[Linux-cluster] cannot add 3rd node to running cluster

Abraham Alawi a.alawi at auckland.ac.nz
Mon Jan 4 19:34:00 UTC 2010

On 1/01/2010, at 5:13 AM, Terry wrote:

> On Wed, Dec 30, 2009 at 10:13 AM, Terry <td3201 at gmail.com> wrote:
>> On Tue, Dec 29, 2009 at 5:20 PM, Jason W. <jwellband at gmail.com> wrote:
>>> On Tue, Dec 29, 2009 at 2:30 PM, Terry <td3201 at gmail.com> wrote:
>>>> Hello,
>>>> I have a working 2 node cluster that I am trying to add a third node
>>>> to.   I am trying to use Red Hat's conga (luci) to add the node in but
>>> If you have two node cluster with two_node=1 in cluster.conf - such as
>>> two nodes with no quorum device to break a tie - you'll need to bring
>>> the cluster down, change two_node to 0 on both nodes (and rev the
>>> cluster version at the top of cluster.conf), bring the cluster up and
>>> then add the third node.
>>> For troubleshooting any cluster issue, take a look at syslog
>>> (/var/log/messages by default). It can help to watch it on a
>>> centralized syslog server that all of your nodes forward logs to.
>>> --
>>> HTH, YMMV, HANW :)
>>> Jason
>>> The path to enlightenment is /usr/bin/enlightenment.
>> Thank you for the response.  /var/log/messages doesn't have any
>> errors.  It says cman started then says can't connect to cluster
>> infrastructure after a few seconds.  My cluster does not have the
>> two_node=1 config now.  Conga took that out for me.  That bit me last
>> night because I needed to put that back in.
> CMAN still will not start and gives no debug information.  Anyone know
> why cman_tool -d join would not print any output at all?
> Troubleshooting this is kind of a nightmare.  I verified that two_node
> is not in play.
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster

Try this line in your cluster.conf file:
<logging debug="on" logfile="/var/log/rhcs.log" to_file="yes"/>

Also, if you are sure your cluster.conf is correct then copy it manually to all the nodes and add clean_start="1" to the fence_daemon line in cluster.conf and run 'service cman start' simultaneously on all the nodes (probably a good idea to do that from runlevel 1 but make sure you have the network up first)


  -- Abraham

Abraham Alawi

Unix/Linux Systems Administrator
Science IT
University of Auckland
e: a.alawi at auckland.ac.nz
p: +64-9-373 7599, ext#: 87572


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