KCNA Kubernetes Fundamentals Practice Question
Which component runs on every Kubernetes node and ensures that the containers in a pod are running?
⚠ Common exam trap
Watch out — candidates often confuse the container runtime (which physically runs containers) with the kubelet (which orchestrates and monitors them), leading them to select '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 Kubernetes node. It receives PodSpec definitions from the API server and ensures that the containers described in those PodSpecs are running and healthy. It continuously monitors container status and takes corrective actions, such as restarting containers that have failed, making it the correct answer.
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-proxy
Why it's wrong here
kube-proxy maintains network rules for service load balancing on each node, so it handles traffic routing rather than pod lifecycle. It is the right answer when the question asks how Service virtual IPs and iptables or IPVS rules are implemented, not how containers are kept running.
- ✗
kube-scheduler
Why it's wrong here
kube-scheduler selects a node for each newly created pod but then stops; it never runs on every node nor keeps containers running. It is correct when the question concerns placement decisions and resource-fit scoring, not continuous reconciliation of pod state on a node.
- ✓
kubelet
Why this is correct
The kubelet is the node agent that watches the API server for pod assignments and directly manages container lifecycles via the container runtime, restarting failed containers to maintain the desired state. This satisfies the stem's requirement for a per-node component guaranteeing that a pod's containers keep running.
- ✗
container runtime
Why it's wrong here
The container runtime actually starts and supervises containers on a node, but it does not watch pod specs and reconcile them; kubelet does that. Container runtime is the correct answer when the question asks what executes container images, not what ensures the declared pod state is maintained.
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JA
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.