CKAD Application Observability and Maintenance Practice Question
This CKAD practice question tests your understanding of application observability and maintenance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 are valid ways to debug a pod using ephemeral containers?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl debug -it <pod> --image=busybox -- sh
Option A is correct because `kubectl debug -it <pod> --image=busybox -- sh` creates an ephemeral container in the target pod and attaches an interactive terminal to it. This is the standard Kubernetes mechanism for debugging a running pod without modifying its original container spec, using the ephemeral container feature (alpha in v1.16, stable in v1.23).
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.
✓
kubectl debug -it <pod> --image=busybox -- sh
Why this is correct
Creates an ephemeral container with busybox for debugging.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl run debug --image=busybox -- sh
Why it's wrong here
Creates a new pod, not an ephemeral container.
✓
Adding an ephemeral container to the pod's spec under ephemeralContainers
Why this is correct
You can add ephemeral containers directly to the pod spec.
Related concept
Read the scenario before looking for a memorised answer.
✗
kubectl exec -it <pod> -- sh
Why it's wrong here
This execs into an existing container, not an ephemeral container.
✗
kubectl attach to the pod
Why it's wrong here
Attach attaches to a running container's stdin/stdout, not an ephemeral container.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `kubectl exec` (which runs a command in an existing container) with `kubectl debug` (which creates a new ephemeral container), and also mistakenly think `kubectl run` or `kubectl attach` can inject a debug container into a running pod.
Detailed technical explanation
How to think about this question
Ephemeral containers are implemented as a special type of container that shares the pod's process namespace, network, and volumes but is not part of the pod's original resource spec — they are managed via the `ephemeralContainers` subresource of the Pod API. Under the hood, `kubectl debug` uses the EphemeralContainers API (PATCH /api/v1/namespaces/{ns}/pods/{name}/ephemeralcontainers) to inject a container that can run debugging tools (e.g., busybox, netshoot) even if the original containers are distroless or crashed. A real-world scenario is debugging a pod with a distroless image (no shell) where `kubectl exec` fails; ephemeral containers allow you to attach a shell without rebuilding the image.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKAD question in full detail.
Application Observability and Maintenance — This question tests Application Observability and Maintenance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: kubectl debug -it <pod> --image=busybox -- sh — Option A is correct because `kubectl debug -it <pod> --image=busybox -- sh` creates an ephemeral container in the target pod and attaches an interactive terminal to it. This is the standard Kubernetes mechanism for debugging a running pod without modifying its original container spec, using the ephemeral container feature (alpha in v1.16, stable in v1.23).
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.
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Question Discussion
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