Django and Python 3 in Amazon Lightsail

sudo apt-get update
sudo apt-get install python3-pip python3-dev libpq-dev postgresql postgresql-contrib nginx

sudo -u postgres psql

- paste this code in postgres console:
CREATE DATABASE django_project;
CREATE USER username WITH PASSWORD 'pass1234';
ALTER ROLE username SET client_encoding TO 'utf8';
ALTER ROLE username SET default_transaction_isolation TO 'read committed';
ALTER ROLE username SET timezone TO 'UTC';
GRANT ALL PRIVILEGES ON DATABASE django_project TO username;
\q

sudo pip3 install virtualenv
mkdir ~/django_project
cd ~/django_project
virtualenv env
source env/bin/activate

pip install django gunicorn psycopg2
django-admin.py startproject django_project .
nano django_project/settings.py

- add your Amazon Lightsail IP to the ALLOWED_HOSTS variable, example:

ALLOWED_HOSTS = ['YOUR_AMAZON_LIGHTSAIL_IP']

- add database configuration:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': 'django_project',
        'USER': 'username',
        'PASSWORD': 'pass1234',
        'HOST': 'localhost',
        'PORT': '',
    }
}

- add static root to the end of the settings:
STATIC_ROOT = os.path.join(BASE_DIR, 'static/')

- save the settings.py file

cd ~/django_project
./manage.py makemigrations
./manage.py migrate
./manage.py createsuperuser
./manage.py collectstatic

sudo ufw allow 8000
./manage.py runserver 0.0.0.0:8000
- ctrl + c

cd ~/django_project
gunicorn --bind 0.0.0.0:8000 django_project.wsgi:application
- ctrl + c

deactivate
sudo nano /etc/systemd/system/gunicorn.service

- paste inside gunicorn.service:

[Unit]
Description=gunicorn daemon
After=network.target

[Service]
User=ubuntu
Group=www-data
WorkingDirectory=/home/ubuntu/django_project
ExecStart=/home/ubuntu/django_project/env/bin/gunicorn --workers 3 --bind unix:/home/ubuntu/django_project/django_project.sock django_project.wsgi:application

[Install]
WantedBy=multi-user.target


sudo systemctl start gunicorn
sudo systemctl enable gunicorn
sudo nano /etc/nginx/sites-available/django_project
- copy inside:
server {
    listen 80;
    server_name YOUR_AMAZON_LIGHTSAIL_IP;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/ubuntu/django_project;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/home/ubuntu/django_project/django_project.sock;
    }
}

- save the file

sudo ln -s /etc/nginx/sites-available/django_project /etc/nginx/sites-enabled
sudo nginx -t
sudo systemctl restart nginx
sudo ufw delete allow 8000
sudo ufw allow 'Nginx Full'

I can't run sudo systemctl restart nginx, the lightsail instance seems to take over port 80 and it immediately restarts the process if I kill it.

I follow the setups and I am getting the following error
502 Bad Gateway
nginx/1.10.3 (Ubuntu)

@waqas80 when writing gunicorn.service under [Service] you need to properly bind the gunicorn executable file to Unix socket within the project

I think there's a django_project.sock file missing?