1 centos
1.1 备份CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
1.2 进入yum源配置文件所在文件夹
# cd /etc/yum.repos.d/
1.3 下载163的yum源配置文件，放入/etc/yum.repos.d/(操作前请做好相应备份)
# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo
1.4 运行yum makecache生成缓存
# yum clean all
# yum makecache
1.5 更新系统
# yum -y update