KCNA Container Orchestration Practice Question
What is the purpose of a readiness probe in a Kubernetes pod?
⚠ Common exam trap
CNCF often tests the confusion between readiness and liveness probes, where candidates mistakenly think readiness probes restart containers (Option B) instead of controlling traffic admission.
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 determine if the container is ready to accept traffic
A readiness probe in Kubernetes determines whether a container within a pod is ready to start accepting traffic. If the probe fails, the pod is removed from the Service's endpoints, ensuring that only healthy containers receive requests. This is distinct from liveness probes, which restart containers, and startup probes, which delay other probes until initialization completes.
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 measure resource usage of the container
Why it's wrong here
Resource usage is monitored via metrics, not probes.
- ✗
To restart the container when it becomes unresponsive
Why it's wrong here
That's a liveness probe action.
- ✓
To determine if the container is ready to accept traffic
Why this is correct
Readiness probes control Service membership.
- ✗
To check if the container is still running
Why it's wrong here
That's a liveness probe.
Go deeper
Related to this question
Learn chapter
Kubernetes Overview and Core Components
Key term
ReplicaSet and Replication
A ReplicaSet ensures a specified number of identical pod instances are running at all times in Kubernetes, using replication to maintain availability and stability.
Key term
Kubernetes API Primitives
Kubernetes API Primitives are the basic building blocks that the Kubernetes API uses to represent and manage the state of a cluster, such as Pods, Services, Deployments, and Namespaces.
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Same concept, more angles
4 more ways this is tested on KCNA
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. What is the purpose of a Readiness Probe in a Kubernetes pod?
medium- A.To ensure the pod is scheduled on a specific node
- B.To restart the container if it becomes unresponsive
- ✓ C.To check if the container is ready to start accepting traffic
- D.To check if the container is running
Why C: A Readiness Probe indicates whether a pod is ready to serve traffic; if it fails, the pod is removed from Service endpoints.
Variation 2. What is the purpose of a readiness probe in a Kubernetes pod?
easy- A.To determine if the pod should be terminated
- B.To check if the pod is alive and restart it if not
- C.To measure CPU usage of the container
- ✓ D.To signal that the pod is ready to accept traffic
Why D: A readiness probe in Kubernetes determines whether a container inside a pod is ready to start accepting traffic. If the probe fails, the pod is removed from the Service's endpoints, ensuring that only healthy pods receive requests. This is distinct from liveness probes, which check if the container is alive and should be restarted.
Variation 3. What is the purpose of a readiness probe in a Kubernetes pod?
medium- A.To check if the pod has been scheduled on a node
- B.To measure the CPU and memory usage of the container
- C.To determine if the container is healthy and should be restarted
- ✓ D.To determine if the container is ready to serve traffic
Why D: A readiness probe in Kubernetes determines whether a container inside a pod is ready to start accepting traffic. If the probe fails, the pod is removed from the Service's endpoints, preventing traffic from being routed to an unready container. This is distinct from a liveness probe, which checks if the container is healthy and should be restarted.
Variation 4. What is the purpose of a readiness probe in a Kubernetes pod?
easy- A.To check if the container is alive and restart it if not
- B.To verify the container's CPU and memory usage
- C.To ensure the container can write to persistent storage
- ✓ D.To check if the container is ready to accept traffic
Why D: A readiness probe in Kubernetes determines whether a container is ready to start accepting traffic. If the probe fails, the container is removed from the Service's endpoints, ensuring no traffic is routed to an unready pod. This is distinct from a liveness probe, which checks if the container is alive and should be restarted.
JA
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.