Centos下替换yum源为阿里云源

阿里云Linux安装镜像源地址：http://mirrors.aliyun.com/
第一步：备份原镜像文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
第二步：下载CentOS-Base.repo 到/etc/yum.repos.d/
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
第三步：运行yum makecache生成缓存
yum clean all

运行yum makecache生成缓存

yum makecache

更新系统
yum -y update

http://www.centoscn.com/image-text/config/2016/1226/8296.html