MySQL 可以用localhost 连接，但不能用IP连接的问题解决方法

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1.打开cmd窗口，进入MySQL安装的bin目录

2.执行命令登录数据库,之后会出现一行要你输入密码的 mysql -u root -p

3.执行以下命令分配新用户：

grant all privileges on . to ‘root’@’%’ identified by ‘root’; (%) 表示所有ip

4.执行完上述命令后用下面的命令刷新权限

[root@MyCloudServer /]# mysql -u root -p 
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 14384
Server version: 5.7.18-log Source distribution

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> grant all privileges on *.* to 'root'@'%' identified by 'root';
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

5.之后关闭mysql服务，然后启动mysql服务