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



Hi Digi,

1. sniplet of cluster.conf file from one cluster  :-

<?xml version="1.0"?>
<cluster alias="Cluster" config_version="1" name="Cluster">
  <clusternodes>
    <clusternode name="blade4-2" nodeid="2" votes="1">
      <fence>
        <method name="1">
          <device blade="2" missing_as_off="1" name="BladeCenterFencing"/>
        </method>
      </fence>
    </clusternode>
    <clusternode name="blade4-1" nodeid="1" votes="1">
      <fence>
        <method name="1">
          <device blade="1" missing_as_off="1" name="BladeCenterFencing"/>
        </method>
      </fence>
    </clusternode>
  </clusternodes>
  <cman expected_votes="1" two_node="1"/>
  <fencedevices>
    <fencedevice agent="fence_bladecenter" ipaddr="XXXXX" login="USERID" name="BladeCenterFencing" passwd="******"/>
  </fencedevices>

...

Of another cluster is same except node names differ(they blade3-1 and blade3-2).

2.

In /etc/hosts

192.168.154.1/24 blade4-1.privdomain blade4-1 (this goes on eth1 of blade4-1)
192.168.154.2/24 blade4-2.privdomain blade4-2 (this goes on eth1 of blade4-2)

Same is with blade3-1 and blade3-2 (Cluster 2)

192.168.153.1/24 blade3-1.privdomain blade3-1 (this goes on eth1 of blade3-1)
192.168.153.2/24 blade3-2.privdomain blade3-2 (this goes on eth1 of blade3-2)

3. Public IP of blade4-1 & blade4-2 (Cluster 1) and blade3-1 & blade3-2 (Cluster 2) are on same subnet 10.5.81.xxx and subnet mask is 255.255.255.

Thanks

On Wed, Mar 28, 2012 at 12:54 PM, Digimer <lists alteeve ca> wrote:
I'll admit to having trouble following you... So let's get some basics;

* What is the cluster.conf of either cluster?
* What exact IPs does the hostnames, as set in the cluster.conf, resolve to?
* What is the exact IP of eth0 and eth1 on each node, inc. netmask?

As a point of curiosity; why do you need the cluster names to be identical?

Digi

On 03/28/2012 12:00 AM, Parvez Shaikh wrote:
> 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 redhat com
> <mailto:fdinitto 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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--
Digimer
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