This CKAD practice question tests your understanding of application deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 Deployment has replicas: 3 and uses a ConfigMap. The ConfigMap is updated. The developer wants to update the pods to use the new ConfigMap without recreating the Deployment. What is the correct approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl rollout restart deployment/<name>
A `kubectl rollout restart deployment/<name>` triggers a rolling restart of the Pods managed by the Deployment. Since ConfigMaps are mounted as volumes or injected as environment variables at Pod creation time, the only way to pick up updated ConfigMap data without recreating the Deployment object itself is to force the existing Pods to be terminated and recreated. The Deployment controller handles this gracefully, ensuring zero downtime by following the configured rolling update strategy.
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.
✓
kubectl rollout restart deployment/<name>
Why this is correct
Restarts pods, which will mount the updated ConfigMap.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl set image deployment/<name> <container>=<new-image>
Why it's wrong here
This changes image, not ConfigMap, but would trigger restart.
✗
The pods automatically mount the new ConfigMap within seconds
Why it's wrong here
ConfigMap updates are not automatically reflected in pods.
✗
Delete and recreate each pod manually
Why it's wrong here
Manual deletion is not the recommended approach; rollout restart is better.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume ConfigMaps are dynamically updated in running Pods (Option C), but in reality, Pods must be recreated to consume updated ConfigMap data unless the application explicitly watches for file changes.
Detailed technical explanation
How to think about this question
When a ConfigMap is mounted as a volume (not subPath), the inotify mechanism in the kubelet can detect changes and update the files on disk, but the application inside the container must watch for file changes or be restarted to use the new data. For environment variables, the values are injected at Pod creation and never updated. The `kubectl rollout restart` command works by adding a `kubectl.kubernetes.io/restartedAt` annotation to the Pod template, which causes the Deployment controller to create new ReplicaSets and scale down old ones, effectively restarting all Pods with the current ConfigMap data.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Application Deployment — This question tests Application Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl rollout restart deployment/<name> — A `kubectl rollout restart deployment/<name>` triggers a rolling restart of the Pods managed by the Deployment. Since ConfigMaps are mounted as volumes or injected as environment variables at Pod creation time, the only way to pick up updated ConfigMap data without recreating the Deployment object itself is to force the existing Pods to be terminated and recreated. The Deployment controller handles this gracefully, ensuring zero downtime by following the configured rolling update strategy.
What should I do if I get this CKAD 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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