[rabbitmq-discuss] [Q] Cluster configuration is not retained by node after restart

Wed Jun 27 14:35:08 BST 2012

Nope, I'm not reissuing the commands.

One part I omitted was that there was an previous install of Rabbit on
the server, but the rpm was removed, and an rm -r /var/lib/rabbitmq/*
was done. The .erlang.cookie was also removed, and I double checked that
the mnesia files were definitely removed afore I did anything.

On 27/06/12 15:31, Simon MacMullen wrote:
> By "reclustering" I just mean reissuing "rabbitmqctl reset"
> "rabbitmqctl cluster ..." commands, and thus redefining the cluster.
>
> Alternatively, could something be removing files from
> /var/lib/rabbitmq/mnesia/ ?
>
> Cheers, Simon
>
> On 27/06/12 14:24, Simon Loewenthal wrote:
>> Hi Simon,
>>
>>     I rebooted both servers :  /# reboot/
>>     You've given a good reason to move to 2.8.n
>>
>>     >  Are you definitely not reclustering at any stage?
>>     Apologies, but I don't  understand the term reclustering.
>>
>> S.
>>
>>
>>
>> On 27/06/12 15:20, Simon MacMullen wrote:
>>> Hi.
>>>
>>> You say you "reboot the server" - is this node 1, node 2, or both?
>>>
>>> The description you have after rebooting the server is consistent with
>>> having one RAM node and one disc node and restarting both of them - in
>>> 2.7.0 if the RAM node came back up first it would create a blank
>>> database. This was fixed in 2.8.x, in that now a RAM node will refuse
>>> to start if there are no disc nodes to connect to.
>>>
>>> However, when you initially create the cluster you are creating both
>>> nodes as disc nodes. So I am puzzled as to how you could have got to
>>> the state where one node was a RAM node. Are you definitely not
>>> reclustering at any stage?
>>>
>>> Cheers, Simon
>>>
>>> On 27/06/12 12:48, S.Loewenthal wrote:
>>>> Hi there,
>>>>
>>>> I installed RabbitMQ server but cannot get one node to retain the
>>>> cluster configuration. Step-by-step account follows for what I did to
>>>> configure these nodes.
>>>> Node 1: rabbit at iuu-7
>>>> Nide 2: rabbit at iuu-8
>>>>
>>>>
>>>> On both nodes install 2.7.0 - This version as all other environment
>>>> run
>>>> same version.
>>>> # rpm -ivh rabbitmq-server-2.7.0-1.noarch.rpm
>>>>
>>>> Start Node 2 (if not already running)
>>>> # /etc/init.d/rabbitmq-server start
>>>>
>>>> Shutdown RabbitMQ on Node 2
>>>> # /etc/init.d/rabbitmq-server stop
>>>>
>>>> Copied the Erlang cookie so that both nodes have the same cookie, or
>>>> else these won't talk with each other
>>>> Copy (Node 1) iuu-7:/var/lib/rabbitmq/.erlang.cookie to (Node 2)
>>>> iuu-8:/var/lib/rabbitmq/.erlang.cookie
>>>> permissions and ownership are : Perms 400 -- Owner rabbitmq:rabbitmq
>>>>
>>>> Start RabbitMQ on Node 2
>>>> # /etc/init.d/rabbitmq-server start
>>>>
>>>> Verify that each node can communicate with each other:
>>>> On Node 1
>>>> $ rabbitmqctl -n rabbit at iuu-8 status
>>>> On Node 2
>>>> $ rabbitmqctl -n rabbit at iuu-7 status
>>>>
>>>> Reset Node 2 so that it is ready to join the cluster on Node 1
>>>> $ rabbitmqctl stop_app
>>>> $ rabbitmqctl reset
>>>>
>>>> Add the Node 2 to the first node with disc writing enabled on both
>>>> nodes:
>>>> $ rabbitmqctl cluster rabbit at iuu-7 rabbit at iuu-8
>>>>
>>>> Start the app on Node 2
>>>> $ rabbitmqctl start_app
>>>>
>>>> Verify the cluster status on Node 2 and the same on Node 1
>>>> $ rabbitmqctl cluster_status
>>>> Cluster status of node 'rabbit at iuu-8' ...
>>>> [{nodes,[{disc,['rabbit at iuu-8','rabbit at iuu-7']}]},
>>>> {running_nodes,['rabbit at iuu-7','rabbit at iuu-8']}]
>>>> ...done.
>>>>
>>>> next I add a few users, and reboot the server. Now the cluster is
>>>> disconnection, and I cannot get ot to connnect. Also, the users added
>>>> afore the reboot no longer exist.
>>>>
>>>> It comes up without the cluster information nor the users:
>>>> [root at iuu-7 ~]# rabbitmqctl cluster_status
>>>> Cluster status of node 'rabbit at iup-7' ...
>>>> [{nodes,[{ram,['rabbit at iuu-7']}]},{running_nodes,['rabbit at iuu-7']}]
>>>> ...done.
>>>>
>>>> [root at iup-8 ~]# rabbitmqctl cluster_status
>>>> Cluster status of node 'rabbit at iup-' ...
>>>> [{nodes,[{disc,['rabbit at iup-8']},{ram,['rabbit at iup-7']}]},
>>>> {running_nodes,['rabbit at iup-8']}]
>>>> ...done.
>>>>
>>>> The cluster configuration does not survive a server restart and in
>>>> this
>>>> case user account was was lost. I imagine that I have misconfigured
>>>> something.
>>>>
>>>> ** The question **
>>>> How can I ensure that the cluster reconnects after rabbitmq-server
>>>> restarts, and that data that was written is retained? Or, what did I
>>>> misconfigure
>>>>
>>>>
>>>>
>>>> Many thanks, S.
>>>>
>>>>
>>>> _______________________________________________
>>>> rabbitmq-discuss mailing list
>>>> rabbitmq-discuss at lists.rabbitmq.com
>>>> https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss
>>>
>>>
>>
>>
>
>

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	     simon @ klunky  .     org
	     simon @ klunky  .   co.uk
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