app.yaml

kind: Service
apiVersion: v1
metadata:
  name: rainbow-deploys
spec:
  type: NodePort
  selector:
    app: rainbow-deploys
    # this is the key here - it allows us to match only pods of the currently active color
    color: __COLOR__
  ports:
  - protocol: TCP
    port: 8080
    nodePort: 31080
    name: http
  - protocol: TCP
    port: 8081
    nodePort: 31081
    name: tcp
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: rainbow-deploys-__COLOR__
  labels:
    app: rainbow-deploys
spec:
  replicas: 2
  selector:
    matchLabels:
      app: rainbow-deploys
  template:
    metadata:
      labels:
        app: rainbow-deploys
        color: __COLOR__
    spec:
      containers:
      - name: rainbow-deploy
        image: bdimcheff/rainbow-deploys:__COLOR__
        ports:
        - containerPort: 8080
        - containerPort: 8081