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.
You need to restore an etcd snapshot taken with 'etcdctl snapshot save'. You have a single control plane node. Which sequence of commands is correct?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Stop the API server, run 'etcdctl snapshot restore /backup/snapshot.db --data-dir /var/lib/etcd-restored', then start etcd with the restored data
Option B is correct because restoring an etcd snapshot requires stopping the API server first to prevent data corruption, then using 'etcdctl snapshot restore' to create a new data directory, and finally starting etcd with the restored data. The API server depends on etcd, so it must be stopped before the restore, and the restored data directory must be specified to avoid overwriting the existing etcd data.
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 'etcdctl import /backup/snapshot.db' and restart the API server
Why it's wrong here
'import' is not a valid subcommand for etcdctl snapshot restoration.
✓
Stop the API server, run 'etcdctl snapshot restore /backup/snapshot.db --data-dir /var/lib/etcd-restored', then start etcd with the restored data
Why this is correct
This is the standard restore process.
Related concept
Read the scenario before looking for a memorised answer.
✗
Stop the API server, run 'etcdctl restore /backup/snapshot.db', then restart etcd
Why it's wrong here
'etcdctl restore' is not a valid subcommand; must use 'snapshot restore'.
✗
Run 'etcdctl snapshot restore /backup/snapshot.db' while etcd is running, then restart etcd
Why it's wrong here
Restoring while etcd is running can cause conflicts; etcd must be stopped.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the 'snapshot restore' command with a generic 'restore' command, or assume the API server can remain running during the restore, leading to corruption or invalid command choices.
Trap categories for this question
Command / output trap
'import' is not a valid subcommand for etcdctl snapshot restoration.
Detailed technical explanation
How to think about this question
The 'etcdctl snapshot restore' command creates a new etcd data directory from the snapshot, which includes cluster metadata like member ID and cluster ID. In a single-node control plane, after restore, you must update the etcd systemd unit file or start etcd with the '--data-dir' flag pointing to the restored directory, and ensure the API server is restarted to connect to the restored etcd. A subtle behavior is that the restored snapshot does not preserve the original member's peer URLs, so you may need to manually adjust etcd configuration or use '--initial-cluster' and '--initial-cluster-token' flags to avoid conflicts.
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: Stop the API server, run 'etcdctl snapshot restore /backup/snapshot.db --data-dir /var/lib/etcd-restored', then start etcd with the restored data — Option B is correct because restoring an etcd snapshot requires stopping the API server first to prevent data corruption, then using 'etcdctl snapshot restore' to create a new data directory, and finally starting etcd with the restored data. The API server depends on etcd, so it must be stopped before the restore, and the restored data directory must be specified to avoid overwriting the existing etcd data.
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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