Nagios Support Forum

We use Nagios XI to monitor about 2000 host and 30000 services of the SMNP.
The hardware specifications is CPU 16 Core, Ram 32G. But the Nagios XI always often crash.
Do you have any suggestions or information for the restriction number of monitoring services according to hardware specifications.
On the other hand, we very like use the function "Bulk Host Cloning and Import" of the Configuration Wizards.
However, when we clone more than 300 machines, we often get the fail status.
Can you get our any suggestions? or we can use the command line to do the cloning function(In fact, we have tried it, but the config will always restore by XI).
Thank very much.

bennspectrum wrote:We use Nagios XI to monitor about 2000 host and 30000 services of the SMNP.
The hardware specifications is CPU 16 Core, Ram 32G. But the Nagios XI always often crash.
Do you have any suggestions or information for the restriction number of monitoring services according to hardware specifications.

Nagios XI performs poorly past 20,000 services.

You need to look at implementing multiple Nagios XI servers.

You can try doing things like implement a RAM Disk, offload checks using Mod-Gearman, but these are band-aid solutions. Once you get past 20,000 checks there is so much going on that you can't do much to resolve this.

bennspectrum wrote:On the other hand, we very like use the function "Bulk Host Cloning and Import" of the Configuration Wizards.
However, when we clone more than 300 machines, we often get the fail status.
Can you get our any suggestions? or we can use the command line to do the cloning function(In fact, we have tried it, but the config will always restore by XI).

You are hitting PHP limits. This KB article explains how to increase the limits.

https://support.nagios.com/kb/article.php?id=34

Check the log /var/log/httpd/error_log for errors which will direct you as to which options need increasing.

Thanks Box293,
If we want to monitor 20000 host and 260000 services, can you give us some advice of the amount of Nagios XI and the hardware specifications?
Very Thanks

You want to aim at not exceeding 20,000 services per Nagios XI server. How much RAM and CPU all depends on the type of plugins being used.

There's no easy formula.

Do you plan on growing? If you had 13 x Nagios XI servers @ 20,000 services each, then you would need to provision a 14th XI server to be able top keep growing.

I wouldn't try and put 20,000 services per XI server, I would aim at around 15,000 max, as that allows for some growth.

Also, 20,000 services per XI service is a rough estimate. Customers usually have about 5 services on average per host, so thats approximately 4,000 hosts. 4,000 host checks + 20,000 services means technically you have about 24,000 services.

If you only had 2 services per host, thats about 10,000 hosts. Combine that with the 20,000 services and you're peaking at 30,000 services.

bennspectrum wrote:If we want to monitor 20000 host and 260000 service

Thats about 13 services per host. Basically you are looking at 1000 hosts per Nagios XI server, meaning you need about 20 Nagios XI servers.

Hardware requirements are roughly estimated here:
https://support.nagios.com/kb/article.php?id=13

This of course completely depends on the type of plugins and how much CPU and memory they run.