本次安装的RedHat7.4是安装在Oracle VM VirtualBox5.2.8虚拟机上面的，本文不对安装虚拟机步骤做详细说明。
工具准备：
Oracle VM VirtualBox5.2.8
rhel-server-7.4-x86_64-dvd.iso
安装平台;
win10_x86_64
解决办法：
1、修改网络配置
在RedHat7之后ifconfig命令查看网络命令受限，在登录系统后，可以使用下面的命令查看当前的一些ip地址等网络信息
[root@localhost ~]# ip addr
如果要修改网络配置，使用下面的命令
[root@localhost ~]# vi /etc/sysconfig/network-scripts/ifcfg-enp0s3
修改BOOTPRTO=static，ONBOOT=yes，然后在最下面加入下面的配置
IPADDR=192.168.3.210 PREFIXO=24 GATEWAY=192.168.3.1 DNS1=114.114.114.114
修改之后的配置文件内容如下图所示：
保存并退出之后，使用命令
[root@localhost ~]# service network restart
Restarting network (via systemctl): [ OK ]
测试外网能否请求：
[root@localhost ~]# ping www.baidu.com PING www.a.shifen.com (61.135.169.121) 56(84) bytes of data. 64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=1 ttl=54 time=42.8 ms 64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=2 ttl=54 time=40.9 ms 64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=3 ttl=54 time=41.6 ms 64 bytes from 61.135.169.121 (61.135.169.121): icmp_seq=4 ttl=54 time=40.6 ms ^Z [1]+ Stopped ping www.baidu.com
此时，使用yum命令会出现问题
[root@localhost ~]# yum install lrzsz Loaded plugins: product-id, search-disabled-repos, subscription-manager This system is not registered with an entitlement server. You can use subscription-manager to register.
2、查看系统中的yum，如果有进行卸载
[root@localhost ~]# rpm -qa |grep yum yum-metadata-parser-1.1.4-10.el7.x86_64 yum-rhn-plugin-2.0.1-9.el7.noarch yum-3.4.3-154.el7.noarch
删除redhat自带的yum包
[root@localhost ~]# rpm -qa|grep yum|xargs rpm -e --nodeps
再进行检查，确认卸载完成
[root@localhost ~]# rpm -qa |grep yum [root@localhost ~]#
3、下载163的yum安装包
在网站：http://mirrors.163.com/有相关的许多开源包下载，我们这儿需要的安装包在路径：http://mirrors.163.com/centos/7.4.1708/os/x86_64/Packages/ 中，需要下载的有下面的内容：
http://mirrors.163.com/centos/7.4.1708/os/x86_64/RPM-GPG-KEY-CentOS-7 http://mirrors.163.com/centos/7.4.1708/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm http://mirrors.163.com/centos/7.4.1708/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm http://mirrors.163.com/centos/7.4.1708/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm http://mirrors.163.com/centos/7.4.1708/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
除了上述文件之外，还需要一个CentOS6-Base-163.repo文件，可以通过百度云盘进行搜索下载，在下载完成后通过WinSCP上传到操作系统中。还需要将CentOS6-Base-163.repo文件的内容修改为如下所示:
# 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-7.4.1708 - Base - 163.com baseurl=http://mirrors.163.com/centos/7.4.1708/os/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=7.4.1708&arch=$basearch&repo=os gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7 #released updates [updates] name=CentOS-7.4.1708 - Updates - 163.com baseurl=http://mirrors.163.com/centos/7.4.1708/updates/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=7.4.1708&arch=$basearch&repo=updates gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7 #additional packages that may be useful [extras] name=CentOS-7.4.1708 - Extras - 163.com baseurl=http://mirrors.163.com/centos/7.4.1708/extras/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=7.4.1708&arch=$basearch&repo=extras gpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-7.4.1708 - Plus - 163.com baseurl=http://mirrors.163.com/centos/7.4.1708/centosplus/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=7.4.1708&arch=$basearch&repo=centosplus gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7 #contrib - packages by Centos Users [contrib] name=CentOS-7.4.1708 - Contrib - 163.com baseurl=http://mirrors.163.com/centos/7.4.1708/cr/$basearch/ #mirrorlist=http://mirrorlist.centos.org/?release=7.4.1708&arch=$basearch&repo=contrib gpgcheck=1 enabled=0 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-7
使用下面的命令开始yum源的安装，本人安装的时候两个都用了，有的资料上只使用了其中的一个，本人安装使用第一个只安装了python相关的包，而且提示有警告，再使用第二个命令之后才安装完yum-抬头的相关包。
[root@localhost ~]# rpm -ivh *.rpm [root@localhost ~]# rpm -ivh yum-*
如果安装时出现依赖包的问题，有可能会出现Python包安装冲突的问题。所以在此处命令可以加上两个参数强制安装：
- --force 即使覆盖属于其它包的文件也强迫安装
- --nodeps 如果该RPM包的安装依赖其它包，即使其它包没装，也强迫安装。
安装完成之后需要将上传的CentOS6-Base-163.repo文件以及RPM-GPG-KEY-CentOS-7文件移动到相应的位置中。
[root@localhost ~]# mv CentOS6-Base-163.repo /etc/yum.repos.d/
[root@localhost ~]# mv RPM-GPG-KEY-CentOS-7 /etc/pki/rpm-gpg/
经过这步之后经测试可以使用yum的相关命令的，可以安装SecureCRT上传下载相关的组件
[root@localhost yum.repos.d]# yum install lrzsz
但是既然有RPM-GPG-KEY-CentOS-7文档，我们应该将它也转入相关的目录下面，虽然现在测试不转好像也没有影响。根据百度查找RPM-GPG-KEY-CentOS-7文件应当放入目录/etc/pki/rpm-gpg/中。查看/etc/pki/rpm-gpg/中的内容并将RPM-GPG-KEY-CentOS-7文件移动到该目录中。
[root@localhost yum.repos.d]# cd [root@localhost ~]# cd /etc/pki/rpm-gpg/ [root@localhost rpm-gpg]# ls RPM-GPG-KEY-redhat-beta RPM-GPG-KEY-redhat-legacy-rhx RPM-GPG-KEY-redhat-legacy-former RPM-GPG-KEY-redhat-release RPM-GPG-KEY-redhat-legacy-release [root@localhost rpm-gpg]# cd [root@localhost ~]# mv RPM-GPG-KEY-CentOS-7 /etc/pki/rpm-gpg/
[root@localhost ~]# cd /etc/pki/rpm-gpg/
[root@localhost rpm-gpg]# ls
RPM-GPG-KEY-CentOS-7 RPM-GPG-KEY-redhat-legacy-release
RPM-GPG-KEY-redhat-beta RPM-GPG-KEY-redhat-legacy-rhx
RPM-GPG-KEY-redhat-legacy-former RPM-GPG-KEY-redhat-release
在上述完成之后
[root@localhost ~]# yum clear all [root@localhost ~]# yum makecache
至此所有的配置完成。