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This seems to be the spec from Mitaka - the code with None dates from 6
years ago.

https://specs.openstack.org/openstack/nova-specs/specs/mitaka/approved/virt-device-role-tagging.html

I think my comprehension is wrong, but the intent is around exposing non
regular devices (VF, PCI drives). I don't have a way to try that in my lab,
so I'll need to check elsewhere.

On Tue, Apr 5, 2022 at 8:37 PM Laurent Dumont <laurentfdumont at gmail.com>
wrote:

> After adding some POTATO debugs, it seems that meta_data generation does
> not actually happen for the instances I have tested.
>
>         vif_vfs_trusted_supported = self._check_os_version(ROCKY, version)
>         *LOG.info('POTATO -3 CHECKING IF WE HAVE DEVICE_METADATA|
> '+str(self.instance.device_metadata))*
>         if self.instance.device_metadata is not None:
>             *LOG.info('device_metadata is not None|
> '+str(self.instance.device_metadata))*
>             for device in self.instance.device_metadata.devices:
>                 device_metadata = {}
>                 bus = 'none'
>
> In my logs
> 2022-04-06 00:33:08.541 30 INFO nova.api.metadata.base
> [req-15612a39-649f-4598-b588-ebcceedd49b1 - - - - -] POTATO -3 CHECKING IF
> WE HAVE DEVICE_METADATA| None
>
> device_metadata = None so the condition is False so it skips all that
> code. It seems a bit strange, since None would mean there is nothing so
> let's add some data?
>
> I am not clear on how self.instance.device_metadata is expected to behave.
> I'll have to dig a little deeper.
>
> On Tue, Apr 5, 2022 at 7:58 PM Laurent Dumont <laurentfdumont at gmail.com>
> wrote:
>
>> Trying to trace the code that I dont fully grasp :D
>>
>> We start in nova/base.py
>>
>> https://github.com/openstack/nova/blob/stable/ussuri/nova/api/metadata/base.py
>>
>> We seem to generate a device array with a bunch of stuff inside
>>
>>         if self._check_os_version(NEWTON_ONE, version):
>>             metadata['devices'] = self._get_device_metadata(version)
>>
>> (but only if the version is higher than NEWTON_ONE? I dont think we
>> generate the file every single time someone calls the API so it's probably
>> at VM creation only?)
>>
>> Looking at the code for _get_device_metadata
>>
>>
>> https://github.com/openstack/nova/blob/184a3c976faed38907af148a533bc6e9faa410f5/nova/api/metadata/base.py#L367
>>
>> It seems we try to build an array for Metadata specifically. It's not
>> expected to be a full list of all the actual devices (ports + disks).
>>
>> I'll see if I add a tag to a port, does it now show up?
>>
>> On Tue, Apr 5, 2022 at 7:29 PM Laurent Dumont <laurentfdumont at gmail.com>
>> wrote:
>>
>>> Circling back on this, I see the same in my kolla-ansible + Ussuri.
>>>
>>> {"uuid": "a916a95d-3f9b-4e5e-9f64-894470742d8b", "hostname":
>>> "test-laurent.novalocal", "name": "test-laurent", "launch_index": 0,
>>> "availability_zone": "nova", "random_seed":
>>> "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",
>>> "project_id": "4db7dbf9961c4fc6a4589a5cb2ae3c9a", "devices": []}#
>>>
>>> Nothing in Devices
>>>
>>> But I see it in the network endpoint
>>>
>>> # curl http://169.254.169.254/openstack/2018-08-27/network_data.json
>>> {"links": [{"id": "tap1b4490ec-76", "vif_id":
>>> "1b4490ec-76b9-4223-9a31-837d60b13cc2", "type": "ovs", "mtu": 1450,
>>> "ethernet_mac_address": "fa:16:3e:58:a4:4a"}], "networks": [{"id":
>>> "network0", "type": "ipv4_dhcp", "link": "tap1b4490ec-76", "network_id":
>>> "bef77274-defd-463c-814a-5051ea2acae0"}], "services": []}#
>>>
>>> I'll look at the code, but I am not clear where that snippet is
>>> being generated. It could be expected that the devices array is empty.
>>>
>>> On Sun, Mar 20, 2022 at 11:11 AM Ahmed Abdelhamid <
>>> ahmedabdelhamid1221 at gmail.com> wrote:
>>>
>>>> Thanks. It's OpenStack ussuri, deployed via kolla-ansible
>>>>
>>>> On Fri, Mar 18, 2022 at 10:06 PM Laurent Dumont <
>>>> laurentfdumont at gmail.com> wrote:
>>>>
>>>>> That is weird.
>>>>>
>>>>>    - What version of Openstack are you running?
>>>>>    - How was it deployed?
>>>>>
>>>>>
>>>>> On Fri, Mar 18, 2022 at 9:30 AM Ahmed Abdelhamid <
>>>>> ahmedabdelhamid1221 at gmail.com> wrote:
>>>>>
>>>>>> Thanks, Laurent. I tried it for both CEPH-backed VMs and ones with
>>>>>> local disk, still, the devices array is empty
>>>>>>
>>>>>> Network data curl shows alright
>>>>>>
>>>>>> {"links": [{"id": "tapa.....", "vif_id": "ae....", "type": "bridge",
>>>>>> "mtu": 1500, "ethernet_mac_address": "fa:......."}], "networks": [{"id":
>>>>>> "network0", "type": "ipv4_dhcp", "link": "tap.....
>>>>>>
>>>>>> On Wed, Mar 16, 2022 at 6:39 PM Laurent Dumont <
>>>>>> laurentfdumont at gmail.com> wrote:
>>>>>>
>>>>>>> Are you getting anything from the neutron endpoint?
>>>>>>>
>>>>>>> http://169.254.169.254/openstack/2018-08-27/network_data.json
>>>>>>>
>>>>>>> Can you provide an "openstack server show $server_id" of the VM? I
>>>>>>> wonder if it's a case of boot from a volume VM missing that data. It would
>>>>>>> not explain why the port is not there though.
>>>>>>>
>>>>>>> On Tue, Mar 15, 2022 at 9:15 AM Ahmed Abdelhamid <
>>>>>>> ahmedabdelhamid1221 at gmail.com> wrote:
>>>>>>>
>>>>>>>> Hi All,
>>>>>>>>
>>>>>>>> I am running into a strange issue with the metadata service. Per metadata-service
>>>>>>>> manual <https://docs.openstack.org/nova/latest/user/metadata.html>,
>>>>>>>> the devices attached to a VM should be visible in
>>>>>>>>
>>>>>>>> $ curl http://169.254.169.254/openstack/2018-08-27/meta_data.json
>>>>>>>>
>>>>>>>> However, whenever i execute it from a VM , the devices array is
>>>>>>>> empty and looks like this, any idea why ?
>>>>>>>>
>>>>>>>> Thanks
>>>>>>>>
>>>>>>>> {   "random_seed": "yu5ZnkqF2CqnDZVAfZgarG...",   "availability_zone": "nova",   "keys": [       {         "data": "ssh-rsa AAAAB3NzaC1y...== Generated by Nova\n",         "type": "ssh",         "name": "mykey"       }   ],   "hostname": "test.novalocal",   "launch_index": 0,   "meta": {      "priority": "low",      "role": "webserver"   },   "devices": [ ],   "project_id": "f7ac731cc11f40efbc03a9f9e1d1d21f",   "public_keys": {       "mykey": "ssh-rsa AAAAB3NzaC1y...== Generated by Nova\n"   },   "name": "test"}
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
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