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
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Installing and using the IPMI tool

The Intelligent Platform Management Interface (IPMI) is a standardized computer system interface used by system administrators to manage a computer system and monitor its operation.

The development of this interface specification was led by Intel Corporation and is supported by more than two hundred computer systems vendors including Dell, Hewlett-Packard, Intel, and NEC Corporation.

1. Install the ipmitool which is used to send commands and receive information from the management interface.

apt-get install ipmitool
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Install and configure MailWatch monitoring tool for MailScanner

MailWatch for MailScanner is a web-based front-end to MailScanner written in PHP, MySQL and JpGraph. It comes with a CustomConfig module for MailScanner which causes MailScanner to log all message data (excluding body text) to a MySQL database which is then queried by MailWatch for reporting and statistics.

1. Install Apache2, MySql server and PHP5 with required modules. You may already have some or all of these packages installed.

apt-get install apache2 php5-cli php5 mysql-server libdbd-mysql-perl php5-gd php5-mysql libapache2-mod-php5
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Installing Cacti – RRDTool-based Graphing Solution

cacti_logoCacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG.

1. Install Cacti and all required packages

apt-get install cacti
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Installing Nagios Core monitoring system (client and server)

nagios-logoNagios Core allows you to monitor your entire IT infrastructure to ensure systems, applications, services, and business processes are functioning properly. In the event of a failure, it can alert technical staff of the problem, allowing them to begin remediation processes before outages affect business processes, end-users, or customers.

The monitoring server

1. Install Nagios Core and dependancies

apt-get install nagios3 nagios-nrpe-plugin
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Installing ntop network monitoring tool

ntop is a network traffic probe that shows the network usage, similar to what the popular top Unix command does. ntop is based on libpcap and it has been written in a portable way in order to virtually run on every Unix platform and on Win32 as well.

ntop users can use a a web browser (e.g. netscape) to navigate through ntop (that acts as a web server) traffic information and get a dump of the network status. In the latter case, ntop can be seen as a simple RMON-like agent with an embedded web interface.

1. Install required packages

apt-get install ntop
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Installing the Hobbit monitor on lenny

Hobbit monitors your hosts, your network services, and anything else you configure it to do via extensions. Hobbit can periodically generate requests to network services – http, ftp, smtp and so on – and record if the service is responding as expected. You can also monitor local disk utilisation, logfiles and processes through the use of agents installed on the servers.

Before you install, make sure you have Apache web server installed.

1. Install hobbit packages

apt-get install hobbit hobbit-client hobbit-plugins
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