docker-images/kubernetes/guestbook/redis-slave-deployment.yaml

apiVersion: apps/v1 #  for k8s versions before 1.9.0 use apps/v1beta2  and before 1.8.0 use extensions/v1beta1
kind: Deployment
metadata:
  name: redis-slave
spec:
  selector:
    matchLabels:
      app: redis
      role: slave
      tier: backend
  replicas: 2
  template:
    metadata:
      labels:
        app: redis
        role: slave
        tier: backend
    spec:
      containers:
        - name: slave
          image: gcr.io/google_samples/gb-redisslave:v1
          resources:
            requests:
              cpu: 100m
              memory: 100Mi
          env:
            - name: GET_HOSTS_FROM
              value: dns
              # If your cluster config does not include a dns service, then to
              # instead access an environment variable to find the master
              # service's host, comment out the 'value: dns' line above, and
              # uncomment the line below:
              # value: env
          ports:
            - containerPort: 6379