KCNA Container Orchestration Practice Question
You need to run a stateful application that requires stable network identities and persistent storage per pod. Which Kubernetes resource is BEST suited?
⚠ Common exam trap
A common misconception is that Deployment can handle stateful workloads by using PersistentVolumeClaims, but Deployment pods lack stable identities and ordered startup/shutdown, which are essential for many stateful applications.
Answer choices
Why each option matters
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 choice because it is specifically designed for stateful applications that require stable, unique network identifiers (e.g., pod names like `web-0`, `web-1`) and persistent storage that persists across pod rescheduling. Each pod in a StatefulSet gets a dedicated PersistentVolumeClaim, and the ordinal index ensures consistent identity, which is critical for databases like Cassandra or MySQL.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
DaemonSet
Why it's wrong here
DaemonSets run one pod per node; not suitable for applications needing stable identities and storage per pod.
- ✓
StatefulSet
Why this is correct
StatefulSet provides stable pod identities and ordered deployment/ scaling, ideal for stateful workloads.
- ✗
Job
Why it's wrong here
Jobs are for batch processing that terminates; not for long-running stateful applications.
- ✗
Deployment
Why it's wrong here
Deployments provide identical, interchangeable pods without stable identities or guaranteed persistent storage.
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