本地连接远程环境mysql报错：Host'xxx.xxx.xxx.xxx' is not allowed to connect to this MySQL server

　　问题现象：本机连接远程环境的mysql数据库报错，提示本机ip无法连接到mysql服务器。

　　问题原因：本机对远程mysql数据库没有访问权限。

　　解决方法：在远程mysql数据库添加本机ip的访问权限：

　　1、登陆远程mysql，这里的用户名和密码都是root

[root@izwz932ypmamm80m434qqyz ~]# mysql -uroot -proot
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 20
Server version: 5.5.55-log MySQL Community Server (GPL) by Atomicorp

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.

　　2、进入mysql数据库，查询用户表

mysql> use mysql;
Database changed
mysql> select user,password,host from user;
+------+-------------------------------------------+-------------------------+
| user | password                                  | host                    |
+------+-------------------------------------------+-------------------------+
| root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | localhost               |
| root |                                           | izwz932ypmamm80m434qqyz |
| root |                                           | 127.0.0.1               |
| root |                                           | ::1                     |
|      |                                           | localhost               |
|      |                                           | izwz932ypmamm80m434qqyz |
+------+-------------------------------------------+-------------------------+
6 rows in set (0.00 sec)

　　3、添加本机ip（这里为117.149.10.46），用户名密码还是设置为root

mysql> grant all privileges on *.* to root@"117.149.10.46" identified by "root";
Query OK, 0 rows affected (0.00 sec)

mysql> select user,password,host from user;                                     +------+-------------------------------------------+-------------------------+
| user | password                                  | host                    |
+------+-------------------------------------------+-------------------------+
| root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | localhost               |
| root |                                           | izwz932ypmamm80m434qqyz |
| root |                                           | 127.0.0.1               |
| root |                                           | ::1                     |
|      |                                           | localhost               |
|      |                                           | izwz932ypmamm80m434qqyz |
| root | *81F5E21E35407D884A6CD4A731AEBFB6AF209E1B | 117.149.10.46           |
+------+-------------------------------------------+-------------------------+
7 rows in set (0.00 sec)

　　4、重新加载mysql的访问权限

mysql>flush privileges;

　　本机重新连接远程mysql成功。