Configuration of your builds with .gitlab-ci.yml
From version 7.12, GitLab CI uses a YAML file (.gitlab-ci.yml) for the project configuration. It is placed in the root of your repository and contains definitions of how your project should be built.
The YAML file defines a set of jobs with constraints stating when they should be run.
The jobs are defined as top-level elements with a name and always have to contain the
job1: script: "execute-script-for-job1" job2: script: "execute-script-for-job2"
The above example is the simplest possible CI configuration with two separate jobs,
where each of the jobs executes a different command.
Of course a command can execute code directly (
./configure;make;make install) or run a script (
test.sh) in the repository.
Jobs are used to create builds, which are then picked up by runners and executed within the environment of the runner. What is important, is that each job is run independently from each other.
The YAML syntax allows for using more complex job specifications than in the above example:
image: ruby:2.1 services: - postgres before_script: - bundle_install stages: - build - test - deploy job1: stage: build script: - execute-script-for-job1 only: - master tags: - docker
There are a few
keywords that can't be used as job names:
|image||optional||Use docker image, covered in Use Docker|
|services||optional||Use docker services, covered in Use Docker|
|stages||optional||Define build stages|
|before_script||optional||Define commands prepended for each job's script|
|variables||optional||Define build variables|
image and services
This allows to specify a custom Docker image and a list of services that can be used for time of the build. The configuration of this feature is covered in separate document: Use Docker.
before_script is used to define the command that should be run before all builds, including deploy builds. This can be an array or a multiline string.
stages is used to define build stages that can be used by jobs.
The specification of
stages allows for having flexible multi stage pipelines.
The ordering of elements in
stages defines the ordering of builds' execution:
- Builds of the same stage are run in parallel.
- Builds of next stage are run after success.
Let's consider the following example, which defines 3 stages:
stages: - build - test - deploy
- First all jobs of
buildare executed in parallel.
- If all jobs of
testjobs are executed in parallel.
- If all jobs of
deployjobs are executed in parallel.
- If all jobs of
deploysucceeds, the commit is marked as
- If any of the previous jobs fails, the commit is marked as
failedand no jobs of further stage are executed.
There are also two edge cases worth mentioning:
- If no
stagesis defined in
.gitlab-ci.yml, then by default the
deployare allowed to be used as job's stage by default.
- If a job doesn't specify
stage, the job is assigned the
Alias for stages.
This feature requires
gitlab-runner with version equal or greater than 0.5.0.
GitLab CI allows you to add to
.gitlab-ci.yml variables that are set in build environment.
The variables are stored in repository and are meant to store non-sensitive project configuration, ie. RAILS_ENV or DATABASE_URL.
variables: DATABASE_URL: "postgres://postgres@postgres/my_database"
These variables can be later used in all executed commands and scripts.
The YAML-defined variables are also set to all created service containers, thus allowing to fine tune them.
.gitlab-ci.yml allows you to specify an unlimited number of jobs.
Each job has to have a unique
job_name, which is not one of the keywords mentioned above.
A job is defined by a list of parameters that define the build behaviour.
job_name: script: - rake spec - coverage stage: test only: - master except: - develop tags: - ruby - postgres allow_failure: true
|script||required||Defines a shell script which is executed by runner|
|stage||optional (default: test)||Defines a build stage|
|only||optional||Defines a list of git refs for which build is created|
|except||optional||Defines a list of git refs for which build is not created|
|tags||optional||Defines a list of tags which are used to select runner|
|allow_failure||optional||Allow build to fail. Failed build doesn't contribute to commit status|
script is a shell script which is executed by runner. The shell script is prepended with
job: script: "bundle exec rspec"
This parameter can also contain several commands using an array:
job: script: - uname -a - bundle exec rspec
stage allows to group build into different stages. Builds of the same
stage are executed in
For more info about the use of
stage please check the stages.
only and except
This are two parameters that allow for setting a refs policy to limit when jobs are built:
onlydefines the names of branches and tags for which job will be built.
exceptdefines the names of branches and tags for which the job wil not be built.
There are a few rules that apply to usage of refs policy:
exceptare exclusive. If both
exceptare defined in job specification only
onlyis taken into account.
exceptallow for using the regexp expressions.
exceptallow for using special keywords:
tags. These names can be used for example to exclude all tags and all branches.
job: only: - /^issue-.*$/ # use regexp except: - branches # use special keyword
tags is used to select specific runners from the list of all runners that are allowed to run this project.
During registration of a runner, you can specify the runner's tags, ie.:
tags allow you to run builds with runners that have the specified tags assigned:
job: tags: - ruby - postgres
The above specification will make sure that
job is built by a runner that have
postgres tags defined.
Validate the .gitlab-ci.yml
Each instance of GitLab CI has an embedded debug tool called Lint.
You can find the link to the Lint in the project's settings page or use short url
There is one more way to skip all builds, if your commit message contains tag [ci skip]. In this case, commit will be created but builds will be skipped