修复yum下载失败问题

 

#cd /etc/yum.repos.d/

#cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.orig
#sed -i 's/#baseurl/baseurl/'  /etc/yum.repos.d/CentOS-Base.repo
#sed -i 's/mirrorlist/#mirrorlist/'  /etc/yum.repos.d/CentOS-Base.repo
#sed -i 's/mirror.centos.org/mirrors.163.com/'  /etc/yum.repos.d/CentOS-Base.repo

注意：dns设置必须正确，否则仍然报错