KCNA Container Orchestration Practice Question
Which component is responsible for running containers on a Kubernetes node?
⚠ Common exam trap
It's easy for candidates to confuse kubelet with kube-controller-manager, thinking the controller manager handles node-level container operations, but the kubelet is the only component that directly manages containers on the node.
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
✓
kubelet
The kubelet is the primary node agent that runs on each Kubernetes node. It is responsible for ensuring that containers are running in a Pod as expected, by interacting with the container runtime (e.g., containerd or CRI-O) to start, stop, and monitor containers based on PodSpecs received from the API server.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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kube-controller-manager
Why it's wrong here
The kube-controller-manager runs reconciliation loops for controllers such as ReplicaSet and Node, adjusting desired state through the API; it does not execute containers. Kubelet performs that on each node. It is tempting because it drives workload creation, but scheduling and runtime execution sit elsewhere.
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kube-proxy
Why it's wrong here
kube-proxy programs iptables or IPVS rules to implement Service virtual IPs and load balancing across pods; it never starts or supervises containers. It would be correct when diagnosing Service reachability. The component running containers on a node is the container runtime, such as containerd, invoked by the kubelet.
- ✗
kube-apiserver
Why it's wrong here
The kube-apiserver exposes the Kubernetes API and persists cluster state in etcd; it never starts container processes. Kubelet, the node agent, instructs the container runtime to launch pods. The apiserver is tempting because every kubectl command reaches it first, but it only validates and stores objects.
- ✓
kubelet
Why this is correct
The kubelet is the node agent that receives PodSpecs from the control plane and instructs the container runtime to start, stop and monitor containers. It satisfies the stem's constraint of running containers on a node, whereas the API server, scheduler and controller manager operate at cluster level.
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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.