This CKAD practice question tests your understanding of application deployment. 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 company wants to deploy a stateful database cluster where each pod has its own persistent storage. They need stable network identities and ordered pod creation. Which resource should they use?
Deployment
Why wrong: Deployment does not guarantee stable identities or unique storage per pod.
StatefulSet
StatefulSet is designed for stateful apps with stable identities and persistent storage.
CronJob
Why wrong: CronJob is for scheduled tasks.
DaemonSet
Why wrong: DaemonSet runs a pod on each node, not suitable for clustered database.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
StatefulSet
StatefulSet is the correct resource because it provides stable, unique network identities (via headless Services and ordinal hostnames) and ordered, graceful deployment and scaling (pod creation/deletion in sequence). This matches the requirements for a stateful database cluster where each pod requires its own PersistentVolumeClaim (PVC) and stable identity for clustering.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Deployment
Why it's wrong here
Deployment does not guarantee stable identities or unique storage per pod.
StatefulSet
Why this is correct
StatefulSet is designed for stateful apps with stable identities and persistent storage.
Related concept
Read the scenario before looking for a memorised answer.
CronJob
Why it's wrong here
CronJob is for scheduled tasks.
DaemonSet
Why it's wrong here
DaemonSet runs a pod on each node, not suitable for clustered database.
Common exam traps
CNCF often tests the misconception that Deployment can handle stateful workloads by using PersistentVolumeClaims, but they fail to recognize that Deployment lacks stable network identities and ordered pod management, which are critical for database clustering.
Detailed technical explanation
StatefulSet uses a headless Service (clusterIP: None) to create DNS records for each pod in the format $(statefulset-name)-$(ordinal).$(service-name).namespace.svc.cluster.local, enabling stable network identities for clustering protocols like Raft or Paxos. The ordered pod creation (from index 0 to N-1) and deletion (reverse order) ensures that database replicas can be bootstrapped safely, and each pod’s PVC is retained even if the pod is rescheduled, preventing data loss.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Application Deployment — This question tests Application Deployment — Read the scenario before looking for a memorised answer..
The correct answer is: StatefulSet — StatefulSet is the correct resource because it provides stable, unique network identities (via headless Services and ordinal hostnames) and ordered, graceful deployment and scaling (pod creation/deletion in sequence). This matches the requirements for a stateful database cluster where each pod requires its own PersistentVolumeClaim (PVC) and stable identity for clustering.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CKAD practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKAD exam.
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