Igor Rosenberg <[EMAIL PROTECTED]> wrote: > gmond and gmetad behave properly when called through telnet (they > show the DTD), but without showing any metrics!! The <CLUSTER> Tag > contains nothing at all!! I'm very puzzled, as I have made no > changes to the packages downloaded... I can only think it is related > to some network configuration, blocking in some way the emission of > the metrics when the daemon wants to inform the rest of the > world. But does the daemon need the network to communicate with > itself? What exactly is the IP specified in the gmond.conf
Coincidentally, I had this very same question on this very same list just a couple of weeks ago, and the answer is yes: gmond does need to use the network to communicate with itself. The part of gmond that collects and reports metrics about its own host, and the part of gmond that collects all of the metrics for its cluster and reports them on port 8649, don't talk to each other directly. To the second part of gmond (the 8649 part), the "local" portion is just another gmond that happens to be multicasting on the local network, like all other gmonds. I think this is very unintuitive, and I expect everyone who is new to Ganglia to assume that each gmond would at least report its own host's metrics, regardless of the network. It's not a problem per-se that it doesn't but it's definitely a huge deficiency in the documentation that it does not make this clear when you're first setting things up. People are often going to be tempted to "test" one gmond before trying to configure multicasting and related network stuff and test a cluster. -- Cos ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
