Solution

.dockerignore

@@ -0,0 +1,8 @@
+.git
+__pycache__
+*.pyc
+venv
+.env
+db.sqlite3
+static
+media

Dockerfile

@@ -0,0 +1,35 @@
+FROM python:3.12-slim
+LABEL maintainer="your_email@example.com"
+
+ENV PYTHONUNBUFFERED 1
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libpq-dev \
+    bash \
+    gosu \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    libc6-dev \
+    && pip install --no-cache-dir -r requirements.txt \
+    && apt-get purge -y --auto-remove gcc libc6-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN adduser --disabled-password --no-create-home --shell /bin/bash django-user && \
+    mkdir -p /vol/web/media /vol/web/static && \
+    chown -R django-user:django-user /vol && \
+    chmod -R 755 /vol
+
+COPY . .
+RUN chown -R django-user:django-user /app
+
+COPY ./scripts/entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

cinema/management/commands/wait_for_db.py

@@ -0,0 +1,29 @@
+import time
+from django.db import connections
+from django.db.utils import OperationalError
+from django.core.management.base import BaseCommand, CommandError
+
+
+class Command(BaseCommand):
+    def handle(self, *args, **options):
+        self.stdout.write("Waiting for database...")
+        attempts = 0
+        max_attempts = 20
+
+        while attempts < max_attempts:
+            try:
+                db_conn = connections["default"]
+                db_conn.cursor()
+                self.stdout.write(self.style.SUCCESS(
+                    f"Database available after {attempts + 1} attempt(s)!"
+                ))
+                return
+            except OperationalError:
+                attempts += 1
+                self.stdout.write(
+                    f"Database unavailable "
+                    f"(attempt {attempts}/{max_attempts}), waiting 1s..."
+                )
+                time.sleep(1)
+
+        raise CommandError("Database unavailable after maximum attempts.")

cinema_service/settings.py

@@ -1,18 +1,19 @@
 """
 Django settings for cinema_service project.
 
-Generated by 'django-admin startproject' using Django 4.0.4.
+Generated by "django-admin startproject" using Django 4.0.4.
 
 For more information on this file, see
 https://docs.djangoproject.com/en/4.0/topics/settings/
 
 For the full list of settings and their values, see
 https://docs.djangoproject.com/en/4.0/ref/settings/
 """
+import os
 from datetime import timedelta
 from pathlib import Path
 
-# Build paths inside the project like this: BASE_DIR / 'subdir'.
+# Build paths inside the project like this: BASE_DIR / "subdir".
 BASE_DIR = Path(__file__).resolve().parent.parent
 
 
@@ -24,10 +25,10 @@
     "django-insecure-6vubhk2$++agnctay_4pxy_8cq)mosmn(*-#2b^v4cgsh-^!i3"
 )
 
-# SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = True
+# SECURITY WARNING: don"t run with debug turned on in production!
+DEBUG = os.getenv("DEBUG", "False") == "True"
 
-ALLOWED_HOSTS = []
+ALLOWED_HOSTS = os.getenv("ALLOWED_HOSTS", "127.0.0.1,localhost").split(",")
 
 INTERNAL_IPS = [
     "127.0.0.1",
@@ -86,12 +87,22 @@
 
 DATABASES = {
     "default": {
-        "ENGINE": "django.db.backends.sqlite3",
-        "NAME": BASE_DIR / "db.sqlite3",
+        "ENGINE": "django.db.backends.postgresql",
+        "NAME": os.getenv("DB_NAME", "cinema"),
+        "USER": os.getenv("DB_USER", "postgres"),
+        "PASSWORD": os.getenv("DB_PASS", "postgres"),
+        "HOST": os.getenv("DB_HOST", "db"),
+        "PORT": os.getenv("DB_PORT", "5432"),
     }
 }
 
 
+STATIC_URL = "/static/"
+MEDIA_URL = "/media/"
+
+STATIC_ROOT = "/vol/web/static"
+MEDIA_ROOT = "/vol/web/media"
+
 # Password validation
 # https://docs.djangoproject.com/en/4.0/ref/settings/#auth-password-validators
 
@@ -131,10 +142,6 @@
 # Static files (CSS, JavaScript, Images)
 # https://docs.djangoproject.com/en/4.0/howto/static-files/
 
-STATIC_URL = "static/"
-
-MEDIA_URL = "/media/"
-MEDIA_ROOT = BASE_DIR / "media"
 
 # Default primary key field type
 # https://docs.djangoproject.com/en/4.0/ref/settings/#default-auto-field

docker-compose.yml

@@ -0,0 +1,33 @@
+version: "3.8"
+
+services:
+  db:
+    image: postgres:15-alpine
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_DB=cinema
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+
+  app:
+    build: .
+    ports:
+      - "8000:8000"
+    volumes:
+      - media_data:/vol/web/media
+      - static_data:/vol/web/static
+    environment:
+      - DB_HOST=db
+      - DB_NAME=cinema
+      - DB_USER=postgres
+      - DB_PASS=postgres
+      - ALLOWED_HOSTS=127.0.0.1,localhost
+      - DEBUG=False
+    depends_on:
+      - db
+
+volumes:
+  postgres_data:
+  media_data:
+  static_data:

requirements.txt

@@ -8,3 +8,4 @@ djangorestframework
 djangorestframework-simplejwt
 drf-spectacular
 Pillow
+psycopg2-binary>=2.9.9

scripts/entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+
+chown -R django-user:django-user /vol/web
+
+exec gosu django-user python manage.py wait_for_db && \
+     python manage.py migrate && \
+     python manage.py collectstatic --no-input && \
+     python manage.py runserver 0.0.0.0:8000