[Discuss] Ideas for solving a remove backup quandary

[Chris Hennessy]

You almost had it:)
ssh -P 10022 -C -f -N -L 127.0.0.1:10033:192.168.10.150:22<username>@remotegw1

Your script actually didn't hang... the tunnel gets opened and stays in the
foreground.

The -f in the command pushes it into the background.  You should be able to
run ssh against that 10033 port now.

I tried the above on Mandriva 2008.1.

have fun.

Chris

On Fri, May 9, 2008 at 3:25 PM, Jeremy Kiffiak <jeremy at truesolutions.ca>
wrote:

> On 9-May-08, at 3:13 PM, Alan W. Irwin wrote:
>
>  On 2008-05-09 14:46-0700 Jeremy Kiffiak wrote:
>>
>>  I would like to do something similar with the new backup system as well.
>>>  I thought to include an SSH tunnel at the beginning of my script but the
>>> script hangs on that line.  The new (borked) script follows.  I have added a
>>> few "echo" commands to try and see where the script was hanging.  I am using
>>> port 10022 for 2 reasons.  First it is non-standard so hopefully less
>>> script-kiddy port scans will find it.  Second I have multiple boxes running
>>> SSH on the REMOTE network.  On the remote router port 10022 forwards to port
>>> 22 on REMOTE-GW(IP1).
>>>
>>> #!/bin/sh
>>> echo "Creating remote tunnel . . ."
>>> ssh -p 10022 -C -N <username>@REMOTE1   \
>>>        -L localhost:18128:10.10.8.128:22 &&
>>> echo "Tunnel created successfully!"
>>> echo "Starting backup process"
>>> scp -p -P 18128 <username>@localhost:~/
>>> echo "File(s) backed up!"
>>>
>>> How can I create a BASH script that initially creates an SSH tunnel that
>>> rsync or scp can use to access the machine behind the gateway VM?
>>>
>>
>> Here is some general advice about debugging scripts.
>>
>> To see all the commands that your bash script runs, use the -x option,
>> e.g.,
>>
>> bash -x ./dodgy_script.sh
>>
>
>
> Thank you Alan!  I did not know that.  Much appreciated.  :-)
>
> Jeremy
>
>
>
>
>>
>> Then if/when it hangs on some command, you should normally be able to
>> figure
>> out what is wrong with the command simply by looking at it. Alternatively
>> if
>> the command looks okay, you can run that exact command by hand to verify
>> the
>> problem and continue the debugging directly without bash obfuscating the
>> problem.
>>
>> Alan
>> __________________________
>> Alan W. Irwin
>>
>> Astronomical research affiliation with Department of Physics and
>> Astronomy,
>> University of Victoria (astrowww.phys.uvic.ca).
>>
>> Programming affiliations with the FreeEOS equation-of-state implementation
>> for stellar interiors (freeeos.sf.net); PLplot scientific plotting
>> software
>> package (plplot.org); the libLASi project (unifont.org/lasi); the Loads
>> of
>> Linux Links project (loll.sf.net); and the Linux Brochure Project
>> (lbproject.sf.net).
>> __________________________
>>
>> Linux-powered Science
>> __________________________
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>>
>
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