- A
Startup probes only.
Why wrong: Startup probes delay liveness checks during initialization but do not handle runtime unresponsiveness.
- B
Liveness probes only.
Why wrong: Liveness probes restart unresponsive containers but do not manage traffic; pods may receive requests while still starting up.
- C
Readiness probes only.
Why wrong: Readiness probes control traffic but do not trigger restarts; an unresponsive pod would remain running.
- D
Both readiness and liveness probes.
Using both ensures traffic is only sent to ready pods and unresponsive pods are restarted, providing complete health management.
Question 167 of 1,000
Configure GKE Probes for Automatic Restart
This PDE practice question tests your understanding of ensuring solution quality. 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 company uses GKE to run microservices. They want to ensure the application restarts automatically if it becomes unresponsive. Which probes should they configure in their pod spec?
Quick Answer
The answer is both readiness and liveness probes. Liveness probes are the mechanism that tells Kubernetes when to restart a container; if a liveness probe fails, the kubelet automatically kills and restarts the container to recover from unresponsive states. Readiness probes, on the other hand, control whether a pod receives traffic, ensuring that only healthy, fully-initialized pods serve requests. On the Google Professional Data Engineer exam, this distinction is frequently tested in scenario-based questions about application resilience and self-healing clusters. A common trap is assuming a liveness probe alone is sufficient—without a readiness probe, a pod that is still starting up or temporarily overloaded could be prematurely restarted or forced to serve traffic while unready. Remember the memory tip: liveness keeps the container alive, readiness keeps the traffic flowing.
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
✓
Both readiness and liveness probes.
To ensure a pod restarts automatically when it becomes unresponsive, you need a liveness probe. However, the question asks which probes to configure, and the best practice is to use both readiness and liveness probes. The liveness probe restarts the container if it fails, while the readiness probe controls traffic routing, preventing requests from being sent to an unresponsive pod before the liveness probe triggers a restart. Option D is correct because it combines both for robust health management.
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.
- ✗
Startup probes only.
Why it's wrong here
Startup probes delay liveness checks during initialization but do not handle runtime unresponsiveness.
- ✗
Liveness probes only.
Why it's wrong here
Liveness probes restart unresponsive containers but do not manage traffic; pods may receive requests while still starting up.
- ✗
Readiness probes only.
Why it's wrong here
Readiness probes control traffic but do not trigger restarts; an unresponsive pod would remain running.
- ✓
Both readiness and liveness probes.
Why this is correct
Using both ensures traffic is only sent to ready pods and unresponsive pods are restarted, providing complete health management.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common misconception is that a liveness probe alone is sufficient for automatic restarts, but the trap here is that readiness probes are also needed to prevent traffic routing to the pod during the restart window, ensuring zero-downtime recovery.
Detailed technical explanation
How to think about this question
Under the hood, liveness probes use HTTP GET, TCP socket, or exec commands to periodically check container health; a failure triggers a container restart via the kubelet based on the `restartPolicy`. Readiness probes similarly check health but only update the pod's endpoint status in the Kubernetes service, preventing traffic from being sent to unhealthy pods. In a real-world scenario, a microservice with a memory leak might pass readiness checks initially but fail liveness checks later, causing a restart without dropping traffic if readiness is not also configured.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 PDE question test?
Ensuring solution quality — This question tests Ensuring solution quality — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Both readiness and liveness probes. — To ensure a pod restarts automatically when it becomes unresponsive, you need a liveness probe. However, the question asks which probes to configure, and the best practice is to use both readiness and liveness probes. The liveness probe restarts the container if it fails, while the readiness probe controls traffic routing, preventing requests from being sent to an unresponsive pod before the liveness probe triggers a restart. Option D is correct because it combines both for robust health management.
What should I do if I get this PDE 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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Last reviewed: Jul 4, 2026
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