[Linux-cluster] Two clusters in the network with same "name" in cluster.conf

[Parvez Shaikh]

Thanks Fabio & Digimer,

Just to add more information that each node has 4 NIC cards out of which -

eth0 is public / management IP their addresses are falling on the same
subnet

eth1 is private address and they are privately connected (node A - node B)
and (node C - node D)

Cluster.conf mentions hostname(from /etc/hosts) which corresponds to IP
addresses of eth1 (not globally accessible name of eth0's IP)

Even in situation such as above, cluster names should be unique? I would
assume that ccsd would use only the node names given in cluster.conf for
communication.

Does ccsd use cluster name to locate other members of cluster and get copy
of cluster configuration file from those?

Following messages are seen in /var/log/messages -

Mar 28 11:57:07 blade4-2 ccsd[6821]: Starting ccsd 2.0.115:
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Built: Mar 16 2010 10:28:57
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Copyright (C) Red Hat, Inc.  2004
All rights reserved.
Mar 28 11:57:07 blade4-2 ccsd[6821]: cluster.conf (cluster name = Cluster,
version = 1) found.
Mar 28 11:57:07 blade4-2 ccsd[6821]: Remote copy of cluster.conf is from
quorate node.
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Local version # : 1
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Remote version #: 1
Mar 28 11:57:07 blade4-2 ccsd[6821]: Remote copy of cluster.conf is from
quorate node.
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Local version # : 1
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Remote version #: 1
Mar 28 11:57:07 blade4-2 ccsd[6821]: Remote copy of cluster.conf is from
quorate node.
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Local version # : 1
Mar 28 11:57:07 blade4-2 ccsd[6821]:  Remote version #: 1


On Wed, Mar 28, 2012 at 12:13 PM, Fabio M. Di Nitto <fdinitto at redhat.com>wrote:

> On 3/28/2012 8:14 AM, Parvez Shaikh wrote:
> > Hi experts,
> >
> > I am running in to a problem in a situation where two clusters in the
> > network have same name.
> >
> > Node A, Node B : cluster name CLUSTER
> > Node C, Node D : cluster name CLUSTER
> >
> > Node C and Node D's cluster is running fine however when I start node A
> > it copies /etc/cluster.conf (I believe ccsd) from either C and D and
> > replaces its own and start attempting a cluster, of course it fails
> > because C or D is not a host name of node A.
> >
> > Is it possible to have more than one clusters in same network, these
> > nodes are in IBM blades hosted in Bladecenter and the heart beat IPs are
> > on private network.
>
> Uh.. you can have multiple clusters on the same network as long as they
> have different names. Or you need to isolate them on different networks
> if you need to keep the same name.
>
> Fabio
>
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