Centos6无法使用yum，错误提示为：Error: Cannot find a valid baseurl for repo: base
在Centos6上执行yum -y install lrzsz命令，出现以下报错信息：Loaded plugins: fastestmirror, securitySetting up Install ProcessLoading mirror speeds from cached hostfileYumRepo Error: All mirror URLs are not using ftp, http[s] or file.Eg. Invalid release/repo/arch com.
