KCNA Kubernetes Fundamentals Practice Question
Which component runs on every worker node and is responsible for maintaining the lifecycle of pods?
⚠ Common exam trap
A common trap on CNCF exams is confusing the kubelet (node agent for Pod lifecycle) with kube-proxy (node agent for networking), as both run on worker nodes, but kube-proxy does not manage Pods.
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 every worker node in a Kubernetes cluster. 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 Pods based on PodSpecs received from the API server. Without the kubelet, the node cannot manage Pod lifecycles.
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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container runtime
Why it's wrong here
The container runtime pulls images and starts or stops containers, but it does not manage pod lifecycle, readiness or restarts. It is the correct answer when asked what executes containers on a node, whereas kubelet owns pod lifecycle.
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kube-scheduler
Why it's wrong here
kube-scheduler runs as a control-plane component and only assigns unscheduled pods to nodes; it does not run on every worker node or maintain pod lifecycle. It is correct when the question asks how pods are placed onto nodes.
- ✓
kubelet
Why this is correct
The kubelet is the node agent that watches the API server for pods bound to its node, then starts, monitors and restarts containers via the container runtime. It therefore maintains pod lifecycle on every worker node, unlike the scheduler or control-plane components.
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kube-proxy
Why it's wrong here
kube-proxy programs iptables or IPVS rules to forward Service traffic to pod endpoints; it never creates, monitors or restarts pods. It is the correct component for Service load balancing, but kubelet handles pod lifecycle on each node.
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