Django: Avoid clash of port 8000 (runserver) - django

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.
Add RUN_SERVER_PORT in settings.py
RUN_SERVER_PORT = 8080
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

Answer 2

You can create your own manage command runsever_foo.
Then you can fetch the default value for the port from settings.py or from os.environ.

Answer 3

Reference to this post: https://stackoverflow.com/a/38319452/16936785
I would recommend to amend the server port under manage.py into the following for a random port selection:
import random
from django.core.management.commands.runserver import Command
port_number = random.randint(8000, 8888)
Command.default_port = str(port_number)

Answer 4

put this in your .bashrc .zshrc or .bash_profile depends on your environment.
#!/usr/bin/env bash
function runserver()
{
local PORTNUM=8000
for (( ; ; )); do
nc -z 127.0.0.1 $PORTNUM
[ $? -ne 0 ] && break
PORTNUM=$(( $RANDOM % 1000 + 8000 ))
done
python manage.py runserver $PORTNUM $#
}
Then just run runserver and it should bring up a test server with a port in the range of [8000, 9000)
This function uses netcat to test if the port is available, you might need to install netcat.

Answer 5

To run Django on different port
python manage.py runserver <your IP>:<port> :
python manage.py runserver 0.0.0.0:5000
Or
python manage.py runserver <port> : python manage.py runserver 5000
For automation
Create a bash script like django_5000 and django_7000 where you execute differents command according to your desired port.