1.参考Centos镜像帮助
（1.1）备份原始repo
shell> sudo mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
（1.2）下载163 repo，放入 /etc/yum.repos.d/ ，并修改文件名称
shell > sudo cd /etc/yum.repos.d/
shell > sudo wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
shell > sudo mv CentOS7-Base-.repo CentOS-Base.repo
ps: 相关repo地址
centos7 : http://mirrors.163.com/.help/CentOS7-Base-163.repo
centos6 : http://mirrors.163.com/.help/CentOS6-Base-163.repo
centos5 : http://mirrors.163.com/.help/CentOS5-Base-163.repo
（1.3）生成缓存
shell> sudo yum clean all
shell > sudo yum makecache
2. 相关链接
官方主页: http://www.centos.org/
邮件列表: http://www.centos.org/modules/tinycontent/index.php?id=16
论坛: http://www.centos.org/modules/newbb/
文档: http://www.centos.org/docs/
Wiki: http://wiki.centos.org/
镜像列表: http://www.centos.org/modules/tinycontent/index.php?id=32