- A
Create a RuntimeClass resource with handler: runsc
The RuntimeClass defines the runtime handler (e.g., runsc) that corresponds to gVisor.
- B
Set the kubelet runtime flag --runtime-class=gvisor
Why wrong: There is no such kubelet flag; RuntimeClasses are cluster-scoped resources.
- C
Install a CRD for gVisor
Why wrong: RuntimeClass is a built-in resource; no CRD needed.
- D
Create a Pod with spec.runtimeClassName set to "gvisor"
Why wrong: Before using it, you must create a RuntimeClass resource defining the runtime.
Question 434 of 997
gVisor RuntimeClass Configuration
This CKS practice question tests your understanding of minimize microservice vulnerabilities. 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.
You need to use gVisor as a container runtime for a set of workloads in the cluster. Which Kubernetes resource must be created to reference the runtime class?
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
✓
Create a RuntimeClass resource with handler: runsc
Option A is correct because in Kubernetes, a RuntimeClass resource is used to select a container runtime configuration, such as gVisor. The RuntimeClass must specify the handler field set to 'runsc', which is the gVisor runtime binary. This resource is then referenced by pods via the `runtimeClassName` field to enforce sandboxed isolation.
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.
- ✓
Create a RuntimeClass resource with handler: runsc
Why this is correct
The RuntimeClass defines the runtime handler (e.g., runsc) that corresponds to gVisor.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set the kubelet runtime flag --runtime-class=gvisor
Why it's wrong here
There is no such kubelet flag; RuntimeClasses are cluster-scoped resources.
- ✗
Install a CRD for gVisor
Why it's wrong here
RuntimeClass is a built-in resource; no CRD needed.
- ✗
Create a Pod with spec.runtimeClassName set to "gvisor"
Why it's wrong here
Before using it, you must create a RuntimeClass resource defining the runtime.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse creating the RuntimeClass resource with simply setting a field on a Pod, forgetting that the RuntimeClass object must exist in the cluster first, and that gVisor does not require a CRD or kubelet flag.
Detailed technical explanation
How to think about this question
Under the hood, the RuntimeClass resource acts as a bridge between the pod spec and the CRI implementation. The handler 'runsc' corresponds to the gVisor `runsc` binary, which implements the OCI runtime spec and intercepts syscalls to provide a sandboxed kernel. A real-world scenario is running untrusted multi-tenant workloads where gVisor reduces the kernel attack surface, and the RuntimeClass must be created before any pod can reference it, otherwise the pod will fail with an admission error.
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
Learn the concepts, then practise the questions
- →
Minimize Microservice Vulnerabilities practice questions
Targeted practice on this topic area only
- →
All CKS questions
997 questions across all exam domains
- →
Certified Kubernetes Security Specialist CKS study guide
Full concept coverage aligned to exam objectives
- →
CKS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CKS practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Monitoring Logging and Runtime Security practice questions
Practise CKS questions linked to Monitoring Logging and Runtime Security.
Cluster Setup and Hardening practice questions
Practise CKS questions linked to Cluster Setup and Hardening.
System Hardening practice questions
Practise CKS questions linked to System Hardening.
Minimize Microservice Vulnerabilities practice questions
Practise CKS questions linked to Minimize Microservice Vulnerabilities.
Supply Chain Security practice questions
Practise CKS questions linked to Supply Chain Security.
Monitoring, Logging and Runtime Security practice questions
Practise CKS questions linked to Monitoring, Logging and Runtime Security.
Cluster Setup practice questions
Practise CKS questions linked to Cluster Setup.
Cluster Hardening practice questions
Practise CKS questions linked to Cluster Hardening.
CKS fundamentals practice questions
Practise CKS questions linked to CKS fundamentals.
CKS scenario practice questions
Practise CKS questions linked to CKS scenario.
CKS troubleshooting practice questions
Practise CKS questions linked to CKS troubleshooting.
Practice this exam
Start a free CKS practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Create a RuntimeClass resource with handler: runsc — Option A is correct because in Kubernetes, a RuntimeClass resource is used to select a container runtime configuration, such as gVisor. The RuntimeClass must specify the handler field set to 'runsc', which is the gVisor runtime binary. This resource is then referenced by pods via the `runtimeClassName` field to enforce sandboxed isolation.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More CKS practice questions
- Which flag is used to restrict the kubelet's ability to modify node status and pods?
- A Falco rule has priority `WARNING` and output: `Sensitive file opened (user=%user.name command=%proc.cmdline file=%fd.n…
- Falco detects a shell being opened inside a container. Which Falco rule field is used to specify the syscall condition f…
- A security audit reveals that a ServiceAccount named 'monitor' has a ClusterRoleBinding to the cluster-admin role. What…
- Match each Kubernetes security component to its description.
- Match each Kubernetes certificate type to its usage.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.