问题
I had to install mysql 8.0 because previous version were crashing.
Now I'm struggling with setting root password. The default empty password doesn't work, I've tried root, mysql as passwords but they are not working.
I've created the init file to reset password. Unfortunately, my passwords are not accepted, here is my log:
2018-02-16T10:12:22.962733Z 0 [Warning] [MY-010139] Changed limits: max_open_files: 5000 (requested 8161)
2018-02-16T10:12:22.962815Z 0 [Warning] [MY-010142] Changed limits: table_open_cache: 2419 (requested 4000)
2018-02-16T10:12:23.160066Z 0 [System] [MY-010116] /usr/sbin/mysqld (mysqld 8.0.4-rc-log) starting as process 20059 ...
2018-02-16T10:12:24.013727Z 0 [Warning] [MY-010068] CA certificate ca.pem is self signed.
2018-02-16T10:12:24.026122Z 0 [Warning] [MY-010319] Found invalid password for user: 'root@localhost'; Ignoring user
2018-02-16T10:12:24.043758Z 6 [Warning] [MY-010319] Found invalid password for user: 'root@localhost'; Ignoring user
2018-02-16T10:12:24.050668Z 0 [System] [MY-010931] /usr/sbin/mysqld: ready for connections. Version: '8.0.4-rc-log' socket: '/var/lib/mysql/mysql.sock' port: 3306 MySQL Community Server (GPL).
Here is my current init file content:
SET GLOBAL validate_password.policy = 'LOW';
UPDATE mysql.user
SET authentication_string = PASSWORD('new_password'), password_expired = 'N'
WHERE User = 'root' AND Host = 'localhost';
FLUSH PRIVILEGES;
I've tried so much different passwords, none worked. I've tried to create passwords longer than 16 characters with special characters and numbers, nothing. Any advices what I could do to reset the password and actually start using DB?
回答1:
I had the same problem. Looks like they changed the initial authentication steps with the new version. Instructions are given here. Basically:
$ sudo service mysqld start
$ sudo grep 'temporary password' /var/log/mysqld.log
(use that password in the following - or to log into mysql_secure_installation)
$ mysql -uroot -p
> ALTER USER 'root'@'localhost' IDENTIFIED BY 'newPasswd';
Note: they also switched from the validate_password "plugin" to a "component" - so if you don't need the levels of security they insist on and want a password you can remember, you'll have to run the following within mysql:
> UNINSTALL COMPONENT 'file://component_validate_password';
Edit: They've also changed the authentication plugin to support better encryption. If you're using Workbench or other add-ons and get an error along these lines
Authentication plugin 'caching_sha2_password' cannot be loaded:
/usr/local/mysql/lib/plugin/caching_sha2_password.so not found
Then use the following to adjust the user password:
> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'newPasswd';
You should probably also add (or uncomment if already there) the following line to /etc/my.cnf
default-authentication-plugin=mysql_native_password
回答2:
If you want execute mysql init file you need to pass --init-file option to mysqld executable when starting it.
You can initialize your MySQL Server instance with --initialize-insecure https://dev.mysql.com/doc/refman/8.0/en/server-options.html#option_mysqld_initialize-insecure to set empty password for root.
You can also start mysqld with --skip-grant-tables to connect to mysql without any authorization checks to reset root password. It is recommended to start with --skip-networking option and connect to mysql using unix sockets to minimize exposure of mysql server for other users.
回答3:
If you can log in to your MySQL server and you wanto to change your password by query you can do it by:
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
回答4:
If you have not reset your password yet, while enter the following command:
mysql_secure_installation
it will ask for the root password. Do you know what is the root password? Find it here:
cat /var/log/mysqld.log
Here you can find the default password for root. Then run the following command:
mysql_secure_installation
Then put that password. After that put a New password. A weak password will be allowed in mysql server 8. So try to put a password like hash password. Retype that password and done. :)
来源：https://stackoverflow.com/questions/48824572/i-installed-mysql-8-x-using-yum-but-i-cannot-find-or-reset-the-root-password