docker容器ping不通外網

背景 今天在docker搭建redis環境的時候，發現yum拉取不到資源，上不到網，報了以下錯誤web http://mirrors.aliyun.com/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirror

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