docker - cannot connect to exposed port on container using host ip

Question

Apologies if this obvious - I can't seem to figure this out. I have a docker container with ports 8112 exposed to the host. Docker ps shows: ' 0.0.0.0:8112->8112/tcp '

From the host, I can successfully connect to the port using localhost: ' curl localhost:8112 **This works '

From the host or remote machine, I cannot connect via ip: ' curl 192.168.0.5:8112 **This fails - just hangs and eventually timeouts '

I'm not sure how to diagnose from here - any help would be greatly appreciated!

Answer 1

This is likely due to known limitations of Docker networking.

From the link: "Per-container IP addressing is not possible"

Link is for Mac, as that is what I use, but I think there may be a similar limitation with Docker for Windows.

This is likely why you are able to access the container from localhost, but not by its IP.

EDIT: This all applies to connecting to the container from the host, if you want to connect to it remotely there are a bunch of other factors like firewalls that have nothing to do with Docker and might prevent you from accessing.