I'm using docker-compose v 1.27.4 on Mac. I have this docker-compose.yml file -- two services, a PostGres DB and a Python/Django app ...
services:
postgres:
image: postgres:10.5
ports:
- 5105:5432
environment:
POSTGRES_DB: directory_data
POSTGRES_USER: chicommons
POSTGRES_PASSWORD: password
web:
restart: always
build: ./web
ports: # to access the container from outside
- "8000:8000"
env_file: .env
environment:
DEBUG: 'true'
command: /usr/local/bin/gunicorn directory.wsgi:application --reload -w 2 -b :8000
volumes:
- ./web/:/app
depends_on:
- postgres
This is the Dockerfile used to build the Python/Django container ...
FROM python:3.8-slim
RUN apt-get update && apt-get install
RUN apt-get install -y dos2unix
RUN apt-get install -y libpq-dev python-dev
RUN apt-get install -y python-psycopg2
RUN apt-get install -y libmariadb-dev-compat libmariadb-dev
RUN apt-get update \
&& apt-get install -y --no-install-recommends gcc \
&& rm -rf /var/lib/apt/lists/*
RUN python -m pip install --upgrade pip
WORKDIR /my-app/
COPY requirements.txt requirements.txt
COPY entrypoint.sh entrypoint.sh
RUN python -m pip install -r requirements.txt
RUN dos2unix /my-app/entrypoint.sh
ENTRYPOINT ["bash", "/my-app/entrypoint.sh"]
However, when I start my application using "docker-compose up," I get the below errors
web_1 | Traceback (most recent call last):
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 25, in <module>
web_1 | import psycopg2 as Database
web_1 | ModuleNotFoundError: No module named 'psycopg2'
web_1 |
web_1 | During handling of the above exception, another exception occurred:
web_1 |
web_1 | Traceback (most recent call last):
web_1 | File "manage.py", line 21, in <module>
web_1 | main()
web_1 | File "manage.py", line 17, in main
web_1 | execute_from_command_line(sys.argv)
web_1 | File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
web_1 | utility.execute()
web_1 | File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 377, in execute
web_1 | django.setup()
web_1 | File "/usr/local/lib/python3.8/site-packages/django/__init__.py", line 24, in setup
web_1 | apps.populate(settings.INSTALLED_APPS)
web_1 | File "/usr/local/lib/python3.8/site-packages/django/apps/registry.py", line 114, in populate
web_1 | app_config.import_models()
web_1 | File "/usr/local/lib/python3.8/site-packages/django/apps/config.py", line 211, in import_models
web_1 | self.models_module = import_module(models_module_name)
web_1 | File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
web_1 | return _bootstrap._gcd_import(name[level:], package, level)
web_1 | File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
web_1 | File "<frozen importlib._bootstrap>", line 991, in _find_and_load
web_1 | File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
web_1 | File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
web_1 | File "<frozen importlib._bootstrap_external>", line 783, in exec_module
web_1 | File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
web_1 | File "/usr/local/lib/python3.8/site-packages/django/contrib/auth/models.py", line 2, in <module>
web_1 | from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
web_1 | File "/usr/local/lib/python3.8/site-packages/django/contrib/auth/base_user.py", line 47, in <module>
web_1 | class AbstractBaseUser(models.Model):
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 121, in __new__
web_1 | new_class.add_to_class('_meta', Options(meta, app_label))
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/models/base.py", line 325, in add_to_class
web_1 | value.contribute_to_class(cls, name)
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/models/options.py", line 208, in contribute_to_class
web_1 | self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/__init__.py", line 28, in __getattr__
web_1 | return getattr(connections[DEFAULT_DB_ALIAS], item)
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 207, in __getitem__
web_1 | backend = load_backend(db['ENGINE'])
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 111, in load_backend
web_1 | return import_module('%s.base' % backend_name)
web_1 | File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
web_1 | return _bootstrap._gcd_import(name[level:], package, level)
web_1 | File "/usr/local/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 29, in <module>
web_1 | raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
web_1 | django.core.exceptions.ImproperlyConfigured: Error loading psycopg2 module: No module named 'psycopg2'
I don't understand why I'm seeing this error especially given the fact I have
RUN apt-get install -y python-psycopg2
in my container. What else do I need to install the psycopg2 library?
I don't think you even need to have RUN apt-get install -y python-psycopg2. You already have RUN apt-get install -y libpq-dev.
I think you forgot to put psycopg2==2.8.6 inside your requirements.txt file. Your Dockerfile could change to:
FROM python:3.8-slim
RUN apt-get update && apt-get install
RUN apt-get install -y \
dos2unix \
libpq-dev \
libmariadb-dev-compat \
libmariadb-dev \
gcc \
&& apt-get clean
RUN python -m pip install --upgrade pip
WORKDIR /my-app/
COPY requirements.txt requirements.txt
COPY entrypoint.sh entrypoint.sh
RUN python -m pip install -r requirements.txt
RUN dos2unix /my-app/entrypoint.sh
ENTRYPOINT ["bash", "/my-app/entrypoint.sh"]
And make sure you have this in requirements.txt
psycopg2==2.8.6
Btw, you are using both MariaDB and PostgreSQL in the same project?