2014-12-21 さくらVPS VirtualBox http://orebibou.com/2014/12/centos-7%E3%81%ABvirtual-box%E3%82%92%E3%82%A4%E3%83%B3%E3%82%B9%E3%83%88%E3%83%BC%E3%83%AB%E3%81%99%E3%82%8B/