把系统的yum源更换成aliyun的yum源

使用linux系统的yum 安装 lrzsz报以下错误

Loaded plugins: fastestmirror, refresh-packagekit, security

Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. /
removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist.txt

Error: Cannot find a valid baseurl for repo: base

发现原有的yum源不可用 改用aliyun的yum 

aliyun yum文件配置网站 http://mirrors.aliyun.com/repo/

备份 

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.back

下载配置文件  

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

生成缓存 

yum makecache