Lab
A Cloud Guru

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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Path Info

Level

Intermediate

Duration

1h 30m

Published

Mar 31, 2019

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
```
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
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.