Now let's start building a real, albeit simple, Kubernetes cluster. We begin to give some definitions, useful to clarify ideas:
Kubeadm: A tool for quickly installing Kubernetes and setting up a secure cluster. You can use kubeadm to install both the control plane and the worker node components.
Kubectl: a command line tool for communicating with a Kubernetes API server. You can use kubectl to create, inspect, update, and delete Kubernetes objects.
Kubelet: an agent that runs on each node in the cluster. It makes sure that containers are running in a Pod. The kubelet takes a set of PodSpecs that are provided through various mechanisms and ensures that the containers described in those PodSpecs are running and healthy. The kubelet doesn’t manage containers which were not created by Kubernetes.
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At this point we are ready with the installation of Kubeadm, Kubectl and Kubelet on all VM of the cluster (procedure valid, as well as for CentOS, also for RedHat and Fedora)
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