SNMP and Nagios

[Max H.]

George Monappallil wrote:
> Does anybody have a detailed doc on how I can configure Nagios to use
> SNMP to monitor hosts and network equipment.
> Is there a way of getting info on remote hosts ( disks, cpu etc )
> without installing the NRPE or other addons on the remote hosts. Most of
> the time, it is not feasible to do so.
> 
> I have NET:SNMP installed on my Nagios ( 2.3.1) box (Solaris 9).
> 

Chances are if you can poll devices with SNMP, then someone has already 
written the plugins necessary to process that data.

Check out:

<http://www.nagiosexchange.org/>


check_snmp_disk.pl -- disk usage info
check_snmp_mem.pl  -- memory info
check_snmp_procs.pl -- processes info  and so on...

These kinds of plugins require a little more overhead for Nagios to 
process, but if you don't have a huge network to monitor it seems to 
work fine.

A lot of the plugins written to monitor these things are written in 
Perl, so you'll need Perl installed on the machine. An example of 
check_snmp_disk.pl in action would be:

In checkcommands.cfg:
# 'snmp_disk' Let's try to check for free space on remote disks
define command{
         command_name    snmp_disk
         command_line    $USER1$/check_snmp_disk.pl -H $HOSTADDRESS$ -C 
public -w $ARG1$ -c $ARG2$
         }

You'll have to specify the services to correspond in services.cfg, but 
hopefully this will get you started in the right direction.

Also to note, you'll need to specify the partitions or disks in the SNMP 
configuration files on your remote hosts. I'm not sure what Solaris does 
for SNMP, but for example in RHEL, under /etc/snmpd.conf you have to 
specify the parameters that SNMP is allowed to report.

Hopefully this gets you started!

Max


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