you can solve:
sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/CentOS-*.reposed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/CentOS-*.reposed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/CentOS-*.repoyum clean allyum makecache
sed -i s/mirror.centos.org/vault.centos.org/g /etc/yum.repos.d/CentOS-*.repo
sed -i s/^#.*baseurl=http/baseurl=http/g /etc/yum.repos.d/CentOS-*.repo
sed -i s/^mirrorlist=http/#mirrorlist=http/g /etc/yum.repos.d/CentOS-*.repo
yum clean all
yum makecache