Extended Rancher 2 cleanup (backup your data, use at your own risk)

extended-cleanup-rancher2.sh

#!/bin/sh
# Backup your data
# Use at your own risk
# Usage ./extended-cleanup-rancher2.sh
# Include clearing all iptables: ./extended-cleanup-rancher2.sh flush
docker rm -f $(docker ps -qa)
docker rmi -f $(docker images -q)
docker volume rm $(docker volume ls -q)
for mount in $(mount | grep tmpfs | grep '/var/lib/kubelet' | awk '{ print $3 }') /var/lib/kubelet /var/lib/rancher; do umount $mount; done
cleanupdirs="/etc/ceph /etc/cni /etc/kubernetes /opt/cni /opt/rke /run/secrets/kubernetes.io /run/calico /run/flannel /var/lib/calico /var/lib/etcd /var/lib/cni /var/lib/kubelet /var/lib/rancher/rke/log /var/log/containers /var/log/pods /var/run/calico"
for dir in $cleanupdirs; do
  echo "Removing $dir"
  rm -rf $dir
done
cleanupinterfaces="flannel.1 cni0 tunl0"
for interface in $cleanupinterfaces; do
  echo "Deleting $interface"
  ip link delete $interface
done
if [ "$1" = "flush" ]; then
  echo "Parameter flush found, flushing all iptables"
  iptables -F -t nat
  iptables -X -t nat
  iptables -F -t mangle
  iptables -X -t mangle
  iptables -F
  iptables -X
  /etc/init.d/docker restart
else
  echo "Parameter flush not found, iptables not cleaned"
fi

I highly appreciate you script, but there is one severe problem making it (almost) unusable for me: It removes unrelated docker containers and images.

Somewhere I read the recommendation, to use the "legacy" iptables command instead of the version based on nftables, so I tried. Apparently these tables were never cleaned up. After running the script with "flush" iptables-save showed me a message "Warning: iptables-legacy tables present, use iptables-legacy-save to see them". Very hard to detect. Maybe it would be helpful to flush these tables as well?
(https://v1-15.docs.kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/)

Your shared shell script is effective. I was stuck on this issue for a long time and even asking GPT couldn't solve it. Thank you for sharing.
非常謝謝你～好用！

Thank you @superseb. Your script worked well