apt-get在公司代理后面的docker中

我正在尝试使用Docker在公司代理服务器后面设置开发环境.尽我所能,我无法让docker容器与代理服务器通信.

代理服务器和apt-get在主机上工作正常,即Ubuntu 12.04

在Dockerfile中完成的第一件事是尝试设置代理变量：

FROM ubuntu
RUN echo 'Acquire::http { Proxy "http://my.proxy.net:8000"; };' >> /etc/apt/apt.conf.d/01proxy
ENV HTTP_PROXY http://my.proxy.net:8000
ENV http_proxy http://my.proxy.net:8000
ENV HTTPS_PROXY https://my.proxy.net:8000
ENV https_proxy https://my.proxy.net:8000
RUN apt-get update && apt-get install -y build-essential

它将图像拉得很好,设置了变量,但是当它进入apt-get update时,它会尝试一段时间然后失败并：

W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-security/InRelease  
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty/Release.gpg  Could not resolve 'my.proxy.net'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-updates/Release.gpg  Could not resolve 'my.proxy.net'
W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/trusty-security/Release.gpg  Could not resolve 'my.proxy.net'
W: Some index files failed to download. They have been ignored,or old ones used instead.

我设置的这些变量与主机linux安装一致(VirtualBox上的Ubuntu 12.04,如果重要的话)

我还有/ etc / default / docker设置：

export http_proxy="http://my.proxy.net:8000"
export http_proxy="https://my.proxy.net:8000"

有什么想法吗？

更新：

看起来这是DNS的问题,不一定是代理服务器.主机/etc/resolve.conf包含：

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1
search dhcp.mycompany.com

主机是在Windows 7机器上运行的虚拟机vm,我发现了大多数似乎不起作用的各种半生不熟的解决方案.无论我尝试什么,我都无法解决代理服务器的主机名