https://blog.csdn.net/wzy0623/article/details/81304654
https://www.cnblogs.com/keerya/p/7883766.html
https://www.jianshu.com/p/be335429ce47
http://www.ttlsa.com/mysql/step-one-by-one-deploy-mysql-mha-cluster/
https://blog.csdn.net/weixin_34336526/article/details/93610235
