多实例 Unable to load authentication plugin 'caching_sha2_password'.错误解决：

多实例：
mysqld install MySQL80-3316 --defaults-file="D:softwaremysql-8.0.16-winx64my.ini
初始化后会生成data文件和一个密码
打开注册表，HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesMySQL80-3316，把里面的ImagePath改为以下参数：
"D:softwaremysql-8.0.16-winx64inmysqld" --defaults-file=D:softwaremysql-8.0.16-winx64my.ini MySQL80-3307
启动服务：net start MySQL80-3307
修改密码：ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
刷新权限：flush privileges;

5.X版本是：default_authentication_plugin=mysql_native_password
8.x版本就是：default_authentication_plugin=caching_sha2_password
输入如下代码：(password换成相应密码)
ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

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

FLUSH PRIVILEGES;

alter user 'root'@'localhost' identified by 'password';
参考博客：https://www.cnblogs.com/wanguncle/p/11432868.html