Question 221 of 997

Kubernetes Fundamentals →hardMultiple ChoiceObjective-mapped

Liveness Probe Failure: Container Restart

This KCNA practice question tests your understanding of kubernetes fundamentals. 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.

You create a Pod with a liveness probe that uses an HTTP GET on port 8080, path /healthz. The probe fails after the container starts. What will happen to the Pod?

A
The Pod will be marked as Unhealthy and removed from Service endpoints
Why wrong: Removal from Service endpoints is a readiness probe behavior, not liveness.
B
The container will be restarted automatically
Liveness probe failure triggers container restart.
C
The Pod will be evicted from the node
Why wrong: Eviction happens due to resource pressure or node failure, not liveness probe failure.
D
The Pod will be deleted and recreated on a different node
Why wrong: That is not automatic; the container is restarted in place.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The container will be restarted automatically

A liveness probe is designed to determine if a container is still running properly. When an HTTP GET liveness probe fails, kubelet considers the container unhealthy and automatically restarts it according to the Pod's restart policy (defaulting to Always). This ensures the container can recover from transient failures without manual intervention.

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.

✗
The Pod will be marked as Unhealthy and removed from Service endpoints
Why it's wrong here
Removal from Service endpoints is a readiness probe behavior, not liveness.
✓
The container will be restarted automatically
Why this is correct
Liveness probe failure triggers container restart.
Related concept
Read the scenario before looking for a memorised answer.
✗
The Pod will be evicted from the node
Why it's wrong here
Eviction happens due to resource pressure or node failure, not liveness probe failure.
✗
The Pod will be deleted and recreated on a different node
Why it's wrong here
That is not automatic; the container is restarted in place.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is confusing liveness probes with readiness probes: candidates often think a failing liveness probe removes the Pod from Service endpoints, but that is the job of a readiness probe, while liveness probes only trigger container restarts.

Detailed technical explanation

How to think about this question

Under the hood, kubelet executes the liveness probe at the configured periodSeconds (default 10s) and uses the failureThreshold (default 3) to determine when to restart the container. The restart is performed by the container runtime (e.g., containerd) via the CRI, which stops the existing container and starts a new one with the same Pod sandbox. In real-world scenarios, a misconfigured liveness probe (e.g., a path that returns 5xx under normal load) can cause unnecessary restarts and degrade service availability.

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 KCNA 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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this KCNA question test?

Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The container will be restarted automatically — A liveness probe is designed to determine if a container is still running properly. When an HTTP GET liveness probe fails, kubelet considers the container unhealthy and automatically restarts it according to the Pod's restart policy (defaulting to Always). This ensures the container can recover from transient failures without manual intervention.

What should I do if I get this KCNA question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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