[mrtg] Need help on CPU info collection

Li Wei Nan l.weinan at gmail.com
Tue Sep 2 13:13:54 CEST 2008

Hi Everyone,

	I'm trying to collect our server's CPU usage information with the  
help of MRTG. However, I met some problems on doing it and cannot find  
the reason.

	I have two servers. Let's call it S1, S2.

	S2 is running MRTG to collect the CPU info from S1.

	In S2, I execute this command: snmpwalk -v 1 -c public S1 UCD-SNMP- 
	And it can give me the result correctly: UCD-SNMP-MIB::ssCpuRawUser.0  
= Counter32: 90081

	Similar to above, the ssCpuRawNice and ssCpuRawSystem are also works  

	In my mrtg config file in S2, I have such config:

0:public at + ssCpuRawSystem.0&ssCpuRawSystem.0:public at 
  + ssCpuRawNice.0&ssCpuRawNice.0:public at
	Title[cluster1.cpu]: Server CPU Load
	PageTop[cluster1.cpu]: <H1>CPU Load For Cluster1- System, User and  
Nice Processes</H1>
	MaxBytes[cluster1.cpu]: 100
	ShortLegend[cluster1.cpu]: %
	YLegend[cluster1.cpu]: CPU Utilization
	Legend1[cluster1.cpu]: Current CPU percentage load
	LegendI[cluster1.cpu]: Used
	Options[cluster1.cpu]: growright,nopercent
	Unscaled[cluster1.cpu]: ymwd

	And I've imported MIB as instructed:

	LoadMIBs: /usr/share/snmp/mibs/UCD-SNMP-MIB.txt

	But the CPU info is not collected by MRTG at all. What confuses me is  
that Memory Info Collection is working correctly. And same to CPU  
info, Memory Info also use MIB: UCD-SNMP-MIB.txt. And checking from  
snmpwalk, both CPU and Memory info can be collected by S1 correctly.  
But why does the CPU info collection work with MRTG? Can any one gives  
me some info?


- Li Wei Nan

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