[mrtg] RunAsDaemon vs. cron job

Brogden, Ian Ian.Brogden at COORS.COM
Wed Feb 20 00:07:38 CET 2008

You need to ensure each of the cfg files can be processed in under 5
minutes, even if some devices are down (this actually makes the queries
take much longer, due to timeouts and retries).

I usually split my files to contain under 200 interfaces each, and just
run multiple instances using runasdaemon, but it depends if you
frequently have multiple devices down.

Right now, I have about a dozen running, totalling somewhere around 1000
counters, on a 7 year old Dell Wintel server.

Ian Brogden
EDS - CTO @ MolsonCoors Account
( Mobile Phone:+1-303-961-1850
+ mailto:ian.brogden at eds.com

-----Original Message-----
From: mrtg-bounces at lists.oetiker.ch
[mailto:mrtg-bounces at lists.oetiker.ch] On Behalf Of Michael Silver
Sent: Tuesday, February 19, 2008 3:56 PM
To: mrtg at lists.oetiker.ch
Subject: [mrtg] RunAsDaemon vs. cron job


Another newbie question...

I want to use MRTG to track traffic patterns on 51 devices, most having
6 interfaces I want to monitor. That brings us up to ~612 queries (51
devices x 6 interfaces x 2 counters) assuming worst case scenarios. The
machine running MRTG runs two other services - Nagios and Request
Tracker. The 15 min. load averages running those services plus
monitoring 3 of the above devices runs around 0.02 with 1 min. spikes as
high as 0.50.

Given those loads, I don't think the server is going to have issues with
the added snmp traffic. Still, I would like to set up MRTG to be
reasonable in terms of its resources. As I see it, I could divide my
devices into 5 groups, each with their own cfg file, so I can stagger
the mrtg load across 5 minutes using cron, or I could run one big cfg
file using RunAsDaemon. (I guess I could run one big file and cron, but
I don't see the point in that.) 

Does anyone have any recommendations or experiences with this before I
shoot myself in the foot by not seeing the obvious? I gotta admit, I'm
leaning towards 5 groups and cron right now.

Thanks for any pointers or advice.


Michael Silver, Network Administrator
Parkland Regional Library
5404 56 Avenue Lacombe, AB T4L 1G1 
Phone: 403.782.3850    Fax: 403.782.4650
http://www.prl.ab.ca/  msilver at prl.ab.ca

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