Nagios Support Forum

I have a nagiosxi environment where multiple admins make changes and we also have an automated deployment system setup where machines get added/deleted automatically using the API in Nagiosxi. I'm trying to find a easy way to make a graph showing the number of current/active HOSTS (and also SERVICE CHECKS) being monitored so I can have a way graph the historical trend. I have not found any quick out of the box type of way but maybe some sort of mysql query with the plugin "check_mysql_query" that is talked about in this article https://support.nagios.com/kb/article.php?id=513 showing how to check and monitor both max_connections and threads_connected. Maybe someone has figured out the mysql query to output the of hosts the database know about. Any help is appreciated.

Thanks

Hello, @da1701d.

**Disclaimer. The example that I'm giving below may be not 100% accurate and serves just as a concept on how to create a plugin that is going to do what you want. You will need to adjust the code to get your plugin to work. Also, you could contact Nagios support for a custom plugin development.


1. You can make custom JSON query to Nagios which will return the info on a number of hosts/services.
Take a look at this manual:
https://labs.nagios.com/2014/06/19/expl ... -7-part-1/

Paste this link in your web browser:
http://<nagios server>/nagios/jsonquery.html

2. Create a PHP script in libexec folder

//example of a json url from step 1
$url = "http://192.168.4.172/nagios/cgi-bin/sta ... le+pending";
$json=file_get_contents($url);
$data=json_decode($json,true);
$hosts = $data['count'];

2. Now you can output this data into a graph.
Take a look at this documentation:
https://nagios-plugins.org/doc/guidelines.html

Add this line:
echo "OK|'Number of hosts'=$hosts"

Basically everything after | sign in a format String = Value will be automatically rendered to the graph in XI.

3. Create a new check command in XI: 4. Create a new service check for localhost that is going to use the command from step 3.

Regards.

Thanks! I was not familiar with this feature of nagios. I think it can be the solution. I notice the initial http query requires a username and password. What did you do from a script perspective for getting around the username and password?

Thanks

@da1701d, Not a problem. Basic authentication is used in this case, so you can add username and password to your query in this format: