[ClusterLabs] 3 nodes cluster on Centos 7

[Nicolas S.]

7 juillet 2015 11:26 "Andrei Borzenkov" <arvidjaar at gmail.com> a écrit:
> 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 must maybe precise : the VM isnt located on one of the physical machine, it is on another place, so if the host of the vm goes down, the 2 physical nodes still remain. So quorum isnt't 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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