Deploying and exposing the frontend

Now it's getting pretty predictable and boring (exactly how deployments should be).

Run the following command:

kubectl apply -f https://k8s.io/examples/application/guestbook/frontend-deployment.yaml

To verify the deployment, run this code:

ab443838-9b3e-4811-b287-74e417a9@Azure:~$ kubectl apply -f https://k8s.io/examples/application/guestbook/frontend-deployment.yaml
 deployment.apps/frontend created
 ab443838-9b3e-4811-b287-74e417a9@Azure:~$ kc get pods
 NAME READY STATUS RESTARTS AGE
 frontend-56f7975f44-h9d78 0/1 Pending 0 2s
 frontend-56f7975f44-kw428 0/1 Pending 0 3s
 frontend-56f7975f44-nt55q 0/1 Pending 0 2s

You don't get any points for guessing that this Deployment specifies a replica count of 3 (OK, maybe a pat in the back; we are generous people). The Deployment has the usual suspects with minor changes as shown in the following code:

apiVersion: apps/v1 # for versions before 1.9.0 use apps/v1beta2
kind: Deployment
metadata:
  name: frontend
  labels:
    app: guestbook
spec:
  selector:
    matchLabels:
      app: guestbook
      tier: frontend
  replicas: 3
  template:
    metadata:
      labels:
        app: guestbook
        tier: frontend
    spec:
      containers:
      - name: php-redis
        image: gcr.io/google-samples/gb-frontend:v4
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        env:
        - name: GET_HOSTS_FROM
          value: dns
          # Using `GET_HOSTS_FROM=dns` requires your cluster to
          # provide a dns service. As of Kubernetes 1.3, DNS is a built-in
          # service launched automatically. However, if the cluster you are using
          # does not have a built-in DNS service, you can instead
          # access an environment variable to find the master
          # service's host. To do so, comment out the 'value: dns' line above, and
          # uncomment the line below:
          # value: env
        ports:
        - containerPort: 80

The replica count is set to 3, the labels are set to {app:guestbook, tier:frontend}, and the image used is gb-frontend:v4.