https://blog.faceutil.com/2017/04/19/dnf-%ec%8a%a4%ed%82%a8-%ec%8b%ac%ed%94%8c-%ec%95%84%ec%9d%b4%ed%85%9c-%ed%85%8c%eb%91%90%eb%a6%ac-%ec%8a%a4%ed%82%a8-ver-170119-%e3%82%b1/