CI/CD Pipelines on Linux

1. Introduction

Continuous Integration (CI) and Continuous Deployment (CD) are essential practices in modern software development. They help automate the process of software delivery, enabling teams to deploy code changes more frequently and reliably.

2. Key Concepts

3. Setting Up CI/CD Pipelines on Linux

To set up a CI/CD pipeline on Linux, follow these steps:

Step 1: Install Required Tools

Make sure you have the following tools installed:

• Git: Version control system for tracking changes.
• Docker: For containerization.
• Jenkins or GitLab CI/CD: For orchestrating the CI/CD pipeline.

Step 2: Create a Simple Application

Develop a simple application. For instance, a basic Node.js application as shown below:

const express = require('express');
const app = express();
const port = 3000;

app.get('/', (req, res) => {
    res.send('Hello World!');
});

app.listen(port, () => {
    console.log(`App running on http://localhost:${port}`);
});

Step 3: Configure the CI/CD Tool

Here is a simple example of a Jenkinsfile for CI/CD:

pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                sh 'npm install'
            }
        }
        stage('Test') {
            steps {
                sh 'npm test'
            }
        }
        stage('Deploy') {
            steps {
                sh 'docker build -t myapp .'
                sh 'docker run -d -p 80:3000 myapp'
            }
        }
    }
}

Step 4: Triggering the Pipeline

Configure webhooks in your Git repository to trigger the pipeline on code commits automatically.

4. Best Practices

• Keep the pipeline fast by running tests in parallel.
• Use meaningful commit messages.
• Monitor your pipeline for failures.
• Automate as much as possible to reduce manual errors.

5. FAQ