devops-notes/08_Git_Basics.md

Git – Basics for DevOps (Day 8)

What is Git?

Git is a version control system. It helps you track changes in code and collaborate safely.

DevOps engineers use Git DAILY.

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Why Git is Important for DevOps?

• Track code changes
• Collaborate with teams
• Rollback broken deployments
• CI/CD depends on Git

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Install Git

git --version

If not installed:

sudo apt install git

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Configure Git (One-time Setup)

git config --global user.name "Your Name"
git config --global user.email "your@email.com"

Check config:

git config --list

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Create a Git Repository

mkdir devops-project
cd devops-project
git init

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Git Workflow (Basic)

1. Modify files
2. Stage changes
3. Commit changes

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Check Repository Status

git status

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Add Files to Staging

git add file.txt

Add all files:

git add .

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Commit Changes

git commit -m "Initial commit"

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View Commit History

git log

Short view:

git log --oneline

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Check File Differences

git diff

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Undo Changes (Basic)

Undo unstaged changes:

git checkout -- file.txt

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Real DevOps Scenario

Problem: New code broke production

Solution:

1. Check commit history
2. Roll back to stable commit

Git saves lives in production.

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Common Mistakes

• Committing without message
• Forgetting git add
• Working directly on main branch

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DevOps Rule

✅ Commit small changes
❌ Commit everything at once

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Summary

Today I learned Git basics: init, add, commit, status, and log. These are core DevOps skills.