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Check free disk space with snmp

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with this simple nagios plugin you can check the free space of every harddisk. You can also pass parameters for warning and critical, when the percentage of the used space goes higher than your supplied levels
Add something like

command[check_hd]=/usr/lib/nagios/plugins/check_hd $HOSTADDRESS$ public $ARG1$ $ARG2$ $ARG3$

to your command.cfg

also add something like

define command{

command_name check_hd

command_line $USER1$/check_hd $HOSTADDRESS$ public $ARG1$ $ARG2$ $ARG3$


to your checkcommands.cfg

by using the lines

define service{

use generic-service

host_name YOURHOST

service_description SERVICENAME

is_volatile 0

check_period 24x7

max_check_attempts 3

normal_check_interval 60

retry_check_interval 1

contact_groups admins

notification_interval 240

notification_period 24x7

notification_options c,r

check_command check_hd!40!60!C


you can activate checks for disc C on YOURHOST. You will receive warnings, if percentage of used space reaches 40 perc. and you will receive a critical fail if percentage of used discspace reaches 60 perc.
Reviews (1)
bynikonier, July 15, 2013
after installing the plugin I got an error:
(Service check did not exit properly)

after some "googling" I modified my entry in the commands.cfg:
command_line /usr/bin/perl $USER1$/check_hd $HOSTADDRESS$ public $ARG1$ $ARG2$ $ARG3$

everything works, but I don't like the output:
OK: hd C in use 5.19659161907092 perc and 529.744556427002 GB free w-40 c-60

so I did some more modifications. edit the plugin check_hd:
around Line 72:
$freespace=$fullsize1 - $usedsize1;
$freespace=$freespace / 1024 / 1024 / 1024;
$freespace = sprintf("%.2f", $freespace);
$percfilled=$usedsize1 * 100 / $fullsize1;
$percfilled = sprintf("%.2f", $percfilled);

ADD the commands with the sprintf command.

output now:
OK: hd C in use 5.20 perc and 529.74 GB free w-40 c-60