This CKA practice question tests your understanding of workloads & scheduling. 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 are a platform engineer managing a Kubernetes cluster with 5 worker nodes (node1-node5). The cluster runs a mix of stateless web services and stateful databases. Users report that a critical database Pod (part of a StatefulSet) is frequently evicted during node maintenance. The StatefulSet has a single replica. You need to improve the availability of this database Pod. The current configuration: the Pod has resource requests (2 CPU, 4Gi memory) and limits (4 CPU, 8Gi memory). The cluster uses the default scheduler with no custom policies. Nodes have varying capacities: node1 and node2 have 8 CPU/32Gi memory, node3-node5 have 4 CPU/16Gi memory. During rolling node reboots, the database Pod gets evicted and takes a long time to reschedule because no node has enough resources. What should you do to minimize downtime and ensure the Pod is rescheduled promptly after eviction?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Why wrong: Node affinity only influences scheduling preferences but does not guarantee resources are available; during maintenance, those nodes might also be unavailable.
B
Create a PodDisruptionBudget with minAvailable: 1.
Why wrong: A PDB prevents voluntary disruptions but does not help the Pod get scheduled faster after eviction.
C
Assign a high priority class to the database Pod.
High priority ensures the scheduler preempts lower-priority Pods to make room for the database Pod, reducing scheduling delay.
D
Increase the resource requests to match the limits.
Why wrong: Higher requests make scheduling harder, not easier.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign a high priority class to the database Pod.
Assigning a high priority class (Option C) ensures that when the database Pod is evicted during node maintenance, the scheduler treats it as a higher-priority workload than other Pods. This allows it to preempt lower-priority Pods on nodes with sufficient capacity (e.g., node1 or node2), even if those nodes appear fully allocated, thereby minimizing downtime and ensuring prompt rescheduling.
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.
✗
Add nodeAffinity to prefer node1 and node2.
Why it's wrong here
Node affinity only influences scheduling preferences but does not guarantee resources are available; during maintenance, those nodes might also be unavailable.
✗
Create a PodDisruptionBudget with minAvailable: 1.
Why it's wrong here
A PDB prevents voluntary disruptions but does not help the Pod get scheduled faster after eviction.
✓
Assign a high priority class to the database Pod.
Why this is correct
High priority ensures the scheduler preempts lower-priority Pods to make room for the database Pod, reducing scheduling delay.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the resource requests to match the limits.
Why it's wrong here
Higher requests make scheduling harder, not easier.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between disruption budgets (which prevent eviction) and priority/preemption (which ensure rescheduling after eviction), leading candidates to mistakenly choose PDB when the real issue is resource contention after eviction.
Detailed technical explanation
How to think about this question
Priority classes in Kubernetes use a PriorityClass object with an integer value; the scheduler sorts pending Pods by priority and can preempt lower-priority Pods to free resources for higher-priority ones. Preemption is controlled by the scheduler's 'PreemptionPolicy' (defaults to PreemptLowerPriority), and the evicted Pod is re-queued with its original priority, ensuring it gets scheduled before other pending Pods. In this scenario, the database Pod with a high priority (e.g., 1000) would preempt stateless web service Pods on node1 or node2, which have enough total capacity (8 CPU/32Gi) to accommodate the database Pod's 2 CPU/4Gi requests.
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 CKA 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 CKA question in full detail.
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Assign a high priority class to the database Pod. — Assigning a high priority class (Option C) ensures that when the database Pod is evicted during node maintenance, the scheduler treats it as a higher-priority workload than other Pods. This allows it to preempt lower-priority Pods on nodes with sufficient capacity (e.g., node1 or node2), even if those nodes appear fully allocated, thereby minimizing downtime and ensuring prompt rescheduling.
What should I do if I get this CKA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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