Building Your First CI/CD Pipeline

 🚀 Step-by-Step Guide: Building Your First CI/CD Pipeline

🔧 Prerequisites

A basic web app or service (Node.js, Python, etc.)

A GitHub account

Familiarity with Git

Docker (optional but useful)

1. Version Control with Git & GitHub

Make sure your project is tracked with Git and pushed to a GitHub repository.

bash

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git init

git add .

git commit -m "Initial commit"

git remote add origin https://github.com/your-username/your-repo.git

git push -u origin main

2. Define Project Structure

Example: Node.js project structure

bash

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/my-app

  ├── src/

  ├── tests/

  ├── package.json

  └── .github/workflows/ci.yml

3. Create GitHub Actions Workflow (CI)

In your repo, create .github/workflows/ci.yml:

yaml

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name: CI Pipeline

on:

  push:

    branches: [ main ]

  pull_request:

    branches: [ main ]

jobs:

  build-and-test:

    runs-on: ubuntu-latest

    steps:

    - name: Checkout code

      uses: actions/checkout@v3

    - name: Set up Node.js

      uses: actions/setup-node@v3

      with:

        node-version: '18'

    - name: Install dependencies

      run: npm install

    - name: Run tests

      run: npm test

This pipeline runs tests automatically on push or PR to the main branch.

4. Add a Simple Deployment Step (CD)

If you're deploying to, say, GitHub Pages or a simple server, append to your workflow:

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    - name: Deploy (example)

      run: echo "Deployment logic goes here"

For real deployments, you might use:

Heroku (easy for beginners)

Netlify / Vercel for front-end apps

Docker + SSH to deploy to a cloud VPS

5. Monitor & Iterate

Once your pipeline is running:

Check the Actions tab in GitHub

Watch your workflow in action

Fix failing tests or deployment errors

🔄 Optional Enhancements

Add Linting step with ESLint or Flake8

Use Docker to ensure consistent environments

Add Slack or Email notifications

Split build, test, and deploy into separate jobs

✅ Benefits You'll See

Early bug detection

Faster iteration with automatic tests

Reliable deployments

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