在docker所在环境，如centos执行：
1、修改resolv.conf
vim /etc/resolv.conf
修改原来nameserver
nameserver 8.8.8.8
2、重启docker
service docker restart
进入容器中：
执行测试
curl www.baidu.com
Docker中使用git clone 报错 Could not resolve host: github.com； Unknown error
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