1.修改MySQL的配置文件（默认为/etc/my.cnf）,在[mysqld]下添加一行

skip-grant-tables

2、保存配置文件后，重启MySQL服务

service mysqld restart

3、再次进入MySQL命令行，输入密码时直接回车，就会进入MySQL数据库了。

mysql -uroot -p

 4，改密码

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123';

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第4步报错

ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option

1.先执行

flush privileges;

2.再执行

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123';

第4步报错

ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'

看一下

ALTER USER 'root'@'%' IDENTIFIED WITH mysql_native_password BY '123';

是否写成了

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123';