现象：MountVolume.SetUp failed for volume "secret-etcd-ssl" : secret "etcd-ssl" not found
处理方法：kubectl -n monitoring create secret generic etcd-ssl --from-file=/opt/etcd/ssl/server.pem --from-file=/opt/etcd/ssl/server-key.pem --from-file=/opt/etcd/ssl/ca.pem
