CKA Practice Question: Cluster Architecture, Installation and Configuration
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 TWO of the following are valid methods to restore an etcd cluster from a snapshot? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Stopping all etcd members, copying the snapshot to the data directory, and starting etcd
Option C is correct because restoring an etcd cluster from a snapshot can be done by stopping all etcd members, copying the snapshot file to the etcd data directory (typically `/var/lib/etcd`), and then restarting the etcd service. This manual method works when you replace the entire data directory with the snapshot content, allowing etcd to rebuild its state from the snapshot on startup.
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.
✗
etcdctl restore
Why it's wrong here
This is not a valid command; the correct subcommand is 'snapshot restore'.
✗
kubectl apply -f etcd-backup.yaml
Why it's wrong here
There is no such resource; etcd backup is not managed via kubectl.
✓
Stopping all etcd members, copying the snapshot to the data directory, and starting etcd
Why this is correct
If you replace the data directory with the snapshot, etcd will use it on startup.
Related concept
Read the scenario before looking for a memorised answer.
✓
etcdctl snapshot restore
Why this is correct
This command restores the snapshot to a new data directory.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubeadm reset
Why it's wrong here
kubeadm reset resets the node but does not restore etcd from a snapshot.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the distinction between `etcdctl restore` (invalid) and `etcdctl snapshot restore` (valid), and the trap here is that candidates may confuse the deprecated `etcdctl restore` command with the correct `etcdctl snapshot restore` subcommand, or think that `kubectl apply` can handle binary snapshot files.
Trap categories for this question
Command / output trap
This is not a valid command; the correct subcommand is 'snapshot restore'.
Detailed technical explanation
How to think about this question
When restoring an etcd cluster from a snapshot, the `etcdctl snapshot restore` command creates a new data directory with the snapshot's data, preserving the cluster's member ID and cluster ID to avoid conflicts. In a multi-member cluster, you must restore each member individually, ensuring the `--initial-cluster` and `--initial-advertise-peer-urls` flags match the original cluster topology. A real-world scenario is recovering from a corrupted etcd data directory where you must stop all etcd processes, restore the snapshot, and then start etcd with the `--force-new-cluster` flag if the cluster is a single member.
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 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.
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: Stopping all etcd members, copying the snapshot to the data directory, and starting etcd — Option C is correct because restoring an etcd cluster from a snapshot can be done by stopping all etcd members, copying the snapshot file to the etcd data directory (typically `/var/lib/etcd`), and then restarting the etcd service. This manual method works when you replace the entire data directory with the snapshot content, allowing etcd to rebuild its state from the snapshot on startup.
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.
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Question Discussion
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