service-deployment.yaml

apiVersion: v1
kind: Service
metadata:
  name: [SERVICE]
  labels:
    app: [APP]
spec:
  selector:
    app: [APP]
  ports:
  - protocol: TCP
    port: 80
    name: [HTTP_APP]
    targetPort: 9000
  type: ClusterIP

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: [APP_DEPLOYMENT_BLUE]
  labels:
    app: [APP]
    version: [INITIAL_VERSION]
    subset: blue
spec:
  replicas: 2
  selector:
    matchLabels:
      app: [APP]
      version: [INITIAL_VERSION]
      subset: blue
  template:
    metadata:
      labels:
        app: [APP]
        version: [INITIAL_VERSION]
        subset: blue
    spec:
      containers:
      - name: [APP]
        image: [IMAGE_PATH]
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 9000
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: [APP_DEPLOYMENT_GREEN]
  labels:
    app: [APP]
    version: [INITIAL_VERSION]
    subset: green
spec:
  replicas: 2
  selector:
    matchLabels:
      app: [APP]
      version: [INITIAL_VERSION]
      subset: green
  template:
    metadata:
      labels:
        app: [APP]
        version: [INITIAL_VERSION]
        subset: green
    spec:
      containers:
      - name: [APP]
        image: [IMAGE_PATH]
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 9000