Q:

Simple routes in rail3

I'm trying to an admin subdomain to provide some back-end protected access to my site.  
I'm seeing lots of rather complex tutorials on how to make subdomains to match any string, but I just want something simple.  
In my route, I have

 constraints(:subdomain => 'admin') do
    resources :admin
    root :to => 'admin#index'
  end

but this doesn't resolve.  
I'm running my development in an ubuntu virtual machine, so I connect through the ip address, not localhost, so most of the questions where people have problems because of localhost I don't think apply to me.  
Anybody know what I've got wrong?  

A:

you need to handle this through /etc/hosts and provide a real hostname when connecting like admin.example.com

