[mrtg] Monitoring CPU Utilization on a CentOS Machine

[Matt Baer]

Hello. 

I'm having some issues getting the CPU utilization for any machine. For testing purposes, I'll only include one machine here. It is a single core CPU running CentOS. The machine that MRTG is running on is Ubuntu 9.04 Desktop and it's using MRTGv2.16.2. Here the relevant portion of my mrtg.cfg file: 

LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt 
Target[mailserv.cpu]:ssCpuRawUser.0&ssCpuRawUser.0:public at 10.0.0.10 + ssCpuRawSystem.0&ssCpuRawSystem.0:public at 10.0.0.10 + ssCpuRawNice.0&ssCpuRawNice.0:pub$ 
MaxBytes[mailserv.cpu]: 100 
Title[mailserv.cpu]: CPU LOAD 
PageTop[mailserv.cpu]: <H1>Active CPU Load %</H1> 
Unscaled[mailserv.cpu]: ymwd 
ShortLegend[mailserv.cpu]: % 
YLegend[mailserv.cpu]: CPU Utilization 
Legend1[mailserv.cpu]: Active CPU in % (Load) 
Legend2[mailserv.cpu]: 
Legend3[mailserv.cpu]: 
Legend4[mailserv.cpu]: 
LegendI[mailserv.cpu]: Active 
LegendO[mailserv.cpu]: 
Options[mailserv.cpu]: growright,nopercent,gauge 

I have tried many many many different changes to this but they all warrant the same results. I get a graph, but nothing populates within the graph. I notice that I'm getting things in the /var/mail/root. Here is my latest excerpt from that: 

Unknown SNMP var ssCpuRawUser.0 
at /usr/bin/mrtg line 2207 
Unknown SNMP var ssCpuRawUser.0 
at /usr/bin/mrtg line 2207 
2009-09-24 00:35:01: WARNING: Expected a number but got '11:49:28' 
2009-09-24 00:35:01: WARNING: Expected a number but got 'nas2' 
Unknown SNMP var ssCpuRawSystem.0 
at /usr/bin/mrtg line 2207 
Unknown SNMP var ssCpuRawSystem.0 
at /usr/bin/mrtg line 2207 
2009-09-24 00:35:01: WARNING: Expected a number but got '11:49:28' 
2009-09-24 00:35:01: WARNING: Expected a number but got 'nas2' 
Unknown SNMP var ssCpuRawNice.0 
at /usr/bin/mrtg line 2207 
Unknown SNMP var ssCpuRawNice.0 
at /usr/bin/mrtg line 2207 
2009-09-24 00:35:01: WARNING: Expected a number but got '11:49:28' 
2009-09-24 00:35:01: WARNING: Expected a number but got 'nas2' 
Unknown SNMP var ssCpuRawUser.0 
at /usr/bin/mrtg line 2207 
Unknown SNMP var ssCpuRawUser.0 
at /usr/bin/mrtg line 2207 
2009-09-24 00:35:01: WARNING: Expected a number but got '34 days, 7:01:39' 
2009-09-24 00:35:01: WARNING: Expected a number but got 'mail.server.com' 
Unknown SNMP var ssCpuRawSystem.0 
at /usr/bin/mrtg line 2207 
Unknown SNMP var ssCpuRawSystem.0 
at /usr/bin/mrtg line 2207 
2009-09-24 00:35:01: WARNING: Expected a number but got '34 days, 7:01:39' 
2009-09-24 00:35:01: WARNING: Expected a number but got 'mail.server.com' 
Unknown SNMP var ssCpuRawNice.0 
at /usr/bin/mrtg line 2207 
Unknown SNMP var ssCpuRawNice.0 
at /usr/bin/mrtg line 2207 
2009-09-24 00:35:01: WARNING: Expected a number but got '34 days, 7:01:39' 
2009-09-24 00:35:13: ERROR: Target[localhost.cpu][_IN_] ' $target->[18]{$mode} + $target->[19]{$mode} + $target->[20]{$mode} ' (warn): Use of uninitialized value in addition (+) at (eval 54) line 1. 
2009-09-24 00:35:13: ERROR: Target[localhost.cpu][_OUT_] ' $target->[18]{$mode} + $target->[19]{$mode} + $target->[20]{$mode} ' (warn): Use of uninitialized value in addition (+) at (eval 55) line 1. 
2009-09-24 00:35:13: ERROR: Target[mailserv.cpu][_IN_] ' $target->[22]{$mode} + $target->[23]{$mode} + $target->[24]{$mode} ' (warn): Use of uninitialized value in addition (+) at (eval 58) line 1. 
2009-09-24 00:35:13: ERROR: Target[mailserv.cpu][_OUT_] ' $target->[22]{$mode} + $target->[23]{$mode} + $target->[24]{$mode} ' (warn): Use of uninitialized value in addition (+) at (eval 59) line 1. 

As I'm sure you've noticed, it's almost as iff ssCpuRawUser.0 returns 'uptime'. I cannot find an answer that works anywhere. Does anyone have a fix for this? 
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