Complete Jenkins CI/CD Project 🚀

🛠️ Step 1: Fork a Node.js Repository

1. Choose a Node.js repository – Select a sample Node.js project. Look for a basic app or a CRUD application that is suitable for CI/CD.

2. Fork the Repository – Create a fork of the selected repository. This forked repository will hold your code for the CI/CD setup.

🔗 Step 2: Set Up GitHub Integration with Jenkins

1. Create a Jenkins Job – In Jenkins, create a new pipeline or freestyle project job for your CI/CD pipeline.

2. Connect GitHub to Jenkins:

   • Go to the Jenkins job settings and select the "Source Code Management" section.

   • Add your forked GitHub repository URL.

3. Enable GitHub WebHooks – In GitHub, go to the repository settings and set up WebHooks to connect it to your Jenkins server.

   • This allows Jenkins to automatically detect changes in your repository and trigger builds.

📝 Step 3: Configure Your Jenkins Pipeline

1. Pipeline Script or Freestyle Job – If using a freestyle job, add build steps under the “Build” section. For a pipeline job, use a Jenkinsfile.

2. Shell Commands in Jenkins – In the "Execute Shell" section, use Docker Compose commands to build and run your application:

    docker-compose up -d --build
   

   • This command will start your app using Docker Compose, creating and running containers for each service defined in your docker-compose.yml.

🐳 Step 4: Create a Docker Compose File

1. Dockerfile – In the project’s root, ensure a Dockerfile is present. It should install dependencies, copy the code, and expose necessary ports. Example Dockerfile:

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

2. docker-compose.yml – Create a docker-compose.yml file that defines the services needed. Example docker-compose.yml:

    version: '3'
    services:
      app:
        build: .
        ports:
          - "3000:3000"
        environment:
          NODE_ENV: production
   

   • This file specifies the application service and any necessary configurations.

🚀 Step 5: Run the Jenkins Pipeline

1. Trigger the Build – Push changes to the forked repository or trigger the build manually in Jenkins.

2. Watch Jenkins Logs – Check the Jenkins console output to view the build, test, and deployment logs.

3. Verify Deployment – Once Jenkins completes the build, your Node.js app should be running in a Docker container on the specified port.