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Re: [Linux-cluster] having problems trying to setup a two node cluster



vahram wrote:
Hi all,

I'm trying to set up a little two node demo cluster, but I'm having some weird issues.

Here's my cluster.conf:

<?xml version="1.0"?>
<cluster name="demo" config_version="1">

  <cman two_node="1" expected_votes="1">
  </cman>

  <nodes>
    <node name="nodeA" votes="1">
      <fence>
        <method name="single">
          <device name="human" ipaddr="192.168.2.203"/>
        </method>
      </fence>
    </node>
    <node name="nodeB" votes="1">
      <fence>
        <method name="single">
          <device name="human" ipaddr="192.168.2.204"/>
        </method>
      </fence>
    </node>
  </nodes>

  <fence_devices>
    <device name="human" agent="fence_manual"/>
  </fence_devices>

</cluster>

I have both nodeA and nodeB defined in /etc/hosts on both boxes, and I launched ccsd on both machines. All the necessary modules are also loaded.

When I run ccs_test connect, I get a connection refused message. I then tried to run cman_tool join on both boxes. nodeB successfully receives a copy of cluster.conf, but it then tries to form it's own cluster. In other words...nodeA sees this:

[root nodeA ~]# cat /proc/cluster/status
Version: 3.0.1
Config version: 1
Cluster name: demo
Cluster ID: 40925
Membership state: Cluster-Member
Nodes: 1
Expected_votes: 1
Total_votes: 1
Quorum: 1
Active subsystems: 0
Node addresses: 192.168.2.203
[root nodeA ~]# cat /proc/cluster/nodes
Node  Votes Exp Sts  Name
   1    1    1   M   nodeA

and nodeB sees this:

[root nodeB ~]# cat /proc/cluster/status
Version: 3.0.1
Config version: 1
Cluster name: demo
Cluster ID: 40925
Membership state: Cluster-Member
Nodes: 1
Expected_votes: 1
Total_votes: 1
Quorum: 1
Active subsystems: 0
Node addresses: 192.168.2.204
[root nodeB ~]# cat /proc/cluster/nodes
Node  Votes Exp Sts  Name
   1    1    1   M   nodeB

Both boxes are running FC3, and I used the SRPM's from http://people.redhat.com/cfeist/cluster/SRPMS/

Please let me know what I'm doing wrong here...thanks!

I had a similar issue. The problem was with the multicast routing. I was using two NICs on each node...one public (eth0) and one private (eth1), with the default gateway going out eth0.

The route for the multicast (224.x.x.x) was going out the default
gateway and not reaching the other machine.  By putting in a fixed route
in for multicast:

route add -net 224.0.0.0/8 dev eth1

it all started working.  This was my fix, it may not work for you.
Also, I use the CVS code from http://sources.redhat.com/cluster and
not the source RPMs from where you specified.
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- Rick Stevens, Senior Systems Engineer     rstevens vitalstream com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-     Veni, Vidi, VISA:  I came, I saw, I did a little shopping.     -
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