设置yum本地源

# 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:///media/CentOS/
#        file:///media/cdrom/
#        file:///media/cdrecorder/
baseurl=file:///mnt/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5

首先先挂载centos的安装包到本地，也可以地址复制到本地。最后就可以安装了，如要安装mysql

#yum --enablerepo=c5-media install mysql