HP Procurve SNMP monitor

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NOTE ADDED ON 10th December 2016:
Many people confirmed that the plugin doesn't work with newer HP firmwares. HP has removed (or obscured) the info about the health status of Procurve switches from SNMP OIDs so, unfortunately, the plugin is to be considered outdated and doesn't work with newer gear.

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NOTE ADDED ON 14TH June 2016:
It seems that newer HP firmwares change the OIDs of some switches, by hiding the hardware health status of the components. This unfortunately renders the script useless.

If you see that the plugin doesn't work anymore try these commands; they should give the following output. Otherwise it might be that the hardware info is saved elsewhere in the OID or HP decided to totally hide them from SNMP queries, in which case there's nothing I can do to make it work.

$ snmpwalk -v 2c -c public 10.10.10.1 .1.3.6.1.4.1.11.2.14.11.1.2.6.1.7

SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.1 = STRING: "Fan Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.2 = STRING: "Power Supply 1 Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.3 = STRING: "Power Supply 2 Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.4 = STRING: "Power Supply 3 Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.5 = STRING: "Power Supply 4 Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.6 = STRING: "RPS Power Supply Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.7 = STRING: "Over-temperature Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.8 = STRING: "External Power Supply 1 Sensor"
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.7.9 = STRING: "External Power Supply 2 Sensor"

$ snmpwalk -v 2c -c public 10.10.10.1 .1.3.6.1.4.1.11.2.14.11.1.2.6.1.4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.1 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.2 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.3 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.4 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.5 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.6 = INTEGER: 5
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.7 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.8 = INTEGER: 4
SNMPv2-SMI::enterprises.11.2.14.11.1.2.6.1.4.9 = INTEGER: 4
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The plugin uses 'snmpwalk' and 'snmpget' commands, so you have to add them; for instance in Ubuntu they are in the 'snmp' package:
$ sudo apt-get install snmp

Just copy the plugin in the right directory, e.g.:
/usr/lib/nagios/plugins/
and remember to make the file executable.

Then in /etc/nagios3/commands.cfg add:

define command {
command_name check_snmp_hp-procurve
command_line $USER1$/check_snmp_hp-procurve.sh public $HOSTADDRESS$
}

and in Nagios services' definition file:

define service {
hostgroup_name switches
service_description HP-hw
check_command check_snmp_hp-procurve
use generic-service
notification_period work
}

That's it.