[neutron] set/find dhcp-server address

Volodymyr Litovka doka.ua at gmx.com
Sat May 25 20:19:32 UTC 2019


it seems I wasn't first who asked for this -
and it seems there was no progress on this?

Is it possible to at least include DHCP address in output of 'subnet
show' API call?

The shortest way I've found is:
* openstack port list --project ... --device-owner network:dhcp
and then for **every port** in resulting list
* openstack port show
in order to extract 'Fixed IP Addresses' attribute for analysis

Too much calls, isn't it?

On 5/25/19 9:22 PM, Volodymyr Litovka wrote:
> Dear colleagues,
> is there way to explicitly assign DHCP address when creating subnet?
> The issue is that it isn't always first address from allocation pool, e.g.
> $ openstack port list
> +--------------------------------------+-------+-------------------+------------------------------------------------------------------------------+--------+
> | ID                                   | Name  | MAC Address       | Fixed IP Addresses                                                           | Status |
> +--------------------------------------+-------+-------------------+------------------------------------------------------------------------------+--------+
> | 0897bcc4-6cad-479c-8743-ca7cc5a57271 |       | 72:d0:1c:d1:6b:51 | ip_address='', subnet_id='20329549-124c-484d-8278-edca9829e262'   | ACTIVE |
> |                                      |       |                   | ip_address='', subnet_id='07249cd3-11a9-4da7-a4db-bd838aa8c4e7'   |        |
> both subnet have similar configuration of allocation pool
> (172.16.xx.2-254/24) and there are two different addresses for DHCP in
> every subnet.
> This makes a trouble during project generation with pre-assigned
> addresses for servers if the pre-assigned address is same as
> [surprisigly, non-first] address of DHCP namespace.
> And, may be, there is a way to determine this address in more simple
> way than looking into 'openstack port list' output, searching for port
> (a) without name and (b) with multiple addresses from all belonging
> subnets :) At the moment, 'openstack subnet show' say nothing about
> assigned DHCP-address.
> Thank you!
> --
> Volodymyr Litovka
>    "Vision without Execution is Hallucination." -- Thomas Edison

Volodymyr Litovka
   "Vision without Execution is Hallucination." -- Thomas Edison

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