Load balancers are used to spread a load among a number of servers. Hardware load balancers are still somewhat expensive, whereas software balancers can achieve most of the benefits of a hardware solution.
HAProxy is the software load balancer of choice for most people: fast, powerful, and highly configurable.
In this recipe, I'll show you how to build an HAProxy server to load-balance web requests across web servers. We'll use exported resources to build the haproxy configuration file just like we did for the NFS example.
Create the file
modules/haproxy/manifests/master.ppwith the following contents:class haproxy::master ($app = 'myapp') { # The HAProxy master server # will collect haproxy::slave resources and add to its balancer package { 'haproxy': ensure => installed } service { 'haproxy': ensure => running, enable => true, require => Package['haproxy'], } include haproxy::config ...