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upstream-fair: The fair load balancer module for NGINX


You can install this module in any RHEL-based distribution, including, but not limited to:

  • RedHat Enterprise Linux 7, 8, 9
  • CentOS 7, 8, 9
  • AlmaLinux 8, 9
  • Rocky Linux 8, 9
  • Amazon Linux 2 and Amazon Linux 2023
yum -y install
yum -y install nginx-module-upstream-fair

Enable the module by adding the following at the top of /etc/nginx/nginx.conf:

load_module modules/;

This document describes nginx-module-upstream-fair v0.1.3 released on Oct 03 2017.

Nginx Upstream Fair Proxy Load Balancer

**( compatible with nginx 1.11.6+ & with dynamic module capability ) **


The Nginx fair proxy balancer enhances the standard round-robin load balancer provided with Nginx so that it will track busy back end servers (e.g. Thin, Ebb, Mongrel) and balance the load to non-busy server processes.

Further information can be found on

Ezra Zygmuntowicz has a good writeup of the fair proxy load balancer and how to use it here:


You'll need to re-compile Nginx from source to include this module. Modify your compile of Nginx by adding the following directive (modified to suit your path of course):

./configure --with-http_ssl_module --add-module=/absolute/path/to/nginx-upstream-fair make make install


Change your Nginx config file's upstream block to include the 'fair' directive:

upstream mongrel { fair; server; server; server; }

If you encounter any issues, please report them using the bugtracker at


Git source repositories:;a=summary

Please feel free to fork the project at GitHub and submit pull requests or patches.


You may find additional configuration tips and documentation for this module in the GitHub repository for nginx-module-upstream-fair.