一、备份默认的repo文件

cd /etc/yum.repos.d
mkdir backup
mv *.repo backup

二、更换为国内的yum源

1、更换为阿里云的yum源

创建一个新的repo文件，把所有配置都放在同一个文件

vim Aliyun-Centos-Stream-8.repo

把以下配置拷贝到Aliyun-Centos-Stream-8.repo文件并保存

[BaseOS]
name=BaseOS
baseurl=https://mirrors.aliyun.com/centos/8-stream/BaseOS/x86_64/os/
enabled=1
gpgcheck=0

[Appstream]
name=Appstream
baseurl=https://mirrors.aliyun.com/centos/8-stream/AppStream/x86_64/os/
enabled=1
gpgcheck=0

[Extras]
name=Extras
baseurl=https://mirrors.aliyun.com/centos/8-stream/extras/x86_64/os/
enabled=1
gpgcheck=0

[PowerTools]
name=PowerTools
baseurl=https://mirrors.aliyun.com/centos/8-stream/PowerTools/x86_64/os/
enabled=1
gpgcheck=0

2、更换为华为云的yum源

创建一个新的repo文件，把所有配置都放在同一个文件

vim Huaweiyun-Centos-Stream-8.repo

把以下配置拷贝到Huaweiyun-Centos-Stream-8.repo文件并保存

[BaseOS]
name=BaseOS
baseurl=https://repo.huaweicloud.com/centos/8-stream/BaseOS/x86_64/os/
enabled=1
gpgcheck=0

[Appstream]
name=Appstream
baseurl=https://repo.huaweicloud.com/centos/8-stream/AppStream/x86_64/os/
enabled=1
gpgcheck=0

[Extras]
name=Extras
baseurl=https://repo.huaweicloud.com/centos/8-stream/extras/x86_64/os/
enabled=1
gpgcheck=0

[PowerTools]
name=PowerTools
baseurl=https://repo.huaweicloud.com/centos/8-stream/PowerTools/x86_64/os/
enabled=1
gpgcheck=0

三、清理原本的yum软件源列表

yum clean all

四、更新新的yum软件源列表

yum makecache