Re: [LARTC] tc+mrtg

["Kristiadi Himawan" <kristiadi_himawan@dtp.net.id>]

I already use external script that fetch iptables mangle table from
PREROUTING and POSTROUTING counter.
But the traffic isn't really accurate, i found when there's bulk UDP traffic
come to the shaper, my mrtg shown that
the traffic shown bigger than allocated bandwidth for that class. So the
question, it's possible to make script from tc command,
that count bandwith acctually passing through the shaper.



Regards,

Kris
----- Original Message ----- 
From: "Rene Gallati" <lartc@draxinusom.ch>
To: <gideon@adept.co.za>
Cc: <lartc@mailman.ds9a.nl>
Sent: Monday, July 19, 2004 8:47 PM
Subject: Re: [LARTC] tc+mrtg


Gideon le Grange wrote:

> On Mon, 2004-07-19 at 14:20, Roy wrote:
>
>>MRTG can only show interface load, basicaly it is the graphic
representation
>> of what you will see with ifconfig.
>>
>>For more advanced graph you need to use another software than mrtg.
>
>
> MRTG can graph any variable that you can read using SNMP. The problem is
> getting the tc stats readable using SNMP, that's the trick bit (which as
> far as I've seen can't be done, but I hope I'm wrong).
>

MRTG doesn't necessarily need SNMP, you can feed it ANY value via a perl
script. I've been doing it for ages. You just need to get at the values
(peridoic tc -s qdisc show, parse it, feed mrtg)

 From : http://people.ee.ethz.ch/~oetiker/webtools/mrtg/mrtg-reference.html

"External Monitoring Scripts
     If you want to monitor something which does not provide data via
snmp you can use some external program to do the data gathering.

     The external command must return 4 lines of output:

Line 1
     current state of the first variable, normally 'incoming bytes count'

Line 2
     current state of the second variable, normally 'outgoing bytes count'

Line 3
     string (in any human readable format), telling the uptime of the
target.

Line 4
     string, telling the name of the target.

Depending on the type of data your script returns you might want to use
the 'gauge' or 'absolute' arguments for the Options keyword.

Example:

  Target[ezwf]: `/usr/local/bin/df2mrtg /dev/dsk/c0t2d0s0`

Note the use of the backticks (`), not apostrophes (') around the command.

If you want to use a backtick in the command name this can be done but
you must escape it with a backslash ...

If your script does not have any data to return but does not want mrtg
to complain about invalid data, it can return 'UNKNOWN' instead of a
number. Note though that only rrdtool is realy equipped to handle
unknown data well.
"


-- 

C U

      - -- ---- ----- -----/\/  René Gallati  \/\---- ----- --- -- -
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