CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 cluster administrator notices that nodes are not joining the cluster after a kubeadm init. The kubelet logs show: 'failed to run Kubelet: could not init service: open /var/lib/kubelet/config.yaml: permission denied'. 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 kubelet configuration file has incorrect ownership or permissions.
The error message 'open /var/lib/kubelet/config.yaml: permission denied' indicates that the kubelet process does not have the necessary read permissions to access its configuration file. This is typically caused by incorrect file ownership (e.g., owned by root instead of the kubelet user) or restrictive file permissions (e.g., 600 instead of 644). Since kubelet runs as a systemd service, it requires appropriate access to this file to initialize properly.
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 kubelet is running out of disk space.
Why it's wrong here
Disk space issues would cause write errors, not permission denied on read.
✗
The kubelet is not able to reach the API server.
Why it's wrong here
This would cause a connection timeout, not a permission denied error.
✗
The kubelet binary is missing.
Why it's wrong here
Missing binary would cause 'command not found', not permission denied.
✓
The kubelet configuration file has incorrect ownership or permissions.
Why this is correct
Permission denied indicates the kubelet cannot read the config file.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'permission denied' with network connectivity issues or resource exhaustion, but the specific file path in the error message directly points to a filesystem permission problem.
Trap categories for this question
Command / output trap
Missing binary would cause 'command not found', not permission denied.
Detailed technical explanation
How to think about this question
The kubelet configuration file at /var/lib/kubelet/config.yaml is generated by kubeadm init and is typically owned by root:root with permissions 644. If the file is accidentally modified to have restrictive permissions (e.g., 600) or ownership is changed to a non-root user, the kubelet process (which runs as root by default) may still fail if SELinux or AppArmor policies are enforced. In containerized environments, the kubelet may run with reduced capabilities, making file permission issues more common.
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 CKA 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 CKA question in full detail.
Cluster Architecture, Installation & Configuration — This question tests Cluster Architecture, Installation & Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The kubelet configuration file has incorrect ownership or permissions. — The error message 'open /var/lib/kubelet/config.yaml: permission denied' indicates that the kubelet process does not have the necessary read permissions to access its configuration file. This is typically caused by incorrect file ownership (e.g., owned by root instead of the kubelet user) or restrictive file permissions (e.g., 600 instead of 644). Since kubelet runs as a systemd service, it requires appropriate access to this file to initialize properly.
What should I do if I get this CKA 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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