Home Database Mysql Tutorial mysql Access denied for user root@localhost错误解决方法总结

mysql Access denied for user root@localhost错误解决方法总结

Jun 07, 2016 pm 05:52 PM
mysql mistake

mysql Access denied for user \'root\'@\'localhost\'”解决办法总结,下面我们对常见的出现的一些错误代码进行分析并给出解决办法,有需要的朋友可参考一下。

错误代码 1045

Access denied for user 'root'@'localhost' (using password:YES)

解决办法是重新设置root用户密码,在Windows平台下操作步骤如下:
1、以系统管理员身份登录到系统;
2、如果MySQL服务器正在运行,停止它。
  如果是作为Windows服务运行的服务器,进入服务管理器:开始菜单->控制面板->管理工具->服务
  如果服务器不是作为服务而运行的,可能需要使用任务管理器来强制停止它。
3、创建1个文本文件,并将下述命令置于单一行中:
  SET PASSWORD FOR 'root'@'localhost' = PASSWORD('MyNewPassword');
  用任意名称保存该文件。在本例中,该文件为C:mysql-init.txt。
4、进入DOS命令提示:开始菜单->运行-> cmd
  假定你已将MySQL安装到C:mysql。如果你将MySQL安装到了另一位置,请对下述命令进行相应的调整。
  在DOS命令提示符下,执行命令:
  C:> C:mysqlbinmysqld-nt --init-file=C:mysql-init.txt
  在服务器启动时,执行由“--init-file”选项(作用:在启动时从指定的文件中读取SQL命令)命名的文件的内容,更改根用户密码。当服务器成功启动后,应删除C:mysql-init.txt。
5、停止MySQL服务器,然后在正常模式下重启它。如果以服务方式运行服务器,应从Windows服务窗口启动它。如果以手动方式启动了服务器,能够像正常情形下一样使用命令。
应能使用新密码进行连接。


我的系统是Ubuntu6.06,最近新装好的mysql在进入mysql工具时,总是有错误提示:

# mysql -uroot -p
Enter password:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

使用网上介绍的方法修改root用户的密码:

 代码如下 复制代码
# mysqladmin -uroot -p password 'newpassword'
Enter password:
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: YES)'

现在终于被我找到了解决方法,如下(请先测试方法三,谢谢!):

方法一:

 代码如下 复制代码

# /etc/init.d/mysql stop
# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
# mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit

# /etc/init.d/mysql restart
# mysql -uroot -p
Enter password:


另一篇关于linux错误


Red Hat Enterprise Linux 5服务器上mysql启动报错:ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
原因1-启动命令错误:
我开始的时候直接输入命令:mysql start
正确的启动命令是:
/etc/rc.d/init.d/mysql start

原因2-配置文件错误:
检查etc下面的my.cnf如下内容:

[client]

 代码如下 复制代码

#password   = your_password
port     = 3306
socket     = /usr/mysql-data/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
port     = 3306
socket     = /usr/mysql-data/mysql.sock


 

原因3-启动文件错误:
需要修改MySQL启动脚本/etc/rc.d/init.d/mysql,
其中datadir=   ?     一行检查下!

原因4-前提是你在使用php连接时候报错!
在/etc/php.ini修改mysql.default_socket的值设置为:
mysql.default_socket=/var/lib/mysql/mysql.sock
回到终点设置个连接:ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
(在/etc/php.ini中mysql.default_socket这个文件中,关于mysql.default_socket的值的说明是这样的,
;Default socket name for local MySQL connects. If empty, uses the built-in MySQL defaults.
这个值一开始是空的,也就是说,如果我们不主动去修改的话,php将会使用内建在mysql中的默认值)


注意:另外还遇到需要service mysql star才能启动service mysql stop才能停止。
还有直接使用mysql不能找到命令,错误为“bash: mysql: command not found”可以直接**mysql的安装目录中的bin文件夹跟绝对路径运行命令,还有的需要加./mysql 才能执行。


mysql修改密码方法有几种

方法一   

使用phpMyAdmin

  (图形化管理MySql数据库的工具),这是最简单的,直接用SQL语句修改mysql数据库库的user表,不过别忘了使用PASSWORD函数,插入用户用Insert命令,修改用户用Update命令,删除用Delete命令。在本节后面有数据表user字段的详细介绍。   

方法二   

  使用mysqladmin。输入  

  mysqladmin -u root -p oldpassword newpasswd  

执行这个命令后,需要输入root的原密码,这样root的密码将改为newpasswd。同样,把命令里的root改为你的用户名,你就可以改你自己的密码了。

  当然如果你的mysqladmin连接不上mysql

  server,或者你没有办法执行mysqladmin,那么这种方法就是无效的,而且mysqladmin无法把密码清空。   

  下面的方法都在mysql提示符下使用,且必须有mysql的root权限:   

方法三   

  mysql> INSERT INTO mysql.user (Host,User,Password) VALUES('%','system', PASSWORD('manager'));

  mysql> FLUSH PRIVILEGES   

  确切地说这是在增加一个用户,用户名为system,密码为manager。注意要使用PASSWORD函数,然后还要使用FLUSH

  PRIVILEGES来执行确认。  

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