ubuntu - Building a docker file with apt-get behind a proxy -

i'm trying run apt-get -y install python while behind proxy shown in dockerfile below:

from ubuntu:16.04  run \   http_proxy=http://exampleproxy.com:80 \   apt-get -y update && \   http_proxy=http://exampleproxy.com:80 \   apt-get install -y python python-dev python-pip python-virtualenv  run \   http_proxy=http://exampleproxy.com:80 \   rm -rf /var/lib/apt/lists/*  run pip install --upgrade pip --proxy=http://emea-proxy.uk.oracle.com:80  add . /code  workdir /code  run pip install -r requirements.txt --proxy=http://exampleproxy.com:80  entrypoint ["python", "python_file.py"] 

i have specify proxy twice in first run, because proxy doesn't carry on apt-get install otherwise.

i can't use env affects program (it runs/gets files within proxy , download incorrectly if specify proxies environment variables).

when try building file error:

unable fetch archives, maybe run apt-get update or try --fix-missing? command [...]returned non-zero code: 100 

i have taken consideration docker layer caching , use --no-cache while building image. apt-get update should run every time.

thanks reading :)