今天在 Centos 下碰到了使用 yum 无法下载的问题，当时报错信息为 “Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist“， 解决方法如下：
- cd /etc/yum.repos.d/
- sed -i 's/mirrolist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
- sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*
- yum makecache
- yum update -y
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