Mysql 5.7用户管理授权和远程访问

select version();
5.7.24

创建用户
create user 命令
create user ‘user’@‘localhost’ indentified by ‘password’

删除用户
delete from user(#mysql.user ) where user=‘name’
drop user ‘name’@’%’

重命名用户
rename user@host to newuser@host;
(rename 也可用来重命名table)

指定数据表授权
Grant privileges ON databasename.tablename TO ‘username’@‘host’
Grant INSERT,DELETE,UPDATE,SELECT ON db.table TO ‘user’@‘localhost’;
+如果所有权利 , Grant all on db.table to ‘user’@‘localhost’
+如果数据库所有表 Grant all on db.* to ‘user’@‘localhost’
+如果所有数据库 Grant all on . to ‘user’@‘localhost’
phpmyadmin7.2 远程登录会遇到权限不足问题，这时候Grant命令就有用了。

取消权限授权
revoke insert,delete on . from user@host
revoke all on . from user@host

修改密码
set password for ‘username’@‘localhost’ = PASSWORD(‘newpassword’)
或当前用户
set password = password(‘something’)
update user set authentication_string=password(‘some’) where user = ‘name’

查看用户权限
show grants;
show grants fro usr@host

远程访问
1检查mysql访问端口,默认是3306 .
配置文件 /etc/mysql/mysql.conf.d/mysqld.cnf
[mysqld]字段下 port = 3306
2 如果要在互联网访问,需要屏蔽本机监听
#bind-address = 127.0.0.1
3 对需要访问的用户,开启主机限制
在mysql的user表中,将需使用用户的host 为%
update user set host = ’%’ where user = ’root’;

权限修改生效
flush privileges;
重启服务
systemctl restart mysql

(此版本(5.7.24)授权表共有4个表：user、db、tables_priv和columns_priv。)