1) Install django-tracking (thankyou for that tip Van Gale Google Maps + GeoIP is amazing!)
2) Add this middleware:
from django.contrib.sessions.models import Session from tracking.models import Visitor from datetime import datetime class UserRestrictMiddleware(object): """ Prevents more than one user logging in at once from two different IPs """ def process_request(self, request): ip_address = request.META.get('REMOTE_ADDR','') try: last_login = request.user.last_login except: last_login = 0 if unicode(last_login)==unicode(datetime.now())[:19]: previous_visitors = Visitor.objects.filter(user=request.user).exclude(ip_address=ip_address) for visitor in previous_visitors: Session.objects.filter(session_key=visitor.session_key).delete() visitor.user = None visitor.save()3) Make sure it goes after the VisitorTrackingMiddleware and you should find previous logins are automatically bumped when someone new logs in :)
转自： http://stackoverflow.com/questions/821870/how-can-i-detect-multiple-logins-into-a-django-web-application-from-different-lo