KCNA Kubernetes Fundamentals Practice Question
Which component runs on every worker node and is responsible for ensuring that containers are running in a pod as specified in the PodSpec?
⚠ Common exam trap
A common mix-up: candidates confuse the kubelet with the container runtime, assuming the runtime itself reads PodSpecs, when in fact the kubelet is the orchestrator that translates PodSpecs into runtime actions via the CRI.
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 described in a PodSpec are running and healthy, by interacting with the container runtime (e.g., containerd, CRI-O) to create, start, and monitor pods. The kubelet does not manage containers that were not created by Kubernetes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
container runtime
Why it's wrong here
The container runtime (e.g., containerd) actually runs the containers, but it is the kubelet that instructs it and ensures the desired state.
- ✗
kube-proxy
Why it's wrong here
kube-proxy maintains network rules on nodes, but does not manage container lifecycle.
- ✓
kubelet
Why this is correct
The kubelet is the primary node agent that runs on every worker node, directly satisfying the stem’s constraint of ensuring containers run per the PodSpec. It achieves this by continuously polling the API server for assigned Pods, then using the container runtime (e.g., containerd) to create, start, and restart containers based on the PodSpec’s declared state, thereby enforcing the desired container lifecycle.
- ✗
kube-scheduler
Why it's wrong here
The scheduler runs on the control plane, not on worker nodes, and decides which node a pod should run on.
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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.