CentOS 6.4x64 Nagios monitoring platform: monitors the CPU temperature of Linux Hosts

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The data center does not have a temperature alarm device. I use this method to control the temperature of the data center. If there is only one alarm, a single machine failure can be considered. If there are several alarms at the same time, it can be considered that there is a problem with the air conditioner in the data center.

The specific implementation method is as follows:

Environment: monitored: CentOS 6.4

1. install hardware sensor monitoring software sensors
# Yum install lm_sensors *

2. Run sensors-detect for Sensor Detection

# Sensors-detect # Press enter all the way. In this step, I will report an error under the virtual machine, but there is no problem on the physical machine.

3. Run sensors to check whether data can be read, as shown below:

[Root @ rd02 ~] # Sensors

Coretemp-isa-0000

Adapter: ISA adapter

Core 0: + 32.0 °C (high = + 76.0 °C, crit = + 100.0 °C)

Core 1: + 32.0 °C (high = + 76.0 °C, crit = + 100.0 °C)

4. # vi/usr/local/nagios/libexec/check_cputemp # paste the content between the following #

######################################## ##################

#! /Bin/sh

######### Check_cputemp ###########

# Date: May 1, 2011

# Licence GPLv2

# INSTALLATION

# The script need to install lm_sensors

# Sensors's output need like below format

######################################## #

# Coretemp-isa-0000 #

# Adapter: ISA adapter #

# Core 0: + 27 °C (high = + 85 °C )#

#

# Coretemp-isa-0001 #

# Adapter: ISA adapter #

# Core 1: + 25 °C (high = + 85 °C )#

######################################## #

# You can use NRPE to define service in nagios

# Check_nrpe! Check_cputemp.sh

# Plugin return statements

STATE_ OK = 0

STATE_WARNING = 1

STATE_CRITICAL = 2

STATE_UNKNOWN = 3

Print_help_msg (){

$ Echo "Usage: $0-h to get help ."

}

Print_full_help_msg (){

$ Echo "Usage :"

$ Echo "$0 [-v]-m sensors-w cpuT-c cpuT"

$ Echo "Sepicify the method to use the temperature data sensors ."

$ Echo "And the corresponding Critical value must greater than Warning value ."

$ Echo "Example :"

$ Echo "$ {0}-m sensors-w 40-c 50 ″

}

Print_err_msg (){

$ Echo "Error ."

Print_full_help_msg

}

To_debug (){

If ["$ Debug" = "true"]; then

$ Echo "$ *">/var/log/check_sys_temperature.log. $2> & 1

Fi

}

Unset LANG

Echo = "echo-e"

If [$ #-lt 1]; then

Print_help_msg

Exit 3

Else

While getopts: vhm: w: c: OPTION

Do

Case $ OPTION

In

V)

# $ Echo "Verbose mode ."

Debug = true

;;

M)

Method = $ OPTARG

;;

W)

WARNING = $ OPTARG

;;

C)

CRITICAL = $ OPTARG ;;

H)

Print_full_help_msg

Exit 3

;;

?)

$ Echo "Error: Illegal Option ."

Print_help_msg

Exit 3

;;

Esac

Done

If ["$ method" = "sensors"]; then

Use_sensors = "true"

To_debug use_sensors

Else

$ Echo "Error. Must to sepcify the method to use sensors ."

Print_full_help_msg

Exit 3

Fi

To_debug All Values are \ "Warning:" $ WARNING "and Critical:" $ CRITICAL "\".
Fi

######### Lm_sensors ##################

If ["$ use_sensors" = "true"]; then

SensorsCheckOut = 'which sensors 2> & 1'

If [$? -Ne 0]; then

Echo $ sensorsCheckOut

Echo Maybe you need to check your sensors.

Exit 3

Fi

To_debug Use $ sensorsCheckOut to check system temperature

TEMP1 = 'sensors | head-3 | tail-1 | gawk '{print $3}' | grep-o [0-9] [0-9]'

TEMP2 = 'sensors | head-4 | tail-1 | gawk '{print $3}' | grep-o [0-9] [0-9]'

SUM = $ ($ TEMP1 + $ TEMP2 ))

TEMP = $ ($ SUM/2 ))

If [-z "$ TEMP"]; then

$ Echo "No Data been get here. Please confirm your ARGS and re-check it with Verbose mode, then to check the log ."

Exit 3

Fi

To_debug temperature data is $ TEMP

Else

$ Echo "Error. Must to sepcify the method to use sensors"

Print_full_help_msg

Exit 3

Fi

######## Comparaison with the warnings and criticals thresholds given by user ############

CPU_TEMP = $ TEMP

# If ["$ WARNING "! = "0"] | ["$ CRITICAL "! = "0"]; then

If ["$ CPU_TEMP"-gt "$ CRITICAL"] & ["$ CRITICAL "! = "0"]; then

STATE = "$ STATE_CRITICAL"

STATE_MESSAGE = "CRITICAL"

To_debug $ STATE, Message is $ STATE_MESSAGE

Elif ["$ CPU_TEMP"-gt "$ WARNING"] & ["$ WARNING "! = "0"]; then

STATE = "$ STATE_WARNING"

STATE_MESSAGE = "WARNING"

To_debug $ STATE, Message is $ STATE_MESSAGE

Else

STATE = "$ STATE_ OK"

STATE_MESSAGE = "OK"

To_debug $ STATE, Message is $ STATE_MESSAGE

Fi

Echo "The TEMPERATURE" $ STATE_MESSAGE "-" The CPU's Temperature is "$ CPU_TEMP" °C !"

Exit $ STATE

######################################## ##################

5. Grant the preceding script execution permission:

# Chmod + x/usr/local/nagios/libexec/check_cputemp

6. Configure nrpe. cfg and add the following line:

Command [check_cputemp] =/usr/local/nagios/libexec/check_cputemp-m sensors-w 38-c 45

Note: The preceding six steps are completed on the monitored machine.

7. Configure the service on the Nagios Server:

Define service {

Use generic-service

Host_name

Service_description CPU Temperature

Check_command check_nrpe! Check_cputemp

}

Save and restart the nagios service.

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