首先
[root@mode media]# cd /etc/yum.repos.d/
[root@mode yum.repos.d]# ll
total 16
-rw-r--r-- 1 root root 560 Dec 19 01:20 CentOS-Media.repo
drwxr-xr-x 2 root root 4096 Dec 18 20:03 bak
drwxr-xr-x 2 root root 4096 Jan 28 19:17 ncurses-devel
drwxr-xr-x 2 root root 4096 Mar 12 18:32 openssl-devel
[root@mode yum.repos.d]# cat CentOS-Media.repo
# CentOS-Media.repo
#
# This repo is used to mount the default locations for a CDROM / DVD on
# CentOS-5. You can use this repo and yum to install items directly off the
# DVD ISO that we release.
#
# To use this repo, put in your DVD and use it with the other repos too:
# yum --enablerepo=c5-media [command]
#
# or for ONLY the media repo, do this:
#
# yum --disablerepo=\* --enablerepo=c5-media [command] [c5-media]
name=CentOS-$releasever - Media
baseurl=file:///mnt/cdrom/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
看到CentOS-Media.repo中的 baseurl=file:///mnt/cdrom/了吗
假设指定了CentOS-meida源，系统会依据路径查找安装 所须要的包
然后创建文件夹文件，将镜像挂载到那个文件夹中
、
[root@mode yum.repos.d]# mkdir -p /mnt/cdrom
[root@mode yum.repos.d]# mount -o loop /dev/cdrom /mnt/cdrom
然后就能够安装须要安装的软件了：
[root@mode yum.repos.d]# yum --disablerepo=\* --enablerepo=c5-media install xinetd
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package xinetd.x86_64 2:2.3.14-16.el5 set to be updated
--> Finished Dependency Resolution Dependencies Resolved =======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Installing:
xinetd x86_64 2:2.3.14-16.el5 c5-media 127 k Transaction Summary
=======================================================================================================================================================================
Install 1 Package(s)
Upgrade 0 Package(s) Total download size: 127 k
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : xinetd 1/1 Installed:
xinetd.x86_64 2:2.3.14-16.el5 Complete!
[root@mode yum.repos.d]#
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