In this recipe, you'll learn how to select graphics for hosts to appear in various parts of the Nagios Core web interface. This is done by adding directives to a host to specify the paths to appropriate images to represent it.
Adding these definitions has no effect on Nagios Core's monitoring behavior; they are mostly cosmetic changes, although it's useful to see at a glance whether a particular node is a server or a workstation, particularly on the network map.
You will need to run Nagios Core 4.0 or a newer server and have access to its web interface. You must also be able to edit the configuration files for the server.
It's a good idea to verify that you actually have the required images installed. The default set of icons is included in
/usr/local/nagios/share/images/logos. Don't confuse this with the directory above it,
images, which contains images used as part of the Nagios Core web interface itself.
logos directory, you should find a number...