docker容器无法ping外网

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：

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 'mirrors.aliyun.com'"
Trying other mirror.
http://mirrors.neusoft.edu.cn/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.neusoft.edu.cn'"
Trying other mirror.
http://mirrors.nwsuaf.edu.cn/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.nwsuaf.edu.cn'"
Trying other mirror.
http://mirrors.shu.edu.cn/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.shu.edu.cn'"
Trying other mirror.
http://mirrors.sohu.com/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.sohu.com'"
Trying other mirror.
http://mirrors.tuna.tsinghua.edu.cn/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.tuna.tsinghua.edu.cn'"
Trying other mirror.
http://mirrors.zju.edu.cn/centos/6.10/extras/x86_64/Packages/epel-release-6-8.noarch.rpm: [Errno 14] PYCURL ERROR 6 - "Couldn't resolve host 'mirrors.zju.edu.cn'"
Trying other mirror.

测试wget

wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

结果报错

unknown host mirrors.163.com

测试ping

在容器内部
ping www.baidu.com

结果还是失败

网梦购物系统

一套功能完善、性能稳定的经典网上购物系统，掌握了一整套从算法，数据结构到产品安全性方面的领先技术，使程序无论在安全性、负载能力方面均获得了成功，新版购物系统集成多种在线支付方式，全后台操作管理，并集成了Ewebedit编辑器，即使只有电脑基础知识的人也能够轻松操作和管理部分新增功能：集成多种网上支付形式，后台灵活切换增加Ewebedit编辑器，添加信息更容易！简洁、明快、新颖的界面，给人以美的感觉

下载

ping: unknown host www.baidu.com

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

service docker restart

更多相关教程，请关注PHP中文网docker教程栏目。