Let's assume the following hosts:
- localhost : my laptop
- remoteserver : a server with a public IP which runs a SSH server.
- private.remoteserver : a server with a private IP which is only accessible from remoteserver.
I don't have sudo access to remoteserver, so I can't make changes with the root user.
The question is: Is it possible to access a port on private.remoteserver from remoteserver, in a single command?
I've played around a bit with ssh tunnels without luck. It would like to create an SSH alias to private.remoteserver as described in this article.
For example, I'd like to run from localhost:
curl http://private.remoteserver:8080/
to connect to port 8080 on private.remoteserver. Is this possible?
Answer
You haven't show us what you've tried so far, but something as simple as this should work:
ssh -L 8080:private.remoteserver:8080 remoteserver
Which would then let you run:
curl http://localhost:8080/
...which due to the port forwarding we just set up would actually connect to port 8080 on private.remoteserver.
If you want to be able to directly access http://private.remoteserver:8080/ from your client, you'll need to (a) set up some sort of proxy and (b) configure curl (or other software) to use the proxy. You can set up a SOCKS5 proxy with ssh using the -D option:
ssh -D 1080 remoteserver
And then you can:
curl --socks5-hostname http://private.remoteserver:8080/
Most web browsers (Firefox, Chrome) can also be configured to operate with a SOCKS5 proxy. If you search for "ssh dynamic forwarding" you'll find lots of good documentation, including this article from Ubuntu.
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