Quick Answer
The answer is ETCDCTL_API=3. This environment variable is required because etcdctl defaults to the v2 API, but snapshot restore commands like `etcdctl snapshot restore` rely entirely on the v3 API’s data model and command structure; without setting ETCDCTL_API=3, the tool cannot interpret the snapshot file or execute the restore, resulting in an error. On the Certified Kubernetes Administrator CKA exam, this is a classic trap—candidates often forget that etcdctl must be explicitly told to use the v3 API, especially when working with etcd v3.x clusters in Kubernetes control plane recovery scenarios. The exam tests your ability to troubleshoot snapshot operations, and this environment variable is the most common missing piece. A simple memory tip: think “v3 for restore”—if you’re restoring a snapshot, you’re working with v3 data, so set the API to match.
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.
An admin attempts to restore an etcd snapshot using 'etcdctl snapshot restore' but encounters an error. Which environment variable must be set for etcdctl to work with v3 API?
ETCD_API=3
Why wrong: The correct variable is ETCDCTL_API, not ETCD_API.
ETCDCTL_API=v3
Why wrong: The value should be '3', not 'v3'.
ETCDCTL_API=3
This variable enables the v3 API.
ETCDCTL_VERSION=3
Why wrong: There is no such version variable.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ETCDCTL_API=3
Option C is correct because etcdctl uses the etcd v2 API by default, and to interact with the v3 API (which is the standard for etcd v3.x clusters), the environment variable `ETCDCTL_API=3` must be set. Without this variable, `etcdctl snapshot restore` will fail as it relies on v3-specific commands and data model.
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.
ETCD_API=3
Why it's wrong here
The correct variable is ETCDCTL_API, not ETCD_API.
ETCDCTL_API=v3
Why it's wrong here
The value should be '3', not 'v3'.
ETCDCTL_API=3
Why this is correct
This variable enables the v3 API.
Related concept
Read the scenario before looking for a memorised answer.
ETCDCTL_VERSION=3
Why it's wrong here
There is no such version variable.
Common exam traps
The trap here is that candidates often confuse the variable name (`ETCDCTL_API` vs `ETCD_API`) or the value format (`3` vs `v3`), leading them to pick a syntactically similar but incorrect option.
Detailed technical explanation
etcdctl defaults to the v2 API for backward compatibility, but etcd v3 stores data in a different backend (boltdb) and uses a gRPC-based API. The `ETCDCTL_API=3` variable switches the client to use the v3 gRPC endpoints and the v3 command set, which includes `snapshot restore`. Without it, commands like `snapshot restore` are unrecognized, and the tool will return an error like 'snapshot: command not found'.
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: ETCDCTL_API=3 — Option C is correct because etcdctl uses the etcd v2 API by default, and to interact with the v3 API (which is the standard for etcd v3.x clusters), the environment variable `ETCDCTL_API=3` must be set. Without this variable, `etcdctl snapshot restore` will fail as it relies on v3-specific commands and data model.
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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Same concept, more angles
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Variation 1. A cluster is running etcd without TLS. The admin wants to take a snapshot backup. Which command is correct?
mediumWhy B: Option B is correct because `ETCDCTL_API=3 etcdctl snapshot save` is the proper command to take a snapshot backup of an etcd cluster using the v3 API. Since the cluster is running without TLS, the command does not require additional flags like `--cacert` or `--cert`, but the default endpoint is `http://127.0.0.1:2379`, which is used implicitly. The v3 API is required because etcd v3 stores data in a different format than v2, and `snapshot save` captures the full key-value store for disaster recovery.
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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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