k8s安装集群版mysql以及遇到的坑
参考：https://kubernetes.io/zh/docs/concepts/storage/storage-classes/https://kubernetes.io/docs/tasks/run-application/run-replicated-stateful-application/https://github.com/kubernetes-retired/external-storage/tree/master/nfshttps://www.jianshu.com/p/65e
