I tried using “Pow”, a development HTTP server for Rack applications like Ruby on Rails and Sinatra. (Mac OS X only)

・Pow: Zero-configuration Rack server for Mac OS X

curl get.pow.cx | sh
cd ~/.pow
ln -s /path/to/myapp

■ How to restart

touch ~/.pow/myapp/tmp/restart.txt

■ Log streaming

tail -F ~/.pow/myapp/log/development.log

【Reference】

・[Pow]Railsで使える便利な開発サーバー #Mac #Rails #Ruby - Qiita

That’s all from the Gemba.