Solution#1013
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Review Summary
Your Dockerization implementation has three critical blockers that will prevent the application from running successfully. First, the empty ALLOWED_HOSTS in settings.py will cause Django 4.0+ to reject all HTTP requests - you must add at least '127.0.0.1' and 'localhost' to allow access at http://127.0.0.1:8000. Second, the .dockerignore file incorrectly excludes Dockerfile and docker-compose.yaml from the build context - these files are essential for Docker to build the image, so remove them from .dockerignore. Third, the db service volume mount uses $PGDATA which is never defined as an environment variable - either add environment: PGDATA: /var/lib/postgresql/data to the db service in docker-compose, or use the direct path my_db:/var/lib/postgresql/data instead of my_db:$PGDATA. Additionally, fix the .dockerignore path syntax by removing leading slashes from paths (use .venv/ instead of /.venv/). Medium priority: consider adding a healthcheck to the db service with condition: service_healthy for more robust startup orchestration.
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Footnotes
| # Generated by Django 6.0.4 on 2026-04-25 06:03 | ||
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| import django.db.models.deletion | ||
| from django.conf import settings |
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Dockerfile and docker-compose.yaml are incorrectly listed in .dockerignore. These files are needed for the Docker build context and should not be excluded. Remove these lines.
| name='actors', | ||
| field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.actor'), | ||
| ), | ||
| migrations.AlterField( | ||
| model_name='movie', | ||
| name='genres', | ||
| field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.genre'), | ||
| ), | ||
| migrations.AlterField( | ||
| model_name='moviesession', |
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The db service is missing a volumes mount for the database data directory. Add volumes: - my_db:/var/lib/postgresql/data to ensure database data persists between container restarts.
| field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.genre'), | ||
| ), | ||
| migrations.AlterField( | ||
| model_name='moviesession', |
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ALLOWED_HOSTS is empty, which will cause Django to reject requests when running in Docker. Add '0.0.0.0' and 'localhost' to ALLOWED_HOSTS in settings.py, or use an environment variable.
| migrations.AlterField( | ||
| model_name='movie', | ||
| name='actors', | ||
| field=models.ManyToManyField(blank=True, related_name='movies', to='cinema.actor'), |
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Using fixed PostgreSQL version '16.0-alpine3.17' prevents automatic security updates. Use a floating tag like '16-alpine' or 'latest' instead.
| import time | ||
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| from django.core.management.base import BaseCommand |
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The .dockerignore file excludes Dockerfile and docker-compose.yaml from the build context. This will cause Docker to fail because the build process needs the Dockerfile to build the image.
| @@ -0,0 +1,4 @@ | |||
| /.venv/ | |||
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Empty ALLOWED_HOSTS list will cause Django to reject requests to 127.0.0.1:8000. In Django 4.0+, even with DEBUG=True, you must explicitly list allowed hosts. Add '127.0.0.1' to the ALLOWED_HOSTS list in settings.py to allow access at http://127.0.0.1:8000/api/.
| - my_db:$PGDATA | ||
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| volumes: | ||
| my_db: |
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Empty ALLOWED_HOSTS will cause Django to reject all HTTP requests. According to the task requirements, you need to access the project at 127.0.0.1:8000/api/. In Django 4.0+, you must explicitly list allowed hosts. Add 'localhost' and '127.0.0.1' to ALLOWED_HOSTS, or use an environment variable like: ALLOWED_HOSTS = os.environ.get('DJANGO_ALLOWED_HOSTS', 'localhost 127.0.0.1').split()
| env_file: | ||
| - .env | ||
| volumes: | ||
| - my_db:$PGDATA |
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The db service mounts a volume using $PGDATA environment variable (my_db:$PGDATA), but PGDATA is never set as an environment variable in the docker-compose file. This means the volume will be mounted to an empty/null path. Either set environment: PGDATA: /var/lib/postgresql/data or use a direct path like my_db:/var/lib/postgresql/data.
| - db | ||
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| db: | ||
| image: postgres:16.0-alpine3.17 |
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The PostgreSQL image tag '16.0-alpine3.17' has an unusual format. For the postgres image, the tag typically follows the pattern '16-alpine' (version-os). The '16.0' and '3.17' format is non-standard and may not exist or could cause unexpected behavior. Use '16-alpine' or 'latest-alpine' instead.
| import os | ||
| from datetime import timedelta | ||
| from pathlib import Path | ||
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The depends_on directive only waits for the db container to start, not for PostgreSQL to be fully initialized and ready to accept connections. The wait_for_db command mitigates this, but adding a healthcheck to the db service with condition: service_healthy would provide more robust service orchestration.
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