KCNA Container Orchestration Practice Question
Which component in Kubernetes is responsible for maintaining the desired state of the cluster?
⚠ Common exam trap
CNCF often tests the distinction between the kube-controller-manager and the kubelet, where candidates mistakenly think the kubelet maintains the cluster's desired state because it manages containers on a node, but the kubelet only ensures the pod's containers are healthy on its local node, not the cluster-wide desired state.
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 component that runs controller processes, which are control loops that watch the shared state of the cluster through the API server and make changes to move the current state toward the desired state. It is responsible for ensuring that the cluster's actual state matches the desired state defined in Kubernetes objects such as Deployments, ReplicaSets, and StatefulSets.
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-scheduler
Why it's wrong here
The scheduler assigns pods to nodes.
- ✗
kube-proxy
Why it's wrong here
kube-proxy handles network proxy and load balancing.
- ✓
kube-controller-manager
Why this is correct
The controller manager runs controllers that enforce the desired state.
- ✗
kubelet
Why it's wrong here
kubelet runs on nodes and ensures containers are running in pods.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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