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Exercise 2: Create deployment and service YAML

Deployment

The deployment would be something like this (k8s/echoserver-deployment.yaml):

apiVersion: apps/v1
kind: Deployment
metadata:
  name: echoserver
spec:
  selector:
    matchLabels:
      app: frontend    # the label to match in the service yaml
  replicas: 1
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: echoserver
        image: k8s.gcr.io/echoserver:1.4
        ports:
        - containerPort: 8080

Apply the deployment with the command:

kubectl apply -f k8s/echoserver-deployment.yaml

Verify that the deployment is active:

kubectl get deployment -o wide

NAME         READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS   IMAGES                      SELECTOR
echoserver   1/1     1            1           32m   echoserver   k8s.gcr.io/echoserver:1.4   app=frontend

Service

Now create the service (k8s/echoserver-service.yaml):

apiVersion: v1
kind: Service
metadata:
  labels:
    app: echoserver
  name: echoserver
spec:
  type: NodePort
  ports:
  - port: 8080
    targetPort: 8080
  selector:
    app: frontend       # the deployment to map this service to

Apply the service:

kubectl apply -f k8s/echoserver-service.yaml

Verify that the service is active:

kubectl get service -o wide

NAME         TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)
echoserver   NodePort   10.101.174.60   <none>        8080:30486/TCP

Pay attention to the ports - 8080 is the internal port, and 30486 is the static port on each node.

Verify access

The cluster ip is the internal ip address of the service. To get the external address of the node, type:

kubectl get nodes -o wide

NAME       STATUS   ROLES    AGE   VERSION   INTERNAL-IP     EXTERNAL-IP
minikube   Ready    master   26h   v1.17.3   172.17.253.26   <none>

You now get the node's internal ip and the static port. To verify the access, use the url: 172.17.253.26:30486 in a browser.

or type (with admin rights):

minikube service echoserver -n my-namespace

which opens the web browser with the correct ip and port.

Cleanup

To cleanup deployment and service in one go, type:

kubectl delete -f k8s    # k8s is the folder containing the yaml files