Need help with an rrdtool graph.

[KuJoe]

I'm trying to build a script to graph the load of a server using rrdtools but for some reason my graph will only show the data for 12 hours even though the graph itself is 24 hours. Any ideas what I'm doing wrong? I've never used rrdtools before so this script was pieced together from other scripts I've found. I used the same scripts to build a bandwidth graph which works properly, it's just this one that doesn't show the data for 24 hours.


#!/bin/sh

RRDFILE="/var/lib/rrd/load.rrd"
/usr/bin/rrdtool create ${RRDFILE} --start N -s 30 DS:load1:GAUGE:600:0:100 RRA:AVERAGE:0.5:2:800
date=$(date +'%s')
value=$(uptime | awk '{print substr($(NF-2), 0, length($(NF-2))-1)}')
/usr/bin/rrdtool update ${RRDFILE} N:$value

/usr/bin/rrdtool graph /var/www/html/load.png \
-N \
-E \
--start now-24hours \
-t "Average Load (24h)" --height=199 --width=500 \
--lower-limit 0 \
--vertical-label "Load Average" \
-a PNG \
DEF:load1=${RRDFILE}:load1:AVERAGE \
'VDEF:load1last=load1,LAST' \
'LINE1:load1#0000ff:Load Average' \
'GPRINT:load1:LAST:Current Load\:%3.2lf'

Here's the results: http://n3rd.info/upl/load_graph_24h.png

 

[perennate]

And /var/lib/rrd/load.rrd has the full data?

Have you tried rerunning the create with more rows?

/usr/bin/rrdtool create ${RRDFILE} --start N -s 30 DS:load1:GAUGE:600:0:100 RRA:AVERAGE:0.5:2:1600

 

[VPSCorey]

It's the create command that's all.  Just look at the documentation, but one option in there should be for how long to keep the data and I'm guessing it's set to 12 hours.

 

[KuJoe]

Thanks both of you. This fixed it:

/usr/bin/rrdtool create ${RRDFILE} --start N -s 30 DS:load1:GAUGE:600:0:100 RRA:AVERAGE:0.5:2:1600

 

[perennate]

http://oss.oetiker.ch/rrdtool/doc/rrdtool.en.html has nice documentation (I'd never heard of rrdtool before and still have never used it but documentation apparently said how to fix the issue )

 

[KuJoe]

http://oss.oetiker.ch/rrdtool/doc/rrdtool.en.html has nice documentation (I'd never heard of rrdtool before and still have never used it but documentation apparently said how to fix the issue )

Thanks. I've been using that site which has been extremely helpful. The create command I used was from another website which was used for generating a 24 hour graph for CPU usage so I assumed it would work for Load also, I guess I was wrong.