- A
RuntimeClass with handler: runsc
A RuntimeClass resource with handler set to 'runsc' (the gVisor runtime handler) allows pods to specify this runtime via runtimeClassName.
- B
CustomResourceDefinition for gVisor
Why wrong: No CRD needed; RuntimeClass is a built-in resource.
- C
PodSecurityPolicy with runtimeClass: gvisor
Why wrong: PodSecurityPolicy is deprecated and does not specify runtime class.
- D
ConfigMap with runtime handler mapping
Why wrong: ConfigMap is not used to define runtime classes.
Question 531 of 997
Deploying gVisor Container Runtime via RuntimeClass
This CKS practice question tests your understanding of minimize microservice vulnerabilities. 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.
An administrator wants to use gVisor as the container runtime for specific high-security workloads. After installing gVisor, what Kubernetes resource must be created to allow pods to request gVisor?
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
✓
RuntimeClass with handler: runsc
A is correct because gVisor uses a user-space kernel (runsc) that intercepts system calls. Kubernetes uses a RuntimeClass resource to tell the kubelet which container runtime handler to use for a pod. By creating a RuntimeClass with handler: runsc, pods can specify runtimeClassName: gvisor in their spec to request gVisor.
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.
- ✓
RuntimeClass with handler: runsc
Why this is correct
A RuntimeClass resource with handler set to 'runsc' (the gVisor runtime handler) allows pods to specify this runtime via runtimeClassName.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
CustomResourceDefinition for gVisor
Why it's wrong here
No CRD needed; RuntimeClass is a built-in resource.
- ✗
PodSecurityPolicy with runtimeClass: gvisor
Why it's wrong here
PodSecurityPolicy is deprecated and does not specify runtime class.
- ✗
ConfigMap with runtime handler mapping
Why it's wrong here
ConfigMap is not used to define runtime classes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
In the CNCF-CKS exam, candidates often confuse RuntimeClass (which selects the container runtime) with PodSecurityPolicy (which enforces security constraints). Remember that RuntimeClass is the mechanism to specify a non-default runtime like gVisor.
Detailed technical explanation
How to think about this question
The RuntimeClass resource defines a handler string (e.g., runsc) that matches a runtime handler configured in the container runtime (containerd or CRI-O). When a pod specifies runtimeClassName: gvisor, the kubelet passes the handler to the CRI, which launches the pod using gVisor's runsc instead of runc. This allows mixing runtimes in the same cluster, isolating high-security workloads with gVisor's additional syscall filtering.
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.
- →
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: RuntimeClass with handler: runsc — A is correct because gVisor uses a user-space kernel (runsc) that intercepts system calls. Kubernetes uses a RuntimeClass resource to tell the kubelet which container runtime handler to use for a pod. By creating a RuntimeClass with handler: runsc, pods can specify runtimeClassName: gvisor in their spec to request gVisor.
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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