[mrtg] Configuring MRTG/rrdtool with <1 minute intervals

[Jonathan Williams]

Thanks for the swift replies. I shall try setting a decimal value in the morning. I will need to check my version of MRTG as well - that may be a factor, since I did a blind install from a redhat/centos repository assuming (probably incorrectly) that it would be fairly recent.

I was intending on using rrdcgi for my web interface, it appears to provide all the functionality i need in that regard. The other CGI's on the MRTG website are also on my radar. I have until Monday to knock something together so I may play with several configurations to see which is best.

Cheers!

J.Williams

-----Original Message-----
From: Tobias Oetiker [mailto:tobi at oetiker.ch]
Sent: Tue 5/27/2008 18:26
To: Jonathan Williams
Cc: mrtg at lists.oetiker.ch
Subject: Re: [mrtg] Configuring MRTG/rrdtool with <1 minute intervals
 
Hi Jonathan,

if you use rrdtool for logging, you can set the interval to decimal
values ... eg

0.5 or so


tobi
Yesterday Jonathan Williams wrote:

> Hello,
>
> I am currently attempting to configure MRTG/rrdtool to poll some SNMP
> statistics at a rate under 1 minute. I have followed the instructions
> for modifying the configuration file as I understood them, but when I
> test the configuration or try to launch MRTG I get an error.
>
> I have checked the mailing list archive (albeit non-exhaustively) and
> couldn't find anything related.
>
> Here is the relevent info:
>
> [root at snark mrtg-test]# LANG=C mrtg --check test.cfg
> Argument "0:10" isn't numeric in int
> at /usr/bin/../lib/mrtg2/MRTG_lib.pm line 100, <CFG> line 13.
> ERROR: CFG Error in "interval", line 13: 0:10 should be at least 1
> Minute and no more than 60 Minutes
>
> [root at snark mrtg-test]# cat test.cfg
> # Created by
> # Jonathan Williams
>
> ### Global Config Options
>
> PathAdd: /usr/bin
> LogFormat: rrdtool
> RunAsDaemon: Yes
> Interval: 0:10
>
> #  for UNIX
> # WorkDir: /home/http/mrtg
> WorkDir: /tmp/mrtg-test
>
> #  or for NT
> # WorkDir: c:\mrtgdata
>
> ### Global Defaults
>
> #  to get bits instead of bytes and graphs growing to the right
> # Options[_]: growright, bits
>
> EnableIPv6: no
>
> (...snip: Target information follows..)
>
> If I remove the "Interval: 0:10" line or set it to a value between 1 and
> 60 (with no seconds resolution) the configuration loads fine. What am I
> doing wrong? The configuration test script appears to be finding rrdtool
> and RRDs.pm correctly - but is not allowing me to set intervals under 1
> minute.
>
> Thanks in advance!
>
> J.Williams
>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902