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# GitLab CI Services

GitLab CI uses the `services` keyword to define what docker containers should
be linked with your base image. Below is a list of examples you may use.

- [Using MySQL](mysql.md)
- [Using PostgreSQL](postgres.md)
- [Using Redis](redis.md)
- [Using Other Services](../docker/using_docker_images.md#how-to-use-other-images-as-services)