1.下载yum源
wget http://mirrors.163.com/.help/CentOS6-Base-163.repomv CentOS-Base.repo CentOS-Base.repo.oriyum clean allyum makecacheyum repolistyum -y install lrzsz
附:镜像站点-->点击centos使用帮助-->选择对应版本CentOs下载
问题1
Cannot find a valid baseurl for repo: base/7/x86_64