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Message from discussion Ganeti Structure
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Patrick Hahn  
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 More options Aug 31 2012, 1:12 pm
From: Patrick Hahn <ph...@janestreet.com>
Date: Fri, 31 Aug 2012 13:12:42 -0400
Local: Fri, Aug 31 2012 1:12 pm
Subject: Re: Ganeti Structure
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A node can only belong to one cluster at a time. However this is fine since
the primary and secondary nodes are set on the per-instance (i.e. guest)
level. You would do something like (on node1)

gnt-cluster init cluster1.domain.com
gnt-node add node2.domain.com
gnt-instance add -t drbd --node=node1.domain.com:node2.domain.com
guest1.domain.com
gnt-instance add -t drbd --node=node2.domain.com:node1.domain.com
guest2.domain.com

And that should do what you're describing (assuming I understood properly).

Thanks,
Patrick

On Fri, Aug 31, 2012 at 8:51 AM, j b <jwbens...@gmail.com> wrote:
> Howdy all,

> I am playing around with Ganeti and I would like to clarify the structure
> of Ganeti and it's terminology, to ensure I can use it as I wish,
> or change my design if I am mistaken.

> Imagine two physical nodes (node1 & node2) and two different virtual
> machines (guest1 & guest2). If I have understood the Ganeti docs correctly,
> I would like to set up two clusters (cluster1 & cluster2).

> Cluster1 has two nodes (node1 & node2) and I would like to then set up an
> instance of guest1 on this cluster so that it runs on node1 as the primary
> node1, and would spin up on node2 if node1 failed.

> I would like cluster2 to also consist of two nodes (the same node1 &
> node2) and on here bring up an instance of guest2 where node2 is the
> primary node, and in a failure of node2 guest2 would spin up on node1. So
> these two physical servers are failing over to each other.

> Can Ganeti run more than one cluster on the same node1? Or have I
> miss-understood and under one cluster comprising of these two nodes I can
> run two different instances and have different primary nodes per instance?

> Many thanks for your time all.

> P.s. Loving Ganeti so far, I hope it can do what I require as it seems
> very powerful!


 
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