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Howtos — CPU and HD Temperature

This document describes the procedure on how to install and configure CPU an HD temperature monitoring system. Data yield from lm_sensors and hddtemp are forwarded to rrdtool for the processing of statiscal graph.

OS used: Linux (Fedora 9); tools used: lm_sensors, hddtemp, rrdtool, rrdtool-perl, and perl

Prepare perl, rrdtool, and rrdtool-perl

• Get and install Perl, rrdtool, rrdtool-perl:
  [1] Download above packages at http://download.fedora.redhat.com/pub/fedora/linux/releases/9/Fedora/x86_64/os/Packages, and install it by executing:
  # rpm -ivh perl-x.x.x.rpm rrdtool-x.x.x.rpm rrdtool-perl-x.x.x.rpm; or
  
  [2] If Fedora 9 DVD is present, install the package by executing these:
  # mount /dev/cdrom /mnt
  # rpm -ivh /mnt/Packages/perl-x.x.x.rpm
  # rpm -ivh /mnt/Packages/rrdtool-x.x.x.rpm
  # rpm -ivh /mnt/Packages/rrdtool-perl-x.x.x.rpm; or
  
  [3] If internet is availble, do the easy way by executing this:
  # yum install perl rrdtool rrdtool-perl.

Prepare lm_sensors

Please note that Fedora 9 comes with pre-installed lm_sensors.

• Get and install lm_sensors:
  [1] Download the package at http://download.fedora.redhat.com/pub/fedora/linux/releases/9/Fedora/x86_64/os/Packages, and install it by executing:
  # rpm -ivh lm_sensors-x.x.x.rpm; or
  
  [2] If Fedora 9 DVD is present, install the package by executing these:
  # mount /dev/cdrom /mnt
  # rpm -ivh /mnt/Packages/lm_sensors-x.x.x.rpm; or
  
  [3] If internet is available, do the easy way by executing this:
  # yum install lm_sensors.
• Create /etc/sysconfig/lm_sensors by executing this:
  # /usr/sbin/sensors-detect
  
  Just follow on-screen instructions.
• Permamently include lm_sensors during boot-up sequence by executing these:
  # /sbin/chkconfig --add lm_sensors
  # /sbin/chkconfig --level 12345 httpd off
  # /sbin/chkconfig --level 3 httpd on
  

Prepare hddtemp

• Get and install hddtemp:
  [1] Download the package at http://download.fedora.redhat.com/pub/fedora/linux/releases/9/Fedora/x86_64/os/Packages, and install it by executing:
  # rpm -ivh hddtemp-x.x.x.rpm; or
  
  [2] If Fedora 9 DVD is present, install the package by executing these:
  # mount /dev/cdrom /mnt
  # rpm -ivh /mnt/Packages/hddtemp-x.x.x.rpm; or
  
  [3] If internet is availble, do the easy way by executing this:
  # yum install hddtemp.

Create scripts

• Create /etc/rrdtool directory to store the scripts.
• Create /etc/rrdtool/cpu to extract CPU temperature. For /usr/bin/sensors that displays these lines:
  lm85-i2c-0-2c
  Adapter: SMBus I801 adapter at 0400
  ...
  CPU Temp: -128°C (low = +0°C, high = +65°C) FAULT
  ...
  lm85-i2c-0-2e
  Adapter: SMBus I801 adapter at 0400
  CPU Temp: +40°C (low = +0°C, high = +88°C)
  ...
  
  the following command is used:
  sensors | grep 'CPU Temp:' | awk '{print $3}' | sed -e 's/+//' -e 's/[^0-9+\.].*//' -e '1,1d'
• Create /etc/rrdtool/cputemp.pl script to create an RRD graph for the CPU temperature.
• Create /etc/rrdtool/hddtemp.pl script to create an RRD graph for the HDD temperature.

Initiate scripts every 5 minutes

• Edit /etc/crontab and add these lines:
  */5 * * * * root /etc/rrdtool/hddtemp.pl > /dev/null
  */5 * * * * root /etc/rrdtool/cputemp.pl > /dev/null
  
• Restart crond by executing this command:
  # /etc/rc.d/init.d/crond restart