[ClusterLabs] design of a two-node cluster

[Steffen Winther Sørensen]

Check something like [community version] ProxMox <http://proxmox.com/> great way to administer your KVMs

/Steffen

> On 7. dec. 2015, at 18.35, Lentes, Bernd <bernd.lentes at helmholtz-muenchen.de> wrote:
> 
> Hi,
> 
> i've been asking all around here a while ago. Unfortunately I couldn't
> continue to work on my cluster, so I'm still thinking about the design.
> I hope you will help me again with some recommendations, because when the
> cluster is running changing of the design is not possible anymore.
> 
> These are my requirements:
> 
> - all services are running inside virtual machines (KVM), mostly databases
> and static/dynamic webpages
> - I have two nodes and would like to have some vm's running on node A and
> some on node B during normal operation as a kind of loadbalancing
> - I'd like to keep the setup simple (if possible)
> - availability is important, performance not so much (webpages some
> hundred requests per day, databases some hundred inserts/selects per day)
> - I'd like to have snapshots of the vm's
> - live migration of the vm's should be possible
> - nodes are SLES 11 SP4, vm's are Windows 7 and severable linux
> distributions (Ubuntu, SLES, OpenSuSE)
> - setup should be extensible (add further vm's)
> - I have a shared storage (FC SAN)
> 
> My ideas/questions:
> 
> Should I install all vm's in one partition or every vm in a seperate
> partition ? The advantage of one vm per partition is that I don't need a
> cluster fs, right ?
> I read to avoid a cluster fs if possible because it adds further
> complexity. Below the fs I'd like to have logical volumes because they are
> easy to expand.
> Do I need cLVM (I think so) ? Is it an advantage to install the vm's in
> plain partitions, without a fs ?
> It would reduce the complexity further because I don't need a fs. Would
> live migration still be possible ?
> 
> snapshots:
> I was playing around with virsh (libvirt) to create snapshots of the vm's.
> In the end I gave up. virsh explains commands in its help, but when you
> want to use them you get messages
> like "not supported yet", although I use libvirt 1.2.11. This is
> ridiculous. I think I will create my snapshots inside the vm's using lvm.
> We have a network based backup solution (Legato/EMC) which saves the disks
> every night.
> Supplying a snapshot for that I have a consistent backup. The databases
> are dumped with their respective tools.
> 
> Thanks in advance.
> 
> 
> Bernd
> 
> --
> Bernd Lentes
> 
> Systemadministration
> institute of developmental genetics
> Gebäude 35.34 - Raum 208
> HelmholtzZentrum München
> bernd.lentes at helmholtz-muenchen.de
> phone: +49 (0)89 3187 1241
> fax: +49 (0)89 3187 2294
> 
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