[ClusterLabs] 3 nodes cluster on Centos 7

[Andrei Borzenkov]

On Tue, Jul 7, 2015 at 12:19 PM, Nicolas S. <lists at tropicdreams.net> wrote:
> Hello everybody,
>
> I'm posting first time on this mailing list for an advice.
>
> I try actually trying to build a cluster on Centos 7.
>
> The cluster has 3 nodes :
>
> - 1 virtual machine (machine1). This machine is supposed to be
> high-available
> - 2 physical machines identical (machine2 and 3)
>
> The physical machines are supposed to use DRBD to replicate storage.
> A shared volume is going to be mounted on both machine 2 and 3 in read/write
> (gfs2).
>
> The virtual machine is only here for the vote in the qorum, it has no data .
>

It's not going to work. If host where this VM is running goes down,
quorum is lost.

> I m' following this guide :
> http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html/Clusters_from_Scratch/index.html
>
> My questions are  :
>
> - Is this configuration OK or shoud I better go to a 2 node only cluster ?
>

You need 2 node cluster with stonith.

> - Is there a way to "group" the storage machines 2 and 3 and put some
> ressources (like DRBD and GFS2) only on them ? So that  the machine 1 is
> here , but does nothing, just vote.
> I looked around in the pcs command line option but maybe i missed it.
>
>
> Thanks in advance
>
> Regards
>
> Nicolas.
>
>
>
>
>
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