Update using_docker_images.md

Signed-off-by: Rémy Coutable <remy@rymai.me>
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Adam Boseley 2017-01-02 03:11:03 +00:00 committed by Rémy Coutable
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@ -39,13 +39,15 @@ accessible during the build process.
## What is an image
The `image` keyword is the name of the docker image that is present in the
local Docker Engine (list all images with `docker images`) or any image that
can be found at [Docker Hub][hub]. For more information about images and Docker
Hub please read the [Docker Fundamentals][] documentation.
The `image` keyword is the name of the docker image the docker executor
will run to perform the CI tasks.
In short, with `image` we refer to the docker image, which will be used to
create a container on which your job will run.
By default the executor will only pull images from [Docker Hub][hub],
but this can be configured in the `gitlab-runner/config.toml` by setting
the [docker pull policy][] to allow using local images.
For more information about images and Docker Hub please read
the [Docker Fundamentals][] documentation.
## What is a service
@ -271,6 +273,7 @@ containers as well as all volumes (`-v`) that were created with the container
creation.
[Docker Fundamentals]: https://docs.docker.com/engine/understanding-docker/
[docker pull policy]: https://docs.gitlab.com/runner/executors/docker.html#how-pull-policies-work
[hub]: https://hub.docker.com/
[linking-containers]: https://docs.docker.com/engine/userguide/networking/default_network/dockerlinks/
[tutum/wordpress]: https://hub.docker.com/r/tutum/wordpress/