This CKA practice question tests your understanding of cluster architecture, installation and 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.
During a cluster upgrade using kubeadm, after upgrading kubeadm on the node, which command upgrades the kubelet configuration?
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.
kubeadm upgrade node config --kubelet-version v1.29.0
Correct command.
kubectl upgrade node kubelet
Why wrong: No such kubectl command.
kubeadm upgrade apply --kubelet-version v1.29.0
Why wrong: apply is for control plane.
systemctl restart kubelet
Why wrong: Restarts but doesn't upgrade config.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
kubeadm upgrade node config --kubelet-version v1.29.0
After upgrading kubeadm on the node, the correct command to upgrade the kubelet configuration is `kubeadm upgrade node config --kubelet-version v1.29.0`. This command updates the kubelet configuration file (typically `/var/lib/kubelet/config.yaml`) to match the target Kubernetes version, ensuring the kubelet can join the upgraded control plane. It is a specific subcommand of `kubeadm upgrade node` that handles only the kubelet configuration, not the kubelet binary itself.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
kubeadm upgrade node config --kubelet-version v1.29.0
Why this is correct
Correct command.
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.
kubectl upgrade node kubelet
Why it's wrong here
No such kubectl command.
kubeadm upgrade apply --kubelet-version v1.29.0
Why it's wrong here
apply is for control plane.
systemctl restart kubelet
Why it's wrong here
Restarts but doesn't upgrade config.
Common exam traps
The trap here is that candidates confuse `kubeadm upgrade apply` (which upgrades the control plane) with the node-specific configuration upgrade, or they assume restarting the kubelet service is sufficient to apply version-specific configuration changes.
Trap categories for this question
Command / output trap
No such kubectl command.
Detailed technical explanation
The `kubeadm upgrade node config` command reads the current kubelet configuration from the node's kubelet config file and rewrites it with version-specific defaults, such as the `authentication` and `authorization` settings required by the new API server. Under the hood, it uses the `kubeadm` internal API to generate a `KubeletConfiguration` object for the specified version, which is then serialized to YAML and written to disk. A subtle behavior is that this command does not upgrade the kubelet binary itself; that must be done separately (e.g., via package manager), and then the kubelet must be restarted to pick up the new configuration.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: kubeadm upgrade node config --kubelet-version v1.29.0 — After upgrading kubeadm on the node, the correct command to upgrade the kubelet configuration is `kubeadm upgrade node config --kubelet-version v1.29.0`. This command updates the kubelet configuration file (typically `/var/lib/kubelet/config.yaml`) to match the target Kubernetes version, ensuring the kubelet can join the upgraded control plane. It is a specific subcommand of `kubeadm upgrade node` that handles only the kubelet configuration, not the kubelet binary itself.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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.
Read the scenario before looking for a memorised answer.
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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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