CV0-004 Troubleshooting Practice Question
After deploying a new application version, users get 503 errors. The application runs on Kubernetes in a private cloud. What is the most likely cause?
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
✓
Application health check failing
503 errors typically indicate that the application is not passing health checks, causing the load balancer or Kubernetes service to stop routing traffic to the affected pods. Option B is incorrect because an incorrect ingress configuration usually results in 404 errors or connection timeouts, not 503. Option C is incorrect because insufficient pod resources lead to OOM kills or CPU throttling, which may cause 503s only indirectly if health checks fail, but the more direct cause is failed health checks. Option D is incorrect because node port exhaustion is rare and would cause connection refused, not 503.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Application health check failing
Why this is correct
Health check failures cause pods to be removed from service, resulting in 503.
- ✗
Incorrect ingress configuration
Why it's wrong here
Ingress issues typically result in 404 or timeouts.
- ✗
Insufficient pod resources
Why it's wrong here
Resource exhaustion usually leads to crashes or throttling, not 503.
- ✗
Node port exhaustion
Why it's wrong here
Node port exhaustion is rare and would cause connection refused errors.
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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.