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sudo vim /etc/mysql/my.cnf 把bind-address参数的值改成你的内/外网IP或0.0.0.0,或者直接注释掉这行.

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mysql -u root -p
#输入密码
mysql > use mysql;

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mysql> select user,host from user;

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#如果没有"%"这个host值,就执行下面这两句:
mysql> update user set host='%' where user='root';
mysql> flush privileges;

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#任意主机以用户root和密码mypwd连接到mysql服务器
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'mypwd' WITH GRANT OPTION;
mysql> flush privileges;

#IP为192.168.1.102的主机以用户myuser和密码mypwd连接到mysql服务器
mysql> GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.102' IDENTIFIED BY 'mypwd' WITH GRANT OPTION; 
mysql> flush privileges;