- A
env: - name: key1 valueFrom: configMapKeyRef: name: app-config key: key1
Why wrong: This only sets one environment variable from the ConfigMap, but the requirement is to mount all keys. Also, the task asks for mounting as environment variables, which 'envFrom' does.
- B
volumes: - name: config-volume configMap: name: app-config volumeMounts: - name: config-volume mountPath: /etc/config
Why wrong: This mounts the ConfigMap as files in a volume, not as environment variables.
- C
env: - name: key1 valueFrom: configMapRef: name: app-config
Why wrong: The configMapRef under 'valueFrom' is invalid; it should be configMapKeyRef and requires a specific key.
- D
envFrom: - configMapRef: name: app-config
envFrom with configMapRef injects all key-value pairs from the ConfigMap as environment variables.
Quick Answer
The answer is `envFrom` with `configMapRef` because this is the Kubernetes mechanism to mount a ConfigMap as environment variables in a pod. When you create a ConfigMap using `kubectl create configmap app-config --from-literal=key1=value1`, the `envFrom` field with a `configMapRef` pointing to `app-config` will expose every key-value pair as an environment variable, so `key1` becomes an environment variable with value `value1`. On the CKAD exam, this tests your understanding of ConfigMap consumption patterns, and a common trap is confusing `envFrom` (which mounts all keys) with `env` (which mounts individual keys using `valueFrom`). Remember that `envFrom` is for bulk imports, while `env` is for selective imports. A helpful memory tip: think "From all" for `envFrom` — it pulls everything from the ConfigMap into the pod's environment at once.
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.
You create a ConfigMap named 'app-config' with the command 'kubectl create configmap app-config --from-literal=key1=value1'. Which of the following correctly mounts this ConfigMap as environment variables in a pod?
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
envFrom: - configMapRef: name: app-config
Option D is correct because `envFrom` with `configMapRef` is the Kubernetes mechanism to expose all key-value pairs from a ConfigMap as environment variables in a pod. This directly mounts the ConfigMap created with `--from-literal=key1=value1` so that `key1` becomes an environment variable with value `value1`.
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: key1 valueFrom: configMapKeyRef: name: app-config key: key1
Why it's wrong here
This only sets one environment variable from the ConfigMap, but the requirement is to mount all keys. Also, the task asks for mounting as environment variables, which 'envFrom' does.
- ✗
volumes: - name: config-volume configMap: name: app-config volumeMounts: - name: config-volume mountPath: /etc/config
Why it's wrong here
This mounts the ConfigMap as files in a volume, not as environment variables.
- ✗
env: - name: key1 valueFrom: configMapRef: name: app-config
Why it's wrong here
The configMapRef under 'valueFrom' is invalid; it should be configMapKeyRef and requires a specific key.
- ✓
envFrom: - configMapRef: name: app-config
Why this is correct
envFrom with configMapRef injects all key-value pairs from the ConfigMap as environment variables.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `envFrom` with `env` and `configMapRef` with `configMapKeyRef`, or they incorrectly think volume mounts are equivalent to environment variable injection.
Detailed technical explanation
How to think about this question
The `envFrom` field supports `configMapRef` and `secretRef` to inject all keys as environment variables, with the key name becoming the variable name. If a key name is not a valid environment variable name (e.g., contains hyphens), Kubernetes will skip it silently, which can lead to debugging challenges. This is defined in the PodSpec API under `EnvFromSource`.
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.
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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: envFrom: - configMapRef: name: app-config — Option D is correct because `envFrom` with `configMapRef` is the Kubernetes mechanism to expose all key-value pairs from a ConfigMap as environment variables in a pod. This directly mounts the ConfigMap created with `--from-literal=key1=value1` so that `key1` becomes an environment variable with value `value1`.
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.
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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.
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