docker容器ping不通外网

背景 今天在docker搭建redis环境的时候，发现yum拉取不到资源，上不到网，报了以下错误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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