[Linux-cluster] Simple data replication in a cluster

[Rick Stevens]

On 04/03/2014 01:58 PM, Vallevand, Mark K issued this missive:
> I’m looking for a simple way to replicate data within a cluster.
>
> It looks like my resources will be self-configuring and may need to push
> changes they see to all nodes in the cluster.  The idea being that when
> a node crashes, the resource will have its configuration present on the
> node on which it is restarted.  We’re talking about a few kb of data,
> probably in one file, probably text.  A typical cluster would have
> multiple resources (more than two), one resource per node and one extra
> node.
>
> Ideas?
>
> Could I use the CIB directly to replicate data?  Use cibadmin to update
> something and sync?
>
> How big can a resource parameter be?  Could a resource modify its
> parameters so that they are replicated throughout the cluster?
>
> Is there a simple file replication Resource Agent?
>
> Drdb seems like overkill.

If you're OK with it and it's a small group of files/directories,
why not use something like inotifywait and have it run a script that
rsyncs the altered files to the other nodes when the files change? I've
done it before and it works pretty well.
-- 
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- Rick Stevens, Systems Engineer, AllDigital    ricks at alldigital.com -
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