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

On 4/5/2018 8:59 AM, Tom wrote: > > > Sent from my iPhone > > On Apr 5, 2018, at 5:29 AM, Yaniv Kaul <ykaul(a)redhat.com <mailto: > ykaul(a)redhat.com&gt;&gt; wrote: > > >> >> On Thu, Apr 5, 2018 at 9:08 AM, TomK <tomkcpr(a)mdevsys.com <mailto: >> tomkcpr(a)mdevsys.com&gt;&gt; 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 > > "that can run on one of several (I suggest 3-8) of those hypervisors." To clarify. So if I have 3-8 copies of the oVirt Engine in a self-hosted config, only one can run at any one time? Is this correct?

Cheers, Tom >> >> Perhaps something like >> https://www.unixarena.com/2015/12/rhel-7-pacemaker-configuri >> ng-ha-kvm-guest.html >> <https://www.unixarena.com/2015/12/rhel-7-pacemaker-configur >> ing-ha-kvm-guest.html> >> . >> >> 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. >> >> >> -- Cheers, Tom K. ------------------------------------------------------------ ------------------------- Living on earth is expensive, but it includes a free trip around the sun. _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users