Load balancing between multiple servers in nginx but with specific IP requirements

manpreet Best Answer 2 years ago

I am trying to load balance between multiple backend servers which should be something relatively simple using upstream. That said, I have some specific IP requirements that I'm not sure how to handle. Essentially:

1. I need to group requests from the same IP onto the same backend, up to a maximum of 5 distinct simultaneous connections per backend. This needs that after 5 simultaneous requests to 1 backend I need to go to a different one.
2. Each backend must not serve more than 3 different IPs at once. This means that even if there are less than 5 requests at once to one backend, if they are from 3 different IPs I need to move on to a different one while observing rule #1.

Is this possible at all or are upstream server weights all I can do?

Thanks!