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dockerhttp-proxy

Use proxy inside a Docker container

My host server need a proxy to talk to the outside world. It's defined in env like http_proxy=http://10.10.123.123:8080 https_proxy=http://10.10.123.123:8080. I run an image tensorflow/tensorflow, container named tf1.

Inside tf1(by exec into the container), I would like to install some package like grpcio and tensorflow-serving-api with pip, but fail with network error.

How can I use the proxy of the host inside the container? I have tried exec with -e option but fail because of low version docker, so I don't know whether it works.

OS: CentOS 7.2, Docker:1.12.3

Solution

  • Helped for me to export the proxy settings in the same RUN instruction just before the apt-get in Dockerfile

    FROM ubuntu

RUN export "http_proxy=http://host:port" \
    && export "https_proxy=http://host:port" \
    && apt-get update \
    && apt-get install -y SOME-PACKAGE

    After that Ubuntu system in container was able to install the packages.

    The noted way makes the proxy available only for this RUN instruction.

    If the whole image should use the proxy the ENV instruction should be used:

    FROM ubuntu

ENV http_proxy http://host:port
ENV https_proxy http://host:port

RUN apt-get update \
    && apt-get install -y SOME-PACKAGE

ENTRYPOINT [ "printenv" ]

    Building the image $ docker image build -t test . and running the container $ docker run test will show that the proxy persist

    PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
HOSTNAME=8513fc1fb635
http_proxy=http://host:port
https_proxy=http://host:port
HOME=/root