This KCNA practice question tests your understanding of kubernetes fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 team observes that a Pod is stuck in CrashLoopBackOff. The Pod runs a single container with an entrypoint that exits with non-zero code after a few seconds. The team wants to inspect the container's logs to understand why it is crashing. Which command should they use?
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.
kubectl get pods
Why wrong: Lists Pods but does not show logs.
kubectl logs <pod-name> --previous
Shows logs from the previous container instance, useful for crash logs.
kubectl describe pod <pod-name>
Why wrong: Describes Pod status but not logs.
kubectl exec -it <pod-name> -- sh
Why wrong: Requires a running container; crashing Pod may not allow exec.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kubectl logs <pod-name> --previous
The `kubectl logs <pod-name> --previous` command retrieves the logs from the previous instance of a crashed container. Since the Pod is in CrashLoopBackOff, the current container has already exited, and the `--previous` flag accesses the logs of the last terminated container, which contains the crash output (e.g., the non-zero exit code and error messages). This is the direct way to see why the entrypoint failed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
kubectl get pods
Why it's wrong here
Lists Pods but does not show logs.
kubectl logs <pod-name> --previous
Why this is correct
Shows logs from the previous container instance, useful for crash logs.
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 describe pod <pod-name>
Why it's wrong here
Describes Pod status but not logs.
kubectl exec -it <pod-name> -- sh
Why it's wrong here
Requires a running container; crashing Pod may not allow exec.
Common exam traps
CNCF often tests the distinction between `kubectl logs` (which shows container output) and `kubectl describe pod` (which shows events and status), leading candidates to choose describe when they need actual log content.
Trap categories for this question
Command / output trap
Lists Pods but does not show logs.
Detailed technical explanation
Under the hood, when a container exits with a non-zero code, the kubelet records the exit code and retains the container's logs in the node's filesystem (typically under /var/log/pods/). The `--previous` flag instructs the kubelet to return logs from the terminated container instance rather than the current (restarting) one. In real-world scenarios, this is critical for debugging init containers or sidecars that fail before the main application starts, as the current container may have no logs yet.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: kubectl logs <pod-name> --previous — The `kubectl logs <pod-name> --previous` command retrieves the logs from the previous instance of a crashed container. Since the Pod is in CrashLoopBackOff, the current container has already exited, and the `--previous` flag accesses the logs of the last terminated container, which contains the crash output (e.g., the non-zero exit code and error messages). This is the direct way to see why the entrypoint failed.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This KCNA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the KCNA exam.
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