直接使用以下代码解决：

echo "https://vault.centos.org/6.10/os/x86_64/" > /var/cache/yum/x86_64/6/base/mirrorlist.txt
echo "http://vault.centos.org/6.10/extras/x86_64/" > /var/cache/yum/x86_64/6/extras/mirrorlist.txt
echo "http://vault.centos.org/6.10/updates/x86_64/" > /var/cache/yum/x86_64/6/updates/mirrorlist.txt
echo "http://vault.centos.org/6.10/sclo/x86_64/rh" > /var/cache/yum/x86_64/6/centos-sclo-rh/mirrorlist.txt
echo "http://vault.centos.org/6.10/sclo/x86_64/sclo" > /var/cache/yum/x86_64/6/centos-sclo-sclo/mirrorlist.txt

注意使用命令yum clean all会让以上失效。