.::: Enable CPU Temperature Information on Linux (Rhel6/Centos6),(Rhel7/Centos7) Using lm_sensors :::.

lm_sensors (Linux monitoring sensors) is a free and open-source application that provides tools and drivers for monitoring temperatures, voltage, and fans. This document explains how to install, configure, and use lm_sensors.

A. Enable Temperature using lm_sensors

1. Download rpm lm_sensors if you using offline

For Rhel6/Centos6 Download rpm lm_sensors-3.1.1-17.el6.x86_64.rpm then copy to server

# wget  http://mirror.centos.org/centos/6/os/x86_64/Packages/lm_sensors-3.1.1-17.el6.x86_64.rpm

For Rhel7/Centos7 Download lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm, lm_sensors-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

# wget http://mirror.centos.org/centos/7/os/x86_64/Packages/lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

# wget https://www.rpmfind.net/linux/centos/7.4.1708/os/x86_64/Packages/lm_sensors-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

2. Installation

Offline Installation

Install patch for Rhel6.x/Centos6

# rpm -ivh lm_sensors-3.1.1-17.el6.x86_64.rpm

Install patch for Rhel7/Centos7

# rpm -qa | grep -i 'lm_sensors'

lm_sensors-libs-3.3.4-11.el7.x86_64

#

# rpm --nodeps -e lm_sensors-libs-3.3.4-11.el7.x86_64

# rpm -ivh lm_sensors-libs-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm lm_sensors-3.4.0-4.20160601gitf9185e5.el7.x86_64.rpm

Online Installation

# yum -y lm_sensors

or

# apt-get lm-sensors

3. Configuration

# sensors-detect

Do you want to scan for them? This is totally safe. (YES/no): YES

Do you want to scan for Super I/O sensors? (YES/no): YES

Do you want to scan for IPMI interfaces? (YES/no): YES

ISA slots! Do you want to scan the ISA I/O ports? (YES/no): YES

Do you want to probe the I2C/SMBus adapters now? (YES/no): YES

Do you want to scan it? (YES/no/selectively): YES

Just press ENTER to continue:

Do you want to overwrite /etc/sysconfig/lm_sensors? (YES/no): YES

4. get the temperature information

# sensors

power_meter-acpi-0

Adapter: ACPI interface

power1:       0.00 nW  (interval = 300.00 s)

coretemp-isa-0000

Adapter: ISA adapter

Physical id 0: +40.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 0:        +34.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 1:        +32.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 2:        +34.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 3:        +35.0°C  (high = +90.0°C, crit = +100.0°C) 

coretemp-isa-0004

Adapter: ISA adapter

Physical id 1: +43.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 0:        +36.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 1:        +36.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 2:        +37.0°C  (high = +90.0°C, crit = +100.0°C) 

Core 3:        +34.0°C  (high = +90.0°C, crit = +100.0°C) 

#

5. Create script temperature.sh for resume for example

#!/bin/bash

data=$(sensors | grep 'Core 0:' | awk '{print $3}' | cut -c2-3)

echo "0:"$data":OK!"

sample

[root@labs]# more temperature.sh

#!/bin/bash

data=$(sensors | grep 'Core 0:' | awk '{print $3}' | cut -c2-3)

echo "0:"$data":OK!"

[root@labs]#

[root@labs]# ./temperature.sh

0:39 43:OK!

[root@labs]#

B. Monitor to NMS

1. Create user SSH Create User access SSH on Linux (user: teguht  , password: teguhthebat)

# useradd teguht

# passwd teguht

Sample log

[root@Lab ~]# useradd teguht

[root@Lab ~]# passwd teguht

Changing password for user teguht.

New password:

Retype new password:

passwd: all authentication tokens updated successfully.

[root@Lab ~]#

2. Monitoring to NMS example PRTG

Create directory /var/prtg/scripts every device

# cd /var

# mkdir prtg

# cd prtg

# mkdir scripts

# cd scripts

Create script temperature.sh on directory /var/prtg/scripts

# cd /var/prtg/scripts

#!/bin/bash

data=$(sensors | grep 'Core 0:' | awk '{print $3}' | cut -c2-3)

echo "0:"$data":OK!"

#

sample

[root@labs]# more temperature.sh

#!/bin/bash

data=$(sensors | grep 'Core 0:' | awk '{print $3}' | cut -c2-3)

echo "0:"$data":OK!"

[root@labs]#

[root@labs]# ./temperature.sh

0:39 43:OK!

[root@labs]#

3. Make it executable

# chmod +x temperature.sh

# modprobe coretemp

4. Add sensor/measurement to device

Go to prtg, fill to below and save

Add Sensor = SSH Script

Choose script = temperature.sh

Unit String = Celsius

User Credential : teguht

Password = teguhthebat

5. if you want to remove

# yum -y remove lm_sensors

Tutorial 

https://rajivpandit.wordpress.com/2013/05/21/how-to-get-cpu-temperature-information-on-linux-centos-6-4-rhel/

https://gnt.md/en/networking/how-to-monitor-linux-cpu-temperature-with-teguht-sensor/

https://wiki.archlinux.org/index.php/lm_sensors