Nagios core – Open Source IT monitoring system

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When I was looking for a monitoring system I was looking for something free since the organization I’m working for didn’t want to invest in something like that. After searching for a while, Nagios core seemed like the natural choice.

 So What is Nagios Core? Nagios core is an Open Source monitoring system for IT people. It enables you to monitor, identify and resolve IT infrastructure problem before they become critical. Here is the official explanation:

Nagios Core is the industry standard, Open Source IT monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

Nagios 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.

In other words it allows you to focus on administration and less on putting out fires. you can create server groups to have a logical layout of you system Infrastructure.

My Experience with Nagios Core: I monitor all of our servers (Domain controllers, Terminal servers, SQL server, VoIP server, Camera server, websites and more) with Nagios Core.

I started simple, by checking just the ping to see if everything is alive. then, using the check_wmi_plus plugin, I started to add other checks like CPU and RAM utilisation, disk space, page files, event log, operation system details, up time and more.


After that I added Nagiosgraph plugin which allows you to log data from Nagios and display it in a graph.


Basically you need a Linux system to install it on. In the beginning I Installed it on an Ubuntu 12.04 VirtualBox machine. It’s relatively easy to install and get it up and running (there are a lot of step by step tutorials on how to do it).  After it was working and I was comfortable with the system, I did a clean install on an new Ubuntu 12.04 Server (on a VMware machine).

So, why should you use Nagios Core?

  • It allows you to monitor your servers, systems, services, applications and more.
  • Receive real-time notification of problems in your systems by email and even SMS.
  • There are a lot of plugins that makes Nagios more powerful.
  • It’s Open Source.
  • It’s FREE 🙂

You can check out the nagios online demo and login as an admin to see how it works. I hope you’ll give it a try since it’s an awesome system that can help you in your daily work.


Yaniv Norman

Help Desk Technician

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  1. Martin Lehner June 20, 2014 at 11:18 pm

    Very interesting software there Yaniv. I’ve never heard of it, but I sure will give it a try, great post!

  2. Yaniv Norman June 22, 2014 at 6:03 am

    I’m happy you liked it 🙂
    If you (or any one else) needs help with it, I’ll be happy to help.

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