官网源地址：https://vault.centos.org/6.0/
命令执行
sudo cp -ar /etc/yum.repos.d /etc/yum.repos.d.bak
https://vault.centos.org/6/os/x86_64/repodata/repomd.xml

CentOS-Base.repo

#

The mirror system uses the connecting IP address of the client and the

update status of each mirror to pick mirrors that are updated to and

geographically close to the client. You should use this for CentOS updates

unless you are manually picking other mirrors.

#

If the mirrorlist= does not work for you, as a fall back you can try the

remarked out baseurl= line instead.

#
#

[base]
name=CentOS-$releasever - Base - vault.centos.org
failovermethod=priority
baseurl=https://vault.centos.org/6.0/os/$basearch/
https://vault.centos.org/6.0/os/$basearch/
https://vault.centos.org/6.0/os/$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-6

released updates

[updates]
name=CentOS-$releasever - Updates - vault.centos.org
failovermethod=priority
baseurl=https://vault.centos.org/6.0/updates/$basearch/
https://vault.centos.org/6.0/updates/$basearch/
https://vault.centos.org/6.0/updates/$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-6

additional packages that may be useful

[extras]
name=CentOS-$releasever - Extras - vault.centos.org
failovermethod=priority
baseurl=https://vault.centos.org/6.0/extras/$basearch/
https://vault.centos.org/6.0/extras/$basearch/
https://vault.centos.org/6.0/extras/$basearch/
gpgcheck=1
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-6

additional packages that extend functionality of existing packages

[centosplus]
name=CentOS-$releasever - Plus - vault.centos.org
failovermethod=priority
baseurl=https://vault.centos.org/6.0/centosplus/$basearch/
https://vault.centos.org/6.0/centosplus/$basearch/
https://vault.centos.org/6.0/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-6

contrib - packages by Centos Users

[contrib]
name=CentOS-$releasever - Contrib - vault.centos.org
failovermethod=priority
baseurl=https://vault.centos.org/6.0/contrib/$basearch/
https://vault.centos.org/6.0/contrib/$basearch/
https://vault.centos.org/6.0/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://vault.centos.org/RPM-GPG-KEY-CentOS-6

sudo yum clean all
sudo yum makecache