RHEL/CentOS 5.x使用第三方软件库

RHEL/CentOS 5.x使用第三方软件库(EPEL与RPMForge、RPMFusion软件库)。

CentOS下运行yum install flash-plugin或yum install mplayer的时候,提示库里没有找到这个软件?为什么会这样?因为CentOS是RHEL编译过来的,去掉了所有关于版权问题的东西。因此,在没有使用第三方软件库的情况下,很多软件无法用yum install来直接安装。

EPEL(Extra Packages for Enterprise Linux )软件库提供为 EL4 及 EL5 重新编译的 Fedora 组件。这个软件库在不替换系统组件方面下了功夫。在某些情况下它尝试直接针对 CentOS 兼容性的问题,但坚决否定软件库间的兼容性是目标之一。当它与其它第三方软件库混合使用时,问题可能会出现。故此,当你使用 EPEL 时,尤其是当你亦会运用其它件库的组件时,请确保你使用 yum 的 Priorities 插件。

RPMForge库现在已经拥有超过10000种的CentOS的软件包,被CentOS社区认为是最安全也是最稳定的一个第三方软件库。

下面,偶就来讲解下如何使用EPEL与RPMForge、RPMFusion软件仓库:

一、安装yum-priorities插件。

这个插件是用来设置yum在调用软件源时的顺序的。因为官方提供的软件源,都是比较稳定和被推荐使用的。因此,官方源的顺序要高于第三方源的顺序。如何保证这个顺序,就需要安装yum-priorities这插件了。

[root@CentOS ~]# yum install yum-priorities #安装yum-priorities

安装完后需要设置/etc/yum.repos.d/ 目录下的.repo相关文件(如CentOS-Base.repo),在这些文件中插入顺序指令:priority=N (N为1到99的正整数,数值越小越优先)

一般的配置是这样的:

[base], [addons], [updates], [extras] … priority=1
[CentOSplus],[contrib] … priority=2
其他第三的软件源为:priority=N (推荐N>10)

如我的CentOS-Base.repo配置为:

# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#

[base]
name=CentOS-$releasever – Base
mirrorlist=http://mirrorlist.CentOS.org/?release=$releasever&arch=$basearch&repo=os
#baseurl=http://mirror.CentOS.org/CentOS/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
priority=1

#released updates
[updates]
name=CentOS-$releasever – Updates
mirrorlist=http://mirrorlist.CentOS.org/?release=$releasever&arch=$basearch&repo=updates
#baseurl=http://mirror.CentOS.org/CentOS/$releasever/updates/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
priority=1

#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever – Addons
mirrorlist=http://mirrorlist.CentOS.org/?release=$releasever&arch=$basearch&repo=addons
#baseurl=http://mirror.CentOS.org/CentOS/$releasever/addons/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
priority=1

#additional packages that may be useful
[extras]
name=CentOS-$releasever – Extras
mirrorlist=http://mirrorlist.CentOS.org/?release=$releasever&arch=$basearch&repo=extras
#baseurl=http://mirror.CentOS.org/CentOS/$releasever/extras/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
priority=1

#additional packages that extend functionality of existing packages
[CentOSplus]
name=CentOS-$releasever – Plus
mirrorlist=http://mirrorlist.CentOS.org/?release=$releasever&arch=$basearch&repo=CentOSplus
#baseurl=http://mirror.CentOS.org/CentOS/$releasever/CentOSplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
priority=2

#contrib – packages by CentOS Users
[contrib]
name=CentOS-$releasever – Contrib
mirrorlist=http://mirrorlist.CentOS.org/?release=$releasever&arch=$basearch&repo=contrib
#baseurl=http://mirror.CentOS.org/CentOS/$releasever/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
priority=2

二、下载与安装相应EPEL的rpm文件包

1,下载与安装EPEL的rpm文件包

32位系统

[root@CentOS ~]# rpm -ivh http://download.fedora.RedHat.com/pub/epel/5/i386/epel-release-5-4.noarch.rpm

64位系统

[root@CentOS ~]# rpm -ivh http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

如果您不清楚您的系统内核,请使用 uname -a 命令来查看您的内核信息。

2,导入DAG的PGP Key

[root@CentOS ~]# rpm –import /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL

3,设置/etc/yum.repos.d/epel.repo文件中源的级别,就是添加priority=11这句。

如我的epel.repo文件内容:

[epel]
name=Extra Packages for Enterprise Linux 5 – $basearch
#baseurl=http://download.fedoraproject.org/pub/epel/5/$basearch
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-5&arch=$basearch
failovermethod=priority
enabled=1
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
priority=11

[epel-debuginfo]
name=Extra Packages for Enterprise Linux 5 – $basearch – Debug
#baseurl=http://download.fedoraproject.org/pub/epel/5/$basearch/debug
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-debug-5&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
gpgcheck=1

[epel-source]
name=Extra Packages for Enterprise Linux 5 – $basearch – Source
#baseurl=http://download.fedoraproject.org/pub/epel/5/SRPMS
mirrorlist=http://mirrors.fedoraproject.org/mirrorlist?repo=epel-source-5&arch=$basearch
failovermethod=priority
enabled=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL
gpgcheck=1

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