Tool cheatsheet

GitLab CI/CD 1 Cheatsheet

.gitlab-ci.yml snippets for stages, jobs, rules, caching, artifacts, services, environments and reuse.

Pipeline basics

Minimal pipeline — A .gitlab-ci.yml with three stages. Jobs in the same stage run in parallel.
Choose a Docker image — Run a job in a container image.
Define variables — Set variables for the whole pipeline or for one job. Store secrets in the project's CI/CD settings, not in this file.
Run setup and cleanup commands — Run commands before and after a job's script.
Pick a runner by tag — Run the job only on runners that have the tag.
Set a timeout and retries — Fail a job that runs too long, and retry it automatically on infrastructure failures.

Run only on the default branch — Use rules to control when a job is added to the pipeline.
Run for merge requests — Run a job in merge request pipelines.
Run only when files change — Run a job only if matching files changed.
Require a manual click — Add a play button so a person starts the job.
Allow a job to fail — Let the pipeline pass even if this job fails.
Avoid duplicate pipelines — Run branch pipelines only when there is no open merge request.
Run only on a schedule — Run a job only in scheduled pipelines, which you configure under Build, Pipeline schedules.

Cache dependencies — Reuse downloaded packages between pipelines. The key changes when the lock file does.
Pass files to later jobs — Keep build output so later jobs and people can download it.
Start a job as soon as dependencies finish — Skip waiting for the whole previous stage.
Run a job for several versions — Create one job per variable combination.
Start a database for tests — Run a service container beside the job.
Show test results in merge requests — Upload a JUnit report so failures show up in the merge request.

Deploy to an environment — Track deployments and their URL in GitLab.
Prevent concurrent deployments — Make deploy jobs run one at a time.
Build a Docker image — Build and push to the project's registry, using the predefined CI variables.
Share job settings — Define a hidden template job, and reuse it with extends.
Include other files — Include a template or a shared file from another project.
Trigger a downstream pipeline — Start a pipeline in another project.
Useful predefined variables — Common variables GitLab sets for every job.

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