Merge "Add docs describing classless PTR delegation"
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Zuul
Gerrit Code Review
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@ -588,18 +588,6 @@ When we query any other IP address in `192.0.2.0/24` we get
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Success!
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You can further specify `in-addr.arpa.` zones to chunks of IP
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addresses by using Classless in-addr.arpa. Delegation. See `RFC 2317`_
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for more information.
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.. note::
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The naming scheme of `RFC 2317`_ is currently not supported and
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names such as `24/0.2.0.192.in-addr.arpa.` which include a `/`
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lead to an error. The suggested workaround is to use `-` instead
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of `/`. For more details please see
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https://bugs.launchpad.net/designate/+bug/1880583.
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.. note::
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In BIND9, when creating a new `PTR` we could skip the zone name.
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@ -607,4 +595,184 @@ for more information.
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for the record name ends up as `12.2.0.192.in-addr.arpa.`. In
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Designate, the name of a record MUST be a complete host name.
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Classless IN-Addr.ARPA Delegation
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=================================
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You may want to delegate blocks of IP addresses to projects that do not align
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to subnet boundries. For example, if you wanted to give project "A" three IP
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addresses. To allow project "A" to manage DNS records for those three
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addresses, without delegating a whole subnet zone to project "A", you can use
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classless IN-ADDR.ARPA delegation as described in `RFC 2317`_.
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.. note::
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As discussed in section 4 of `RFC 2317`_, the examples in the RFC use
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'/' in the delegated zones but '-' is recommended.
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Designate will not allow you to use '/' in zone names. You will need
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to use the recommended '-' instead.
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.. _RFC 2317: https://tools.ietf.org/html/rfc2317
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In this example, we will delegate a PTR zone for three IP addresses, from the
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192.0.2.0/24 subnet, to the `Demo` project '9284a20339184a9bb299386c380211c7'.
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.. note::
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Unless noted in the examples, the commands are using a credential with
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an admin role. This is not necessary, but is a typical use case.
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First, the full subnet in-addr.arpa zone will need to be created:
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.. code-block:: console
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$ openstack zone create --email me@example.com 2.0.192.in-addr.arpa.
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+----------------+--------------------------------------+
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| Field | Value |
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+----------------+--------------------------------------+
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| action | CREATE |
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| attributes | |
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| created_at | 2022-09-09T20:05:41.000000 |
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| description | None |
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| email | me@example.com |
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| id | bbdf0e8f-8d73-4659-ae62-f59e95a31cd7 |
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| masters | |
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| name | 2.0.192.in-addr.arpa. |
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| pool_id | 794ccc2c-d751-44fe-b57f-8894c9f5c842 |
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| project_id | cc5ab848dbe7462e9c7603d54a9af90f |
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| serial | 1662753940 |
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| status | PENDING |
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| transferred_at | None |
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| ttl | 3600 |
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| type | PRIMARY |
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| updated_at | None |
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| version | 1 |
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+----------------+--------------------------------------+
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Next we will create the delegated zone:
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.. code-block:: console
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$ openstack zone create --email me@example.com 1-3.2.0.192.in-addr.arpa.
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+----------------+--------------------------------------+
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| Field | Value |
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+----------------+--------------------------------------+
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| action | CREATE |
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| attributes | |
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| created_at | 2022-09-09T20:06:59.000000 |
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| description | None |
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| email | me@example.com |
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| id | 2d353ed7-cb7f-4ff7-9c1e-54481304f4cb |
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| masters | |
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| name | 1-3.2.0.192.in-addr.arpa. |
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| pool_id | 794ccc2c-d751-44fe-b57f-8894c9f5c842 |
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| project_id | cc5ab848dbe7462e9c7603d54a9af90f |
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| serial | 1662754018 |
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| status | PENDING |
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| transferred_at | None |
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| ttl | 3600 |
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| type | PRIMARY |
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| updated_at | None |
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| version | 1 |
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+----------------+--------------------------------------+
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Now we can share the delegated zone with the `Demo` project:
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.. code-block:: console
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$ openstack zone share create 1-3.2.0.192.in-addr.arpa. 9284a20339184a9bb299386c380211c7
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+-------------------+--------------------------------------+
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| Field | Value |
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+-------------------+--------------------------------------+
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| created_at | 2022-09-09T20:07:20.000000 |
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| id | 7859ca43-bcee-4fd1-aa2d-efda17b75198 |
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| project_id | cc5ab848dbe7462e9c7603d54a9af90f |
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| target_project_id | 9284a20339184a9bb299386c380211c7 |
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| updated_at | None |
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| zone_id | 2d353ed7-cb7f-4ff7-9c1e-54481304f4cb |
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+-------------------+--------------------------------------+
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Once we have the zones created and shared, we can now add the CNAME records to
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the full subnet zone that point to the delegated zone records. This will need
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to be repeated for each IP address being delegated. This example creates the
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first CNAME record for the 192.0.2.1 IP address.
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.. code-block:: console
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$ openstack recordset create --record 1.1-3.2.0.192.in-addr.arpa. --type CNAME 2.0.192.in-addr.arpa. 1.2.0.192.in-addr.arpa.
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+-------------+--------------------------------------+
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| Field | Value |
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+-------------+--------------------------------------+
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| action | CREATE |
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| created_at | 2022-09-09T20:09:16.000000 |
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| description | None |
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| id | 482bd367-9815-4d86-a93d-734bbc92499a |
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| name | 1.2.0.192.in-addr.arpa. |
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| project_id | cc5ab848dbe7462e9c7603d54a9af90f |
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| records | 1.1-3.2.0.192.in-addr.arpa. |
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| status | PENDING |
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| ttl | None |
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| type | CNAME |
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| updated_at | None |
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| version | 1 |
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| zone_id | bbdf0e8f-8d73-4659-ae62-f59e95a31cd7 |
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| zone_name | 2.0.192.in-addr.arpa. |
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+-------------+--------------------------------------+
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Finally, members of the `Demo` project can now create the PTR records for the
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delegates IP addresses. In this example the administrator will create the first
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record on behalf of the `Demo` project.
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.. code-block:: console
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$ openstack recordset create --sudo-project-id 9284a20339184a9bb299386c380211c7 --record www.example.com. --type PTR 1-3.2.0.192.in-addr.arpa. 1.1-3.2.0.192.in-addr.arpa.
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+-------------+--------------------------------------+
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| Field | Value |
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+-------------+--------------------------------------+
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| action | CREATE |
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| created_at | 2022-09-09T20:08:17.000000 |
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| description | None |
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| id | cea3f3ce-687b-422c-a378-bdcfe382a159 |
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| name | 1.1-3.2.0.192.in-addr.arpa. |
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| project_id | 9284a20339184a9bb299386c380211c7 |
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| records | www.example.com. |
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| status | PENDING |
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| ttl | None |
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| type | PTR |
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| updated_at | None |
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| version | 1 |
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| zone_id | 2d353ed7-cb7f-4ff7-9c1e-54481304f4cb |
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| zone_name | 1-3.2.0.192.in-addr.arpa. |
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+-------------+--------------------------------------+
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We can now use dig to query a recursive resolver to verify the delegation:
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.. code-block:: console
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$ dig -x 192.0.2.1 @198.51.100.5
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; <<>> DiG 9.16.32-RH <<>> -x 192.0.2.1 @198.51.100.5
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;; global options: +cmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16209
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;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
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;; OPT PSEUDOSECTION:
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; EDNS: version: 0, flags:; udp: 4096
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; COOKIE: a415d9b43dcef11c01000000631ba068973cbfbf5b765032 (good)
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;; QUESTION SECTION:
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;1.2.0.192.in-addr.arpa. IN PTR
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;; ANSWER SECTION:
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1.2.0.192.in-addr.arpa. 3600 IN CNAME 1.1-3.2.0.192.in-addr.arpa.
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1.1-3.2.0.192.in-addr.arpa. 3600 IN PTR www.example.com.
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;; Query time: 0 msec
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;; SERVER: 198.51.100.5#53(198.51.100.5)
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;; WHEN: Fri Sep 09 13:22:00 PDT 2022
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;; MSG SIZE rcvd: 149
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.. note::
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Your resolver or DNS server settings (such as allow recursion and/or
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minimal responses) may cause dig to only display the CNAME and not resolve
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the PTR record in the same request.
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