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问题描述：
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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，报了如下错误：
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/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host \"Trying other mirror.http://mirrors./centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host mirrors.\"Trying other mirror.http://mirrors./centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host mirrors.\"Trying other mirror.http://mirrors./centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host mirrors.\"Trying other mirror./centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host \"Trying other mirror.http://mirrors.tuna./centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host mirrors.tuna.\"Trying other mirror.http://mirrors./centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn resolve host mirrors.\"Trying other mirror.
解决过程：
1、测试wget
wget /.help/CentOS6-Base-163.repo
结果报错
unknown host
2、测试ping
在容器内部
ping
结果还是失败
ping: unknown host
多开一个终端，进入主机（不是进入容器），进行ping命令测试发现是OK的，基本可以确定是docker的问题了，而不是网络问题。
解决方法：
停止所有容器，重启docker即可。
service docker restart
完成！
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