- A
Disable the Gatekeeper webhook
Why wrong: Disabling bypasses policy.
- B
Check the audit logs of Gatekeeper
Why wrong: Audit logs are for periodic auditing, not real-time admission denial details.
- C
Reapply the Deployment YAML
Why wrong: Will still be rejected without fixing the issue.
- D
Describe the constraint and constraint template to see the denial reason
Describing shows violations and reasons.
Question 502 of 997
Debugging Gatekeeper Constraint Denials: Describe Constraint and Template
This CKS practice question tests your understanding of supply chain security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 OPA/Gatekeeper constraint requires that all images' registries match a pattern. A Deployment uses 'myregistry.io/app:v1'. The admission controller rejects it. The admin runs 'kubectl get constraints' and sees the constraint is active. What is the next debugging step?
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
✓
Describe the constraint and constraint template to see the denial reason
Option D is correct because when a Gatekeeper constraint is active but a resource is rejected, the next debugging step is to describe the constraint and its associated constraint template. The constraint template contains the Rego policy logic, and describing both objects reveals the specific denial reason, such as a pattern mismatch or a violation of the allowed registries list. This provides the exact error message from the OPA engine, enabling targeted troubleshooting without disabling or bypassing the admission controller.
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.
- ✗
Disable the Gatekeeper webhook
Why it's wrong here
Disabling bypasses policy.
- ✗
Check the audit logs of Gatekeeper
Why it's wrong here
Audit logs are for periodic auditing, not real-time admission denial details.
- ✗
Reapply the Deployment YAML
Why it's wrong here
Will still be rejected without fixing the issue.
- ✓
Describe the constraint and constraint template to see the denial reason
Why this is correct
Describing shows violations and reasons.
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 may think audit logs (Option B) are the primary source for real-time admission denials, when in fact the denial reason is embedded in the constraint’s status and admission response, not in periodic audit reports.
Detailed technical explanation
How to think about this question
Gatekeeper constraints are Kubernetes custom resources that reference a ConstraintTemplate containing Rego policies evaluated by OPA. When an admission request is denied, the constraint’s status field (e.g., `status.violations`) captures the denial message, including the specific Rego rule that failed and the violating resource details. Describing the constraint (`kubectl describe constraint <name>`) reveals this structured violation data, which is far more precise than generic audit logs or reapplying the resource.
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 CKS 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.
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.
- →
Supply Chain Security — study guide chapter
Learn the concepts, then practise the questions
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Supply Chain Security practice questions
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Certified Kubernetes Security Specialist CKS study guide
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FAQ
Questions learners often ask
What does this CKS question test?
Supply Chain Security — This question tests Supply Chain Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Describe the constraint and constraint template to see the denial reason — Option D is correct because when a Gatekeeper constraint is active but a resource is rejected, the next debugging step is to describe the constraint and its associated constraint template. The constraint template contains the Rego policy logic, and describing both objects reveals the specific denial reason, such as a pattern mismatch or a violation of the allowed registries list. This provides the exact error message from the OPA engine, enabling targeted troubleshooting without disabling or bypassing the admission controller.
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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