回帖：vi /etc/selinux/config关闭linuxse

更换并加载国内yum源
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo #更换阿里云yum源
curl -o /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-7.repo#添加epel源
yum makecache #加载缓存

安装 net-tools 含ifconfig‌

yum install net-tools

4.安装基础组件因为CentOS7是以最小化模式安装的，所以有经验的铁子会发现linux的魅力，Tab键自动补齐功能居然失效了，没关系、安装以下组件便可高效方便实验啦！
yum install yum-utilsbash-completion vim git wget zip tree -y
查看内核版本
uname -r

更新yum
yum update

https://www.zhihu.com/question/25126650/answer/3529138071