314 lines
12 KiB
Markdown
314 lines
12 KiB
Markdown
---
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stage: Verify
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group: Pipeline Authoring
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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type: reference
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---
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# Multi-project pipelines **(FREE)**
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> [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/199224) to GitLab Free in 12.8.
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You can set up [GitLab CI/CD](../index.md) across multiple projects, so that a pipeline
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in one project can trigger a pipeline in another project. You can visualize the entire pipeline
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in one place, including all cross-project interdependencies.
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For example, you might deploy your web application from three different projects in GitLab.
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Each project has its own build, test, and deploy process. With multi-project pipelines you can
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visualize the entire pipeline, including all build and test stages for all three projects.
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<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
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For an overview, see the [Multi-project pipelines demo](https://www.youtube.com/watch?v=g_PIwBM1J84).
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Multi-project pipelines are also useful for larger products that require cross-project interdependencies, like those
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with a [microservices architecture](https://about.gitlab.com/blog/2016/08/16/trends-in-version-control-land-microservices/).
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Learn more in the [Cross-project Pipeline Triggering and Visualization demo](https://about.gitlab.com/learn/)
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at GitLab@learn, in the Continuous Integration section.
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If you trigger a pipeline in a downstream private project, on the upstream project's pipelines page,
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you can view:
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- The name of the project.
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- The status of the pipeline.
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If you have a public project that can trigger downstream pipelines in a private project,
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make sure there are no confidentiality problems.
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## Create multi-project pipelines
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To create multi-project pipelines, you can:
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- [Define them in your `.gitlab-ci.yml` file](#define-multi-project-pipelines-in-your-gitlab-ciyml-file).
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- [Use the API](#create-multi-project-pipelines-by-using-the-api).
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### Define multi-project pipelines in your `.gitlab-ci.yml` file
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> [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/199224) to GitLab Free in 12.8.
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When you create a multi-project pipeline in your `.gitlab-ci.yml` file,
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you create what is called a *trigger job*. For example:
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```yaml
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rspec:
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stage: test
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script: bundle exec rspec
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staging:
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variables:
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ENVIRONMENT: staging
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stage: deploy
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trigger: my/deployment
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```
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In this example, after the `rspec` job succeeds in the `test` stage,
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the `staging` trigger job starts. The initial status of this
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job is `pending`.
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GitLab then creates a downstream pipeline in the
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`my/deployment` project and, as soon as the pipeline is created, the
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`staging` job succeeds. The full path to the project is `my/deployment`.
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You can view the status for the pipeline, or you can display
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[the downstream pipeline's status instead](#mirror-status-of-a-triggered-pipeline-in-the-trigger-job).
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The user that creates the upstream pipeline must be able to create pipelines in the
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downstream project (`my/deployment`) too. If the downstream project is not found,
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or the user does not have [permission](../../user/permissions.md) to create a pipeline there,
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the `staging` job is marked as _failed_.
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#### Trigger job configuration keywords
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Trigger jobs can use only a limited set of the GitLab CI/CD [configuration keywords](../yaml/index.md).
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The keywords available for use in trigger jobs are:
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- [`trigger`](../yaml/index.md#trigger)
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- [`stage`](../yaml/index.md#stage)
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- [`allow_failure`](../yaml/index.md#allow_failure)
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- [`rules`](../yaml/index.md#rules)
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- [`only` and `except`](../yaml/index.md#only--except)
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- [`when`](../yaml/index.md#when) (only with a value of `on_success`, `on_failure`, or `always`)
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- [`extends`](../yaml/index.md#extends)
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- [`needs`](../yaml/index.md#needs), but not [`needs:project`](../yaml/index.md#needsproject)
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#### Specify a downstream pipeline branch
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You can specify a branch name for the downstream pipeline to use.
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GitLab uses the commit on the head of the branch to
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create the downstream pipeline.
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```yaml
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rspec:
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stage: test
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script: bundle exec rspec
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staging:
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stage: deploy
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trigger:
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project: my/deployment
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branch: stable-11-2
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```
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Use:
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- The `project` keyword to specify the full path to a downstream project.
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- The `branch` keyword to specify the name of a branch in the project specified by `project`.
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In [GitLab 12.4 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/10126), variable expansion is
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supported.
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Pipelines triggered on a protected branch in a downstream project use the [role](../../user/permissions.md)
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of the user that ran the trigger job in the upstream project. If the user does not
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have permission to run CI/CD pipelines against the protected branch, the pipeline fails. See
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[pipeline security for protected branches](index.md#pipeline-security-on-protected-branches).
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#### Pass CI/CD variables to a downstream pipeline by using the `variables` keyword
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Sometimes you might want to pass CI/CD variables to a downstream pipeline.
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You can do that by using the `variables` keyword, just like you would for any other job.
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```yaml
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rspec:
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stage: test
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script: bundle exec rspec
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staging:
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variables:
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ENVIRONMENT: staging
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stage: deploy
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trigger: my/deployment
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```
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The `ENVIRONMENT` variable is passed to every job defined in a downstream
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pipeline. It is available as a variable when GitLab Runner picks a job.
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In the following configuration, the `MY_VARIABLE` variable is passed to the downstream pipeline
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that is created when the `trigger-downstream` job is queued. This is because `trigger-downstream`
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job inherits variables declared in global variables blocks, and then we pass these variables to a downstream pipeline.
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```yaml
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variables:
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MY_VARIABLE: my-value
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trigger-downstream:
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variables:
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ENVIRONMENT: something
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trigger: my/project
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```
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You can stop global variables from reaching the downstream pipeline by using the [`inherit:variables` keyword](../yaml/index.md#inheritvariables).
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In this example, the `MY_GLOBAL_VAR` variable is not available in the triggered pipeline:
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```yaml
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variables:
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MY_GLOBAL_VAR: value
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trigger-downstream:
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inherit:
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variables: false
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variables:
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MY_LOCAL_VAR: value
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trigger: my/project
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```
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You might want to pass some information about the upstream pipeline using, for
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example, predefined variables. In order to do that, you can use interpolation
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to pass any variable. For example:
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```yaml
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downstream-job:
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variables:
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UPSTREAM_BRANCH: $CI_COMMIT_REF_NAME
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trigger: my/project
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```
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In this scenario, the `UPSTREAM_BRANCH` variable with a value related to the
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upstream pipeline is passed to the `downstream-job` job. It is available
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in the context of all downstream builds.
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Upstream pipelines take precedence over downstream ones. If there are two
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variables with the same name defined in both upstream and downstream projects,
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the ones defined in the upstream project take precedence.
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#### Pass CI/CD variables to a downstream pipeline by using variable inheritance
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You can pass variables to a downstream pipeline with [`dotenv` variable inheritance](../variables/index.md#pass-an-environment-variable-to-another-job) and [`needs:project`](../yaml/index.md#needsproject).
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In the upstream pipeline:
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1. Save the variables in a `.env` file.
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1. Save the `.env` file as a `dotenv` report.
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1. Trigger the downstream pipeline.
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```yaml
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build_vars:
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stage: build
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script:
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- echo "BUILD_VERSION=hello" >> build.env
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artifacts:
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reports:
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dotenv: build.env
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deploy:
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stage: deploy
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trigger: my/downstream_project
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```
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1. Set the `test` job in the downstream pipeline to inherit the variables from the `build_vars`
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job in the upstream project with `needs:`. The `test` job inherits the variables in the
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`dotenv` report and it can access `BUILD_VERSION` in the script:
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```yaml
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test:
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stage: test
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script:
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- echo $BUILD_VERSION
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needs:
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- project: my/upstream_project
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job: build_vars
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ref: master
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artifacts: true
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```
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#### Use `rules` or `only`/`except` with multi-project pipelines
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You can use CI/CD variables or the [`rules`](../yaml/index.md#rulesif) keyword to
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[control job behavior](../jobs/job_control.md) for multi-project pipelines. When a
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downstream pipeline is triggered with the [`trigger`](../yaml/index.md#trigger) keyword,
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the value of the [`$CI_PIPELINE_SOURCE` predefined variable](../variables/predefined_variables.md)
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is `pipeline` for all its jobs.
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If you use [`only/except`](../yaml/index.md#only--except) to control job behavior, use the
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[`pipelines`](../yaml/index.md#onlyrefs--exceptrefs) keyword.
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#### Mirror status of a triggered pipeline in the trigger job
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> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/11238) in GitLab Premium 12.3.
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> - [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/199224) to GitLab Free in 12.8.
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You can mirror the pipeline status from the triggered pipeline to the source
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trigger job by using `strategy: depend`. For example:
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```yaml
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trigger_job:
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trigger:
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project: my/project
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strategy: depend
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```
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### Create multi-project pipelines by using the API
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> [Moved](https://gitlab.com/gitlab-org/gitlab/-/issues/31573) to GitLab Free in 12.4.
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When you use the [`CI_JOB_TOKEN` to trigger pipelines](../jobs/ci_job_token.md),
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GitLab recognizes the source of the job token. The pipelines become related,
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so you can visualize their relationships on pipeline graphs.
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These relationships are displayed in the pipeline graph by showing inbound and
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outbound connections for upstream and downstream pipeline dependencies.
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When using:
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- CI/CD variables or [`rules`](../yaml/index.md#rulesif) to control job behavior, the value of
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the [`$CI_PIPELINE_SOURCE` predefined variable](../variables/predefined_variables.md) is
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`pipeline` for multi-project pipeline triggered through the API with `CI_JOB_TOKEN`.
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- [`only/except`](../yaml/index.md#only--except) to control job behavior, use the
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`pipelines` keyword.
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## Trigger a pipeline when an upstream project is rebuilt **(PREMIUM)**
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/9045) in GitLab 12.8.
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You can trigger a pipeline in your project whenever a pipeline finishes for a new
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tag in a different project.
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Prerequisites:
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- The upstream project must be [public](../../public_access/public_access.md).
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- The user must have the [Developer role](../../user/permissions.md#project-members-permissions)
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in the upstream project.
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To trigger the pipeline when the upstream project is rebuilt:
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1. On the top bar, select **Menu > Projects** and find your project.
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1. On the left sidebar, select **Settings > CI/CD**.
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1. Expand **Pipeline subscriptions**.
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1. Enter the project you want to subscribe to, in the format `<namespace>/<project>`.
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For example, if the project is `https://gitlab.com/gitlab-org/gitlab`, use `gitlab-org/gitlab`.
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1. Select **Subscribe**.
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Any pipelines that complete successfully for new tags in the subscribed project
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now trigger a pipeline on the current project's default branch. The maximum
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number of upstream pipeline subscriptions is 2 by default, for both the upstream and
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downstream projects. On self-managed instances, an administrator can change this
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[limit](../../administration/instance_limits.md#number-of-cicd-subscriptions-to-a-project).
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## Multi-project pipeline visualization **(PREMIUM)**
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When you configure GitLab CI/CD for your project, you can visualize the stages of your
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[jobs](index.md#configure-a-pipeline) on a [pipeline graph](index.md#visualize-pipelines).
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In the merge request, on the **Pipelines** tab, multi-project pipeline mini-graphs are displayed.
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They expand and are shown adjacent to each other when hovering (or tapping on touchscreen devices).
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