What is this?
This is a helper script to setup an apt-cacher-ng and rawdns for your docker containers. Thanks to psftw's blog and of course tianon.
The only other setup is to add --dns 172.17.42.1 to your Docker daemon options and add 172.17.42.1 to your systems resolver (/etc/resolve.conf if it is not autogenerated). Be sure to keep something like 8.8.8.8 and 8.8.4.4 in resolve.conf just in case the container or docker fails to start.
Caveats
apt-cacher-ng container may fail to start on boot if the mounted directory does not exist.