Nagios Support Forum

Hi,

We have unlimited license and so far we have added approximately 6000 hosts and 5000 services in Nagios XI for monitoring but unfortunately, it is not possible to add more hosts. Nagios XI does not give any error but when we add a host through CCM and then apply the changes, the XI section does not sync with the core and "Last Check" does not update in the XI section for all hosts and services. Additionally, with every change made to Nagios, it takes long time, about 15 minutes for XI and core to synchronize.
I should also say that we used to be on Centos 7 but we migrated to ubuntu and since then the slowdowns have increased.

OS: Ubuntu 20.04
Nagios XI version: 5.7.5
RAM: 48 GB
CPU: 24 GHz

Thank you so much!

With that many hosts, I imagine you'll need to have more than one nagios server. Also, I wonder how you can have 5000 services, unless you have multiple checks of a type, such as CPU or memory usage.
You may want to locate the nagios docs that talk about host/service limitations.

Thank you for your response. Yes, we have defined different types of checks for each service. Do we have to pay the unlimited license fee again for the second Nagios XI? And if we launch the second Nagios XI, will the two Nagios XIs be clustered together?

I still don't see how anyone can have 5k services for 6k hosts.
Licensing questions should be directed to nagios.
As far as I know there is no nagios clustering.

You’re likely hitting performance, not license, limits, XI scales better with distributed setups.