Q:

create interface to connect external server using php (and execute shell commands)

I have 4 servers for web, dns, mail and database. I wanna to create an interface to remotely connect those servers using server's IP (may be port) and username and password(and later, in next step execute linux/winsows commands such as shutdown/reset server, stop/start IIS, stop/start mail server, ...)
Is it possible or any link to help me?

A:

You can use ssh module as said by GeoPhoenix. You can try another method using curl. I assume you're using php, so consider following example,  
function check_dserver_process(){
    if(!$ch)
       $ch = curl_init();

        $options=array( CURLOPT_URL => "http://122.165.212.22:81/mysite/init.php",
                        CURLOPT_FRESH_CONNECT => 1,
                        CURLOPT_RETURNTRANSFER => 1, 
                        CURLOPT_FORBID_REUSE =>1,
                        CURLOPT_USERAGENT => "Mozilla/4.0 (compatible; MSIE 5.01;Windows NT 5.0)"
                     );

        curl_setopt_array($ch,$options);
        $result=curl_exec($ch);  
        $op=($result===false ? curl_error($ch) : $result);
        curl_close($ch);
        return $op;
}  

If you call above function it will fetches the output from init.php from the given url. so you can run your own commands from init.php using exec() function. Before you start the process in init.php make sure the request came from one of your ip. 

