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Hi Rodolfo,

Thanks for the response, and sorry for the confusion which can be caused by
my lack of knowledge about how ovn is implemented in openstack. I have seen
following blueprint (not for OVN obviosly):

https://wiki.openstack.org/wiki/Neutron/enable-to-set-dhcp-port-attributes

and somehow thought that dhcp has an ip address assigned also in OVN.

When I checked it once more I found out that device_id of the port has
prefix ovnmeta-, which means that it is not dhcp but metadata agent or
proxy:

$ openstack port show -f table -c id -c fixed_ips -c device_id
4f70acdf-59e9-4252-9f0c-c71eb68baa9a
+-----------+---------------------------------------------------------------------------+
| Field     | Value
            |
+-----------+---------------------------------------------------------------------------+
| device_id | ovnmeta-61d55c5b-adeb-440e-a029-796e783fdc02
             |
| fixed_ips | ip_address='172.16.0.1',
subnet_id='4632d9e5-6918-415e-b752-9f828e57404c' |
| id        | 4f70acdf-59e9-4252-9f0c-c71eb68baa9a
             |
+-----------+---------------------------------------------------------------------------+

Is it possible to set another ip address of this port during creation of
the subnet, or afterwards?

Thanks

On Wed, Sep 20, 2023 at 10:22 AM Rodolfo Alonso Hernandez <
ralonsoh at redhat.com> wrote:

> Hello Kamil:
>
> I'm not sure what you are asking for, sorry. In ML2/OVN, the DHCP server
> is local (in the same compute node where the VM is spawned) and has no IP
> address. The local OVS instance will capture the DHCP requests and reply to
> them.
>
> If you are asking for a VM port with a static IP address, this is
> something you can currently do creating a port and setting the fixed IP
> address [1].
>
> Can you share the blueprint you are referring to? How do you plan to
> migrate VMs to a different cloud?
>
> Regards.
>
> [1]https://paste.opendev.org/show/bl87sEpUnZttIMxN9fyc/
>
> On Wed, Sep 20, 2023 at 9:52 AM Kamil Madac <kamil.madac at gmail.com> wrote:
>
>> Hello OpenStack community,
>>
>> I'd like to ask whether it's possible to set a static fixed IP address
>> for a DHCP server within a subnet, especially when using the OVN driver.
>> While I've come across a blueprint that addresses this topic, I haven't
>> been able to find any pertinent details in the documentation.
>>
>> Our primary use case is to maintain IP addresses during the migration of
>> VMs between two OpenStack clouds.
>>
>> Any guidance or suggestions would be greatly appreciated.
>>
>> Thank you!
>>
>> --
>> Kamil Madac
>>
>

-- 
Kamil Madac <https://kmadac.github.io/>
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