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 AppArmor profile is loaded in 'complain' mode. What happens when a pod with that profile attempts an action that violates the profile?
The pod is terminated.
Why wrong: The pod is not terminated; the action is allowed.
The action is allowed but a log entry is created.
Complain mode allows the action and logs the violation.
The action is allowed and no log is generated.
Why wrong: In complain mode, violations are logged.
The action is blocked and an audit log is generated.
Why wrong: That describes enforce mode.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The action is allowed but a log entry is created.
In AppArmor, 'complain' mode (also known as 'learning' mode) allows all actions, including those that violate the profile, but logs the violation to the system audit log (typically via auditd or syslog). This is distinct from 'enforce' mode, which blocks violating actions. Therefore, when a pod runs with a profile in complain mode, prohibited actions are permitted and recorded.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The pod is terminated.
Why it's wrong here
The pod is not terminated; the action is allowed.
The action is allowed but a log entry is created.
Why this is correct
Complain mode allows the action and logs the violation.
Related concept
Read the scenario before looking for a memorised answer.
The action is allowed and no log is generated.
Why it's wrong here
In complain mode, violations are logged.
The action is blocked and an audit log is generated.
Why it's wrong here
That describes enforce mode.
Common exam traps
CNCF often tests the distinction between AppArmor modes, and the trap here is confusing 'complain' mode with 'enforce' mode, leading candidates to think violations are blocked or that no logging occurs.
Detailed technical explanation
AppArmor profiles are loaded via apparmor_parser and can be set to enforce or complain mode using the --complain flag. In complain mode, the kernel's LSM (Linux Security Module) hook allows the syscall but calls audit_log() to record the denial that would have occurred in enforce mode. This is useful for profile development: you can run an application in complain mode, collect all violations, then refine the profile before switching to enforce. The logs appear in /var/log/audit/audit.log or /var/log/syslog with type=AVC and apparmor="DENIED" even though the action succeeded.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
System Hardening — This question tests System Hardening — Read the scenario before looking for a memorised answer..
The correct answer is: The action is allowed but a log entry is created. — In AppArmor, 'complain' mode (also known as 'learning' mode) allows all actions, including those that violate the profile, but logs the violation to the system audit log (typically via auditd or syslog). This is distinct from 'enforce' mode, which blocks violating actions. Therefore, when a pod runs with a profile in complain mode, prohibited actions are permitted and recorded.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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