Here is a correction to my NGINX example:
set_real_ip_from <reverse proxy IP address>;

real_ip_header X-Forwarded-For;

+1 Anything I say here would just repeat what others have already stated. I would love to see this!

James,

I was wondering what you used as the base OS image. I am very new to docker as well but I was hoping to try to get this to work on my unRaid server, I bet the process would be similar. 

What is wrong with running the files outside of the container? I think this makes it makes updating easier.