centos6.5 yum install 更换国内源 url 404 not found

ERROR 22 - "The requested URL returned error: 404 Not Found"

看这篇博客，我直接复制了，感谢博主，

http://blog.itblood.com/3681.html

[centos-office]
name=centos-office
failovermethod=priority
baseurl=https://vault.centos.org/6.10/os/x86_64/
gpgcheck=1
gpgkey=https://vault.centos.org/6.10/os/x86_64/RPM-GPG-KEY-CentOS-6

网上捣鼓了半天没弄懂，最后把/etc/yum.repos.d  里只留了一个  CentOS-Base.repo     -Base是从网上获取文件

  CentOS-Base.repo  里面的内容为

yum install tree  :