一、本地YUM源

1、备份源文件

cd /etc/yum.repos.d/
mkdir bak
mv .repo bak/

2、挂载镜像

mount -t iso9660 /dev/cdrom /mnt/

开机挂载

echo "mount -o loop -t iso9660  /dev/cdrom /mnt/"  >> /etc/rc.d/rc.local
chmod +x /etc/rc.d/rc.local
/etc/rc.d/rc.local

3、编辑YUM源仓库文件

vim /etc/yum.repos.d/local.repo

新增以下内容

[localREPO]
name=localhost8
baseurl=file:///mnt/cdrom/BaseOS
enable=1
gpgcheck=0

[localREPO_APP]
name=localhost8_app
baseurl=file:///mnt/cdrom/AppStream
enable=1
gpgcheck=0

4、清理YUM缓存, 重建YUM仓库

yum clean all

yum makecache

yum repolist

二、配置CentOS YUM源

1、备份源文件

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

2、下载CentOS-Base.repo 到/etc/yum.repos.d/

cd /etc/yum.repos.d/

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

mv Centos-8.repo redhat.repo

3、清理YUM缓存，重建YUM仓库

yum clean all
yum makecache
yum repolist

Red Hat Enterprise Linux 8配置YUM源的两种方式

原文：https://www.cnblogs.com/PrimerPlus/p/12955498.html