清理Rancher节点
rancher重新部署，清理不干净的话是个很头疼的事情，残留的Kubernetes组件可能导致资源冲突或部署失败，以下是官方标准清理流程：
#复制粘贴就可以，亲测无误（注意根据实际情况修改安装目录/var/lib/rancher）
systemctl disable kubelet.service
systemctl disable kube-scheduler.service
systemctl disable kube-proxy.service
systemctl disable kube-controller-manager.service
systemctl disable kube-apiserver.service
systemctl stop kubelet.service
systemctl stop kube-scheduler.service
systemctl stop kube-proxy.service
systemctl stop kube-controller-manager.service
systemctl stop kube-apiserver.service
docker ps -a |egrep rancher |awk '{print $1}' |xargs docker rm -f
docker ps -a |egrep k8s |awk '{print $1}' |xargs docker rm -f
docker volume ls |grep -v openvpn |grep -v DRIVER |awk '{print $2}' |xargs docker volume rm
rm -rf /var/lib/etcd/
rm -rf /var/lib/rancher/
umount $(df -HT | grep '/var/lib/kubelet/pods' | awk '{print $7}')
rm -rf /etc/kubernetes
rm -rf /var/lib/etcd
rm -rf /var/lib/rancher
rm -rf /opt/rke/
rm -rf /etc/ceph/
rm -rf /etc/cni/
rm -rf /opt/cni/
rm -rf /run/secrets/kubernetes.io
rm -rf /run/calico/
rm -rf /run/flannel/
rm -rf /var/lib/calico/
rm -rf /var/lib/cni/
rm -rf /var/lib/kubelet/
rm -rf /var/log/containers/
rm -rf /var/log/pods/
network_interface=`ls /sys/class/net`
for net_inter in $network_interface;
do
if ! echo $net_inter | grep -qiE 'lo|docker0|eth*|ens*';then
ip link delete $net_inter
fi
done
#因为k8s会进行一些临时配置：防火墙、网络缓存等，需要重启服务器
sudo reboot
