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.
Which THREE are valid methods to restore an etcd cluster from a snapshot? (Select 3)
Restore snapshot on a new node and add it as a member, then remove old
Common procedure.
kubeadm reset and re-init
Why wrong: Loses state.
etcdctl snapshot restore snapshot.db --data-dir=/var/lib/etcd-restore
Direct restore.
Stop etcd, replace data directory with restored snapshot, start etcd
Manual method.
kubectl apply -f snapshot.yaml
Why wrong: Invalid.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Restore snapshot on a new node and add it as a member, then remove old
Option A is correct because it describes the standard procedure for replacing a failed etcd member using a snapshot: you restore the snapshot on a new node (using `etcdctl snapshot restore`), start the new etcd instance, add it as a member to the existing cluster, and then remove the old, failed member. This ensures the new node joins with the correct data and the cluster quorum is maintained.
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.
Restore snapshot on a new node and add it as a member, then remove old
Why this is correct
Common procedure.
Related concept
Read the scenario before looking for a memorised answer.
kubeadm reset and re-init
Why it's wrong here
Loses state.
etcdctl snapshot restore snapshot.db --data-dir=/var/lib/etcd-restore
Why this is correct
Direct restore.
Related concept
Read the scenario before looking for a memorised answer.
Stop etcd, replace data directory with restored snapshot, start etcd
Why this is correct
Manual method.
Related concept
Read the scenario before looking for a memorised answer.
kubectl apply -f snapshot.yaml
Why it's wrong here
Invalid.
Common exam traps
The trap here is that candidates often think `kubeadm reset` followed by `kubeadm init` can restore an etcd snapshot, but this actually creates a brand-new cluster with no prior data, while the correct method involves restoring the snapshot into a separate directory and then adding the node as a new member.
Detailed technical explanation
When restoring an etcd cluster from a snapshot, the `etcdctl snapshot restore` command rewrites the snapshot into a new data directory with a fresh cluster ID and member ID to avoid conflicts with the existing cluster. The restored member must then be added via the `etcdctl member add` API, which updates the cluster's member list and triggers the Raft consensus protocol to integrate the new node. In a real-world scenario, if you restore directly into the existing data directory without changing the cluster metadata, the member will fail to join because its cluster ID will conflict with the running cluster.
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
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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: Restore snapshot on a new node and add it as a member, then remove old — Option A is correct because it describes the standard procedure for replacing a failed etcd member using a snapshot: you restore the snapshot on a new node (using `etcdctl snapshot restore`), start the new etcd instance, add it as a member to the existing cluster, and then remove the old, failed member. This ensures the new node joins with the correct data and the cluster quorum is maintained.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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