Load balancing SockJS server backends - sticky and least connections simultaniously

[Александр Емелин]

Greetings everyone!

Please - look at this issue https://github.com/FZambia/centrifuge/issues/47

There are several SockJS server backends and Nginx as load balancer. To route each client request to the same backend sticky sessions used.

So upstream looks something like this:

upstream app {
    sticky;
    server 1;
}

Clients connect to server 1 and then there is a moment when another server backend must be added:

upstream app {
    sticky;
    server 1;
    server 2;
}

But new clients round-robin to both servers - so the load on server 1 continues to grow.

What we want here is least connections algorithm when sticky cookie is not set - so our both servers get approximately equal load. As far as I know this is not possible with Nginx.

So several questions here. Am I right? Or maybe I missing something and load balancer can be configured in another way which solves problem with unequal load. I saw examples of Haproxy config file (https://github.com/sockjs/sockjs-node/blob/master/examples/haproxy.cfg) which does load balancing by sockjs URL - how it behaves in situation described above?

[Bryce Kahle]

This is a question for nginx or haproxy and is not specific to SockJS.

—
Bryce

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[Александр Емелин]

Yep, I realize that this is not a direct SockJS question - I was just looking for help with SockJS real-world usage from people already deployed large SockJS applications.