- A
Use etcdctl to encrypt the data directory
Why wrong: etcdctl does not encrypt data at rest.
- B
Create an EncryptionConfiguration resource with aescbc, restart API server with --encryption-provider-config
This is the correct procedure for enabling encryption at rest.
- C
Set --encryption-provider=secretbox on etcd
Why wrong: etcd does not support encryption at rest directly; it is handled by the API server.
- D
Set ETCD_ENABLE_ENCRYPTION=true environment variable
Why wrong: This is not a valid environment variable.
Question 660 of 997
How to Enable etcd Encryption at Rest in Kubernetes
This CKS practice question tests your understanding of cluster setup and hardening. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A security scan reports that the etcd data directory is not encrypted at rest. The cluster uses etcd v3.5. Which steps are required to enable encryption?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an EncryptionConfiguration resource with aescbc, restart API server with --encryption-provider-config
Option B is correct because etcd data encryption at rest in Kubernetes is implemented via an EncryptionConfiguration resource that specifies a provider (e.g., aescbc) and a key. The kube-apiserver must be restarted with the --encryption-provider-config flag pointing to that configuration file, which instructs the API server to encrypt resources before writing them to etcd. This is the only supported method for enabling encryption at rest in Kubernetes clusters using etcd v3.5.
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.
- ✗
Use etcdctl to encrypt the data directory
Why it's wrong here
etcdctl does not encrypt data at rest.
- ✓
Create an EncryptionConfiguration resource with aescbc, restart API server with --encryption-provider-config
Why this is correct
This is the correct procedure for enabling encryption at rest.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set --encryption-provider=secretbox on etcd
Why it's wrong here
etcd does not support encryption at rest directly; it is handled by the API server.
- ✗
Set ETCD_ENABLE_ENCRYPTION=true environment variable
Why it's wrong here
This is not a valid environment variable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume encryption at rest is configured directly on etcd (via flags or environment variables), when in fact it is a kube-apiserver-level feature that uses an EncryptionConfiguration resource and the --encryption-provider-config flag.
Detailed technical explanation
How to think about this question
The EncryptionConfiguration resource supports multiple providers (aescbc, secretbox, identity, etc.), with aescbc being the recommended choice for production as it uses AES-CBC with PKCS#7 padding and a 32-byte key. The kube-apiserver encrypts data at the resource level before writing to etcd, meaning that even if etcd is compromised, the data remains encrypted. A subtle behavior is that the identity provider (no encryption) is the default, and changing the provider requires a key rotation procedure to avoid data loss.
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 CKS 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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Cluster Setup and Hardening — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this CKS question test?
Cluster Setup and Hardening — This question tests Cluster Setup and Hardening — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an EncryptionConfiguration resource with aescbc, restart API server with --encryption-provider-config — Option B is correct because etcd data encryption at rest in Kubernetes is implemented via an EncryptionConfiguration resource that specifies a provider (e.g., aescbc) and a key. The kube-apiserver must be restarted with the --encryption-provider-config flag pointing to that configuration file, which instructs the API server to encrypt resources before writing them to etcd. This is the only supported method for enabling encryption at rest in Kubernetes clusters using etcd v3.5.
What should I do if I get this CKS 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
4 more ways this is tested on CKS
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You need to encrypt etcd data at rest using AES-CBC. Which encryption provider should you specify in the EncryptionConfiguration?
medium- A.aesgcm
- ✓ B.aescbc
- C.aes-256-cbc
- D.secretbox
Why B: Option B (aescbc) is correct because Kubernetes supports AES-CBC encryption via the 'aescbc' provider in the EncryptionConfiguration. This provider uses AES in Cipher Block Chaining mode with a 32-byte key for encryption at rest, as specified in the Kubernetes documentation for encrypting etcd data.
Variation 2. You have enabled etcd encryption at rest using an EncryptionConfiguration with aescbc provider. After applying the configuration, you create a new Secret. Which of the following is true regarding the encrypted Secret?
hard- A.All Secrets are encrypted because the EncryptionConfiguration applies to all resources.
- B.All Secrets in the cluster, including existing ones, are immediately encrypted.
- ✓ C.Only the new Secret is encrypted; existing Secrets remain in plaintext.
- D.The new Secret is stored in plaintext because aescbc is not a valid provider.
Why C: When you apply an EncryptionConfiguration with aescbc provider, only newly created Secrets are encrypted at rest. Existing Secrets remain in plaintext because encryption is applied at write time; the API server does not retroactively re-encrypt data already stored in etcd. This is why option C is correct.
Variation 3. Which THREE of the following are valid fields in an EncryptionConfiguration YAML to encrypt secrets at rest?
medium- A.providers
- ✓ B.resources
- ✓ C.apiVersion
- D.key
- ✓ E.kind
Why B: Option B is correct because `resources` is a valid field in an EncryptionConfiguration YAML that specifies which Kubernetes resources (e.g., secrets) should be encrypted. The EncryptionConfiguration object defines how to encrypt data at rest in etcd, and the `resources` field lists the resource types to encrypt, such as `secrets`. Without this field, the encryption configuration would not know which resources to apply encryption to.
Variation 4. You have a requirement to encrypt secrets at rest in etcd. Which resource and apiVersion should be used?
medium- A.EtcdEncryption with apiVersion apiserver.config.k8s.io/v1beta1
- B.EncryptionConfig with apiVersion v1
- C.SecretEncryption with apiVersion v1
- ✓ D.EncryptionConfiguration with apiVersion apiserver.config.k8s.io/v1
Why D: Option D is correct because the Kubernetes API server uses an `EncryptionConfiguration` resource with `apiVersion apiserver.config.k8s.io/v1` to define how secrets and other resources are encrypted at rest in etcd. This resource specifies providers (e.g., `aescbc`, `secretbox`) and keys, and is loaded via the `--encryption-provider-config` flag on the API server. The `v1` version is the stable, production-ready API version for this configuration.
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Last reviewed: Jun 24, 2026
This CKS 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 CKS exam.
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