Apache reverse proxy to redmine

I had all kinds of issues trying to get this to work. I'm trying to proxy from my servers /redmine folder to a container VM running redmine. The problem has been that the container was running redmine in its root folder.

The solution was to tell the container to run redmine in a /redmine folder, from http://www.redmine.org/projects/redmine/wiki/HowTo_Install_Redmine_in_a_sub-URI

Simply had to add:
Redmine::Utils::relative_url_root = "/redmine"
to the end of Redmine's environment.rb and restart Apache