Using ssh and nc to attach to a remote process

xeon123 · 01-09-2012, 11:01 AM

Hi,

I want to do debug remotely java code, but, to connect to the remote JVM, I've to pass 3 proxys.

Where's the architecture

MYCOMPUTER --> Proxy1 --> Proxy2 --> JAVAMACHINE --> PROCESS:50030

From MYCOMPUTER; I've to pass Proxy1 and Proxy2 to go to the machine where a java process is running. The java process called PROCESS is running in the JAVAMACHINE node.And I want to attach to the port 50030.

I know that configuring the .ssh/config file is the way to go. I've this configuration, but it's not working in the way that I want:

Code:

Host *.ra
       User USER
       ProxyCommand ssh USER@frontend1 "nc -q 10 \$(basename %h .ra) %p"
       StrictHostKeyChecking no
       ServerAliveInterval 120

If I do
[code]
ssh USER@frontend2.ra
[code]

I stop in the frontend2 machine, but I'm not attaching to the PROCESS:50030

How can I set the .ssh/config file to attach to a remote process?

kbp · 01-09-2012, 07:01 PM

It might be simpler to just set up a ssh tunnel to the target server, then you can just connect to localhost:50030 and it will get passed through to the target.

xeon123 · 01-10-2012, 04:41 AM

I've found the solution here:
http://superuser.com/questions/96489...-multiple-hops

Although, I want something little different.
LOCALHOST --> FRONTEND1 --> FRONTEND2 --> MACHINE:9009

To go to the host MACHINE, I've to pass 2 hosts from the localhost. I don't know how to set a tunnel with 2 hosts in the middle. Any help?

unSpawn · 01-11-2012, 10:00 AM

Quote:

Originally Posted by xeon123

I don't know how to set a tunnel with 2 hosts in the middle.

I told you last year: http://www.linuxquestions.org/questi...9/#post4287985

zhjim · 01-11-2012, 05:34 PM

Unspawn you should be nominated for the "moderator of the year" full stop

xeon123 · 01-12-2012, 12:50 AM

I'll try this configuration with 2 frontends in the middle, and not just one. I didn't remember that post.