Python 2.7 minimal Docker image (with psycopg2, nginx and supervisor)

Dockerfile

FROM debian:jessie
ENV PYENV_ROOT=/opt/pyenv PATH=/opt/pyenv/shims:/opt/pyenv/bin:$PATH LANG=en_US.UTF-8
RUN set -x \
    && echo "LANG=$LANG" > /etc/default/locale \
    && echo "$LANG UTF-8" > /etc/locale.gen \
    && export DEBIAN_FRONTEND=noninteractive \
    && apt-get update -qq \
    && apt-get install -y locales \
    && apt-get install -y \
        libpq5 \
        nginx-light \
    && BUILD_DEPS='build-essential curl git-core zlib1g-dev libssl-dev libbz2-dev libreadline-dev libpq-dev' \
    && apt-get install -y ${BUILD_DEPS} \

    && PYTHON_VERSION=2.7.11 \
    && curl --silent --show-error --retry 5 https://raw.githubusercontent.com/yyuu/pyenv-installer/master/bin/pyenv-installer | bash \
    && pyenv update \
    && pyenv install ${PYTHON_VERSION} && pyenv global ${PYTHON_VERSION} \
    && rm -rf ${PYENV_ROOT}/plugins \
    && pip install --upgrade pip && pip --version \
    && pip install \
        psycopg2==2.6.1 \
        supervisor==3.2.3 \

    && apt-get autoremove -y ${BUILD_DEPS} \
    && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

The key to minimify image is to remove all build dependencies in the same step. The result is 282.5 Mb

Build dependencies:

• It's a good practice to install exact Python, use pyenv for it;
• There are a lot of packages you have to install to build python, they are listed in BUILD_DEPS. And you should remove them after build.

About runtime dependencies:

• libpq5 is required for psycopg2 (if you use PostgreSQL for you app);
• nginx-light vs nginx-full is 1Mb vs _50Mb_6 sj use first;
• I use supervisor as init process for my containers, you should install it using pip to do not install extra system dependencies.