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ssh from server 1 over server 2 to server 3

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# 1  
Old 11-16-2010
ssh from server 1 over server 2 to server 3
in fact i want to do something like

ssh serv01 "gunzip < zipped.tar.file.tar.gz" | ssh serv03 "tar xvfn -"

while standing on server 2

The point is that server 1 and 3 are on different networks and can contact each other directly and that I do not have write permissons on server 2

Server 2 can connect to both servers

Anyone an idea how to tackle this one ?

---------- Post updated at 01:25 PM ---------- Previous update was at 01:25 PM ----------

oh by the way, this constuctions just keeps hanging
# 2  
Old 11-16-2010
Trust relationship between the servers?
# 3  
Old 11-16-2010
the servers are on different networks that's the reason for this setup.
s1 is on an internal network and s3 is behind a firewall
the only way to go from 1 to 3 is over 2
but, as already said, I can NOT write on 2
# 4  
Old 11-16-2010
Hi, maybe you could tunnel ssh from serv01 to serv03 via serv02.

This is the script to run on serv01 to do the job.

bash code:
  1. # Open ssh tunnel localhost:1234 to serv03 via serv02 . . .
  2. ssh -NfL 1234:serv03:22 serv02
  3.  
  4. # Check if it's working . . .
  5. ssh -p 1234 localhost "uname"
  6.  
  7. # Now do the job
  8. gunzip <zipped.tar.file.tar.gz | ssh -p 1234 localhost "tar xvfn  -"
Last edited by Chirel; 11-16-2010 at 08:04 PM..
This User Gave Thanks to Chirel For This Post:
plelie2
# 5  
Old 11-17-2010
ok, great this works fine
can you give some more explanation so I understand better what I'm doing ?
what is 1234 ? can I personalize this ?
what is 22 ?

---------- Post updated at 09:57 AM ---------- Previous update was at 09:53 AM ----------

and, how long will this tunnel last ?
untill I quit my session or do I have to kill it myself ?
# 6  
Old 11-17-2010
Sure,

  • 1234 is a random port i choosed you can choose any other of your choice.
  • 22 is the standard ssh port so the communication between serv02 => serv03 use the ssh port, this is a choice because we want to connect to the ssh deamon on serv03.
  • The tunnel will last as long as the process is running, you have to kill it.
There is a little tricks to know. This kind of ssh usage will add a localhost entry to the .ssh/know_hosts file. You should have to remove this line with localhost as the first step, unless you using the ssh tunnel always to talk with the same host.
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