36.11. Example

rrdtool create memory.rrd \
        --start 1023654125 \
        --step 300 \
        DS:mem:GAUGE:600:0:671744 \
        RRA:AVERAGE:0.5:12:24 \
        RRA:AVERAGE:0.5:288:31
			

			
for (( ; ; )) do
	memory=$(snmpwalk -c public -v2c 172.16.1.10 hrSWRunPerfMem | awk 'BEGIN {total_mem=0} { if ($NF == "KBytes") {total_mem=total_mem+$(NF-1)}}  END {print total_mem}')
	rrdtool update memory.rrd N:${memory}
	sleep 300
done &
			
			

rrdtool graph memory.png \
	--title="Memory Usage" \
	--vertical-label="Memory Consumption (MB)" \
	--start=0 \
	--end=start+1day \
	--color=BACK#CCCCCC \
	--color=CANVAS#CCFFFF \
	--color=SHADEB#9999CC \
	--height=125 \
	--upper-limit=656 \
	--lower-limit=0 \
	--rigid \
	--base=1024 \
	DEF:tot_mem=memory.rrd:mem:AVERAGE \
	CDEF:tot_mem_cor=tot_mem,0,671744,LIMIT,UN,0,tot_mem,IF,1024,/ \
	CDEF:machine_mem=tot_mem,656,+,tot_mem,- \
	HRULE:656#000000:"Maximum Available Memory - 656 MB" \
	AREA:machine_mem#CCFFFF:"Memory Unused" \
	AREA:tot_mem_cor#6699CC:"Total memory consumed in MB"
			

rrdtool create test.rrd             \
            --start 920804400          \
            DS:speed:COUNTER:600:U:U   \
            RRA:AVERAGE:0.5:1:24       \
            RRA:AVERAGE:0.5:6:10

rrdtool update test.rrd 920804700:12345 920805000:12357 920805300:12363
rrdtool update test.rrd 920805600:12363 920805900:12363 920806200:12373
rrdtool update test.rrd 920806500:12383 920806800:12393 920807100:12399
rrdtool update test.rrd 920807400:12405 920807700:12411 920808000:12415
rrdtool update test.rrd 920808300:12420 920808600:12422 920808900:12423

rrdtool fetch test.rrd AVERAGE --start 920804400 --end 920809200

rrdtool graph speed.png                                 \
         --start 920804400 --end 920808000               \
         DEF:myspeed=test.rrd:speed:AVERAGE              \
         LINE2:myspeed#FF0000

rrdtool graph speed2.png                           \
      --start 920804400 --end 920808000               \
      --vertical-label m/s                            \
      DEF:myspeed=test.rrd:speed:AVERAGE              \
      CDEF:realspeed=myspeed,1000,\*                  \
      LINE2:realspeed#FF0000

rrdtool graph speed3.png                             \
      --start 920804400 --end 920808000               \
      --vertical-label km/h                           \
      DEF:myspeed=test.rrd:speed:AVERAGE              \
      "CDEF:kmh=myspeed,3600,*"                       \
      CDEF:fast=kmh,100,GT,kmh,0,IF                   \
      CDEF:good=kmh,100,GT,0,kmh,IF                   \
      HRULE:100#0000FF:"Maximum allowed"              \
      AREA:good#00FF00:"Good speed"                   \
      AREA:fast#FF0000:"Too fast"

rrdtool graph speed4.png                           \
      --start 920804400 --end 920808000               \
      --vertical-label km/h                           \
      DEF:myspeed=test.rrd:speed:AVERAGE              \
      CDEF:nonans=myspeed,UN,0,myspeed,IF             \
      CDEF:kmh=nonans,3600,*                          \
      CDEF:fast=kmh,100,GT,100,0,IF                   \
      CDEF:over=kmh,100,GT,kmh,100,-,0,IF             \
      CDEF:good=kmh,100,GT,0,kmh,IF                   \
      HRULE:100#0000FF:"Maximum allowed"              \
      AREA:good#00FF00:"Good speed"                   \
      AREA:fast#550000:"Too fast"                     \
      STACK:over#FF0000:"Over speed"




   rrdtool create all.rrd --start 978300900 \
            DS:a:COUNTER:600:U:U \
            DS:b:GAUGE:600:U:U \
            DS:c:DERIVE:600:U:U \
            DS:d:ABSOLUTE:600:U:U \
            RRA:AVERAGE:0.5:1:10
   rrdtool update all.rrd \
            978301200:300:1:600:300    \
            978301500:600:3:1200:600   \
            978301800:900:5:1800:900   \
            978302100:1200:3:2400:1200 \
            978302400:1500:1:2400:1500 \
            978302700:1800:2:1800:1800 \
            978303000:2100:4:0:2100    \
            978303300:2400:6:600:2400  \
            978303600:2700:4:600:2700  \
            978303900:3000:2:1200:3000
   rrdtool graph all1.png -s 978300600 -e 978304200 -h 400 \
            DEF:linea=all.rrd:a:AVERAGE LINE3:linea#FF0000:"Line A" \
            DEF:lineb=all.rrd:b:AVERAGE LINE3:lineb#00FF00:"Line B" \
            DEF:linec=all.rrd:c:AVERAGE LINE3:linec#0000FF:"Line C" \
            DEF:lined=all.rrd:d:AVERAGE LINE3:lined#000000:"Line D"
			

rrdtool create seconds1.rrd   \
  --start 920804700          \
  DS:seconds:COUNTER:600:U:U \
  RRA:AVERAGE:0.5:1:24

rrdtool update seconds1.rrd \
  920805000:000 920805300:300 920805600:600 920805900:900
rrdtool update seconds1.rrd \
  920806000:000 920806300:300 920806603:603 920806900:900

rrdtool graph seconds1.png                       \
  --start 920804700 --end 920806200             \
  --height 200                                  \
  --upper-limit 1.05 --lower-limit 0.95 --rigid \
  DEF:seconds=seconds1.rrd:seconds:AVERAGE      \
  CDEF:unknown=seconds,UN                       \
  LINE2:seconds#0000FF                          \
  AREA:unknown#FF0000