需要用户名及密码，可是新安装的mysql是没有密码的，这是为什么？

今天帮朋友试验了一把解决了这个问题：

导致这个错误的原因：

因为安装系统时设置了hostname为localhost导致mysql在创建表的时候没有创建成功。因此mysql库中user表里没有root这个用户或者说root没有显示出来，无法查看root的状态。这时需要手动创建。然而在安全模式无法直接创建用户，错误见下。

变个方向就能创建了，先给root给予权限，然后刷新表。之后就可以创建了。

具体步骤见下。有朋友遇到此问题可以依此解决。

一、killall -TERM mysqld

以安全模式启动mysql

/usr/bin/mysqld_safe --skip-grant-tables &

进入mysql

/usr/bin/mysql

mysql> use mysql

Database changed

mysql> select * from user where user='root';

Empty set (0.00 sec)

mysql> grant all privileges on *.* to root@localhost identified by 'linuxtone' with GRANT OPTION;

ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute

this statement

mysql> update user set password=password('linuxtone') where user='root';

Query OK, 0 rows affected (0.00 sec)

Rows matched: 0  Changed: 0  Warnings: 0

注意单双引号。

mysql> flush privileges;   //注意先刷新下表

Query OK, 0 rows affected (0.00 sec)

mysql> grant all privileges on *.* to root@localhost identified by 'linuxtone' with GRANT OPTION;

Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from user where user='root';

+-----------+------+-------------------------------------------+-------------+-------------+-------------

+-------------+-------------+-----------+-------------+---------------+--------------+-----------+-------

-----+-----------------+------------+------------+--------------+------------+-----------------------+---

---------------+--------------+-----------------+------------------+------------------+----------------+-

--------------------+--------------------+------------------+----------+------------+-------------+------

--------+---------------+-------------+-----------------+----------------------+

| Host      | User | Password                                  | Select_priv | Insert_priv | Update_priv |

Delete_priv | Create_priv | Drop_priv | Reload_priv | Shutdown_priv | Process_priv | File_priv |

Grant_priv | References_priv | Index_priv | Alter_priv | Show_db_priv | Super_priv | Create_tmp_table_priv

| Lock_tables_priv | Execute_priv | Repl_slave_priv | Repl_client_priv | Create_view_priv | Show_view_priv

| Create_routine_priv | Alter_routine_priv | Create_user_priv | ssl_type | ssl_cipher | x509_issuer |

x509_subject | max_questions | max_updates | max_connections | max_user_connections |

+-----------+------+-------------------------------------------+-------------+-------------+-------------

+-------------+-------------+-----------+-------------+---------------+--------------+-----------+-------

-----+-----------------+------------+------------+--------------+------------+-----------------------+---

---------------+--------------+-----------------+------------------+------------------+----------------+-

--------------------+--------------------+------------------+----------+------------+-------------+------

--------+---------------+-------------+-----------------+----------------------+

| localhost | root | *4F9DA9DB95483BFD192C7BF3DB0402555E89360D | Y           | Y           | Y           |

Y           | Y           | Y         | Y           | Y             | Y            | Y         | Y

| Y               | Y          | Y          | Y            | Y          | Y                     | Y

| Y            | Y               | Y                | Y                | Y              | Y

| Y                  | Y                |          |            |             |              |

0 |           0 |               0 |                    0 |

+-----------+------+-------------------------------------------+-------------+-------------+-------------

+-------------+-------------+-----------+-------------+---------------+--------------+-----------+-------

-----+-----------------+------------+------------+--------------+------------+-----------------------+---

---------------+--------------+-----------------+------------------+------------------+----------------+-

--------------------+--------------------+------------------+----------+------------+-------------+------

--------+---------------+-------------+-----------------+----------------------+

1 row in set (0.00 sec)

后期处理：

/usr/local/mysql/bin/mysqladmin shutdown -uroot -p

刚才的密码

然后正常启动：/usr/bin/mysqld_safe &

/usr/local/mysql/bin/mysql -uroot -p

能正常登录！

官方文档

[url]http://dev.mysql.com/doc/refman/5.0/en/resetting-permissions.html[/url]

总结：我这叫总结么？我不知道为啥能成，不过大体就是root无法对库进行操作。select就能查出来。

然后在安全模式下无法授权，那只能升级下密码了。这时注意下刷新表。

然后再给root用户授权。这样就哦了。

有空的哥们也多研究下。

今早哥们netseek 解决了这个问题：

[url]http://www.linuxtone.org/redirect.php?tid=1142&goto=lastpost#lastpost[/url]