centos7 yum 不在维护解决

sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/*.repo

sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/*.repo

sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/*.repo