[rabbitmq-discuss] unable to cluster rabbitmq on ec2

Tim Watson tim at rabbitmq.com
Thu Jul 19 11:19:17 BST 2012

Also, have you been through http://www.rabbitmq.com/troubleshooting.html 
and http://www.rabbitmq.com/clustering.html in detail to make sure 
you're not missing any steps?

On 07/19/2012 11:13 AM, Tim Watson wrote:
> On 07/19/2012 10:18 AM, avinash0601 wrote:
>> hey Tim,
> Hi!
>> i have 3 instances for clustering on ec2.
>> i dont want to use the hostnames provided by amazon so my hostnames 
>> now are
>> rabbit1, rabbit2&  rabbit3.
> Ok. You've set this up how? What OS are you running, what does the 
> /etc/hosts look like?
>> i have restricted epmd communication to ports 9100-9105 in
>> /usr/lib/erlang/bin/sys.config by making en entry
>> *[{kernel,[{inet_dist_listen_min, 9100},{inet_dist_listen_max,9105}]}].*
> Well that doesn't actually control what ports epmd uses, but the ports 
> on which the node started with these kernel parameters will accept 
> connections from other nodes that are registered with the port mapper 
> daemon. The port on which epmd listens is controlled by either passing 
> -port <port-num: default=4369> or setting tghe ERL_EPMD_PORT 
> environment variable.
>> opened ports 5672, 55672, 4369, 9100-9105 on all 3 instances.
> On each machine that will host distributed Erlang nodes, the naming 
> server (epmd) must be running. If you wish to inter-connect nodes 
> between these machines, their epmd instances must be accessible to the 
> outside world (on whatever port(s) they're running on). These (epmd) 
> ports have to be open, and the cookie security system ensures that 
> unauthorised connections to nodes on the individual hosts are disallowed.
> If the port that epmd is running on for each of these instances is not 
> open, then clustering will not work, as the nodes will not be able to 
> communicate.
>> so on rabbit1 i did stop_app, reset&  then trying to create a cluster by
>> *rabbitmqctl cluster rabbit at rabbit2 rabbit at rabbit1* its saying
>> *Clustering node rabbit at rabbit1 with [rabbit at rabbit2,rabbit at rabbit1] ...
>> Error: {no_running_cluster_nodes,[rabbit at rabbit2],[rabbit at rabbit2]}*
>> do i need to do something else.
> Check that epmd on each node is accessible from all the others. You 
> can do this by attempting to telnet from the other nodes: `telnet 
> rabbit1 4369` should succeed.
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