Host ‘xxx‘ is not allowed to connect to this MySQL server 解决方法

Host 'xxx' is not allowed to connect to this MySQL server 解决方法

参考文章：

（1）Host 'xxx' is not allowed to connect to this MySQL server 解决方法

（2）https://www.cnblogs.com/kldn208/p/11668435.html

备忘一下。