Remote ssh tunnel in background or script?
kraduk at googlemail.com
Tue Nov 10 11:18:58 UTC 2009
2009/11/9 Kevin Kinsey <kdk at daleco.biz>
> Svante Kvarnstrom wrote:
>> Have you tried -f (for background) and -N for "Do not execute a remote
>> command"? See man 1 ssh for more details.
> Cheers for you!
> It was "-f" without "-N" that produced the error.
> I'm guessing I got down the manpage about as far as
> "-f" and didn't go any further. *beats head on desk*
> Thanks, Svante!
> For the archives:
> SMTP OVER SSH TUNNEL FREEBSD
> sudo ssh -f -N -L localname:24:remotename:52525 me at remotename
> When SMTP is listening on "remotename" port 52525. "sudo" is needed
> to open the tunnel on the "localname" side on port 24 (a privileged
> port). You could do this as "root" on the local side, but shouldn't
> connect *to* root on the remote computer.
> On Nov 9, 2009, at 7:30 PM, Kevin Kinsey wrote:
>>> sudo ssh -L thisbox:24:remotebox:52525 me at remotebox
>>> I've got Sendmail listening there on 52525, and it works
>>> fine; the local clients are told to connect to "thisbox"
>>> port 24. The only issue is that I have to run it from
>>> a terminal session. When I tried to bg the process ("cmdstring &")
>>> it doesn't work, exactly. I've gotten an error message
>>> at times*, and at other times I apparently get "thisbox"
>>> listening on port 24 but it's not an SMTP daemon that's
>>> I have a feeling it's cause I'm in csh, which is notorious
>>> for backgrounding issues. <?> At any rate, what I'd
>>> like to do is have a script set up the connection, or
>>> write some daemon that would monitor the connection and
>>> fix it if it gets reset. At any rate, if I could get this
>>> SSH process to detach from a terminal, it'd be great.
>>> Any suggestions?
>>> Kevin Kinsey
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if you put it on a port > 1024 instead of 24 you wont need to run it as root
so can drop the sudo bit
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