解决 dns解析问题在liunx上

无法连接服务器：yum

vi /etc/yum.repos.d/CentOS-Base.repo

将下边的修改成现在的

[base]

name=CentOS-$releasever - Base

baseurl=https://mirrors.aliyun.com/centos/$releasever/os/$basearch/

gpgcheck=1

gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[updates]

name=CentOS-$releasever - Updates

baseurl=https://mirrors.aliyun.com/centos/$releasever/updates/$basearch/

gpgcheck=1

gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[extras]

name=CentOS-$releasever - Extras

baseurl=https://mirrors.aliyun.com/centos/$releasever/extras/$basearch/

gpgcheck=1

gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

[centosplus]

name=CentOS-$releasever - Plus

baseurl=https://mirrors.aliyun.com/centos/$releasever/centosplus/$basearch/

gpgcheck=1

enabled=0

gpgkey=https://mirrors.aliyun.com/centos/RPM-GPG-KEY-CentOS-7

出现GPG密钥问题：

vi /etc/yum.repos.d/CentOS-Base.repo

将 gpgcheck=1 给为gpgcheck=0即可。

就可以解决上不了服务器的问题和下载不了数据包的问题。

我也还不知道怎么回事！

有懂的请大佬解释一下！