Lawrence,
Every node that you want to monitor should have gmond (Ganglia monitor
daemon) running. gmond should be started with a config file named
gmond.conf. gmond expects /etc/gmond.conf if you don't pass it in with
the --conf flag.
The gmetad (Ganglia meta daemon) will collect data from one gmond node
specified using the data_source keyword. This node should have
information about all the gmond nodes, this is normally accomplished
through using multicast. In your configuration, you will run gmetad on
the master node. The webserver will get its information from gmetad and
will display charts from the rrd files that the gmetad writes. Most
likely you will run the webserver on the master node so you will want to
have the localhost as a trusted_host in the gmetad.conf.
Three notes:
1. You can specify multiple nodes in the data_source, but gmetad will
only use one at a time, this is for fail over. You should have only one
data_source line per cluster.
2. You can test that the node you specified in your data_source knows
about the other nodes by running this command `nc node.fake.net 8649 |
grep 'HOST NAME='
3. If multicast is not working for you consider using unicast.
Good Luck,
Ian
[EMAIL PROTECTED] wrote:
Hi:
I have a small cluster of I master node and 3 worker nodes.
I have successfully installed ganglia (gmetad and gmond) on the master
node.
Now I want the worker nodes to report in addition to the master nodes.
I want all this reporting to happen at a common URL.
On the worker nodes, do I have to install gmond WITHOUT gmetad on the
worker nodes, using the trusted_host and data_source keywords in
/etc/gmetad.conf file to aggregate the reporting?
Thanks.
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