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linuxunixsshrsyncssh-tunnel

SSH tunneling to transfer the data from one data center to another from middle machine

How to create SSH tunneling for below scenario.

I have 3 machines..

A. Data Center A VM.
B. Machine at work (middle man).
C. Data Center C VM.

So I can SSH from B -> A and from B -> C, but not from A -> C and C->A.

Is there a way to setup an SSH tunnel, so that I can transfer the data from A(Data Center A) to C (Data Center C) using Machine B. I want to use rsync to transfer the data, please let me know after tunneling how can I use rsync?

In mentioned reply they have a access from A->B-> C. it is possible using that. In My question I have a access from B->A and B->C and I want to copy data from A->C

Solution

  • I found the solution, here are the details

    The solution is divided in two parts:

    1. Following command will create a tunnel between source and destination machine. To debug the connection, break this into two parts and add verbose status:

      Run this command on Middle Machine [B. Machine at work (middle man)]

      $ ssh -v -R 50000:(Ip address of Data Center C VM):22 (IP address of Data Center A VM) Example: ssh -v -R 50000:192.168.1.25:22 192.168.1.36

    Note: To get this working you need to have ssh keys set up correctly between the two remote hosts [Data Center A VM (Source) and Data Center C VM (Destination)], with the private key on source machine and the public key on destination machine.

    1. If 1st soltion works, then you'll get a shell access on Source machine (Data Center A VM). Now try the rsync command from Data Center A VM.

      It is recommend to do this in a different terminal, so the verbose ssh info doesn't get mixed together with the rsync status information.

      $ rsync -e "ssh -p 50000" -vuar /opt/source_path localhost:/opt/destination_path