<https://ruka.app/etc-resolv-conf%e3%81%aenameserver%e3%82%92%e5%a4%89%e6%9b%b4%e3%81%99%e3%82%8b/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://ruka.app/etc-resolv-conf%E3%81%AEnameserver%E3%82%92%E5%A4%89%E6%9B%B4%E3%81%99%E3%82%8B/>