GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘xxxxx‘ WITH GRANT OPTION;    

flush PRIVILEGES;

MySQL [(none)]> GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘admin123‘ WITH GRANT OPTION;                           
Query OK, 0 rows affected (0.00 sec)

MySQL [(none)]> flush PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

//删除远程权限
MySQL [mysql]> delete from mysql.user where user=‘root‘ and host=‘%‘;