Last updated on November 16th, 2015 at 09:56 am

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What is mod_proxy_balancer?

mod_proxy_balancer is an Apache module available since Apache 2.1. It allows turning an Apache installation into a load balancer retrieving requested pages from two or more backend web servers and delivering them to the user’s computer.
One important feature of mod_proxy_balancer is that it can keep track of sessions which means that a single user always deals with the same backend webserver (sticky sessions).

Requirements and installation

The module requires:
an Apache HTTP Server installation version 2.1 or later (at the time of writing, 2.2.15 is the latest version available);
mod_proxy extension.
In order to install Apache and the required extensions, download the sources from the Apache HTTP Server website, untar the archive and run the following commands from the main directory:
./configure –enable-proxy –enable-proxy-balancer [run ./configure -h to list all the available options]
make install

Main URL is
and we have 2 nodes [MEMBERS] namely and

ProxyPass /example balancer://mywebcluster
An instance of cluster is created (mycluster) with two members.
The /example URL of the load balancer (i.e. is mapped to the two members.
Requests to the load balancer will be alternatively forwarded to the workers or members.
Three load balance methods are currently available:
byrequests: weighted request count balancing;
bytraffic: weighted traffic byte count balancing;
bybusyness: pending request balancing.

More coming soon….

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