I needed to monitor some volumes on some Windows Server 2016 machines with Nagios, including some volumes with mount points rather than drive letters. The Check WMI Plus plugin got me close, but it was only able to natively monitor drives with letters assigned. Luckily, Check WMI Plus allows for custom checks using ini files, so I set up a custom ini file in /etc/check_wmi_plus/check_wmi_plus.d:
[myStorage diskUsed] # this help is displayed only when -m MODE or -m MODE -s SUBMODE are specified AND --inihelp is used on the command line inihelp=<<EOT Get disk percentage used. arg1 is path to the mount point. Example: C: or E:\DB\DB1\ EOT query=Select Name,Capacity,FreeSpace from Win32_Volume where name = "{_arg1}" # Calculate percent full customfield=PercentFree,percent,FreeSpace,Capacity,%.1f, customfield=PercentUsed,basicmaths,100,-,PercentFree,%.1f, # allow warning/critical for PercentFull test=PercentUsed display=_DisplayMsg||~|~| - || display=PercentUsed |
My nagios check looks like this:
define service{
use snmp-disk-service
host_name exchange3
service_description disk used EX3-JDB-01
contact_groups exchange-admins
check_command check_wmi_disk!C:\\\\Mount Point\\\\!90!95
}
The slashes in the path needs to be escaped twice because (I assume) the string is being interpreted by the check_wmi_plus.pl script and the wmic utility.
The check_wmi_disk definition is:
# Check disk used using WMI
# Arguments are: Mount point, warning percentage, critical percentage
#
define command {
command_name check_wmi_disk
command_line /usr/bin/perl $USER1$/wmi/check_wmi_plus.pl -H $HOSTADDRESS$ -u [Domain]/[Service Account Username] -p [Service Account Password] --IgnoreMyOutDatedPerlModuleVersions -m myStorage -s diskUsed -a '$ARG1$' -w $ARG2 -c $ARG3$
}