`guard-rackup` is an alternative of [shotgun](https://github.com/rtomayko/shotgun/) # Install $ gem i guard-rackup Or add it your Gemfile: $ gem "guard-rackup" $ bundle install And then add a basic setup to your Guardfile: $ guard init rackup # Usage Please reada [Guard document](https://github.com/guard/guard#readme) # Guardfile guard "rackup" do watch(%r{^app/.*\.rb$}) watch(%r{^lib/.*\.rb$}) ... end Or guard "rackup", :command => "unicorn ./config.ru -E development", :start => proc{ Process.spawn(command) }, :stop => proc{|pid| Process.kill("QUIT", pid)}, :reload => proc{ Process.kill("HUP", @pid) } do watch ... end