GitLab CI is an open-source continuous integration server

Requirements

GitLab CI officially supports (recent versions of) these Linux distributions:

• Ubuntu Linux
• Debian/GNU Linux
• CentOS
• RedHat Enterprise Linux (please use the CentOS packages and instructions)
• Scientific Linux (please use the CentOS packages and instructions)
• Oracle Linux (please use the CentOS packages and instructions)

Additionally GitLab CI requires:

• GitLab 7.7+ (to host the repositories you test)
• ruby 2.1.5
• MySQL or PostgreSQL

Hardware requirements:

• 1GB of memory or more is recommended, 512MB works
• 2 CPU cores or more are recommended, 1 CPU core works
• A little disk space, 100MB or less

Features

• Single Sign On: use the same login and password as on your GitLab instance
• Quick project setup: add your project in a single click, all setup automatic via the GitLab API
• Elegant and flexible: build scripts are written in bash, test projects in any programming language
• Merge request integration: see the status of the feature branch build within the Merge Request
• Distributed by default: GitLab CI and build runners can run on separate machines providing more stability
• Realtime logging: the current build log scrolls and updates every few seconds
• Parallel builds: split a build over multiple runners so it executes quickly

Installation

• Omnibus packages (recommended) now include the CI coordinator, see the configuration instructions
• Manual installation guide
• Unofficial Docker Image by Sameer Naik
• Unofficial Docker Image by Anastas Dancha is available via docker pull anapsix/gitlab-ci
• GitLab Development Kit is recommended for development work.

GitLab Runner

To perform the actual build you need to install GitLab Runner. The the next section about Architecture to understand what a runner does.

• GitLab Runner Omnibus package for Linux This is the recommended way to install GitLab Runner.
• GitLab Runner source code for Linux
• Unofficial GitLab Runner for Windows
• Unofficial GitLab Runner for Scala/Java
• Unofficial GitLab Runner for Node

Architecture

GitLab CI is a web application with an API that stores its state in a databse. It manages projects/builds and provides a nice user interface. It uses the GitLab application API to authenticate users.

GitLab Runner is a pure ruby application which processes builds. It can be deployed separately and works with GitLab CI through an API.

In order to run tests you need at least 1 GitLab CI instance and 1 GitLab Runner. However, for running several builds at the same time you may want to setup more than one GitLab Runner.

Possible Cases:

• 1 GitLab CI and N GitLab CI Runner instances on same machine
• 1 GitLab CI and N GitLab CI Runner instances on different machines
• 1 GitLab CI and N GitLab CI Runner instances on local machines

For more information see: Announcing GitLab CI 5.1 and Integrating GitLab CI With GitLab to Enable Distributed Builds

Versioning

After GitLab CI 5.4 we change versioning of project in favor of GitLab versions. That means we release GitLab and GitLab CI with same versions.

How to add a new project to GitLab CI

1. Log in the GitLab CI web interface
2. Press the 'Sync now' button
3. Select your project with the 'Add' button
4. Go to the settings page of the project and add a build script (example given below)
5. A new build should become visible on the project page of GitLab CI
6. If the build fails then adjust the build script and press the 'Retry' button on the build page
7. If the build is green you are done, all new commits will be tested and you see the status of merge requests builds within GitLab

Build script

For your information, the runner runs the line below before it runs the commands in your build script:

cd /gitlab-ci-runner/tmp/builds && git clone git@gitlab_server_fqdn:group/project.git project-1 && cd project-1 && git checkout master

Build script example:

bundle install
bundle exec rake db:create RAILS_ENV=test
bundle exec rake db:migrate RAILS_ENV=test
script/run_all_tests

The build command is run from GitlabCi::Build#command and contains the following environmental variables:

CI_SERVER, CI_SERVER_NAME, CI_SERVER_VERSION, CI_SERVER_REVISION
CI_BUILD_REF, CI_BUILD_BEFORE_SHA, CI_BUILD_REF_NAME (branch), CI_BUILD_ID

Documentation

All documentation can be found on doc.gitlab.com/ci/.

Getting help

Please see Getting help for GitLab on our website for the many options to get help.