MySQL said: Authentication plugin 'caching_sha2_password' cannot be loaded:解决方案

问题表现：

1、命令行登录mysql：

#登录mysql，回车输入密码

$mysql -u root -p

2、修改账户密码加密规则并更新用户密码：

#修改加密规则

>ALTER USER 'root'@'localhost' IDENTIFIED BY '123456' PASSWORD EXPIRE NEVER;

#更新用户的密码

>ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

3、刷新权限并重置密码

#刷新权限

>FLUSH PRIVILEGES;

4、单独重置密码

>alter user 'root'@'localhost' identified by '123456';

再次登录，成功。