[rrd-users] Re: error RRDS:Graph failed to write file Permission denied

[Serge Maandag]

> But the perl script returns (in a label included in the graph) : graph
> failed (Opening '/home/vials/img.png' for write : Permission denied).

Just a guess, your cgi is running as user apache. user apache is in 
group apache. Your homedir is owned by user "vials" with group "vials".

Use the chgrp command to set the dir as owned by the group apache.
Set the directory as writable by anyone in the group (chmod g+rxw vials)

Serge.

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