vim /etc/yum.conf
proxy=
vim ~/.bash_profile
http_proxy=IP地址:端口号
ftp_proxy=
vim /etc/wgetrc
http_proxy=
ftp_proxy=
vim /etc/yum.repos.d/CentOS-Base.repo
http://www.wdlinux.cn/old/yum_CentOS-Base.repo
rpm --httpproxy http://proxy-prc.intel.com --httpport 911 --import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
yum update
yum install *