This CKAD practice question tests your understanding of application environment, configuration and security. 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.
Which TWO of the following are valid sources for creating a ConfigMap?
A file
Using --from-file.
An environment variable file
Why wrong: This is a specific format of from-file, but the source is still a file.
Literal key-value pairs
Using --from-literal.
A directory
Why wrong: You cannot directly create a ConfigMap from a directory; you must use --from-file with a file.
A Secret
Why wrong: Secrets are separate resources; ConfigMaps cannot be created from Secrets.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
A file
A file is a valid source for creating a ConfigMap because the `kubectl create configmap` command supports the `--from-file` flag, which reads the entire contents of a file and creates a key-value pair where the key defaults to the filename. This is commonly used to inject configuration data like application properties or scripts into a Pod.
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.
A file
Why this is correct
Using --from-file.
Related concept
Read the scenario before looking for a memorised answer.
An environment variable file
Why it's wrong here
This is a specific format of from-file, but the source is still a file.
Literal key-value pairs
Why this is correct
Using --from-literal.
Related concept
Read the scenario before looking for a memorised answer.
A directory
Why it's wrong here
You cannot directly create a ConfigMap from a directory; you must use --from-file with a file.
A Secret
Why it's wrong here
Secrets are separate resources; ConfigMaps cannot be created from Secrets.
Common exam traps
CNCF often tests the distinction between valid sources (`--from-file`, `--from-literal`) and invalid ones like a directory or Secret, tricking candidates into thinking a directory or Secret can be directly used as a source for `kubectl create configmap`.
Detailed technical explanation
Under the hood, `kubectl create configmap` with `--from-file` reads the file's raw bytes and stores them as a string value in the ConfigMap's `data` field, with the filename as the key. For binary files, use `--from-file` with a custom key to avoid issues, as ConfigMap values must be UTF-8 strings. A real-world scenario is injecting an nginx.conf file into a Pod; using `--from-file=nginx.conf` creates a ConfigMap entry that can be mounted as a volume, allowing dynamic configuration without rebuilding the image.
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 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
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FAQ
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
The correct answer is: A file — A file is a valid source for creating a ConfigMap because the `kubectl create configmap` command supports the `--from-file` flag, which reads the entire contents of a file and creates a key-value pair where the key defaults to the filename. This is commonly used to inject configuration data like application properties or scripts into a Pod.
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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Last reviewed: Jun 30, 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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