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From: "J.O. Aho" <user@example.net>
Newsgroups: comp.lang.php
Subject: Re: problems with exec()
Date: Wed, 18 Apr 2012 18:02:11 +0200
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Une Bévue wrote:
> Le 16/04/2012 19:29, J.O. Aho a écrit :
>> I suspect it could have the same issue, try to use shell_exec and let us
>> know if it works.
>
> Unfortunately, not.
> i suspect because the line :
>
> $cmd = ssh -L 63333:localhost:5432 -f yt@iMac -N
>
> is without password for the user 'yt' not for php being of user 'www_data' on
> Ubuntu.
>
> Nevertheless i got that pgsql db working remotly after editing pg_hba.conf.

Otherwise, you can copy the public key to the www-data users ~/.ssh and the 
ssh would have worked. Of course you could have setup a cron job instead which 
would recreated the tunnel each time it went down.
Of course those two solutions aren't as good as using the proper method.

-- 

   //Aho