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思路：卸载Red Hat Enterprise Linux 6.4自带yum，然后下载CentOS的yum，安装后修改配置文件 1、首先到http://mirrors.163.com/centos下载软件包 x86 地址：http://mirrors.163.com/centos/6/os/i386/Packages/ x86_64 地址：http://mirrors.163.com/centos/6/os/x86_64/Packages/ 必要下载的软件包有（以64位系统为例）： a python-iniparse-0.3.1-2.1.el6.noarch.rpm b yum-3.2.29-40.el6.centos.noarch.rpm c yum-metadata-parser-1.1.2-16.el6.x86_64.rpm d yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm 下载命令： wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-3.2.29-40.el6.centos.noarch.rpm wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm [注] :版本不一定要最新的 2、卸载RedHat自带的yum rpm -qa | grep yum | xargs rpm -e --nodeps 注：a、xargs是一条Unix和类Unix操作系统的常用命令。它的作用是将参数列表转换成小块分段传递给其他命令，以避免参数列表过长的问题 b、--nodeps 强制卸载,不管依赖性 3、安装下载的centos的yum包： rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm rpm -ivh yum-3.2.29-40.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm [注] :最后2个需要一起安装，否则会出现依赖性错误 4、到http://mirrors.163.com的 centos帮助文档 中下载CentOS6-Base-163.repo文件，存放到/etc/yum.repo.d中 wget http://mirrors.163.com/.help/CentOS6-Base-163.repo 5、编辑CentOS6-Base-163.repo文件，将其中的$releasever更改为centos的版本号 下面是修改好的： # CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # #
[base] name=CentOS-6 - Base - 163.com baseurl=http://mirrors.163.com/centos/6/os/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#released updates [updates] name=CentOS-6 - Updates - 163.com baseurl=http://mirrors.163.com/centos/6/updates/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that may be useful [extras] name=CentOS-6 - Extras - 163.com baseurl=http://mirrors.163.com/centos/6/extras/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=extras gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packages [centosplus] name=CentOS-6 - Plus - 163.com baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=centosplus gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#contrib - packages by Centos Users [contrib] name=CentOS-6 - Contrib - 163.com baseurl=http://mirrors.163.com/centos/6/contrib/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=contrib gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 6、yum clean all 清除原有缓存 7、yum makecache 获取yum列表 出现下面提示，表示yum更改完成：
Metadata Cache Created Red Hat Enterprise 6.4配置CentOS 6.4软件源另一篇： 1. 用su 命令切换到root
2. 删除rhel6.4自带的yum，命令如下：
3. 下载CentOS 6.4的yum，命令如下：
4.安装yum
5.配置repo文件
保存后将CentOS-Base.repo移到/etc/yum.repos.d/ 里面，命令如下：
6.清除yum缓存 7.试试能不能用 yum install gcc-c++-4.4.7-3.el6
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