[ovirt-users] Advise needed: building cheap HA oVirt cluster with just 2 physical servers

Wed Nov 8 09:52:12 UTC 2017

Hi,

Can anyone share their experience on deploying hosted-engine with GlusterFS
cluster?

I managed to setup a GlusterFS cluster and started to deploy hosted engine.
At first stage I was beaten by firewall rules - the deployment process
interrupted at GlusterFS config stage.
After fixing the rules I got engine up and running, but the host is
non-operational state still. Logged in to Web UI -> and see 2 action
points: "Gluster command failed on server" and Gluster status is
disconnected for this server"

This is a bit strange, since the cluster was properly detected during
deployment and deployment script was supposed to configure the cluster.

          --== STORAGE CONFIGURATION ==--

          Please specify the storage you would like to use (glusterfs,
iscsi, fc, nfs3, nfs4)[nfs3]: glusterfs
[ INFO  ] Please note that Replica 3 support is required for the shared
storage.
          Please specify the full shared storage connection path to use
(example: host:/path): xxxx.xxxxx.xx:/oVirt
[ INFO  ] GlusterFS replica 3 Volume detected
          Do you want to configure this host and its cluster for gluster?
(Yes, No) [No]: Yes
[ INFO  ] GlusterFS replica 3 Volume detected

Any ideas how to fix this?

Thanks in advance!
Regards,
Artem

On Fri, Nov 3, 2017 at 2:28 PM, Martin Sivak <msivak at redhat.com> wrote:

> Hi,
>
> cockpit is enabled by default when you use ovirt-node. You will
> probably have to install the necessary cockpit packages yourself on
> pure CentOS - you will need cockpit and ovirt + gdeploy cockpit
> plugins (sadly I do not recall the exact package names).
>
> With regards to arbiter and the wizard.. I really do not know, but I
> will alert my colleagues who might have more detailed knowledge of the
> gluster part.
>
> Denis, Sahina: can you please help me here?
>
> Best regards
>
> Martin Sivak
>
> On Fri, Nov 3, 2017 at 11:29 AM, Artem Tambovskiy
> <artem.tambovskiy at gmail.com> wrote:
> > Thanks for an article, Martin!
> > Any chance to configure a third cost to act as GlusterFS Arbitr only
> using
> > this wizard?
> >
> > And stupid question - how to make this wizard up and running? I've
> > everything installed and nothing is runnin on port 9090 :)
> >
> > Regards,
> > Artem
> >
> > On Fri, Nov 3, 2017 at 12:49 PM, Martin Sivak <msivak at redhat.com> wrote:
> >>
> >> Hi,
> >>
> >> you should take a look at the hyper converged way of installing oVirt.
> >> We have a cockpit wizard that does almost everything for you:
> >>
> >>
> >> https://www.ovirt.org/documentation/gluster-
> hyperconverged/chap-Deploying_Hyperconverged/
> >>
> >> It uses three hosts and collocates the VMs together with Gluster
> storage.
> >>
> >> Best regards
> >>
> >> --
> >> Martin Sivak
> >> SLA  /oVirt
> >>
> >> On Fri, Nov 3, 2017 at 8:39 AM, Artem Tambovskiy
> >> <artem.tambovskiy at gmail.com> wrote:
> >> > Thanks Eduardo!
> >> >
> >> > I think I can find a third server to build a glusterFS storage. So the
> >> > first
> >> > step will be to install a self-hosted engine on the new server and
> start
> >> > building a glusterFS storage. IS there any easy way to migrate
> existing
> >> > 5
> >> > VM's running on the second bare-metal oVirt host, right? I found a
> >> > little
> >> > bit tricky moving oVirt backups between the hosts (at least I failed
> to
> >> > replicate the existing VM's on the second server).
> >> >
> >> > Regards,
> >> > Artem
> >> >
> >> >
> >> >
> >> > On Fri, Nov 3, 2017 at 10:24 AM, Eduardo Mayoral <emayoral at arsys.es>
> >> > wrote:
> >> >>
> >> >> For HA you will need some kind of storage available to all the
> compute
> >> >> nodes in the cluster. If you have no external storage and few nodes,
> I
> >> >> think
> >> >> your best option for storage is gluster , and the minimum number of
> >> >> nodes
> >> >> you will need for HA is 3 (the third gluster node can be
> metadata-only,
> >> >> but
> >> >> you still need that third node to give you quorum, avoid split-brains
> >> >> and
> >> >> have something that you can call "HA" with a straight face.
> >> >>
> >> >> Eduardo Mayoral Jimeno (emayoral at arsys.es)
> >> >> Administrador de sistemas. Departamento de Plataformas. Arsys
> internet.
> >> >> +34 941 620 145 ext. 5153
> >> >>
> >> >> On 03/11/17 08:10, Artem Tambovskiy wrote:
> >> >>
> >> >> Looking for a design advise on oVirt provisioning. I'm running a PoC
> >> >> lab
> >> >> on single bare-metal host (suddenly it was setup with just Local
> >> >> Storage
> >> >> domain) and
> >> >> no I'd like to rebuild the setup by making a cluster of 2 physical
> >> >> servers, no external storage array available. That are the options
> >> >> here? is
> >> >> there any options to build cheap HA cluster with just 2 servers?
> >> >>
> >> >> Thanks in advance!
> >> >>
> >> >> Artem
> >> >>
> >> >>
> >> >> _______________________________________________
> >> >> Users mailing list
> >> >> Users at ovirt.org
> >> >> http://lists.ovirt.org/mailman/listinfo/users
> >> >>
> >> >>
> >> >
> >> >
> >> > _______________________________________________
> >> > Users mailing list
> >> > Users at ovirt.org
> >> > http://lists.ovirt.org/mailman/listinfo/users
> >> >
> >
> >
>
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