mysql忘记密码

[root@master-01 ~]# mysql -uroot -p123
Warning: Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

在 /etc/my.cnf 配置文件里的 mysqld模块下 打开 skip-grant-tables的注释，

该注释打开就是默认登陆mysql不需要密码登陆。

更改完配置重启服务使配置生效。

[root@master-01 ~]# mysql -uroot -p
Enter password:   #这里直接按回车什么都不输入
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.6.39-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 mysql;
mysql> update user set password=password('123') where user='root'; #将密码改为123；

ctrl+c退出数据库

使用123密码登陆数据库

[root@master-01 ~]# mysql -uroot -p123     
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 3
Server version: 5.6.39-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> 

成功登陆，完成修改密码操作。