Chrome fails to serve from debugging port inside docker container

I have a very simple docker container that installs ‘google-chrome-stable’ by following these instructions.

Inside the container, I can’t start and access the debug server:

# start chrome in debug mode
$ google-chrome-stable --no-sandbox --remote-debugging-port=9222

# verify that I can reach the debugging server
$ curl 127.0.0.1:7222
curl: (7) Failed to connect to localhost port 7222: Connection refused

Outside the container (OSX 10.12.6), the same process works fine:

# start chrome in debug mode
$ chrome --no-sandbox --remote-debugging-port=9222

# verify that I can reach the debugging server
$ curl localhost:9222
curl localhost:9222


Inspectable pages
...

There must be something I’m missing because it seems like these are identical workflows even though the environments are different.

Can someone illuminate what’s going on here?