报错：Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
原因： CentOS 已经停止维护的问题
官方：https://blog.centos.org/2020/12/future-is-centos-stream/?spm=a2c4g.11186623.0.0.3b005eb35dW2Kg
解决：
# 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-*
或者
sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.epel.cloud|g' /etc/yum.repos.d/CentOS-Linux-*
标签：sed,centos,CentOS,repos,prepare,mirrorlist,appstream,http From： https://www.cnblogs.com/yu121/p/16597175.html