在使用CentOS 5.X过程中，虽然自身源仓库里的软件包比起RedHat已经全了很多，但还是有很多常用的包没有，这时候就要用到第三方的源仓库，我这里使用的是rpmfusion这个源，相对来说速度很快，软件包也很齐全。
1、查看系统已经开启的YUM
[root@server ~]# yum repolist
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.btte.net
* extras: mirrors.btte.net
* updates: mirrors.btte.net
repo id repo name status
addons CentOS-5 - Addons enabled: 0
base CentOS-5 - Base enabled: 2,725
extras CentOS-5 - Extras enabled: 282
updates CentOS-5 - Updates enabled: 858
# 发现并没有启用rpmfusion源
2、安装rpmfusion仓库包（在这之前先安装 epel-release的包）
32位：
[root@server ~]# rpm -ivh Fedora/epel/5/i386/epel-release-5-4.noarch.rpm
Retrieving
warning: /var/tmp/rpm-xfer.AJYJu6: Header V3 DSA signature: NOKEY, key ID 217521f6
Preparing... ########################################### [100%]
1:epel-release ########################################### [100%]
[root@server ~]# rpm -ivh http://mirrors.163.com/rpmfusion/nonfree/el/updates/5/i386/rpmfusion-nonfree-release-5-1.noarch.rpm
Retrieving
Retrieving
warning: /var/tmp/rpm-xfer.XlgX0E: Header V3 DSA signature: NOKEY, key ID e74f0522
warning: /var/tmp/rpm-xfer.ErMur0: Header V3 DSA signature: NOKEY, key ID ab194290
Preparing... ########################################### [100%]
1:rpmfusion-free-release ########################################### [ 50%]
2:rpmfusion-nonfree-relea########################################### [100%]
64位：
[root@server ~]# rpm -ivh
[root@server ~]# rpm -ivh http://mirrors.163.com/rpmfusion/nonfree/el/updates/5/x86_64/rpmfusion-nonfree-release-5-1.noarch.rpm
3、重新创建YUM缓存
[root@server ~]# yum clean all && yum makecache
Loaded plugins: fastestmirror
Cleaning up Everything
Cleaning up list of fastest mirrors
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: centos.ustc.edu.cn
* epel: mirrors.ustc.edu.cn
* extras: centos.ustc.edu.cn
* rpmfusion-free-updates: mirrors.ustc.edu.cn
* rpmfusion-nonfree-updates: mirrors.ustc.edu.cn
* updates: centos.ustc.edu.cn
addons | 1.9 kB 00:00
addons/filelists_db | 564 B 00:00
addons/other_db | 552 B 00:00
addons/primary_db | 1.1 kB 00:00
base | 1.1 kB 00:00
base/filelists | 3.0 MB 01:04
base/other | 10 MB 03:48
base/group | 1.1 MB 00:23
base/primary | 967 kB 00:20
epel | 3.7 kB 00:00
epel/filelists_db | 4.8 MB 01:44
epel/updateinfo | 465 kB 00:09
epel/other_db | 1.9 MB 00:40
epel/group_gz | 168 kB 00:03
epel/primary_db | 3.1 MB 01:07
extras | 2.1 kB 00:00
extras/filelists_db | 214 kB 00:07
extras/other_db | 426 kB 00:09
extras/group | 9.7 kB 00:00
extras/primary_db | 171 kB 00:03
rpmfusion-free-updates | 2.8 kB 00:00
rpmfusion-free-updates/filelists_db | 37 kB 00:00
rpmfusion-free-updates/other_db | 28 kB 00:00
rpmfusion-free-updates/group_gz | 1.4 kB 00:00
rpmfusion-free-updates/primary_db | 63 kB 00:01
rpmfusion-nonfree-updates | 2.8 kB 00:00
rpmfusion-nonfree-updates/filelists_db | 8.6 kB 00:00
rpmfusion-nonfree-updates/other_db | 7.9 kB 00:00
rpmfusion-nonfree-updates/group_gz | 1.4 kB 00:00
rpmfusion-nonfree-updates/primary_db | 18 kB 00:00
updates | 1.9 kB 00:00
updates/filelists_db | 3.2 MB 01:10
updates/other_db | 15 MB 05:26
updates/primary_db | 757 kB 00:18
base 2725/2725
base 2725/2725
base 2725/2725
Metadata Cache Created
4、验证已经开启的YUM