On 4/5/2018 8:59 AM, Tom wrote:
Sent from my iPhone
On Apr 5, 2018, at 5:29 AM, Yaniv Kaul <ykaul@redhat.com <mailto:ykaul@redhat.com>> wrote:
On Thu, Apr 5, 2018 at 9:08 AM, TomK <tomkcpr@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@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@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@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
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?
"that can run on one of several (I suggest 3-8) of those hypervisors."
Cheers,
Tom
<mailto:Users@ovirt.org <mailto:Users@ovirt.org>>
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.
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-- Cheers,
Tom K.
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Living on earth is expensive, but it includes a free trip around
the sun.
--
Cheers,
Tom K.
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