关于主从复制：异步复制、半同步复制：
https://blog.csdn.net/keil_wang/article/details/88669587
https://cloud.tencent.com/developer/article/1544449
关于MySQL密码：http://cenalulu.github.io/mysql/myall-about-mysql-password//
MySQL的GTID:https://www.cnblogs.com/zhoujinyi/p/4717951.html