Re: [rrd-users] Help with: Input from a file in the RRD Graph

[Simon Hobson]

Mats Gustavsson  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#00" 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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[rrd-users] Help with: Input from a file in the RRD Graph

[Mats Gustavsson]

Hi,
I am new to this, so I hope that I post this correctly.

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#00" 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.

Best Regards Mats
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