[rabbitmq-discuss] Unable to get automatic clustering to work

Thu Jan 13 13:12:23 GMT 2011

> I'm running 1.7.2 (because that's what's in the repos for Ubuntu
> 10.04) 

That really is ancient and you should upgrade.

> and trying to bring up clusters via automated configuration
> management, but the nodes are not clustering; they just come up
> standalone.

At some point (2.0, I think), we changed the way automatic clustering
works.  We now read the settings from rabbitmq.config.  Before, we had a
separate rabbitmq_cluster.config file.

If I remember correctly, put [ 'rabbit at rabbit2', 'rabbit at rabbit1' ]
in /etc/rabbitmq/rabbitmq_cluster.config.

Cheers,
Alex

On Thu, Jan 13, 2011 at 07:48:35AM -0500, Mark J. Reed wrote:
> I'm running 1.7.2 (because that's what's in the repos for Ubuntu
> 10.04) and trying to bring up clusters via automated configuration
> management, but the nodes are not clustering; they just come up
> standalone.
> 
> I've read and followed
> http://www.rabbitmq.com/clustering.html#auto-config, and it's just not
> working for me. I found
> http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2010-November/010104.html,
> but didn't see a solution, just a "never mind, it's working now"...
> 
> If I manually cluster the nodes, it works fine, so I know that basic
> functionality and connectivity between the nodes is there.
> 
> I know my rabbitmq.config file is in the right place because I can
> change it and see the impact when I restart.
> 
> For a simple test, I have two hosts.  I give them both the same
> rabbitmq.config file, with nothing in it but this:
> 
> [{rabbit, [ {cluster_nodes, [ 'rabbit at rabbit2', 'rabbit at rabbit1' ]} ] } ].
> 
> (I've tried both bare node names and FQDNs, BTW.  FQDNs don't work
> with the cluster command, either.).
> 
> On each host, I perform these steps:
> 
> $ sudo rabbitmqctl stop_app
> $ sudo rabbitmqctl reset
> $ sudo rabbitmqctl stop
> $ sudo /etc/init.d/rabbitmqctl-server start
> 
> But when I check the status, no clustering:
> 
> rabbit1$ sudo rabbitmqctl status
> Status of node rabbit at rabbit1 ...
> [{running_applications,[{rabbit,"RabbitMQ","1.7.2"},
>                         {mnesia,"MNESIA  CXC 138 12","4.4.12"},
>                         {os_mon,"CPO  CXC 138 46","2.2.4"},
>                         {sasl,"SASL  CXC 138 11","2.1.8"},
>                         {stdlib,"ERTS  CXC 138 10","1.16.4"},
>                         {kernel,"ERTS  CXC 138 10","2.13.4"}]},
>  {nodes,[rabbit at rabbit1]},
>  {running_nodes,[rabbit at rabbit1]}]
> ...done.
> 
> As I said, it works fine if I use the cluster command:
> 
> rabbit1$ sudo rabbitmqctl stop_app
> rabbit1$ sudo rabbitmqctl reset
> rabbit1$ sudo rabbitmqctl cluster rabbit at rabbit2
> rabbit1$ sudo rabbitmqctl start_app
> rabbit1$ sudo rabbitmqctl status
> Status of node rabbit at rabbit1 ...
> [{running_applications,[{rabbit,"RabbitMQ","1.7.2"},
>                         {mnesia,"MNESIA  CXC 138 12","4.4.12"},
>                         {os_mon,"CPO  CXC 138 46","2.2.4"},
>                         {sasl,"SASL  CXC 138 11","2.1.8"},
>                         {stdlib,"ERTS  CXC 138 10","1.16.4"},
>                         {kernel,"ERTS  CXC 138 10","2.13.4"}]},
>  {nodes,[rabbit at rabbit1,rabbit at rabbit2]},
>  {running_nodes,[rabbit at rabbit2,rabbit at rabbit1]}]
> ...done.
> 
> So what are my next steps in troubleshooting this?
> 
> 
> -- 
> Mark J. Reed <markjreed at gmail.com>
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