CI CD

CI/CD Pipelines

Pipeline Architecture

Commit → Build → Test → Security Scan → Deploy → Verify → Monitor

Pipeline Best Practices

Build Stage

• Reproducible builds — Same input = same output
• Caching — Cache dependencies, build artifacts
• Parallel execution — Run independent jobs concurrently
• Artifact versioning — Tag artifacts with commit SHA

Test Stage

• Fast feedback — Unit tests first, integration later
• Parallelization — Split test suites across workers
• Flaky test management — Quarantine, don't ignore
• Coverage gates — Block PRs below threshold

Security Stage

• SAST — Static analysis on every commit
• Dependency scanning — Check for known CVEs
• Secret scanning — Prevent credential leaks
• Container scanning — Scan images before deploy

Deploy Stage

• Environment promotion — Dev → Staging → Prod
• Deployment gates — Approval for production
• Rollback capability — One-click rollback
• Blue-green/Canary — Safe production deployments

GitHub Actions Example

name: CI/CD Pipeline

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
      - run: npm ci
      - run: npm run build
      - uses: actions/upload-artifact@v4
        with:
          name: build
          path: dist/

  test:
    needs: build
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm ci
      - run: npm test -- --coverage

  deploy:
    needs: [build, test]
    if: github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/download-artifact@v4
      - run: ./deploy.sh

Metrics to Track

Troubleshooting

Common Issues

1. Flaky tests — Add retries, improve isolation
2. Slow builds — Profile, cache, parallelize
3. OOM errors — Increase resources or optimize
4. Timeouts — Check network, increase limits
5. Permission errors — Verify service account access