- A
Run 'kubeadm upgrade apply v1.29.0' again after resetting the node with 'kubeadm reset'
Resetting the node cleans up previous state and allows a fresh upgrade application.
- B
Downgrade etcd to a version compatible with Kubernetes 1.28
Why wrong: Downgrading etcd is not recommended and may cause data corruption or loss.
- C
Immediately upgrade the worker nodes to match the control plane version
Why wrong: Worker nodes should be upgraded only after the control plane is healthy and stable.
- D
Check the kubelet logs on the control plane node using 'journalctl -u kubelet'
Kubelet logs can show errors related to pod startup, configuration mismatches, or resource issues.
- E
Run 'kubeadm upgrade plan' to verify the target version
Why wrong: 'kubeadm upgrade plan' only shows available upgrade options; it does not fix a failed apiserver.
CKA Practice Question: Cluster Architecture, Installation and Configuration
This CKA practice question tests your understanding of cluster architecture, installation and 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.
A CKA candidate is troubleshooting a control plane node that was upgraded using kubeadm from v1.28 to v1.29. After the upgrade, the kube-apiserver pod fails to start. Which TWO actions should the candidate take to diagnose and resolve the issue? (Select TWO.)
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
Run 'kubeadm upgrade apply v1.29.0' again after resetting the node with 'kubeadm reset'
Option A is correct because if the kube-apiserver pod fails to start after a kubeadm upgrade, a clean re-application of the upgrade using 'kubeadm upgrade apply v1.29.0' after resetting the node with 'kubeadm reset' can resolve corrupted or mismatched configuration files, certificates, or static pod manifests. This process reinitializes the control plane components from scratch while preserving the target version, ensuring all manifests and certificates are regenerated correctly.
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.
- ✓
Run 'kubeadm upgrade apply v1.29.0' again after resetting the node with 'kubeadm reset'
Why this is correct
Resetting the node cleans up previous state and allows a fresh upgrade application.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Downgrade etcd to a version compatible with Kubernetes 1.28
Why it's wrong here
Downgrading etcd is not recommended and may cause data corruption or loss.
- ✗
Immediately upgrade the worker nodes to match the control plane version
Why it's wrong here
Worker nodes should be upgraded only after the control plane is healthy and stable.
- ✓
Check the kubelet logs on the control plane node using 'journalctl -u kubelet'
Why this is correct
Kubelet logs can show errors related to pod startup, configuration mismatches, or resource issues.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Run 'kubeadm upgrade plan' to verify the target version
Why it's wrong here
'kubeadm upgrade plan' only shows available upgrade options; it does not fix a failed apiserver.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think 'kubeadm upgrade plan' (Option E) is a diagnostic step for a failed upgrade, but it only validates the upgrade path before execution and does not troubleshoot a post-upgrade failure.
Trap categories for this question
Command / output trap
'kubeadm upgrade plan' only shows available upgrade options; it does not fix a failed apiserver.
Detailed technical explanation
How to think about this question
When kubeadm upgrades a control plane, it updates static pod manifests in /etc/kubernetes/manifests/ and regenerates certificates via the kubeadm certs renew phase. If the apiserver fails to start, common causes include certificate expiration, mismatched etcd cluster endpoints, or corrupted manifest files; resetting and reapplying the upgrade forces a clean regeneration of all these artifacts. In real-world scenarios, a failed upgrade often leaves behind stale configuration that 'kubeadm upgrade apply' cannot overwrite without a reset, making this a reliable recovery method.
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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Cluster Architecture, Installation and Configuration — study guide chapter
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FAQ
Questions learners often ask
What does this CKA question test?
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run 'kubeadm upgrade apply v1.29.0' again after resetting the node with 'kubeadm reset' — Option A is correct because if the kube-apiserver pod fails to start after a kubeadm upgrade, a clean re-application of the upgrade using 'kubeadm upgrade apply v1.29.0' after resetting the node with 'kubeadm reset' can resolve corrupted or mismatched configuration files, certificates, or static pod manifests. This process reinitializes the control plane components from scratch while preserving the target version, ensuring all manifests and certificates are regenerated correctly.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 24, 2026
This CKA 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 CKA exam.
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