I was looking at this url.
It says-"If you already have a way to configure hosting resources, use kubeadm to easily bring up a cluster with a single command per machine."
What do you mean by "If you already have a way to configure hosting resources"?
If I have a few Ubuntu machines within my office LAN can I setup Kubernetes cluster on them using kubeadm?
It just means that you already have a way of installing an OS on these machines, booting them, assigning IPs on your LAN and so. If you can SSH into your nodes to be you are ready!
Follow the guide carefully and you will have a demo cluster in no time.