Accessing localhost from a Docker Container using native Docker for Mac

Ever had a need to access something from within a Docker container that runs on the host system?

When using native Docker on OSX you have bad luck. When configuring a container and pointing that to localhost will result in the fact the your software will be targeted at the localhost of the docker container.

A solution for this isto define a new local loopback to your localhost

$ sudo ifconfig lo0 alias 172.16.123.1

This will define a loopback network interface that points to your localhost. When you need to access the localhost you can use this ip.