has been resolved to the host name which resembles IPv4-address itself

[Warning] IP address '192.168.0.212' has been resolved to the host name '212.def.gh', which resembles IPv4-address itself.

添加skip-name-resolve，跳过IP反解析成域名的过程，促使客户端建立连接加快。这样只是影响MySQL不能使用主机名来授权给用户

#编辑文件
vim /etc/my.cnf

#添加参数
[mysqld]
skip-name-resolve