[Discuss] Ideas for solving a remove backup quandary

[Jeremy Kiffiak]

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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