yum报错yun.comcentos7.9.2009osx86_64repodatarepomd.xml [Errno 14] curl#6 - Could not resolve h

yum安装报错http://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.aliyun.com; 未知的错误"正在尝试其它镜像。

报错详细

[root@Ability ~]# yum install tree -y
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
http://mirrors.aliyun.com/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.aliyun.com; 未知的错误"
正在尝试其它镜像。
http://mirrors.163.com/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.163.com; 未知的错误"
正在尝试其它镜像。
http://mirrors.ustc.edu.cn/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.ustc.edu.cn; 未知的错误"
正在尝试其它镜像。
http://ftp.sjtu.edu.cn/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: ftp.sjtu.edu.cn; 未知的错误"
正在尝试其它镜像。
http://mirrors.bfsu.edu.cn/centos/7.9.2009/os/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.bfsu.edu.cn; 未知的错误"

解决办法

vim /etc/sysconfig/network-scripts/ifcfg-ens32

#在网卡配置文件下添加下面信息
DNS1=8.8.8.8
DNS2=114.114.114.114

处理结果

http://mirrors.bfsu.edu.cn/centos/7.9.2009/extras/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.bfsu.edu.cn; 未知的错误"
正在尝试其它镜像。
extras                                                                | 2.9 kB  00:00:00
updates                                                               | 2.9 kB  00:00:00
正在解决依赖关系
--> 正在检查事务
---> 软件包 tree.x86_64.0.1.6.0-10.el7 将被 安装
--> 解决依赖关系完成

依赖关系解决

=============================================================================================
 Package            架构                 版本                       源                  大小
=============================================================================================
正在安装:
 tree               x86_64               1.6.0-10.el7               base                46 k

事务概要
=============================================================================================
安装  1 软件包

总下载量：46 k
安装大小：87 k
Downloading packages:
警告：/var/cache/yum/x86_64/7/base/packages/tree-1.6.0-10.el7.x86_64.rpm: 头V3 RSA/SHA256 Signature, 密钥 ID f4a80eb5: NOKEY
tree-1.6.0-10.el7.x86_64.rpm 的公钥尚未安装
tree-1.6.0-10.el7.x86_64.rpm                                          |  46 kB  00:00:00
从 file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7 检索密钥
导入 GPG key 0xF4A80EB5:
 用户ID     : "CentOS-7 Key (CentOS 7 Official Signing Key) <security@centos.org>"
 指纹       : 6341 ab27 53d7 8a78 a7c2 7bb1 24c6 a8a7 f4a8 0eb5
 软件包     : centos-release-7-9.2009.0.el7.centos.x86_64 (@anaconda)
 来自       : /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  正在安装    : tree-1.6.0-10.el7.x86_64                                                 1/1
  验证中      : tree-1.6.0-10.el7.x86_64                                                 1/1

已安装:
  tree.x86_64 0:1.6.0-10.el7

完毕！