KCNA Kubernetes Fundamentals Practice Question
What is the primary purpose of a liveness probe in a container?
⚠ Common exam trap
Many exam-takers confuse liveness probes with readiness probes, often selecting option C because both involve health checks, but liveness probes manage container lifecycle while readiness probes manage traffic routing.
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
✓
To check if the container is still alive; restart if not
The primary purpose of a liveness probe is to determine whether a container is still running and healthy. If the probe fails, the kubelet kills the container and restarts it according to the pod's restart policy, ensuring self-healing. This is distinct from readiness probes, which control traffic routing, and resource checks, which are handled by metrics servers or cAdvisor.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To check resource usage like CPU and memory
Why it's wrong here
Resource usage is monitored separately; probes are for health.
- ✓
To check if the container is still alive; restart if not
Why this is correct
Correct. Liveness probes restart containers that become unresponsive.
- ✗
To check if the container is ready to serve traffic
Why it's wrong here
That is the readiness probe.
- ✗
To check if the pod is scheduled on the correct node
Why it's wrong here
Scheduling is done by the scheduler, not probes.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.