KCNA Kubernetes Fundamentals Practice Question
You need to provide configuration data as environment variables to a pod, but the data is not sensitive. Which object should you use?
⚠ Common exam trap
Many candidates confuse ConfigMap with Secret, assuming that any data passed as environment variables must be sensitive, or they overlook that ServiceAccounts are for identity, not configuration data.
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
✓
ConfigMap
A ConfigMap is the correct Kubernetes object for providing non-sensitive configuration data as environment variables to a pod. ConfigMaps are designed to decouple configuration artifacts from image content to keep containers portable, and they support injection via environment variables, command-line arguments, or volume mounts. Unlike Secrets, ConfigMaps store data in plaintext (base64-encoded only for transport) and are intended for data that does not require encryption at rest or in transit.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ConfigMap
Why this is correct
ConfigMap stores non-sensitive configuration as key–value pairs, which Kubernetes can project into a pod as environment variables via `envFrom` or `valueFrom.configMapKeyRef`. This satisfies the stem's constraint that the data is not sensitive, unlike Secret, which is intended for credentials and base64-encodes values.
- ✗
Secret
Why it's wrong here
A Secret injects environment variables, but it is intended for sensitive values such as passwords and tokens, and the stem states the data is not sensitive. It is tempting because the mechanism matches exactly, and would be correct if the configuration contained credentials requiring protection.
- ✗
ServiceAccount
Why it's wrong here
A ServiceAccount provides an identity for pods to authenticate to the Kubernetes API, not arbitrary configuration values. It is tempting because it is mounted into pods and referenced in specs, and would be correct when a workload needs RBAC-scoped API permissions rather than configuration data.
- ✗
PersistentVolume
Why it's wrong here
A PersistentVolume supplies durable block or file storage to a pod, and cannot inject key-value pairs as environment variables. It is tempting because pods do mount volumes for data, and would be correct when the requirement is retaining files across pod restarts rather than passing configuration.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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