HDD temperature in Munin with smartmontools

smartctl_hddtemp_

#!/bin/bash
#
# Configuration
# -------------
# [smartctl_hddtemp_*]
#  user root
#  group root
#  env.attribute 194 # Id of SMART attribute, you probably want to use 194. http://en.wikipedia.org/wiki/S.M.A.R.T.#Known_ATA_S.M.A.R.T._attributes
#  env.warning 50 # The environment variables "warning" and "critical" sets the temperature from which Munin starts to warn.
#  env.critical 55
#
# Requirements
# ------------
#   - smartmontools installed
#   - symlink containing target device eg. smartctl_hddtemp_ -> smartctl_hddtemp_sda

. $MUNIN_LIBDIR/plugins/plugin.sh

HDD=${0##*smartctl_hddtemp_}

if [ -n "$attribute" ] && [[ $warning =~ ^-?[0-9]+$ ]]; then
	ATTRIBUTE_ID="$attribute"
else
	ATTRIBUTE_ID="194"
fi


if [ "$1" = 'config' ]; then
        echo "graph_args --lower-limit 0 --upper-limit 100 --rigid"
        echo "graph_title HDD temperature $HDD"
        echo "graph_category disk"
        echo "graph_vlabel Degrees Celsius"
        
        echo "temp.label $HDD"
        echo "temp.draw AREA"
        echo "temp.colour COLOUR20"
        
        if [ -n "$warning" ] && [[ $warning =~ ^-?[0-9]+$ ]]; then
        	echo "temp.warning $warning"
        fi
        
        if [ -n "$critical" ] && [[ $critical =~ ^-?[0-9]+$ ]]; then
        	echo "temp.critical $critical"
        fi
        
fi

TEMPERATURE=$(smartctl -d auto -A /dev/sdb |sed -n '/^.*START OF READ SMART DATA SECTION/,$p' |sed -n -e "s/^${ATTRIBUTE_ID} //p" |awk '{ print $3 }' |sed 's/^0*//')
echo "temp.value $TEMPERATURE"

exit 0

Thanks for the script. I spotted a few typos:

• Change sdb at line 48 to $HDD for this script to run with the drive specified through the magic of the filename
• Also, line 21, it probably should be $attribute and not $warning in the second part of the test