[rrd-users] Generate rrd graph in real time

David Thornton northdot9 at gmail.com
Thu Jun 25 05:49:40 CEST 2009

you want rrdcgi

it's great I love it.

it's a cgi script that does exactly what you want (I think)



On Wed, Jun 24, 2009 at 12:17 PM, William R. Lorenz<wrl at express.org> wrote:
> Hello,
> On Wed, 24 Jun 2009, Robert Hagens wrote:
>> I couldn't get php-rrdtool to work, it seems that support has stopped
>> for it. I could be wrong. I do all my work in php, and fire up rrdtool
>> as a separate process, and pipe commands to/from it from php.
>> frankie wrote:
>>>> Hi all, I want to generate the graph realtime when the web page is
>>>> visited by someone similar to cacti . Is php-rrdtool is the only way
>>>> to do it?
>>> No. I do it at work with a bash script and rrdtool, but I suspect php
>>> or perl would be better as the bash script is not pretty !  See
>>> https://lists.oetiker.ch/pipermail/rrd-users/2009-January/015167.html
> It is also possible to reference a PHP script for an image, i.e.:
>   <img src="/rrd-image-script.php" />
> In the top of that PHP script, you will need to add the following, BEFORE
> ANYTHING ELSE, to specify the document is a binary-encoded PNG image:
>   <?php
>   header("Content-Type: image/png\n");
>   header("Content-Transfer-Encoding: binary");
>   ?>
> At that point, you can just call out to rrdtool to get the image data,
> using something akin to <?=system("rrdtool graph - OPTIONS")?> (of course,
> please the OPTIONS with your options).  The '-' prints to stdout, and thus
> returns the image data via the system call to the page for its transfer.
> This is, in my opinion, the easiest method to produce dynamic PHP graphs.
> You can also call out to /rrd-image-script.php?name=mygraph&param1=val1 or
> specify other variables that should be passed in on the HTTP GET string,
> which will allow you to generate more than one graph from the same script.
> Hope this helps,
> --
> William R. Lorenz
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