Monitoring Temperature and Fans with lm_sensors

How to install and configure lm_sensors for temp and fan monitoring

Install the lm_sensors package

sudo yum install lm_sensors or sudo apt install lm-sensors

Configure lm_sensors

Enter ‘YES’ for all prompts
Check what module: cat /etc/sysconfig/lm_sensors
Load the module: modprobe (module name)

Check temperature and fan data

(in Fahrenheit): sensors -f

lm_sensors -

lm_sensors Manual Page

Usage: sensors [OPTION]... [CHIP]...
-c, --config-file     Specify a config file (default: /etc/sensors.conf)
-h, --help            Display this help text
-s, --set             Execute `set' statements (root only)
-f, --fahrenheit      Show temperatures in degrees fahrenheit
-A, --no-adapter      Do not show adapter for each chip
-U, --no-unknown      Do not show unknown chips
-u, --unknown         Treat chips as unknown ones (testing only)
-v, --version         Display the program version Use `-' after `-c' to read the config file from stdin.
If no chips are specified, all chip info will be printed.
Example chip names:
lm78-i2c-0-2d   *-i2c-0-2d
lm78-i2c-0-*    *-i2c-0-*
lm78-i2c-*-2d   *-i2c-*-2d
lm78-i2c-*-*    *-i2c-*-*
lm78-isa-0290   *-isa-0290
lm78-isa-*      *-isa-*

Configure monitoring

Write a script to cron or check via Nagios/nrpe. This can be as simple or complex as you like. I like to use something like this since it checks each temp individually, and has a separate threshold for each in a single script:


# By techpain 2012-12-11
# Check temperatures

TEMP1=$(sensors -f | grep -A3 'k8temp-pci-00c3' | grep Core0 | awk '{print $3}' | sed 's/\+//' | sed 's/.\{4\}$//')
TEMP2=$(sensors -f | grep -A3 'k8temp-pci-00c3' | grep Core1 | awk '{print $3}' | sed 's/\+//' | sed 's/.\{4\}$//')
TEMP3=$(sensors -f | grep -A3 'k8temp-pci-00cb' | grep Core0 | awk '{print $3}' | sed 's/\+//' | sed 's/.\{4\}$//')
TEMP4=$(sensors -f | grep -A3 'k8temp-pci-00cb' | grep Core1 | awk '{print $3}' | sed 's/\+//' | sed 's/.\{4\}$//')

if [ $TEMP1 -le 85 ] && [ $TEMP2 -le 75 ] && [ $TEMP3 -le 100 ] && [ $TEMP4 -le 100 ]
echo "OK - $TEMP1,$TEMP2,$TEMP3,$TEMP4 - cool as the other side of the pillow"
exit 0
logger "WARN - $TEMP1,$TEMP2,$TEMP3,$TEMP4 - it's getting hot in here"
echo "WARN - $TEMP1,$TEMP2,$TEMP3,$TEMP4 - it's getting hot in here"
exit 1

lm_sensors monitoring script output -


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