Ruby Server Git Deploy Unicorn nginx passenger
https://www.digitalocean.com/community/articles/a-comparison-of-rack-web-servers-for-ruby-web-applications
http://spring-mt.tumblr.com/post/19282358465/apache-nginx-x-passenger-unicorn
http://blog.s21g.com/articles/2346
http://qiita.com/konpyu/items/3ba3774bcde226d7d07d
http://blog.uu59.org/2012-04-18-ruby-httpd.html
https://www.digitalocean.com/community/articles/how-to-deploy-rails-apps-using-unicorn-and-nginx-on-centos-6-5
https://www.digitalocean.com/community/articles/how-to-set-up-automatic-deployment-with-git-with-a-vps
http://kyamada.hatenablog.com/entry/2012/09/17/102740
http://yss44.hatenablog.com/entry/2014/01/06/135734
https://gist.github.com/mitukiii/4106900
http://succi.jp/blog/?p=1317
http://www.kkaneko.com/rinkou/rubydb/sinatra.html