DevOps Classroom Series – 17/Nov/2021

Types of Version Control Systems

• Centralized Version Control System
  • Overview:
  • The Centralized Version Control system has single point of failure i.e centralized repository. During maintenance there will be downtimes. If there is no proper backup/replication mechanism for this centralized you might loose everything.
  • Examples:
    • Subversion
    • IBM Clear Case
• Distributed Version Control System:
  • Overview
  • Every Workstation has a working copy and repository and to sychronize work done by multiple developers we would have a server with central repository.
  • In Distributed Version control systems a copy of repository is present on every machine using version control system, so there is no single point of failure
  • Examples:
    • mercurial
    • git

Distributed Version Control System (DVCS) => Git

• To synchronize the repositories across multiple systems we still maintain a central location i.e. the server in the below image
• Server in DVCS has the same software installed as all the nodes.
• The Centralized Server will have extra functionality
  • It needs to accept the requests from other workstation repositories, so these server have a service or a daemon where the expose the connectivity using protocols such as http, ssh
  • The server would have user management
• The Centralization part in the case of Git can be done in two ways
  • Hosting your own Git Servers in your Organization (Self-Hosting)
    • GitLab
    • Gitolite
    • BitBucket
  • Hosted Git Servers
    • GitHub
    • BitBucket
    • Code Commit
    • Azure Source Repos
    • GitLab