https://www.cnblogs.com/sanduzxcvbnm/p/13072429.html
https://www.codercto.com/a/29041.html
leaderelection:https://blog.csdn.net/qingdao666666/article/details/105065701
iostat:https://github.com/control-center/serviced/blob/develop/utils/iostat/iostat.go