Cacti custom perl script

Hey guys,

I've done a lot of coding over the years, however I am currently working on my 2nd ever perl script.

What I am doing is building a custom Cacti graph which gets it's data from my perl script. When I run my script at the command line it works fine, however when it is called from cacti it graphs the result as 0.

I have narrowed the issue down to an SSH call in the script that looks like the below:



if I use the commented line everything works fine in Cacti and I get my nice shiny graph. If I use the SSH command line it works fine from the command line, but does not work when Cacti calls the script. I am completely at a loss as to what is wrong, and I'm not overly sure if it's my lack of knowledge in perl, or lack of knowledge in Cacti that's causing me problems.

I thought it may have been a permissions issue on the script, but I have tried 0644, 0755 and 0777 and all of them give me a 0 result in the graph.

Any help is much appreciated.

I'd obviously spent too long looking at this last night, when I looked with fresh eyes this morning I found the problem pretty easily.

The problem was with the SSH key being used, or more accurately I forgot that the script would be called by the www-data user when cacti ran, and as root when I ran it in the command line. I su'd to www-data and found the issue, generated a new key pair for that user and BAM, nice shiny stats in Cacti.