MySQL Fixtures Base Image

This is a MySQL Database image tuned for fast start up times, designed to be extended for purposes of providing fixtures.

The Official MySQL Image, while Ok to use as a normal database, does too many things on startup. Instead we install the database directory and preload the schema during build. This allows us to use Docker's copy-on-write filesystem to efficiently discard any data written after container start.

The result is an image that, once built, can be stopped and started in a fraction of a second, making it suitable to use as part of your integration test suite.

How to use this image

Extend this image within your Dockerfile using the FROM directive. Do all the fixture seed during the build. You can use any tools you want as long as you wrap the commands with start-mysql and stop-mysql. The changes to the database directory will then be commited as a file system layer by docker.

Example Dockerfile:

FROM zanox/mysql

COPY schema.sql /
RUN start-mysql && \
    mysql < /schema.sql && \
    stop-mysql

The reasoning behind using the start and stop commands is that it allows you to split up your setup procedure and leverage docker's caching mechanism with fixtures that are large and edited less often placed higher up.

The disadvantage is of course COW duplication of any touched tables for each RUN directive.

MySQL Daemon itself is started by S6. You can add in more services to start in together with MySQL by adding the service definitions to run files: services.d/<service_name>/run. Test that your services work by running make run followed by manually invoking S6: /init

Notes on the Makefile

You can try this project out by running make build start and connecting to default mysql port on your dockerhost. The Makefile makes trying the project out consistent and simple. I would encourage you to use it as a template for your own project.

License

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