cdh4 yum安装;
http://www.cloudera.com/content/support/en/documentation/cdh4-documentation/cdh4-documentation-v4-latest.html
根据cpuArch选择;
x86-64 or i386;
http://mirrors.163.com/CentOS/5/os/i386/CentOS/
# 备份
# mv /etc/yum.repos.d/CentOS-Base.repo{,.bak}
# 修改
# vi /etc/yum.repos.d/CentOS-Base.repo
# yum clean all
# yum makecache #将服务器上的软件包信息缓存到本地,以提高搜索安装软件的速度
# yum install vim* #测试域名是否可用
# yum update #更新系统