RRDtool example code

graph.sh

#!/bin/bash

let time=1407882500
let now=$(( time+300 ))

rm datafile.rrd

rrdtool create datafile.rrd --start $time --step 60 \
        DS:hdduse:GAUGE:100:0:100 \
        RRA:AVERAGE:0.5:1:1440 \
        RRA:AVERAGE:0.5:60:720 \
        RRA:MAX:0.5:1:1440 \
        RRA:MAX:0.5:60:720 \
        RRA:MIN:0.5:1:1440 \
        RRA:MIN:0.5:60:720

rrdtool update datafile.rrd $(( $time+60  )):10
rrdtool update datafile.rrd $(( $time+120 )):30
rrdtool update datafile.rrd $(( $time+180 )):35
rrdtool update datafile.rrd $(( $time+240 )):50
rrdtool update datafile.rrd $(( $time+300 )):55

rrdtool graph graph.png \
        --start $time --end $(( $time+900 )) \
        --lower-limit 0 --upper-limit 100  --rigid \
        DEF:pkt=datafile.rrd:hdduse:AVERAGE \
        VDEF:slope=pkt,LSLSLOPE \
        VDEF:cons=pkt,LSLINT \
        CDEF:lsl2=pkt,POP,slope,COUNT,*,cons,+ \
        CDEF:pred=lsl2,80,100,LIMIT \
        VDEF:minpred=pred,FIRST \
        VDEF:maxpred=pred,LAST \
        LINE1:lsl2#991111:"Least Sqr Pred.\n":dashes=8 \
        LINE2:pkt#0044aa:"Percentage"\
        LINE3:80 \
        AREA:10#FF000022::STACK \
        AREA:10#FF000044::STACK \
        GPRINT:minpred:"reaching 80 on \: %c\n":strftime \
        GPRINT:maxpred:"reaching 100 on \: %c\n":strftime


rrdtool graph /dev/null -f '' \
        --start $time --end $(( $time+900 )) \
        --lower-limit 0 --upper-limit 100  --rigid \
        DEF:pkt=datafile.rrd:hdduse:AVERAGE \
        VDEF:slope=pkt,LSLSLOPE \
        VDEF:cons=pkt,LSLINT \
        CDEF:lsl2=pkt,POP,slope,COUNT,*,cons,+ \
        CDEF:pred=lsl2,80,100,LIMIT \
        VDEF:minpred=pred,FIRST \
        VDEF:maxpred=pred,LAST \
        PRINT:minpred:"reaching 80 on \: %c":strftime \
        PRINT:maxpred:"reaching 100 on \: %c":strftime