mysql主从复制
https://www.cnblogs.com/superfat/p/5267449.html
https://www.cnblogs.com/phpstudy2015-6/p/6485819.html
https://blog.csdn.net/deeplearnings/article/details/78398526
原文：https://www.cnblogs.com/stono/p/9756461.html
