, restore the last created backup (if exists)
      - ${VOLUME_PATH}/backup/latest.${DATABASE_NAME}.sql.gz:/docker-entrypoint-initdb.d/database.sql.gz
    environment:
      - MYSQL_ROOT_PASSWORD=${MARIADB_ROOT_PASSWORD}
      - MYSQL_DATABASE=${DATABASE_NAME}
      - MYSQL_USER=${WORDPRESS_DB_USER}
      - MYSQL_PASSWORD=${WORDPRESS_DB_PASSWORD}
    restart: unless-stopped

  mysql-cron-backup:
    image: fradelg/mysql-cron-backup
    depends_on:
      - my_mariadb
    volumes:
      - ${VOLUME_PATH}/backup:/backup
    environment:
      - MYSQL_HOST=my_mariadb
      - MYSQL_USER=root
      - MYSQL_PASS=${MARIADB_ROOT_PASSWORD}
      - MAX_BACKUPS=15
      - INIT_BACKUP=0
      # Every day at 03:00
      - CRON_TIME=0 3 * * *
    restart: unless-stopped

Restore from a backup

See the list of backups in your running docker container, just write in your favorite terminal:

docker container exec backup ls /backup

To restore a database from a certain backup, simply run:

docker container exec backup /restore.sh /backup/201708060500.my_db.sql.gz