This CKS practice question tests your understanding of system hardening. 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 AppArmor to confine a container. They have loaded a profile named 'my-custom-profile' using apparmor_parser. Which annotation should be added to the pod to enforce this profile?
Option C is correct because the AppArmor annotation for pods follows the format `container.apparmor.security.beta.kubernetes.io/<container_name>` with the value `localhost/<profile_name>`. The `localhost/` prefix is required to indicate that the profile is loaded locally on the node, not a built-in or Kubernetes-managed profile. This annotation enforces the loaded 'my-custom-profile' on the specified container.
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 annotation key should contain the container name, not the profile name.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the exact annotation key format and the necessity of the `localhost/` prefix, leading candidates to omit the `container.` prefix or the `localhost/` value, or to confuse the annotation structure with other security contexts like seccomp or SELinux.
Detailed technical explanation
How to think about this question
AppArmor profiles are enforced at the node level via the Linux Security Module (LSM) and are loaded using `apparmor_parser`. The `localhost/` prefix in the annotation value tells kubelet to look for a profile loaded on the node's filesystem (typically under `/etc/apparmor.d/`), as opposed to a runtime/default profile. This mechanism is part of the Kubernetes beta feature 'AppArmor' (since v1.4) and requires the `AppArmor` feature gate to be enabled, though it is enabled by default in most distributions.
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.
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: container.apparmor.security.beta.kubernetes.io/<container_name>: localhost/my-custom-profile — Option C is correct because the AppArmor annotation for pods follows the format `container.apparmor.security.beta.kubernetes.io/<container_name>` with the value `localhost/<profile_name>`. The `localhost/` prefix is required to indicate that the profile is loaded locally on the node, not a built-in or Kubernetes-managed profile. This annotation enforces the loaded 'my-custom-profile' on the specified container.
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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Question Discussion
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