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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文章来源: ITPUB