KCNA Kubernetes Fundamentals Practice Question
Which Kubernetes control plane component is responsible for maintaining the desired state of the cluster, such as ensuring the correct number of pods are running?
⚠ Common exam trap
CNCF often tests the distinction between the component that stores state (etcd) and the component that actively reconciles state (kube-controller-manager), leading candidates to mistakenly choose etcd because it holds the desired state data.
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
✓
kube-controller-manager
The kube-controller-manager is the control plane component that runs controller processes, including the Replication Controller, which is responsible for ensuring that the desired number of pod replicas are running at all times. It continuously watches the state of the cluster via the kube-apiserver and makes adjustments to reconcile the current state with the desired state defined in the cluster's configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
kube-controller-manager
Why this is correct
The controller manager runs controllers (e.g., replication controller) to ensure the current state matches the desired state.
- ✗
kube-apiserver
Why it's wrong here
The API server exposes the Kubernetes API and processes RESTful requests.
- ✗
kube-scheduler
Why it's wrong here
The scheduler assigns pods to nodes based on resource availability.
- ✗
etcd
Why it's wrong here
etcd is the cluster's key-value store for all cluster data.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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