This CKS practice question tests your understanding of system hardening. 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.
A pod is configured with a custom seccomp profile stored at /var/lib/kubelet/seccomp/custom-profile.json. The pod manifest uses securityContext.seccompProfile with type: Localhost and localhostProfile: "custom-profile.json". The pod fails to start with an error 'seccomp profile not found'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The custom-profile.json file is not present on the node filesystem.
Option C is correct because the error 'seccomp profile not found' indicates that the Kubernetes kubelet cannot locate the specified profile file on the node's filesystem. When using `type: Localhost`, the `localhostProfile` value is resolved relative to the kubelet's seccomp profile root directory (default `/var/lib/kubelet/seccomp`). If the file `custom-profile.json` does not exist at that path on the node, the pod will fail to start.
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 securityContext.seccompProfile.defaultRuntimeProfile field must be set to 'custom-profile.json'.
Why it's wrong here
defaultRuntimeProfile is not a valid field; the correct field is localhostProfile.
✗
The seccomp profile should be defined in the pod's annotations, not securityContext.
Why it's wrong here
Seccomp profiles can be specified via securityContext.seccompProfile; annotations are deprecated.
✓
The custom-profile.json file is not present on the node filesystem.
Why this is correct
The seccomp profile must be present on the node at the specified path. If it's missing, the pod cannot start.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The localhostProfile field must be an absolute path.
Why it's wrong here
It is relative to the seccomp root directory, not absolute.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that `localhostProfile` requires an absolute path, but in reality it is a relative path from the kubelet's seccomp directory, and the error 'not found' points to a missing file, not a path format issue.
Detailed technical explanation
How to think about this question
The kubelet's seccomp profile root is configured via the `--seccomp-profile-root` flag (default `/var/lib/kubelet/seccomp`). When `localhostProfile` is set to `custom-profile.json`, the kubelet looks for `/var/lib/kubelet/seccomp/custom-profile.json`. This file must be present on every node where the pod might be scheduled. In a real-world scenario, operators often use a DaemonSet or a node-level provisioning tool to ensure the profile file exists on all nodes, as missing profiles cause pod startup failures.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKS question in full detail.
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The custom-profile.json file is not present on the node filesystem. — Option C is correct because the error 'seccomp profile not found' indicates that the Kubernetes kubelet cannot locate the specified profile file on the node's filesystem. When using `type: Localhost`, the `localhostProfile` value is resolved relative to the kubelet's seccomp profile root directory (default `/var/lib/kubelet/seccomp`). If the file `custom-profile.json` does not exist at that path on the node, the pod will fail to start.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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