In the context of Kubernetes, which component on a node is responsible for running containers as specified in the Pod definitions?

• A. Kubelet
• B. Container Runtime
• C. Node Manager
• D. Pod Launcher

Answer: (A)

On a node, the agent that ensures pods run as defined is the Kubelet. It runs on every node and watches for Pod specifications from the API server, then uses the container runtime (such as containerd or Docker via the CRI) to start and manage the containers described in those Pods. The Kubelet handles scheduling decisions at the node level, applies resource limits, configures volumes and networking, and monitors container health, restarting containers as needed to match the desired state. The container runtime is the underlying system that actually executes containers, but it relies on the Kubelet to tell it which containers to run and how, whereas the other options aren’t components that manage Pods on nodes.