Why is kubelet needed?

Kubelet is an agent that runs on each node of a Kubernetes cluster. Its main task is to monitor the state of Pods on this node and ensure that the containers described in the manifests are started and functioning correctly.

Kubelet receives instructions from the Kubernetes API server and interacts with the container runtime (such as Docker or containerd) to start and manage containers. If a container crashes or does not match the described state, kubelet attempts to recover it.

Example: if a manifest specifies that a certain pod with an application should run on the node, kubelet monitors to ensure that this pod is running and restarts it in case of failure.