在用yum安装装软件或者使用curl的时候会出现这个错误
原因：
1、你的镜像源被墙了
2、你的网络配置有问题
3、也有可能是DNS服务器的问题我就是网卡配置的时候把DNS1=114.114.114.114写成了DNS!=114.114.114.114
没错就是把“1”写成了感叹号（“!”），🤮了
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