CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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.
You run 'kubectl get events' and see an event 'FailedScheduling' for a pod. What is the most common cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Insufficient node resources to meet the pod's requests
The 'FailedScheduling' event indicates that the Kubernetes scheduler could not find a suitable node to place the pod. The most common cause is insufficient node resources (CPU, memory, or ephemeral storage) to meet the pod's resource requests defined in the pod spec. The scheduler uses the `kube-scheduler` component to evaluate node fit based on predicates like `PodFitsResources`, and if no node satisfies the requested resources, the pod remains in a Pending state with this event.
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.
✓
Insufficient node resources to meet the pod's requests
Why this is correct
The scheduler cannot find a node that satisfies the pod's resource requirements.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pod's container image pull failed
Why it's wrong here
Image pull failures generate 'Failed' or 'ErrImagePull' events, not FailedScheduling.
✗
The liveness probe failed
Why it's wrong here
Liveness probe failures cause container restarts, not scheduling failures.
✗
The pod was deleted by a Deployment update
Why it's wrong here
Deployment updates cause pod termination and recreation, but not FailedScheduling.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'FailedScheduling' with pod runtime failures (like image pull or probe failures), but scheduling events occur before the pod is bound to a node, so only resource-related or node affinity issues apply.
Detailed technical explanation
How to think about this question
The scheduler's predicate `PodFitsResources` checks if a node has allocatable resources (capacity minus reserved for system daemons) greater than or equal to the sum of pod resource requests. A subtle behavior is that the scheduler also considers extended resources (e.g., GPU) and node taints/tolerations; if a node has a taint that the pod does not tolerate, it can also cause 'FailedScheduling' even if resources are sufficient. In real-world clusters, this often happens during autoscaling delays or when resource requests are set too high without corresponding node capacity.
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: Insufficient node resources to meet the pod's requests — The 'FailedScheduling' event indicates that the Kubernetes scheduler could not find a suitable node to place the pod. The most common cause is insufficient node resources (CPU, memory, or ephemeral storage) to meet the pod's resource requests defined in the pod spec. The scheduler uses the `kube-scheduler` component to evaluate node fit based on predicates like `PodFitsResources`, and if no node satisfies the requested resources, the pod remains in a Pending state with this event.
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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