[Linux-HA] Active-passive cluster, best practice question

[Jonathan Schaeffer]

Le 08/02/2012 16:06, Michael Schwartzkopff a écrit :
>>>>> On 2/8/2012 at 01:46 AM, Jonathan Schaeffer
>>>>> <jonathan.schaeffer at univ-brest.fr>
>>
>> wrote:
>>> I wanted to know if it is good practice (or common enough) to build a
>>> filesystem containing configuration data for the clustered services.
>>
>> Yes. Pretty much all of my clustered resource groups contain a Filesystem
>> resource so that the service and its data can move between cluster nodes.
> 
> Application data: yes.
> 
> For configuration data, like /etc/your-service.conf that changes parhaps once 
> every half year, you could think about rsync to keep the configs in sync on 
> the nodes.

Thanks for your feedbacks.

The rsync method is very simple to implement on 2 nodes ...but does it
scale with 5 nodes or so ? If a modification is done on one node, how
would rsync propagate it on every other ?

I am considering one of these 2 options :

- mounting a filesystem (iSCSI LUN probably) containing the configuration
or
- having a central configuration system like puppet to ensure that the
config is consistent everywhere (I thought about this one today)

second option seduces me a lot. It's more work to do, but it would help
to have a consistent cluster node, and would make adding new node to the
cluster trivial operation.

jonathan


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