shenoyrahul444/epr-rev

Sources: https://semaphoreci.com/community/tutorials/dockerizing-a-python-django-web-application

1> Building the Application

Starting the application

> python manage.py runserver

To create admin

> python manage.oy createsuperuser

To Delete admin

> python manage.py shell
> from django.contrib.auth.models import User
> User.objects.get(username="rahul",is_superuser = True).delete()

To access models/Table in the admin:

Go to app/admin.py and Register the models for that app

Migrations ()

1> For Models.py
2> For Admin


> python manage.py makemigrations (# To commit changes in models)
> python manage.py migrate (# To Migrate all the changes)

> python manage.py makemigrations blog (# For a particular app)
> python manage.py sqlmigration blog 0001

2> Deployment

We'll be dockerizing the Django App so it can take advantage of distributed storage and network

1> Creating Requirements.txt in root
    Django==2.1.3
    gunicorn==19.6.0

# Gunicorn web server is built to handle production levels of traffic, unlike Django's development server(suitable for local development)
2> Creating Virtual environment 'venv' and activating it
    > python3 -m venv venv
    > source venv/bin/activate

3> Installing the requirements using pip
    > pip install -r requirements.txt    


4> Add 'start.sh' bash script to root (Startup script for Docker to execute) 

    #!/bin/bash

    # Start Gunicorn processes
    echo Starting Gunicorn.
    exec gunicorn helloworld.wsgi:application \
        --bind 0.0.0.0:8000 \
        --workers 3

5> Testing if start.sh works
    > chmod +x start.sh
    > cd EPR
    > ../start.sh
    
    # This should run the application on the guinicorn web server

Dockerizing the applcation

6> Create Dockerfile in the root 
    
    # Dockerfile
    
    # FROM directive instructing base image to build upon
    FROM python:2-onbuild
    
    # COPY startup script into known file location in container
    COPY start.sh /start.sh
    
    # EXPOSE port 8000 to allow communication to/from server
    EXPOSE 8000
    
    # CMD specifcies the command to execute to start the server running.
    CMD ["/start.sh"]
    # done!
    
7> Building and Running the Container
    
    > docker build -t shenoy/epr .
    
    > docker run -it -p 8000:8000 shenoy/epr