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---
stage: Verify
group: Continuous Integration
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/#designated-technical-writers
type: reference
---
# Getting started with GitLab CI/CD
GitLab offers a [continuous integration](https://about.gitlab.com/stages-devops-lifecycle/continuous-integration/) service. For each commit or push to trigger your CI
[pipeline](../pipelines/index.md), you must:
- Add a [`.gitlab-ci.yml` file](#creating-a-gitlab-ciyml-file) to your repository's root directory.
- Ensure your project is configured to use a [Runner](#configuring-a-runner).
The `.gitlab-ci.yml` file tells the GitLab Runner what to do. A simple pipeline commonly has
three [stages](../yaml/README.md#stages):
- `build`
- `test`
- `deploy`
You do not need to use all three stages; stages with no jobs are ignored.
The pipeline appears under the project's **CI/CD > Pipelines** page. If everything runs OK (no non-zero
return values), you get a green check mark associated with the commit. This makes it easy to see
whether a commit caused any of the tests to fail before you even look at the job (test) log. Many projects use
GitLab's CI service to run the test suite, so developers get immediate feedback if they broke
something.
It's also common to use pipelines to automatically deploy
tested code to staging and production environments.
If you're already familiar with general CI/CD concepts, you can review which
[pipeline architectures](../pipelines/pipeline_architectures.md) can be used
in your projects. If you're coming over to GitLab from Jenkins, you can check out
our [reference](../migration/jenkins.md) for converting your pre-existing pipelines
over to our format.
This guide assumes that you have:
- A working GitLab instance of version 8.0+ or are using
[GitLab.com](https://gitlab.com).
- A project in GitLab that you would like to use CI for.
- Maintainer or owner access to the project
Let's break it down to pieces and work on solving the GitLab CI/CD puzzle.
## Creating a `.gitlab-ci.yml` file
Before you create `.gitlab-ci.yml` let's first explain in brief what this is
all about.
### What is `.gitlab-ci.yml`
The `.gitlab-ci.yml` file is where you configure what CI does with your project.
It lives in the root of your repository.
On any push to your repository, GitLab will look for the `.gitlab-ci.yml`
file and start jobs on _Runners_ according to the contents of the file,
for that commit.
Because `.gitlab-ci.yml` is in the repository and is version controlled, old
versions still build successfully, forks can easily make use of CI, branches can
have different pipelines and jobs, and you have a single source of truth for CI.
You can read more about the reasons why we are using `.gitlab-ci.yml` [in our
blog about it](https://about.gitlab.com/blog/2015/05/06/why-were-replacing-gitlab-ci-jobs-with-gitlab-ci-dot-yml/).
### Creating a simple `.gitlab-ci.yml` file
NOTE: **Note:**
A GitLab team member has made an [unofficial visual pipeline editor](https://unofficial.gitlab.tools/visual-pipelines/).
There is a [plan to make it an official part of GitLab](https://gitlab.com/groups/gitlab-org/-/epics/4069)
in the future, but it's available for anyone who wants to try it at the above link.
You need to create a file named `.gitlab-ci.yml` in the root directory of your
repository. This is a [YAML](https://en.wikipedia.org/wiki/YAML) file
so you have to pay extra attention to indentation. Always use spaces, not tabs.
Below is an example for a Ruby on Rails project:
```yaml
image: "ruby:2.5"
before_script:
- sudo apt-get update -qq && sudo apt-get install -y -qq sqlite3 libsqlite3-dev nodejs
- ruby -v
- which ruby
- gem install bundler --no-document
- bundle install --jobs $(nproc) "${FLAGS[@]}"
rspec:
script:
- bundle exec rspec
rubocop:
script:
- bundle exec rubocop
```
This is the simplest possible configuration that will work for most Ruby
applications:
1. Define two jobs `rspec` and `rubocop` (the names are arbitrary) with
different commands to be executed.
1. Before every job, the commands defined by `before_script` are executed.
The `.gitlab-ci.yml` file defines sets of jobs with constraints of how and when
they should be run. The jobs are defined as top-level elements with a name (in
our case `rspec` and `rubocop`) and always have to contain the `script` keyword.
Jobs are used to create jobs, which are then picked by
[Runners](../runners/README.md) and executed within the environment of the Runner.
What is important is that each job is run independently from each other.
If you want to check whether the `.gitlab-ci.yml` of your project is valid, there is a
[CI Lint tool](../lint.md) available in every project.
For more information and a complete `.gitlab-ci.yml` syntax, please read
[the reference documentation on `.gitlab-ci.yml`](../yaml/README.md).
### Push `.gitlab-ci.yml` to GitLab
Once you've created `.gitlab-ci.yml`, you should add it to your Git repository
and push it to GitLab.
```shell
git add .gitlab-ci.yml
git commit -m "Add .gitlab-ci.yml"
git push origin master
```
Now if you go to the **Pipelines** page you will see that the pipeline is
pending.
NOTE: **Note:**
If you have a [mirrored repository where GitLab pulls from](../../user/project/repository/repository_mirroring.md#pulling-from-a-remote-repository-starter),
you may need to enable pipeline triggering in your project's
**Settings > Repository > Pull from a remote repository > Trigger pipelines for mirror updates**.
You can also go to the **Commits** page and notice the little pause icon next
to the commit SHA.
Clicking on it you will be directed to the jobs page for that specific commit.
Notice that there is a pending job which is named after what we wrote in
`.gitlab-ci.yml`. "stuck" indicates that there is no Runner configured
yet for this job.
The next step is to configure a Runner so that it picks the pending jobs.
## Configuring a Runner
In GitLab, Runners run the jobs that you define in `.gitlab-ci.yml`. A Runner
can be a virtual machine, a VPS, a bare-metal machine, a Docker container or
even a cluster of containers. GitLab and the Runners communicate through an API,
so the only requirement is that the Runner's machine has network access to the
GitLab server.
A Runner can be specific to a certain project or serve multiple projects in
GitLab. If it serves all projects it's called a _Shared Runner_.
Find more information about different Runners in the
[Runners](../runners/README.md) documentation.
You can find whether any Runners are assigned to your project by going to
**Settings ➔ CI/CD**. Setting up a Runner is easy and straightforward. The
official Runner supported by GitLab is written in Go and its documentation
can be found at <https://docs.gitlab.com/runner/>.
In order to have a functional Runner you need to follow two steps:
1. [Install it](https://docs.gitlab.com/runner/install/)
1. [Configure it](https://docs.gitlab.com/runner/configuration/)
Follow the links above to set up your own Runner or use a Shared Runner as
described in the next section.
Once the Runner has been set up, you should see it on the Runners page of your
project, following **Settings ➔ CI/CD**.
### Shared Runners
If you use [GitLab.com](https://gitlab.com/) you can use the **Shared Runners**
provided by GitLab Inc.
These are special virtual machines that run on GitLab's infrastructure and can
build any project.
To enable the **Shared Runners** you have to go to your project's
**Settings ➔ CI/CD** and click **Enable shared runners**.
[Read more on Shared Runners](../runners/README.md).
## Seeing the status of your pipeline and jobs
After configuring the Runner successfully, you should see the status of your
last commit change from _pending_ to either _running_, _success_ or _failed_.
You can view all pipelines by going to the **Pipelines** page in your project.
Or you can view all jobs, by going to the **Pipelines ➔ Jobs** page.
By clicking on a job's status, you will be able to see the log of that job.
This is important to diagnose why a job failed or acted differently than
you expected.
You are also able to view the status of any commit in the various pages in
GitLab, such as **Commits** and **Merge requests**.
## Examples
Visit the [examples README](../examples/README.md) to see a list of examples using GitLab
CI with various languages.
|
