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ERROR 1044 (42000) : Access denied for user ‘root’@'localhost’
2018-10-08 16:10:35 】 浏览:26
Tags:ERROR 1044 42000 Access denied for user root @' localhost

从供应商那边接手一个MySQL数据库数据库版本为5.7.21 MySQL Community Server (GPL)),在创建账号时遇到了“ERROR 1044 (42000): Access denied for user ‘root’@'localhost’ to database xxx”错误,如下所示

mysql> grant all on xxx.* to xxx@'192.168.%' identified by 'xxx';
ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'xxxx'
mysql>

照理说,root用户应该有任何权限,那么为什么出现这个错误呢? 查看当前用户为root@localhost,顺便查看了一下各个root账号的权限。如下所示:

mysql> select current_user() from dual;
+----------------+
| current_user() |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec
 
mysql> select host,user from user where user='root';
+-----------+----------+
| host      | user     |
+-----------+----------+
| %         | root     |
| 127.0.0.1 | root     |
| ::1       | root     |
| localhost | root     |
+-----------+----------+
7 rows in set (0.00 sec)
 
mysql>  show grants for root@'localhost';
+--------------------------------------------------------------+
| Grants for root@localhost                                    |
+--------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost'            |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION |
+--------------------------------------------------------------+
2 rows in set (0.00 sec)
 
mysql> show grants for root@'127.0.0.1';
+---------------------------------------------------------------------+
| Grants for root@127.0.0.1                                           |
+---------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'127.0.0.1' WITH GRANT OPTION |
+---------------------------------------------------------------------+
1 row in set (0.00 sec)
 
mysql> show grants for root@'%';
+-------------------------------------------+
| Grants for root@%                         |
+-------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' |
+-------------------------------------------+
1 row in set (0.00 sec)

如上所示,root@localhost账号没有WITH GRANT OPTION选项,关于WITH GRANT OPTION选项,如果想让授权的用户,也可以将这些权限授予给其他用户,需要选项 “WITH GRANT OPTION“ 。也就是说有这个选项就可以将权限传递给第三方。这也是上面root@localhost用户给其它用后授权报错的原因,如果以 root@127.0.0.1登录(此账号拥有WITHGRANT OPTION选项),创建用户并授权就不会有这个错误,如下所示:

# mysql -host 127.0.0.1 -u root -p
Enter password: 
 
mysql>  grant all on xxx.* to xxx@'192.168.%' identified by 'test1249';
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

当然还有其它方面的原因也可能会引起这个错误,不过在这个案例当中,确实仅仅是因为上面原因引起。特此记录一下这个案例@!


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