Redhat7 是 Centos7的发行版本，因版权问题在使用yum会提示需注册（就是要花钱ing）；
我们转而使用Centos7源替代；
***************************************公告***************************************
以下内容纯个人撰写，请勿用于商业用途，转载请注明出处，有错误及疑问请留言或私信，谢谢
###########################仅供参考，如涉及版权，请私信###########################
准备：win主机*1、Redhat最小化安装企业版*1
1、Xshell ssh链接redhat，并切换到root账户（后续按照等操作都在Xshell界面进行）
#这个比较简单，一般redhat ssh开机自启，ps命令能直接查看
Last login: Tue Nov 10 09:59:08 2015 from **********suPassword: ps -e|grep ssh 1674 ? 00:00:00 sshd 5814 ? 00:00:00 sshd 5818 ? 00:00:00 sshd
2、win主机打开http://mirrors.163.com/centos/7/os/x86_64/Packages/，Ctrl+F查找wget并下载到本地，直接链接：wget-1.14-10.el7_0.1.x86_64.rpm
3、使用WinSCP，以root登录redhat
4、将下载的wget-1.14-10.el7_0.1.x86_64.rpm 传到/tmp目录
5、安装wget
cd /tmprpm -ivh wget-1.14-10.el7_0.1.x86_64.rpm
6、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
7、下载centos的yum安装包，路径同2，可以直接使用下列链接
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpmwget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-125.el7.centos.noarch.rpmwget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpmwget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-29.el7.noarch.rpm
注意：安装包都在不断更新，请按照包名自己匹配，当前可用2015-11。
8、安装以上下载包
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpmrpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpmrpm -ivh yum-3.4.3-125.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-29.el7.noarch.rpm
[注] :最后2个需要一起安装，否则会出现依赖性错误
9、下载repo文件，注意切换目录
当然你可以简单点，直接将10中的repo复制，并在yum.repos.d目录新建*******.repo文件
cd /etc/yum.repos.d/wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
10、编辑CentOS7-Base-163.repo文件，将其中的$releasever更改为centos的版本号7
此步骤建议下载到本机，使用记事本或notepad打开一键替换，再使用winscp上传到redhat
repo参考：
# CentOS-Base.repo## The mirror system uses the connecting IP address of the client and the# update status of each mirror to pick mirrors that are updated to and# geographically close to the client. You should use this for CentOS updates# unless you are manually picking other mirrors.## If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead.##[base]name=CentOS-7 - Base - 163.com#mirrorlist=http://mirrorlist.centos.org/?release=7&arch=$basearch&repo=osbaseurl=http://mirrors.163.com/centos/7/os/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#released updates[updates]name=CentOS-7 - Updates - 163.com#mirrorlist=http://mirrorlist.centos.org/?release=7&arch=$basearch&repo=updatesbaseurl=http://mirrors.163.com/centos/7/updates/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additional packages that may be useful[extras]name=CentOS-7 - Extras - 163.com#mirrorlist=http://mirrorlist.centos.org/?release=7&arch=$basearch&repo=extrasbaseurl=http://mirrors.163.com/centos/7/extras/$basearch/gpgcheck=1gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7#additional packages that extend functionality of existing packages[centosplus]name=CentOS-7 - Plus - 163.combaseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/gpgcheck=1enabled=0gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
11、yum clean all 清除原有缓存
12、yum makecache 获取yum列表
出现下面提示，表示yum更改完成：
Metadata Cache Created
13、yum repolist可以查看源数据
yum repolistrepo id repo name status!base/x86_64 CentOS-7 - Base - 163.com 8,652!extras/x86_64 CentOS-7 - Extras - 163.com 275!updates/x86_64 CentOS-7 - Updates - 163.com 1,707repolist: 10,634
附件：repo7