mysql创建远程用户并授权

先用ssh登录远程服务器，用root连上数据库看看情况；

mysql> select Host,User,Password from mysql.user;
+----------------+------------------+-------------------------------------------+
| Host           | User             | Password                                  |
+----------------+------------------+-------------------------------------------+
| localhost      | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| iz94926clkiz   | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| 127.0.0.1      | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| ::1            | root             | *836E233974EBE6EA32F95F890A91363F8427F78B |
| localhost      | debian-sys-maint | *1460ED3535ABDBB887F9E5F57F40A2354610CDF3 |
+----------------+------------------+-------------------------------------------+
rows in set (0.00 sec)

一共有5个mysql账号，Host列可以看出来，这些账号都只支持服务器本机连接，现在我们来创建一个远程用户；

+----------------+------------------+-------------------------------------------+
| Host           | User             | Password                                  |
+----------------+------------------+-------------------------------------------+
| localhost      | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| iz949s6clkiz   | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| 127.0.0.1      | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| ::1            | root             | *836E283974EBE6EA32F95F890A91363F8427F78B |
| localhost      | debian-sys-maint | *1460ED35E5ABDBB887F9E5F57F40A2354610CDF3 |
| %              | test             | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+----------------+------------------+-------------------------------------------+
rows in set (0.00 sec)
create user test identified by '123456';

创建完成了，在程序里面连接发现还是没有权限，刚才我们只是创建了用户，还没有对这个用户分配权限；

grant all privileges on *.* to 'test'@'%'identified by '123456' with grant option;

all代表接受所有操作，比如 select,insert,delete....; . 代表所有库下面的所有表;% 代表这个用户允许从任何地方登录；为了安全期间，这个%可以替换为你允许的ip地址；

然后刷新mysql用户权限相关表；

flush privileges ;

我以为就此收工了，等等，程序怎么还是连不上去，还是 access deny ;

难道端口不是3306吗，打开 mysql配置文件，是默认的3306，接着往下面看，发现一个关键地方；

bind-address = 127.0.0.1

原来这里mysql默认绑定了本地ip，不接受其他来源；注释掉，重启mysql 一切OK；

还有两个常用操作；

修改指定用户密码

update mysql.user set password=password('新密码') where User="test" and Host="localhost";

删除用户

delete from user where User='test' and Host='localhost';