failure: repodata/repomd.xml 和 Loaded plugins: fastestmirror 问题解决_loaded plugins: fastestmirror, langpacks file cont

想用:

yum install screen
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结果报错：

failure: repodata/repomd.xml from epel: [Errno 256] No more mirrors to try.
http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 14] curl#6 - "Could not resolve host: mirrors.tencentyun.com; No address associated with hostname"
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以及

Loaded plugins: fastestmirror, langpacks 
File contains no section headers. file: file:///etc/yum.r
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网上搜了很多，找到了个靠谱答案：
1、删掉旧的

rm -rf /etc/yum.repos.d/CentOS-*
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2、下载国内源

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo  
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3、清理缓存

yum clean all
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4、

yum makeache
yum update
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完成，可以继续安装screen了！

参考：

https://blog.csdn.net/qq_40996741/article/details/108457206