KCNA Cloud Native Application Delivery Practice Question
A user reports that a ConfigMap update is not reflected in running pods. Which action should be taken to ensure pods receive the updated configuration?
⚠ Common exam trap
Candidates often assume Kubernetes automatically propagates ConfigMap changes to running pods, but in reality, pods are immutable after creation and require a restart to pick up new configuration.
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
✓
Perform a rollout restart of the deployment
A is correct because ConfigMaps are mounted into pods as volumes or consumed via environment variables at pod creation time. Kubernetes does not automatically propagate ConfigMap updates to running pods; the only way to pick up the new configuration is to restart the pods. A rollout restart of the deployment (e.g., `kubectl rollout restart deployment`) triggers a new ReplicaSet, which creates fresh pods that read the updated ConfigMap.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Perform a rollout restart of the deployment
Why this is correct
Triggers new pods with updated ConfigMap values.
- ✗
Delete and recreate the ConfigMap
Why it's wrong here
Does not trigger pod restart; pods still use old mount.
- ✗
Edit the deployment and change a label
Why it's wrong here
Does not cause pods to re-read ConfigMap unless it triggers a rollout.
- ✗
Restart the kubelet on the nodes
Why it's wrong here
Unnecessary; kubelet restart does not refresh pod envs/mounts.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This KCNA 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 KCNA exam.