Re: [ovirt-users] oVirt non-self-hosted HA

Sent from my iPhone On Apr 5, 2018, at 5:29 AM, Yaniv Kaul <ykaul(a)redhat.com <mailto:ykaul@redhat.com>> wrote: > > > On Thu, Apr 5, 2018 at 9:08 AM, TomK <tomkcpr(a)mdevsys.com > <mailto:tomkcpr@mdevsys.com>> wrote: > > On 4/4/2018 3:11 AM, Yaniv Kaul wrote: > > > > On Wed, Apr 4, 2018 at 12:39 AM, Tom <tk(a)mdevsys.com > <mailto:tk@mdevsys.com> <mailto:tk@mdevsys.com > <mailto:tk@mdevsys.com>>> wrote: > > > >     Sent from my iPhone > >     On Apr 3, 2018, at 9:32 AM, Yaniv Kaul <ykaul(a)redhat.com > <mailto:ykaul@redhat.com> >     <mailto:ykaul@redhat.com <mailto:ykaul@redhat.com>>> wrote: > > > >     On Tue, Apr 3, 2018 at 3:12 PM, TomK > <tomkcpr(a)mdevsys.com <mailto:tomkcpr@mdevsys.com> >     <mailto:tomkcpr@mdevsys.com > <mailto:tomkcpr@mdevsys.com>>> wrote: > >         Hey Guy's, > >         If I'm looking to setup the oVirt engine in an HA >         configuration off the physical servers hosting my > VM's (non >         self hosted), what are my options here? > >         I want to setup two to four active oVirt engine > instances >         elsewhere and handle the HA via something like > haproxy / >         keepalived to keep the entire experience seamless > to the user. > > >     You will need to set up the oVirt engine service as > well as the PG >     database (and ovirt-engine-dwhd service and any other > service we >     run next to the engine) as highly available module. >     In pacemaker[1], for example. >     You'll need to ensure configuration is also sync'ed > between nodes, >     etc. >     Y. > > >     So already have one ovirt engine setup separately on a vm that >     manages two remote physical hosts.  So familiar with the > single host >     approach which I would simply replicate.  At least that’s > the idea >     anyway.  Could you please expand a bit on the highly available >     module and  syncing the config between hosts? > > > That's a different strategy, which is also legit - you treat > this VM as a highly available resource. Now you do not need to > sync the config - just the VM disk and config. > > > I think there's a postgres component too and if oVirt engine keeps > all it's date on the postgres tables, then synchronizing this > piece might be all I need?  I'm not sure how the separate oVirt > engines sitting on various separate physical hosts keep their > settings in sync about the rest of the physicals in an oVirt > environment. (Assume we may have 100 oVirt physicals for example.) > > > There's more than just the database, although it contains 99% of what > you need. See the content of the result of 'engine-backup' command. > I think you might be somewhat confusing between the number of oVirt > hypervisors (we support hundreds) and the Engine - the management, > which is single - and with hosted-engine, it's a single, but highly > available virtual machine - that can run on one of several (I suggest > 3-8) of those hypervisors. > Y. Yah, still very new to much of this.  Thank you again. I’ll take that away and do some reading. Cheers, Tom

> > > Perhaps something like > https://www.unixarena.com/2015/12/rhel-7-pacemaker-configuring-ha-kvm-gue... > <https://www.unixarena.com/2015/12/rhel-7-pacemaker-configuring-ha-kvm-gue... > . > > But if you are already doing that, I'm not sure why you'd > prefer this over hosted-engine setup. > > > I'm comparing both options.  I really don't want to ask too many > specific until I have the chance to read into the details of both. > > Y. > > > Cheers, > Tom > > > >     Cheers, >     Tom > > >     [1] https://clusterlabs.org/quickstart-redhat.html > <https://clusterlabs.org/quickstart-redhat.html> >     <https://clusterlabs.org/quickstart-redhat.html > <https://clusterlabs.org/quickstart-redhat.html>> > > >         From what I've seen in oVirt, that seems to be > possible >         without the two oVirt engines even knowing each > other's >         existence but is it something anyone has ever > done?  Any >         recommendations in this case? > >         Having settings replicated would be a bonus but I > would be >         comfortable if they weren't and I handle that myself. > >         --         Cheers, >         Tom K. > > ------------------------------------------------------------------------------------- > >         Living on earth is expensive, but it includes a > free trip >         around the sun. > >         _______________________________________________ >         Users mailing list > Users(a)ovirt.org <mailto:Users@ovirt.org> > <mailto:Users@ovirt.org <mailto:Users@ovirt.org>> > http://lists.ovirt.org/mailman/listinfo/users > <http://lists.ovirt.org/mailman/listinfo/users> >         <http://lists.ovirt.org/mailman/listinfo/users > <http://lists.ovirt.org/mailman/listinfo/users>> > > > > > > -- > Cheers, > Tom K. > ------------------------------------------------------------------------------------- > > Living on earth is expensive, but it includes a free trip around > the sun. > >