Dockerfile

Dockerfile

# maybe it's expected I mention to use alpine here. I don't think so (can
# explain).
FROM ubuntu:18.04

# avoid "upgrade", as many of the “essential” packages cannot upgrade inside an
# unprivileged container. if there is a particular package, that needs to be
# updated, use `apt-get install -y foo` to update automatically.
#RUN apt-get upgrade

# sort multi-line arguments alphanumerically. this helps to avoid duplication of
# packages and makes the list much easier to update.
# Always combine `apt-get update` with `apt-get install`, otherwise it causes
# caching issues and subsequent `apt-get install` instructions fail.
RUN apt-get update && apt-get install -y --no-install-recommends build-essential \
    libglib2.0-0 \
    libpq-dev \
    tzdata \
# clean up the apt cache by removing /var/lib/apt/lists. it reduces the image
# size, since the apt cache is not stored in a layer.
&& rm -fr /var/lib/apt/lists/*

# copy requirements.txt only instead of copying the whole directory.
#COPY ./ /repo/
COPY requirements.txt /repo
COPY requirements_deploy.txt /repo

# install python requirements
RUN pip3 install --upgrade pip==19.3.1
RUN pip3 install -r /repo/requirements.txt
RUN pip3 install -r /repo/requirements_deploy.txt
# set timezone correctly
# can be ok, but there are ways of adding "TZ" variable, or using volumes.
RUN ln -fs /usr/share/zoneinfo/Europe/Berlin /etc/localtime
RUN dpkg-reconfigure --frontend noninteractive tzdata

# versioning must be used widely, as much as possible. pip requirements files
# must contain not just software, but sticked with versions. `apt-get install`,
# too.
# if do COPY of folders, use .dockerignore to scope out folders like ".git" and
# other "garbage".