404 — Advanced CI/CD Patterns and Optimization

cat > .github/workflows/canary-deploy.yml << 'EOF'
name: Canary Deployment

on:
  push:
    branches: [main]

jobs:
  deploy-canary:
    runs-on: ubuntu-latest
    environment: production
    steps:
    - uses: actions/checkout@v4
    
    - name: Deploy to canary (10% traffic)
      run: |
        kubectl set image deployment/app-canary app=myapp:${{ github.sha }}
        kubectl patch service app -p '{"spec":{"selector":{"version":"canary"}}}'
        kubectl scale deployment/app-canary --replicas=1
        kubectl scale deployment/app-stable --replicas=9
    
    - name: Monitor canary for 10 minutes
      run: |
        for i in {1..10}; do
          ERROR_RATE=$(kubectl logs -l version=canary | grep ERROR | wc -l)
          if [ $ERROR_RATE -gt 10 ]; then
            echo "Canary showing errors, rolling back"
            kubectl scale deployment/app-canary --replicas=0
            kubectl scale deployment/app-stable --replicas=10
            exit 1
          fi
          sleep 60
        done
    
    - name: Promote canary to 100%
      if: success()
      run: |
        kubectl set image deployment/app-stable app=myapp:${{ github.sha }}
        kubectl scale deployment/app-stable --replicas=10
        kubectl scale deployment/app-canary --replicas=0
EOF

cat .github/workflows/canary-deploy.yml