Failed to download metadata for repo ‘appstream‘: Cannot prepare internal mirrorlist

超新星

一、原因
这是因为Centos8于2021年年底停止了服务，使用yum源安装时候，就会报错：Failed to download metadata for repo ‘AppStream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist”，
这时我们需要修改yum源

二、解决办法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-*

# 如果已经安装了wget就不需要这一步
yum install wget –y
# 更新yum源为阿里源
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

yum clean all

yum makecache
# 验证
yum install -y vim