Kubernetes canary deployments with NGINX. No Flagger or Argo

canary-deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo-canary
spec:
  replicas: 1
  selector:
    matchLabels:
      app: echo
      version: canary
  template:
    metadata:
      labels:
        app: echo
        version: canary
    spec:
      containers:
      - name: echo-container
        image: hashicorp/http-echo:latest
        args:
          - -listen=:80
          - --text="Hello, Canary"
        ports:
        - containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: echo-canary-service
spec:
  selector:
    app: echo
    version: canary
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
  type: ClusterIP

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo
spec:
  replicas: 3
  selector:
    matchLabels:
      app: echo
  template:
    metadata:
      labels:
        app: echo
    spec:
      containers:
      - name: echo-container
        image: hashicorp/http-echo:latest
        args:
          - -listen=:80
          - --text="Hello, World"
        ports:
        - containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: echo-service
spec:
  selector:
    app: echo
  ports:
    - protocol: TCP
      port: 80
      targetPort: 80
  type: ClusterIP

ingresses.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: echo-ingress
spec:
  rules:
  - host: echo.example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: echo-service
            port:
              number: 80

---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: echo-canary-ingress
  annotations:
    nginx.ingress.kubernetes.io/canary: "true"
    nginx.ingress.kubernetes.io/canary-weight: "20" # percentage of traffic. You can also chose to run other stragies like cookie based, header based etc. 
spec:
  rules:
  - host: echo.example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: echo-canary-service
            port:
              number: 80