Tag Archives: Nagios

I know what “I” did last summer!

Having a little time off from the day to day responsibilities I usually have at my work place, last summer I decided to build the map of Italy with all the offices, for our Help Desk.

So, with the magic of Wikipedia (http://en.wikipedia.org/wiki/Italy), Gimp and Mk-livestatus I have done in NagVis, a dashboard that displays live checks of the network and server software. This map is displayed on a TV in the Help Desk room, so that everyone can see the network status. Continue reading

Nagios exchange plans to introduce paid plug-ins?

Yesterday after I have added my first plug-in to http://exchange.nagios.org I saw a potentially worrying new field: “License:”

This could mean two things: either they want to help the user when he searches for a free plug-in or they want to establish a market for the developers and the Nagios users.

What will come only the future will see!

Here are the screenshots:

and…

Nagios check_snmp INVERTER

This is my first plug-in made for Nagios. It was made in order to help the administrator to check via SNMP the inverse scale variables such as UPS line in voltage.

For example, one needs to know when the input voltage of an UPS drops to zero => an error, as the power line is in fault, but not having problems when the same check is 220V in normal conditions.

With the normal “check_snmp” you can’t check those limits, as the check will always be in error.

Usage:  ./check_snmp_inverter.sh -H <remote_host_IP> -C <comunity_string> -o <OID> -w <warning value> -c <critical value> -u <measure block> -l <label>

The critical value is the real value that one needs to set, for example: 0, and the warning value greater than the critical – ex: 240.

You can download it from here.

Nagios WMI Proxy

This is a sketch article in which I want to do a brief description of how to install a Windows WMI proxy and do the checks via WMI in your windows network.

The WMI Proxy is basically a Windows Server / Workstation that has NRPE_NT or NSClient++ (you need to change a bit the configurations) installed and from which with an administrative user can do checks to the windows network via the WMI.

WMI is also used as a check for some other products including but not limited to: SCCM, SCOM, Spiceworks, etc.

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Creating a WMI proxy for Nagios – arguments Pro and Contra

In this article I wish to mark some advantages / disadvantages of having a WMI proxy in your Nagios setup.

To WMI or not to WMI….

First we need to explain what exactly a WMI proxy is. Basically this machine is a Linux/Windows machine with a Nagios client installed that runs as a service. This WMI proxy has some scripts (I will detail them in my next post) capable to check other Windows servers with the help of the WMI repository located on each Windows server. The same technique is applied with success by SCCM, SCOM, SpiceWorks, etc.

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Check the Cisco CallManager and CallManager Express (=> 6):

You will need first to check the SNMP OID’s with your systems (see the UPS tutorial ) and enable on CCM hosts the SNMP string and checks. All the checks that I have done for this tutorial are from the file CISCO-CCM-MIB.my

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