DevOps Lesson 6: CI/CD with GitHub Actions
⚙️ DevOps CourseLesson 6 of 10 · 60% complete
CI/CD automates: run tests, build, and deploy on every code push. GitHub Actions is free for public repos and 2000 minutes/month for private.
Your First Workflow
# .github/workflows/ci.yml
name: CI
on:
push:
branches: [main, develop]
pull_request:
branches: [main]
jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4 # checkout code
- uses: actions/setup-node@v4 # setup Node.js
with:
node-version: "20"
cache: "npm"
- run: npm ci # install dependencies
- run: npm run lint # lint code
- run: npm test # run tests
- run: npm run build # buildFull CI/CD Pipeline
# Deploy job runs AFTER test passes
deploy:
needs: test # wait for test to complete
runs-on: ubuntu-latest
if: github.ref == 'refs/heads/main' # only on main branch
steps:
- uses: actions/checkout@v4
- name: Build Docker image
run: docker build -t myapp:${{ github.sha }} .
- name: Push to Docker Hub
run: |
echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
docker push myapp:${{ github.sha }}
- name: Deploy to Railway
run: npx railway up
env:
RAILWAY_TOKEN: ${{ secrets.RAILWAY_TOKEN }}🏋️ Practice Task
Set up a GitHub Actions workflow for your Node.js API: (1) Run on every push to main. (2) Install dependencies. (3) Run tests (create at least one test with Jest). (4) If tests pass, deploy to Railway automatically. Add secrets in GitHub Settings → Secrets.
💡 Hint: npm install -D jest. Create app.test.js. Add “test”:”jest” to package.json scripts.
