CentOS8 换源

1.删除AppStream源

rm -f /etc/yum.repos.d/CentOS-AppStream.repo

2.备份配置文件（可直接删除）

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

3.执行下载命令

wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

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#或者
​
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo

4.清除原有yum缓存

yum clean all

5.刷新缓存

yum makecache

6.更新

yum update