Tôi sử dụng tài khoản root đã tạo tài khoản 'a'@'%'
. Nhưng tôi không thể sử dụng tài khoản để kết nối với máy chủ MySQL khi tôi chỉ định tham số máy chủ. Tôi có thể kết nối thành công mà không cần -h
tham số. Xin vui lòng xem bảng điểm dưới đây. Tôi hy vọng ai đó có thể giúp tôi giải thích nó. Cảm ơn.
mysql> grant all on *.* to 'a'@'%' identified by a;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'a' at line 1
mysql> grant all on *.* to 'a'@'%' identified by 'a';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for 'a'@'%';
+-----------------------------------------------------------------------------------------------------------+
| Grants for a@% |
+-----------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'a'@'%' IDENTIFIED BY PASSWORD '*667F407DE7C6AD07358FA38DAED7828A72014B4E' |
+-----------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> exit
Bye
[root@localhost ~]# mysql -h localhost -u a -p
Enter password:
ERROR 1045 (28000): Access denied for user 'a'@'localhost' (using password: YES)
[root@localhost ~]# mysql -h 127.0.0.1 -u a -p
Enter password:
ERROR 1045 (28000): Access denied for user 'a'@'localhost' (using password: YES)
[root@localhost ~]# mysql -u a -p
Enter password:
ERROR 1045 (28000): Access denied for user 'a'@'localhost' (using password: YES)
[root@localhost ~]# mysql -u a
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 20
Server version: 5.5.17 MySQL Community Server (GPL)
Copyright (c) 2000, 2011, 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>
mysql> status
--------------
mysql Ver 14.14 Distrib 5.5.17, for Linux (x86_64) using readline 5.1
Connection id: 20
Current database:
Current user: a@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 5.5.17 MySQL Community Server (GPL)
Protocol version: 10
Connection: Localhost via UNIX socket
Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8
UNIX socket: /var/lib/mysql/mysql.sock
Uptime: 15 days 15 hours 20 min 18 sec
Threads: 1 Questions: 40 Slow queries: 0 Opens: 41 Flush tables: 1 Open tables: 4 Queries per second avg: 0.000
--------------
mysql>
Chỉnh sửa:
Có, MySQL đang nghe trên cổng 3306.
[root@localhost ~]# nmap localhost
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2012-01-18 07:35 CST
Interesting ports on localhost.localdomain (127.0.0.1):
Not shown: 1674 closed ports
PORT STATE SERVICE
22/tcp open ssh
25/tcp open smtp
111/tcp open rpcbind
631/tcp open ipp
840/tcp open unknown
3306/tcp open mysql
Nmap finished: 1 IP address (1 host up) scanned in 0.064 seconds
[root@localhost ~]#
'a'@'%'
. vì vậy, bản ghi đầu tiên là'a'@'%'
, và bản thứ hai là'a'@'localhost'
.