Which component on a node is primarily responsible for running containers as specified in Pod definitions?

Which component on a node is primarily responsible for running containers as specified in Pod definitions?

• A. Kubelet
• B. Container Runtime
• C. API Server
• D. Scheduler

Answer: (A)

On each worker node, the Kubelet acts as the node agent that enforces Pod specifications. It watches for Pods assigned to its node and, using the container runtime interface, starts and manages the containers described in those Pod definitions. The actual execution of containers is done by the container runtime (such as containerd or Docker), but the Kubelet drives that execution, translating Pod specs into runtime actions and ensuring the desired state is maintained. The API Server is part of the control plane that stores and serves cluster state, while the Scheduler assigns Pods to nodes; neither starts containers on the node by itself.

On each worker node, the Kubelet acts as the node agent that enforces Pod specifications. It watches for Pods assigned to its node and, using the container runtime interface, starts and manages the containers described in those Pod definitions. The actual execution of containers is done by the container runtime (such as containerd or Docker), but the Kubelet drives that execution, translating Pod specs into runtime actions and ensuring the desired state is maintained. The API Server is part of the control plane that stores and serves cluster state, while the Scheduler assigns Pods to nodes; neither starts containers on the node by itself.