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+=======
+rrdtool
+=======
+
+-------------------
+Module: mod_rrdtool
+-------------------
+
+:Author: Jan Kneschke
+:Date: $Date: 2004/08/29 09:43:49 $
+:Revision: $Revision: 1.1 $
+
+:abstract:
+  mod_rrdtool is used to monitor the traffic and load on the webserver
+
+.. meta::
+  :keywords: lighttpd, skeleton
+
+.. contents:: Table of Contents
+
+Description
+===========
+
+RRD_ is a system to store and display time-series data (i.e. network
+bandwidth, machine-room temperature, server load average).
+
+.. _RRD: http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/
+
+Options
+=======
+
+rrdtool.binary
+  path to the rrdtool binary
+
+  e.g.: ::
+
+    rrdtool.binary = "/usr/bin/rrdtool"
+
+rrdtool.db-name
+  filename of the rrd-database. Make sure that <rrdtool.db-name> doesn't exist
+  before the first run, as lighttpd has to create the DB for you.
+
+  e.g.: ::
+
+    rrdtool.db-name = "/var/www/lighttpd.rrd"
+
+Generating Graphs
+=================
+
+::
+
+  #!/bin/sh
+
+  RRDTOOL=/usr/bin/rrdtool
+  OUTDIR=/var/www/servers/www.example.org/pages/rrd/
+  INFILE=/var/www/lighttpd.rrd
+  OUTPRE=lighttpd-traffic
+
+  DISP="-v bytes --title TrafficWebserver \
+          DEF:binraw=$INFILE:InOctets:AVERAGE \
+          DEF:binmaxraw=$INFILE:InOctets:MAX \
+          DEF:binminraw=$INFILE:InOctets:MIN \
+          DEF:bout=$INFILE:OutOctets:AVERAGE \
+          DEF:boutmax=$INFILE:OutOctets:MAX \
+          DEF:boutmin=$INFILE:OutOctets:MIN \
+          CDEF:bin=binraw,-1,* \
+          CDEF:binmax=binmaxraw,-1,* \
+          CDEF:binmin=binminraw,-1,* \
+          CDEF:binminmax=binmaxraw,binminraw,- \
+          CDEF:boutminmax=boutmax,boutmin,- \
+          AREA:binmin#ffffff: \
+          STACK:binmax#f00000: \
+          LINE1:binmin#a0a0a0: \
+          LINE1:binmax#a0a0a0: \
+          LINE2:bin#a0a735:incoming \
+          GPRINT:bin:MIN:%.2lf \
+          GPRINT:bin:AVERAGE:%.2lf \
+          GPRINT:bin:MAX:%.2lf \
+          AREA:boutmin#ffffff: \
+          STACK:boutminmax#00f000: \
+          LINE1:boutmin#a0a0a0: \
+          LINE1:boutmax#a0a0a0: \
+          LINE2:bout#a0a735:outgoing \
+          GPRINT:bout:MIN:%.2lf \
+          GPRINT:bout:AVERAGE:%.2lf \
+          GPRINT:bout:MAX:%.2lf \
+          "
+
+
+  $RRDTOOL graph $OUTDIR/$OUTPRE-hour.png -a PNG --start -14400 $DISP
+  $RRDTOOL graph $OUTDIR/$OUTPRE-day.png -a PNG --start -86400 $DISP
+  $RRDTOOL graph $OUTDIR/$OUTPRE-month.png -a PNG --start -2592000 $DISP
+
+  OUTPRE=lighttpd-requests
+
+  DISP="-v req --title RequestsperSecond -u 1 \
+          DEF:req=$INFILE:Requests:AVERAGE \
+          DEF:reqmax=$INFILE:Requests:MAX \
+          DEF:reqmin=$INFILE:Requests:MIN \
+          CDEF:reqminmax=reqmax,reqmin,- \
+          AREA:reqmin#ffffff: \
+          STACK:reqminmax#0e0e0e: \
+          LINE1:reqmin#a0a0a0: \
+          LINE1:reqmax#a0a0a0: \
+          LINE2:req#00a735:requests"
+
+
+  $RRDTOOL graph $OUTDIR/$OUTPRE-hour.png -a PNG --start -14400 $DISP
+  $RRDTOOL graph $OUTDIR/$OUTPRE-day.png -a PNG --start -86400 $DISP
+  $RRDTOOL graph $OUTDIR/$OUTPRE-month.png -a PNG --start -2592000 $DISP
+