- A
env: - name: DB_PASSWORD valueFrom: secretKeyRef: name: db-secret key: password
This correctly references the secret key 'password' from the Secret named 'db-secret'.
- B
volumes: - name: secret-vol secret: secretName: db-secret containers: - volumeMounts: - name: secret-vol mountPath: /etc/secret
Why wrong: This mounts the Secret as files, not environment variables.
- C
envFrom: - secretRef: name: db-secret
Why wrong: This would expose all keys as environment variables, but the key name would be 'password', not 'DB_PASSWORD'. It does not allow renaming.
- D
env: - name: DB_PASSWORD valueFrom: configMapKeyRef: name: db-secret key: password
Why wrong: configMapKeyRef is for ConfigMaps, not Secrets. Use secretKeyRef.
Quick Answer
The correct way to expose a Secret as an environment variable in a Pod is to use `valueFrom` with `secretKeyRef` inside the `env` block, as shown in the correct answer. This approach directly references the specific key `password` from the `db-secret` Secret, allowing Kubernetes to inject its value into the container as the `DB_PASSWORD` environment variable at runtime. On the CKAD exam, this tests your understanding of how to securely consume sensitive data without hardcoding it, a frequent topic in Pod specification questions. A common trap is confusing `secretKeyRef` with `configMapKeyRef` or trying to mount the entire Secret as a volume when only a single key is needed. Remember the mnemonic: "Env from Secret, key by key" — always pair `valueFrom` with `secretKeyRef` and specify both the Secret name and the exact key to extract.
CKAD Practice Question: Application Environment, Configuration and Security
This CKAD practice question tests your understanding of application environment, configuration and security. 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.
A developer creates a Secret using the command: 'kubectl create secret generic db-secret --from-literal=password=myPass'. Which way to consume this Secret in a pod is CORRECT?
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
env: - name: DB_PASSWORD valueFrom: secretKeyRef: name: db-secret key: password
Option A is correct because `secretKeyRef` under `valueFrom` in an `env` entry is the proper way to inject a single key from a Kubernetes Secret into a container environment variable. The Secret was created with key `password` and value `myPass`, so `secretKeyRef` with `name: db-secret` and `key: password` correctly references that key.
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.
- ✓
env: - name: DB_PASSWORD valueFrom: secretKeyRef: name: db-secret key: password
Why this is correct
This correctly references the secret key 'password' from the Secret named 'db-secret'.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
volumes: - name: secret-vol secret: secretName: db-secret containers: - volumeMounts: - name: secret-vol mountPath: /etc/secret
Why it's wrong here
This mounts the Secret as files, not environment variables.
- ✗
envFrom: - secretRef: name: db-secret
Why it's wrong here
This would expose all keys as environment variables, but the key name would be 'password', not 'DB_PASSWORD'. It does not allow renaming.
- ✗
env: - name: DB_PASSWORD valueFrom: configMapKeyRef: name: db-secret key: password
Why it's wrong here
configMapKeyRef is for ConfigMaps, not Secrets. Use secretKeyRef.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `configMapKeyRef` with `secretKeyRef` or assume that `envFrom` is the only way to consume Secrets, but the exam tests the precise syntax for referencing a single key from a Secret into a specific environment variable.
Detailed technical explanation
How to think about this question
Under the hood, `secretKeyRef` uses the Kubernetes API to fetch the base64-decoded value of the specified key from the Secret object and injects it as an environment variable. Secrets are stored in etcd and, by default, are base64-encoded but not encrypted at rest unless encryption at rest is configured. In real-world scenarios, using `envFrom` with `secretRef` can be convenient for injecting multiple keys, but it may expose unintended secrets if the Secret contains extra keys, and it does not allow renaming keys, which `valueFrom` with `secretKeyRef` does by setting a custom `name` for the environment variable.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
- →
Application Environment, Configuration and Security — study guide chapter
Learn the concepts, then practise the questions
- →
Application Environment, Configuration and Security practice questions
Targeted practice on this topic area only
- →
All CKAD questions
991 questions across all exam domains
- →
Certified Kubernetes Application Developer CKAD study guide
Full concept coverage aligned to exam objectives
- →
CKAD practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related CKAD practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Application Design and Build practice questions
Practise CKAD questions linked to Application Design and Build.
Application Deployment practice questions
Practise CKAD questions linked to Application Deployment.
Application Environment, Configuration and Security practice questions
Practise CKAD questions linked to Application Environment, Configuration and Security.
Application Observability and Maintenance practice questions
Practise CKAD questions linked to Application Observability and Maintenance.
Services and Networking practice questions
Practise CKAD questions linked to Services and Networking.
CKAD fundamentals practice questions
Practise CKAD questions linked to CKAD fundamentals.
CKAD scenario practice questions
Practise CKAD questions linked to CKAD scenario.
CKAD troubleshooting practice questions
Practise CKAD questions linked to CKAD troubleshooting.
Practice this exam
Start a free CKAD practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this CKAD question test?
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: env: - name: DB_PASSWORD valueFrom: secretKeyRef: name: db-secret key: password — Option A is correct because `secretKeyRef` under `valueFrom` in an `env` entry is the proper way to inject a single key from a Kubernetes Secret into a container environment variable. The Secret was created with key `password` and value `myPass`, so `secretKeyRef` with `name: db-secret` and `key: password` correctly references that key.
What should I do if I get this CKAD 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 →
Last reviewed: Jun 25, 2026
This CKAD 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 CKAD exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.