Run mysqldump to backup your databases periodically using the cron task manager in the container. Your backups are saved in /backup
. You can mount any directory of your host or a docker volumes in /backup. Othwerwise, a docker volume is created in the default location.
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
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_PASS_FILE
: The file in container where to find the password of your mysql database (cf. docker secrets). You should use either MYSQL_PASS_FILE or MYSQL_PASS (see examples below).MYSQL_DATABASE
: The database name to dump. Default:--all-databases
.MYSQLDUMP_OPTS
: Command line arguments to pass to mysqldump (see mysqldump documentation).CRON_TIME
: The interval of cron job to run mysqldump.0 3 * * sun
by default, which is every Sunday at 03:00. It uses UTC timezone.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.GZIP_LEVEL
: Specify the level of gzip compression from 1 (quickest, least compressed) to 9 (slowest, most compressed), default is 6.USE_PLAIN_SQL
: If set, back up and restore plain SQL files without gzip.TZ
: Specify TIMEZONE in Container. E.g. "Europe/Berlin". Default is UTC.
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:
- data:/var/lib/mysql
# 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}
restart: unless-stopped
mysql-cron-backup:
image: fradelg/mysql-cron-backup
depends_on:
- 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 * * *
# Make it small
- GZIP_LEVEL=9
restart: unless-stopped
volumes:
data:
The database root password passed to docker container by using docker secrets.
In example below, docker is in classic 'docker engine mode' (iow. not swarm mode) and secret source is a local file on host filesystem.
Alternatively, secret can be stored in docker secrets engine (iow. not in host filesystem).
version: "3.7"
secrets:
mysql_root_password:
# Place your secret file somewhere on your host filesystem, with your password inside
file: ./secrets/mysql_root_password
services:
mariadb:
image: mariadb:10
container_name: my_mariadb
expose:
- 3306
volumes:
- data:/var/lib/mysql
- ${VOLUME_PATH}/backup:/backup
environment:
- MYSQL_DATABASE=${DATABASE_NAME}
- MYSQL_ROOT_PASSWORD_FILE=/run/secrets/mysql_root_password
secrets:
- mysql_root_password
restart: unless-stopped
backup:
build: .
image: fradelg/mysql-cron-backup
depends_on:
- mariadb
volumes:
- ${VOLUME_PATH}/backup:/backup
environment:
- MYSQL_HOST=my_mariadb
- MYSQL_USER=root
- MYSQL_PASS_FILE=/run/secrets/mysql_root_password
- MAX_BACKUPS=10
- INIT_BACKUP=1
- CRON_TIME=0 0 * * *
secrets:
- mysql_root_password
restart: unless-stopped
volumes:
data:
See the list of backups in your running docker container, just write in your favorite terminal:
docker container exec <your_mysql_backup_container_name> ls /backup
To restore a database from a certain backup you may have to specify the database name in the variable MYSQL_DATABASE:
mysql-cron-backup:
image: fradelg/mysql-cron-backup
command: "/restore.sh /backup/201708060500.${DATABASE_NAME}.sql.gz"
depends_on:
- mariadb
volumes:
- ${VOLUME_PATH}/backup:/backup
environment:
- MYSQL_HOST=my_mariadb
- MYSQL_USER=root
- MYSQL_PASS=${MARIADB_ROOT_PASSWORD}
- MYSQL_DATABASE=${DATABASE_NAME}
docker container exec <your_mysql_backup_container_name> /restore.sh /backup/<your_sql_backup_gz_file>
if no database name is specified, restore.sh
will try to find the database name from the backup file.