CentOS8 yum安装AppStream报错问题 - 完美解决方案，更新yum后仍无法makecache

[root@C8-3 ~]# yum -y install httpd mariadb-server mariadb php php-mysql
Repository AppStream is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository PowerTools is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository fasttrack is listed more than once in the configuration
CentOS-8 - AppStream                           0.0  B/s |   0  B     00:08    
Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'

# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup.3
# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos8_base.repo

# yum clean all

# yum makecache

CentOS-8 - AppStream                           0.0  B/s |   0  B     00:04    
Failed to download metadata for repo 'AppStream'
Error: Failed to download metadata for repo 'AppStream'

# vim /etc/yum.repos.d/CentOS-AppStream.repo

#这一段注释掉
#[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/$basearch/os/
#mirrorlist=http://mirror.centos.org/$contentdir/$releasever/AppStream/$basearch/os/
#gpgcheck=1
#enabled=1
#pgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial

#改为下面这段
[AppStream]
name=Qcloud centos AppStream - $basearch
baseurl=http://mirrors.cloud.tencent.com/centos/$releasever/AppStream/$basearch/os/
enabled=0
gpgcheck=1
gpgkey=http://mirrors.cloud.tencent.com/centos/RPM-GPG-KEY-CentOS-Official

# yum makecache