[Openstack-mentoring] Neutron subnet with DHCP relay - continued

Thomas King thomas.king at gmail.com
Tue Aug 4 19:41:48 UTC 2020

Changing the ml2 flat_networks from specific physical networks to a
wildcard allowed me to create a segment. I may be unstuck.

New config:

Now to try creating the subnet and try a remote provision.

Tom King

On Mon, Aug 3, 2020 at 3:58 PM Thomas King <thomas.king at gmail.com> wrote:

> I've been using named physical networks so long, I completely forgot using
> wildcards!
> Is this the answer????
> https://docs.openstack.org/mitaka/config-reference/networking/networking_options_reference.html#modular-layer-2-ml2-flat-type-configuration-options
> Tom King
> On Tue, Jul 28, 2020 at 3:46 PM Thomas King <thomas.king at gmail.com> wrote:
>> Ruslanas has been a tremendous help. To catch up the discussion lists...
>> 1. I enabled Neutron segments.
>> 2. I renamed the existing segments for each network so they'll make
>> sense.
>> 3. I attempted to create a segment for a remote subnet (it is using DHCP
>> relay) and this was the error that is blocking me. This is where the docs
>> do not cover:
>> [root at sea-maas-controller ~(keystone_admin)]# openstack network segment
>> create --physical-network remote146-30-32 --network-type flat --network
>> baremetal seg-remote-146-30-32
>> BadRequestException: 400: Client Error for url:
>>, Invalid input for operation:
>> physical_network 'remote146-30-32' unknown for flat provider network.
>> I've asked Ruslanas to clarify how their physical networks correspond to
>> their remote networks. They have a single provider network and multiple
>> segments tied to multiple physical networks.
>> However, if anyone can shine some light on this, I would greatly
>> appreciate it. How should neutron's configurations accommodate remote
>> networks<->Neutron segments when I have only one physical network
>> attachment for provisioning?
>> Thanks!
>> Tom King
>> On Wed, Jul 15, 2020 at 3:33 PM Thomas King <thomas.king at gmail.com>
>> wrote:
>>> That helps a lot, thank you!
>>> "I use only one network..."
>>> This bit seems to go completely against the Neutron segments
>>> documentation. When you have access, please let me know if Triple-O is
>>> using segments or some other method.
>>> I greatly appreciate this, this is a tremendous help.
>>> Tom King
>>> On Wed, Jul 15, 2020 at 1:07 PM Ruslanas Gžibovskis <ruslanas at lpic.lt>
>>> wrote:
>>>> Hi Thomas,
>>>> I have a bit complicated setup from tripleo side :) I use only one
>>>> network (only ControlPlane). thanks to Harold, he helped to make it work
>>>> for me.
>>>> Yes, as written in the tripleo docs for leaf networks, it use the same
>>>> neutron network, different subnets. so neutron network is ctlplane (I
>>>> think) and have ctlplane-subnet, remote-provision and remote-KI :)) that
>>>> generates additional lines in "ip r s" output for routing "foreign" subnets
>>>> through correct gw, if you would have isolated networks, by vlans and ports
>>>> this would apply for each subnet different gw... I believe you
>>>> know/understand that part.
>>>> remote* subnets have dhcp-relay setup by network team... do not ask
>>>> details for that. I do not know how to, but can ask :)
>>>> in undercloud/tripleo i have 2 dhcp servers, one is for introspection,
>>>> another for provide/cleanup and deployment process.
>>>> all of those subnets have organization level tagged networks and are
>>>> tagged on network devices, but they are untagged on provisioning
>>>> interfaces/ports, as in general pxe should be untagged, but some nic's can
>>>> do vlan untag on nic/bios level. but who cares!?
>>>> I just did a brief check on your first post, I think I have simmilar
>>>> setup to yours :)) I will check in around 12hours :)) more deaply, as will
>>>> be at work :)))
>>>> P.S. sorry for wrong terms, I am bad at naming.
>>>> On Wed, 15 Jul 2020, 21:13 Thomas King, <thomas.king at gmail.com> wrote:
>>>>> Ruslanas, that would be excellent!
>>>>> I will reply to you directly for details later unless the maillist
>>>>> would like the full thread.
>>>>> Some preliminary questions:
>>>>>    - Do you have a separate physical interface for the segment(s)
>>>>>    used for your remote subnets?
>>>>>    The docs state each segment must have a unique physical network
>>>>>    name, which suggests a separate physical interface for each segment unless
>>>>>    I'm misunderstanding something.
>>>>>    - Are your provisioning segments all on the same Neutron network?
>>>>>    - Are you using tagged switchports or access switchports to your
>>>>>    Ironic server(s)?
>>>>> Thanks,
>>>>> Tom King
>>>>> On Wed, Jul 15, 2020 at 12:26 AM Ruslanas Gžibovskis <ruslanas at lpic.lt>
>>>>> wrote:
>>>>>> I have deployed that with tripleO, but now we are recabling and
>>>>>> redeploying it. So once I have it running I can share my configs, just name
>>>>>> which you want :)
>>>>>> On Tue, 14 Jul 2020 at 18:40, Thomas King <thomas.king at gmail.com>
>>>>>> wrote:
>>>>>>> I have. That's the Triple-O docs and they don't go through the
>>>>>>> normal .conf files to explain how it works outside of Triple-O. It has some
>>>>>>> ideas but no running configurations.
>>>>>>> Tom King
>>>>>>> On Tue, Jul 14, 2020 at 3:01 AM Ruslanas Gžibovskis <
>>>>>>> ruslanas at lpic.lt> wrote:
>>>>>>>> hi, have you checked:
>>>>>>>> https://docs.openstack.org/project-deploy-guide/tripleo-docs/latest/features/routed_spine_leaf_network.html
>>>>>>>>  ?
>>>>>>>> I am following this link. I only have one network, having different
>>>>>>>> issues tho ;)
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