Rails + Devise. Different authentication entry points.

I'm building a web site. There will be users and admins. Users will have
their own authentication panel and admins must have absolutely different
authentication entry point and administrative panel. I know how to build
a Rails app with one authentication entry point, but how to make an
application with different authentication entry points e.g. /users/login
& /admin/login? Both panels are not connected with each other and have
absolutely different logic.

Thank you for your answers in advance.

Devise docs have a section on configuring multiple models: https://github.com/plataformatec/devise#configuring-multiple-models. If you follow the instructions it should work.