Nginx load balancing policy

Question

Is the Nginx's load balancing policy customizable in any way? Having two sites A and B I want 20% of all the requests to go to A and the rest to B. Is that possible/feasible? Is there a better solution out there for this task?

Thanks,

Alex

Answer 1

In your upstream block you can adjust the weights like this:

upstream upstream_server {
            server 192.168.1.11:80 weight=2;
            server 192.168.1.12:80 weight=8;
}

For every 10 requests, it will send 2 to 1.11, and 8 to 1.12, about an 20%/80% divide.

There are a bunch of options like to set an idle spare, and load balancing by source IP address. See the docs for more details about the upstream parameter.