三、下载与安装相应rpmforge的rpm文件包
1、下载rpmforge的rpm文件包
32位系统
[root@CentOS ~]# wget
64位系统
[root@CentOS ~]# wget rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
2、安装DAG的PGP Key
[root@CentOS ~]# rpm --import
3、验证rpmforge的rpm文件包
[root@CentOS ~]# rpm -K rpmforge-release-0.5.2-2.el6.rf.*.rpm
如果报XXX not an rpm package的错，查看是否wget下载的包不完整，包的大小是12K
4、安装rpmforge的rpm文件包
[root@CentOS ~]# rpm -ivh rpmforge-release-0.5.2-2.el6.rf.*.rpm
5、设置/etc/yum.repos.d/rpmforge.repo文件中源的级别，就是添加priority=12这句，如我的rpmforge.repo文件内容：
### Name: RPMforge RPM Repository for RHEL 6 - dag
### URL:
[rpmforge]
name = RHEL $releasever - RPMforge.net - dag
baseurl = RedHat/el6/en/$basearch/rpmforge
mirrorlist =
#mirrorlist = file:///etc/yum.repos.d/mirrors-rpmforge
enabled = 1
protect = 0
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
gpgcheck = 1
priority=12
[rpmforge-extras]
name = RHEL $releasever - RPMforge.net - extras
baseurl = $basearch/extras
mirrorlist =
#mirrorlist = file:///etc/yum.repos.d/mirrors-rpmforge-extras
enabled = 0
protect = 0
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
gpgcheck = 1
[rpmforge-testing]
name = RHEL $releasever - RPMforge.net - testing
baseurl = $basearch/testing
mirrorlist =
#mirrorlist = file:///etc/yum.repos.d/mirrors-rpmforge-testing
enabled = 0
protect = 0
gpgkey = file:///etc/pki/rpm-gpg/RPM-GPG-KEY-rpmforge-dag
gpgcheck = 1
四、下载与安装相应rpmfusion的rpm文件包
（CentOS官方说这个软件库里面的软件稳定性不如rpmforge，选用！rpmfusion官方站：）
[root@CentOS ~]# rpm -Uvh
[root@CentOS ~]# rpm -Uvh
五、测试
1、测试升级
[root@CentOS ~]# yum check-update
输出信息应该会有以下两行：
Loading “priorities” plugin
…
XX packages excluded due to repository priority protections
2、测试各插件是否生效
[root@CentOS ~]# yum check-update
如果出现类似以下输出，则表示配置成功。
Loaded plugins: fastestmirror, priorities, refresh-packagekit
Loading mirror speeds from cached hostfile
下面是一长串软件列表，最后一列形如：
epel
rpmforge
base
说明各个软件包的来源。
备注：
1、如果yum使用过程中出现类似以下错误，多半是因为rpmfusion的server无法连接，可以不用管它，或者将/etc/yum.repo.d/目录下rpmfusion相关的的repo文件中的enable=1改为0，关掉rpmfusion相关的源列表。
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
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2、rpmfusion还会出现类似如下错误：
Error: Cannot retrieve repository metadata (repomd.xml) for repository: rpmfusion-foo. Please verify its path and try again
原因引自#head-33eabca99c1c4fa289a1d757bda49721cd27871a：
Yum cannot connect to the RPM Fusion servers if you get above message. That could be a problem with your local network or a problem with the MirrorManager servers from RPM Fusion. If it's the latter use this comment to temporary work around the problem:
方法是去除所有baseurl和mirrorlist前面的#如下：
su -c "sed -i 's|^#baseurl|baseurl| ; s|^mirrorlist|#mirrorlist|' /etc/yum.repos.d/rpmfusion*free*repo"
To undo the change later use this command:
su -c "sed -i 's|^baseurl|#baseurl| ; s|^#mirrorlist|mirrorlist|' /etc/yum.repos.d/rpmfusion*free*repo"