查看安装在本机的网卡
nmcli d
一、解决yum问题最有效的方法
https://www.cnblogs.com/xiangshihua/p/13252835.html
二、取消安全验证
https://www.cnblogs.com/patrick-yeh/p/14184489.html
三、解决依赖问题
https://www.cnblogs.com/chenxingyang/p/11158243.html
四、其他参考：
1、阿里镜像源
https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/
2、yum的本质和常见问题
https://blog.csdn.net/rongkai111/article/details/108450697?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-0.no_search_link&spm=1001.2101.3001.4242
3、yum重装
https://blog.csdn.net/qq_42677001/article/details/100068309?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_title~default-0.no_search_link&spm=1001.2101.3001.4242
https://blog.csdn.net/weixin_34258078/article/details/92420912
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/centos-release-7-7.1908.0.el7.centos.x86_64.rpm
rpm -ivh centos-release-7-7.1908.0.el7.centos.x86_64.rpm
4、更新yum镜像源-163
https://www.cnblogs.com/raorao1994/p/9636513.html