[ovirt-users] questions on OVN

[Gianluca Cecchi]

On Wed, Feb 15, 2017 at 1:55 PM, Marcin Mirecki <mmirecki at redhat.com> wrote:

> Hello Gianluca,
>
> OVN is a tech preview feature in 4.1
> It's 'fully usable' as far as the basic networking functionality goes
> (network, ports, subnets),
>

OK, my question was mainly related to negative interference with other
parts of oVirt.
I plan to use it side by side with normal networking so that in the same
Cluster/Datacenter I can have VMs with "legacy" networks, VMs with OVN
provided networks and eventually VMs with a mix of the two.
BTW: I see that while I can hot add an OVN nic to a VM, I cannot hot edit
an OVN nic; I get the error:

Cannot edit Interface. External network cannot be changed while the virtual
machine is running.

Any plan to solve this?



> but it's still missing some parts like authentication, automatic host
> installation, some of the rest support and others.
>

Not a big problem for my tests.
With missing authentication do you mean that I could set up a non-oVirt
host installing controller and driver parts an let it join the others
without control?
Or keystone/similar integration?


> You can use ovirtmgmt for the OVN tunnels. How ovirtmgmt is configured is
> also not relevant for OVN.
> I am using a similar setup (without bonds) on my dev environment and it's
> working fine.
>

So I could have ovirtmgmt on a vlan based bonding and use it without
problems?
In the sense that the tunnel basically already realizes the isolation from
the ovirtmgmt network itself (what usually we do making vlans) without
interfering in case I have a great exchange of data for example over the
tunnel between 2 VMs placed on different hosts?

BTW: does it make sense to create another vlan on the bonding (that is
already setup with vlans), assigning an ip on the hosts and then use it?
Probably the answer above applies to this too...
In this case is it recommended to do it from inside oVirt itself or one can
do it manually in the OS (supposing plain CentOS configuration for
hypervisors)?

The same question could also apply to a general case where for example my
hosts have to integrate into a dedicated lan in the infrastructure (eg for
backup or monitoring or what else)... would I configure this lan from oVirt
or better from hosts themselves?

Thanks in advance for your time

Gianluca
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