CKS Monitoring, Logging and Runtime Security Practice Question
This CKS practice question tests your understanding of monitoring, logging and runtime security. 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.
You run 'kubectl exec -it <pod> -- /bin/sh' inside a pod that has an immutable root filesystem. What happens?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The shell starts successfully, but any attempt to write to the root filesystem will be denied
An immutable root filesystem (readOnlyRootFilesystem: true) prevents any writes to the container's root filesystem. However, /tmp is often a tmpfs mount that is writable, and /proc is a virtual filesystem. The exec command itself runs a process; it does not write to the filesystem. The shell can still run, but any attempt to write to the root filesystem will fail.
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 command fails with an error because the container has an immutable root filesystem
Why it's wrong here
The exec command runs a process; it does not write to the root filesystem. It only fails if the shell binary is not present.
✗
The shell starts and can write to any directory because 'exec' bypasses the restriction
Why it's wrong here
The restriction is enforced at the container level; exec does not bypass it.
✓
The shell starts successfully, but any attempt to write to the root filesystem will be denied
Why this is correct
The shell can run, but writes to the root filesystem (e.g., creating files in /) will fail due to readOnlyRootFilesystem.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pod is restarted with a writable filesystem
Why it's wrong here
The pod spec is not modified; the filesystem remains immutable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
The exec command runs a process; it does not write to the root filesystem. It only fails if the shell binary is not present.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which CKS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Monitoring, Logging and Runtime Security — This question tests Monitoring, Logging and Runtime Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The shell starts successfully, but any attempt to write to the root filesystem will be denied — An immutable root filesystem (readOnlyRootFilesystem: true) prevents any writes to the container's root filesystem. However, /tmp is often a tmpfs mount that is writable, and /proc is a virtual filesystem. The exec command itself runs a process; it does not write to the filesystem. The shell can still run, but any attempt to write to the root filesystem will fail.
What should I do if I get this CKS question wrong?
Identify which CKS exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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