DevOps Classroom notes 23/Aug/2025

Version Control Systems

• Version control system is a software which
  • allows to collaborate work among the users to push their changes and get the changes done by others.
    
  • Tracks changes to files over time so that we can revert(rewind) to any past version adn also audit who changed what.
• Types of Version Control Systems
  • Local: (Rare) history and repo is maintained and used from a same machine.
  • Centralized: One centralized server(s) where clients push and pull changes.
    • Single source of truth (whole repo) on a server Client syncs with it.
    • Client Software is different from server software.
    • Server outage: team blocked
    • history lives centrally.
    • Examples: Subversion (svn), Clear case, TFVC
  • Distributed: Every one has a full history and any one can act as a server.
    • Each clone has a full repo (history + metadata + code)
    • Work is local first then shared
    • Any one can act as a server
    • Every one will have same software installed
    • Examples:
      • Git
      • Mercurial
• Git is de-facto standard today.

Git

• Wikipedia Git
• Developed by Linus Torvalds and is a free open source project.
• The core working of Git is all about understanding 5 areas of git.
  
• Core concepts:
  • Repository: This a storage space with versioning