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Differences from the official mariadb

This image can create arbitrary amount of databases on startup.

Supported tags and respective Dockerfile links

For more information about this image and its history, please see the relevant manifest file (library/mariadb) in the docker-library/official-images GitHub repo.

What is MariaDB?

MariaDB is a community-developed fork of the MySQL relational database management system intended to remain free under the GNU GPL. Being a fork of a leading open source software system, it is notable for being led by the original developers of MySQL, who forked it due to concerns over its acquisition by Oracle. Contributors are required to share their copyright with the MariaDB Foundation.

The intent is also to maintain high compatibility with MySQL, ensuring a "drop-in" replacement capability with library binary equivalency and exact matching with MySQL APIs and commands. It includes the XtraDB storage engine for replacing InnoDB, as well as a new storage engine, Aria, that intends to be both a transactional and non-transactional engine perhaps even included in future versions of MySQL.

wikipedia.org/wiki/MariaDB

How to use this image

start a mariadb server instance

docker run --name some-mariadb -e MYSQL_ROOT_PASSWORD=mysecretpassword -d mariadb

This image includes EXPOSE 3306 (the standard MySQL port), so container linking will make it automatically available to the linked containers (as the following examples illustrate).

connect to it from an application

Since MariaDB is intended as a drop-in replacement for MySQL, it can be used with many applications.

docker run --name some-app --link some-mariadb:mysql -d application-that-uses-mysql

... or via mysql

docker run -it --link some-mariadb:mysql --rm mariadb sh -c 'exec mysql -h"$MYSQL_PORT_3306_TCP_ADDR" -P"$MYSQL_PORT_3306_TCP_PORT" -uroot -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD"'

Environment Variables

The mariadb image uses several environment variables which are easy to miss. While not all the variables are required, they may significantly aid you in using the image.

The variable names are prefixed with MYSQL_ since the binary is mysqld, and since the intention is to be a drop-in replacement for MySQL, as mentioned above.

MYSQL_ROOT_PASSWORD

This is the one environment variable that is required. This environment variable should be what you want to set the password for the root user to be. In the above example, it is being set to "mysecretpassword".

MYSQL_USER, MYSQL_PASSWORD

These optional environment variables are used in conjunction to both create a new user and set that user's password, which will subsequently be granted all permissions for the database specified by the optional MYSQL_DATABASES variable. Note that if you only have one of these two environment variables, then neither will do anything -- these two are required to be used in conjunction with one another.

Additionally, there is no need to specify MYSQL_USER with root, as the root user already exists by default, and the password of that user is controlled by MYSQL_ROOT_PASSWORD (see above).

MYSQL_DATABASES

This optional environment variable denotes a list of names of databases to create. If a user/password was supplied (via the MYSQL_USER and MYSQL_PASSWORD environment variables) then that user will be granted (via GRANT ALL) access to this database. The list is space separated, so keep that in mind when deciding on database names.

Caveats

If there is no database initialized when the container starts, then a default database will be created. While this is the expected behavior, this means that it will not accept incoming connections until such initialization completes. This may cause issues when using automation tools, such as docker-compose, which start several containers simultaneously.

Supported Docker versions

This image is officially supported on Docker version 1.7.1.

Support for older versions (down to 1.0) is provided on a best-effort basis.

User Feedback

Documentation

Documentation for this image is stored in the mariadb/ directory of the docker-library/docs GitHub repo. Be sure to familiarize yourself with the repository's README.md file before attempting a pull request.

Issues

If you have any problems with or questions about this image, please contact us through a GitHub issue.

You can also reach many of the official image maintainers via the #docker-library IRC channel on Freenode.

Contributing

You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.

Before you start to code, we recommend discussing your plans through a GitHub issue, especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give you feedback on your design, and help you find out if someone else is working on the same thing.

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