Re: starting remote server(s) with ssh

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Date: Sun, 22 Aug 2004 09:36:51 +0000
To: secureshell@securityfocus.com

You need to learn more about Unix shell and process control.
ssh -n -x -l user host "nohup start_server.sh < /dev/null > /dev/null 2>&1 &"

Either the server needs to properly run itself as a daemon. Which is
to fork() itself
into the background, close all TTYs (stdin, stdout, stderr), and make
itself it's own
process group leader. A process called "daemonizing".

Or, you have to do what you can via the shell. "nohup" turns of the
HUP signal, so
when the shell exits and sends the HUP signal to all child processes, the server
process will ignore it. Redirect stdin, stdout, stderr to/from
/dev/null, kind of
disassociates it from the terminal. Then put it in the background, so the shell
can return.

On Fri, 20 Aug 2004 21:35:54 -0700 (PDT), k l <yoda_2732002@yahoo.com> wrote:
> Hi,
>
> How can I start a server on a remote
> host and disconnect while
> leaving the server running on the remote
> machine?
>
> I am trying sth like:
> ssh -n -x -l user host start_server.sh
> (I've used ssh-agent and ssh-add to enter
> my passphrase)
>
> The problem is that this keeps the ssh connection
> open(with or without output from the remote server).
> I would like to use this in a script which goes
> through a list of hosts and starts a server on
> each machine. I do not want to keep the ssh
> connection open or in the background as the list
> of remote hosts is fairly large.
> I am using OpenSSH_3.6.1p2 on Enterprise RedHat Linux
> v.3. This is probably a basic question that may
> have been covered on the list but I could not find
> an answer in the archives.
>
> Thank you for your help,
>
> kamen
>
>
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-- 
END OF LINE
       -MCP

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