• Configure the SSH port
• Create a directory for the volumes
• Find the GitLab version and edition to use
• Installation
  • Install GitLab by using Docker Compose
  • Install GitLab by using Docker Engine
  • Install GitLab by using Docker Swarm mode

Install GitLab in a Docker container

To install GitLab in a Docker container, use Docker Compose, Docker Engine, or Docker Swarm mode.

Prerequisites:

• You must have a working Docker installation that is not Docker for Windows. Docker for Windows is not officially supported as the images have known compatibility issues with volume permissions and potentially other unknown issues. If you are trying to run on Docker for Windows, see the getting help page. This page contains links to community resources (like IRC or forums) where you can seek help from other users.
• You must have a mail transport agent (MTA), such as Postfix or Sendmail. The GitLab images don’t include an MTA. You can install an MTA in a separate container. While you can install an MTA in the same container as GitLab, you might need to reinstall the MTA after every upgrade or restart.
• You should not plan to deploy the GitLab Docker image in Kubernetes as it creates a single point of failure. If you want to deploy GitLab in Kubernetes, use the GitLab Helm Chart or GitLab Operator instead.
• You must have a valid, externally accessible hostname for your Docker installation. Do not use localhost.

Configure the SSH port

By default, GitLab uses port 22 to interact with Git over SSH. To use port 22, skip this section.

To use a different port, you can either:

• Change the server’s SSH port now (recommended). Then the SSH clone URLs don’t need the new port number:

  ssh://git@gitlab.example.com/user/project.git
  

• Change the GitLab Shell SSH port after installation. Then the SSH clone URLs include the configured port number:

  ssh://git@gitlab.example.com:<portNumber>/user/project.git
  

To change the server’s SSH port:

1. Open /etc/ssh/sshd_config with your editor, and change the SSH port:

   Port = 2424
   

2. Save the file and restart the SSH service:

   sudo systemctl restart ssh
   

3. Verify that you can connect over SSH. Open a new terminal session and SSH to the server using the new port.

Create a directory for the volumes

Create a directory for the configuration files, logs, and data files. The directory can be in your user’s home directory (for example ~/gitlab-docker), or in a directory like /srv/gitlab.

1. Create the directory:

   sudo mkdir -p /srv/gitlab
   

2. If you’re running Docker with a user other than root, grant the appropriate permissions to the user for the new directory.

3. Configure a new environment variable $GITLAB_HOME that sets the path to the directory you created:

   export GITLAB_HOME=/srv/gitlab
   

4. Optionally, you can append the GITLAB_HOME environment variable to your shell’s profile so it is applied on all future terminal sessions:

   • Bash: ~/.bash_profile
   • ZSH: ~/.zshrc

The GitLab container uses host-mounted volumes to store persistent data:

Find the GitLab version and edition to use

In a production environment, you should pin your deployment to a specific GitLab version. Review the available versions and choose the version you want to use in the Docker tags page:

• GitLab Enterprise Edition tags
• GitLab Community Edition tags

The tag name consists of the following:

gitlab/gitlab-ee:<version>-ee.0

Where <version> is the GitLab version, for example 16.5.3. The version always includes <major>.<minor>.<patch> in its name.

For testing purposes, you can use the latest tag, such as gitlab/gitlab-ee:latest, which points to the latest stable release.

The following examples use a stable Enterprise Edition version. If you want to use the Release Candidate (RC) or nightly image, use gitlab/gitlab-ee:rc or gitlab/gitlab-ee:nightly instead.

To install the Community Edition, replace ee with ce.

Installation

You can run the GitLab Docker images by using:

• Docker Compose (recommended)
• Docker Engine
• Docker Swarm mode

Install GitLab by using Docker Compose

With Docker Compose you can configure, install, and upgrade your Docker-based GitLab installation:

1. Install Docker Compose.

2. Create a docker-compose.yml file. For example:

   version: '3.6'
   services:
     gitlab:
       image: gitlab/gitlab-ee:<version>-ee.0
       container_name: gitlab
       restart: always
       hostname: 'gitlab.example.com'
       environment:
         GITLAB_OMNIBUS_CONFIG: |
           # Add any other gitlab.rb configuration here, each on its own line
           external_url 'https://gitlab.example.com'
       ports:
         - '80:80'
         - '443:443'
         - '22:22'
       volumes:
         - '$GITLAB_HOME/config:/etc/gitlab'
         - '$GITLAB_HOME/logs:/var/log/gitlab'
         - '$GITLAB_HOME/data:/var/opt/gitlab'
       shm_size: '256m'
   

   Read the Pre-configure Docker container section to see how the GITLAB_OMNIBUS_CONFIG variable works.

   Here is another docker-compose.yml example with GitLab running on a custom HTTP and SSH port. Notice that the GITLAB_OMNIBUS_CONFIG variables match the ports section:

   version: '3.6'
   services:
     gitlab:
       image: gitlab/gitlab-ee:<version>-ee.0
       container_name: gitlab
       restart: always
       hostname: 'gitlab.example.com'
       environment:
         GITLAB_OMNIBUS_CONFIG: |
           external_url 'http://gitlab.example.com:8929'
           gitlab_rails['gitlab_shell_ssh_port'] = 2424
       ports:
         - '8929:8929'
         - '443:443'
         - '2424:22'
       volumes:
         - '$GITLAB_HOME/config:/etc/gitlab'
         - '$GITLAB_HOME/logs:/var/log/gitlab'
         - '$GITLAB_HOME/data:/var/opt/gitlab'
       shm_size: '256m'
   

   This configuration is the same as using --publish 8929:8929 --publish 2424:22.

3. In the same directory as docker-compose.yml, start GitLab:

   docker compose up -d
   

Install GitLab by using Docker Engine

Alternatively, you can install GitLab using Docker Engine.

1. If you’ve set up the GITLAB_HOME variable, adjust the directories to meet your requirements and run the image:

   • If you are not on SELinux, run this command:

      sudo docker run --detach \
        --hostname gitlab.example.com \
        --env GITLAB_OMNIBUS_CONFIG="external_url 'http://gitlab.example.com'" \
        --publish 443:443 --publish 80:80 --publish 22:22 \
        --name gitlab \
        --restart always \
        --volume $GITLAB_HOME/config:/etc/gitlab \
        --volume $GITLAB_HOME/logs:/var/log/gitlab \
        --volume $GITLAB_HOME/data:/var/opt/gitlab \
        --shm-size 256m \
        gitlab/gitlab-ee:<version>-ee.0
     

     This command downloads and starts a GitLab container, and publishes ports needed to access SSH, HTTP and HTTPS. All GitLab data are stored as subdirectories of $GITLAB_HOME. The container automatically restarts after a system reboot.

   • If you are on SELinux, then run this instead:

      sudo docker run --detach \
        --hostname gitlab.example.com \
        --env GITLAB_OMNIBUS_CONFIG="external_url 'http://gitlab.example.com'" \
        --publish 443:443 --publish 80:80 --publish 22:22 \
        --name gitlab \
        --restart always \
        --volume $GITLAB_HOME/config:/etc/gitlab:Z \
        --volume $GITLAB_HOME/logs:/var/log/gitlab:Z \
        --volume $GITLAB_HOME/data:/var/opt/gitlab:Z \
        --shm-size 256m \
        gitlab/gitlab-ee:<version>-ee.0
     

     This command ensures that the Docker process has enough permissions to create the configuration files in the mounted volumes.

2. If you’re using the Kerberos integration, you must also publish your Kerberos port (for example, --publish 8443:8443). Failing to do so prevents Git operations with Kerberos. The initialization process may take a long time. You can track this process with:

   sudo docker logs -f gitlab
   

   After starting the container, you can visit gitlab.example.com. It might take a while before the Docker container starts to respond to queries.

3. Visit the GitLab URL, and sign in with the username root and the password from the following command:

   sudo docker exec -it gitlab grep 'Password:' 
   /etc/gitlab/initial_root_password
   

Install GitLab by using Docker Swarm mode

With Docker Swarm mode, you can configure and deploy your GitLab installation with Docker in a swarm cluster.

In swarm mode, you can leverage Docker secrets and Docker configurations to efficiently and securely deploy your GitLab instance. Secrets can be used to securely pass your initial root password without exposing it as an environment variable. Configurations can help you to keep your GitLab image as generic as possible.

Here’s an example that deploys GitLab with four runners as a stack, using secrets and configurations:

1. Set up a Docker swarm.

2. Create a docker-compose.yml file:

   version: "3.6"
   services:
     gitlab:
       image: gitlab/gitlab-ee:<version>-ee.0
       container_name: gitlab
       restart: always
       hostname: 'gitlab.example.com'
       ports:
         - "22:22"
         - "80:80"
         - "443:443"
       volumes:
         - $GITLAB_HOME/data:/var/opt/gitlab
         - $GITLAB_HOME/logs:/var/log/gitlab
         - $GITLAB_HOME/config:/etc/gitlab
       shm_size: '256m'
       environment:
         GITLAB_OMNIBUS_CONFIG: "from_file('/omnibus_config.rb')"
       configs:
         - source: gitlab
           target: /omnibus_config.rb
       secrets:
         - gitlab_root_password
     gitlab-runner:
       image: gitlab/gitlab-runner:alpine
       deploy:
         mode: replicated
         replicas: 4
   configs:
     gitlab:
       file: ./gitlab.rb
   secrets:
     gitlab_root_password:
       file: ./root_password.txt
   

   To reduce complexity, the example above excludes the network configuration. You can find more information in the official Compose file reference.

3. Create a gitlab.rb file:

   external_url 'https://my.domain.com/'
   gitlab_rails['initial_root_password'] = File.read('/run/secrets/gitlab_root_password').gsub("\n", "")
   

4. Create a file called root_password.txt containing the password:

   MySuperSecretAndSecurePassw0rd!
   

5. Make sure you are in the same directory as docker-compose.yml and run:

   docker stack deploy --compose-file docker-compose.yml mystack
   

After you’ve installed Docker, you need to configure your GitLab instance.