mysql 8.0忘记root密码

1、修改参数文件添加以下内容
skip-grant-tables

2、关闭数据库
[root@node01 ~]# /etc/init.d/mysqld8 stop
Shutting down MySQL. SUCCESS!

3、重启数据库
[root@node01 ~]# /etc/init.d/mysqld8 start
Starting MySQL.. SUCCESS!

4、修改用户密码为空
mysql> update mysql.user set authentication_string='' where user='root' and host='localhost';
Query OK, 1 row affected (0.01 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> flush privileges;
Query OK, 0 rows affected (0.02 sec)

5、关闭数据库
[root@node01 ~]# /etc/init.d/mysqld8 stop
Shutting down MySQL. SUCCESS!

6、去掉参数文件中以下内容
skip-grant-tables

7、启动数据库
[root@node01 ~]# /etc/init.d/mysqld8 start
Starting MySQL.. SUCCESS!

8、使用空密码登录数据库
[root@node01 ~]# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, 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>

9、修改用户密码
mysql> alter user 'root'@'localhost' identified by 'mysql';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

10、使用新密码登录数据库
[root@node01 ~]# mysql -uroot -pmysql
mysql: [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 9
Server version: 8.0.22 MySQL Community Server - GPL

Copyright (c) 2000, 2020, 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>