GitLab is an open-source, powerful, resilient, extendable, protected, and effective software development and teamwork environment for the entire DevOps lifecycle.

It enables you to structure your development workflow; write code, and validate; package applications, and deploy them with its built-in continuous delivery capability; manage configurations automatically, and keep track of software performance.

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It offers features including an issue tracker, shifting issues among projects, time monitoring, highly capable branching utilities, file locking, merge requests, personalized alerts, project roadmaps, burndown charts for project and group milestones, and much more.

GitLab is one of the finest alternatives to GitHub for hosting your open-source projects available.

In this tutorial, we will walk you through the steps to install and set up GitLab (Git-repository manager) on RHEL-based and Debian-based systems.

Step 1: Install and Configure Necessary Dependencies

1. Begin by installing the essential dependencies using the yum or apt package manager as indicated.

<code>sudo yum install curl policycoreutils-python-utils [For RHEL-based]
sudo apt install curl policycoreutils-python-utils [For Debian-based]</code>

2. Then, install the Postfix service to send notification emails, activate it to launch at boot, and confirm its operational status with these commands.

<code>sudo yum install postfix    [For RHEL-based]
sudo apt install postfix    [For Debian-based]
<p>sudo systemctl start postfix
sudo systemctl enable postfix
sudo systemctl status postfix</p></code>

Throughout the Postfix setup, a configuration window may pop up. Choose ‘Internet Site’ and specify your server’s external DNS for ‘mail name’, then hit enter. Should additional prompts appear, proceed by pressing enter to accept the defaults.

Step 2: Add GitLab Repository and Install Package

3. Proceed by adding the GitLab package repository to your system via the following script.

On RHEL-based systems:

<code>curl <a href="http://ipnx.cn/link/c0b3cb0842f9f8148f618c587b48d5ba">http://ipnx.cn/link/c0b3cb0842f9f8148f618c587b48d5ba</a> | sudo bash</code>

On Debian-based systems:

<code>curl <a href="http://ipnx.cn/link/9e18189975e5454f9335f3f1a17e0aa9">http://ipnx.cn/link/9e18189975e5454f9335f3f1a17e0aa9</a> | sudo bash</code>

4. Subsequently, install the GitLab Community Edition package using the given command, ensuring to replace ‘http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0‘ with the desired URL to access your GitLab instance from a web browser.

On RHEL-based systems:

<code>sudo EXTERNAL_URL="<a href="http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0">http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0</a>" yum install -y gitlab-ce</code>

On Debian-based systems:

<code>sudo EXTERNAL_URL="<a href="http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0">http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0</a>" apt install -y gitlab-ee</code>

Note: To modify your primary URL, adjust it within the GitLab main configuration file /etc/gitlab/gitlab.rb under the external_url segment. After making changes, remember to reconfigure GitLab to implement the updates in the configuration file using this command:

<code>sudo gitlab-ctl reconfigure</code>

5. If your system firewall is active, open ports 80 (HTTP) and 443 (HTTPS) to permit connections in the system firewall.

On RHEL-based systems:

<code>sudo firewall-cmd --permanent --add-service=80/tcp
sudo firewall-cmd --permanent --add-service=443/tcp
sudo# systemctl reload firewalld</code>

On Debian-based systems:

<code>sudo ufw allow http
sudo ufw allow https
sydo ufw reload</code>

Step 3: Perform Initial GitLab Setup

6. Access your GitLab instance in a web browser using the URL defined during installation.

<code><a href="http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0">http://ipnx.cn/link/1d5988d346d89a4e49e0b43c0f0d28d0</a></code>

7. Upon your initial visit, you'll be directed to a password reset page; establish a new password for your new admin account and click “Change your password”. Following this, you'll be redirected to the login page where you can log in with the username root and the password you just set.

8. A successful login will bring you to the admin user account interface as depicted. Here, you can create entities, form groups, invite members, or customize your GitLab setup according to your needs. Additionally, you can modify your user profile, set up your email, link SSH keys to your GitLab instance, and other actions.

For further details, visit the GitLab About Page: http://ipnx.cn/link/feddfedc98490ed7e123db392f076fa1

That concludes our discussion! In this guide, we've outlined the procedure for installing and configuring GitLab (Git-repository manager) on RHEL-based and Debian-based Linux distributions. Feel free to leave any queries or contributions in the comments section below.

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