This Dockerfile has full test coverage. You can run the specs through bin/spec. A caveat is that some of these specs rely on boot2docker. This is due to this container being developed on OS X. Before running the spec do bundle install and docker pull klevo/test_mysql_master.

To run a container with a mysql data dir mounted for persistence:

docker run -d --name percona \
  -v /home/docker/percona-data:/var/lib/mysql \
  -e MYSQL_ROOT_PASSWORD=mypass \
  -p 3308:3306 \
  klevo/percona

Percona XtraBackup included. To do a hot backup on a running container:

docker exec -i -t percona innobackupex /backups
docker exec -i -t percona innobackupex --apply-log /backups/2014-12-16_14-44-35

This container includes autossh which creates a tunnel to the master server if the below env variables are specified. The master must have a tunnels user account available which is reacheable through ssh with the slave's private key, which is mounted in the example below. Run a container with replication enabled like this:

docker run -d --name db1_slave \
  -v /home/docker/percona-data:/var/lib/mysql \
  -v /tunnels_id_rsa:/tunnels_id_rsa \
  -e MYSQL_ROOT_PASSWORD=mypass \
  -e REPLICATION_SLAVE_MASTER_HOST=someip \
  -e REPLICATION_SLAVE_REMOTE_PORT=3306 \
  -e REPLICATION_SLAVE_USER=slave_db1 \
  -e REPLICATION_SLAVE_PASSWORD=slaveuserpass \
  -p 3308:3306 \
  klevo/percona

Then get the SQL for master to set up the replication:

docker exec -i -t db1_slave replication_master_sql

outputs something like:

GRANT REPLICATION SLAVE ON *.* TO 'slave_db1'@'localhost' IDENTIFIED BY 'slaveuserpass';

Finally start replication on the slave (execute this once master was configured with the above sql):

docker exec -i -t db1_slave start_replication mysql-bin.000001 107

Runs something like this in the background on the slave container:

STOP SLAVE;
CHANGE MASTER TO MASTER_HOST='127.0.0.1', MASTER_USER='slave_db1', MASTER_PASSWORD='slaveuserpass', MASTER_PORT=3307, MASTER_LOG_FILE='mysql-bin.000001', MASTER_LOG_POS=107;
START SLAVE;

This was fun to write a spec for :)

If you want to test the replication over the ssh tunnel with two docker containers, use my testing image: klevo/test_mysql_master and check the README.