Monitoring Tools

Phil Regnauld regnauld at nsrc.org
Thu Aug 19 15:23:44 CDT 2010


Nathan Eisenberg (nathan) writes:
> It hasn't really changed. Almost every monitoring package I've found
> where you want to monitor something like 'disk space free on /' requires
> a daemon of some sort on the host - whether that's SNMPD or their agent.

	Anything else than SNMP is a hassle (IMHO).

	I understand the idea of having a dedicated agent for some hosts -
	Windows for instance, when querying the WMI - and often it's the only
	way for a vendor to have a predictable, verified  element in the greater
	scheme (the network).

	But in most cases, monitoring can be achieved by extending the SNMP mib,
	and using and custom scripts that will report on mail queue size, in-house
	application status, etc...

> FWIW, I have had their agent running on many, many servers over the
> years - it has never caused me a moment of heartache (for safety's sake,
> iptables restricts who can talk to the agent, which has its own control
> mechanism built in to define who it will talk to, and it runs as a
> restricted user, just in case).

	<hat employer=other>
	While developing our own monitoring product, we've had to deal with
	various constraints from the customer side, for instance pharmaceutical
	companies where there was no way installing an agent on PLC machines would
	pass internal audit, without having the entire system re-validated (we're
	talking FDA-validated medication production here).
	</hat>

	But often, SNMPD ships with or is available as an optional base
	component (Windows, most UNIXes) and it's easier to convince the IT
	suits.  Go figure.

	Oh, and it avoided us having to install an agent on 1000+ servers :)

	Cheers,
	Phil




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