Re: [ovirt-users] Put the engine inside hosts after installation

[Yedidyah Bar David]

- Original Message -
> From: "Donny Davis" 
> To: "Mario Giammarco" , users@ovirt.org
> Sent: Saturday, January 17, 2015 8:55:57 PM
> Subject: Re: [ovirt-users] Put the engine inside hosts after installation
> 
> When you install a new engine the only problem I can think of off the top of
> my head is the database… when you install the engine, you setup a database,
> and if this database was on a vm in the cluster I suppose you could have as
> many engines as you like I have not tried this, so please correct me if
> I am wrong.

This is currently not supported. See also [1].

[1] http://www.ovirt.org/Features/Engine_High_Availability

Best,
-- 
Didi
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Re: [ovirt-users] Put the engine inside hosts after installation

[Donny Davis]

Are you trying to use glusterFS as your hosted engine storage??

What problems are you having with the up and running tutorial?

I have been loosely following it, and have not run into anything that is not 
solvable.

 

Hosted-Engine is really the way to go, having your management machine HA is a 
super huge plus.

> 

> Can I after that install change my mind and so move the engine as a vm in the 
> cluster?

>Or can I install a new engine in the cluster and powerdown the first engine

 

When you install a new engine the only problem I can think of off the top of my 
head is the database… when you install the engine, you setup a database, and if 
this database was on a vm in the cluster I suppose you could have as many 
engines as you like I have not tried this, so please correct me if I am 
wrong.

 

Donny D

cloudspin.me

 

From: users-boun...@ovirt.org [mailto:users-boun...@ovirt.org] On Behalf Of 
Mario Giammarco
Sent: Friday, January 16, 2015 2:40 AM
To: users@ovirt.org
Subject: [ovirt-users] Put the engine inside hosts after installation

 

Hello,
I would like to try ovirt with hosted engine installation.

I had so many problems (I have written them in another thread) so I will not 
try anymore hosted installation (up and running with ovirt 3.5 tutorial)

But now I would try this approach: I install the engine on a dedicated server 
or as a virtual machine in another kvm based virtualizator.

Now I create an ovirt cluster and use it.

Can I after that install change my mind and so move the engine as a vm in the 
cluster?

Or can I install a new engine in the cluster and powerdown the first engine?

Thanks in advance for help,
Mario

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Re: [ovirt-users] Put the engine inside hosts after installation

[Alex Crow]

On 16/01/15 19:26, Mario Giammarco wrote:



2015-01-16 12:37 GMT+01:00 Simone Tiraboschi >:



HA capability is provided for other VMs by oVirt engine. But who
provide it if the engine itself is on a VM on the host that it's
managing?
HA for the Engine VM needs to be managed by the hosts and not the
Engine itself: so we have ovirt-hosted-engine-ha that ensure HA
for the engine VM, the engine cloud than provide HA for other VMs.

I am surprised. I supposed that HA was "self provided" by the cluster 
like in xenserver. So you tell me that is the engine that checks if 
servers and vms are on like in cloudstack?




This is just how any VM self-hosted setup would work. The 
'engine/management' VM has to have HA managed by something other than 
the engine itself - otherwise if the engine is down how would it know or 
be able to restart itself? In VMWare or Xenserver there would have to be 
a separate system other than that in the engine VM to make sure that the 
management engine VM is a) running on at least one host on the cluster 
and b) *cannot* be running on more than one host to avoid screwing its 
own storage volume (ie heartbeat/fencing).


Then this "managed engine" only has to take care of keeping its own VMs 
up. Logically I cannot see any other way this could possibly work - see 
"chicken and egg"!


Cheers

Alex


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Re: [ovirt-users] Put the engine inside hosts after installation

[Mario Giammarco]

2015-01-16 12:37 GMT+01:00 Simone Tiraboschi :

>
> HA capability is provided for other VMs by oVirt engine. But who provide
> it if the engine itself is on a VM on the host that it's managing?
> HA for the Engine VM needs to be managed by the hosts and not the Engine
> itself: so we have ovirt-hosted-engine-ha that ensure HA for the engine VM,
> the engine cloud than provide HA for other VMs.
>
> I am surprised. I supposed that HA was "self provided" by the cluster like
in xenserver. So you tell me that is the engine that checks if servers and
vms are on like in cloudstack?
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Re: [ovirt-users] Put the engine inside hosts after installation

[Simone Tiraboschi]

- Original Message -
> From: "Mario Giammarco" 
> To: "Simone Tiraboschi" 
> Cc: users@ovirt.org
> Sent: Friday, January 16, 2015 12:12:34 PM
> Subject: Re: [ovirt-users] Put the engine inside hosts after installation
> 
> 2015-01-16 11:16 GMT+01:00 Simone Tiraboschi :
> 
> >
> >
> > oVirt 3.5.1 RC1 will be published today so, if everything runs as
> > expected, oVirt 3.5.1 will be out in a few days. oVirt 3.5.1 should solve
> > the issue you reported.
> >
> 
> Ok I will wait 3.5.1 and try again.

Great, please help us reporting any other issue or strange thing.

> > Keep present that hosted-engine also installs and configures
> > ovirt-hosted-engine-ha daemon to ensure HA capabilities restarting the
> > engine VM if the host witch runs the VM goes down.
> > In the setup you are proposing you are loosing that capability.
> >
> 
> I supposed the ha capability was offered by ovirt cluster. I need to
> investigate.

HA capability is provided for other VMs by oVirt engine. But who provide it if 
the engine itself is on a VM on the host that it's managing?
HA for the Engine VM needs to be managed by the hosts and not the Engine 
itself: so we have ovirt-hosted-engine-ha that ensure HA for the engine VM, the 
engine cloud than provide HA for other VMs.

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Re: [ovirt-users] Put the engine inside hosts after installation

[Mario Giammarco]

2015-01-16 11:16 GMT+01:00 Simone Tiraboschi :

>
>
> oVirt 3.5.1 RC1 will be published today so, if everything runs as
> expected, oVirt 3.5.1 will be out in a few days. oVirt 3.5.1 should solve
> the issue you reported.
>

Ok I will wait 3.5.1 and try again.

>
> Keep present that hosted-engine also installs and configures
> ovirt-hosted-engine-ha daemon to ensure HA capabilities restarting the
> engine VM if the host witch runs the VM goes down.
> In the setup you are proposing you are loosing that capability.
>

I supposed the ha capability was offered by ovirt cluster. I need to
investigate.
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Re: [ovirt-users] Put the engine inside hosts after installation

[Simone Tiraboschi]

- Original Message -
> From: "Mario Giammarco" 
> To: users@ovirt.org
> Sent: Friday, January 16, 2015 10:39:44 AM
> Subject: [ovirt-users] Put the engine inside hosts after installation
> 
> Hello,
> I would like to try ovirt with hosted engine installation.
> I had so many problems (I have written them in another thread) so I will not
> try anymore hosted installation (up and running with ovirt 3.5 tutorial)

oVirt 3.5.1 RC1 will be published today so, if everything runs as expected, 
oVirt 3.5.1 will be out in a few days. oVirt 3.5.1 should solve the issue you 
reported.

> But now I would try this approach: I install the engine on a dedicated server
> or as a virtual machine in another kvm based virtualizator.
> 
> Now I create an ovirt cluster and use it.
> 
> Can I after that install change my mind and so move the engine as a vm in the
> cluster?

As far as you maintain the same host name and a compatible network topology it 
should work without any hassle.

Keep present that hosted-engine also installs and configures 
ovirt-hosted-engine-ha daemon to ensure HA capabilities restarting the engine 
VM if the host witch runs the VM goes down.
In the setup you are proposing you are loosing that capability.

> Or can I install a new engine in the cluster and powerdown the first engine?
> 
> Thanks in advance for help,
> Mario
> 
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