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I installed kubernetes cluster using kubeadm following this guide. After some period of time, I decided to reinstall K8s but run into troubles with removing all related files and not finding any docs on official site how to remove cluster installed via kubeadm. Did somebody meet the same problems and know the proper way of removing all files and dependencies? Thank you in advance.
For more information, I removed kubeadm, kubectl and kubelet using apt-get purge/remove but when I started installing the cluster again I got next errors:
[preflight] Some fatal errors occurred: Port 6443 is in use Port 10251 is in use Port 10252 is in use /etc/kubernetes/manifests is not empty /var/lib/kubelet is not empty Port 2379 is in use /var/lib/etcd is not empty 
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First, confirm the name of the node you want to remove using kubectl get nodes , and make sure that all of the pods on the node can be safely terminated without any special procedures. Next, use the kubectl drain command to evict all user pods from the node.
In my "Ubuntu 16.04", I use next steps to completely remove and clean Kubernetes (installed with "apt-get"):
kubeadm reset sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube* sudo apt-get autoremove sudo rm -rf ~/.kube And restart the computer.
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use kubeadm reset command. this will un-configure the kubernetes cluster.
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