This CKA practice question tests your understanding of workloads and scheduling. 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.
Which annotation is commonly used to trigger a rollout restart of a Deployment when a ConfigMap is updated?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl.kubernetes.io/restartedAt
Option D is correct because the annotation `kubectl.kubernetes.io/restartedAt` is commonly used with `kubectl rollout restart` to trigger a rolling restart of a Deployment. When a ConfigMap is updated, Pods using it via `envFrom` or `volumes` are not automatically updated; adding or updating this annotation on the Deployment's pod template forces a new ReplicaSet to be created, picking up the latest ConfigMap data.
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.
✗
configmap.kubernetes.io/update-trigger
Why it's wrong here
This is not a standard Kubernetes annotation.
✗
field.cattle.io/updateStrategy
Why it's wrong here
This is not a standard Kubernetes annotation.
✗
kubectl.kubernetes.io/last-applied-configuration
Why it's wrong here
This annotation stores the last applied configuration for diff purposes, not for triggering restarts.
✓
kubectl.kubernetes.io/restartedAt
Why this is correct
'kubectl rollout restart' uses this annotation to force a new rollout, which causes the pods to restart and pick up the new ConfigMap.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the annotation used for rollout restarts with non-existent or vendor-specific annotations, or they mistakenly think that updating a ConfigMap automatically triggers a Pod restart without any additional action.
Detailed technical explanation
How to think about this question
Under the hood, `kubectl rollout restart` works by adding the `kubectl.kubernetes.io/restartedAt` annotation with the current timestamp to the pod template spec of the Deployment. This change causes the Deployment controller to detect a difference in the pod template, triggering a new ReplicaSet and a rolling update. A subtle behavior is that this annotation is only effective when placed on the pod template; placing it on the Deployment itself has no effect. In real-world scenarios, this is commonly used in CI/CD pipelines to force Pods to reload ConfigMaps or Secrets that are mounted as volumes or injected as environment variables, since those resources are not automatically refreshed without a Pod restart.
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 practitioner preparing for the CKA 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Workloads and Scheduling — This question tests Workloads and Scheduling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl.kubernetes.io/restartedAt — Option D is correct because the annotation `kubectl.kubernetes.io/restartedAt` is commonly used with `kubectl rollout restart` to trigger a rolling restart of a Deployment. When a ConfigMap is updated, Pods using it via `envFrom` or `volumes` are not automatically updated; adding or updating this annotation on the Deployment's pod template forces a new ReplicaSet to be created, picking up the latest ConfigMap data.
What should I do if I get this CKA 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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