# cd /etc/yum.repos.d
# mv CentOS-Base.repo CentOS-Base.repo.save
# wget http://centos.ustc.edu.cn/CentOS-Base.repo
2、清理殘留文件然后更新標準庫,再升級
# yum clean all
# yum update glibc\*
# yum update yum\* rpm\* python\*
# yum clean all
# yum update
# reboot