Pipeline as Code

1. Pipeline as Code kya hota hai?

Pipeline as Code ka matlab hai:

CI/CD pipeline ko UI me click-click karke banane ke bajay
code file me likhna aur usko repository me store karna.

Jenkins me is file ko bolte hain:
👉 Jenkinsfile

Pipeline bhi code hai, jaise:

• Application code

• Infra code

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2. Pehle ka problem (UI-based pipeline)

Traditional Jenkins job:

• UI me steps add

• Manual changes

• Version history nahi

• Team ko samajh nahi aata pipeline ka flow

• Jenkins crash = pipeline gone

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3. Pipeline as Code kyun use karte hain?

Main reasons (real world):

• Pipeline ka version control

• Code review possible

• Reproducible builds

• Team collaboration

• Easy rollback

• DevOps best practice

Isliye companies UI jobs avoid karti hain.

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4. Pipeline as Code ka flow

Developer → Jenkinsfile → Git → Jenkins → Build/Test/Deploy

• Jenkinsfile repo me hota hai

• Code push hota hai

• Jenkins Jenkinsfile read karta hai

• Pipeline run hoti hai

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5. Jenkinsfile types

1️⃣ Declarative Pipeline (Recommended)

Simple, clean, structured.

pipeline {  agent any  stages {    stage('Build') {      steps {        echo 'Building...'      }    }    stage('Test') {      steps {        echo 'Testing...'      }    }  }}

Industry standard yehi hai.

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2️⃣ Scripted Pipeline (Advanced)

Powerful but complex.

node {  stage('Build') {    echo 'Build'  }}

Freshers ke liye declarative enough hai.

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6. Jenkinsfile kaha rakha jata hai?

• Project ke root directory me

• Naam: Jenkinsfile

• No extension

my-app/ ├── src/ ├── pom.xml └── Jenkinsfile

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7. Pipeline as Code ka use kaha hota hai?

• CI pipelines

• CD pipelines

• Jenkins + GitHub

• Jenkins + SonarQube

• Jenkins + Nexus

• Jenkins + Docker

• Jenkins + Kubernetes

Matlab end-to-end automation.

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8. Real CI pipeline Jenkinsfile example

pipeline {  agent any  stages {    stage('Checkout') {      steps {        git 'https://github.com/org/project.git'      }    }    stage('Build') {      steps {        sh 'mvn clean package'      }    }    stage('Test') {      steps {        sh 'mvn test'      }    }  }}

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9. Pipeline as Code vs UI Pipeline

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10. Interview one-liner

Pipeline as Code means defining CI/CD pipelines in code and storing them in version control, enabling versioning, collaboration, and repeatable automation.

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11. Simple language summary

• Pipeline bhi code hai

• Git me store hoti hai

• Jenkins khud pipeline read karta hai

• Team ke liye visible hoti hai

• Production ready approach hai