On Fri, Aug 22, 2008 at 05:27:14PM -0400, Cassandra Pugh wrote:
> 
>    We have had ganglia gmetad set up on a server, which we would like to
>    retire.
> 
>    I am trying to bring up a new system, to use for the gmetad function,
>    however, I have run into a wall...

if you are migrating gmetad from one server to another, you most likely need
to migrate the gmetad and web frontend functions but also copy (`rsync -a`
them over when gmetad is not running if you are using the same username/uid
for gmetad in both servers) the rrd or you will lose all your historic data.

>    I set up the gmetad.conf on the new server, and also changed the
>    gmond.conf on the node systems to reflect the change in the
> 
>    channel to send multicast on mcast_channel:mcast_port, and restarted the
>    gmond process.

there should be no need to change the multicast channel in the nodes for
moving gmetad, but you will need to have your collector (usually a gmond
running in the gmetad server) listening in the same multicast channel.

>    however when I bring up the webfront I only see the server in which gmetad
>    is running....

at least that means gmetad can reach some gmond (the one locally which is
usually part of the default configuration)

>    When I check my /var/log/messages I see this message repeated many times.
> 
>    /usr/sbin/gmetad: data_thread() got no answer from any [Cluster]
>    datasource

that means that the gmond collector for "Cluster" is not running.

>    Does anyone have any idea what I am missing, or how I can get an answer
>    from the data source??

you haven't provided enough information to be able to come out with a
definitive answer, but hopefully the comments above will help you get to the
right setup.

Carlo

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