Nagios Support Forum

Hello. I'm looking for some input on mod-gearman and NagiosXI, regarding the CPU/RAM specs for each. I have looked over the forum this morning and found some very helpful advice to start me in the direction, specifically this thread:

https://support.nagios.com/forum/viewto ... 16&t=33681

My environment wants to setup NagiosXI and Mod-Gearman to allow scaling to about 18,000 service checks among about 3600 different VMs and physical hosts, so approx. 5 checks per each system. Previous co-workers have suggested we use the following deployment:

NagiosXI server: 16 CPU cores / 8GB RAM
Mod-gearman 01: 8 CPU cores / 4GB RAM
Mod-gearman 02: 8 CPU cores / 4GB RAM

Gearmand will be running on the main NagiosXI host. Should this cover the expected growth, and if so, do you have any suggestions on the worker configuration?


Much thanks for any help or suggestions you can offer!

- Jake

It's really hard to say until things are in the wild. Generally speaking, checks are run more often when a service is down so if your systems are typically stable that helps out. Another issue could be bandwidth between the workers and xi.

Are you offloading your DB? Do you use a ramdisk?

Are these physical machines or VMs? If VMs how many VMs are running on the VM server? What sort of disk access will you have whether VM or not?

Those questions aside, looks reasonable to me.

Thank you for the reply. Unfortunately, a fair amount of this isn't known to me, outside of the Nagios and Mod_Gearman systems being VMs. While I know there are numerous factors to consider, I'm glad that it looks like the main Nagios and the two Mod_gearman's CPU/RAM stats look like a good start. I'm mainly trying to give the other team a good foundation to start with regarding the CPU/RAM and if possible, mod_gearman configs. With this many checks and hosts, would you suggest any adjustments to the work configurations or a place for me to look?

Without more info, it's going to be hard to say much. Certainly https://assets.nagios.com/downloads/nag ... ios-XI.pdf could be of use. I'd also take a look at https://assets.nagios.com/downloads/gen ... utions.pdf if I were you.

Things can certainly get a bit iffy around the 25k host+service mark, but we know people have tuned their settings/servers for higher than that. It just depends.