Monitoring Disk and CPU Utilization

[Robert Suh]

Nicholas, for Unix like OSes (Linux), take a look at ucd-snmp (UCDavis)
or net-snmp (what ucd-snmp has morphed
into) depening on your OS version.  Most distributions come with them,
but they may not be installed by default.

Win2k and 2k3 ship with a basic SNMP service, which you have to enable
(or 'Add' via the Control Panel.)

The basic check_snmp command needs the Hostaddress (-H), OID to monitor
(-o) and the SNMP community
string (-C, typically 'public').

So for example, we have the basic ucd-snmp package installed on a Linux
box.  To monitor the load average,
the OID is ".1.3.6.1.4.1.2021.10.1.3.1"

You can test if you setup has worked by running 
/usr/local/nagios/libexec/check_snmp -H TARGET -o
.1.3.6.1.4.1.2021.10.1.3.1 -C public

Basically, the problem you run into is to map what you want with the OID
number.  To somewhat
get around this, if you have the standard MIBS.  You can run 'snmpwalk',
which comes with ucd-snmp and
net-snmp.  With net-snmp's snmpwalk, you can run "snmpwalk -v 1 -c
public HOSTNAME .iso" to
see all the information your device is exporting via SNMP.

To get you started, some common OIDs:

# Load averages.
OID    ucd_load1min         1.3.6.1.4.1.2021.10.1.3.1
OID    ucd_load5min         1.3.6.1.4.1.2021.10.1.3.2
OID    ucd_load15min        1.3.6.1.4.1.2021.10.1.3.3
 

# Memory stats
OID    ucd_memswapAvail     1.3.6.1.4.1.2021.4.4.0
OID    ucd_memrealAvail     1.3.6.1.4.1.2021.4.6.0
OID    ucd_memtotalAvail    1.3.6.1.4.1.2021.4.11.0
 

# Disk stats (Don't forget the instance number...)
OID    ucd_diskfree         1.3.6.1.4.1.2021.9.1.7
OID    ucd_diskused         1.3.6.1.4.1.2021.9.1.8
OID    ucd_diskpused        1.3.6.1.4.1.2021.9.1.9
 

# CPU Stats
OID    ucd_cpuUser          1.3.6.1.4.1.2021.11.9.0
OID    ucd_cpuSystem        1.3.6.1.4.1.2021.11.10.0
OID    ucd_cpuIdle          1.3.6.1.4.1.2021.11.11.0
OID    ucd_rawCpuUser       1.3.6.1.4.1.2021.11.50.0
OID    ucd_rawCpuNice       1.3.6.1.4.1.2021.11.51.0
OID    ucd_rawCpuSystem     1.3.6.1.4.1.2021.11.52.0
OID    ucd_rawCpuIdle       1.3.6.1.4.1.2021.11.53.0

These should be fairly common and static.

Keep in mind, that with the NAG, you will probably have to create your
own snmp checkcommand
using check_snmp and set the -w and -c stuff yourself.  

Later on, you can get more advance and have the SNMP daemon run scripts
and return the data via
an OID.  

Rob




-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of Subhendu
Ghosh
Sent: Friday, February 13, 2004 1:35 PM
To: Platt, Nicholas
Cc: 'nagios-users at lists.sourceforge.net'
Subject: Re: [Nagios-users] Monitoring Disk and CPU Utilization


On Fri, 13 Feb 2004, Platt, Nicholas wrote:

> Hello,
> 
> I've just installed Nagios and I am very please with the product.  I'm

> not a Linux guy, but the instructions have been so good that it has 
> been an easy experience.  Good work!  I've been able to populate the
NMS with 500+ host
> and monitor over 1000+ services.   I plan to grow it.   I've been
asked to
> monitor host CPU and host disk usage.    I've read that there is two
ways
> monitor this function.  One is installing a client on each server and
the
> other is SNMP.   Since our shop has several types of boxes and OS, for
us it
> is better to poll the box via SNMP.  I've not been able to find 
> detailed documentation on how to have Nagios poll via SNMP for disk 
> usage.  Now, when I say documentation, I have found a check_snmp
plug-in, but did not have
> enough documentation for a beginner to be able to utilize it.    Can
you
> point me to any check_snmp documentation that will clearly describe
how I
> can poll servers via SNMP?    If believe the client version is better,
will
> it support Unix, Linux, Novell, and NT?  You guys have always been 
> very supportive.  Thank you.


Unix agent: 
NRPE + any plugin
ssh + any plugin

Windows agents: 
NSclient - fixed set of probes
NREP_NT + external plugins

Novell:
MRTGEXT.NLM - fixed set of probes


-- 
-sg



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::: Messages without supporting info will risk being sent to /dev/null