KCNA Kubernetes Fundamentals Practice Question
Which of the following is a worker node component responsible for ensuring that containers are running in a pod as specified in the pod's spec?
⚠ Common exam trap
CNCF often tests the distinction between control plane components (scheduler, etcd) and worker node agents (kubelet, kube-proxy), and the trap here is confusing the kubelet's role of running containers with the kube-scheduler's role of placing pods onto nodes.
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 worker node. It receives PodSpecs (via the API server or a file) and ensures that the containers described in those PodSpecs are running and healthy. It does this by interacting with the container runtime (e.g., containerd or CRI-O) to start, stop, and monitor containers as required.
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 kube-scheduler assigns pods to nodes based on resource availability and constraints, but it does not monitor or enforce container runtime state against the pod spec. It is tempting because scheduling is a control-plane function that determines pod placement, yet the stem asks for a worker node component that ensures containers are running as specified—a task performed by the kubelet, which directly manages pod lifecycle on its node.
- ✗
kube-proxy
Why it's wrong here
kube-proxy manages network rules, not container lifecycle.
- ✓
kubelet
Why this is correct
The kubelet ensures that containers are running in a pod as specified.
- ✗
etcd
Why it's wrong here
etcd is a control plane component that stores cluster state.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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