內網環境更新了yum源為阿里源后，yum makecache報錯報錯如下：
解決辦法：
網上查了下，都說是DNS解析的問題，但這里DNS解析都有配置的，后來重新嘗試發現
因為是內網環境，雖然已經配置了系統代理，但是yum可能不走系統代理，需要單獨給yum配置代理，處理如下：
$ vi /etc/yum.conf 添加如下內容： proxy=http://192.168.11.2:3100
linux centos使用yum makecache報錯 [Errno 14] curl#6 - "Could not resolve host: mirrors.aliyun.com; 未知的錯誤"
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https://mirrors.aliyun.com/centos/7/isos/x86_64/CentOS-7-x86_64-Everything-2003.iso