原文地址：https://www.cnblogs.com/liujiaxin2018/p/16331458.html
1、查看系统
[root@PC1 home]# cat /etc/redhat-release Red Hat Enterprise Linux release 9.0 (Plow)
2、测试yum仓库
[root@PC1 home]# yum install httpd Updating Subscription Management repositories. Unable to read consumer identity This system is not registered with an entitlement server. You can use subscription-manager to register. Error: There are no enabled repositories in "/etc/yum.repos.d", "/etc/yum/repos.d", "/etc/distro.repos.d".
3、创建挂载点
[root@PC1 home]# mkdir -p /media/cdrom
4、进入/etc/yum.repos.d/目录，列出yum仓库配置文件：
[root@PC1 home]# cd /etc/yum.repos.d/ [root@PC1 yum.repos.d]# ls redhat.repo
5、使用vim编辑器编辑redhat.repo文件，保存退出：
[root@PC1 yum.repos.d]# vim redhat.repo [BaseOS] name=BaseOS baseurl=file:///media/cdrom/BaseOS gpgcheck=0 enabled=1 [AppStream] name=AppStream baseurl=file:///media/cdrom/AppStream gpgcheck=0 enabled=1
6、设置开启自启
[root@PC1 yum.repos.d]# vim /etc/fstab ## 最后一行增加如下内容，保存退出
/dev/cdrom /media/cdrom iso9660 defaults 0 0
7、查看挂载情况
[root@PC1 yum.repos.d]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 1.8G 0 1.8G 0% /dev tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 740M 9.6M 730M 2% /run /dev/nvme0n1p2 100G 4.5G 96G 5% / /dev/nvme0n1p5 392G 2.8G 390G 1% /data /dev/nvme0n1p1 4.0G 278M 3.8G 7% /boot tmpfs 370M 128K 370M 1% /run/user/0 /dev/sr0 8.0G 8.0G 0 100% /run/media/root/RHEL-9-0-0-BaseOS-x86_64
8、挂载
[root@PC1 yum.repos.d]# mount -a mount: /media/cdrom: WARNING: source write-protected, mounted read-only.
9、查看挂载情况
[root@PC1 yum.repos.d]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 1.8G 0 1.8G 0% /dev tmpfs 1.9G 0 1.9G 0% /dev/shm tmpfs 740M 9.6M 730M 2% /run /dev/nvme0n1p2 100G 4.5G 96G 5% / /dev/nvme0n1p5 392G 2.8G 390G 1% /data /dev/nvme0n1p1 4.0G 278M 3.8G 7% /boot tmpfs 370M 128K 370M 1% /run/user/0 /dev/sr0 8.0G 8.0G 0 100% /media/cdrom
10、测试yum仓库
[root@PC1 yum.repos.d]# yum install httpd
