CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 running a web application that takes 60 seconds to start up. You need to configure probes so that Kubernetes waits for the application to fully start before checking its health and directing traffic to it. Which combination of probes should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Startup probe with failureThreshold=30 and periodSeconds=2, plus liveness and readiness probes
Option D is correct because a startup probe with a low failureThreshold and periodSeconds allows Kubernetes to wait up to 60 seconds (30 failures × 2 seconds) for the application to start, after which the liveness and readiness probes begin. This ensures the liveness probe does not kill the container prematurely during the slow startup, and the readiness probe only directs traffic once the app is fully ready.
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.
✗
Liveness probe with initialDelaySeconds=10 and readiness probe without delay
Why it's wrong here
The container may be restarted before it finishes starting up.
✗
Readiness probe with initialDelaySeconds=60 only
Why it's wrong here
Without a liveness probe, the container will not be restarted if it becomes unhealthy after startup.
✗
Liveness probe with initialDelaySeconds=60 and readiness probe with initialDelaySeconds=60
Why it's wrong here
This works but is less robust; a startup probe is recommended for slow-starting containers.
✓
Startup probe with failureThreshold=30 and periodSeconds=2, plus liveness and readiness probes
Why this is correct
The startup probe gives the container up to 60 seconds to start (30×2s), after which liveness and readiness probes take over.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often rely solely on initialDelaySeconds for liveness probes, not realizing that a startup probe provides a more robust mechanism for slow-starting containers by decoupling the startup grace period from the regular health-check cycle.
Detailed technical explanation
How to think about this question
Startup probes were introduced in Kubernetes 1.16 to handle slow-starting containers; they run until success, after which liveness and readiness probes take over. The failureThreshold × periodSeconds calculation defines the maximum startup time, and the startup probe has no initialDelaySeconds, so it begins immediately. In real-world scenarios, this is critical for Java applications or legacy services that require JVM warm-up or database migrations before serving traffic.
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 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.
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: Startup probe with failureThreshold=30 and periodSeconds=2, plus liveness and readiness probes — Option D is correct because a startup probe with a low failureThreshold and periodSeconds allows Kubernetes to wait up to 60 seconds (30 failures × 2 seconds) for the application to start, after which the liveness and readiness probes begin. This ensures the liveness probe does not kill the container prematurely during the slow startup, and the readiness probe only directs traffic once the app is fully ready.
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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