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Date: Fri, 31 Aug 2012 19:29:47 +0200
From: Iustin Pop <iu...@k1024.org>
To: ganeti@googlegroups.com
Subject: Re: Ganeti Structure
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On Fri, Aug 31, 2012 at 05:51:15AM -0700, j b 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).

No, not really. Each node can be in only one cluster at any point in
time.

> 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?

Yes, indeed, you only need one cluster. The "primary" setting is a
per-instance one, not a per-cluster.

thanks,
iustin