gistfile1.rb

pool :involver_rails do
 
  cloud :nginx do
    instances 2..2  # binds against 2 elastic IPs
    has_package "nginx"
  end

  cloud :app do
    instances 2..12
    
    # calls register_backend(self) on all members of cloud nginx on bootstrap & configure
    has_frontend_cloud :nginx 
  end

  cloud :db do
    mysql do
      ...
    end
  end

end