Centos8为 repo ‘AppStream‘ 下载元数据失败

CentOS-8 - AppStream 为 repo ‘AppStream’ 下载元数据失败 错误:为 repo 'AppStream’下载元数据失败
如下图（图转载自https://blog.csdn.net/weixin_43868299/article/details/106085682）

解决：
修改 /etc/yum.repos.d/CentOS-Base.repo，CentOS-AppStream.repo，CentOS-Extras.repo
修改如下：
注释mirrorlist，把baseurl取消注释并修改为阿里云镜像地址
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

修改之后清缓存，制作元数据缓存

# 清除所有缓存文件
yum clean all# 制作元数据缓存
yum makecache

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