Cacti Bug - Duplicating Data Sources

[Jayhoo]

I have been using Cacti pretty extensively lately, but I have found something that Cacti does (maybe on purpose) very annoying.

I have a data template created that contains 3 items: BIO, CPU, MEM.

When creating a new data source Cacti does as it should:

/usr/bin/rrdtool create \
<rrd path>
--step 300 \
DS:BIO:GAUGE:600:0:1000 \
DS:CPU:GAUGE:600:0:100 \
DS:MEM:GAUGE:600:0:100 \
<avg and max stuff>

*Note how the DS's are in order

but! when you save this item, then duplicate it, Cacti likes to put the "Data Source Item Fields" in some random order.

e.g.
...
DS:MEM:GAUGE:600:0:100 \
DS:CPU:GAUGE:600:0:100 \
DS:BIO:GAUGE:600:0:1000 \
...

But it MATTERS that the order is the same as the one I am copying since I am doing my graph updates using actual
"rrdupdate" scripts which assume the order is alphabetical.

i.e.
rrdupdate <rrd filename>
epochtime:BIO:CPU:MEM


So, is this a bug, or is Cacti trying to randomize this for some reason? It would be nice to have the option to preserve the ordering.

current fix:
copying many times and waiting until I get the right order, and delete the bad ones.

~Jayhoo

[TheWitness]

I will send to the author of Cacti for a response.

TheWitness

[raX]

The lack of ordering is definitely not intentional, just me forgetting to add an 'order by' clause to an SQL query. Try applying the attached patch to see if it helps. It orders the data sources in alphabetical order when generating the rrdcreate statement.

To apply this patch, download it to your Cacti directory and do:

Code: Select all

patch -p1 < data_source_item_order.patch

-Ian