rrdtool display min max avg in legend

Question

Pardon me but I'm still new to rrd graphing. I've come across lot of graphs where the MIN, MAX and AVG values are displayed alongside the legend labels. How do I create such graphs?

Answer 1

With the print / gprint options in your graph definition.

I think a good way to learn how this stuff is generated is to have a look at Cacti's graph templates where you can see how the graphs are combined from single elements.

Edit: To illustrate that a bit better, just a random graph from a Cacti installation together with the command Cacti used to generate it. As you see, it will use the consolidation functions (AVERAGE, MAX, MIN) to calculate these values out of the measured data (a and b).

/usr/bin/rrdtool graph - \
--imgformat=PNG \
--start=-86400 \
--end=-300 \
--title='General Switch 3rd floor #1 - Traffic - Fa0/11' \
--rigid \
--base=1000 \
--height=90 \
--width=400 \
--alt-autoscale-max \
--lower-limit=0 \
--vertical-label='bytes per second' \
--slope-mode \
--font TITLE:12: \
--font AXIS:8: \
--font LEGEND:10: \
--font UNIT:8: \
DEF:a="/var/lib/cacti/rra/general_switch_3rd_floor_1_traffic_in_226.rrd":traffic_in:AVERAGE \
DEF:b="/var/lib/cacti/rra/general_switch_3rd_floor_1_traffic_in_226.rrd":traffic_out:AVERAGE \
AREA:a#00CF00FF:"Inbound"  \
GPRINT:a:LAST:" Current\:%8.2lf %s"  \
GPRINT:a:AVERAGE:"Average\:%8.2lf %s"  \
GPRINT:a:MAX:"Maximum\:%8.2lf %s\n"  \
LINE1:b#002A97FF:"Outbound"  \
GPRINT:b:LAST:"Current\:%8.2lf %s"  \
GPRINT:b:AVERAGE:"Average\:%8.2lf %s"  \
GPRINT:b:MAX:"Maximum\:%8.2lf %s\n"