After removing Kubernetes 1.15 (master and worker node):
kubeadm reset
apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*and removing all config files and installing again 1.17 getting this error while joining cluster:
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace
error execution phase kubelet-start: configmaps "kubelet-config-1.15" is forbidden: User "system:bootstrap:fmhnus" cannot get resource "configmaps" in API group "" in the namespace "kube-system"What did I miss and where?
Follow these steps to completely remove Kubernetes
kubeadm reset
sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*
sudo apt-get autoremove
sudo rm -rf ~/.kube
kubeadm reset un-configures the cluster made by kubernetes.