CKAD Practice Question: Application Environment, Configuration and Security
You need to create a ConfigMap named 'app-config' from a file 'config.properties'. Which kubectl command should you use?
⚠ Common exam trap
Candidates often confuse `--from-file` (which imports the entire file as a single key) with `--from-env-file` (which parses key-value pairs from a file), leading them to choose option D when they intend to import a properties file as a whole, or option B when they think `--from-literal` can accept a file path.
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
✓
kubectl create configmap app-config --from-file=config.properties
`kubectl create configmap app-config --from-file=config.properties` reads the file `config.properties` and creates a ConfigMap named `app-config` with a data key equal to the filename (`config.properties`) and the value set to the file's contents. This is the standard way to create a ConfigMap from a single file in Kubernetes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
kubectl create configmap app-config config.properties
Why it's wrong here
Without the --from-file flag, kubectl interprets config.properties as the name of an additional ConfigMap, not as a source file. The command would attempt to create a second ConfigMap named 'config.properties' rather than reading its contents, and the straightforward syntax for file-based creation requires explicitly declaring the file source with --from-file.
- ✗
kubectl create configmap app-config --from-literal=config.properties
Why it's wrong here
--from-literal is designed to inject literal key=value pairs directly into the ConfigMap's data, so passing config.properties without an equals sign is invalid syntax; kubectl expects a key=value format. Even if formatted properly, it would store the literal string as a value, not read the file's contents, which is why this approach cannot be used for file-based configuration data.
- ✓
kubectl create configmap app-config --from-file=config.properties
Why this is correct
The --from-file flag tells kubectl to read the specified file and create a ConfigMap with the file's base name (config.properties) as the key and its entire content as the value. This is the idiomatic Kubernetes way to populate a ConfigMap from a standalone configuration file, preserving all data exactly as-is without requiring a key=value format.
- ✗
kubectl create configmap app-config --from-env-file=config.properties
Why it's wrong here
The --from-env-file flag parses the file as an environment-style file where each line must be in KEY=VALUE format, and it only imports those key/value pairs; arbitrary configuration files like properties or YAML are not processed correctly. Additionally, --from-env-file can only be specified once per command, whereas --from-file can be repeated, and using it here would either fail or import nothing meaningful if the file lacks the expected format.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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