Cluster Uninstallation

Delete All Kubernetes Resources

Before uninstalling Kubernetes, ensure that you delete all resources (like pods, services, and volumes) that were created under Kubernetes.

This only needs to be executed once on one of the master nodes)

Graceful delete

kubectl delete all --all -A

Forceful delete (If you encounter an error of being stuck in graceful delete)

kubectl delete all --all -A --grace-period=0 --force

Remove HA cluster

This needs to be executed for each of the master nodes

Drain the HA nodes

kubectl drain <master-node-name> --delete-emptydir-data --force --ignore-daemonsets

Delete HA nodes

kubectl delete node <master-node-name>

Reset Kubeadm

Run on each of the nodes (Master nodes and Worker nodes)

sudo kubeadm reset

Uninstall kubeadm, kubectl, and kubelet

sudo yum -y remove kubeadm kubectl kubelet kubernetes-cni kube*
sudo yum -y autoremove

Remove redundant configurations and files

sudo rm -rf ~/.kube
sudo rm -rf /etc/cni
sudo rm -rf /etc/kubernetes
sudo rm -rf /var/lib/etcd
sudo rm -rf /var/lib/kubelet

Reset iptables

sudo iptables -F && sudo iptables -t nat -F && sudo iptables -t mangle -F && sudo iptables -X

Reset containerd

systemctl restart containerd

Clean up Hosts File

vim /etc/hosts