[PYTHON] Hello world instead of localhost in Django

Introduction

I have it installed on Google Cloud Platform when I work. In Django's Hello World, I think that it is often done on localhost, but it is written to describe the flow of deployment. As a premise, it is assumed that Draw hello world with mod_wsgi is performed. (Because mod_wsgi is required)

environment OS: Debian 9.0 stretch Python: 3.6.3

Django installation

I will install it immediately. It is assumed that Python is already installed. First, upgrade pip and install Django.

pip install --upgrade pip
pip install django

... is it really installed? Type the following in order.

python
>>> import django
>>> django.get_version()
'2.1.5'

If you can confirm the version like this, the installation is successful. Then type `quit ()` to exit python mode.

Create a Django project

Go to your home directory and create a Django Project. (It doesn't have to be your home directory)

cd ~
django-admin startproject myproject

This will create a Django project directly under your HOME directory.

Change the apache2 configuration file

Modify the apache2 configuration file (sites-available / 000-default.conf) so that wsgi.py in Django responds to access to the document root.

cd /etc/apache2/sites-available
sudo vim 000-default.conf

documentrootComment out(Like this →# documentroot /var/www/html)please. If you have set `WSGIScriptAlias``` in [Draw hello world with mod_wsgi](http://qiita.com/shigechioyo/items/2b25f60918be6b81581a), please delete it as well. Then add the following: Don't forget to change the USERNAME part By the way, in vim you can replace it with `:% s / USERNAME / YOURNAME / g```.

WSGIScriptAlias / /home/USERNAME/myproject/myproject/wsgi.py
WSGIPythonPath /home/USERNAME/myproject

<Directory /home/USERNAME/myproject/myproject>
    <Files wsgi.py>
    Order deny,allow
    AllowOverride None
    require all granted
    </Files>
</Directory>

Modify settings.py in the django config file

As the file name suggests, change the settings related to Django. Here we edit the file with vim.

cd ~/myproject/myproject
vim settings.py

First, we need to set the hosts that can be accessed, so change ALLOWED_HOSTS = [].

ALLOWED_HOSTS = ["*"]

Then change the language and time settings.

LANGUAGE_CODE = 'ja'

TIME_ZONE = 'Asia/Tokyo'

Create a Django Application

So far, you've created a Django project. Next, create a Django application. Use manage.py as usual.

cd ~/myproject
python manage.py startapp myapp

Then, the following hierarchical structure should be completed.

myproject
  |
  ├── myapp
  │     ├── __init__.py
  │     ├── admin.py
  │     ├── apps.py
  │     ├── migrations
  │     │   └── __init__.py
  │     ├── models.py
  │     ├── tests.py
  │     └── views.py
  ├── db.sqlite3
  ├── manage.py
  └── myproject
      ├── __init__.py
      ├── settings.py
      ├── urls.py
      └── wsgi.py

Next, edit settings.py to make the myapp`` application recognized.

cd ~/myproject/myproject
vim settings.py

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp'
]

By adding myapp in this way, the created application will be recognized.

Edit views.py

Create the drawing part of the screen. Editing views.py in the myapp folder.

cd ~/myproject/myapp
vim views.py

from django.shortcuts import render
from django.http import HttpResponse

def home(request):
    return HttpResponse("Hello, Django World")

Edit urls.py

Create the logic for which view to return for the client-side request url.

cd ~/myproject/myproject
vim urls.py

from django.contrib import admin
from django.urls import path
from myapp.views import home

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', home),
]

Finally restart apache2.

sudo service apache2 restart

This should draw * Hello Django World *. Next, I plan to change the database to PostgreSQL.