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it's a a brand new install, and I forgot to mention that Debian is running in virtual machine on ESXi 6.0.
I modified a few of the existing templates, but this was the first graph I tried to make, in order to verify whether the poller (and the entire system) correctly operates.
I have tried to run the poller manually (as root) and this works for 1 minute (as configured), but it does not continue permanently, despite the cron job.
Apart from the error message reported in previous posting, I cannot find any indications of what is going wrong. I am also comparing with a previous test with Cacti 1.1.5 on Debian 8 which does run fine.
The modification of the templates are minor: I duplicated the original template, and modified the profile from the default system one to a new profile that defines 10s polling with the associated RRA definitions.
I created the graph via the usual way: select the device, then click on 'Create Graphs for this Device', then I select the Graph Template Name and click on 'Create'. Right after clicking 'Create' the error messages reported above appear in the /var/log/apache2/error.log.
Then I do have to select a 'Legend Color'. I select a 'cacti color', e.g. 005199, and click once more on 'Create'.
There is a popup saying that the graph is created.
Just to avoid any confusion: I did not modify any PHP code.
