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Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 - "Couldn‘t resolve host ‘mirrorlist.centos.org‘"
Error: Cannot find a valid baseurl for repo: base
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解决方法：
修改DNS配置
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原文地址：http://www.cnblogs.com/bluewelkin/p/4353152.html
