blue-green-deployment

name	Blue-Green Deployment
description	Zero-downtime deployment strategy with instant rollback capability. Use when: planning production deployments, implementing blue-green infrastructure, or setting up traffic switching.

Blue-Green Deployment

Zero-downtime deployment strategy using two identical environments.

When to Use

• Production deployments requiring zero downtime
• High-availability requirements
• Database migrations with backward compatibility
• Canary testing before full rollout

Architecture

┌─────────────┐     ┌─────────────┐
│   GREEN     │     │   BLUE      │
│  (current) │     │  (staging) │
└──────┬──────┘     └──────┬──────┘
       │                    │
       └────────┬─────────┘
                ▼
         ┌───────────┐
         │  Load     │
         │  Balancer │
         └───────────┘

Implementation Checklist

• Two identical environments provisioned
• Database schema migrations backward-compatible
• Traffic switching mechanism configured
• Health checks for both environments
• Rollback procedure documented
• Smoke tests defined

Rollback Procedure

# Instant rollback to green
kubectl rollout undo deployment/app-green
# OR for load balancer switch
aws elbv2 modify-listener --weights TargetGroupArn=green

For Supabase

Supabase doesn't support traditional blue-green. Use feature flags instead.