A memo about building a Django (Python) application with Docker

Introduction

• I wanted to learn Python and Django web frameworks, but I decided to launch them in a virtual environment because the environment construction was complicated.
• Basically, it is as per the official page of Docker, but if you write it as officially, an error will occur, so some corrections have been made.
• Officially Django x Postgres configuration

environment

• Docker on Mac

Postscript

• Corrected 2020/9/22 command

Procedure (preparation and start-up)

Create and move a directory for your project. Here, we will proceed with the application name linebot.

MacBook-Air ~ % mkdir jinolinebot
MacBook-Air ~ % cd jinolinebot
MacBook-Air jinolinebot % 

Create a Dockerfile and open it in an editor.

MacBook-Air jinolinebot % touch Dockerfile

Edit and save the Dockerfile.

Dockerfile

FROM python:3
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
ADD requirements.txt /code/
RUN pip install -r requirements.txt
ADD . /code/

Create requirements.txt and edit it as follows

MacBook-Air jinolinebot % touch requirements.txt

requirements.txt

Django>=1.8,<2.0
psycopg2

Create docker-compose.yml and edit it as follows

MacBook-Air jinolinebot % touch docker-compose.yml

docker-compose.yml

version: '3'

services:
  db:
    image: postgres
    environment:
      - POSTGRES_DB=postgres
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
  web:
    build: .
    command: python3 manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

Now that the three files are ready, launch the app.

MacBook-Air jinolinebot % docker-compose run web django-admin startproject app name.
Creating network "jinolinebot_default" with the default driver
Building web
Step 1/7 : FROM python:3
 ---> 28a4c88cdbbf
~
Creating jinolinebot_db_1 ... done
Creating jinolinebot_web_run ... done

After starting up, the next step is to set up the connection to the database. Edit the configuration file generated by the previous command as follows and save it.

app name/settings.py

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

Launch the container, and when the following display is displayed first, access http://0.0.0.0:8000/

MacBook-Air jinolinebot % docker-compose up
~
Starting development server at http://0.0.0.0:8000/
web_1  | Quit the server with CONTROL-C.

It worked! If you see Congratulations on your first Django-powered page.

Created docker file

https://github.com/yongjugithub/djangodocker

References

https://docs.docker.jp/compose/django.html#id2