Server planning for Nagios install

[Jake]

On Sun, Jan 25, 2009 at 2:00 PM, Eric Michaelis <combinare at gmail.com>wrote:
>
> I realize that each installation will be different based on the number
> of hosts/services that will be monitored, but I'm looking for something
> basic--something along the lines of "a base system with 512MB of RAM and
> 10G disk space is a good starting point for monitoring X hosts running Y
> services, with a total of X*Y = Z services. Then, assume you need
> another N GB of ram for every M services you add."


If we assume that many nagios installations montitor modest size
environments (less than 100 hosts and 500 services) then any modern
single-processor server with 1GB of memory and 10GB of disk should do just
fine in most cases.

Beyond those numbers my philosophy has been that hardware is cheap so
over-spec and if you still run into problems it isn't too hard to scale up
anyway. Our current server is dual quad-core xeons (8 cores total) at 2.5GHz
with 4GB of memory. On this server I monitor about 850 hosts and 2150
services that are 100% active checks executed server-side (snmp-based checks
instead of nrpe). We also collect perf data and hand it over to Nagiosgraph.
In addition, we run Cacti for about 200 devices, a few light-weight
network-related web apps, etc. and the server sits at about 10% CPU on
average and the load average peaks at 2.28. Nagios generates about 1.5MB or
less of logs per day and other things like rrd and scratch files for service
checks are a constant size so disk space isn't really a concern at all.

-- 
Jake Paulus
JakePaulus at gmail.com
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