Django: Avoid clash of port 8000 (runserver)

Question

I develop on serveral projects at once.

If I run the runserver twice, I get this error:

System check identified no issues (0 silenced).
September 10, 2021 - 10:44:26
Django version 3.1.4, using settings 'mysite.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Error: That port is already in use.

I know that I can supply a different port manually, but a more automatic approach would be nice.

How could I solve this clash without manually giving each project a port by hand?

I have more than 50 systems on my laptop, and I don't want to give them each a port number by hand.

Answer 1

You can implement something like following.

1. Add RUN_SERVER_PORT in settings.py

RUN_SERVER_PORT = 8080

2. Implement following code in manage.py

#!/usr/bin/env python
"""Django's command-line utility for administrative tasks."""
import os
import sys
from django.core.management.commands.runserver import Command as runserver
from django.conf import settings


def main():
    """Run administrative tasks."""
    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'accountant.settings')
    try:
        from django.core.management import execute_from_command_line
    except ImportError as exc:
        raise ImportError(
            "Couldn't import Django. Are you sure it's installed and "
            "available on your PYTHONPATH environment variable? Did you "
            "forget to activate a virtual environment?"
        ) from exc
    runserver.default_port = settings.RUN_SERVER_PORT
    execute_from_command_line(sys.argv)


if __name__ == '__main__':
    main()

Proof of Work:

python manage.py runserver

Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
September 19, 2021 - 12:47:59
Django version 3.2.6, using settings 'accountant.settings'
Starting development server at http://127.0.0.1:8080/
Quit the server with CONTROL-C.

You can use any available port in RUN_SERVER_PORT