KCNA Container Orchestration Practice Question
A team notices that a ReplicaSet is not creating the desired number of pods. The ReplicaSet YAML is correctly configured with replicas: 3. The cluster has sufficient resources. What is the most likely cause?
⚠ Common exam trap
Many candidates assume a nodeSelector mismatch or ResourceQuota is the issue, but the question specifies 'not creating the desired number of pods' — a nodeSelector mismatch still creates the pod object, while an invalid image pull secret prevents the pod from becoming Ready, causing the ReplicaSet to appear to not create pods when in fact it creates them but they fail to run.
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 pod template references an invalid image pull secret
An invalid image pull secret in the pod template prevents the kubelet from authenticating with the container registry, causing the pod creation to fail. The ReplicaSet controller attempts to create pods, but the scheduler cannot pull the image, so the pods remain in a pending or ImagePullBackOff state, never reaching the desired count of 3.
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 ReplicaSet is paused
Why it's wrong here
ReplicaSets do not have a paused field; that feature is for Deployments.
- ✓
The pod template references an invalid image pull secret
Why this is correct
Invalid image pull secret would cause pods to fail with ImagePullBackOff, reducing the ready count.
- ✗
The nodeSelector does not match any node
Why it's wrong here
Pods would remain pending, but the ReplicaSet would still show the desired count.
- ✗
A ResourceQuota in the namespace limits the number of pods
Why it's wrong here
ResourceQuota would prevent pod creation, resulting in fewer replicas, but the ReplicaSet would show the desired count.
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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.