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A Dockerfile that produces a container that will run MariaDB 10.0.22,
a drop-in replacement for MySQL.

Image Creation

This example creates the image with the tag boggart/mariadb, but you can
change this to use your own username.

$ docker build -t="boggart/mariadb" .

Alternately, you can run the following if you have make installed...

$ make

You can also specify a custom docker username like so:

$ make DOCKER_USER=boggart

Container Creation / Running

The MariaDB server is configured to store data in /data inside the container.
You can map the container's /data volume to a volume on the host so the data
becomes independant of the running container.

This example uses /tmp/mariadb to store the MariaDB data, but you can modify
this to your needs.

When the container runs, it creates a superuser with a random password. You
can set the username and password for the superuser by setting the container's
environment variables. This lets you discover the username and password of the
superuser from within a linked container or from the output of docker inspect mariadb.

$ mkdir -p /tmp/mariadb
$ docker run -d -name="mariadb" \
             -p \
             -v /tmp/mariadb:/data \
             -e USER="super" \
             -e PASS="$(pwgen -s -1 16)" \

Alternately, you can run the following if you have make installed...

$ make run

You can also specify a custom port to bind to on the host, a custom data
directory, and the superuser username and password on the host like so:

$ sudo mkdir -p /srv/docker/mariadb
$ make run PORT= \
           DATA_DIR=/srv/docker/mariadb \
           USER=super \
           PASS=$(pwgen -s -1 16)

Connecting to the Database

To connect to the MariaDB server, you will need to make sure you have a client.
You can install the mysql-client on your host machine by running the
following (Ubuntu 12.04LTS):

$ sudo apt-get install mysql-client

As part of the startup for MariaDB, the container will generate a random
password for the superuser. To view the login in run `docker logs

<container_name>` like so:

$ docker logs mariadb
Starting MariaDB...
140103 20:33:49 mysqld_safe Logging to '/data/mysql.log'.
140103 20:33:49 mysqld_safe Starting mysqld daemon with databases from /data

Then you can connect to the MariaDB server from the host with the following

$ mysql -u super --password=FzNQiroBkTHLX7y4 --protocol=tcp

Linking with the Database Container

You can link a container to the database container. You may want to do this to
keep web application processes that need to connect to the database in
a separate container.

To demonstrate this, we can spin up a new container like so:

$ docker run -t -i -link mariadb:db ubuntu bash

This assumes you're already running the database container with the name
mariadb. The -link mariadb:db will give the linked container the alias
db inside of the new container.

From the new container you can connect to the database by running the following

$ apt-get install -y mysql-client
$ mysql -u "$DB_ENV_USER" --password="$DB_ENV_PASS" -h "$DB_PORT_3306_TCP_ADDR" -P "$DB_PORT_3306_TCP_PORT"

If you ran the mariadb container with the flags -e USER=<user> and -e PASS=<pass>, then the linked container should have these variables available
in its environment. Since we aliased the database container with the name
db, the environment variables from the database container are copied into the
linked container with the prefix DB_ENV_.

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