vi /etc/yum.conf
(윗부분 생략) ... [base] name=CentOS $releasever - Base baseurl=http://ftp.daumkakao.com/centos/7/os/x86_64/ gpgcheck=0 [updates] name=CentOS $releasever - Updates baseurl=http://ftp.daumkakao.com/centos/7/updates/x86_64/ gpgcheck=0