In this tutorial we’ll install the Debian Linux 9 (squeeze), Apache 2 with mpm-itk (to run each web as a isolated user),...
Monitoring Varnish with Muninadmin
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
2. cd into the munin plugins directory
3. Download the munin-varnish plugin
git clone git://github.com/basiszwo/munin-varnish.git
4. Set correct permissions
chmod a+x /usr/share/munin/plugins/munin-varnish/varnish_*
5. Link the plugin sections to the munin config
ln -s /usr/share/munin/plugins/munin-varnish/varnish_* /etc/munin/plugins/
6. Add these lines to the bottom of the munin-node config (pico /etc/munin/plugin-conf.d/munin-node)
7. Restart munin-node