Connect postgres with docker and django

To connect PostgreSQL with Docker and Django, follow these steps:

1. Set Up Docker and Docker Compose:
   Make sure Docker and Docker Compose are installed on your machine.

2. Create a Docker Compose File:
   Create a docker-compose.yml file to define the services for Django and PostgreSQL.
   

version: '3.8'

services:
  db:
    image: postgres:13
    environment:
      POSTGRES_DB: mydatabase
      POSTGRES_USER: myuser
      POSTGRES_PASSWORD: mypassword
    volumes:
      - postgres_data:/var/lib/postgresql/data

  web:
    build: .
    command: python manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

volumes:
  postgres_data:

1. Create a Dockerfile for Django: Create a Dockerfile in your Django project root.

# Use the official Python image from the Docker Hub
FROM python:3.9

# Set the working directory in the container
WORKDIR /code

# Copy the requirements file into the container
COPY requirements.txt /code/

# Install the dependencies
RUN pip install -r requirements.txt

# Copy the rest of the application code into the container
COPY . /code/

1. Configure Django to Use PostgreSQL: Update your settings.py in your Django project to use PostgreSQL.

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'mydatabase',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': 'db',
        'PORT': '5432',
    }
}

1. Install Dependencies: Make sure your requirements.txt includes the necessary dependencies.

Django>=3.2,<4.0
psycopg2-binary>=2.8,<3.0

1. Run Docker Compose: Use Docker Compose to build and run your containers.

docker-compose up --build

1. Migrate the Database: Once the containers are running, apply the migrations to set up your PostgreSQL database.

docker-compose exec web python manage.py migrate

1. Create a Superuser (Optional): Create a Django superuser to access the admin panel.

docker-compose exec web python manage.py createsuperuser

Now, you should have a working Django application connected to a PostgreSQL database, both running in Docker containers. You can access your application at http://localhost:8000.

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