[rrd-users] Assign RRDGraph DEF variables to external variable?

[Md. Ali Ahsan Rana]

Hello Steve,
Thanks a lot! Yes, this trick is working just fine.

Regards
Rana



On Sun, Jun 22, 2014 at 1:02 AM, Steve Shipway <s.shipway at auckland.ac.nz>
wrote:

>  There are a couple of issues here.
>
> Firstly, you are misunderstanding the use of MAX in a DEF.  What this
> means is that you will get the MAX-type RRA, which holds the maximum value
> over the consolodated interval as a series -- what I think you want is the
> maximum value over the entire series?  In this case, you need to use a VDEF.
>
> Secondly, the LINE2 directive will print out the legend line, if you have
> a description, but without a newline.  So, you can easily append to it with
> a subsequent directive.  So, for example:
>
> "DEF:test:test.rrd:sum:AVERAGE"
> "VDEF:testmax:test,MAXIMUM"
> "LINE2:test#00FF00:Test Graph, Max value="
> "GPRINT:testmax:%6.2lf"
> "COMMENT:\\l"
>
> The COMMENT directive is to force a left-justified newline after printing
> the legend and the maximum value.
>
>
> Steve
>
>  *Steve Shipway*
> University of Auckland ITS
> *UNIX Systems Design Lead*
> s.shipway at auckland.ac.nz
> Ph: +64 9 373 7599 ext 86487
>
>   ------------------------------
> *From:* Md. Ali Ahsan Rana [aliahsanrana at gmail.com]
> *Sent:* Sunday, 22 June 2014 12:27 p.m.
> *To:* Steve Shipway; linux at thehobsons.co.uk
> *Cc:* rrd-users at lists.oetiker.ch
> *Subject:* Re: [rrd-users] Assign RRDGraph DEF variables to external
> variable?
>
>   Thanks Steve and Simon for your reply. I get the idea, thanks. However,
> my current need is little simpler one. I want the value to be shown as part
> of the title, such as:
>
>  $series = "DEF:'test'='$rrd_dir/test.rrd':'sum':AVERAGE "
>>
>                  . "DEF:'max'='$rrd_dir/test.rrd':'sum':MAX "
>
>>               ."LINE2:test#00FF00:'Test Graph, Max Value={max} '  "
>
>
>  As you can see, I want to print the max value of the same data set as
> part of title. I guess its achievable without calling rrdgraph twice? Can
> you please give a clue how? Thanks.
>
>  Regards
> Rana
>
>
>
>
>
> On Sat, Jun 21, 2014 at 6:17 PM, Steve Shipway <s.shipway at auckland.ac.nz>
> wrote:
>
>>  If you wish to access the RRDTool data programmatically from PHP, then
>> you have two options.
>>
>> If you just want a few set values, you could call rrdtool using the PRINT
>> directive to output text on stdout, and capture that, though you then have
>> to parse the captured text.
>>
>> If you want to access the entire data series, then you could call
>> 'rrdtool fetch' or 'rrdtool xport' to obtain the data; also, you could
>> install the PHP RRDtool library, and then access it directly from the PHP
>> code rather than having to fork off a separate process and catch the
>> output.  This might be the most efficient way to achieve what you want.
>>
>> Steve
>>
>>  *Steve Shipway*
>> University of Auckland ITS
>> *UNIX Systems Design Lead*
>> s.shipway at auckland.ac.nz
>> Ph: +64 9 373 7599 ext 86487
>>
>>   ------------------------------
>> *From:* rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch
>> [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf
>> of Md. Ali Ahsan Rana [aliahsanrana at gmail.com]
>> *Sent:* Saturday, 21 June 2014 4:28 p.m.
>> *To:* rrd-users at lists.oetiker.ch
>> *Subject:* [rrd-users] Assign RRDGraph DEF variables to external
>> variable?
>>
>>    Hello EveryOne,
>>
>>  I am constructing and executing rrdgraph command from php. A sample is
>> as follows:
>>
>>   $series = "DEF:'test'='$rrd_dir/test.rrd':'sum':AVERAGE "
>>>              ."LINE2:test#00FF00:'Test Graph' "
>>
>>
>>  Now, I want the rrd variable 'test' to be assigned to an external php
>> variable so that I can use that value for other task. How I can achieve
>> this please?
>>
>>  Regards
>> Rana
>>
>
>
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