Merge pull request #927 from wen-bo-yang/develop_test

support UBUNTU MIRROR and modify doc

Author: wangkuiyi

doc/getstarted/build_and_install/docker_install_en.rst

@@ -39,12 +39,20 @@ The general development workflow with Docker and Bazel is as follows:
    code.  This image contains all the development tools and
    dependencies of PaddlePaddle.
 
-
    .. code-block:: bash
 
       cd paddle
       docker build -t paddle:dev -f paddle/scripts/docker/Dockerfile .
 
+   Sometimes docker build might suffer from a slow network connection to the official Ubuntu apt-source servers. In such case, we can specify an apt-source mirror server that is geologically nearer to us. In the following example, we specified an apt-source server that responds fast in China.You can specify the UBUNTU MIRROR with :code:`--build-arg UBUNTU_MIRROR` like the example below.
+
+   .. code-block:: bash
+
+      docker build \
+       --build-arg UBUNTU_MIRROR="http://mirrors.163.com" \
+       -t paddle:dev \
+       -f paddle/scripts/docker/Dockerfile .
+
 
 3. Run the image as a container and mounting local source code
    directory into the container.  This allows us to change the code on

paddle/scripts/docker/Dockerfile

@@ -2,6 +2,8 @@ FROM ubuntu:14.04
 MAINTAINER PaddlePaddle Authors <[email protected]>
 
 ARG DEBIAN_FRONTEND=noninteractive
+ARG UBUNTU_MIRROR
+RUN /bin/bash -c 'if [[ -n ${UBUNTU_MIRROR} ]]; then sed -i 's#http://archive.ubuntu.com#${UBUNTU_MIRROR}#g' /etc/apt/sources.list; fi'
 RUN apt-get update \
     && apt-get install -y cmake libprotobuf-dev protobuf-compiler git \
     libgoogle-glog-dev libgflags-dev libgtest-dev \

paddle/scripts/docker/Dockerfile.gpu

@@ -2,6 +2,8 @@ FROM nvidia/cuda:7.5-cudnn5-devel-ubuntu14.04
 MAINTAINER PaddlePaddle Authors <[email protected]>
 
 ARG DEBIAN_FRONTEND=noninteractive
+ARG UBUNTU_MIRROR
+RUN /bin/bash -c 'if [[ -n ${UBUNTU_MIRROR} ]]; then sed -i 's#http://archive.ubuntu.com#${UBUNTU_MIRROR}#g' /etc/apt/sources.list; fi'
 RUN apt-get update \
     && apt-get install -y cmake libprotobuf-dev protobuf-compiler git \
     libgoogle-glog-dev libgflags-dev libgtest-dev \