If you ever want to connect to your own server or someone else's over your ethernet, use the following command in your terminal to start your server:
rails s -b 0.0.0.0 -p 3000
Wanting to run two different rails servers at once on the same machine? Simply change the ports the are running on to have them run simultaneously.
rails s -p 3000
rails s -p 4000
If you need to add any images to your rails app with carrierwave or in general, here is how to do it for that column.
File.new(Rails.root.join("app","assets", "images", "my_image.png"))