docker - MySQL 报错：Access denied for user 'xxx'@'localhost'

Question

使用 MySQL 创建一个新的用户，理论上是这样的，
先用 root 用户登录，然后
CREATE USER ‘newuser’@‘localhost' IDENTIFIED BY '12345';
用 docker 搭建的开发环境，数据库主机的名字是 db 不是 localhost，
于是 CREATE USER ‘newuser’@‘db' IDENTIFIED BY '12345';

然后我登录遇到问题了：
mysql -u newuser -p
输入密码后提示
Access denied for user 'newuser'@'localhost' (using password: YES)

好像是主机名的问题，具体因为啥不太清楚，请教一下大家，谢谢

Answer 1

Try this one below!

mysql --host=db -u root -p 

Answer 2

First use the root account to check if newuser has permission to connect to localhost

Answer 3

localhost in mysql refers to the local machine, not the machine name

Answer 4

The problem was solved. I asked a master who is familiar with docker for advice:
It needs to be created like this:

CREATE USER 'newuser'@'%' IDENTIFIED BY '12345';

View users and hosts:
select host, user, password from mysql.user;

Return something like this:

host	user	password
%	root	*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B
%	app	*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1
%	newuser	*00A51F3F48415C7D4E8908980D443C29C69B60C9

3 rows in set (0.00 sec)