SRJahirTech

DevOps Roadmap — Part 8: CI/CD Pipelines

DevOps ka real power yahan se start hota hai. Agar Docker muscles hai, toh CI/CD pipelines uska nervous system hain.

What Is CI/CD?

• CI — Continuous Integration
• CD — Continuous Delivery / Deployment

Simple words me: code likho → test ho → build ho → deploy ho automatically.

Problem Before CI/CD

• Manual testing
• Manual deployment
• Night-time production issues
• Blame game between dev & ops

CI/CD ne ye sab khatam kar diya.

Continuous Integration (CI)

CI ka matlab:

• Har code change version control me push hota hai
• Automatically build hota hai
• Tests run hote hain

Agar test fail → deploy ruk jata hai.

Continuous Delivery vs Deployment

• Delivery: deploy ready, manual approval
• Deployment: auto deploy without approval

Beginners ke liye pehle Delivery best hai.

Popular CI/CD Tools

• Jenkins
• GitHub Actions
• GitLab CI
• CircleCI

Industry me Jenkins + GitHub Actions sabse common.

CI/CD Pipeline Flow

1. Developer pushes code
2. Pipeline triggers
3. Build starts
4. Tests run
5. Docker image build
6. Deploy to server/cloud

Basic Jenkins Pipeline Example

pipeline {
  agent any

  stages {
    stage('Build') {
      steps {
        echo 'Building application'
      }
    }

    stage('Test') {
      steps {
        echo 'Running tests'
      }
    }

    stage('Deploy') {
      steps {
        echo 'Deploying application'
      }
    }
  }
}

Ye file batati hai Jenkins ko: kya, kab aur kaise karna hai.

GitHub Actions Example

name: CI Pipeline

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v3
    - name: Run build
      run: echo "Build successful"

Code push hote hi pipeline start ho jata hai.

CI/CD + Docker = Real DevOps

• Pipeline Docker image banata hai
• Image registry me push hoti hai
• Server image pull karta hai

Manual kaam almost zero.

Why CI/CD Is Mandatory

• Fast delivery
• Less human errors
• Reliable releases
• Easy rollback

Without CI/CD → DevOps incomplete.

Common Beginner Mistakes

• No tests in pipeline
• Secrets hardcode karna
• Single giant pipeline

What Comes Next?

Jab containers + pipelines ho jaye, toh next step hota hai: container orchestration.