解决yum联网问题

亲测有效：删除原来的yum，安装新的yum

# 查看原有yum
rpm -qa yum

# 卸载原有yum
rpm -qa | grep yum | xargs rpm -e --nodeps

# 查看原有yum
rpm -qa yum

# 下载新yum
cd download
wget -c https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm
wget -c https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget -c https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm

# 安装新yum
rpm -ivh yum-*  
yum makecache

# 查看新yum
rpm -qa yum

# 导入证书（可有可无）
rpm --import https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/

# 尝试安装htop
yum install -y htop

　　

 

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