ERROR 22 - "The requested URL returned error: 404 Not Found"
看這篇博客，我直接復制了，感謝博主，
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
網上搗鼓了半天沒弄懂，最后把/etc/yum.repos.d 里只留了一個 CentOS-Base.repo -Base是從網上獲取文件
CentOS-Base.repo 里面的內容為
yum install tree :
