CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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 have a Deployment with a liveness probe that fails intermittently, causing the pod to restart. You want to reduce the sensitivity of the probe so that it only restarts after 3 consecutive failures. Which probe parameter should you adjust?
Why wrong: initialDelaySeconds delays the start of the probe, but does not affect the failure count.
B
periodSeconds
Why wrong: periodSeconds controls the interval between probes, not the number of failures.
C
failureThreshold
Increasing failureThreshold to 3 means the container will only be restarted after 3 consecutive probe failures, reducing sensitivity.
D
successThreshold
Why wrong: successThreshold controls how many successes are needed to consider the probe successful after a failure, typically used for readiness probes.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
failureThreshold
The `failureThreshold` parameter defines the number of consecutive probe failures required before Kubernetes considers the probe to have failed and triggers the configured action (e.g., restarting the container). By default, this value is 3, but if it is set lower (e.g., 1), a single failure causes a restart. Increasing `failureThreshold` to 3 (or higher) ensures that the liveness probe only restarts the pod after three consecutive failures, thereby reducing sensitivity to transient issues.
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.
✗
initialDelaySeconds
Why it's wrong here
initialDelaySeconds delays the start of the probe, but does not affect the failure count.
✗
periodSeconds
Why it's wrong here
periodSeconds controls the interval between probes, not the number of failures.
✓
failureThreshold
Why this is correct
Increasing failureThreshold to 3 means the container will only be restarted after 3 consecutive probe failures, reducing sensitivity.
Related concept
Read the scenario before looking for a memorised answer.
✗
successThreshold
Why it's wrong here
successThreshold controls how many successes are needed to consider the probe successful after a failure, typically used for readiness probes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `failureThreshold` with `periodSeconds`, thinking that reducing the probe frequency (period) will reduce sensitivity, but the correct way to require multiple consecutive failures is to increase the `failureThreshold` value.
Detailed technical explanation
How to think about this question
Under the hood, the kubelet maintains a counter for each probe; each failure increments the counter, and each success resets it to zero. When the counter reaches `failureThreshold`, the kubelet executes the probe's failure action (e.g., restarting the container via the container runtime). This mechanism is defined in the Kubernetes API (specifically in the `Probe` struct) and is consistent across HTTP, TCP, and exec probes. In real-world scenarios, setting `failureThreshold` too low (e.g., 1) can cause unnecessary restarts due to network blips or temporary resource contention, while a higher value (e.g., 3 or 5) provides hysteresis to tolerate short-lived failures.
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 CKAD 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 CKAD question in full detail.
Application Observability and Maintenance — This question tests Application Observability and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: failureThreshold — The `failureThreshold` parameter defines the number of consecutive probe failures required before Kubernetes considers the probe to have failed and triggers the configured action (e.g., restarting the container). By default, this value is 3, but if it is set lower (e.g., 1), a single failure causes a restart. Increasing `failureThreshold` to 3 (or higher) ensures that the liveness probe only restarts the pod after three consecutive failures, thereby reducing sensitivity to transient issues.
What should I do if I get this CKAD 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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Question Discussion
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