GitLab Community Edition is an open source application that allows a team or developer to manage their project on their own servers, it’s an alternative to GitHub. GitLab Community Edition is designed to be hosted on our own infrastructure, and it provides flexibility in deploying as an internal repository store for our development team, a public way to interface with users, or a means for contributors to host their own projects. GitLab also provides our teams a single data store, one user interface, and one permission model across the DevOps life-cycle allowing teams to collaborate that would significantly reduce cycle time and focus exclusively on building great software quickly. In this article, we will show you How to Install GitLab on Debian 9. GitLab will use some ports on your server, so we encourage you to install this on a fresh server to avoid any conflict with your existing applications. Prerequisites A fresh installed Debian 9 server A sudoer system user 8GB of memory or