`coder_app` resource doesn't proxy non localhost addresses

[bartonip]

I have PGAdmin running in a separate container with the hostname pgadmin.

I have specified a coder_app resource like this:

resource "coder_app" "pgadmin" {
  agent_id = coder_agent.main.id
  name     = "PGAdmin"
  url      = "http://pgadmin/"
  icon     = "icons/pgadmin.svg"
  relative_path = true
}

However I just get the following error message:

PGAdmin is offline!
read tcp [ipv6-here]:44715: connection reset by peer

• It works when the url is localhost or some address that is pointed to 127.0.0.1 in /etc/hosts
• Inside the container if i curl http://pgadmin/ it works

Any help would be much appreciated

[bartonip]

@kylecarbs Not to rush you mate, but just wondering what the ETA is on this, as we have a project that is stuck pending this change. Just need to know if I should expend the hours putting in a workaround or not.

[kylecarbs]

@bartonip there isn't an amazing way for us to customize the host in our current implementation since it transparently dials the agent IP and forwards it to localhost.

I'd recommend finding a workaround, but we'll support this eventually (tentatively, I'll say in the next six weeks).

[github-actions]

This issue is becoming stale. In order to keep the tracker readable and actionable, I'm going close to this issue in 7 days if there isn't more activity.

[kylecarbs]

I investigated this a bit, and it's slightly more involved than I'd like unfortunately...

Our current implementation uses Wireguard's DialContext, which virtualizes the networking, removing the host in favor of the IP. We'd have to fix this by creating a new port listener that forwards DialContext requests with the specified host and port. It's not overly involved, just seems potentially a bit bug-prone.

[github-actions]

This issue is becoming stale. In order to keep the tracker readable and actionable, I'm going close to this issue in 7 days if there isn't more activity.

[cdrx]

Workaround

You can use socat to listen on localhost inside the workspace and proxy traffic to the non-localhost address. Put this at the end of your startup script:

nohup socat tcp-l:YYYY,fork,reuseaddr tcp:XXXX:YYYY &>/dev/null &

replace XXXX with the hostname you want to use (eg: pgadmin) and YYYY with the port number.

Then you can configure the coder_app to use http://localhost:YYYY and socat will proxy the traffic to the correct endpoint.