Deploy Strategies

# canary-deployment.yaml: deploy v2 as a separate Deployment
apiVersion: apps/v1
kind: Deployment
metadata: { name: myapp-canary }
spec:
  replicas: 1     # keep small until ramping
  selector: { matchLabels: { app: myapp, version: v2 } }
  template:
    metadata: { labels: { app: myapp, version: v2 } }
    spec:
      containers: [{ name: web, image: myapp:v2 }]
---
apiVersion: v1
kind: Service
metadata: { name: myapp-canary }
spec:
  selector: { app: myapp, version: v2 }
  ports: [{ port: 80, targetPort: 3000 }]
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myapp-canary
  annotations:
    nginx.ingress.kubernetes.io/canary: "true"
    nginx.ingress.kubernetes.io/canary-weight: "10"   # 10% of traffic
spec:
  ingressClassName: nginx
  rules:
    - host: example.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service: { name: myapp-canary, port: { number: 80 } }