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CV0-004 Practice Question: A company runs a containerized application on a…
A company runs a containerized application on a Kubernetes cluster. The application logs indicate occasional 'CrashLoopBackOff' errors. The developer says the application works fine locally. What is the most likely cause in the cloud environment?
⚠ Common exam trap
CompTIA often tests the distinction between pod statuses: candidates confuse 'CrashLoopBackOff' (container crashes after starting) with 'ImagePullBackOff' (image pull failure) or 'Pending' (resource unavailability), so they incorrectly attribute the error to image or volume issues rather than resource limits.
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 memory limit set in the pod spec is too low, causing the container to be OOMKilled.
The 'CrashLoopBackOff' error indicates that the container is repeatedly crashing after startup. Since the application works locally, the issue is likely environmental. A memory limit set too low in the pod spec causes the container to exceed its allowed memory, triggering an OOMKill (Out of Memory Kill) by the kubelet. The container restarts, fails again, and enters CrashLoopBackOff, which is a common cloud-specific resource constraint not present in local development.
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 readiness probe is misconfigured and returning false.
Why it's wrong here
Readiness probe does not cause container restart.
- ✓
The memory limit set in the pod spec is too low, causing the container to be OOMKilled.
Why this is correct
OOMKill causes container to restart, resulting in CrashLoopBackOff.
- ✗
The container image is not being pulled correctly from the registry.
Why it's wrong here
Would prevent container from starting.
- ✗
The persistent volume claim is not bound to a storage class.
Why it's wrong here
Would cause application errors, not crash loop.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.