Nagios Check - check_hw_sensors

check_hw_sensors plugin for Nagios monitors sysctl hw.sensors on OpenBSD

With the new sensor framework in OpenBSD 3.9, I wanted to be able to monitor the new hw.sensors from Nagios and this is what I have. The documentation is a bit thin and I don't know how reliable it is. I would be happy to accept patches. Send them to andrew+nagios@rraz.net. I know the docs aren't as good as I would like, so if there are places that need clarification, please let me know!

New in this release is the ability to check the sensors that report their status. Since many sensors support this, it can make the size of your sensorsd.conf much smaller. For example, check_hw_sensors will automatically check these two sensors:

hw.sensors.76=esm0, Fan 4, OK, fanrpm, 3629 RPM
hw.sensors.77=esm0, Fan 5, CRITICAL, fanrpm, 0 RPM

It will report the status listed to Nagios. For 76, it would be OK, for 77 it would be CRITICAL. You don't need to put anything in a config file to support those.

What I think is really kewl about this plugin is that it can use the same sensorsd.conf as sensorsd. That means that they can be easily kept in sync. But, since Nagios supports both warning and critical alerts, it turned out really handy that sensorsd ignores any additional capabilities in the file. The addtional capabilities check_hw_sensors supports are described below. If you have an /etc/sensorsd.conf with the checks you want, it can be run as simply as 'check_hw_sensors -f'. If you only want to check the sensors that report their status, you can ever run it as just 'check_hw_sensors'.

TODO:

need real documentation.
the RANGE using the colon to separate probably screws up the getcap of sensorsd.conf, so it should probably get replaced with a dash or somesuch

Download the current version here

Please be sure to support the OpenBSD project by purchasing CDs, T-shirts, or making a donation.
These finances ensure that OpenBSD will continue to exist, and will remain free for everyone to use and reuse as they see fit.

    check_hw_sensors [-i] (-f [<FILENAME>]|(-s <hw.sensors id> [-w limit] [-c limit]))

Usage:
    -i, --ignore-status
        Don't check the status of sensors that report it.
    -f, --filename=FILE
        FILE to load checks from (defaults to /etc/sensorsd.conf)
    -s, --sensor=ID
        ID of a single sensor.  "-s 0" means hw.sensors.0.
    -w, --warning=RANGE or single ENTRY
        Exit with WARNING status if outside of RANGE or if != ENTRY
    -c, --critical=RANGE or single ENTRY
        Exit with CRITICAL status if outside of RANGE or if != ENTRY

FILE is in the same format as sensorsd.conf(5) plus some additional entries. These additional entries in the file are ignored by sensorsd(8).

check_hw_sensors understands the following entries:
low, high, crit, warn, crit.low, crit.high, warn.low, warn.high, ignore, status

An ENTRY depends on the type. The descriptions in sensorsd.conf(5) can be used when appropriate, or you can use the following:

volts_dc, fanrpm or raw
Anything that includes digits. Both the value of the check and the value of the sensor response that are not either a digit or period are stripped and then the two resultant values are compared.
temp
Can be as above, but if the entry has an F in it, it compares farenheit, otherwise it uses celcius.
indicator or drive
does a case sensitive match of each entry in the comma separated list and if it does not match any of the entries, it matches the status. Does not support any low or high entries.

The entries 'crit' or 'warn' (or the -c or -w on the command line) may be a RANGE or a comma separated list of acceptable values. The comma separated list of values contains a list of things that will NOT cause the status. This is possibly counterintuitive, but you are more likely to know good values than bad values.

A RANGE is a low ENTRY and a high ENTRY separated by a colon (:). It can also be low: or :high with the other side left blank to only make the single check..

An entry marked "ignore" will cause that sensor to be skipped. Generally used with status checking of all sensors to ignore sensors you don't care about or that report incorrectly.

If you are using --ignore-status, you can still check the status of individual sensors with a status entry.

check_hw_sensors (nagios-plugins 1.4.2) 1.17
The nagios plugins come with ABSOLUTELY NO WARRANTY. You may redistribute copies of the plugins under the terms of the GNU General Public License. For more information about these matters, see the file named COPYING.

Example sensorsd.conf

# hw.sensors.3=esm0, Ambient, OK, temp, 21.50 degC / 70.70 degF
hw.sensors.3:high=28C:warn.high=25C

# hw.sensors.12=esm0, Chassis Intrusion, indicator, Off
hw.sensors.12:warn=Off

# hw.sensors.29=esm0, Drive 0, drive, online
hw.sensors.29:crit=online
# hw.sensors.30=esm0, Drive 1, drive, online
hw.sensors.30:crit=online
# hw.sensors.31=esm0, Drive 2, drive, unknown
# hw.sensors.32=esm0, Drive 3, drive, unknown
# hw.sensors.33=esm0, Drive 4, drive, online
hw.sensors.33:crit=online
# hw.sensors.34=esm0, Drive 5, drive, online
hw.sensors.34:crit=online
# hw.sensors.35=esm0, Drive 6, drive, unknown
# hw.sensors.36=esm0, Drive 7, drive, unknown

# hw.sensors.70=esm0, Power Supply 1 AC, indicator, On
hw.sensors.70:crit=On
# hw.sensors.71=esm0, Power Supply 1 SW, indicator, On
hw.sensors.71:crit=On
# hw.sensors.72=esm0, Power Supply 1 OK, indicator, On
hw.sensors.72:crit=On
# hw.sensors.74=esm0, Power Supply 1 FFAN, indicator, Off
hw.sensors.74:crit=Off
# hw.sensors.75=esm0, Power Supply 1 OTMP, indicator, Off
hw.sensors.75:crit=Off

# hw.sensors.76=esm0, Power Supply 2 AC, indicator, On
hw.sensors.76:crit=On
# hw.sensors.77=esm0, Power Supply 2 SW, indicator, On
hw.sensors.77:crit=On
# hw.sensors.78=esm0, Power Supply 2 OK, indicator, On
hw.sensors.78:crit=On
# hw.sensors.80=esm0, Power Supply 2 FFAN, indicator, Off
hw.sensors.80:crit=Off
# hw.sensors.81=esm0, Power Supply 2 OTMP, indicator, Off
hw.sensors.81:crit=Off

# hw.sensors.82=esm0, Power Supply 3 AC, indicator, On
hw.sensors.82:crit=On
# hw.sensors.83=esm0, Power Supply 3 SW, indicator, On
hw.sensors.83:crit=On
# hw.sensors.84=esm0, Power Supply 3 OK, indicator, On
hw.sensors.84:crit=On
# hw.sensors.86=esm0, Power Supply 3 FFAN, indicator, Off
hw.sensors.86:crit=Off
# hw.sensors.87=esm0, Power Supply 3 OTMP, indicator, Off
hw.sensors.87:crit=Off

# hw.sensors.88=esm0, Fan 1, CRITICAL, fanrpm, 0 RPM
hw.sensors.88:ignore
# hw.sensors.89=esm0, Fan 2, CRITICAL, fanrpm, 0 RPM
hw.sensors.89:ignore
# hw.sensors.90=esm0, Fan 3, CRITICAL, fanrpm, 0 RPM
hw.sensors.90:ignore
# hw.sensors.91=esm0, Fan 4, CRITICAL, fanrpm, 0 RPM
hw.sensors.91:ignore
# hw.sensors.92=esm0, Fan 5, CRITICAL, fanrpm, 0 RPM
hw.sensors.92:ignore
# hw.sensors.93=esm0, Fan 6, CRITICAL, fanrpm, 0 RPM
hw.sensors.93:ignore

Example output from sysctl hw.sensors from that box

hw.sensors.0=esm0, CPU 1, OK, temp, 36.00 degC / 96.80 degF
hw.sensors.1=esm0, CPU 2, OK, temp, 41.00 degC / 105.80 degF
hw.sensors.2=esm0, Mainboard, OK, temp, 28.00 degC / 82.40 degF
hw.sensors.3=esm0, Ambient, OK, temp, 21.50 degC / 70.70 degF
hw.sensors.4=esm0, CPU 1 Core, OK, volts_dc, 1.65 V
hw.sensors.5=esm0, CPU 2 Core, OK, volts_dc, 1.67 V
hw.sensors.6=esm0, Motherboard +5V, OK, volts_dc, 4.98 V
hw.sensors.7=esm0, Motherboard +12V, OK, volts_dc, 11.97 V
hw.sensors.8=esm0, Motherboard +3.3V, OK, volts_dc, 3.25 V
hw.sensors.9=esm0, Motherboard +2.5V, OK, volts_dc, 2.49 V
hw.sensors.10=esm0, Motherboard GTL Term, OK, volts_dc, 1.50 V
hw.sensors.11=esm0, Motherboard Battery, OK, volts_dc, 2.92 V
hw.sensors.12=esm0, Chassis Intrusion, indicator, Off
hw.sensors.13=esm0, Chassis Fan Ctrl, raw, 2
hw.sensors.14=esm0, Fan 1, OK, fanrpm, 3839 RPM
hw.sensors.15=esm0, Fan 2, OK, fanrpm, 4040 RPM
hw.sensors.16=esm0, Backplane Control, raw, 227
hw.sensors.17=esm0, Backplane Top, OK, temp, 30.00 degC / 86.00 degF
hw.sensors.18=esm0, Backplane Bottom, OK, temp, 29.50 degC / 85.10 degF
hw.sensors.19=esm0, Backplane +5V, OK, volts_dc, 4.97 V
hw.sensors.20=esm0, Backplane +12V, OK, volts_dc, 12.06 V
hw.sensors.21=esm0, Backplane Board, OK, volts_dc, 2.83 V
hw.sensors.22=esm0, Backplane Fan Control, raw, 8738
hw.sensors.23=esm0, Backplane Fan 1, OK, fanrpm, 3690 RPM
hw.sensors.24=esm0, Backplane Fan 2, OK, fanrpm, 3552 RPM
hw.sensors.25=esm0, Backplane Fan 3, OK, fanrpm, 3505 RPM
hw.sensors.26=esm0, Backplane SCSI A Connected, indicator, On
hw.sensors.27=esm0, Backplane SCSI A External, OK, volts_dc, 4.68 V
hw.sensors.28=esm0, Backplane SCSI A Internal, OK, volts_dc, 4.79 V
hw.sensors.29=esm0, Drive 0, drive, online
hw.sensors.30=esm0, Drive 1, drive, online
hw.sensors.31=esm0, Drive 2, drive, unknown
hw.sensors.32=esm0, Drive 3, drive, unknown
hw.sensors.33=esm0, Drive 4, drive, online
hw.sensors.34=esm0, Drive 5, drive, online
hw.sensors.35=esm0, Drive 6, drive, unknown
hw.sensors.36=esm0, Drive 7, drive, unknown
hw.sensors.37=esm0, Power Supply 1 +5V, volts_dc, 5.07 V
hw.sensors.38=esm0, Power Supply 1 +12V, volts_dc, 12.13 V
hw.sensors.39=esm0, Power Supply 1 +3.3V, volts_dc, 3.32 V
hw.sensors.40=esm0, Power Supply 1 -5V, volts_dc, 5.08 V
hw.sensors.41=esm0, Power Supply 1 -12V, volts_dc, 12.20 V
hw.sensors.42=esm0, Power Supply 2 +5V, volts_dc, 5.09 V
hw.sensors.43=esm0, Power Supply 2 +12V, volts_dc, 12.08 V
hw.sensors.44=esm0, Power Supply 2 +3.3V, volts_dc, 3.34 V
hw.sensors.45=esm0, Power Supply 2 -5V, volts_dc, 5.01 V
hw.sensors.46=esm0, Power Supply 2 -12V, volts_dc, 12.03 V
hw.sensors.47=esm0, Power Supply 3 +5V, volts_dc, 5.03 V
hw.sensors.48=esm0, Power Supply 3 +12V, volts_dc, 12.15 V
hw.sensors.49=esm0, Power Supply 3 +3.3V, volts_dc, 3.34 V
hw.sensors.50=esm0, Power Supply 3 -5V, volts_dc, 5.03 V
hw.sensors.51=esm0, Power Supply 3 -12V, volts_dc, 11.97 V
hw.sensors.52=esm0, System Power Supply +5V, volts_dc, 5.02 V
hw.sensors.53=esm0, System Power Supply +12V, volts_dc, 12.09 V
hw.sensors.54=esm0, System Power Supply +3.3V, volts_dc, 3.32 V
hw.sensors.55=esm0, System Power Supply -5V, volts_dc, 4.91 V
hw.sensors.56=esm0, System Power Supply -12V, volts_dc, 11.82 V
hw.sensors.57=esm0, System Power Supply +5V aux, volts_dc, 5.16 V
hw.sensors.58=esm0, Power Supply 1 +5V, OK, amps, 2.40 A
hw.sensors.59=esm0, Power Supply 1 +12V, OK, amps, 1.00 A
hw.sensors.60=esm0, Power Supply 1 +3.3V, OK, amps, 1.80 A
hw.sensors.61=esm0, Power Supply 2 +5V, OK, amps, 2.80 A
hw.sensors.62=esm0, Power Supply 2 +12V, OK, amps, 1.20 A
hw.sensors.63=esm0, Power Supply 2 +3.3V, OK, amps, 1.60 A
hw.sensors.64=esm0, Power Supply 3 +5V, OK, amps, 1.20 A
hw.sensors.65=esm0, Power Supply 3 +12V, OK, amps, 1.00 A
hw.sensors.66=esm0, Power Supply 3 +3.3V, OK, amps, 1.60 A
hw.sensors.67=esm0, Power Supply 1 Fan, OK, fanrpm, 3726 RPM
hw.sensors.68=esm0, Power Supply 2 Fan, OK, fanrpm, 4042 RPM
hw.sensors.69=esm0, Power Supply 3 Fan, OK, fanrpm, 3606 RPM
hw.sensors.70=esm0, Power Supply 1 AC, indicator, On
hw.sensors.71=esm0, Power Supply 1 SW, indicator, On
hw.sensors.72=esm0, Power Supply 1 OK, indicator, On
hw.sensors.73=esm0, Power Supply 1 ON, OK, indicator, On
hw.sensors.74=esm0, Power Supply 1 FFAN, indicator, Off
hw.sensors.75=esm0, Power Supply 1 OTMP, indicator, Off
hw.sensors.76=esm0, Power Supply 2 AC, indicator, On
hw.sensors.77=esm0, Power Supply 2 SW, indicator, On
hw.sensors.78=esm0, Power Supply 2 OK, indicator, On
hw.sensors.79=esm0, Power Supply 2 ON, OK, indicator, On
hw.sensors.80=esm0, Power Supply 2 FFAN, indicator, Off
hw.sensors.81=esm0, Power Supply 2 OTMP, indicator, Off
hw.sensors.82=esm0, Power Supply 3 AC, indicator, On
hw.sensors.83=esm0, Power Supply 3 SW, indicator, On
hw.sensors.84=esm0, Power Supply 3 OK, indicator, On
hw.sensors.85=esm0, Power Supply 3 ON, OK, indicator, On
hw.sensors.86=esm0, Power Supply 3 FFAN, indicator, Off
hw.sensors.87=esm0, Power Supply 3 OTMP, indicator, Off
hw.sensors.88=esm0, Fan 1, CRITICAL, fanrpm, 0 RPM
hw.sensors.89=esm0, Fan 2, CRITICAL, fanrpm, 0 RPM
hw.sensors.90=esm0, Fan 3, CRITICAL, fanrpm, 0 RPM
hw.sensors.91=esm0, Fan 4, CRITICAL, fanrpm, 0 RPM
hw.sensors.92=esm0, Fan 5, CRITICAL, fanrpm, 0 RPM
hw.sensors.93=esm0, Fan 6, CRITICAL, fanrpm, 0 RPM
hw.sensors.94=esm0, Fan Enclosure, raw, 42498
hw.sensors.95=safte0, fan0, OK, indicator, On
hw.sensors.96=safte0, fan1, OK, indicator, On
hw.sensors.97=safte0, fan2, OK, indicator, On
hw.sensors.98=safte0, temp0, OK, temp, 30.00 degC / 86.00 degF
hw.sensors.99=safte0, temp1, OK, temp, 29.44 degC / 85.00 degF

Andrew Fresh <andrew@mad-techies.org>

$RedRiver: index.html,v 1.3 2006/05/04 01:39:16 andrew Exp $

Nagios Check - check_hw_sensors

Please be sure to support the OpenBSD project by purchasing CDs, T-shirts, or making a donation. These finances ensure that OpenBSD will continue to exist, and will remain free for everyone to use and reuse as they see fit.

Example sensorsd.conf

Example output from sysctl hw.sensors from that box

Please be sure to support the OpenBSD project by purchasing CDs, T-shirts, or making a donation.
These finances ensure that OpenBSD will continue to exist, and will remain free for everyone to use and reuse as they see fit.