Monitoring temperature of a Raspberry Pi with Cacti and perl

[lulu62]

Hello All,

My Pi2 is running Raspbian and I've installed Cacti 0.8.8b with apt-get.
Cacti works well with the default graphs and some others I've added later on (I'm monitoring my Ubiquiti EdgeRouter).
Now I'm trying to monitor the Pi's temperature with the following perl script:

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#!/usr/bin/perl
delete @ENV{qw(PATH)};
$ENV{PATH} = "/usr/bin:/bin";
$path = $ENV{'PATH'};
 
open(PROCESS, "/opt/vc/bin/vcgencmd measure_temp |");
$avg = <PROCESS>;
close(PROCESS);
 
$avg =~ s/^.*=(\d{2}\.\d)'?C?$//;
 
print "$1";

I found the script here: http://sq4ind.eu/cacti-template-to-moni ... ment-22154

I followed the installation steps very carefully but I'm still not able to get the temperature data in the graph.
When I run the perl script,

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sudo perl temp_rpi.pl

I get a good temperature value in return however when the cacti poller does it, it returns an error:

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CMDPHP: Poller[0] Host[1] DS[8] WARNING: Result from CMD not valid. Partial Result: U

If I change the last line of the script:

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print “$1”;

to

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print “40”;

It works, the temperature data is inserted in the graph.

What should I do?