MySQL Docker image
How to use this image
mysql server instance
Starting a MySQL instance is simple:
$ docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d healthcareblocks/mysql:tag
some-mysql is the name you want to assign to your container,
my-secret-pw is the password to be set for the MySQL root user and
tag is the tag specifying the MySQL version you want.
Connect to MySQL from an application in another Docker container
This image exposes the standard MySQL port (3306), so container linking makes the MySQL instance available to other application containers. Start your application container like this in order to link it to the MySQL container:
$ docker run --name some-app --link some-mysql:mysql -d application-that-uses-mysql
Connect to MySQL from the MySQL command line client
The following command starts another mysql container instance and runs the
mysql command line client against your original mysql container, allowing you to execute SQL statements against your database instance:
$ docker run -it --link some-mysql:mysql --rm healthcareblocks/mysql sh -c 'exec mysql -h"$MYSQL_PORT_3306_TCP_ADDR" -P"$MYSQL_PORT_3306_TCP_PORT" -uroot -p"$MYSQL_ENV_MYSQL_ROOT_PASSWORD"'
some-mysql is the name of your original mysql container.
More information about the MySQL command line client can be found in the MySQL documentation
Container shell access and viewing MySQL logs
docker exec command allows you to run commands inside a Docker container. The following command line will give you a bash shell inside your
$ docker exec -it some-mysql bash
The MySQL Server log is available through Docker's container log:
$ docker logs some-mysql
Using a custom MySQL configuration file
The MySQL startup configuration is specified in the file
/etc/mysql/my.cnf, and that file in turn includes any files found in the
/etc/mysql/conf.d directory that end with
.cnf. Settings in files in this directory will augment and/or override settings in
/etc/mysql/my.cnf. If you want to use a customized MySQL configuration, you can create your alternative configuration file in a directory on the host machine and then mount that directory location as
/etc/mysql/conf.d inside the
/my/custom/config-file.cnf is the path and name of your custom configuration file, you can start your
mysql container like this (note that only the directory path of the custom config file is used in this command):
$ docker run --name some-mysql -v /my/custom:/etc/mysql/conf.d -e MYSQL_ROOT_PASSWORD=my-secret-pw -d healthcareblocks/mysql:tag
This will start a new container
some-mysql where the MySQL instance uses the combined startup settings from
/etc/mysql/conf.d/config-file.cnf, with settings from the latter taking precedence.
Note that users on host systems with SELinux enabled may see issues with this. The current workaround is to assign the relevant SELinux policy type to your new config file so that the container will be allowed to mount it:
$ chcon -Rt svirt_sandbox_file_t /my/custom
When you start the
mysql image, you can adjust the configuration of the MySQL instance by passing one or more environment variables on the
docker run command line. Do note that none of the variables below will have any effect if you start the container with a data directory that already contains a database: any pre-existing database will always be left untouched on container startup.
This variable is mandatory and specifies the password that will be set for the MySQL
root superuser account. In the above example, it was set to
This variable is optional and allows you to specify the name of a database to be created on image startup. If a user/password was supplied (see below) then that user will be granted superuser access (corresponding to
GRANT ALL) to this database.
These variables are optional, used in conjunction to create a new user and to set that user's password. This user will be granted superuser permissions (see above) for the database specified by the
MYSQL_DATABASE variable. Both variables are required for a user to be created.
Do note that there is no need to use this mechanism to create the root superuser, that user gets created by default with the password specified by the
This is an optional variable. Set to
yes to allow the container to be started with a blank password for the root user. NOTE: Setting this variable to
yes is not recommended unless you really know what you are doing, since this will leave your MySQL instance completely unprotected, allowing anyone to gain complete superuser access.
Initializing a fresh instance
When a container is started for the first time, a new database
mysql will be initialized with the provided configuration variables. Furthermore, it will execute files with extensions
.sql that are found in
/docker-entrypoint-initdb.d. You can easily populate your mysql services by mounting a SQL dump into that directory and provide custom images with contributed data.
Where to Store Data
Important note: There are several ways to store data used by applications that run in Docker containers. We encourage users of the
mysql images to familiarize themselves with the options available, including:
- Let Docker manage the storage of your database data by writing the database files to disk on the host system using its own internal volume management. This is the default and is easy and fairly transparent to the user. The downside is that the files may be hard to locate for tools and applications that run directly on the host system, i.e. outside containers.
- Create a data directory on the host system (outside the container) and mount this to a directory visible from inside the container. This places the database files in a known location on the host system, and makes it easy for tools and applications on the host system to access the files. The downside is that the user needs to make sure that the directory exists, and that e.g. directory permissions and other security mechanisms on the host system are set up correctly.
The Docker documentation is a good starting point for understanding the different storage options and variations, and there are multiple blogs and forum postings that discuss and give advice in this area. We will simply show the basic procedure here for the latter option above:
- Create a data directory on a suitable volume on your host system, e.g.
mysqlcontainer like this:
$ docker run --name some-mysql -v /my/own/datadir:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d healthcareblocks/mysql:tag
-v /my/own/datadir:/var/lib/mysql part of the command mounts the
/my/own/datadir directory from the underlying host system as
/var/lib/mysql inside the container, where MySQL by default will write its data files.