Jenkins

The most widely adopted open-source automation server for building CI/CD pipelines.

Documentation

Guide	Description
Jenkins Fundamentals	Architecture, pipelines, Jenkinsfile, agents, plugins, shared libraries, exercises
Command Cheat Sheet	Pipeline syntax, CLI commands, Groovy snippets, plugin reference
Interview Questions	38 questions from beginner to advanced with detailed answers

Key Features

• Automation — Automate testing, building, and deployment
• Plugins — Integrate with hundreds of tools and services
• Pipeline as Code — Define builds as code (Jenkinsfile)
• Distributed Builds — Scale with agent nodes
• Community — Active community and extensive documentation

Learning Path

1. Start with fundamentals — architecture, pipelines, Jenkinsfile, plugins
2. Keep the cheat sheet handy — pipeline syntax and CLI commands
3. Practice interview questions — 38 Q&A with detailed explanations

Quick Start

// Jenkinsfile — Declarative Pipeline
pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                sh 'npm install'
                sh 'npm run build'
            }
        }
        stage('Test') {
            steps {
                sh 'npm test'
            }
        }
        stage('Deploy') {
            when { branch 'main' }
            steps {
                sh './deploy.sh'
            }
        }
    }
    post {
        failure {
            mail to: 'team@example.com',
                 subject: "Build Failed: ${currentBuild.fullDisplayName}",
                 body: "Check: ${env.BUILD_URL}"
        }
    }
}

External Resources

Resource	Description
Jenkins Documentation	Official Jenkins docs
Jenkins Pipeline Tutorial	Pipeline tutorial for beginners
Scheduling Jenkins Jobs	CRON scheduling guide
Ansible + Docker CI/CD	Integration with Ansible and Docker
SonarQube Integration	Code quality with SonarQube