本人在使用yum安裝軟件的時候，感覺最不爽的是網絡不佳時，安裝的速度特別慢。所以，個人就上網search了一下如何使用Linux的安裝文件作為其yum源。經過幾次嘗試，已經可以成功的配置了。下面是詳細的介紹：
（1）個人的使用環境
本人的CentOS是安裝在vmware上的：VMware workstation 7.1.1 + CentOS 5.5
（2）yum使用的相關文件介紹
CentOS使用的yum源是在/etc/yum.repos.d/目錄下的兩個文件中進行配置的CentOS-Base.repo和CentOS-Media.repo，其中，CentOS-Base.repo是配置網絡yum源，CentOS-Media.repo是配置本地yum源。
[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost yum.repos.d]# ll
total 16
-rw-r--r-- 1 root root 2245 Apr 26 2010 CentOS-Base.repo
-rw-r--r-- 1 root root 626 Apr 26 2010 CentOS-Media.repo
我們可以看看CentOS-Media.repo中的內容：
[root@localhost yum.repos.d]# more 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:///media/CentOS/
file:///media/cdrom/
file:///media/cdrecorder/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
其中，baseurl是本地yum源的位置，當然，根據我們iso的配置位置，這里是可以進行修改的。不過，我只是將iso文件掛載到/media/CentOS/目錄，所以，我也沒有做修改。
（3）掛載iso文件
本人的iso文件是在宿主機上，所以，通過vmware的文件共享，將宿主機上的iso文件掛載到/mnt/hgfs/目錄下：
VM->Settings->Options選項卡->Shared Folders->Set Folder sharing as 'Always enabled'
使用Add button選取本地iso文件的目錄，我的CentOS放在D:/Software/os/目錄下，所以，添加后的截圖如下：
點擊'OK'，完成共享。
在CentOS中，我們可以在/mnt/hgfs/目錄下發現一個os/子目錄，CentOS的iso文件也就在該目錄下，本人共享以后，iso文件在CentOS的路徑為：/mnt/hgfs/os/CentOS-5.5-i386-bin-DVD.iso
將該鏡像文件掛載到/media/CentOS/
[root@localhost yum.repos.d]# mount -o loop /mnt/hgfs/os/CentOS-5.5-i386-bin-DVD.iso /media/CentOS/
（4）使用本地yum源安裝軟件
使用本地yum源的方法在CentOS-Media.repo中已經描述了：
（4.1）除了使用本地yum源，也會是使用其他的yum源
yum --enablerepo=c5-media [command]
（4.2）只是用本地yum源
yum --disablerepo=/* --enablerepo=c5-media [command]
下面是用本地yum源安裝mysql
[root@localhost yum.repos.d]# yum --disablerepo=/* --enablerepo=c5-media install mysql-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* c5-media:
c5-media | 1.1 kB 00:00
c5-media/primary | 920 kB 00:00
c5-media 2599/2599
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package mysql-server.i386 0:5.0.77-4.el5_4.2 set to be updated
--> Processing Dependency: mysql = 5.0.77-4.el5_4.2 for package: mysql-server
--> Processing Dependency: perl(DBI) for package: mysql-server
--> Processing Dependency: libmysqlclient.so.15(libmysqlclient_15) for package: mysql-server
--> Processing Dependency: perl-DBI for package: mysql-server
--> Processing Dependency: libmysqlclient_r.so.15(libmysqlclient_15) for package: mysql-server
--> Processing Dependency: libmysqlclient.so.15 for package: mysql-server
--> Processing Dependency: perl-DBD-MySQL for package: mysql-server
--> Processing Dependency: libmysqlclient_r.so.15 for package: mysql-server
--> Running transaction check
---> Package mysql.i386 0:5.0.77-4.el5_4.2 set to be updated
---> Package perl-DBD-MySQL.i386 0:3.0007-2.el5 set to be updated
---> Package perl-DBI.i386 0:1.52-2.el5 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
mysql-server i386 5.0.77-4.el5_4.2 c5-media 9.8 M
Installing for dependencies:
mysql i386 5.0.77-4.el5_4.2 c5-media 4.8 M
perl-DBD-MySQL i386 3.0007-2.el5 c5-media 148 k
perl-DBI i386 1.52-2.el5 c5-media 600 k
Transaction Summary
================================================================================
Install 4 Package(s)
Upgrade 0 Package(s)
Total download size: 15 M
Is this ok [y/N]: y
Downloading Packages:
--------------------------------------------------------------------------------
Total 469 MB/s | 15 MB 00:00
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID e8562897
c5-media/gpgkey | 1.5 kB 00:00
Importing GPG key 0xE8562897 "CentOS-5 Key (CentOS 5 Official Signing Key) <centos-5-key@centos.org>" from /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : perl-DBI 1/4
Installing : mysql 2/4
Installing : perl-DBD-MySQL 3/4
Installing : mysql-server 4/4
Installed:
mysql-server.i386 0:5.0.77-4.el5_4.2
Dependency Installed:
mysql.i386 0:5.0.77-4.el5_4.2 perl-DBD-MySQL.i386 0:3.0007-2.el5
perl-DBI.i386 0:1.52-2.el5
Complete!
速度很快，要比使用網絡yum源安裝快多了！
