Rumah > Artikel > pangkalan data > 详解如何通过SSH通道来访问MySQL
许多时候当要使用Mysql时,会遇到如下情况:
1. 信息比较重要,希望通信被加密。
2. 一些端口,比如3306端口,被路由器禁用。
对第一个问题的一个比较直接的解决办法就是更改mysql的代码,或者是使用一些证书,不过这种办法显然不是很简单。
相关学习视频教程推荐:mysql视频教程
这里要介绍另外一种方法,就是利用SSH通道来连接远程的Mysql,方法相当简单。
一、建立SSH通道
只需要在本地键入如下命令:
ssh -fNg -L 3307:127.0.0.1:3306 myuser@remotehost.com The command tells ssh to log in to remotehost.com as myuser, go into the background (-f) and not execute any remote command (-N), and set up port-forwarding (-L localport:localhost:remoteport ). In this case, we forward port 3307 on localhost to port 3306 on remotehost.com.
二、连接Mysql
现在,你就可以通过本地连接远程的数据库了,就像访问本地的数据库一样。
mysql -h 127.0.0.1 -P 3307 -u dbuser -p db The command tells the local MySQL client to connect to localhost port 3307 (which is forwarded via ssh to remotehost.com:3306). The exchange of data between client and server is now sent over the encrypted ssh connection.
或者用Mysql Query Brower来访问Client的3307端口。
类似的,用PHP访问:
<?php $smysql = mysql_connect( "127.0.0.1:3307", "dbuser", "PASS" ); mysql_select_db( "db", $smysql ); ?> Making It A Daemon A quick and dirty way to make sure the connection runs on startup and respawns on failure is to add it to /etc/inittab and have the init process (the, uh, kernel) keep it going. Add the following to /etc/inittab on each client: sm:345:respawn:/usr/bin/ssh -Ng -L 3307:127.0.0.1:3306 myuser@remotehost.com And that should be all you need to do. Send init the HUP signal ( kill -HUP 1 ) to make it reload the configuration. To turn it off, comment out the line and HUP init again.
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