Distributed SNMP monitoring.

[Frater, Greg J]

Just a thought...Can rrd write to a database like mysql, I thought it could.
If so what would it take to code Nagios or a wrapper of some sort like the
urlize check to write the check performance data to a database backend then
use apan and or rrd to create the graphs for viewing the data.  This may be
a off the wall idea, it sounded good this morning.

-----Original Message-----
From: Stanley Hopcroft [mailto:Stanley.Hopcroft at IPAustralia.Gov.AU]
Sent: Sunday, December 08, 2002 5:09 PM
To: nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Distributed SNMP monitoring.


Dear Sir,

FWIW, there seems to be no serious competitor to RRD for saving time 
series data.


On Sun, Dec 08, 2002 at 04:46:06AM -0500, Furnish, Trever G wrote:
> Well, actually, if by "fully integrated" you mean "as integrated as anyone
> could ever want", then no, it's not fully integrated. :-)  No offense - it
> looks like a very nice contribution - but I for one would greatly prefer
not
> to have to spawn off rrdtool to open and close its files again every time
> nagios wants to save data.  It'd be nice if whatever performance archiving
> mechanism gets focused on is one where the long-running nagios process
> communicates directly with a long-running, all files held open rrdtool
> process or a database.
> 
> It looks like (ok, have I given away the fact yet that I haven't actually
> set up apan yet? ;-) ) APAN works by getting called every time you call a
> command you want to record performance info for, then returning the result
> to Nagios and kicking off an rrdtool process to archive it.  Although the
> apan and rrdtool executables will probably be in OS read cache, that's
still
> a lot of additional overhead.
> 
> Comments intended constructively, corrections appreciated...
>

I am not sure if I follow you, but it is not necessary to 'spawn off 
rrdtool' since rrdtool has a public API and shared libraries (in at 
least C and Perl) that implement the API.

The RRD fetch, update, create functions can be called directly from
Nagios in the same way that it can call any other function that is
properly linked (such as the Perl functions if Nagios is built with
embedded Perl support) with it.

I don't see this as 'a lot of additional overhead', especially with 
Dynamic loading.

Projects that use this approach include the new RRD plugin for Ntop 
(Again FWIW, Ntop has replaced DB interfaces to mySQL and friends by 
RRD).

RRD tool buys an extraordinary amount of power in

. its data manipulation functions

. it offers (development at this stage) Holt-Winters time series
prediction (from Jake Brutlag of Microsoft). This is an RRA that
predicts the next values of data like interface octets that vary
periodically, based on historical values of data and variance.

It is good way to automatically detect if traffic levels have altered
significantly, far more sophisticated than simply setting thresholds.

> -t.
>

Yours sincerely. 

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.


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