- A
Set the log level to ERROR only to reduce verbosity and avoid logging sensitive data.
Why wrong: This may still log sensitive data in error messages; also, it reduces overall observability.
- B
Add a sidecar container that reads the application's log file, redacts sensitive data, and writes to stdout.
Sidecar pattern allows log processing before storage, and is a common pattern in Kubernetes.
- C
Configure a LogCollector DaemonSet to filter logs at the node level.
Why wrong: LogCollector DaemonSets typically collect raw logs; filtering at node level is complex and not a standard practice.
- D
Modify the application code to stop logging sensitive data before redeploying.
Why wrong: While ideal, this may take longer; the question asks for a recommendation to address the immediate requirement.
CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. 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 application pod is logging sensitive data (e.g., passwords) to stdout. The security team requires that these logs be redacted before they are stored. Which approach should you recommend?
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
Add a sidecar container that reads the application's log file, redacts sensitive data, and writes to stdout.
Option B is correct because a sidecar container can share the application's log file via an emptyDir volume, read the raw logs, apply redaction logic (e.g., regex replacement of password patterns), and then output the sanitized logs to its own stdout. This approach satisfies the security requirement without modifying the application code or losing log verbosity, and it keeps the redaction logic decoupled from the main 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.
- ✗
Set the log level to ERROR only to reduce verbosity and avoid logging sensitive data.
Why it's wrong here
This may still log sensitive data in error messages; also, it reduces overall observability.
- ✓
Add a sidecar container that reads the application's log file, redacts sensitive data, and writes to stdout.
Why this is correct
Sidecar pattern allows log processing before storage, and is a common pattern in Kubernetes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a LogCollector DaemonSet to filter logs at the node level.
Why it's wrong here
LogCollector DaemonSets typically collect raw logs; filtering at node level is complex and not a standard practice.
- ✗
Modify the application code to stop logging sensitive data before redeploying.
Why it's wrong here
While ideal, this may take longer; the question asks for a recommendation to address the immediate requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the sidecar pattern as the preferred method for modifying or enriching log output without altering the primary application container, and the trap here is that candidates may incorrectly choose to modify application code (Option D) or rely on node-level filtering (Option C), both of which violate the principle of separation of concerns or introduce latency and security gaps.
Detailed technical explanation
How to think about this question
The sidecar pattern leverages Kubernetes' pod-level shared volumes (e.g., emptyDir) to allow the main application to write logs to a file rather than stdout, while the sidecar reads that file, applies redaction (e.g., using sed or a custom script), and writes the sanitized output to its own stdout. This design ensures that the original sensitive data never leaves the pod's filesystem, and the redaction logic can be updated independently by rolling out a new sidecar image. In a real-world scenario, this approach is commonly used with tools like Fluentd or Logstash as sidecars to perform field-level filtering before logs reach a central aggregator.
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.
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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FAQ
Questions learners often ask
What does this CKAD question test?
Application Observability and Maintenance — This question tests Application Observability and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a sidecar container that reads the application's log file, redacts sensitive data, and writes to stdout. — Option B is correct because a sidecar container can share the application's log file via an emptyDir volume, read the raw logs, apply redaction logic (e.g., regex replacement of password patterns), and then output the sanitized logs to its own stdout. This approach satisfies the security requirement without modifying the application code or losing log verbosity, and it keeps the redaction logic decoupled from the main container.
What should I do if I get this CKAD 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
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Last reviewed: Jun 30, 2026
This CKAD 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 CKAD exam.
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