Re: SSH

[Krister Bruhwel <bruhwel jlab org>]

Thanks much,  ill give it a try.

Thanks agian,
Krister

On Fri, 1 Jun 2001, Cameron Simpson wrote:

> On Thu, May 31, 2001 at 03:51:55PM -0400, Krister Bruhwel <bruhwel jlab org> wrote:
> | Does anyone know how to scp thru a machine.  I can use "ssh -t mach1 ssh
> | mach2"  to ssh thru a machine.  I would like to do something like that
> | with scp.  
> | If another newsgroup would be better, please tell of it.
> 
> Short answer: to can't do it like the ssh line you describe.
> Middle anser: you can half do it.
> Cunning answer: you can do it in full with a port forward (I do this at home).
> 	        details after the "Middle Answer".
> 
> Middle Answer
> =============
> 
> This will do it:
> 
> 	ssh mach1 ssh mach2 cat file >local-file
> 
> You could write a script you do it, too, but it will be a real pain to
> support all the frills of a proper scp (-r -p etc etc).
> 
> If you have to copy more than a single file you're best using an archive
> program like tar or a tool like rsync. You can then:
> 
> 	ssh mach1 ssh mach2 tar cf - lots-of-stuff | tar xvf -
> 
> or
> 	tar cf - local-stuff | ssh mach1 ssh mach2 tar xvf -
> 
> Cunning Answer
> ==============
> 
> Arrange a stable ssh connection to mach1 with a port forward to mach2:
> 
> 	ssh -f -L 2022:mach2:22 mach1 'while sleep 60; do :; done'
> 
> Make a Host record in your ~/.ssh/config:
> 
> 	Host mach2viaMach1
> 		Hostname	mach1
> 		Port		2022
> 
> Then you can go
> 
> 	ssh mach2viaMach1
> 
> or
> 
> 	scp mach2viaMach1:file blah
> 
> Effectively you're letting mach2's sshd listen for connections on port 2022
> on your local machine.
> 
> This works really well.
>