centos8 Failed to download metadata for repo 'appstream'
执行 yum 或者 dnf的时候报错
Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlistFix Failed to download metadata for repo
CentOS Linux 8 had reached the End Of Life (EOL) on December 31st, 2021. It means that CentOS 8 will no longer receive development resources from the official CentOS project. After Dec 31st, 2021, if you need to update your CentOS, you need to change the mirrors to vault.centos.org where they will be archived permanently. Alternatively, you may want to upgrade to CentOS Stream.
执行了以下两条命令替换了yum.repos.d配置文件的内容后，成功修复了问题
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-*
yum update -y版权属于：Joyber
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