[rabbitmq-discuss] Clustering question

Tue May 11 16:28:59 BST 2010

Hi Matt,

On Tue, May 11, 2010 at 11:20:12AM -0400, Matt Calder wrote:
> I am following along the clustering guide and not getting expected
> results. I have two machines running rabbitmq, and they can
> communicate (each can send messages to the other). So as per the
> clustering guide I run:
> 
> ubuntu at domU-2:~/tmp$ sudo rabbitmqctl stop_app
> Stopping node 'rabbit at domU-2 ...
> ...done.
> ubuntu at domU-2:~/tmp$ sudo rabbitmqctl reset
> Resetting node 'rabbit at domU-2' ...
> ...done.
> ubuntu at domU-2:~/tmp$ sudo rabbitmqctl cluster rabbit at domU-1
> Clustering node 'rabbit at domU-2' with ['rabbit at domU-1'] ...
> ...done.
> ubuntu at domU-2:~/tmp$ sudo rabbitmqctl status
> Status of node 'rabbit at domU-2' ...
> [{running_applications,[{sasl,"SASL  CXC 138 11","2.1.6"},
>                         {stdlib,"ERTS  CXC 138 10","1.16.2"},
>                         {kernel,"ERTS  CXC 138 10","2.13.2"}]},
>  {nodes,['rabbit at domU-2']},
>  {running_nodes,[]}]
> ...done.
> 
> So despite the fact that it appeared to run, you can see that there
> are no running nodes.

The crucial step you're missing is to restart rabbit:

ubuntu at domU-2:~/tmp$ sudo rabbitmqctl start_app

> On the other machine:
> 
> ubuntu at domU-1:~/tmp$ sudo rabbitmqctl status
> Status of node 'rabbit at domU-1' ...
> [{running_applications,[{rabbit,"RabbitMQ","1.6.0"},
>                         {mnesia,"MNESIA  CXC 138 12","4.4.10"},
>                         {os_mon,"CPO  CXC 138 46","2.2.2"},
>                         {sasl,"SASL  CXC 138 11","2.1.6"},
>                         {stdlib,"ERTS  CXC 138 10","1.16.2"},
>                         {kernel,"ERTS  CXC 138 10","2.13.2"}]},
>  {nodes,['rabbit at domU1','rabbit at domU-2']},
>  {running_nodes,['rabbit at domU-1']}]
> ...done.

domU-1 knows of the existence of domU-2 now (hence it being listed in
nodes), but as you've not started it up again, it's not running.

Matthew