Open Stack

Hello Han:

If you are trying to create a bond, you'll need to perform that operation
inside the VM. The problem, at least for ML2/OVS and ML2/OVN, is that the
traffic egressing from this interface won't match the MAC address
configured. This traffic will be dropped because of the ARP spoofing rules
unless you disable "port_security_enabled". I'm not sure (I've never
tested) if LACP mode will work in these backends. In any case, what is the
user case? Isn't it better to make this bond in the host interfaces? [1]

The IP allocation of a port is something that cannot be manually set. This
value will depend on the DHCP configuration:

   - If the network has a subnet, the Neutron server will try to assign an
   IP. If you don't have routed provider network, the value will be "immediate"
   - For routed provider networks (that I don't think is your case), the
   value will be "deferred" and will depend on the host the port is bound.
   - If you choose --no-fixed-ip when creating the port, the value will be
   "none".


The functionality you are looking for was implemented in Nova in [2], *but
this is available in Yoga, not in Victoria*. This feature allows you to
create an IP-less port and use it to spawn a VM.

Regards.

[1]
https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2/html/advanced_overcloud_customization/assembly_network-interface-bonding
[2]https://review.opendev.org/c/openstack/nova/+/669411


On Wed, Apr 19, 2023 at 4:27 PM 韩光宇 <hanguangyu2 at gmail.com> wrote:

> Hello,
>
> I have a victoria cluster. I am a bit perplexed about OpenStack
> networking and was wondering if you could enlighten me on the topic.
>
> 1. bond
> When configuring bond interfaces (bond0/1/2/3) in an OpenStack
> instance, can I follow the same steps as I would on a physical
> machine? Are there any particular considerations to keep in mind?
> Also, when it comes to switch configuration, do I configure virtual
> machine switches directly or are there specific OpenStack interfaces
> to use?
>
> 2.
> `openstack port create --network net1 --no-fixed-ip port_net1`
> I was able to obtain a port with an ip_allocation value of "none"
> using the above command. I noticed that the ip_allocation value can be
> set to "none", "deferred", or "immediate". Is there a CLI interface to
> modify the ip_allocation value of a port, for example, changing "none"
> to "deferred"? Alternatively, what is the recommended method to make
> this change?
>
> 3.
> Is it possible for users to set IP addresses within an instance
> system? For example, if I create an instance without an IP address, is
> there a mechanism that allows me to set an IP address within the
> instance system, or can I only modify the port bindings or switch
> ports externally to change the IP address of an instance?
>
> Thank you for your attention to this matter.
> Best regards,
> Han Guangyu
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.openstack.org/pipermail/openstack-discuss/attachments/20230419/2d2873c7/attachment.htm>