CentOS - Dec 2010 - Graphing System Load MRTG

I check system load like so:

[root at server cron.daily]# w
 10:07:33 up 4 days, 15:01,  2 users,  load average: 4.22, 3.17, 3.09

I would like to to graph the 3.17 5 minute average with MRTG.  Anyone
know of some examples of doing this?

On 12/21/2010 10:09 AM, Matt wrote:
> I check system load like so:
>
> [root at server cron.daily]# w
>   10:07:33 up 4 days, 15:01,  2 users,  load average: 4.22, 3.17, 3.09
>
> I would like to to graph the 3.17 5 minute average with MRTG.  Anyone
> know of some examples of doing this?
Where you should start depends on how much else you would like to 
monitor.  Cacti is probably the easiest thing to set up for a small 
number of machines and not unreasonable for a single host monitoring 
itself.  I like OpenNMS but it is overkill for a small setup.

-- 
   Les Mikesell
    lesmikesell at gmail.com

Matt writes:
> I check system load like so:
> 
> [root at server cron.daily]# w
>  10:07:33 up 4 days, 15:01,  2 users,  load average: 4.22, 3.17, 3.09
> 
> I would like to to graph the 3.17 5 minute average with MRTG.  Anyone
> know of some examples of doing this?
$ uptime
 16:40:45 up 7 days, 54 min, 20 users,  load average: 0.17, 0.17, 0.12
$ snmpget -c community -v2c localhost UCD-SNMP-MIB::laLoadInt.1
UCD-SNMP-MIB::laLoadInt.1 = INTEGER: 14
$ snmpget -c community -v2c localhost UCD-SNMP-MIB::laLoadInt.2
UCD-SNMP-MIB::laLoadInt.2 = INTEGER: 17
$ snmpget -c community -v2c localhost UCD-SNMP-MIB::laLoadInt.3
UCD-SNMP-MIB::laLoadInt.3 = INTEGER: 11
$ 



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> I check system load like so:
>
> [root at server cron.daily]# w
> ?10:07:33 up 4 days, 15:01, ?2 users, ?load average: 4.22, 3.17, 3.09
>
> I would like to to graph the 3.17 5 minute average with MRTG. ?Anyone
> know of some examples of doing this?
Wrote this simple perl script:

#!/usr/bin/perl -w

my $uptime = `uptime`;
my $load = ( split /load/, $uptime )[1];
$load = ( split /,/, $load )[1];
chomp $load;
print "$load\n";

It spits out 5 minute load average.  Would like to just have MRTG
graph the result every 5 minutes.

On 12/21/2010 11:09 AM, Matt wrote:
> I check system load like so:
> 
> [root at server cron.daily]# w
>  10:07:33 up 4 days, 15:01,  2 users,  load average: 4.22, 3.17, 3.09
> 
> I would like to to graph the 3.17 5 minute average with MRTG.  Anyone
> know of some examples of doing this?
The easy way or the hard way?

The easy way:

You take the snmpget command someone else previously provided, convert
it to the oid, add it to the appropriate place in your mrtg.cfg (If I
recall correctly).

The hard way:

use one of the shell scripts provided, cat /proc/loadavg, or your perl
script to grab the values, figure out how to stuff them into rrdtool,
then figure out how to convince mrtg to render the resulting rrd files.

Really, the best way is to install cacti, and be done with it, as others
have suggested.

-- 
-- John E. Jasen (jjasen at realityfailure.org)
-- "Deserve Victory." -- Terry Goodkind, Naked Empire

Make yourself a script, include this:

   #!/bin/sh

   # first the load 5 and 15 min avg
   # multiply * 100 to avoid floats
   # it helps if mrtg "period" is a multiple of 5 mins
   uptime | sed -e 's/^.*average.*: \(.*\)$/\1/' -e 's/ //g' |
   awk -F, '{ printf("%.0f\n",$2*100);
printf("%.0f\n",$3*100) }'
   # the uptime
   uptime | sed 's/.*\sup\s\(.*\),\s*.*user.*$/\1/'
   # my name
   uname -n

than for mrtg (in the mrtg.cfg file):

   Target[load]:           `THE_NAME_AND_PATH_OF_THE_SCRIPT_ABOVE`
   Options[load]:          integer,gauge
   Title[load]:            System load
   Xsize[load]:            600
   Ysize[load]:            200
   Ytics[load]:            10
   MaxBytes[load]:         3000
   PageTop[load]:          <H1>Load Average</H1>
   YLegend[load]:          Load Average
   ShortLegend[load]:      &nbsp;
   LegendO[load]:          5 minute average
   LegendI[load]:          15 minute stagger



jobst





On Tue, Dec 21, 2010 at 10:09:30AM -0600, Matt (lm7812 at gmail.com)
wrote:
> I check system load like so:
> 
> [root at server cron.daily]# w
>  10:07:33 up 4 days, 15:01,  2 users,  load average: 4.22, 3.17, 3.09
> 
> I would like to to graph the 3.17 5 minute average with MRTG.  Anyone
> know of some examples of doing this?
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> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
-- 
Sometimes, the sharpest sword is not enough, but usually...it is.

  | |0| |   Jobst Schmalenbach, jobst at barrett.com.au, General Manager
  | | |0|   Barrett Consulting Group P/L & The Meditation Room P/L
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