[etcd] Failed to bring up Etcd Plane: etcd cluster is unhealthy

使用Rancher搭建集群，执行脚本后，安装报错[etcd] Failed to bring up Etcd Plane: etcd cluster is unhealthy

原因： 安装Rancher的主机之前有残留的集群安装文件，在新安装时有冲突，导致部分文件安装失败

问题解决：把残留文件清掉，重新安装就可以了

docker stop $(docker ps -aq)
docker system prune -f
docker volume rm $(docker volume ls -q)
docker image rm $(docker image ls -q)
rm -rf /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

亲测，有用！