KCNA Container Orchestration Practice Question
Which Kubernetes resource is best suited for running a batch processing job that must complete successfully exactly once?
⚠ Common exam trap
CNCF often tests the distinction between one-time batch processing (Job) and recurring scheduled tasks (CronJob), so candidates mistakenly choose CronJob when the question specifies 'exactly once' rather than 'on a schedule'.
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
✓
Job
A Kubernetes Job is designed specifically for batch processing tasks that need to run to completion exactly once. It creates one or more Pods and ensures that a specified number of them successfully terminate, making it ideal for workloads like data processing or backups that must finish without retries or restarts.
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
DaemonSet runs a pod on each node.
- ✗
Deployment
Why it's wrong here
Deployment is for long-running stateless applications.
- ✗
CronJob
Why it's wrong here
CronJob is for scheduled jobs, not for one-time execution.
- ✓
Job
Why this is correct
A Job creates one or more pods and tracks successful completions, restarting pods only until the required count succeeds. This directly satisfies the stem's "complete successfully exactly once" constraint, unlike a Deployment or ReplicaSet, which maintain continuous availability rather than terminating after completion.
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