mysql 忘记密码处理办法

MySQL忘记root密码的处理办法

1.编辑/etc/my.cnf文件

1）在[mysqld]下添加以下内容：

skip-grant-tables

2）重启mysql服务

# service mysqld restart

Shutting down MySQL.. SUCCESS! 
Starting MySQL. SUCCESS!

2.直接进入mysql

# mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.25 MySQL Community Server (GPL)
Copyright (c) 2000, 2019, 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>

3.修改回密码

1）查看密码

mysql> select user,host,authentication_string from mysql.user;

+---------------+-----------+-------------------------------------------+
| user          | host       | authentication_string                   |
+---------------+-----------+-------------------------------------------+
| root          | localhost | *8232A1298A49F710DBEE0B330C42EEC825D4190A |
| mysql.session | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
| mysql.sys     | localhost | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE |
+---------------+-----------+-------------------------------------------+
3 rows in set (0.00 sec)

2）修改密码
情况一：mysql 5.7.6 or later版本

mysql> update mysql.user set authentication_string=password('P@ssw0rd') where user='root';

情况二：mysql 5.7.5 or earlier版本

mysql> update mysql.user set password=password("P@ssw0rd") where user="root" and host="localhost";

4.修改配置文件，重启MySQL

1）修改my.cnf文件
删除或注释skip-grant-tables
2）重启mysql

# service mysqld restart

Shutting down MySQL.. SUCCESS! 
Starting MySQL. SUCCESS!

3）新密码验证

# mysql -uroot -p'P@ssw0rd'

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