Why Marked Incorrect: CKAD-mock-series question

Kubernetes
#1

Hello community,

I recently deployed an nginx application (ckad15-depl-svcn) in Kubernetes with two replicas and exposed it using a NodePort service (ckad15-service-svcn). The service is configured to use port 30085 for both internal and external access. this is part of ckad mock series questions

For this question, please set the context to cluster3 by running:

kubectl config use-context cluster3

Create a Deployment named ckad15-depl-svcn with “two replicas” of nginx image and expose it using a service named ckad15-service-svcn.

Please be noted that service needs to be accessed from both inside and outside the cluster (use port 30085).

Create the service in the default namespace.

solution by kodekloud:

  • The following manifest can be used to create a deployment ckad15-depl-svcn with nginx image and 2 replicas.
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ckad15-depl-svcn
spec:
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
  • To access from outside the cluster, we use nodeport type of service.
apiVersion: v1
kind: Service
metadata:
  name: ckad15-service-svcn
spec:
  selector:
    app: nginx
  type: NodePort
  ports:
    - name: http
      port: 80
      targetPort: 80
      nodePort: 30085

Details

Is deployment ckad15-depl-svcn created?

Is service ckad15-service-svcn created?

Is service accessible from outside the cluster?

but when I checked

curl http://cluster3-node01:30085
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

even though I created deploy and service is with correct named
this is my answer

k get deploy ckad15-depl-svcn -o yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"apps/v1","kind":"Deployment","metadata":{"annotations":{},"creationTimestamp":null,"labels":{"app":"ckad15-depl-svcn"},"name":"ckad15-depl-svcn","namespace":"default"},"spec":{"replicas":2,"selector":{"matchLabels":{"app":"ckad15-depl-svcn"}},"strategy":{},"template":{"metadata":{"creationTimestamp":null,"labels":{"app":"ckad15-depl-svcn"}},"spec":{"containers":[{"image":"nginx","name":"nginx","resources":{}}]}}},"status":{}}
  creationTimestamp: "2024-05-28T03:43:43Z"
  generation: 1
  labels:
    app: ckad15-depl-svcn
  name: ckad15-depl-svcn
  namespace: default
  resourceVersion: "14277"
  uid: e71310ac-6000-467b-9666-ab016816dcc1
spec:
  progressDeadlineSeconds: 600
  replicas: 2
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: ckad15-depl-svcn
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: ckad15-depl-svcn
    spec:
      containers:
      - image: nginx
        imagePullPolicy: Always
        name: nginx
        resources: {}
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      terminationGracePeriodSeconds: 30

k get svc ckad15-service-svcn -o yaml
apiVersion: v1
kind: Service
metadata:
  annotations:
    kubectl.kubernetes.io/last-applied-configuration: |
      {"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"creationTimestamp":"2024-05-28T03:46:35Z","name":"ckad15-service-svcn","namespace":"default","resourceVersion":"14519","uid":"2cb772ab-f953-4880-811d-5a6eaed949a6"},"spec":{"clusterIP":"10.96.110.140","clusterIPs":["10.96.110.140"],"externalTrafficPolicy":"Cluster","internalTrafficPolicy":"Cluster","ipFamilies":["IPv4"],"ipFamilyPolicy":"SingleStack","ports":[{"nodePort":30085,"port":80,"protocol":"TCP","targetPort":80}],"selector":{"app":"ckad15-depl-svcn"},"sessionAffinity":"None","type":"NodePort"},"status":{"loadBalancer":{}}}
  creationTimestamp: "2024-05-28T03:47:27Z"
  name: ckad15-service-svcn
  namespace: default
  resourceVersion: "14601"
  uid: b7889ca6-6043-45d2-a1ae-a8fd602f78bc
spec:
  clusterIP: 10.96.110.140
  clusterIPs:
  - 10.96.110.140
  externalTrafficPolicy: Cluster
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  ipFamilyPolicy: SingleStack
  ports:
  - nodePort: 30085
    port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: ckad15-depl-svcn
  sessionAffinity: None
  type: NodePort
status:
  loadBalancer: {}

Despite achieving the expected result, this approach was marked as incorrect. Why?

Issues with CKAD Mock Exam Grading on KodeKloud
#2

I think the solution for the deployment is actually wrong; while your yaml is incomplete, it’s more correct. I did the following for this problem and the grader liked my answer, so while the solution uses labels like app: nginx, that’s wrong: the grader actually wanted app: ckad15-depl-svcn:

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: ckad15-depl-svcn
  name: ckad15-depl-svcn
spec:
  replicas: 2
  selector:
    matchLabels:
      app: ckad15-depl-svcn
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: ckad15-depl-svcn
    spec:
      containers:
      - image: nginx
        name: nginx
        resources: {}
status: {}

The service I did also passed the grader; it was

apiVersion: v1
kind: Service
metadata:
  creationTimestamp: null
  labels:
    app: ckad15-depl-svcn
  name: ckad15-service-svcn
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30085
  selector:
    app: ckad15-depl-svcn
  type: NodePort
status:
  loadBalancer: {}

I’m not sure what you got wrong – the “checks” are in images that didn’t copy over to your post – but that’s the answer. I’ll report that the answer given in the solution is actually wrong, but is not what the grader accepts.