- A
The pod is created and the label is automatically added
Why wrong: Gatekeeper does not mutate resources unless a mutating webhook is configured.
- B
The pod creation is denied with a message
Correct. The deny rule blocks admission and returns the message.
- C
Only the first pod without the label is denied; subsequent ones are allowed
Why wrong: Gatekeeper evaluates every request independently; no such caching.
- D
The pod is created but logged as a violation
Why wrong: Gatekeeper enforces admission by denying, not just logging.
Question 786 of 997
Enforcing Pod Labels with OPA Gatekeeper ConstraintTemplate
This CKS practice question tests your understanding of minimize microservice vulnerabilities. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
An administrator deploys a Gatekeeper ConstraintTemplate with the following Rego policy:
package k8srequiredlabels deny[{"msg": msg}] { input.request.kind.kind == "Pod" not input.request.object.metadata.labels["security-tier"] msg := "Pod must have label 'security-tier'"
}
After creating the Constraint, a user creates a Pod without the 'security-tier' label. What is the expected behavior?
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
✓
The pod creation is denied with a message
Option B is correct because the Gatekeeper ConstraintTemplate defines a Rego policy that denies any Pod creation request that lacks the 'security-tier' label. When the user creates a Pod without this label, the admission webhook evaluates the policy and returns a denial message 'Pod must have label 'security-tier'', preventing the Pod from being created. Gatekeeper operates as a validating admission webhook, so it rejects the request before the object is persisted in etcd.
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.
- ✗
The pod is created and the label is automatically added
Why it's wrong here
Gatekeeper does not mutate resources unless a mutating webhook is configured.
- ✓
The pod creation is denied with a message
Why this is correct
Correct. The deny rule blocks admission and returns the message.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Only the first pod without the label is denied; subsequent ones are allowed
Why it's wrong here
Gatekeeper evaluates every request independently; no such caching.
- ✗
The pod is created but logged as a violation
Why it's wrong here
Gatekeeper enforces admission by denying, not just logging.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The exam often tests the distinction between validating and mutating admission webhooks—candidates may mistakenly think Gatekeeper can auto-add labels (mutating behavior) or that it only logs violations (audit mode), but the Rego policy here uses 'deny' which causes immediate rejection.
Detailed technical explanation
How to think about this question
Gatekeeper uses the OPA (Open Policy Agent) engine to enforce Rego policies as a Kubernetes validating admission webhook. The ConstraintTemplate defines the Rego rule, and a Constraint instantiates it; when the webhook receives an AdmissionReview request, it evaluates the policy and returns an AdmissionResponse with 'allowed: false' and the denial message. In production, this ensures that non-compliant workloads are rejected at admission time, preventing them from ever running, which is critical for enforcing security baselines like mandatory labels.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Minimize Microservice Vulnerabilities — study guide chapter
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FAQ
Questions learners often ask
What does this CKS question test?
Minimize Microservice Vulnerabilities — This question tests Minimize Microservice Vulnerabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pod creation is denied with a message — Option B is correct because the Gatekeeper ConstraintTemplate defines a Rego policy that denies any Pod creation request that lacks the 'security-tier' label. When the user creates a Pod without this label, the admission webhook evaluates the policy and returns a denial message 'Pod must have label 'security-tier'', preventing the Pod from being created. Gatekeeper operates as a validating admission webhook, so it rejects the request before the object is persisted in etcd.
What should I do if I get this CKS 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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Last reviewed: Jul 4, 2026
This CKS 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 CKS exam.
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