yum安装git失败

今天用 yum 在 centOS8 上安装 git 结果失败了，报错提示：

CentOS Linux 8 - AppStream                                                               28  B/s |  38  B     00:01
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

解决：

cd /etc/yum.repos.d/
sed -i 's/mirrorlist/#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-*

参考：https://stackoverflow.com/a/71309215/1129375