Mysql 本地主机!= 127.0.0.1？

Question

$ mysql -u root -h 127.0.0.1 -e 'show tables' created_from_host;
+-----------------------------+
| Tables_in_created_from_host |
+-----------------------------+
| test                        |
+-----------------------------+

$ mysql -u root -h localhost -e 'show tables' created_from_host;
ERROR 1049 (42000): Unknown database 'created_from_host'

$ cat /etc/hosts
127.0.0.1       localhost.localdomain localhost
127.0.0.1       localhost
::1     localhost6.localdomain6 localhost6

怎么可能呢？主要问题 - 如何从所有主机授予 root 对所有数据库的所有权限？

更新:

$ mysql -u root -h 127.0.0.1 -pzenoss -e "show grants";
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*3715D7F2B0C1D26D72357829DF94B81731174B8C' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION                                                                           |
+----------------------------------------------------------------------------------------------------------------------------------------+
$ mysql -u root -h localhost -pzenoss -e "show grants";
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*3715D7F2B0C1D26D72357829DF94B81731174B8C' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION                                                                           |
+----------------------------------------------------------------------------------------------------------------------------------------+

UPD2:

zends> SHOW GLOBAL VARIABLES LIKE 'skip_networking';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| skip_networking | OFF   |
+-----------------+-------+
1 row in set (0.00 sec)

zends> SELECT user,host FROM mysql.user WHERE user='root'; 
+------+-----------------------+
| user | host                  |
+------+-----------------------+
| root | 127.0.0.1             |
| root | ::1                   |
| root | localhost             |
| root | localhost.localdomain |
+------+-----------------------+
4 rows in set (0.00 sec)

Answer 1

如你所见here , 如果在没有主机名的情况下使用或使用主机名localhost，则 UNIX mysqld 使用套接字。

所以它产生了差异，并且在 GRANT 系统中这种差异变得很明显。