Centos8為 repo ‘AppStream‘ 下載元數據失敗

CentOS-8 - AppStream 為 repo ‘AppStream’ 下載元數據失敗 錯誤:為 repo 'AppStream’下載元數據失敗 如下圖（圖轉載自https://blog.csdn.net/weixin_43868299/article/details/106085682） 解決： 修改 /etc/yum.repos.d/CentOS-Base.repo，CentOS-AppStream.repo，CentOS-Extras.repo 修改如下： 注釋mirrorlist，把baseurl取消注釋並修改為阿裏雲鏡像地址 CentOS-Base.repo：

# CentOS-Base.repo
[BaseOS]
name=CentOS-$releasever - Base
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=BaseOS&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/BaseOS/$basearch/os/
baseurl=https://mirrors.aliyun.com/centos/$releasever/BaseOS/$basearch/os/
gpgcheck=1




enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

CentOS-AppStream.repo：

# CentOS-AppStream.repo
[AppStream]
name=CentOS-$releasever - AppStream
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
#baseurl=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
baseurl=https://mirrors.aliyun.com/centos/$releasever/AppStream/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

CentOS-Extras.repo：

# CentOS-Extras.repo
[extras]
name=CentOS-$releasever - Extras
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras&infra=$infra




#baseurl=http://mirror.centos.org/$contentdir/$releasever/extras/$basearch/os/
baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/os/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

修改之後清緩存，制作元數據緩存

# 清除所有緩存文件
yum clean all
# 制作元數據緩存
yum makecache