Blue-Green Deployment
Table of Contents
Overview
Deploy applications using blue-green deployment patterns to maintain two identical production environments, enabling instant traffic switching and rapid rollback capabilities.
When to Use
- Zero-downtime releases
- High-risk deployments
- Complex application migrations
- Database schema changes
- Rapid rollback requirements
- A/B testing with environment separation
- Staged rollout strategies
Quick Start
Minimal working example:
yaml# blue-green-setup.yaml apiVersion: v1 kind: ConfigMap metadata: name: blue-green-config namespace: production data: switch-traffic.sh: | #!/bin/bash set -euo pipefail CURRENT_ACTIVE="${1:-blue}" TARGET="${2:-green}" ALB_ARN="arn:aws:elasticloadbalancing:us-east-1:123456789012:loadbalancer/app/myapp-alb/1234567890abcdef" echo "Switching traffic from $CURRENT_ACTIVE to $TARGET..." # Get target group ARNs BLUE_TG=$(aws elbv2 describe-target-groups \ --load-balancer-arn "$ALB_ARN" \ --query "TargetGroups[?Tags[?Key=='Name' && Value=='blue']].TargetGroupArn" \ --output text) GREEN_TG=$(aws elbv2 describe-target-groups \ --load-balancer-arn "$ALB_ARN" \ // ... (see reference guides for full implementation)
Reference Guides
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Blue-Green with Load Balancer | Blue-Green with Load Balancer |
| Blue-Green Rollback Script | Blue-Green Rollback Script |
| Monitoring and Validation | Monitoring and Validation |
Best Practices
✅ DO
- Follow established patterns and conventions
- Write clean, maintainable code
- Add appropriate documentation
- Test thoroughly before deploying
❌ DON'T
- Skip testing or validation
- Ignore error handling
- Hard-code configuration values
