详细说明mysql客户端授权后连接失败的问题的处理方法

在本地（192.168.1.152）部署好mysql环境，授权远程客户机192.168.1.%连接本机的mysql，在iptables防火墙也已开通3306端口。

如下：

mysql> 
select host,user,passw
ord
 from mysql.user;
+--------------+-----------------+---------------------------------------------------------+
  host   user   password  
+--------------+-----------------+----------------------------------------------------------+
  localhost   root    
  fdm1   root    
  127.0.0.1   root    
  localhost      
  fdm1      
  192.168.1.%   db_hqsb   *DFC9DC16B13651A95ECEC3A26E07D244431B55C9  
  192.168.1.%   db_ro_hqsb   *2C0B0DD50595BB40879110437BEEF026D019DFB7  
  192.168.1.%   db_jkhwuser   *2C0B0DD50595BB40879110437BEEF026D019DFB7  
  192.168.1.25  slave   *EE52B8EACB3CCD13624273AD6B5CDA52B9B53EB7  
  192.168.1.%   tech_db_user   *6053E57C7B61043DC2C6B4E3291D5F61CCC23F5C  
  192.168.1.%   game_db_user  *05EA4D71C9A1273ECF3E24E6323F7175AE45C366   
  localhost   zabbix   *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9  
+---------------+---------------+------------------------------------------------------------+

问题：

在客户机（比如192.168.1.20）上远程连接上面192.168.1.152机器的mysql，连接失败！

[root@huanqiu ~]# mysql -udb_ro_hqsb -h 192.168.1.152 -pmhxzkhl0802xqsjdb
ERROR 1130 (HY000): Host '192.168.1.20' is not allowed to connect to this MySQL server

解决：

是由于192.168.1.152的mysql里“host为localhost，user和password为空”这条语句导致的，删除这条即可解决问题！

mysql> 
delete
 from mysql.user where host="localhost" and user="";
Query OK, 1 row affected (0.00 sec)
mysql> 
flush
 privileges;
Query OK, 0 rows affected (0.00 sec)

这样，授权连接的客户机就能成功连接了！

[root@huanqiu ~]# mysql -uxqsj_db_ro_user -h 192.168.1.152 -pmhxzkhl0802xqsjdb
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 28
Server version: 5.1.73 Source distribution

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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>

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