Monitoring Varnish with Munin
Varnish is a great reverse proxy and very useful for load balancing. Here you can find a tutorial on installing Varnish: Installing and configuring Varnish HTTP accelerator.
Munin is a network/system monitoring application that presents output in graphs through a web interface. If you haven't installed it already, use this tutorial: Monitoring multiple servers with Munin.
Assuming you have both varnish and munin installed, here's a tutorial on installing a plugin for munin to monitor Varnish.
1. Install git-core to receive the plugin from github
apt-get install git-core
Installing and configuring Varnish HTTP accelerator
Varnish is a state of the art web accelerator. Its mission is to sit in front of a web server an cache the content. It makes your web site go fast.
1. Install Varnish
apt-get install varnish