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spinlock's questions

Martin Hope
spinlock
Asked: 2012-03-08 10:57:14 +0800 CST
  • 2

I'm trying to work with facebooks real-time updates but I'm having trouble giving facebook a callback address that they can use. My dev machine is behind a firewall so I want to use an ec2 instance to forward traffic to the dev machine.

Progress so far:

  • App is up and running on localhost:

    http://0.0.0.0:5000

  • Created Ubuntu 10.11 instance on ec2

  • Authorize ports on ec2 instance

    localhost$ec2-authorize default -p 5000 
localhost$ec2-authorize default -p 22

  • Configure sshd on ec2

    localhost$ssh -i ubuntu@ec2_public_dns -i ~/.ssh/ec2_key_pair.pem
ec2$sudo echo "AllowTcpForwarding yes" >> /etc/ssh/sshd_config
ec2$sudo echo "GatewayPorts yes" >> /etc/ssh/sshd_config
ec2$sudo /ect/init.d/ssh restart

  • Start ssh tunnel

    localhost$ssh -R0.0.0.0:5000:localhost:5000 ubuntu@ec2_public_dns -i ~/.ssh/ec2_key_pair.pem

  • Test it in the browser

    http://ec2_public_dns:5000

But nothing happens :( The request just times out. Any ideas what I'm doing wrong?

Thanks!

PROGRESS

OK, I'm making some progress hitting the web server on my local machine. After I ssh in, I can get the home page from the prompt using curl:

localhost$ssh -R0.0.0.0:5000:localhost:5000 ubuntu@ec2_public_dns -i ~/.ssh/ec2_key_pair.pem
ec2$curl localhost:5000
<!DOCTYPE html>
<html>
...
</html>

It even works with the ec2_public_dns from the ec2:

ec2$curl ec2-23-20-132-36.compute-1.amazonaws.com:5000

<!DOCTYPE html>
<html>
...
</html>

but, it can't connect from my local development machine:

localhost$curl ec2-23-20-132-36.compute-1.amazonaws.com:5000
curl: (7) couldn't connect to host
amazon-ec2 ssh ruby-on-rails tunneling
Martin Hope
spinlock
Asked: 2012-03-03 11:12:09 +0800 CST
  • 4

I'm new to screen and I'm trying to figure out how to detach from a session and reattach later. So far I've tried:

$screen
C-a z (within screen to detach)
$screen -r

So far so good but when I C-a z to detach again, I see 2 screen processes running:

$ps
  PID TTY           TIME CMD
33145 ttys000    0:00.06 -bash
33176 ttys000    0:00.01 screen
33407 ttys000    0:00.01 screen -r

If I detach and reattach again I get another screen process, etc...

So, how can I reattach to the screen session without spawning a new process?

Thanks!

mac-osx gnu-screen