在 MySQL 8 中重置 root 密码

Question

When I use the method to reset the root password described on How to Reset the Root Password , starting the server with mysqld --init-file=/home/username/init-file doesn't work.

It gives the following error.

[Server] Could not open /var/log/mysqld.log file for error logging: Permission denied.

Permissions are correct.

Server starts when I use service mysqld start .

I am using MySQL 8.0.12 on Fedora 28.

Answer 1

If you can log in to your MySQL server and you want to change your password by query you can do it this queries:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

or removing the root password:

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '';

Thanks to this blog: https://juejin.im/entry/5b06698cf265da0db3501fdd

Also answered the same question here: https://stackoverflow.com/a/54511940/1157720

Answer 2

只需在您的 PHPmysql shell 中键入以下命令。

ALTER USER 'root'@'localhost' IDENTIFIED BY 'password'

Answer 3

You need to be the owner or group of /var/log/mysqld.log before you can do this. It's crashing because it can't write to it's log file.

If you do ls -l /var/log/mysqld.log you can see who owns it, then do su - username before attempting to start mysql.

You may need to become root (OS root user, not mysql root) to do this, depending on how your system was setup.

Here is what the permissions and ownership is supposed to be:

https://dev.mysql.com/doc/mysql-secure-deployment-guide/5.7/en/secure-deployment-permissions.html