Centos 8 配置阿里镜像源

1. 进入yum的repos目录

cd /etc/yum.repos.d/

2. 下载CentOS 7的repo文件

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

3. 修改镜像源

vim CentOS-Base.repo
# vim命令模式下执行
:%s/mirrors.cloud.aliyuncs.com/mirrors.aliyun.com/g
:%s/$releasever/$releasever-stream/g

4. 修改所有的CentOS文件内容

sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-*
sed -i 's|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g' /etc/yum.repos.d/CentOS-*

5. 更新镜像源

清除缓存：yum clean all 
生成缓存：yum makecache

6. 更新yum：

yum update