Mats Gustavsson <wwwmaz...@gmail.com> wrote:
> I have a Perl script that creates a .png file with the graph. So far so good.
> In the Graph I have the function "HRULE:22#000000" that works just fine.
>
> Now I want to make the value 22 flexible. I want it be be read from a
> external file.
> So when I just change the value to 21, or 23 or what ever, its been read from
> a file.
>
> Because the value in the file ex 22 is being read from multiple scripts, both
> a bash and a python script, I want it to pick the value from the file to the
> HRULE in the RRDs::Graph, in the perl Script.
>
> The file, that is today being read from bash and python, is just containing a
> value between -30 to +50. So the help that I need with, it needs to handle a
> value ex -5 and 22.
>
> The reason I want it to read from the same file, is that I just needs to
> adjust in two files.
> File 1 High value like -5
> File 2 Low value like 22.
> Instead in 20-24 different places, that is easily to miss a place to change.
>
> I hope that some one can help me.
TBH I'm not sure what the question is ! It seems that you've already figured
out that the way to do this is to put the values into files, and read those
files in to set a variable that you can then use in building the RRD command.
In bash I'd be thinking along the lines of :
MaxLineValFile="/some/path/to/file"
read $MaxlineVal < ${MaxLineValFile}
# Apply some sanity checking here !
rrdtool ... ${MaxLineVal} ...
I actually use rrdcgi in my scripts (cgi scripts served up by Apache), like
this :
(
echo some stuff
echo more stuff
some conditional stuff
...
) | /usr/bin/rrdcgi --filter - 2>&1 > /dev/null
This is because some of my RRD stuff is quite large - biggest is 254 values
stacked, plus another 254 valued inverted and stacked, plus a legend for min
and average for each. I did try building up the list of RRD commands in a text
variable and then calling "rrdtool graph ${command_list}" but it got really
slow building that up.
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