[collectd] First time user of collectd 4.2.1: Issue with exec pluggin

[Sebastian Harl]

Hi Jean-Francois,

On Mon, Nov 12, 2007 at 10:13:16AM -0500, jeff nad wrote:
> Im not sure to understand correctly how collectd works.  If I leave all 
> output pluggins disabled in client mode, could a remote server node do all 
> the rrd work ?

Well, kind of - the network plugin is considered to be an output plugin as
well and you'd have to enable it on all nodes that are supposed to send data
to a remote system. You can find detailed documentation about collectd's
network setup (including required plugins on each side) at [1], so I'm not
going to repeat any of that.

> We have around 800 nodes and I question myself about the best model to 
> gather metrics and generate rrd in the a scalable way.   Having each server 
> generate its own rrds locally is interesting, but I would have to rsync that 
> to a central location afterward.   What do you recommend ?

I'd recommend using a multicast group for that and make all nodes send the
data to the central server using the network plugin (see [1] again). If you
then enable the rrdtool plugin on the server it will write the RRD files for
all client nodes. As you're talking about a pretty high number of clients you
probably want to play around with the CacheFlush and CacheTimeout options of
the rrdtool plugin (on the server side) - see collectd.conf(5) for details.

HTH,
Sebastian

[1] http://collectd.org/documentation/networking.shtml

-- 
Sebastian "tokkee" Harl +++ GnuPG-ID: 0x8501C7FC +++ http://tokkee.org/

Those who would give up Essential Liberty to purchase a little Temporary
Safety, deserve neither Liberty nor Safety.         -- Benjamin Franklin

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