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忘记了root用户密码， 首先使用如下重启mysqld服务
 
[root@mysql8-01 ~]# systemctl set-environment MYSQLD_OPTS="–skip-grant-tables"
 
[root@mysql8-01 ~]# systemctl stop mysqld
 
[root@mysql8-01 ~]# systemctl start mysqld
 
如果需要使用简单密码，需要修改系统参数:
 
set global validate_password.policy=0;
 
set global validate_password.length=4;
 
接下来登录:
 
[root@mysql8-01 ~]# mysql
 
Welcome to the MySQL monitor.  Commands end with ; or \g.
 
Your MySQL connection id is 7
 
Server version: 8.0.14 MySQL Community Server – GPL
 
Copyright (c) 2000, 2019, 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
 
 
Query OK, 0 rows affected (0.00 sec)
 
mysql> flush privileges;
 
Query OK, 0 rows affected (0.00 sec)
 
mysql>
 
mysql> exit
 
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