I have encountered a problem while trying to run my django project on a new Docker container. It is my first time using Docker and I can't seem to find a good way to run a django project on it. Having tried multiple tutorials, I always get the error about psycopg2 not being installed.
requirements.txt:
-i https://pypi.org/simple
asgiref==3.2.7
django-cors-headers==3.3.0
django==3.0.7
djangorestframework==3.11.0
gunicorn==20.0.4
psycopg2-binary==2.8.5
pytz==2020.1
sqlparse==0.3.1
Dockerfile:
# pull official base image
FROM python:3.8.3-alpine
# set work directory
WORKDIR /usr/src/app
# set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
# install dependencies
RUN pip install --upgrade pip
COPY ./requirements.txt .
RUN pip install -r requirements.txt
# copy project
COPY . .
# set project environment variables
# grab these via Python's os.environ
# these are 100% optional here
ENV PORT=8000
ENV SECRET_KEY_TWITTER = "***"
While running docker-compose build, I get the following error:
Error: pg_config executable not found.
pg_config is required to build psycopg2 from source. Please add the directory
containing pg_config to the $PATH or specify the full executable path with the
option:
python setup.py build_ext --pg-config /path/to/pg_config build ...
or with the pg_config option in 'setup.cfg'.
If you prefer to avoid building psycopg2 from source, please install the PyPI
'psycopg2-binary' package instead.
I will gladly answer any questions that might lead to the solution. Also, maybe someone can recommend me a good tutorial on dockerizing django apps?
On Alpine Linux, you will need to compile all packages, even if a pre-compiled binary wheel is available on PyPI. On standard Linux-based images, you won't (https://pythonspeed.com/articles/alpine-docker-python/ - there are also other articles I've written there that might be helpful, e.g. on security).
So change your base image to python:3.8.3-slim-buster or python:3.8-slim-buster and it should work.