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

[Tom]

Sent from my iPhone

> On Apr 5, 2018, at 5:29 AM, Yaniv Kaul <ykaul at redhat.com> wrote:
> 
> 
> 
>> 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.

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-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.
>>>> 
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>>>>         Users at ovirt.org <mailto:Users at ovirt.org>
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>>>> 
>>>> 
>>> 
>> 
>> 
>> -- 
>> Cheers,
>> Tom K.
>> -------------------------------------------------------------------------------------
>> 
>> Living on earth is expensive, but it includes a free trip around the sun.
>> 
> 
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