You only need to do 2 things:
1. Run those Django projects on different ports
2. Set different session cookie names for them. Example:
- Project1: settings.py:
SESSION_COOKIE_NAME = 'project1'
- Project2: settings.py:
SESSION_COOKIE_NAME = 'project2'
In addition, if your Django servers are under a nginx reverse proxy:
According to Django security notes (https://www.djangoproject.com/weblog/2012/dec/10/security/), Hostnames must consist of characters [A-Za-z0-9] plus hyphen ('-') or dot ('.'), we have to use '-' (hyphen) instead of '_' (underscore) when naming the upstream server: 'my-first-project', 'my-second-project'