The following is a way to access the CPU and GPU temperature on a raspberry Pi using SNMP

Note – I am using Centos 7 on my Raspberry Pi

Edit  /etc/sysconfig/selinux

change the line:

SELINUX=enabled

to read

SELINUX=disabled

Save your changes

Create a file named /usr/local/sbin/cputemp and put the following in it

#!/bin/bash
cpu=$(</sys/class/thermal/thermal_zone0/temp)
echo print $cpu/1000 | /bin/perl
echo

chmod the file to be 755 and chown to root.root

Create a file named  /usr/local/sbin/gputemp

#!/bin/bash
gpu=$(/usr/bin/vcgencmd measure_temp)
echo $gpu | /bin/awk -F ‘=’ {‘print $2’} | /bin/awk -F “‘” {‘print $1’}

chmod the file to be 755 and chown to root.root

yum -y install net-snmp

edit the file /etc/snmp/snmpd.conf file and add the following two lines to the end

extend cputemp /usr/local/sbin/cputemp
extend gputemp /usr/local/sbin/gputemp

Scroll up the snmpd.conf file and find the lines that start with

view systemvew included....

and add the following line:

view systemview included .1.3.6.1.4.1.8072.1.3.2

save your changes and exit your editor

execute

systemctl enable snmpd

edit iptables or ipchains (which ever you are using) to permit inbound udp traffic to port 161

Important: Remote the pi now

Then you can test it from another computer that has net-snmp-utils installed:

[user@desktop ~]$ snmpwalk -v 1 -c public MyPiIPAddress nsExtendOutLine
NET-SNMP-EXTEND-MIB::nsExtendOutLine.”cputemp”.1 = STRING: 49.388
NET-SNMP-EXTEND-MIB::nsExtendOutLine.”gputemp”.1 = STRING: 49.9

Now you can use nagios, cacti or any of your other favorite snmp based monitoring systems to watch your pi’s temp

Last Updated on July 12, 2018 at 2:56 pm