线上新建一个db，远程telnet xx 3306报错如下：
[xxx@xxx cacti]$ telnet db01.xx.com 3306 Trying xx.xx.xx.1... Connected to db01.xx.com. Escape character is '^]'. YHost 'db01.xx.com' is not allowed to connect to this MySQL serverConnection closed by foreign host.[xxx@xxx c
