2016-08-15 ufw reload,allow, Rails 外部からアクセスできない https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-14-04http://sig9.hatenablog.com/entry/2016/04/23/122243http://qiita.com/tmf16/items/bb789a45c0f456eac11f rails s -b 0.0.0.0