DevOps Fundamentals: CI/CD Pipeline Setup with Jenkins and Docker

Introduction

DevOps combines development and operations to improve collaboration and automate software delivery. This tutorial covers essential DevOps concepts and tools.

Setting Up Jenkins

# Install Jenkins on Ubuntu
wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
echo "deb https://pkg.jenkins.io/debian binary/" | sudo tee /etc/apt/sources.list.d/jenkins.list
sudo apt update
sudo apt install jenkins

Docker Integration

# Dockerfile example
FROM node:14
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD ["npm", "start"]

CI/CD Pipeline Script

pipeline {
    agent any
    stages {
        stage("Build") {
            steps {
                sh "docker build -t myapp:latest ."
            }
        }
        stage("Test") {
            steps {
                sh "npm test"
            }
        }
        stage("Deploy") {
            steps {
                sh "docker run -d -p 3000:3000 myapp:latest"
            }
        }
    }
}

This tutorial introduces essential DevOps practices including continuous integration, deployment automation, and infrastructure as code.