What I've been doing is running the gmond on all my cluster nodes, but
making all but 2 of my 160 nodes "deaf" (see gmond.conf). All the nodes
then multicast their information, but only two hold the data, the other
nodes just broadcast but don't hold any data.
This is *really* useful, because if one node dies or is moved, then you
don't have to restart gmond on every single node to get it to 'forget'
the node... you just need to do it on the two listening nodes. Also,
network traffic is significantly reduced.
Paul
Princeton Plasma Physics Lab
Johnston Michael J Contr AFRL/DES wrote:
Thanks for the response Bernard!
I guess I didn’t think that I could only put 1 node in the data_source
line because how does it know to go and collect the information from
the other nodes? Does it just scan the subnet looking for any machine
running gmond? Every one of my nodes has the exact same gmond.conf
file on it with the name of my cluster in it. Is that how it knows?
Thanks for asking about the graphs… Thanks to everyone’s pointers, I
learned that I had listed the path to the RRDtool directory, but
hadn’t put the executable name into the path. After I changed that it
all started working… ;) Ganglia is really awesome!
Mike
------------------------------------------------------------------------
*From:* Bernard Li [mailto:[EMAIL PROTECTED]
*Sent:* Friday, June 04, 2004 11:18 AM
*To:* Johnston Michael J Contr AFRL/DES;
[email protected]
*Subject:* RE: [Ganglia-general] All my nodes listed as clusters
If you only have one cluster, you only need one data_source (think of
the data_source as the headnode of your cluster, if you will).
So you just need one entry for data_source - you can put more than one
node in the data_source entry for redundancy purposes.
So I take it you can see your graph now and the previous thread you
posted is dead?
Cheers,
Bernard
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *On Behalf Of
*Johnston Michael J Contr AFRL/DES
*Sent:* Friday, June 04, 2004 8:37
*To:* [email protected]
*Subject:* [Ganglia-general] All my nodes listed as clusters
I have a silly question, as usual…
When I bring up the view of my cluster, it comes up as a Grid… so
it .looks like this:
Grid > MyCluster > Choose a Node
I’m guessing that’s because in my gmetad.conf file I have every
node in my cluster listed as:
data_source "N1" 60 192.168.3.2:8649
data_source "N2" 60 192.168.3.3:8649
I’m sure that I’m listing them wrong because Ganglia thinks that
each node is its own cluster. My question is how do I make them
appear like one unit as I see in the demo pages? Do I add them all
to one data_source line?
On a side question, is it normal for my head node to always be in
the red? It looks like it’s only using about 8% CPU, but it’s
always red or orange.
