- A
The Secret data is base64 encoded in the manifest, but the application expects decoded values
Why wrong: Kubernetes decodes the value before presenting it to the container, so this is not an issue.
- B
The ConfigMap does not exist in the namespace
If the ConfigMap is missing, the pod may fail to mount or the environment variable will be undefined.
- C
The Secret volume mount has files with incorrect permissions (e.g., 0400) and the application runs as a non-root user
Secrets are mounted with default permissions 0400, which may prevent reading if the application user lacks access.
- D
The ServiceAccount used by the pod does not have permissions to access Secrets
Why wrong: This would cause a Forbidden error, not a missing key error.
- E
The ConfigMap was updated but the pod was not restarted
Why wrong: This would cause stale data, not a missing key error.
CKAD Application Deployment Practice Question
This CKAD practice question tests your understanding of application deployment. 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.
You are deploying a microservice that reads from a ConfigMap and a Secret. The application logs show 'Failed to read configuration: missing key' on startup. Which TWO are likely causes?
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
The ConfigMap does not exist in the namespace
Option B is correct because if the ConfigMap does not exist in the namespace, any pod referencing it will fail to start or the application will be unable to read the configuration data. Kubernetes validates ConfigMap existence at pod creation time, and missing ConfigMaps cause the pod to remain in a pending state or the application to log errors like 'missing key' when attempting to access the configuration.
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.
- ✗
The Secret data is base64 encoded in the manifest, but the application expects decoded values
Why it's wrong here
Kubernetes decodes the value before presenting it to the container, so this is not an issue.
- ✓
The ConfigMap does not exist in the namespace
Why this is correct
If the ConfigMap is missing, the pod may fail to mount or the environment variable will be undefined.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The Secret volume mount has files with incorrect permissions (e.g., 0400) and the application runs as a non-root user
Why this is correct
Secrets are mounted with default permissions 0400, which may prevent reading if the application user lacks access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The ServiceAccount used by the pod does not have permissions to access Secrets
Why it's wrong here
This would cause a Forbidden error, not a missing key error.
- ✗
The ConfigMap was updated but the pod was not restarted
Why it's wrong here
This would cause stale data, not a missing key error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CNCF often tests the misconception that RBAC permissions are required for reading Secrets mounted as volumes, when in fact any pod with a volume mount can read the Secret data directly from the filesystem without API-level authorization.
Detailed technical explanation
How to think about this question
When a ConfigMap or Secret is mounted as a volume, Kubernetes creates a tmpfs or symlink-based filesystem that reflects the current data at mount time; updates to the ConfigMap propagate to the pod's filesystem via a projected volume with a refresh interval (typically 60 seconds for kubelet sync), but environment variable injections are static and only set at pod startup. The 'missing key' error often occurs when the application expects a specific key that is absent from the ConfigMap or Secret, or when the resource itself does not exist, causing the volume mount to fail silently or the environment variable to be empty.
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 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
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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FAQ
Questions learners often ask
What does this CKAD question test?
Application Deployment — This question tests Application Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ConfigMap does not exist in the namespace — Option B is correct because if the ConfigMap does not exist in the namespace, any pod referencing it will fail to start or the application will be unable to read the configuration data. Kubernetes validates ConfigMap existence at pod creation time, and missing ConfigMaps cause the pod to remain in a pending state or the application to log errors like 'missing key' when attempting to access the configuration.
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.
About these practice questions
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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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