Rollback Deploy

   # Activate incident response team
   # Set up communication channels
   # Notify stakeholders immediately
   
   # Example emergency notification
   echo "🚨 ROLLBACK INITIATED
   Issue: Critical performance degradation after v1.3.0 deployment
   Action: Rolling back to v1.2.9
   ETA: 15 minutes
   Impact: Temporary service interruption possible
   Status channel: #incident-rollback-202401"

   # Verify current production version
   curl -s https://api.example.com/version
   kubectl get deployments -o wide
   
   # Check system status
   curl -s https://api.example.com/health | jq .
   
   # Identify target rollback version
   git tag --sort=-version:refname | head -5
   
   # Verify rollback target exists and is deployable
   git show v1.2.9 --stat

   # Check for database migrations since last version
   ./check-migrations.sh v1.2.9 v1.3.0
   
   # If migrations exist, plan database rollback
   # WARNING: Database rollbacks can cause data loss
   # Consider forward fix instead if migrations are present
   
   # Create database backup before rollback
   ./backup-database.sh "pre-rollback-$(date +%Y%m%d-%H%M%S)"

   # Prepare to redirect traffic
   # Option 1: Maintenance page
   ./enable-maintenance-mode.sh
   
   # Option 2: Load balancer management
   ./drain-traffic.sh --gradual
   
   # Option 3: Circuit breaker activation
   ./activate-circuit-breaker.sh

   # Kubernetes rollback
   kubectl rollout history deployment/app-deployment
   kubectl rollout undo deployment/app-deployment
   
   # Or rollback to specific revision
   kubectl rollout undo deployment/app-deployment --to-revision=3
   
   # Monitor rollback progress
   kubectl rollout status deployment/app-deployment --timeout=300s
   
   # Verify pods are running
   kubectl get pods -l app=your-app

   # List service history
   docker service ps app-service --no-trunc
   
   # Rollback to previous version
   docker service update --rollback app-service
   
   # Or update to specific image
   docker service update --image app:v1.2.9 app-service
   
   # Monitor rollback
   docker service ps app-service

   # Blue-Green deployment rollback
   ./switch-to-blue.sh  # or green, depending on current
   
   # Rolling deployment rollback
   ./deploy-version.sh v1.2.9 --rolling
   
   # Symlink-based rollback
   ln -sfn /releases/v1.2.9 /current
   sudo systemctl restart app-service

   # Update load balancer to point to old version
   aws elbv2 modify-target-group --target-group-arn $TG_ARN --targets Id=old-instance
   
   # Clear CDN cache if needed
   aws cloudfront create-invalidation --distribution-id $DIST_ID --paths \"/*\"
   
   # Update DNS if necessary (last resort, has propagation delay)
   # aws route53 change-resource-record-sets ...