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首先强调的是两个版本，5版本和8版本问题反馈不一样

Linux系统部署mysql8.4版本

MySQL官网地址写的很清楚了，不多介绍

直接进入主题，恶心了我三个多小时的问题，翻阅大量国内外资料，结果并不是个多么难得问题，心态崩了
赶紧记录。。

mysql5.x版本授权

grant all privileges on *.* to testuser@“192.168.1.100” identified by "123456" ;　　//设置用户testuser，只能在客户端IP为192.168.1.100上才能远程访问mysql ；

flush privileges;

再去连接就可以了

mysql8.x

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;

GRANT ALL PRIVILEGES ON *.* TO 'root'@'your_remote_ip' WITH GRANT OPTION;

来看报错

mysql> grant all privileges on *.* to "root"@"%" identified by "Abc#12341" ;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by "Abc#12341"' at line 1

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
ERROR 1410 (42000): You are not allowed to create a user with GRANT

最后搜到的解决方式就是直接update user去更改，
据说是不允许通过root@‘%’,这种写法，
必须写host才可以