https://blog.gongquiz.com/2021/04/07/%eb%8b%a4%ec%9d%8c-%ec%a4%91-standalone-%eb%b0%a9%ec%8b%9d%ea%b3%bc-inetd-%eb%b0%a9%ec%8b%9d%ec%97%90-%eb%8c%80%ed%95%9c-%eb%b9%84%ea%b5%90-%ec%84%a4%eb%aa%85%ec%9c%bc%eb%a1%9c-%ec%95%8c%eb%a7%9e/