登录mysql:
//赋予root用户所有权限，远程登录密码是123456
grant all privileges on *.* to ‘root‘ @‘%‘ identified by ‘123456‘; flush privileges;
Linux防火墙默认拦截3306端口
/sbin/iptables -I INPUT -p tcp --dport 3306 -j ACCEPT /etc/rc.d/init.d/iptables save
原文：https://www.cnblogs.com/dichuan/p/8977239.html