Devise and Multisite

Devise and Multisite

This is namely a multi-site or multiple domain issue, using Ruby on Rails
and Devise gem.
My Environment:
I'm developing a rails application for an enterprise, with multiple
companies inside the corporate structure. The enterprise has its in-house
legacy authentication system. In order to make use of it, I implemented a
remote_authenticatable module according to this.
http://4trabes.com/2012/10/31/remote-authentication-with-devise/
Problem:
Here is the case, there are two legacy systems, located in two domains,
namely
mydomain1.com
mydomain2.com
What I need to do, is to build a single system, that serves login from two
domains
login.mydomain1.com/users/sign_in
login.mydomain2.com/users/sign_in
and based on the domain using, use corresponding Devise strategy and
legacy login, and I will know where the user comes from and do the
following actions accordingly.
Questions:
Is it possible to build such a system?
One Rails, with two domains
Use corresponding strategy, based on the incoming domain