[rrd-users] Monitoring System Load (graphing it)

[David Jenkins]

Hi,
 
I've been using MRTG for a while and now have decided to have a play
around with rrdtool.
 
I have currently set it up (correctly I believe) to monitor the volume
of network interface traffic on my server and am now trying to work out
how to monitor the load on the server.
 
I have searched the web and found many graphs displaying this data but
have yet to come across the commands used to create the .rrd file and
make/update the graph.
 
I have checked the mailing list here as well and found a useful thread
but it wasn't quite what I was looking for.
I have also read "man rrdtutorial" a couple of times but I do obviously
not understand something fundamental.
 
I would be most grateful if someone could give me some help/pointers as
to where I'm going wrong.
 
I have enclosed the script and commands I am using and have used in
creating the .rrd file:
 
########################################################################
##
 
/usr/local/bin/rrdtool create /home/dj/public_html/rrdtool/loadavg.rrd \
   DS:1min:COUNTER:600:U:U   \
   RRA:AVERAGE:0.5:1:600      \
   RRA:AVERAGE:0.5:6:700      \
   RRA:AVERAGE:0.5:24:775     \
   RRA:AVERAGE:0.5:288:797    \
   RRA:MAX:0.5:1:600          \
   RRA:MAX:0.5:6:700          \
   RRA:MAX:0.5:24:775         \
   RRA:MAX:0.5:288:797
 
########################################################################
##
 
 
 
And here is my script which runs via a cron job every 5 minutes:
 
 
 
########################################################################
##
#!/usr/bin/perl
$ip_address = "127.0.0.1";
 
$min1 = `/usr/local/bin/snmpget -Ov $ip_address public laLoad.1`;
#$min5 = `/usr/local/bin/snmpget -Ov $ip_address public laLoad.2`;
#$min15 = `/usr/local/bin/snmpget -Ov $ip_address public laLoad.3`;
chomp ($min1) ;
#chomp ($min5) ;
#chomp ($min15) ;
 
$update = `/usr/local/bin/rrdtool update
/home/dj/public_html/rrdtool/loadavg.rr
d N:$min1`;
 
$graph = `/usr/local/bin/rrdtool graph
/home/dj/public_html/rrdtool/loadavg_day.png --start -86400 \\
 
DEF:linea=/home/dj/public_html/rrdtool/loadavg.rrd:1min:AVERAGE
LINE3:linea#FF0000:"1 min"`;
########################################################################
##
 
 
 
I did initially trying monitoring the 3 different load values but as
this didn't work I've 
resorted to getting it to work with just the 1 minute average for now.
 
Kindest regards,
 
David

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