I am trying to access a service at a specific port on the host from inside a docker container. But all I am getting is Connection refused. For debugging purposes, I create a dummy listening port via nc:
host$ nc -l 888 ...
And in the container I do
container$ ping 172.16.238.1 PING 172.16.238.1 (172.16.238.1) 56(84) bytes of data. 64 bytes from 172.16.238.1: icmp_seq=1 ttl=64 time=0.071 ms container$ nc -zv 172.16.238.1 888 172.16.238.1: inverse host lookup failed: Unknown host (UNKNOWN) [172.16.238.1] 888 (?) : Connection refused
I am not irritated by the failing inverse host lookup, as explained at https://stackoverflow.com/questions/48779583/nc-command-inverse-host-lookup-failed-unknown-host .
Some similar questions pointed out that the binding address must match, but that seems to be fine:
host$ lsof -i -P -n | grep LISTEN nc 13405 richardkiefer 3u IPv4 0x69a18bda503dc55d 0t0 TCP *:888 (LISTEN)
I know that you can assign containers the host's network, which seems to fix this in other similar questions, but for security reasons I like to avoid that.
My motivation are testing and development purposes, where I would like to reach an ssh tunneld port on my host machine (ultimately reaching a remote host), so I am aware that I can link containers running different services as adviced in connecting from docker container to docker host and it does not solve my use case.
The host is macos and the firewall according to system settings is turned off.
Any suggestions? Many thanks in advance!