CI/CD Tutorial with Docker

Why Use Docker with CI/CD?

Docker ensures consistent environments across development, testing, and production. When combined with CI/CD, it creates a powerful pipeline for automated testing, building, and deployment.

1. Project Setup


# .dockerignore
.git
.env
node_modules

Dockerfile Example


FROM node:18
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 3000
CMD ["node", "app.js"]

2. GitHub Actions Pipeline

Automate testing and deployment with a GitHub Actions workflow.

.github/workflows/ci-cd.yml


name: CI/CD Pipeline

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Build Docker image
        run: docker build -t yourname/app:latest .

      - name: Test Application
        run: |
          docker run --rm -e TEST=true yourname/app npm test

      - name: Push to Docker Hub
        run: |
          docker login -u ${{ secrets.DOCKER_USER }} -p ${{ secrets.DOCKER_PASS }}
          docker tag yourname/app yourname/app:latest
          docker push yourname/app

3. Deploy with Docker

Use Docker Compose for easy deployment of your application.

docker-compose.yml


version: '3'
services:
  app:
    image: yourname/app:latest
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production

Key Takeaways

Use .dockerignore to exclude unnecessary files
Write multi-stage builds for optimized images
Use environment variables for configuration
Integrate security scanning in your pipeline

Ready to Level Up?

Try implementing this pipeline in your own project and share your experience in the comments below!

View Docker Docs