Update dns_assignment attribute documentation
After the implementation of [1], the calculation of the port's dns_assignment attribute changed for some use cases of the Neutron integration with an external DNS service. This change updates the documentation accordingly [1] https://specs.openstack.org/openstack/neutron-specs/specs/victoria/port_dns_assignment.html Partial-Bug: #1956632 Change-Id: I1c8c6850faa7741afabe31889cdad0228a366310
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Miguel Lavalle
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@ -927,3 +927,85 @@ meet the following requirements:
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This usually implies that these use cases only work for networks specifically
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created for this purpose by an admin, they do not work for networks
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which tenants can create on their own.
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.. _config-dns-int-ext-dns-assignment:
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The port's ``dns_assignment`` attribute with use case 3
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-------------------------------------------------------
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The ``dns_assignment`` attribute is not calculated as described in
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:ref:`config-dns-int` when a port is created under use case 3. Instead of
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concatenating the port's ``dns_name`` with the value configured
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in the ``dns_domain`` parameter in ``neutron.conf``, the ``dns_name`` is
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concatenated with the ``dns_domain`` of either the port or the network,
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depending on whether the use case is 3a, 3b or 3c. For example:
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.. code-block:: console
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$ openstack network show external -c dns_domain -f value
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dns-domain-1.org.
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$ cat /etc/neutron/neutron.conf | grep dns_domain
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dns_domain = my-domain.org
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$ openstack recordset list dns-domain-1.org.
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+--------------------------------------+-------------------+------+-----------------------------------------------------------------------+--------+--------+
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| id | name | type | records | status | action |
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+--------------------------------------+-------------------+------+-----------------------------------------------------------------------+--------+--------+
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| 2b3e9ea4-8035-4595-955d-ec8c55816111 | dns-domain-1.org. | SOA | ns1.devstack.org. mlavalle.redhat.com. 1642583355 3517 600 86400 3600 | ACTIVE | NONE |
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| 801dd911-43e6-430a-a80b-ea09af76a9a4 | dns-domain-1.org. | NS | ns1.devstack.org. | ACTIVE | NONE |
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+--------------------------------------+-------------------+------+-----------------------------------------------------------------------+--------+--------+
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$ openstack port create --dns-name a-port --network external a_port
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+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Field | Value |
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+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| admin_state_up | UP |
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| allowed_address_pairs | |
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| binding_host_id | None |
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| binding_profile | None |
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| binding_vif_details | None |
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| binding_vif_type | None |
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| binding_vnic_type | normal |
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| created_at | 2022-01-19T09:15:34Z |
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| data_plane_status | None |
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| description | |
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| device_id | |
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| device_owner | |
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| device_profile | None |
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| dns_assignment | fqdn='a-port.dns-domain-1.org.', hostname='a-port', ip_address='172.31.251.113' |
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| | fqdn='a-port.dns-domain-1.org.', hostname='a-port', ip_address='fd5e:7a6b:1a62::a3' |
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| dns_domain | |
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| dns_name | a-port |
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| extra_dhcp_opts | |
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| fixed_ips | ip_address='172.31.251.113', subnet_id='6795a775-4a76-49b0-bac6-ba8a8b62bd22' |
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| | ip_address='fd5e:7a6b:1a62::a3', subnet_id='97b719f8-2307-4162-bf08-523d9c0fc6a9' |
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| id | 080f01e7-78b9-43ed-a807-1e0d59099bed |
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| ip_allocation | None |
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| location | Munch({'cloud': '', 'region_name': 'RegionOne', 'zone': None, 'project': Munch({'id': 'afc55714081b4ef29f99ec128cb1fa30', 'name': 'demo', 'domain_id': 'default', 'domain_name': None})}) |
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| mac_address | fa:16:3e:4d:fa:33 |
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| name | a_port |
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| network_id | 2d696f10-97a4-454c-a411-ea8d4d685636 |
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| numa_affinity_policy | None |
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| port_security_enabled | True |
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| project_id | afc55714081b4ef29f99ec128cb1fa30 |
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| propagate_uplink_status | None |
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| qos_network_policy_id | None |
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| qos_policy_id | None |
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| resource_request | None |
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| revision_number | 1 |
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| security_group_ids | 1a350403-cad3-4a2d-b30a-73815bd96e0f |
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| status | DOWN |
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| tags | |
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| trunk_details | None |
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| updated_at | 2022-01-19T09:15:34Z |
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+-------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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$ openstack recordset list dns-domain-1.org.
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+--------------------------------------+--------------------------+------+-----------------------------------------------------------------------+--------+--------+
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| id | name | type | records | status | action |
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+--------------------------------------+--------------------------+------+-----------------------------------------------------------------------+--------+--------+
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| 2b3e9ea4-8035-4595-955d-ec8c55816111 | dns-domain-1.org. | SOA | ns1.devstack.org. mlavalle.redhat.com. 1642583736 3517 600 86400 3600 | ACTIVE | NONE |
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| 801dd911-43e6-430a-a80b-ea09af76a9a4 | dns-domain-1.org. | NS | ns1.devstack.org. | ACTIVE | NONE |
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| 61597628-dafe-4aba-8e30-1d45b4e59874 | a-port.dns-domain-1.org. | AAAA | fd5e:7a6b:1a62::a3 | ACTIVE | NONE |
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| 83fe489f-2ebc-4911-a67e-bef688833f31 | a-port.dns-domain-1.org. | A | 172.31.251.113 | ACTIVE | NONE |
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+--------------------------------------+--------------------------+------+-----------------------------------------------------------------------+--------+--------+
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In this manner, the ``FQDN`` in the ``dns_assignment`` attribute is compatible
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with what is being published by the external DNS service.
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@ -235,3 +235,9 @@ In the above example notice that:
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must be equal to the value that Compute service will assign to the instance's
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``hostname``, in this example ``my-vm``. Otherwise, the instance boot will
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fail.
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.. note::
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When the Networking service integration with an external DNS service is
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enabled, a port's FQDN in the ``dns_assignment`` attribute will not be
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calculated as described above in some well defined cases. For a description
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of these cases please see :ref:`config-dns-int-ext-dns-assignment`.
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