Graphing existing RRD files with Cacti

[samwsm]

Hi

So i created a dummy rrd, populated it with some dummy values.

If i use

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rrdtool graph

I can get the graph of the data i entered without any problem.

But it seems to me that i can only gather/graph data from a host

My question is: Is it possible to graph non SNMP data in Cacti? How would i do this simple graphing with Cacti?

Thank you for your time answering this newbie question

sAm

[gandalf]

Yes, please see http://docs.cacti.net/manual:087:3a_adv ... ced_topics
R.

[samwsm]

Thank you for your reply, it was helpful.

I would still like to know, in Data Input Methods -> Output Fields, is it possible to have time in the output fields.
For example:

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Time:Data
1226451240:46
1226451840:48
1226452440:44

where Time is assigned to the data, instead of

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Time:1226451240 Data:46
Time:1226451840 Data:48
Time:1226452440 Data:44 

where both being stored as seperate Data Sources?[/code]

[gandalf]

It would be, in principle, possible to pass a field "time" to rrdtool. When doing so, only the second method is accepted.
But you want be happy with the result. Cacti is currently NOT able to accept a foreign timestamp. If there's a need to do so, you will have to do the rrd update on your own, providing your timestamp. Cacti will still be able to graph the data.
There's a howto that describes "externally updated data sources" at the 1st link of my sig
R.

[samwsm]

Thanks, that works, here is my final question:

when graphing, with debug mode on, i see

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RRDTool Command:

/usr/bin/rrdtool graph - \
--imgformat=PNG \
--start=-86400 \
--end=-600 \
...

is there a way to manually set the start and end time? instead of graphing from (now)-86400 to (now)-600

[gandalf]

Yes, there's a way: use the timeshifter. Switch to the GRAPHS mode and select any method of defining a start/end timestamp, either
- preset
- start/stop date/time by using the time picker
- shifting start/stop left or right
- define start/stop manually using the input fields
R.