创建用户
CREATE USER 'keystone'@'localhost' IDENTIFIED BY 'ck123456';
//用户名 keystone 密码ck123456
mysql -h localhost -ukeystone -p
//keystone登录数据库
grant all on *.* to k2@localhost;
//授权

CREATE DATABASE keystone;

select current_user;

grant all on *.* to 'firstuser'@'localhost';

update user set host='%' where user='root';

grant all privileges on test.* to root@'%'