[rabbitmq-discuss] Moving from 2node to 3node cluster?

Mon Jun 9 10:37:35 BST 2014

On 06/09/2014 11:11 AM, Simon MacMullen wrote:
 > You don't need to do that.
>
> I assume by "config" you're referring to
> http://www.rabbitmq.com/clustering.html#auto-config.
>
> But the docs there say:
>
>> Note that the cluster configuration is applied only to fresh nodes. A
>> fresh nodes is a node which has just been reset or is being start for
>> the first time. Thus, the automatic clustering won't take place after
>> restarts of nodes. This means that any change to the clustering via
>> rabbitmqctl will take precedence over the automatic clustering
>> configuration.
>
> So neither of the existing nodes need to be reconfigured. You just need
> to tell the third node to join the cluster, either with the config file
> (on the third node!) as mentioned above, or with 'rabbitmqctl
> join_cluster'. No downtime needed.

Thank you I will try it, and report back!