Kubelet runs in kubernetes worker node. It registers a node in the cluster. It receives request to create POD from kube-api-server, it then requests run time engine like docker to pull the image and run an instance. It continues to monitors the state of the POD and its containers in in the node. Kubeadm does not automatically install kubelet. You need to download the kubernetes release binaries for kubelet and install manually as a service.
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