[ClusterLabs] Minimum configuration for dynamically adding a node to a cluster

Ken Gaillot kgaillot at redhat.com
Wed Jun 8 10:21:08 EDT 2016

On 06/08/2016 06:54 AM, Jehan-Guillaume de Rorthais wrote:
> Le 8 juin 2016 13:36:03 GMT+02:00, Nikhil Utane <nikhil.subscribed at gmail.com> a écrit :
>> Hi,
>> Would like to know the best and easiest way to add a new node to an
>> already
>> running cluster.
>> Our limitation:
>> 1) pcsd cannot be used since (as per my understanding) it communicates
>> over
>> ssh which is prevented.
> As far as i remember,  pcsd deamons use their own tcp port (not the ssh one) and communicate with each others using http queries (over ssl i suppose).

Correct, pcsd uses port 2224. It encrypts all traffic. If you can get
that allowed through your firewall between cluster nodes, that will be
the easiest way.

corosync.conf does need to be kept the same on all nodes, and corosync
needs to be reloaded after any changes. pcs will handle this
automatically when adding/removing nodes. Alternatively, it is possible
to use corosync.conf with multicast, without explicitly listing
individual nodes.

> As far as i understand, crmsh uses ssh, not pcsd.

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