Nagios Support Forum

Running Nagios XI 5.6.9. When selecting Hostgroup Summary is just sits there with a spinning wheel and returns nothing. Hostgroup Overview returns listing of each group with the servers listed in that group. I have attached our /usr/local/nagios/etc/hostgroup.cfg file in which reviewing it, looks like it is missing the names of the servers in each group. I compared this to the servicegroup.cfg which list all the servers in each group.
Is there a way to rebuild this file to contain the correct information.

Have you given those servers a name? You can enter a name by navigating to the Configure section of Nagios using the bar on top > click Core Config Manager under Advanced Configuration > click Hosts under Monitoring > click on a nameless host and enter something for Host Name.

You may also want to consider updating to the latest version of Nagios XI, and then applying the configuration again.

We have 39 defined host groups. The groups and hosts show when I use the Hostgroup Overview and Hostgroup grid.
Attached is a list of the defined Host groups from Configuration Manager.
We have schedule applying the latest update on Tuesday this week.

You may be encountering a PHP limitation on your system. Please refer to the following linked knowledge base article on how to edit the php.ini file to accommodate more activity on your server.
https://support.nagios.com/kb/article/n ... e-611.html

The hostgroups.cfg file should be regenerated by applying configuration in the core configuration manager in XI. If you navigate to the Configure section of Nagios using the bar on top > click Core Config Manager under Advanced Configuration > then click Apply Configuration under Quick Tools > you will see the button to Apply Configuration.

Perform the modification to the php.ini for the max_input_var and the other steps listed and now the host summary is work correctly.
Additionally I also change the default memory setting from 128M to 256M.
Are there any other changes or modification that should be checked and/or modified for a large environment?

Great! I'm glad that worked for you.

That is probably the most common limitation that comes up as systems grow. Otherwise, you will probably want to make sure to allocate the minimum requirements as laid out in the following linked document.
https://support.nagios.com/kb/article.php?id=12