How to find the local port a rails instance is running on?

Question

So I would like my Rails app instances to register themselves on a \"I\'m up\" kind of thing I\'m playing with, and I\'d like it to be able to mention what local port it\'s

Answer 1

From inside any controller action, check the content of request.port, thus:

class SomeController < ApplicationController
  def some_action
    raise "I'm running on port #{request.port}."
  end
end