Estratégia de deployment blue-green

# Blue deployment (current production)
apiVersion: apps/v1
kind: Deployment
metadata:
  name: app-blue
spec:
  replicas: 3
  selector:
    matchLabels:
      app: myapp
      version: blue
  template:
    metadata:
      labels:
        app: myapp
        version: blue
---
# Service pointing to blue
apiVersion: v1
kind: Service
metadata:
  name: app-service
spec:
  selector:
    app: myapp
    version: blue  # Switch to 'green' after verification
  ports:
  - port: 80

# Update service selector to point to green
kubectl patch service app-service \
  -p '{"spec":{"selector":{"version":"green"}}}'

# Rollback to blue if needed
kubectl patch service app-service \
  -p '{"spec":{"selector":{"version":"blue"}}}'