[edit] ngx_http_upstream_fair_module

This module is not distributed with the Nginx source. Installation instructions are below.

The upstream_fair module sends an incoming request to the least-busy backend server, rather than distributing requests round-robin.

Example:

upstream backend {
  server server1;
  server server2;
  fair;
}

[edit] fair

syntax fair

context upstream

Enables fairness.

[edit] upstream_fair_shm_size

syntax upstream_fair_shm_size size

default upstream_fair_shm_size 32k

context main

Size of the shared memory for storing information about the busy-ness of backends. Defaults to 8 pages (so 32k on most systems).

[edit] Installation

This module is not distributed with the Nginx source. You can browse its git repository , or download the tar ball .

After extracting, add the following option to your Nginx ./configure command:

  --add-module=path/to/upstream_fair/directory

Then "make" and "make install" as usual.