MySQL忘记root密码不重启mysqld的方法

Posted 2020-12-26 长城之上是千亿的星空，星空之上是不灭的守望。

mysql忘记root密码不重启mysqld的方法

 

1、首先得有一个可以拥有修改权限的mysql数据库账号，当前的mysql实例账号（较低权限的账号，比如可以修改zabbix数据库）或者其他相同版本实例的账号。把 data/mysql 目录下面的user表相关的文件复制到 data/zabbix 目录下面。

 

[[email protected] mysql]# cp mysql/user.* test/

[[email protected] mysql]# chown mysql.mysql test/user.*

 

2、使用另一个较低权限的账号链接数据库，设置 zabbix 数据库中的 user 存储的密码数据。

 

 

[[email protected] mysql]# mysql -uzabbix -pzabbixpasswd -A 

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 1180

Server version: 5.7.22-log MySQL Community Server (GPL)

 

Copyright (c) 2000, 2018, 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> use zabbix;

Database changed

mysql> update user set authentication_string=password(‘zabbixpasswd‘) where user=‘root‘;

Query OK, 2 rows affected, 1 warning (0.04 sec)

Rows matched: 2 Changed: 2 Warnings: 1

 

 

3、把修改后的user.MYD和user.MYI复制到mysql目录下，记得备份之前的文件。

 

mv mysql/user.MYD mysql/user.MYD.bak

mv mysql/user.MYI mysql/user.MYI.bak

cp zabbix/user.MY* mysql/

chown mysql.mysql mysql/user.*

 

4、kill -SIGHUP 

 

[[email protected]db mysql]# pgrep -n mysql

31650

[[email protected] mysql]#

[[email protected] mysql]# kill -SIGHUP 31650

 

5、测试

[[email protected] mysql]# mysql -uroot -pzabbixpasswd -A 

mysql: [Warning] Using a password on the command line interface can be insecure.

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 1190

Server version: 5.7.22-log MySQL Community Server (GPL)

 

Copyright (c) 2000, 2018, 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.

 

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