linux配置网络yum源

装完redhat 7，yum下载wget报错，费了半天事找到解决办法，网上的办法很烂，说让我卸载yum,一点不靠谱

This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
没有已启用的源。
执行 "yum repolist all" 查看您拥有的源。
您可以用 yum-config-manager --enable <源名> 来启用源

发现/etc/yum.repos.d目录下没有文件

在其目录下新建一个文件163.repo

vi 163.repo

把下面内容复制进去，保存退出

[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.163.com/centos/7/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates
baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7
[extras]
name=CentOS-$releasever - Extras
baseurl=http://mirrors.163.com/centos/7/extras//$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://mirrors.163.com/centos/7/centosplus//$basearch/
gpgcheck=1
enabled=0

执行 yum list,问题解决