当前国内存货的centos6版本 yum源只剩下搜狐，网易163、阿里云已彻底失效。
使用搜狐yum源需把路径/etc/yum.repos.d/下的CentOS-Base.repo中代码替换为如下代码：
[base]
name=CentOS-6 - Base
baseurl=http://mirrors.sohu.com/centos/6/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#released updates
[update]
name=CentOS-6 - Updates
baseurl=http://mirrors.sohu.com/centos/6/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#packages used/produced in the build but not released
[addons]
name=CentOS-6 - Addons
baseurl=http://mirrors.sohu.com/centos/6/addons/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful
[extras]
name=CentOS-6 - Extras
baseurl=http://mirrors.sohu.com/centos/6/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-6 - Plus
baseurl=http://mirrors.sohu.com/centos/6/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users
[contrib]
name=CentOS-6 - Contrib
baseurl=http://mirrors.sohu.com/centos/6/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
#packages in testing
[testing]
name=CentOS-6 - Testing
baseurl=http://mirrors.sohu.com/centos/6/testing/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.sohu.com/centos/6/os/x86_64/RPM-GPG-KEY-CentOS-6
当然，最好的解决办法是尽快升级centos7!