集群存在大量无状态（terminated）pod 切不会自动清理问题：

修改/etc/kubernetes/manifests/kube-controller-manager.yaml里的command命令后追加：

https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager

--terminated-pod-gc-threshold int32     Default: 12500
Number of terminated pods that can exist before the terminated pod garbage collector starts deleting terminated pods. If <= 0, the terminated pod garbage collector is disabled.

默认到达12500数量后才会清理，可以自定义设置更小的数量来gc