This CKA practice question tests your understanding of cluster architecture, installation and configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which component is responsible for running containers on a node and reporting their status to the control plane?
kubelet
kubelet is the primary node agent that manages pods and reports node and container status.
container runtime (e.g., containerd)
Why wrong: Container runtime runs containers but does not report to API server; kubelet interfaces with it.
kube-proxy
Why wrong: kube-proxy manages network rules, not container lifecycle.
kube-scheduler
Why wrong: kube-scheduler runs on control plane, not worker nodes.
Answer choices
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 are running in a Pod as expected, by interacting with the container runtime (e.g., containerd) to start, stop, and monitor containers. The kubelet then reports the status of the node and its Pods back to the control plane via the Kubernetes API server, using heartbeats (NodeStatus updates) and Pod status updates.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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 primary node agent that manages pods and reports node and container status.
Related concept
Read the scenario before looking for a memorised answer.
container runtime (e.g., containerd)
Why it's wrong here
Container runtime runs containers but does not report to API server; kubelet interfaces with it.
kube-proxy
Why it's wrong here
kube-proxy manages network rules, not container lifecycle.
kube-scheduler
Why it's wrong here
kube-scheduler runs on control plane, not worker nodes.
Common exam traps
The trap here is that candidates often confuse the container runtime with the kubelet, because both are involved in running containers, but the kubelet is the agent that reports status to the control plane, while the runtime only executes containers locally.
Detailed technical explanation
The kubelet uses the CRI to interface with the container runtime, and it also implements the Pod lifecycle event generator (PLEG) to periodically relist containers and detect state changes. In a real-world scenario, if the kubelet fails or becomes unresponsive, the node is marked as NotReady by the node controller after a timeout (default 40 seconds), and Pods on that node may be rescheduled, demonstrating the kubelet's critical role as the node's heartbeat to the control plane.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: kubelet — The kubelet is the primary node agent that runs on every 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) to start, stop, and monitor containers. The kubelet then reports the status of the node and its Pods back to the control plane via the Kubernetes API server, using heartbeats (NodeStatus updates) and Pod status updates.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA 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 CKA exam.
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