CentOS7系统下修改mysql8.0版本密码

CentOS7系统下修改mysql8.0版本密码

忘记mysql登录密码是很常见的操作,今天讲一下linux centos7下mysql8.0版本修改密码的方法。

踩坑

网上很多文章说的是mysql5.x版本的修改密码方法,按照这些方法做就会遇到坑了。

忘记密码了,首先尝试修改mysql的配置文件/etc/my.cnf,有的人安装目录可能不太一样,配置文件会是/etc/mysql/my.cnf或者其他的目录下。

mysql配置文件

在[mysqld]下面添加一行,可以跳过密码登录

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skip-grant-tables

重启mysqld服务

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service mysqld restart

输入mysql回车进入mysql命令行,尝试执行

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update user set password=password("123456") where user="root";

直接就报语句错误了,看来可能是password函数有问题。

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘(“123456”) where user=”root”‘ at line 1

接着尝试另一个方法。

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mysql> ALTER USER 'root'@'*' IDENTIFIED WITH mysql_native_password BY '123456'

也报错,–skip-grant-tables模式下,不能运行这条语句。

ERROR 1290 (HY000): The MySQL server is running with the –skip-grant-tables option so it cannot execute this statement

于是我先查查user表的数据。

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select user, password from user

mysql8 user表没有password列
发现user表中根本没有password这个字段,上网查了后发现只有authentication_string,在mysql5.7.9后就废弃了password字段和password()函数。

需要先将authentication_string设置为空

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update user set authentication_string = ‘’ where user = ‘root’;

然后退出mysql,删除/etc/my.cnf的skip-grant-tables,重启mysqld服务。

接着尝试登录mysql

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mysql -uroot -p

直接回车登录mysql,再使用alter修改用户密码

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alter user ‘root’@’%’ indentified by ‘123456’;

提示成功!!!


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