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

[Yaniv Kaul]

On Thu, Apr 5, 2018 at 9:08 AM, TomK <tomkcpr at mdevsys.com> wrote:

> On 4/4/2018 3:11 AM, Yaniv Kaul wrote:
>
>>
>>
>> On Wed, Apr 4, 2018 at 12:39 AM, Tom <tk at mdevsys.com <mailto:
>> tk at mdevsys.com>> wrote:
>>
>>
>>
>>     Sent from my iPhone
>>
>>     On Apr 3, 2018, at 9:32 AM, Yaniv Kaul <ykaul at redhat.com
>>     <mailto:ykaul at redhat.com>> wrote:
>>
>>
>>>
>>>     On Tue, Apr 3, 2018 at 3:12 PM, TomK <tomkcpr at mdevsys.com
>>>     <mailto:tomkcpr at 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.


>
>
> Perhaps something like https://www.unixarena.com/2015
>> /12/rhel-7-pacemaker-configuring-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>
>>>
>>>
>>>         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 at ovirt.org <mailto:Users at ovirt.org>
>>>         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.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20180405/e10c687f/attachment.html>