[mrtg] configure DNS SERVER on mrtg

[Niall O'Reilly]

On 12 Oct 2011, at 09:11, Divya wrote:

> I am using Redhat Linux and  chcek how much query are coming on Primary DNS server though MRTG

	Fine.

	You'll need:

     1.	some tool to probe your name server and present the counts
	of interest in the format required by MRTG,

     2.	nameserver configuration to allow this tool to do its job,

     3.	MRTG configuration to activate the tool periodically.

	I use BIND, and have a script which uses the rndc interface to
	cause named to write to its statistics file, then parses the 
	most recent block of statistics to extract counts of interest
	and present them as MRTG requires.  There may be equivalent
	or better scripts bundled as unsupported third-party
	contributions with either BIND or MRTG.  I didn't check, as
	I was interested in the learning experience at the time.
	I can send it on, but only on request, and on the understanding
	that neither I nor my employer offers any warranty or support
	whatsoever.

	If you're also using BIND, I think you'll find that the BIND 
	reference manual (ARM) has all the information needed for 
	configuring named and rndc to work together.  You may find
	the bind-users list helpful.

	Here is the relevant fragment of our MRTG configuration:

Target[scarr-named-stats]: `/usr/local/mrtg/scripts/mrtg-named-stats`
Options[scarr-named-stats]: growright,nopercent
Directory[scarr-named-stats]: servers/scarr
MaxBytes[scarr-named-stats]: 10000
Title[scarr-named-stats]: Server scarr: named query rate
PageTop[scarr-named-stats]: <H1>Named query rate on server <cite> scarr </cite> </H1>
Legend1[scarr-named-stats]: Total query rate (queries/s)
Legend2[scarr-named-stats]: Recursive query rate (queries/s)
Legend3[scarr-named-stats]: Maximal 5 minute query rate
Legend4[scarr-named-stats]: Maximal 5 minute recursion rate
LegendI[scarr-named-stats]: Total queries
LegendO[scarr-named-stats]: Recursive queries
YLegend[scarr-named-stats]: Queries/s
ShortLegend[scarr-named-stats]: queries/s
WithPeak[scarr-named-stats]: ymw

	For the time being (although we may have to block access at some stage)
	you may be able to see the result here:

http://scarr.ucd.ie/mrtg/bf/servers/scarr/scarr-named-stats.html

	I hope this helps.

	Niall O'Reilly