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IIRC, when you disable dhcp on the network, modern cloud-init (like debian 12/Ubuntu 22.04) will configure the IP on your instance at boot time after doing a metadata network request.

That just works, but it depends on OS.
Cheers,
Arnaud

Le 11 août 2023 04:43:42 GMT+02:00, "Nguyễn Hữu Khôi" <nguyenhuukhoinw at gmail.com> a écrit :
>Yes. I agree with you but when all controller is down and some users need
>to reboot their instances then it won't have ip. This is my worry.
>
>Nguyen Huu Khoi
>
>
>On Fri, Aug 11, 2023 at 5:00 AM Clark Boylan <cboylan at sapwetik.org> wrote:
>
>> On Thu, Aug 10, 2023, at 12:00 AM, Nguyễn Hữu Khôi wrote:
>> > Hello guys.
>> >
>> > Sometimes I see that my instances won't get IP from Neutron DHCP Agent.
>> >
>> > Is it good if we set a fixed port for instance and set a static ip in
>> > the instance's netplan configuration also?
>>
>> We do this for IPv6 addresses on some of our servers as we've had problems
>> with RAs. It seems to work fine in that case. Ideally, this shouldn't be
>> necessary for any cloud instance though and it might be worth digging into
>> why dhcp isn't working so that it can be corrected.
>>
>> >
>> >
>> > Nguyen Huu Khoi
>>
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