- A
privileged: false
Why wrong: This prevents privileged mode but does not enforce non-root user.
- B
readOnlyRootFilesystem: true
Why wrong: This makes the root filesystem read-only but does not enforce non-root user.
- C
allowPrivilegeEscalation: false
Why wrong: This prevents privilege escalation but does not require the container to run as non-root.
- D
runAsNonRoot: true
This field enforces that the container runs as a non-root user.
Question 882 of 997
Enforcing Non-Root Containers with runAsNonRoot — Kubernetes Security Context | Certified Kubernetes Security Specialist Explained
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 ensure that all containers in a pod run as non-root. Which security context field should you set to enforce this?
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
✓
runAsNonRoot: true
Setting `runAsNonRoot: true` in the pod or container security context instructs Kubernetes to verify that the container's user ID (UID) is non-zero (i.e., not root) before starting the container. If the container image is configured to run as root (UID 0), the Pod will fail to start, ensuring compliance with the requirement that all containers run as non-root.
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.
- ✗
privileged: false
Why it's wrong here
This prevents privileged mode but does not enforce non-root user.
- ✗
readOnlyRootFilesystem: true
Why it's wrong here
This makes the root filesystem read-only but does not enforce non-root user.
- ✗
allowPrivilegeEscalation: false
Why it's wrong here
This prevents privilege escalation but does not require the container to run as non-root.
- ✓
runAsNonRoot: true
Why this is correct
This field enforces that the container runs as a non-root user.
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 `runAsNonRoot: true` with `allowPrivilegeEscalation: false` or `privileged: false`, thinking that disabling privilege escalation or privileged mode is sufficient to enforce non-root execution, but those fields do not actually prevent the container from running as the root user.
Detailed technical explanation
How to think about this question
Under the hood, `runAsNonRoot: true` triggers a validation check in the kubelet's container runtime interface (CRI) that inspects the container's user namespace and the image's configured USER directive. If the image specifies USER root or no USER (defaulting to root), the Pod will be rejected with an error like 'container has runAsNonRoot and image will run as root'. This field is part of the PodSecurityContext and can be enforced at the namespace level via Pod Security Standards (e.g., the 'restricted' profile) to prevent root containers across the cluster.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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.
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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: runAsNonRoot: true — Setting `runAsNonRoot: true` in the pod or container security context instructs Kubernetes to verify that the container's user ID (UID) is non-zero (i.e., not root) before starting the container. If the container image is configured to run as root (UID 0), the Pod will fail to start, ensuring compliance with the requirement that all containers run as non-root.
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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