Converting "docker run -v external_folder:internal_folder
A little background...
I'm using a Dockerfile to build a local image with two built-from-source packages to get the features I need. So rather than "docker run -it -v something:something, I added the following line to my Docker file:
# Copy the contents of ./etc into the image
COPY $PWD/etc/ /etc/
This will copy the files in my $PWD/etc folder into the image completely removing the need for all of the volume mounts. Works perfectly.