using nagios check_snmp plugin to get snmp info from computer

umarzuki · 08-29-2009, 07:39 AM

by manually run
# ./check_snmp -H 192.168.56.2 -C public -P 1 -o HOST-RESOURCES-MIB::hrDiskStorageCapacity.6

i can get snmp data, but how to define that check as check_command in a computer/host config file?

kirukan · 08-29-2009, 01:59 PM

I don't know the purpose why you are checking whole disk capacity(is there disk array?) because usually we are checking disk usage, however refer the following site
http://nagios.manubulon.com/index_co...html#interface

umarzuki · 09-08-2009, 03:12 AM

Finally, I found a way to get snmp info from a host

Run snmpwalk to view OID name
Code:
```
snmpwalk -v 1 -c public 192.168.56.1
```
Note that public is the community string and 1 is the SNMP version
Pick one, ie: SNMPv2-MIB::sysContact.0 (sysadmin mail address)

Use snmptranslate to get OID number

Code:

snmptranslate -On SNMPv2-MIB::sysContact.0

Check the OID number with check_snmp manually

Code:

./check_snmp -H 192.168.56.1 -C public -o .1.3.6.1.2.1.1.4.0

Take note of check_snmp options and arguments, then define/edit a command
Code:
```
define command{
        command_name    check_snmp
        command_line    $USER1$/check_snmp -H $HOSTADDRESS$ -C public -o $ARG1$
        }
```
Note that $HOSTADDRESS$ is a macro so no need to fill that out since it will refer to current host config
Define a service for that
Code:
```
define service{
        use                             other-service
        host_name                       laptop
        service_description             Admin email
        check_command                   check_snmp!.1.3.6.1.2.1.1.4.0
        }
```
Since the first and second argument already filled out in command definition, we just need to add the last argument which is the OID number with exclamation mark (!) before it. Of course, other-service template is already defined.