配置 Redhat6 yum 更新源

• 由于 redhat 的 yum 在线更新是收费的，如果没有注册的话不能使用，如果要使用，需将 redhat 的 yum 卸载后，重启安装，再配置其他源.

1. 删除 redhat 原有 yum
   1. rpm -aq | grep yum | xargs rpm -e --nodeps
      
2. 下载 yum 安装文件（如果下载时找不到文件，就登录到：http://mirrors.163.com/centos/6/os/x86_64/ 上查找相应的文件，然后再下载）
   1. 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-metadata-parser-1.1.2-16.el6.x86_64.rpm
      wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
      wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm
      
3. 安装yum
   1. 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
      
4. 更新 repo 文件（目录 /etc/yum.repos.d/ 下原来的文件都是可以删除的）
   1. vim /etc/yum.repos.d/rhel-debuginfo.repo
   2. 写入如下内容：

      1. [base]
         name=CentOS-$releasever - Base
         baseurl=http://mirrors.163.com/centos/6/os/$basearch/
         gpgcheck=1
         gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
         
         #released updates
         [updates]
         name=CentOS-$releasever - Updates
         baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
         gpgcheck=1
         gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
         
         #packages used/produced in the build but not released
         #[addons]
         #name=CentOS-$releasever - Addons
         #baseurl=http://mirrors.163.com/centos/$releasever/addons/$basearch/
         #gpgcheck=1
         #gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
         #additional packages that may be useful
         [extras]
         name=CentOS-$releasever - Extras
         baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
         gpgcheck=1
         gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
         #additional packages that extend functionality of existing packages
         [centosplus]
         name=CentOS-$releasever - Plus
         baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/
         gpgcheck=1
         enabled=0

5. yum clean all
6. update/install vim 测试下
   1. yum -y install vim
      
7. yum 的相关配置可以在文件 /etc/yum.conf 中来指定，具体解释见下截图：
   1. 
      
   2. 
      
   3. 
   4. 默认设置是这样的
      1. 
         
      2. 
         
      3. 则下载安装过的安装包可以在目录  /var/cache/yum/x86_64/$releasever/base/packages 下找到