This CKA practice question tests your understanding of workloads and scheduling. 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.
A StatefulSet named 'mysql' manages 3 replicas. You need to scale it down to 1 replica. What happens to the PersistentVolumeClaims (PVCs) of the removed pods?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The PVCs are retained to preserve data.
When a StatefulSet is scaled down, the PersistentVolumeClaims (PVCs) associated with the removed pods are retained by default. This is because StatefulSets are designed for stateful workloads where data persistence is critical; the PVCs remain to preserve data in case the pod is recreated or the StatefulSet is scaled up again. Kubernetes does not automatically delete PVCs when a StatefulSet pod is removed, as PVC lifecycle is independent of pod lifecycle.
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.
✓
The PVCs are retained to preserve data.
Why this is correct
StatefulSet does not delete PVCs when scaling down, to protect data.
Related concept
Read the scenario before looking for a memorised answer.
✗
The PVCs are automatically backed up before deletion.
Why it's wrong here
No automatic backup occurs; PVCs are simply retained.
✗
The PVCs are retained only if the pod with the highest ordinal is removed first.
Why it's wrong here
StatefulSet always removes the highest ordinal pod first, but PVCs are retained regardless.
✗
The PVCs are automatically deleted along with the pods.
Why it's wrong here
PVCs are not automatically deleted; they are retained to prevent data loss.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse StatefulSet PVC behavior with that of Deployments or Jobs, where pods and their volumes are ephemeral, leading them to incorrectly assume PVCs are automatically deleted on scale-down.
Detailed technical explanation
How to think about this question
StatefulSet uses ordinal indices (e.g., mysql-0, mysql-1, mysql-2) and each pod is bound to a unique PVC via a VolumeClaimTemplate. When scaling down, Kubernetes removes pods starting from the highest ordinal (e.g., mysql-2 first), but the PVCs remain in the namespace with their associated PersistentVolume (PV) still bound, preserving data. This behavior is controlled by the StatefulSet's podManagementPolicy (OrderedReady by default) and the PVC's reclaim policy; if the StorageClass has reclaimPolicy: Delete, the PV and underlying storage would be deleted only if the PVC is deleted manually, not automatically on scale-down.
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 and Scheduling — This question tests Workloads and Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The PVCs are retained to preserve data. — When a StatefulSet is scaled down, the PersistentVolumeClaims (PVCs) associated with the removed pods are retained by default. This is because StatefulSets are designed for stateful workloads where data persistence is critical; the PVCs remain to preserve data in case the pod is recreated or the StatefulSet is scaled up again. Kubernetes does not automatically delete PVCs when a StatefulSet pod is removed, as PVC lifecycle is independent of pod lifecycle.
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.
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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