https://computer-science-student.tistory.com/514

mysql -u root -p
use mysql;
select user, host from user;

create user '사용자'@'host' identified by '비밀번호';
host옵션 -> localhost 내부접근 , % 외부접근, xxx.xxx.% 특정ip대역
grant all privileges on DB이름.* to '사용자'@'host';
flush privileges;