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CKAD Practice Exam - Part 3

This lab is designed to help prepare for the kinds of tasks and scenarios encountered during the Certified Kubernetes Application Developer (CKAD) exam. Here, there is an opportunity to practice debugging applications in Kubernetes. We will locate a problem in the Kubernetes cluster and fix it.

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Lab Info
Level
Intermediate
Last updated
Sep 22, 2025
Duration
1h 30m

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Table of Contents
  1. Challenge

    Identify the broken object and save its name and summary data

    Become the root user so that we can write to the file:

    sudo -i
    

    Describe the broken service:

    kubectl describe service oauth-provider -n gem
    

    Note that the service's selector selects pods with the label role: oauth.

    Get a list of pods with labels in order to locate the pod(s) selected by the service:

    kubectl get pods --all-namespaces --show-labels
    

    Note that the pod called bowline has the role: oauth label.

    Save the name of the broken pod:

    vi /usr/ckad/broken-object-name.txt
    

    Put the word bowline in there.

    Save the JSON summary data for the broken pod to the specified file:

    kubectl get pod bowline -n gem -o json > /usr/ckad/broken-object.json
    
  2. Challenge

    Fix the problem

    Examine the broken pod more closely:

    kubectl describe pod bowline -n gem
    

    Based on the event log and pod status, it appears something may be wrong with the pod image. Look at the pod's container image, which appears to be misspelled. Edit the pod:

    kubectl edit pod bowline -n gem
    

    Fix the image name by changing it to nginx:1.15.9.

    Verify that the pod is now working:

    kubectl get pod bowline -n gem
    

    Test the broken service to make sure it is working:

    curl localhost:30080
    
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