首先进入mysql：
mysql -u root
如果有密码会提示输入密码
然后输入如下授权代码，
如下即授权用户root使用密码admin123从任何主机连接到mysql服务器
GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘admin123‘ WITH GRANT OPTION; flush privileges;
如果只需要某一个ip段访问，可以参考下面：
GRANT ALL PRIVILEGES ON *.* TO ‘myuser‘@‘192.168.1.%‘ IDENTIFIED BY ‘admin123‘ WITH GRANT OPTION;
flush privileges;