Redhat 7.0使用CentOS 7 的Yum 网络源

redhat 的更新包只对注册的用户生效，所以我们自己手动更改成CentOS 的更新包，CentOS几乎和redhat是一样的，所以无需担心软件包是否可安装，安装之后是否有问题，另外CentOS公司去年已经被Redhat 收购了，不说费话了，我们还是来操作吧！ 

1、首先查看redhat 7.0系统本身所安装的那些yum 软件包：

  
  

   
   

    
    [root@localhost ~]# rpm -qa | grep yum
   
   
   
   

    
    yum-utils-1.1.31-24.el7.noarch
   
   
   
   

    
    yum-langpacks-0.4.2-3.el7.noarch
   
   
   
   

    
    yum-metadata-parser-1.1.4-10.el7.x86_64
   
   
   
   

    
    yum-rhn-plugin-2.0.1-4.el7.noarch
   
   
   
   

    
    PackageKit-yum-0.8.9-11.el7.x86_64
   
   
   
   

    
    yum-3.4.3-118.el7.noarch
   
   
  
  

2、删除这些软件包

rpm -e yum-3.4.3-118.el7.noarch --nodeps

3、联网状态下，找到自己所需要的版本下载：

   
   

    
    

     
      
    
    
    
    

     
     [root@localhost ~]# wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-118.el7.centos.noarch.rpm
    
    
    
    

     
     [root@localhost ~]# wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
    
    
    
    

     
     [root@localhost ~]# wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-24.el7.noarch.rpm
    
    
    
    

     
     [root@localhost ~]# wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-updateonboot-1.1.31-24.el7.noarch.rpm
    
    
    
    

     
     [root@localhost ~]# wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-24.el7.noarch.rpm
    
    
   
   

注意：有可能会404　Not Found，拷贝地址的前一段 http :// mirrors . 163.com / centos / 7 / os / x86_64 / Packages ，去镜像上选择对于的，有可能因为版本跟新

4、安装软件包：rpm -ivh yum-*

5、新建repo 配置文件

vim /etc/yum.repos.d/CentOS-Base.repo

拷贝24机上的   /etc/yum.repos.d/CentOS-Base.repo文件， 将 $releasever 换成7，可以连接到服务器

拷贝 /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7文件 

[base]

name=CentOS-$releasever - Base

baseurl=http://mirror.centos.org/centos/7/os/$basearch/

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#released updates 

[updates]

name=CentOS-$releasever - Updates

baseurl=http://mirror.centos.org/centos/7/updates/$basearch/

gpgcheck=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful

[extras]

name=CentOS-$releasever - Extras

baseurl=http://mirror.centos.org/centos/7/extras/$basearch/

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

6、测试是否有内容

yum repolist