node --inspect devtoolsFrontendUrl using docker container IP

[mrguiman]

Version: v7.10.0
Platform: Linux fad72c3b2219 4.9.27-moby #1 SMP Thu May 11 04:01:18 UTC 2017 x86_64 GNU/Linux

Hi,

Running node 7.10.0 on a Docker Container, version: 17.03.1-ce-mac12 (17661), channel: stable.

For development purposes, I'm running node with --inspect with the following command:
./node_modules/.bin/nodemon --inspect=0.0.0.0:9229 index.js

Console output following this is:
chrome-devtools://devtools/bundled/inspector.html?experiments=true&v8only=true&ws=0.0.0.0:9229/79ee5f22-17fa-4878-baf5-1aed2b8ca12b
This works fine and lets me inspect and drop breakpoints inside my code.

However, I'm trying to use NIM to automatically pickup and open the new devtools url when my code changes.
NIM takes the devtoolsFrontendUrl from http://localhost:9229/json, which in this current case is:
chrome-devtools://devtools/bundled/inspector.html?experiments=true&v8only=true&ws=172.18.0.2:9229/79ee5f22-17fa-4878-baf5-1aed2b8ca12b
This does not work: I can't inspect my code through this url.

Essentially, devToolsFrontendUrl spits out my container's IP whereas the console log correctly uses the 0.0.0.0 IP that I provided to --inspect
I'm forced to change the ip to 0.0.0.0 to make it work.

Any idea why it behaves that way, and what I can do to automatically pickup the correct address ?

Thanks

[mrguiman]

Bumping this with my experiments with Node 8

So things are a little different this time around since node 8 does not spit out the devtoolFrontendUrl in the console, the issue however is still the same, the url uses the docker container IP, which does not work. Replacing the container ip with localhost (or 0.0.0.0 depending on the host' system) does work.

I've created a small repository and a docker image to illustrate the issue

https://github.com/MrGuiMan/docker-node-inspector-test
https://hub.docker.com/r/mrguiman/docker-node-inspector/

[Trott]

Is this still an issue in Node.js 10.0.0?

[mrguiman]

@Trott
Confirming this works on Node 10.0.0, url picked up by NiM now looks like:

chrome-devtools://devtools/bundled/inspector.html?experiments=true&v8only=true&ws=localhost:9229/d2041836-cda3-43b2-9562-256c6a57f0b0

[TimothyGu]

Fixed in #19664, probably.