问题解决：Failed to download metadata for repo ‘appstream‘: Cannot prepare internal mirrorlist:…

1、进入yum的repos目录

cd /etc/yum.repos.d/

2、修改所有的CentOS文件内容文章源自爱尚资源教程网-https://www.23jcw.net/1753.html

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-*

3、更新yum源为阿里镜像文章源自爱尚资源教程网-https://www.23jcw.net/1753.html

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

4、yum安装测试是否可以yum安装文章源自爱尚资源教程网-https://www.23jcw.net/1753.html

yum install wget –y