This KCNA practice question tests your understanding of kubernetes fundamentals. 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.
A developer creates a pod that needs to securely access a database password stored in the cluster. Which Kubernetes resource should be used to inject the password as an environment variable?
Secret
Correct; Secrets store sensitive data like passwords.
ServiceAccount
Why wrong: Incorrect; ServiceAccounts provide identity, not secrets.
ConfigMap
Why wrong: Incorrect; ConfigMaps are for non-sensitive configuration data.
PersistentVolumeClaim
Why wrong: Incorrect; PVCs are for storage volumes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Secret
A Secret is the correct Kubernetes resource for injecting sensitive data like a database password into a Pod as an environment variable. Secrets store base64-encoded data and are designed specifically for confidential information, unlike ConfigMaps which store non-sensitive configuration. When mounted as environment variables, Secrets ensure the password is not exposed in plaintext in the Pod specification or image layers.
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.
Secret
Why this is correct
Correct; Secrets store sensitive data like passwords.
Related concept
Read the scenario before looking for a memorised answer.
ServiceAccount
Why it's wrong here
Incorrect; ServiceAccounts provide identity, not secrets.
ConfigMap
Why it's wrong here
Incorrect; ConfigMaps are for non-sensitive configuration data.
PersistentVolumeClaim
Why it's wrong here
Incorrect; PVCs are for storage volumes.
Common exam traps
CNCF often tests the distinction between ConfigMaps and Secrets, trapping candidates who assume ConfigMaps can handle sensitive data because both resources can inject environment variables, but Secrets are the only secure choice for passwords.
Detailed technical explanation
Under the hood, Kubernetes Secrets are stored in etcd and can be encrypted at rest using a KMS provider or a local encryption key. When a Secret is referenced as an environment variable in a Pod spec, the kubelet retrieves the Secret from the API server and injects it into the container's environment at runtime, ensuring the data is never written to disk unless explicitly mounted as a volume. A real-world scenario is using a Secret to inject a database password into an application container, where the Secret is referenced by name in the Pod's envFrom or valueFrom field, and the application reads the environment variable at startup.
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 KCNA 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
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Secret — A Secret is the correct Kubernetes resource for injecting sensitive data like a database password into a Pod as an environment variable. Secrets store base64-encoded data and are designed specifically for confidential information, unlike ConfigMaps which store non-sensitive configuration. When mounted as environment variables, Secrets ensure the password is not exposed in plaintext in the Pod specification or image layers.
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 KCNA 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 KCNA exam.
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