Hi,
the situation is significantly different in case you say that Foreman is not
deterministic in supplying NICs via API.
So all this determinism in ‘first interface gets lowest MAC/lowest PCI’ is not
helpful because you essential don’t know which interface becomes the first one.
In fact, I am not sure if your OS uses ‘lowest PCI’ or ‘lowest MAC’ for
ordering, I think that ‘lowest PCI’ is much more widespread.
A few ideas:
-I think that slightly more elegant: maybe the idea is to
create VM with first NIC, then add second NIC and then start your VM?
-I am not sure what is your OS, but udev rules is a powerful mechanism to
control NIC assignment.
In case you say that behaviour of Foreman can’t be addressed – you might change
MTU by 1 byte for certain network (1499) then use this attribute to find that
NIC
ATTR{mtu} or modify creation of VM to create one vNIC with link state=down and
then use ATTR{operstate}
BR,
Konstantin
Von: Alan G <[email protected]>
Datum: Mittwoch, 24. Mai 2023 um 15:46
An: "Volenbovskyi, Konstantin" <[email protected]>
Cc: Guillaume Pavese <[email protected]>, users
<[email protected]>
Betreff: [ovirt-users] Re: NIC Ordering
Perhaps it's more of a Foreman/API limitation.
In Foreman I provision two interfaces, that in the Foreman UI at least, have an
ordering. Sometimes when they are provisioned in oVirt the "second" interface
has a lower MAC than the "first" interface and so the ordering in Foreman is
different to the ordering in oVIrt.
This breaks a bunch of stuff that relies on the networks being on specific
interface (eth0, eth1).
---- On Wed, 24 May 2023 14:09:33 +0100 Volenbovskyi, Konstantin
<[email protected]> wrote ---
Hi,
Do I understand it correctly that:
-your OS uses PCI addresses to order NICSs?
-PCI addresses of NICs are in fact non-consistent between VMs?
So you boot VM1 (with NICs vNIC1 and vNIC2) and VM2 (vNIC3 and vNIC4) with same
order in eg. API (->GUI) and you sometimes see different PCI addresses (vNIC2
has higher PCI address than vNIC1; however vNIC3 has higher PCI address than
vNIC4)? I am surprised about that…
BR,
Konstantin
Von: Alan G <[email protected]<mailto:[email protected]>>
Datum: Mittwoch, 24. Mai 2023 um 10:50
An: Guillaume Pavese
<[email protected]<mailto:[email protected]>>
Cc: users <[email protected]<mailto:[email protected]>>
Betreff: [ovirt-users] Re: NIC Ordering
I don't create the VMs directly in the UI but use the API with Foreman. If I
change the MACs on the NICs I have to go back and update Foreman as well.
My workaround today is unplug the NIC I want to be second, briefly power-up the
VM so the "first" NIC gets assigned a PCI address, shutdown and re-plug the
"second" NIC. On power-up the "second" NIC will be assigned a later PCI address
and so achieve the ordering I want.
It's just fiddly and can only be done on first boot. I was hoping for a more
elegant solution that works when you have large numbers of VMs to provision.
---- On Wed, 24 May 2023 08:09:21 +0100 Guillaume Pavese
<[email protected]<mailto:[email protected]>>
wrote ---
I think it depends on the mac addresses.
If you see that the MAC addresses are not sequential, delete the NICs and
recreate them in the order you want them to be
it world for us
Guillaume Pavese
Ingénieur Système et Réseau
Interactiv-Group
On Wed, May 24, 2023 at 1:46 AM Alan G
<[email protected]<mailto:alan%[email protected]>> wrote:
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Is there any way to enforce NIC ordering so the vNICs match the ordering in the
Engine UI?
I found this but not clear if it was ever implemented?
https://www.ovirt.org/develop/release-management/features/network/predictable-vnic-order.html
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