linux下mysql的root密码忘记解决方法
1.首先确认服务器出于安全的状态,也就是没有人能够任意地连接MySQL数据库。
因为在重新设置MySQL的root密码的期间,MySQL数据库完全出于没有密码保护的
状态下,其他的用户也可以任意地登录和修改MySQL的信息。可以采用将MySQL对
外的端口封闭,并且停止Apache以及所有的用户进程的方法实现服务器的准安全
状态。最安全的状态是到服务器的Console上面操作,并且拔掉网线。
2.修改MySQL的登录设置:
# vi /etc/my.cnf
在[mysqld]的段中加上一句:skip-grant-tables
例如:
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables
保存并且退出vi。
3.重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
4.登录并修改MySQL的root密码
# /usr/bin/mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3 to server version: 3.23.56
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> USE mysql ;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> UPDATE user SET Password = password ( 'new-password' ) WHERE User = 'root' ;
Query OK, 0 rows affected (0.00 sec)
Rows matched: 2 Changed: 0 Warnings: 0
mysql> flush privileges ;
Query OK, 0 rows affected (0.01 sec)
mysql> quit
Bye
5.将MySQL的登录设置修改回来
# vi /etc/my.cnf
将刚才在[mysqld]的段中加上的skip-grant-tables删除
保存并且退出vi。
6.重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
《FROM:http://www.cnblogs.com/allenblogs/archive/2010/08/12/1798247.html》
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另外一种破解root或其它帐号密码的方法:
打开一个终端窗口,输入mysqld_safe --skip-grant-tables
[root@rhel2 mysql]# mysqld_safe --skip-grant-tables 170918 15:18:05 mysqld_safe Logging to '/var/log/mariadb/mariadb.log'. 170918 15:18:05 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
再打开另外一个窗口,输入mysql后不用输入密码就能直接登录进去,然后修改user表里用户的密码。
[root@rhel2 ~]# mysql Welcome to the MariaDB monitor. Commands end with ; or \g. Your MariaDB connection id is 1 Server version: 5.5.56-MariaDB MariaDB Server Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. MariaDB [(none)]> use mysql; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed MariaDB [mysql]> select user(); +--------+ | user() | +--------+ | root@ | +--------+ 1 row in set (0.00 sec) MariaDB [mysql]> select host,user,password from user; +-----------+------+-------------------------------------------+ | host | user | password | +-----------+------+-------------------------------------------+ | localhost | root | *09205D393DCDFAFF76E0D479E00C71C2F090C606 | | 127.0.0.1 | root | *09205D393DCDFAFF76E0D479E00C71C2F090C606 | | ::1 | root | *09205D393DCDFAFF76E0D479E00C71C2F090C606 | +-----------+------+-------------------------------------------+ 3 rows in set (0.00 sec) MariaDB [mysql]> update user set password=password('123456') where user='root'; Query OK, 3 rows affected (0.00 sec) Rows matched: 3 Changed: 3 Warnings: 0 MariaDB [mysql]> select host,user,password from user; +-----------+------+-------------------------------------------+ | host | user | password | +-----------+------+-------------------------------------------+ | localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | | 127.0.0.1 | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | | ::1 | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | +-----------+------+-------------------------------------------+ 3 rows in set (0.00 sec) MariaDB [mysql]>
修改完成后,直接关闭第一个窗口。然后重启mariadb,使用新密码登录。