debian-mirror-gitlab/doc/ci/pipelines/index.md

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---
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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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disqus_identifier: 'https://docs.gitlab.com/ee/ci/pipelines.html'
type: reference
---
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# CI/CD pipelines **(FREE)**
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NOTE:
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Watch the
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["Mastering continuous software development"](https://about.gitlab.com/webcast/mastering-ci-cd/)
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webcast to see a comprehensive demo of a GitLab CI/CD pipeline.
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Pipelines are the top-level component of continuous integration, delivery, and deployment.
Pipelines comprise:
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- Jobs, which define *what* to do. For example, jobs that compile or test code.
- Stages, which define *when* to run the jobs. For example, stages that run tests after stages that compile the code.
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Jobs are executed by [runners](../runners/index.md). Multiple jobs in the same stage are executed in parallel,
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if there are enough concurrent runners.
If *all* jobs in a stage succeed, the pipeline moves on to the next stage.
If *any* job in a stage fails, the next stage is not (usually) executed and the pipeline ends early.
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In general, pipelines are executed automatically and require no intervention once created. However, there are
also times when you can manually interact with a pipeline.
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A typical pipeline might consist of four stages, executed in the following order:
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- A `build` stage, with a job called `compile`.
- A `test` stage, with two jobs called `test1` and `test2`.
- A `staging` stage, with a job called `deploy-to-stage`.
- A `production` stage, with a job called `deploy-to-prod`.
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NOTE:
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If you have a [mirrored repository that GitLab pulls from](../../user/project/repository/mirror/pull.md),
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you may need to enable pipeline triggering in your project's
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**Settings > Repository > Mirroring repositories > Trigger pipelines for mirror updates**.
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## Types of pipelines
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Pipelines can be configured in many different ways:
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- [Basic pipelines](pipeline_architectures.md#basic-pipelines) run everything in each stage concurrently,
followed by the next stage.
- [Directed Acyclic Graph Pipeline (DAG) pipelines](../directed_acyclic_graph/index.md) are based on relationships
between jobs and can run more quickly than basic pipelines.
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- [Merge request pipelines](../pipelines/merge_request_pipelines.md) run for merge
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requests only (rather than for every commit).
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- [Merged results pipelines](../pipelines/merged_results_pipelines.md)
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are merge request pipelines that act as though the changes from the source branch have
already been merged into the target branch.
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- [Merge trains](../pipelines/merge_trains.md)
use merged results pipelines to queue merges one after the other.
- [Parent-child pipelines](parent_child_pipelines.md) break down complex pipelines
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into one parent pipeline that can trigger multiple child sub-pipelines, which all
run in the same project and with the same SHA. This pipeline architecture is commonly used for mono-repos.
- [Multi-project pipelines](multi_project_pipelines.md) combine pipelines for different projects together.
### How parent-child pipelines compare to multi-project pipelines
Parent-child pipelines and multi-project pipelines can sometimes be used for similar
purposes, but there are some key differences:
Parent-child pipelines:
- Run under the same project, ref, and commit SHA as the parent pipeline.
- Affect the overall status of the ref the pipeline runs against. For example,
if a pipeline fails for the main branch, it's common to say that "main is broken".
The status of child pipelines don't directly affect the status of the ref, unless the child
pipeline is triggered with [`strategy:depend`](../yaml/index.md#triggerstrategy).
- Are automatically canceled if the pipeline is configured with [`interruptible`](../yaml/index.md#interruptible)
when a new pipeline is created for the same ref.
- Display only the parent pipelines in the pipeline index page. Child pipelines are
visible when visiting their parent pipeline's page.
- Are limited to 2 levels of nesting. A parent pipeline can trigger multiple child pipelines,
and those child pipeline can trigger multiple child pipelines (`A -> B -> C`).
Multi-project pipelines:
- Are triggered from another pipeline, but the upstream (triggering) pipeline does
not have much control over the downstream (triggered) pipeline. However, it can
choose the ref of the downstream pipeline, and pass CI/CD variables to it.
- Affect the overall status of the ref of the project it runs in, but does not
affect the status of the triggering pipeline's ref, unless it was triggered with
[`strategy:depend`](../yaml/index.md#triggerstrategy).
- Are not automatically canceled in the downstream project when using [`interruptible`](../yaml/index.md#interruptible)
if a new pipeline runs for the same ref in the upstream pipeline. They can be
automatically canceled if a new pipeline is triggered for the same ref on the downstream project.
- Multi-project pipelines are standalone pipelines because they are normal pipelines
that happened to be triggered by an external project. They are all visible on the pipeline index page.
- Are independent, so there are no nesting limits.
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## Configure a pipeline
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Pipelines and their component jobs and stages are defined in the CI/CD pipeline configuration file for each project.
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- [Jobs](../jobs/index.md) are the basic configuration component.
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- Stages are defined by using the [`stages`](../yaml/index.md#stages) keyword.
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For a list of configuration options in the CI pipeline file, see the [GitLab CI/CD Pipeline Configuration Reference](../yaml/index.md).
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You can also configure specific aspects of your pipelines through the GitLab UI. For example:
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- [Pipeline settings](settings.md) for each project.
- [Pipeline schedules](schedules.md).
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- [Custom CI/CD variables](../variables/index.md#custom-cicd-variables).
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### Ref specs for runners
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When a runner picks a pipeline job, GitLab provides that job's metadata. This includes the [Git refspecs](https://git-scm.com/book/en/v2/Git-Internals-The-Refspec),
which indicate which ref (branch, tag, and so on) and commit (SHA1) are checked out from your
project repository.
This table lists the refspecs injected for each pipeline type:
| Pipeline type | Refspecs |
|--------------- |---------------------------------------- |
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| pipeline for branches | `+<sha>:refs/pipelines/<id>` and `+refs/heads/<name>:refs/remotes/origin/<name>` |
| pipeline for tags | `+<sha>:refs/pipelines/<id>` and `+refs/tags/<name>:refs/tags/<name>` |
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| [merge request pipeline](../pipelines/merge_request_pipelines.md) | `+<sha>:refs/pipelines/<id>` |
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The refs `refs/heads/<name>` and `refs/tags/<name>` exist in your
project repository. GitLab generates the special ref `refs/pipelines/<id>` during a
running pipeline job. This ref can be created even after the associated branch or tag has been
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deleted. It's therefore useful in some features such as [automatically stopping an environment](../environments/index.md#stop-an-environment),
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and [merge trains](../pipelines/merge_trains.md)
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that might run pipelines after branch deletion.
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### View pipelines
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You can find the current and historical pipeline runs under your project's
**CI/CD > Pipelines** page. You can also access pipelines for a merge request by navigating
to its **Pipelines** tab.
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![Pipelines index page](img/pipelines_index_v13_0.png)
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Select a pipeline to open the **Pipeline Details** page and show
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the jobs that were run for that pipeline. From here you can cancel a running pipeline,
retry jobs on a failed pipeline, or [delete a pipeline](#delete-a-pipeline).
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[Starting in GitLab 12.3](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/50499), a link to the
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latest pipeline for the last commit of a given branch is available at `/project/pipelines/[branch]/latest`.
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Also, `/project/pipelines/latest` redirects you to the latest pipeline for the last commit
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on the project's default branch.
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[Starting in GitLab 13.0](https://gitlab.com/gitlab-org/gitlab/-/issues/215367),
you can filter the pipeline list by:
- Trigger author
- Branch name
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- Status ([GitLab 13.1 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/217617))
- Tag ([GitLab 13.1 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/217617))
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- Source ([GitLab 14.3 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/338347))
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[Starting in GitLab 14.2](https://gitlab.com/gitlab-org/gitlab/-/issues/26621), you can change the
pipeline column to display the pipeline ID or the pipeline IID.
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If you use VS Code to edit your GitLab CI/CD configuration, the
[GitLab Workflow VS Code extension](../../user/project/repository/vscode.md) helps you
[validate your configuration](https://marketplace.visualstudio.com/items?itemName=GitLab.gitlab-workflow#validate-gitlab-ci-configuration)
and [view your pipeline status](https://marketplace.visualstudio.com/items?itemName=GitLab.gitlab-workflow#information-about-your-branch-pipelines-mr-closing-issue).
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### Run a pipeline manually
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Pipelines can be manually executed, with predefined or manually-specified [variables](../variables/index.md).
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You might do this if the results of a pipeline (for example, a code build) are required outside the normal
operation of the pipeline.
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To execute a pipeline manually:
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1. On the top bar, select **Menu > Projects** and find your project.
1. On the left sidebar, select **CI/CD > Pipelines**.
1. Select **Run pipeline**.
1. In the **Run for branch name or tag** field, select the branch or tag to run the pipeline for.
1. Enter any [environment variables](../variables/index.md) required for the pipeline to run.
You can set specific variables to have their [values prefilled in the form](#prefill-variables-in-manual-pipelines).
1. Select **Run pipeline**.
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The pipeline now executes the jobs as configured.
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#### Prefill variables in manual pipelines
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/30101) in GitLab 13.7.
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You can use the [`value` and `description`](../yaml/index.md#variablesdescription)
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keywords to define
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[pipeline-level (global) variables](../variables/index.md#create-a-custom-cicd-variable-in-the-gitlab-ciyml-file)
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that are prefilled when running a pipeline manually.
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In pipelines triggered manually, the **Run pipelines** page displays all top-level variables
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with a `description` and `value` defined in the `.gitlab-ci.yml` file. The values
can then be modified if needed, which overrides the value for that single pipeline run.
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The description is displayed next to the variable. It can be used to explain what
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the variable is used for, what the acceptable values are, and so on:
```yaml
variables:
DEPLOY_ENVIRONMENT:
value: "staging" # Deploy to staging by default
description: "The deployment target. Change this variable to 'canary' or 'production' if needed."
```
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You cannot set job-level variables to be pre-filled when you run a pipeline manually.
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### Run a pipeline by using a URL query string
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/24146) in GitLab 12.5.
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You can use a query string to pre-populate the **Run Pipeline** page. For example, the query string
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`.../pipelines/new?ref=my_branch&var[foo]=bar&file_var[file_foo]=file_bar` pre-populates the
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**Run Pipeline** page with:
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- **Run for** field: `my_branch`.
- **Variables** section:
- Variable:
- Key: `foo`
- Value: `bar`
- File:
- Key: `file_foo`
- Value: `file_bar`
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The format of the `pipelines/new` URL is:
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```plaintext
.../pipelines/new?ref=<branch>&var[<variable_key>]=<value>&file_var[<file_key>]=<value>
```
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The following parameters are supported:
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- `ref`: specify the branch to populate the **Run for** field with.
- `var`: specify a `Variable` variable.
- `file_var`: specify a `File` variable.
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For each `var` or `file_var`, a key and value are required.
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### Add manual interaction to your pipeline
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[Manual jobs](../jobs/job_control.md#create-a-job-that-must-be-run-manually),
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allow you to require manual interaction before moving forward in the pipeline.
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You can do this straight from the pipeline graph. Just select the play button
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to execute that particular job.
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For example, your pipeline can start automatically, but require a manual action to
[deploy to production](../environments/index.md#configure-manual-deployments).
In the example below, the `production` stage has a job with a manual action:
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![Pipelines example](img/manual_pipeline_v14_2.png)
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#### Start multiple manual actions in a stage
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> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/27188) in GitLab 11.11.
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Multiple manual actions in a single stage can be started at the same time using the "Play all manual"
After you select this action, each individual manual action is triggered and refreshed
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to an updated status.
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This functionality is only available:
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- For users with at least the Developer role.
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- If the stage contains [manual actions](#add-manual-interaction-to-your-pipeline).
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### Skip a pipeline
To push a commit without triggering a pipeline, add `[ci skip]` or `[skip ci]`, using any
capitalization, to your commit message.
Alternatively, if you are using Git 2.10 or later, use the `ci.skip` [Git push option](../../user/project/push_options.md#push-options-for-gitlab-cicd).
The `ci.skip` push option does not skip merge request
pipelines.
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### Delete a pipeline
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> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/24851) in GitLab 12.7.
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Users with the Owner role for a project can delete a pipeline
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by clicking on the pipeline in the **CI/CD > Pipelines** to get to the **Pipeline Details**
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page, then selecting **Delete**.
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![Pipeline Delete](img/pipeline-delete.png)
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Deleting a pipeline does not automatically delete its
[child pipelines](parent_child_pipelines.md).
See the [related issue](https://gitlab.com/gitlab-org/gitlab/-/issues/39503)
for details.
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WARNING:
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Deleting a pipeline expires all pipeline caches, and deletes all immediately
related objects, such as builds, logs, artifacts, and triggers.
**This action cannot be undone.**
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### Pipeline security on protected branches
A strict security model is enforced when pipelines are executed on
[protected branches](../../user/project/protected_branches.md).
The following actions are allowed on protected branches only if the user is
[allowed to merge or push](../../user/project/protected_branches.md)
on that specific branch:
- Run manual pipelines (using the [Web UI](#run-a-pipeline-manually) or [pipelines API](#pipelines-api)).
- Run scheduled pipelines.
- Run pipelines using triggers.
- Run on-demand DAST scan.
- Trigger manual actions on existing pipelines.
- Retry or cancel existing jobs (using the Web UI or pipelines API).
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**Variables** marked as **protected** are accessible only to jobs that
run on protected branches, preventing untrusted users getting unintended access to
sensitive information like deployment credentials and tokens.
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**Runners** marked as **protected** can run jobs only on protected
branches, preventing untrusted code from executing on the protected runner and
preserving deployment keys and other credentials from being unintentionally
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accessed. To ensure that jobs intended to be executed on protected
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runners do not use regular runners, they must be tagged accordingly.
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### How pipeline duration is calculated
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Total running time for a given pipeline excludes retries and pending
(queued) time.
Each job is represented as a `Period`, which consists of:
- `Period#first` (when the job started).
- `Period#last` (when the job finished).
A simple example is:
- A (1, 3)
- B (2, 4)
- C (6, 7)
In the example:
- A begins at 1 and ends at 3.
- B begins at 2 and ends at 4.
- C begins at 6 and ends at 7.
Visually, it can be viewed as:
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```plaintext
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0 1 2 3 4 5 6 7
AAAAAAA
BBBBBBB
CCCC
```
The union of A, B, and C is (1, 4) and (6, 7). Therefore, the total running time is:
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```plaintext
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(4 - 1) + (7 - 6) => 4
```
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## Visualize pipelines
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Pipelines can be complex structures with many sequential and parallel jobs.
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To make it easier to understand the flow of a pipeline, GitLab has pipeline graphs for viewing pipelines
and their statuses.
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Pipeline graphs can be displayed as a large graph or a miniature representation, depending on the page you
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access the graph from.
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GitLab capitalizes the stages' names in the pipeline graphs.
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### View full pipeline graph
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> Visualization improvements [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/276949) in GitLab 13.11.
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The [pipeline details page](#view-pipelines) displays the full pipeline graph of
all the jobs in the pipeline.
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You can group the jobs by:
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- Stage, which arranges jobs in the same stage together in the same column:
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![jobs grouped by stage](img/pipelines_graph_stage_view_v14_2.png)
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- [Job dependencies](#view-job-dependencies-in-the-pipeline-graph), which arranges
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jobs based on their [`needs`](../yaml/index.md#needs) dependencies.
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[Multi-project pipeline graphs](multi_project_pipelines.md#multi-project-pipeline-visualization) help
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you visualize the entire pipeline, including all cross-project inter-dependencies. **(PREMIUM)**
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If a stage contains more than 100 jobs, only the first 100 jobs are listed in the
pipeline graph. The remaining jobs still run as normal. To see the jobs:
- Select the pipeline, and the jobs are listed on the right side of the pipeline details page.
- On the left sidebar, select **CI/CD > Jobs**.
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### View job dependencies in the pipeline graph
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/298973) in GitLab 13.12.
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> - [Enabled by default](https://gitlab.com/gitlab-org/gitlab/-/issues/328538) in GitLab 14.0.
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> - [Feature flag removed](https://gitlab.com/gitlab-org/gitlab/-/issues/328538) in GitLab 14.2.
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You can arrange jobs in the pipeline graph based on their [`needs`](../yaml/index.md#needs)
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dependencies.
Jobs in the leftmost column run first, and jobs that depend on them are grouped in the next columns.
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For example, `test-job1` depends only on jobs in the first column, so it displays
in the second column from the left. `deploy-job1` depends on jobs in both the first
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and second column and displays in the third column:
![jobs grouped by needs dependency](img/pipelines_graph_dependency_view_v13_12.png)
To add lines that show the `needs` relationships between jobs, select the **Show dependencies** toggle.
These lines are similar to the [needs visualization](../directed_acyclic_graph/index.md#needs-visualization):
![jobs grouped by needs dependency with lines displayed](img/pipelines_graph_dependency_view_links_v13_12.png)
To see the full `needs` dependency tree for a job, hover over it:
![single job dependency tree highlighted](img/pipelines_graph_dependency_view_hover_v13_12.png)
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### Pipeline mini graphs
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Pipeline mini graphs take less space and can tell you at a
quick glance if all jobs passed or something failed. The pipeline mini graph can
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be found when you go to:
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- The pipelines index page.
- A single commit page.
- A merge request page.
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- The [pipeline editor](../pipeline_editor/index.md), [in GitLab 14.5](https://gitlab.com/gitlab-org/gitlab/-/issues/337514) and later.
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Pipeline mini graphs allow you to see all related jobs for a single commit and the net result
of each stage of your pipeline. This allows you to quickly see what failed and
fix it.
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Pipeline mini graphs only display jobs by stage.
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Stages in pipeline mini graphs are expandable. Hover your mouse over each stage to see the name and status, and select a stage to expand its jobs list.
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| Mini graph | Mini graph expanded |
|:-------------------------------------------------------------|:---------------------------------------------------------------|
| ![Pipelines mini graph](img/pipelines_mini_graph_simple.png) | ![Pipelines mini graph extended](img/pipelines_mini_graph.png) |
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### Pipeline success and duration charts
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Pipeline analytics are available on the [**CI/CD Analytics** page](../../user/analytics/ci_cd_analytics.md#pipeline-success-and-duration-charts).
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### Pipeline badges
Pipeline status and test coverage report badges are available and configurable for each project.
For information on adding pipeline badges to projects, see [Pipeline badges](settings.md#pipeline-badges).
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### Downstream pipelines
In the pipeline graph view, downstream pipelines ([Multi-project pipelines](multi_project_pipelines.md)
and [Parent-child pipelines](parent_child_pipelines.md)) display as a list of cards
on the right of the graph.
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#### Cancel or retry downstream pipelines from the graph view
> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/354974) in GitLab 15.0 [with a flag](../../administration/feature_flags.md) named `downstream_retry_action`. Disabled by default.
> - [Generally available and feature flag removed](https://gitlab.com/gitlab-org/gitlab/-/issues/357406) in GitLab 15.1.
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To cancel a downstream pipeline that is still running, select **Cancel** (**{cancel}**)
on the pipeline's card.
To retry a failed downstream pipeline, select **Retry** (**{retry}**)
on the pipeline's card.
![downstream pipeline actions](img/downstream_pipeline_actions.png)
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## Pipelines API
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GitLab provides API endpoints to:
- Perform basic functions. For more information, see [Pipelines API](../../api/pipelines.md).
- Maintain pipeline schedules. For more information, see [Pipeline schedules API](../../api/pipeline_schedules.md).
- Trigger pipeline runs. For more information, see:
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- [Triggering pipelines through the API](../triggers/index.md).
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- [Pipeline triggers API](../../api/pipeline_triggers.md).