Exposing port on host machine to docker container

ExposeHostPort.md

The vice versa can easily be done by including -p flag. But the way to expose ports of host machine to a docker container is bit convoluted, but can be done.

The steps are:

1. Create an alias for the ip you want to use.

sudo ifconfig lo0 alias 172.16.123.1

2. add the flag to docker:

docker run <image> --add-host=docker.local:172.16.123.1

Or

add it in docker-compose as:

services:
  service1:
    extra_hosts:
      - "docker.local:172.16.123.1"

3. Use docker.local as host in the container.