KCNA Kubernetes Fundamentals Practice Question
Which component runs on every node and is responsible for ensuring that containers are running as specified in Pod manifests?
⚠ Common exam trap
Many candidates confuse the container runtime (which actually runs containers) with the kubelet (which ensures the desired state from Pod manifests), leading them to pick 'container runtime' instead of 'kubelet'.
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 node in a Kubernetes cluster. It is responsible for ensuring that containers described in Pod manifests (typically provided via the API server) are running and healthy. The kubelet does not manage containers directly; instead, it interacts with the container runtime (e.g., containerd, CRI-O) to create, start, and stop containers as specified.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
kubelet
Why this is correct
kubelet is the agent that runs on each node and manages Pods and their containers.
- ✗
kube-proxy
Why it's wrong here
kube-proxy maintains network rules on nodes, not container lifecycle.
- ✗
container runtime
Why it's wrong here
The container runtime (e.g., containerd) runs containers, but it is the kubelet that instructs it based on Pod specs.
- ✗
kube-controller-manager
Why it's wrong here
The controller manager runs controllers that regulate the cluster, but it is not a node-level component.
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