1、备份原有yum配置文件
cd /etc/yum.repos.d/
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo
mv redhat.repo redhat.repo_bak
2、修改以下两个配置文件，将enabled的值改为0
vi /etc/yum/pluginconf.d/product-id.conf
vi /etc/yum/pluginconf.d/subscription-manager.conf
3、新建yum缓存
yum clean all
yum makecache
若yum源报错，将Centos-8.repo的内容改为以下内容
[base]
name=CentOS-8-stream - Base - mirrors.aliyun.com
baseurl=https://mirrors.aliyun.com/centos/8-stream/BaseOS/$basearch/os/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
#additional packages that may be useful
[extras]
name=CentOS-8-stream - Extras - mirrors.aliyun.com
baseurl=https://mirrors.aliyun.com/centos/8-stream/extras/$basearch/os/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-8-stream - Plus - mirrors.aliyun.com
baseurl=https://mirrors.aliyun.com/centos/8-stream/centosplus/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
[PowerTools]
name=CentOS-8-stream - PowerTools - mirrors.aliyun.com
baseurl=https://mirrors.aliyun.com/centos/8-stream/PowerTools/$basearch/os/
gpgcheck=1
enabled=0
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
[AppStream]
name=CentOS-8-stream - AppStream - mirrors.aliyun.com
baseurl=https://mirrors.aliyun.com/centos/8-stream/AppStream/$basearch/os/
gpgcheck=1
gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-Official
