- A
env: - name: DB_PORT valueFrom: configMapKeyRef: name: env-config key: DB_PORT envFrom: - configMapRef: name: env-config
Why wrong: This sets DB_PORT individually, but then envFrom loads all keys including DB_PORT, which would overwrite? Actually, envFrom does not override env if the key already exists? The documentation says envFrom keys are not added if the key already exists in env. So DB_PORT would keep its value. But this does not set DATABASE_HOST.
- B
env: - name: DATABASE_HOST valueFrom: configMapKeyRef: name: env-config key: DB_HOST envFrom: - configMapRef: name: env-config
This sets DATABASE_HOST from the ConfigMap key DB_HOST, and then loads all keys (DB_HOST and DB_PORT) as env vars, but note that envFrom might overwrite DATABASE_HOST if the key DB_HOST is also loaded. Actually, the order: env is processed first, then envFrom. So DATABASE_HOST will be set, then envFrom will set DB_HOST as an env var, but since DATABASE_HOST is already set, it remains. However, there would be both DATABASE_HOST and DB_HOST env vars. That's acceptable.
- C
envFrom: - configMapRef: name: env-config env: - name: DATABASE_HOST value: DB_HOST
Why wrong: The value of DATABASE_HOST would be the literal string 'DB_HOST', not the value from the ConfigMap.
- D
envFrom: - configMapRef: name: env-config prefix: DATABASE_
Why wrong: This would prefix all keys, resulting in DATABASE_DB_HOST and DATABASE_DB_PORT, not DATABASE_HOST.
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 ConfigMap named 'env-config' has keys 'DB_HOST' and 'DB_PORT'. A pod needs to set the environment variable 'DATABASE_HOST' to the value of 'DB_HOST' from the ConfigMap, and 'DB_PORT' directly as 'DB_PORT'. Which YAML snippet correctly achieves this?
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: DATABASE_HOST valueFrom: configMapKeyRef: name: env-config key: DB_HOST envFrom: - configMapRef: name: env-config
Option B is correct: for 'DATABASE_HOST', it uses valueFrom with configMapKeyRef mapping key 'DB_HOST' to the env var. For 'DB_PORT', it uses envFrom with configMapRef to load all keys. Option A uses envFrom for both, but that would not rename 'DB_HOST'. Option C uses envFrom for DATABASE_HOST, which won't rename. Option D uses env with configMapKeyRef for DB_PORT, but then envFrom overrides it? Actually, order matters: envFrom is processed after env, so env would be overwritten. But the correct approach is to use env for the renamed variable and envFrom for the rest.
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_PORT valueFrom: configMapKeyRef: name: env-config key: DB_PORT envFrom: - configMapRef: name: env-config
Why it's wrong here
This sets DB_PORT individually, but then envFrom loads all keys including DB_PORT, which would overwrite? Actually, envFrom does not override env if the key already exists? The documentation says envFrom keys are not added if the key already exists in env. So DB_PORT would keep its value. But this does not set DATABASE_HOST.
- ✓
env: - name: DATABASE_HOST valueFrom: configMapKeyRef: name: env-config key: DB_HOST envFrom: - configMapRef: name: env-config
Why this is correct
This sets DATABASE_HOST from the ConfigMap key DB_HOST, and then loads all keys (DB_HOST and DB_PORT) as env vars, but note that envFrom might overwrite DATABASE_HOST if the key DB_HOST is also loaded. Actually, the order: env is processed first, then envFrom. So DATABASE_HOST will be set, then envFrom will set DB_HOST as an env var, but since DATABASE_HOST is already set, it remains. However, there would be both DATABASE_HOST and DB_HOST env vars. That's acceptable.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
envFrom: - configMapRef: name: env-config env: - name: DATABASE_HOST value: DB_HOST
Why it's wrong here
The value of DATABASE_HOST would be the literal string 'DB_HOST', not the value from the ConfigMap.
- ✗
envFrom: - configMapRef: name: env-config prefix: DATABASE_
Why it's wrong here
This would prefix all keys, resulting in DATABASE_DB_HOST and DATABASE_DB_PORT, not DATABASE_HOST.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 CKAD 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 CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Application Environment, Configuration and Security — study guide chapter
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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: DATABASE_HOST valueFrom: configMapKeyRef: name: env-config key: DB_HOST envFrom: - configMapRef: name: env-config — Option B is correct: for 'DATABASE_HOST', it uses valueFrom with configMapKeyRef mapping key 'DB_HOST' to the env var. For 'DB_PORT', it uses envFrom with configMapRef to load all keys. Option A uses envFrom for both, but that would not rename 'DB_HOST'. Option C uses envFrom for DATABASE_HOST, which won't rename. Option D uses env with configMapKeyRef for DB_PORT, but then envFrom overrides it? Actually, order matters: envFrom is processed after env, so env would be overwritten. But the correct approach is to use env for the renamed variable and envFrom for the rest.
What should I do if I get this CKAD question wrong?
Identify which CKAD exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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 21, 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.
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