[ClusterLabs] Adding a node to the cluster deployed with "Unicast configuration"

[Ken Gaillot]

On 02/22/2017 09:55 AM, Jan Friesse wrote:
> Alejandro Comisario napsal(a):
>> Hi everyone, i have a problem when scaling a corosync/pacemaker
>> cluster deployed using unicast.
>>
>> eg on corosync.conf.
>>
>> nodelist {
>> node {
>> ring0_addr: 10.10.0.10
>> nodeid: 1
>> }
>> node {
>> ring0_addr: 10.10.0.11
>> nodeid: 2
>> }
>> }
>>
>> Tried to add the new node with the new config (meaning, adding the new
>> node) nad leaving the other two with the same config and started
>> services on the third node, but doesnt seem to work until i update the
>> config on the server #1 and #2 and restart corosync/pacemaker which
>> does the obvious of bringing every resource down.
>>
>> There should be a way to "hot add" a new node to the cluster, but i
>> dont seem to find one.
>> what is the best way to add a node without bothering the rest ? or
>> better said, what is the right way to do it ?
> 
> Adding node is possible with following process:
> - Add node to config file on both existing nodes
> - Exec corosync-cfgtool -R (it's enough to exec only on one of nodes)
> - Make sure 3rd (new) node has same config as two existing nodes
> - Start corosync/pcmk on new node
> 
> This is (more or less) how pcs works. No stopping of corosync is needed.
> 
> Regards,
>   Honza

Ah, noted ... I need to update some upstream docs :-)

>>
>> PS: i can't implement multicast on my network.
>>