[rabbitmq-discuss] newbie problem--'Error: unable to connect to node 'rabbit at rabbitmq-small02-dev': nodedown'

Michael Cumings mcumings at narrativescience.com
Fri Mar 16 18:37:44 GMT 2012

So what is the considerations on having 5 over 10 or 1?  Is there a
reasonable criteria that can be used to determine what an appropriate
number of ports that should be allocated?

On Fri, Mar 16, 2012 at 12:56 PM, Emile Joubert <emile at rabbitmq.com> wrote:

> Hi John,
> I assume that you established the reason for the clustering problems
> encountered earlier was due to firewall configuration.
> On 16/03/12 17:25, John Stoner wrote:
> > We're looking to open fewer ports, not more./ /Is there a minimum we
> > could do? Would one work, or would it break something else?
> One port is possible (then inet_dist_listen_min = inet_dist_listen_max),
> but a small number like 5 is more common. Avoid the ephemeral port range
> when you make your selection.
> > Also, we have these ports open to all TCP.  In the spirit of securing
> > our systems, I guess we could open 4369 only to the IPs of the other
> > machines in the cluster. Is that a good idea? Can you think of more
> > firewall restrictions to add?
> As discussed previously and above, you need to open at least one port in
> addition to the one used by the port mapper daemon. You are free to add
> further firewall restrictions, as long as all clusternodes are
> accessible from all other clusternodes on the relevant ports, as
> discussed here:
> http://www.rabbitmq.com/clustering.html#firewall
> -Emile
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