问题现象：
The node was low on resource: ephemeral-storage. Container rama-manager was using 104Ki, which exceeds its request of 0.
原因磁盘空间占用过多。
解决思路参考链接：
https://yuerblog.cc/2020/03/29/kubernetes-%E7%A3%81%E7%9B%98%E7%A9%BA%E9%97%B4%E4%B8%8D%E8%B6%B3%E5%AF%BC%E8%87%B4pod%E9%A9%B1%E9%80%90%EF%BC%88eviction%EF%BC%89/
查找K8S中高磁盘占用Pod