yum中找不到包时候解决方式

有时候使用yum安装memcached或者redis时候，发现not found package时候，在网络中搜索很一堆方法，发现fedora开源的一个包很好用，那就是epel-release，我们以安装redis为例子

[root@nfs-client1 ~]# uname -a 
Linux nfs-client1 2.6.18-308.20.1.el5 #1 SMP Tue Nov 13 10:16:17 EST 2012 i686 i686 i386 GNU/Linux 
[root@nfs-client1 ~]# cat /etc/redhat-release  
CentOS release 5.8 (Final) 
[root@nfs-client1 ~]#  rpm -ivh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm 
Retrieving http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm 
warning: /var/tmp/rpm-xfer.lBzWoo: Header V3 DSA signature: NOKEY, key ID 217521f6 
Preparing...                ########################################### [100%] 
   1:epel-release           ########################################### [100%] 
[root@nfs-client1 ~]# yum repolist 
Loaded plugins: fastestmirror, security 
Loading mirror speeds from cached hostfile 
 * addons: mirrors.sohu.com 
 * base: mirrors.163.com 
 * epel: mirrors.ustc.edu.cn 
 * extras: mirrors.163.com 
 * updates: mirrors.163.com 
epel                                                                                                                                  | 3.7 kB     00:00      
epel/primary_db                                                                                                                       | 3.1 MB     00:08      
repo id                                                  repo name                                                                                     status 
addons                                                   CentOS-5 - Addons - sohu.com                                                                      0 
base                                                     CentOS-5 - Base - sohu.com                                                                    2,725 
epel                                                     Extra Packages for Enterprise Linux 5 - i386                                                  5,885 
extras                                                   CentOS-5 - Extras - sohu.com                                                                    286 
updates                                                  CentOS-5 - Updates - sohu.com                                                                 1,003 
repolist: 9,899 
[root@nfs-client1 ~]# yum install redis 
Loaded plugins: fastestmirror, security 
Loading mirror speeds from cached hostfile 
 * addons: mirrors.sohu.com 
 * base: mirrors.163.com 
 * epel: mirrors.ustc.edu.cn 
 * extras: mirrors.163.com 
 * updates: mirrors.163.com 
Setting up Install Process 
Resolving Dependencies 
--> Running transaction check 
---> Package redis.i386 0:2.4.10-1.el5 set to be updated 
--> Finished Dependency Resolution 
  
Dependencies Resolved 
  
============================================================================================================================================================= 
 Package                             Arch                               Version                                     Repository                          Size 
============================================================================================================================================================= 
Installing: 
 redis                               i386                               2.4.10-1.el5                                epel                               299 k 
  
Transaction Summary 
============================================================================================================================================================= 
Install       1 Package(s) 
Upgrade       0 Package(s) 
  
Total download size: 299 k 
Is this ok [y/N]:  -- ok 问题解决

下面有EPEL解释

1. 什么是企业版 Linux 附加软件包(EPEL)?

企业版 Linux 附加软件包(以下简称 EPEL)是一个由特别兴趣小组创建、维护并管理的，针对红帽企业版 Linux(RHEL)及其衍生发行版(比如 CentOS、 Scientific Linux)的一个高质量附加软件包项目。

EPEL 的软件包通常不会与企业版 Linux 官方源中的软件包发生冲突，或者互相替换文件。EPEL 与 Fedora 项目基本一致，包含完整的构建系统、升级管理器、镜像管理器等等。

您可以到任意一台 EPEL 镜像服务器的目录查看：点击此处查看 EPEL 镜像的列表

或者您也可以使用 repoview 来查看:

EPEL 6: i386, x86_64, ppc64, sources
EPEL 5: i386, x86_64, ppc, sources
我怎样获取 EPEL 的软件包?

EPEL 包含一个叫做'epel-release'的包，这个包包含了 EPEL 源的 gpg 密钥和软件源信息。您可以通过 yum 安装到您的企业版 Linux 发行版上。除了 epel-release 源，还有一个叫做'epel-testing'的源，这个源包含最新的测试软件包，其版本很新但是安装有风险，请自行斟酌。

注意:
RHN 用户请注意
您也许需要启用某些'可选择的'源来安装依赖组件。这里有一个针对 RHN 的教程。
如果您使用第6版企业版 Linux，请安装这个 RPM 包: epel-release-6-5.noarch.rpm http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm

如果您使用第5版企业版 Linux，请安装这个 RPM 包: epel-release-5-4.noarch.rpm

http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm

您可以通过: Fedora 项目公钥列表页面来验证 EPEL 源所有包的签名。

来自为知笔记(Wiz)