[rabbitmq-discuss] Clustering Serwer Question

[Adam Kaminiecki]

So you mean I need to install and configure external sofware on external 
machine for redundant durable queues and persistent messages?
It's little strange for me ;/

Regards,
Adam


W dniu 2010-12-01 11:16, Alexandru Scvorţov pisze:
> Hi,
>
>> My question is how can i change a cluster type from ram to disk? I have
>> 2 serwers and 1 node in each of them. Need I have 3 servers to do it
>> like in tutorial http://www.rabbitmq.com/clustering.html#creating?
> The nodes are either ram or disc.  When you issue the cluster command,
> the nodes passed as arguments are the disc nodes.  From the clustering
> guide,
>
> rabbit2$ rabbitmqctl cluster rabbit at rabbit1
> Clustering node rabbit at rabbit2 with [rabbit at rabbit1] ...done.
>
> rabbit1$ rabbitmqctl status
> Status of node rabbit at rabbit1 ...
> [...,
>    {nodes,[{disc,[rabbit at rabbit1]},{ram,[rabbit at rabbit2]}]},
>    {running_nodes,[rabbit at rabbit2,rabbit at rabbit1]}]
> ...done.
>
> rabbit2$ rabbitmqctl status
> Status of node rabbit at rabbit2 ...
> [...,
>    {nodes,[{disc,[rabbit at rabbit1]},{ram,[rabbit at rabbit2]}]},
>    {running_nodes,[rabbit at rabbit1,rabbit at rabbit2]}]
> ...done.
>
> In the above example, we create a cluster of two nodes, rabbit1 is disc
> (because it's in the arguments to the cluster command), and rabbit2 is
> ram.
>
> Two nodes is enough for a cluster.
>
>> If I have persistent queue declared od serwer 1 when serwer 1 is down in
>> second serwer this queue dissappear. When I will change cluster typ this
>> behavior will change? Is it possible change it behavior about persistent
>> queue when serwers are in cluster?
> No.
>
> A queue can only exist on one node at a time.  If said node dies, the
> queue disappears or becomes unusable: durable queues become unusable
> until the node comes back online (they cannot be redeclared on another
> node), non-durable queues just disappear (but can be redeclared on
> another node).
>
> If you need to not lose messages and have the queue available even after
> a node death, you might want to have a look at the HA with Rabbit guide:
>    http://www.rabbitmq.com/pacemaker.html
>
> Cheers,
> Alex
>
> On Wed, Dec 01, 2010 at 10:03:04AM +0100, Adam Kaminiecki wrote:
>> Hi,
>>
>> My question is how can i change a cluster type from ram to disk? I have
>> 2 serwers and 1 node in each of them. Need I have 3 servers to do it
>> like in tutorial http://www.rabbitmq.com/clustering.html#creating?
>>
>>
>> Another question is:
>> If I have persistent queue declared od serwer 1 when serwer 1 is down in
>> second serwer this queue dissappear. When I will change cluster typ this
>> behavior will change? Is it possible change it behavior about persistent
>> queue when serwers are in cluster?
>>
>>
>>
>> Regards,
>> Adam
>>
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