This CKA practice question tests your understanding of cluster architecture, installation and configuration. 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.
During a cluster upgrade from v1.28 to v1.29, which component should be upgraded first on the control plane node?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
kube-apiserver
Why wrong: kube-apiserver is upgraded after etcd.
kube-scheduler
Why wrong: Scheduler is upgraded after the API server.
kube-controller-manager
Why wrong: Controller manager is upgraded after the API server.
etcd
etcd should be upgraded first to ensure data store compatibility.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
etcd
During a Kubernetes cluster upgrade, the control plane components must be upgraded in a specific order to maintain cluster stability and API availability. etcd, as the cluster's backing store, should be upgraded first because all other control plane components (kube-apiserver, kube-scheduler, kube-controller-manager) depend on it for reading and writing cluster state. Upgrading etcd first ensures that the data store is compatible with the new version before the API server and other controllers are updated.
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.
kube-apiserver
Why it's wrong here
kube-apiserver is upgraded after etcd.
kube-scheduler
Why it's wrong here
Scheduler is upgraded after the API server.
kube-controller-manager
Why it's wrong here
Controller manager is upgraded after the API server.
etcd
Why this is correct
etcd should be upgraded first to ensure data store compatibility.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
CNCF often tests the misconception that the kube-apiserver should be upgraded first because it is the central component, but the correct order requires etcd to be upgraded first due to its role as the underlying data store.
Detailed technical explanation
The upgrade order is dictated by the dependency chain: etcd (data store) → kube-apiserver (API layer) → kube-controller-manager and kube-scheduler (controllers and scheduling). etcd uses the Raft consensus protocol for distributed consistency, and upgrading it first ensures that the new version's data model and API are in place before the kube-apiserver, which uses etcd v3 API, attempts to read or write. In practice, the kube-apiserver is the only component that directly communicates with etcd, so upgrading etcd first prevents the API server from encountering incompatible data formats or missing features during the upgrade.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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What to study next
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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: etcd — During a Kubernetes cluster upgrade, the control plane components must be upgraded in a specific order to maintain cluster stability and API availability. etcd, as the cluster's backing store, should be upgraded first because all other control plane components (kube-apiserver, kube-scheduler, kube-controller-manager) depend on it for reading and writing cluster state. Upgrading etcd first ensures that the data store is compatible with the new version before the API server and other controllers are updated.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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