1. 查看临时密码：

[root@god ~]# grep password /var/log/mysqld.log 
2020-09-11T10:58:46.152697Z 1 [Note] A temporary password is generated for root@localhost: p(-Jp)6d!4RW

2. 登录mysql(复制刚才的临时密码)

[root@xuegod69 ~]# mysql -uroot -p
Enter password: 

3. 修改mysql密码策略

mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.00 sec)

mysql>  set global validate_password_length=6;
Query OK, 0 rows affected (0.00 sec)

4. 修改mysql密码

mysql> SET PASSWORD FOR root@localhost=PASSWORD(‘123456‘);
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql5.7密码修改