更改yum源为网易的。

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

cd /etc/yum.repos.d/

yum install wget -y

wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

yum clean all

yum makecache