An example blue/green deployment

example.yml

apiVersion: v1
kind: Service
metadata:
  name: backend-service
spec:
  selector:
    app: backend
    color: blue
  type: NodePort
  ports:
    - name: backend-port
      port: 80
      protocol: TCP
      targetPort: 8080
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: backend-ingress
  annotations:
    kubernetes.io/ingress.global-static-ip-name: "backend-static-ip"
spec:
  backend:
    serviceName: backend-service
    servicePort: 80
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: backend-blue
spec:
  replicas: 1
  selector:
    matchLabels:
      app: backend
      color: blue
  template:
    metadata:
      labels:
        app: backend
        color: blue 
    spec:
      containers:
        - name: api
          image: gcr.io/project/app:latest
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
          livenessProbe:
            httpGet:
              path: /
              port: 8080
          env:
            - name: MY_POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: backend-green
spec:
  replicas: 1
  selector:
    matchLabels:
      app: backend
      color: green
  template:
    metadata:
      labels:
        app: backend
        color: green 
    spec:
      containers:
        - name: api
          image: gcr.io/project/app:latest
          imagePullPolicy: Always
          ports:
            - containerPort: 8080
          livenessProbe:
            httpGet:
              path: /
              port: 8080
          env:
            - name: MY_POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name