645 lines
23 KiB
Markdown
645 lines
23 KiB
Markdown
# Using Docker images
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GitLab CI in conjunction with [GitLab Runner](../runners/README.md) can use
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[Docker Engine](https://www.docker.com/) to test and build any application.
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Docker is an open-source project that allows you to use predefined images to
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run applications in independent "containers" that are run within a single Linux
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instance. [Docker Hub][hub] has a rich database of pre-built images that can be
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used to test and build your applications.
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Docker, when used with GitLab CI, runs each job in a separate and isolated
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container using the predefined image that is set up in
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[`.gitlab-ci.yml`](../yaml/README.md).
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This makes it easier to have a simple and reproducible build environment that
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can also run on your workstation. The added benefit is that you can test all
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the commands that we will explore later from your shell, rather than having to
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test them on a dedicated CI server.
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## Register Docker Runner
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To use GitLab Runner with Docker you need to [register a new Runner][register]
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to use the `docker` executor.
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A one-line example can be seen below:
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```bash
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sudo gitlab-runner register \
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--url "https://gitlab.example.com/" \
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--registration-token "PROJECT_REGISTRATION_TOKEN" \
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--description "docker-ruby-2.1" \
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--executor "docker" \
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--docker-image ruby:2.1 \
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--docker-postgres latest \
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--docker-mysql latest
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```
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The registered runner will use the `ruby:2.1` Docker image and will run two
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services, `postgres:latest` and `mysql:latest`, both of which will be
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accessible during the build process.
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## What is an image
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The `image` keyword is the name of the Docker image the Docker executor
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will run to perform the CI tasks.
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By default, the executor will only pull images from [Docker Hub][hub],
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but this can be configured in the `gitlab-runner/config.toml` by setting
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the [Docker pull policy][] to allow using local images.
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For more information about images and Docker Hub please read
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the [Docker Fundamentals][] documentation.
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## What is a service
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The `services` keyword defines just another Docker image that is run during
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your job and is linked to the Docker image that the `image` keyword defines.
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This allows you to access the service image during build time.
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The service image can run any application, but the most common use case is to
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run a database container, e.g., `mysql`. It's easier and faster to use an
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existing image and run it as an additional container than install `mysql` every
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time the project is built.
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You are not limited to have only database services. You can add as many
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services you need to `.gitlab-ci.yml` or manually modify `config.toml`.
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Any image found at [Docker Hub][hub] or your private Container Registry can be
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used as a service.
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You can see some widely used services examples in the relevant documentation of
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[CI services examples](../services/README.md).
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### How services are linked to the job
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To better understand how the container linking works, read
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[Linking containers together][linking-containers].
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To summarize, if you add `mysql` as service to your application, the image will
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then be used to create a container that is linked to the job container.
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The service container for MySQL will be accessible under the hostname `mysql`.
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So, in order to access your database service you have to connect to the host
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named `mysql` instead of a socket or `localhost`. Read more in [accessing the
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services](#accessing-the-services).
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### How the health check of services works
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Services are designed to provide additional functionality which is **network accessible**.
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It may be a database like MySQL, or Redis, and even `docker:stable-dind` which
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allows you to use Docker in Docker. It can be practically anything that is
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required for the CI/CD job to proceed and is accessed by network.
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To make sure this works, the Runner:
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1. checks which ports are exposed from the container by default
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1. starts a special container that waits for these ports to be accessible
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When the second stage of the check fails, either because there is no opened port in the
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service, or the service was not started properly before the timeout and the port is not
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responding, it prints the warning: `*** WARNING: Service XYZ probably didn't start properly`.
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In most cases it will affect the job, but there may be situations when the job
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will still succeed even if that warning was printed. For example:
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- The service was started a little after the warning was raised, and the job is
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not using the linked service from the very beginning. In that case, when the
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job needed to access the service, it may have been already there waiting for
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connections.
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- The service container is not providing any networking service, but it's doing
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something with the job's directory (all services have the job directory mounted
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as a volume under `/builds`). In that case, the service will do its job, and
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since the job is not trying to connect to it, it won't fail.
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### What services are not for
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As it was mentioned before, this feature is designed to provide **network accessible**
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services. A database is the simplest example of such a service.
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NOTE: **Note:**
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The services feature is not designed to, and will not add any software from the
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defined `services` image(s) to the job's container.
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For example, if you have the following `services` defined in your job, the `php`,
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`node` or `go` commands will **not** be available for your script, and thus
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the job will fail:
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```yaml
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job:
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services:
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- php:7
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- node:latest
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- golang:1.10
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image: alpine:3.7
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script:
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- php -v
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- node -v
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- go version
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```
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If you need to have `php`, `node` and `go` available for your script, you should
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either:
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- choose an existing Docker image that contains all required tools, or
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- create your own Docker image, which will have all the required tools included
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and use that in your job
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### Accessing the services
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Let's say that you need a Wordpress instance to test some API integration with
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your application.
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You can then use for example the [tutum/wordpress][] image in your
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`.gitlab-ci.yml`:
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```yaml
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services:
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- tutum/wordpress:latest
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```
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If you don't [specify a service alias](#available-settings-for-services),
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when the job is run, `tutum/wordpress` will be started and you will have
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access to it from your build container under two hostnames to choose from:
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- `tutum-wordpress`
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- `tutum__wordpress`
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>**Note:**
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Hostnames with underscores are not RFC valid and may cause problems in 3rd party
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applications.
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The default aliases for the service's hostname are created from its image name
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following these rules:
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- Everything after the colon (`:`) is stripped
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- Slash (`/`) is replaced with double underscores (`__`) and the primary alias
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is created
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- Slash (`/`) is replaced with a single dash (`-`) and the secondary alias is
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created (requires GitLab Runner v1.1.0 or higher)
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To override the default behavior, you can
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[specify a service alias](#available-settings-for-services).
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## Define `image` and `services` from `.gitlab-ci.yml`
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You can simply define an image that will be used for all jobs and a list of
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services that you want to use during build time:
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```yaml
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image: ruby:2.2
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services:
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- postgres:9.3
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before_script:
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- bundle install
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test:
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script:
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- bundle exec rake spec
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```
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It is also possible to define different images and services per job:
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```yaml
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before_script:
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- bundle install
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test:2.1:
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image: ruby:2.1
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services:
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- postgres:9.3
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script:
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- bundle exec rake spec
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test:2.2:
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image: ruby:2.2
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services:
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- postgres:9.4
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script:
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- bundle exec rake spec
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```
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Or you can pass some [extended configuration options](#extended-docker-configuration-options)
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for `image` and `services`:
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```yaml
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image:
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name: ruby:2.2
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entrypoint: ["/bin/bash"]
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services:
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- name: my-postgres:9.4
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alias: db-postgres
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entrypoint: ["/usr/local/bin/db-postgres"]
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command: ["start"]
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before_script:
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- bundle install
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test:
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script:
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- bundle exec rake spec
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```
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## Extended Docker configuration options
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> Introduced in GitLab and GitLab Runner 9.4.
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When configuring the `image` or `services` entries, you can use a string or a map as
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options:
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- when using a string as an option, it must be the full name of the image to use
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(including the Registry part if you want to download the image from a Registry
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other than Docker Hub)
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- when using a map as an option, then it must contain at least the `name`
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option, which is the same name of the image as used for the string setting
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For example, the following two definitions are equal:
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1. Using a string as an option to `image` and `services`:
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```yaml
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image: "registry.example.com/my/image:latest"
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services:
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- postgresql:9.4
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- redis:latest
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```
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1. Using a map as an option to `image` and `services`. The use of `image:name` is
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required:
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```yaml
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image:
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name: "registry.example.com/my/image:latest"
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services:
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- name: postgresql:9.4
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- name: redis:latest
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```
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### Available settings for `image`
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> Introduced in GitLab and GitLab Runner 9.4.
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| Setting | Required | GitLab version | Description |
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|------------|----------|----------------| ----------- |
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| `name` | yes, when used with any other option | 9.4 |Full name of the image that should be used. It should contain the Registry part if needed. |
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| `entrypoint` | no | 9.4 |Command or script that should be executed as the container's entrypoint. It will be translated to Docker's `--entrypoint` option while creating the container. The syntax is similar to [`Dockerfile`'s `ENTRYPOINT`][entrypoint] directive, where each shell token is a separate string in the array. |
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### Available settings for `services`
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> Introduced in GitLab and GitLab Runner 9.4.
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| Setting | Required | GitLab version | Description |
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|------------|----------|----------------| ----------- |
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| `name` | yes, when used with any other option | 9.4 | Full name of the image that should be used. It should contain the Registry part if needed. |
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| `entrypoint` | no | 9.4 |Command or script that should be executed as the container's entrypoint. It will be translated to Docker's `--entrypoint` option while creating the container. The syntax is similar to [`Dockerfile`'s `ENTRYPOINT`][entrypoint] directive, where each shell token is a separate string in the array. |
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| `command` | no | 9.4 |Command or script that should be used as the container's command. It will be translated to arguments passed to Docker after the image's name. The syntax is similar to [`Dockerfile`'s `CMD`][cmd] directive, where each shell token is a separate string in the array. |
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| `alias` | no | 9.4 |Additional alias that can be used to access the service from the job's container. Read [Accessing the services](#accessing-the-services) for more information. |
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### Starting multiple services from the same image
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> Introduced in GitLab and GitLab Runner 9.4. Read more about the [extended
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configuration options](#extended-docker-configuration-options).
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Before the new extended Docker configuration options, the following configuration
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would not work properly:
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```yaml
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services:
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- mysql:latest
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- mysql:latest
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```
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The Runner would start two containers using the `mysql:latest` image, but both
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of them would be added to the job's container with the `mysql` alias based on
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the [default hostname naming](#accessing-the-services). This would end with one
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of the services not being accessible.
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After the new extended Docker configuration options, the above example would
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look like:
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```yaml
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services:
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- name: mysql:latest
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alias: mysql-1
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- name: mysql:latest
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alias: mysql-2
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```
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The Runner will still start two containers using the `mysql:latest` image,
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but now each of them will also be accessible with the alias configured
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in `.gitlab-ci.yml` file.
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### Setting a command for the service
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> Introduced in GitLab and GitLab Runner 9.4. Read more about the [extended
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configuration options](#extended-docker-configuration-options).
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Let's assume you have a `super/sql:latest` image with some SQL database
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inside it and you would like to use it as a service for your job. Let's also
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assume that this image doesn't start the database process while starting
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the container and the user needs to manually use `/usr/bin/super-sql run` as
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a command to start the database.
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Before the new extended Docker configuration options, you would need to create
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your own image based on the `super/sql:latest` image, add the default command,
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and then use it in job's configuration, like:
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```Dockerfile
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# my-super-sql:latest image's Dockerfile
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FROM super/sql:latest
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CMD ["/usr/bin/super-sql", "run"]
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```
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```yaml
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# .gitlab-ci.yml
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services:
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- my-super-sql:latest
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```
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After the new extended Docker configuration options, you can now simply
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set a `command` in `.gitlab-ci.yml`, like:
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```yaml
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# .gitlab-ci.yml
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services:
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- name: super/sql:latest
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command: ["/usr/bin/super-sql", "run"]
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```
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As you can see, the syntax of `command` is similar to [Dockerfile's `CMD`][cmd].
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### Overriding the entrypoint of an image
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> Introduced in GitLab and GitLab Runner 9.4. Read more about the [extended
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configuration options](#extended-docker-configuration-options).
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Before showing the available entrypoint override methods, let's describe shortly
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how the Runner starts and uses a Docker image for the containers used in the
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CI jobs:
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1. The Runner starts a Docker container using the defined entrypoint (default
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from `Dockerfile` that may be overridden in `.gitlab-ci.yml`)
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1. The Runner attaches itself to a running container.
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1. The Runner prepares a script (the combination of
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[`before_script`](../yaml/README.md#before_script),
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[`script`](../yaml/README.md#script),
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and [`after_script`](../yaml/README.md#after_script)).
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1. The Runner sends the script to the container's shell STDIN and receives the
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output.
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To override the entrypoint of a Docker image, the recommended solution is to
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define an empty `entrypoint` in `.gitlab-ci.yml`, so the Runner doesn't start
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a useless shell layer. However, that will not work for all Docker versions, and
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you should check which one your Runner is using. Specifically:
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- If Docker 17.06 or later is used, the `entrypoint` can be set to an empty value.
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- If Docker 17.03 or previous versions are used, the `entrypoint` can be set to
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`/bin/sh -c`, `/bin/bash -c` or an equivalent shell available in the image.
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The syntax of `image:entrypoint` is similar to [Dockerfile's `ENTRYPOINT`][entrypoint].
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----
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Let's assume you have a `super/sql:experimental` image with some SQL database
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inside it and you would like to use it as a base image for your job because you
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want to execute some tests with this database binary. Let's also assume that
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this image is configured with `/usr/bin/super-sql run` as an entrypoint. That
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means that when starting the container without additional options, it will run
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the database's process, while Runner expects that the image will have no
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entrypoint or that the entrypoint is prepared to start a shell command.
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With the extended Docker configuration options, instead of creating your
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own image based on `super/sql:experimental`, setting the `ENTRYPOINT`
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to a shell, and then using the new image in your CI job, you can now simply
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define an `entrypoint` in `.gitlab-ci.yml`.
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**For Docker 17.06+:**
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```yaml
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image:
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name: super/sql:experimental
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entrypoint: [""]
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```
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**For Docker =< 17.03:**
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```yaml
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image:
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name: super/sql:experimental
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entrypoint: ["/bin/sh", "-c"]
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```
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## Define image and services in `config.toml`
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Look for the `[runners.docker]` section:
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```
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[runners.docker]
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image = "ruby:2.1"
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services = ["mysql:latest", "postgres:latest"]
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```
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The image and services defined this way will be added to all job run by
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that runner.
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## Define an image from a private Container Registry
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> **Notes:**
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>
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> - This feature requires GitLab Runner **1.8** or higher
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> - For GitLab Runner versions **>= 0.6, <1.8** there was a partial
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> support for using private registries, which required manual configuration
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> of credentials on runner's host. We recommend to upgrade your Runner to
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> at least version **1.8** if you want to use private registries.
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> - If the repository is private you need to authenticate your GitLab Runner in the
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> registry. Learn more about how [GitLab Runner works in this case][runner-priv-reg].
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As an example, let's assume that you want to use the `registry.example.com:5000/private/image:latest`
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image which is private and requires you to login into a private container registry.
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Let's also assume that these are the login credentials:
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| Key | Value |
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|----------|---------------------------|
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| registry | registry.example.com:5000 |
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| username | my_username |
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| password | my_password |
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To configure access for `registry.example.com:5000`, follow these steps:
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1. Find what the value of `DOCKER_AUTH_CONFIG` should be. There are two ways to
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accomplish this:
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- **First way -** Do a `docker login` on your local machine:
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```bash
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docker login registry.example.com:5000 --username my_username --password my_password
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```
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Then copy the content of `~/.docker/config.json`.
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- **Second way -** In some setups, it's possible that Docker client will use
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the available system keystore to store the result of `docker login`. In
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that case, it's impossible to read `~/.docker/config.json`, so you will
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need to prepare the required base64-encoded version of
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`${username}:${password}` manually. Open a terminal and execute the
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following command:
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```bash
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echo -n "my_username:my_password" | base64
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# Example output to copy
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bXlfdXNlcm5hbWU6bXlfcGFzc3dvcmQ=
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```
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1. Create a [variable] `DOCKER_AUTH_CONFIG` with the content of the
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Docker configuration file as the value:
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```json
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{
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"auths": {
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"registry.example.com:5000": {
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"auth": "bXlfdXNlcm5hbWU6bXlfcGFzc3dvcmQ="
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}
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}
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}
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```
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1. Optionally,if you followed the first way of finding the `DOCKER_AUTH_CONFIG`
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value, do a `docker logout` on your computer if you don't need access to the
|
|
registry from it:
|
|
|
|
```bash
|
|
docker logout registry.example.com:5000
|
|
```
|
|
|
|
1. You can now use any private image from `registry.example.com:5000` defined in
|
|
`image` and/or `services` in your `.gitlab-ci.yml` file:
|
|
|
|
```yaml
|
|
image: registry.example.com:5000/namespace/image:tag
|
|
```
|
|
|
|
In the example above, GitLab Runner will look at `registry.example.com:5000` for the
|
|
image `namespace/image:tag`.
|
|
|
|
You can add configuration for as many registries as you want, adding more
|
|
registries to the `"auths"` hash as described above.
|
|
|
|
NOTE: **Note:** The full `hostname:port` combination is required everywhere
|
|
for the Runner to match the `DOCKER_AUTH_CONFIG`. For example, if
|
|
`registry.example.com:5000/namespace/image:tag` is specified in `.gitlab-ci.yml`,
|
|
then the `DOCKER_AUTH_CONFIG` must also specify `registry.example.com:5000`.
|
|
Specifying only `registry.example.com` will not work.
|
|
|
|
## Configuring services
|
|
|
|
Many services accept environment variables which allow you to easily change
|
|
database names or set account names depending on the environment.
|
|
|
|
GitLab Runner 0.5.0 and up passes all YAML-defined variables to the created
|
|
service containers.
|
|
|
|
For all possible configuration variables check the documentation of each image
|
|
provided in their corresponding Docker hub page.
|
|
|
|
*Note: All variables will be passed to all services containers. It's not
|
|
designed to distinguish which variable should go where.*
|
|
|
|
### PostgreSQL service example
|
|
|
|
See the specific documentation for
|
|
[using PostgreSQL as a service](../services/postgres.md).
|
|
|
|
### MySQL service example
|
|
|
|
See the specific documentation for
|
|
[using MySQL as a service](../services/mysql.md).
|
|
|
|
## How Docker integration works
|
|
|
|
Below is a high level overview of the steps performed by Docker during job
|
|
time.
|
|
|
|
1. Create any service container: `mysql`, `postgresql`, `mongodb`, `redis`.
|
|
1. Create cache container to store all volumes as defined in `config.toml` and
|
|
`Dockerfile` of build image (`ruby:2.1` as in above example).
|
|
1. Create build container and link any service container to build container.
|
|
1. Start build container and send job script to the container.
|
|
1. Run job script.
|
|
1. Checkout code in: `/builds/group-name/project-name/`.
|
|
1. Run any step defined in `.gitlab-ci.yml`.
|
|
1. Check exit status of build script.
|
|
1. Remove build container and all created service containers.
|
|
|
|
## How to debug a job locally
|
|
|
|
*Note: The following commands are run without root privileges. You should be
|
|
able to run Docker with your regular user account.*
|
|
|
|
First start with creating a file named `build_script`:
|
|
|
|
```bash
|
|
cat <<EOF > build_script
|
|
git clone https://gitlab.com/gitlab-org/gitlab-runner.git /builds/gitlab-org/gitlab-runner
|
|
cd /builds/gitlab-org/gitlab-runner
|
|
make
|
|
EOF
|
|
```
|
|
|
|
Here we use as an example the GitLab Runner repository which contains a
|
|
Makefile, so running `make` will execute the commands defined in the Makefile.
|
|
Your mileage may vary, so instead of `make` you could run the command which
|
|
is specific to your project.
|
|
|
|
Then create some service containers:
|
|
|
|
```
|
|
docker run -d --name service-mysql mysql:latest
|
|
docker run -d --name service-postgres postgres:latest
|
|
```
|
|
|
|
This will create two service containers, named `service-mysql` and
|
|
`service-postgres` which use the latest MySQL and PostgreSQL images
|
|
respectively. They will both run in the background (`-d`).
|
|
|
|
Finally, create a build container by executing the `build_script` file we
|
|
created earlier:
|
|
|
|
```
|
|
docker run --name build -i --link=service-mysql:mysql --link=service-postgres:postgres ruby:2.1 /bin/bash < build_script
|
|
```
|
|
|
|
The above command will create a container named `build` that is spawned from
|
|
the `ruby:2.1` image and has two services linked to it. The `build_script` is
|
|
piped using STDIN to the bash interpreter which in turn executes the
|
|
`build_script` in the `build` container.
|
|
|
|
When you finish testing and no longer need the containers, you can remove them
|
|
with:
|
|
|
|
```
|
|
docker rm -f -v build service-mysql service-postgres
|
|
```
|
|
|
|
This will forcefully (`-f`) remove the `build` container, the two service
|
|
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/
|
|
[postgres-hub]: https://hub.docker.com/r/_/postgres/
|
|
[mysql-hub]: https://hub.docker.com/r/_/mysql/
|
|
[runner-priv-reg]: http://docs.gitlab.com/runner/configuration/advanced-configuration.html#using-a-private-container-registry
|
|
[variable]: ../variables/README.md#variables
|
|
[entrypoint]: https://docs.docker.com/engine/reference/builder/#entrypoint
|
|
[cmd]: https://docs.docker.com/engine/reference/builder/#cmd
|
|
[register]: https://docs.gitlab.com/runner/register/
|