添加阿里云源仓库

先备份原始源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bac.20200526

浏览器找到源地址

记住下面的地址

aliyun.com

mirrors.aliyun.com

https://developer.aliyun.com/mirror/

找到CentOS 8

CentOS 8

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo

或者

curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo

回到shell粘贴上述某个命令、

按网页上刷新源即可

运行 yum makecache 生成缓存

[10:27:01 root@C8[ ~]#yum makecache
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
CentOS-8 - AppStream                                 7.1 kB/s | 4.3 kB     00:00    
CentOS-8 - Base - mirrors.aliyun.com                  34 kB/s | 3.9 kB     00:00    
CentOS-8 - Extras - mirrors.aliyun.com                11 kB/s | 1.5 kB     00:00    
Metadata cache created.