CKA Practice Question: Cluster Architecture, Installation & Configuration
This CKA practice question tests your understanding of cluster architecture, installation & configuration. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
```
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master NotReady control-plane,master 10d v1.28.0
node1 Ready <none> 10d v1.28.0
$ kubectl describe node master | grep -A5 Conditions
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 CalicoIsUp Calico is running on this node
MemoryPressure False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletHasSufficientPID kubelet has sufficient PID available
Ready False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletNotReady container runtime is down
```
Refer to the exhibit. The master node shows NotReady status. The kubelet is reporting 'container runtime is down'. Which command should be used to investigate and fix this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
```
$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
master NotReady control-plane,master 10d v1.28.0
node1 Ready <none> 10d v1.28.0
$ kubectl describe node master | grep -A5 Conditions
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
NetworkUnavailable False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 CalicoIsUp Calico is running on this node
MemoryPressure False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletHasSufficientPID kubelet has sufficient PID available
Ready False Mon, 01 Jan 2024 12:00:00 +0000 Mon, 01 Jan 2024 12:00:00 +0000 KubeletNotReady container runtime is down
```
A
kubectl delete node master && kubeadm reset
Why wrong: Incorrect. This is drastic and unnecessary. The issue is likely a stopped runtime service, not a corrupted node.
B
systemctl status kubelet && systemctl restart kubelet
Why wrong: Incorrect. Restarting kubelet won't help if the runtime is down. The issue is the runtime, not kubelet.
C
systemctl status containerd && systemctl restart containerd
Correct. The container runtime (containerd) is likely stopped or crashed. Restarting it should resolve the issue.
D
systemctl status docker && systemctl restart docker
Why wrong: Incorrect. The exhibit does not specify Docker; kubeadm typically uses containerd. Assuming Docker may be wrong.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
systemctl status containerd && systemctl restart containerd
The kubelet is unable to communicate with the container runtime. Since the master uses containerd (common in kubeadm), checking the containerd service status and restarting it is the first step.
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.
✗
kubectl delete node master && kubeadm reset
Why it's wrong here
Incorrect. This is drastic and unnecessary. The issue is likely a stopped runtime service, not a corrupted node.
✗
systemctl status kubelet && systemctl restart kubelet
Why it's wrong here
Incorrect. Restarting kubelet won't help if the runtime is down. The issue is the runtime, not kubelet.
✓
systemctl status containerd && systemctl restart containerd
Why this is correct
Correct. The container runtime (containerd) is likely stopped or crashed. Restarting it should resolve the issue.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
systemctl status docker && systemctl restart docker
Why it's wrong here
Incorrect. The exhibit does not specify Docker; kubeadm typically uses containerd. Assuming Docker may be wrong.
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.
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 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.
Identify which CKA 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.
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: systemctl status containerd && systemctl restart containerd — The kubelet is unable to communicate with the container runtime. Since the master uses containerd (common in kubeadm), checking the containerd service status and restarting it is the first step.
What should I do if I get this CKA question wrong?
Identify which CKA 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.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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