This CKS practice question tests your understanding of cluster setup and hardening. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A pod is failing with status 'CrashLoopBackOff'. The pod manifest includes a liveness probe that runs every 10 seconds. You suspect the probe is causing the crash. Which command would you use to verify the liveness probe configuration?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl describe pod <pod>
Option C is correct because `kubectl describe pod <pod>` displays the pod's full configuration, including the liveness probe's exact parameters (e.g., initialDelaySeconds, periodSeconds, failureThreshold, and the probe action like HTTP GET, TCP socket, or exec command). This allows you to verify if the probe is misconfigured (e.g., too aggressive or pointing to a non-existent endpoint) and causing the CrashLoopBackOff.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
kubectl logs <pod>
Why it's wrong here
Logs show the container's output but not the probe configuration.
This assumes the pod manifest is stored locally, which is not the case for most pods.
✓
kubectl describe pod <pod>
Why this is correct
'kubectl describe pod' shows the liveness probe configuration under the container section, including the command, initial delay, period, etc.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl get pod <pod> -o yaml
Why it's wrong here
While this also shows the probe, describe is more concise for troubleshooting.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between `kubectl describe` (human-readable, includes probe status and events) and `kubectl get -o yaml` (full API object, more verbose but less immediate for troubleshooting), leading candidates to pick the latter when the former is more efficient for verifying probe configuration.
Trap categories for this question
Command / output trap
Logs show the container's output but not the probe configuration.
Detailed technical explanation
How to think about this question
The liveness probe is defined in the pod spec under `spec.containers[].livenessProbe` and can be of type HTTP GET, TCP socket, or exec. The `kubelet` executes the probe based on `periodSeconds` (default 10) and restarts the container if `failureThreshold` consecutive probes fail (default 3). In a CrashLoopBackOff scenario, the kubelet applies exponential backoff (starting at 10s, doubling up to 5 minutes) after each restart, which can mask a misconfigured probe. Using `kubectl describe pod` reveals the probe's exact settings and the last probe result (e.g., 'Liveness probe failed: HTTP probe failed with statuscode: 503'), which is critical for diagnosing whether the probe itself is causing the crash.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CKS exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl describe pod <pod> — Option C is correct because `kubectl describe pod <pod>` displays the pod's full configuration, including the liveness probe's exact parameters (e.g., initialDelaySeconds, periodSeconds, failureThreshold, and the probe action like HTTP GET, TCP socket, or exec command). This allows you to verify if the probe is misconfigured (e.g., too aggressive or pointing to a non-existent endpoint) and causing the CrashLoopBackOff.
What should I do if I get this CKS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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