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Chapter 1. Overview of DNSaaS

Red Hat OpenStack Platform includes a Technology Preview of DNS-as-a-Service (DNSaaS), also known as Designate. DNSaaS includes a REST API for domain and record management, is multi-tenanted, and integrates with OpenStack Identity Service (keystone) for authentication. DNSaaS includes a framework for integration with Compute (nova) and OpenStack Networking (neutron) notifications, allowing auto-generated DNS records. In addition, DNSaaS includes integration support for Bind9.

Important

DNS-as-a-Service (DNSaaS), also known as Designate, is available in this release as a Technology Preview, and therefore is not fully supported by Red Hat. If you are interested in running DNSaaS in your production environment, please file a support ticket and mention the bug tracker BZ#1374002, so we can gauge the interest for this tool. For more information about Technology Preview features, see https://access.redhat.com/support/offerings/techpreview.

1.1. Topics covered in this chapter
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  • Manual DNSaaS installation steps, as DNSaaS is not currently included in Director deployment.
  • Managing and configuring DNSaaS from the command line interface.
  • Integration with Bind9, including API usage and auto-creation of instance records.

1.1.1. DNSaaS prerequisites
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  • A fully functioning non-HA OpenStack environment.

1.1.2. DNSaaS services
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A deployment of DNSaaS includes the following components:

Expand

designate-api

Provides an OpenStack-native REST API.

designate-central

Handles requests and coordinates storage in the mysql database.

designate-mdns

A small MiniDNS server used only to communicate with other DNS servers over standard DNS protocol.

designate-pool-manager

Manages the states of the DNS servers that DNSaaS manages. Ensures the backend DNS servers are in sync with DNSaaS.

designate-sink

An optional service that is used to listen to nova and neutron notification events to trigger automatic record creation/deletion.

designate-agent

Used for DNS servers that cannot accept zone transfers (AXFR). Not needed for BIND backends.

DNSaaS record management begins when the designate-sink service sends a message to designate-central, which then triggers the workflow described below:

  1. designate-sink receives an instance boot/delete event from Compute, or a floating IP add/remove event from OpenStack Networking. These events are sent using the OpenStack message bus.
  2. designate-sink constructs the FQDN of the host from the VM name and the configured domain ID (see below).
  3. designate-sink tells designate-central to add/delete the record with the given name and IP address.
  4. designate-central adds/deletes the record in the DNSaaS database (shared between designate-central and designate-mdns).
  5. designate-central tells designate-pool-manager to send a DNS NOTIFY to the backend DNS server (BIND9) for this domain.
  6. The backend DNS servers receive the DNS NOTIFY and send an AXFR (zone transfer) request to designate-mdns.
  7. designate-mdns reads the changes from the database and sends them to the backend DNS servers in the AXFR response.

1.2. Manual DNSaaS installation
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Note

  1. Install the DNSaaS and BIND packages on the controller node. NOTE: You can also an external BIND service; you will need change the variables below accordingly. 

    yum install openstack-designate-api openstack-designate-central openstack-designate-sink openstack-designate-pool-manager openstack-designate-mdns openstack-designate-common python-designate python-designateclient openstack-designate-agent openstack-utils bind bind-utils
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  2. Configure DNS. It is important to define a specific boolean, otherwise you will get AVCs / Access denied in Designate when creating new zones: 

    setsebool named_write_master_zones 1
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  3. Configure ISC BIND to listen in all IP addresses: 

    sed -i -e "s/listen-on port.*/listen-on port 53 { any; };/" /etc/named.conf
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  4. Configure rndc to bind in all IP addresses, accepts only rndc-key key: 

    sed -i '/^options.*/i include "/etc/rndc.key"; controls {     	inet * allow { any; } keys { "rndc-key"; }; };' /etc/named.conf
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  5. Allow queries for local DNS server from all IP addresses: 

    sed -i '/allow-query.*/d' /etc/named.conf
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  6. Configure DNS server to permit new zone creation via rndc: 

    sed -i '/^options.*/a     	allow-new-zones yes;     	allow-query { any; };' /etc/named.conf
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  7. Create rndc initial configuration: 

    rndc-confgen -a
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  8. Permit group named to write in /var/named: 

    chmod g+w /var/named
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  9. Fix rndc key permissions: 

    chgrp named /etc/rndc.key
chmod g+r /etc/rndc.key
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  10. And finally, start the DNS service: 

    systemctl enable named
systemctl start named
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  11. Source your openstackrc file, as the following steps interact with OpenStack services.

  12. To ease the deployment process, this guide relies on a number of variables; you will need to populate the values accordingly: 

    CONTROLLER_IP_ADDRESS=192.168.2.1
ZONE_NAME=testzone.example.com
INTERNAL_NET_NAME=net_internal
INSTANCES_PROJECT_NAME=myinstancesproject
SERVICES_PROJECT_NAME=service
DESIGNATE_PASSWORD=SecureDesignatePassword

EXTERNAL_DNS_SERVER_IP=$CONTROLLER_IP_ADDRESS
EXTERNAL_DNS_SERVER_FQDN=`hostname`
DESIGNATE_VIP_IP=$CONTROLLER_IP_ADDRESS
RABBIT_SERVER_IP=$CONTROLLER_IP_ADDRESS
REDIS_SERVER_IP=$CONTROLLER_IP_ADDRESS
MYSQL_SERVER_IP=$CONTROLLER_IP_ADDRESS
KEYSTONE_SERVER_IP=$CONTROLLER_IP_ADDRESS
DESIGNATE_SERVER_1=$CONTROLLER_IP_ADDRESS
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  13. The following variables will also populate the required IDs that will be used during the install process. 

    SERVICES_TENANT_ID=`openstack project show $SERVICES_PROJECT_NAME -f value -c id`
INSTANCES_TENANT_ID=`openstack project show $INSTANCES_PROJECT_NAME -f value -c id`
DEFAULT_NAMESERVER_ID=$(uuidgen)
DEFAULT_TARGET_ID=$(uuidgen)
INTERNAL_NET_ID=`openstack network show $INTERNAL_NET_NAME -f value -c id`
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  14. Create the backend database: 

    mysql -u root << EOF
CREATE DATABASE designate;
GRANT ALL ON designate.* TO 'designate'@'%' IDENTIFIED BY '$DESIGNATE_PASSWORD';
GRANT ALL ON designate.* TO 'designate'@'localhost' IDENTIFIED BY '$DESIGNATE_PASSWORD';
CREATE DATABASE designate_pool_manager;
GRANT ALL ON designate_pool_manager.* TO 'designate'@'%' IDENTIFIED BY '$DESIGNATE_PASSWORD';
GRANT ALL ON designate_pool_manager.* TO 'designate'@'localhost' IDENTIFIED BY '$DESIGNATE_PASSWORD';
FLUSH PRIVILEGES;
quit
EOF
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  15. Create the DNSaaS service account in keystone: 

    openstack user create designate --password $DESIGNATE_PASSWORD --email designate@localhost
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  16. Add the DNSaaS account to the service project: 

    openstack role add --project $SERVICES_PROJECT_NAME --user designate admin
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  17. Create the DNSaaS service: 

    openstack service create dns --name designate --description "Designate DNS Service"
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  18. Create the DNSaaS endpoint: 

    openstack endpoint create --region RegionOne --publicurl http://$DESIGNATE_VIP_IP:9001 --internalurl http://$DESIGNATE_VIP_IP:9001 --adminurl http://$DESIGNATE_VIP_IP:9001 designate
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  19. Add the keystone token settings to the DNSaaS configuration: 

    crudini --set /etc/designate/designate.conf keystone_authtoken auth_uri http://$KEYSTONE_SERVER_IP:5000/v2.0
crudini --set /etc/designate/designate.conf keystone_authtoken identity_uri http://$KEYSTONE_SERVER_IP:35357/
crudini --set /etc/designate/designate.conf keystone_authtoken admin_tenant_name $SERVICES_PROJECT_NAME
crudini --set /etc/designate/designate.conf keystone_authtoken project_name $SERVICES_PROJECT_NAME
crudini --set /etc/designate/designate.conf keystone_authtoken admin_user designate
crudini --set /etc/designate/designate.conf keystone_authtoken admin_password $DESIGNATE_PASSWORD
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  20. Configure the API extensions for DNSaaS: 

    crudini --set /etc/designate/designate.conf service:api enabled_extensions_v1 "diagnostics, quotas, reports, sync, touch"
crudini --set /etc/designate/designate.conf service:api enabled_extensions_v2 "quotas, reports"
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  21. Configure DNSaaS to integrate with the Instances project: 

    crudini --set /etc/designate/designate.conf service:central managed_resource_tenant_id $INSTANCES_TENANT_ID
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  22. Add the connection to the backend database: 

    crudini --set /etc/designate/designate.conf storage:sqlalchemy connection mysql+pymysql://designate:$DESIGNATE_PASSWORD@$MYSQL_SERVER_IP/designate
crudini --set /etc/designate/designate.conf pool_manager_cache:sqlalchemy connection mysql+pymysql://designate:$DESIGNATE_PASSWORD@$MYSQL_SERVER_IP/designate_pool_manager
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  23. And the Messaging endpoint: 

    crudini --set /etc/designate/designate.conf oslo_messaging_rabbit rabbit_hosts $RABBIT_SERVER_IP:5672
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  24. Populate and prepare the Designate MySQL database: 

    su -s /bin/sh -c "designate-manage database sync" designate
su -s /bin/sh -c "designate-manage pool-manager-cache sync" designate
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  25. Enable and start only the central and api designate services: 

    systemctl enable designate-central designate-api
systemctl start designate-central designate-api
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  26. Create the following file in /etc/designate/pools.yaml. Remember that you need to change the variables EXTERNAL_DNS_SERVER_FQDN, EXTERNAL_DNS_SERVER_IP and DESIGNATE_SERVER_1. There are provisions for additional DNS servers, if needed: 

    - name: default
  description: Default BIND9 Pool

  attributes:
	external: true
  ns_records:
	- hostname: $EXTERNAL_DNS_SERVER_FQDN.
  	priority: 1
#   - hostname: $EXTERNAL_DNS_SERVER_FQDN_2.
# 	priority: 1
  nameservers:
	- host: $EXTERNAL_DNS_SERVER_IP
  	port: 53
#   - host: $EXTERNAL_DNS_SERVER_IP_2
# 	port: 53

  targets:
	- type: bind9
  	description: BIND9 Server 1
  	masters:
    	- host: $DESIGNATE_SERVER_1
      	port: 5354
#   	- host: $DESIGNATE_SERVER_2
#     	port: 5354
#   	- host: $DESIGNATE_SERVER_3
#     	port: 5354
  	options:
    	host: $EXTERNAL_DNS_SERVER_IP
    	port: 53
    	rndc_host: $EXTERNAL_DNS_SERVER_IP
    	rndc_port: 953
    	rndc_key_file: /etc/designate/rndc.key

#   - type: bind9
# 	description: BIND9 Server 2
# 	masters:
#   	- host: $DESIGNATE_SERVER_1
#     	port: 5354
##  	- host: $DESIGNATE_SERVER_2
##    	port: 5354
##  	- host: $DESIGNATE_SERVER_3
##    	port: 5354
# 	options:
#   	host: $EXTERNAL_DNS_SERVER_IP_2
#   	port: 53
#   	rndc_host: $EXTERNAL_DNS_SERVER_IP_2
#   	rndc_port: 953
#   	rndc_key_file: /etc/designate/rndc.key
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  27. Copy the rndc keyfile to /etc/designate: 

    cp -f /etc/rndc.key /etc/designate/rndc.key
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  28. Ensure designate owns it: 

    chown designate:designate /etc/designate/rndc.key
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  29. Load the above YAML file into the DNSaaS runtime configuration: 

    su -s /bin/sh -c "designate-manage pool update" designate
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  30. Start the remaining DNSaaS services: 

    systemctl enable designate-pool-manager designate-mdns designate-sink
systemctl start designate-pool-manager designate-mdns designate-sink
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  31. Create a DNS zone and export the ZONE_ID variable after its creation: 

    ZONE_ID=`openstack zone create --email admin@$ZONE_NAME $ZONE_NAME. -f value -c id`
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  32. Add the UUID of the new zone to the nova and neutron handlers: 

    crudini --set /etc/designate/designate.conf handler:nova_fixed domain_id $ZONE_ID
crudini --set /etc/designate/designate.conf handler:neutron_floatingip domain_id $ZONE_ID
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  33. Restart the DNSaaS services: 

    systemctl restart designate-api designate-central designate-mdns designate-pool-manager designate-sink
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  34. The DNSaaS portion is now fully configured. Next, you will configure neutron integration. Add dns to the list of ML2 drivers. For example: 

    crudini --set /etc/neutron/plugins/ml2/ml2_conf.ini ml2 extension_drivers port_security,dns
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  35. If you want your DNS agent (dnsmasq) to query DNSaaS (it does not by default): 

    crudini --set /etc/neutron/dhcp_agent.ini DEFAULT dnsmasq_dns_servers $EXTERNAL_DNS_SERVER_IP
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  36. Enable DNSaaS integration for neutron: 

    crudini --set /etc/neutron/neutron.conf designate url http://$DESIGNATE_VIP_IP:9001/v2
crudini --set /etc/neutron/neutron.conf designate admin_auth_url http://$DESIGNATE_VIP_IP:35357/v2.0
crudini --set /etc/neutron/neutron.conf designate admin_username designate
crudini --set /etc/neutron/neutron.conf designate admin_password $DESIGNATE_PASSWORD
crudini --set /etc/neutron/neutron.conf designate admin_tenant_name $SERVICES_PROJECT_NAME
crudini --set /etc/neutron/neutron.conf designate allow_reverse_dns_lookup True
crudini --set /etc/neutron/neutron.conf designate ipv4_ptr_zone_prefix_size 24
crudini --set /etc/neutron/neutron.conf designate ipv6_ptr_zone_prefix_size 116
crudini --set /etc/neutron/neutron.conf designate insecure true
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  37. Restart the neutron and nova services: 

    openstack-service restart neutron
openstack-service restart nova
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  38. Configure your neutron network to use DNSaaS: 

    neutron net-update $INTERNAL_NET_ID --dns_domain $ZONE_NAME.
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1.3. Test OpenStack Networking floating IP record creation
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  1. Check that the zone is correctly configured and in an ACTIVE state: 

    $ openstack zone list
+--------------------------------------+-----------------------+---------+------------+--------+--------+
| id                                   | name                  | type    |     serial | status | action |
+--------------------------------------+-----------------------+---------+------------+--------+--------+
| 1bae1c6e-06e6-4a5d-8b03-483875478b73 | testzone.example.com. | PRIMARY | 1523471795 | ACTIVE | NONE   |
+--------------------------------------+-----------------------+---------+------------+--------+--------+
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  2. Enumerate the existing networks to retrieve the UUIDs. These will be used in the later steps. This example uses the internal and external networks: 

    $ openstack network list
+--------------------------------------+----------+--------------------------------------+
| ID                                   | Name     | Subnets                              |
+--------------------------------------+----------+--------------------------------------+
| 0efce5d7-b2ec-4877-b6bb-de339a76c80b | external | d03cdc41-6962-4d3d-bed1-68b0a5f6b93c |
| c020e6a9-f483-48a9-893d-983ae23d248a | internal | b59684af-d4ea-403e-8b14-d3821a46d52f |
+--------------------------------------+----------+--------------------------------------+
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  3. Create a instance named testinstance, using base image named web, flavor m1.small, attached to network internal, with SSH keypair keypair-demo: 

    $ openstack server create --image web --flavor m1.small --nic net-id=c020e6a9-f483-48a9-893d-983ae23d248a --key-name keypair-demo -f value -c id  testinstance
14e1d0da-30bd-4adf-927b-8f54932cbe95
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  4. Confirm that your instance enters the ACTIVE state before proceeding: 

    $ openstack server list
+--------------------------------------+--------------+--------+-----------------------+------------+
| ID                                   | Name         | Status | Networks              | Image Name |
+--------------------------------------+--------------+--------+-----------------------+------------+
| 14e1d0da-30bd-4adf-927b-8f54932cbe95 | testinstance | ACTIVE | interna=192.168.10.12 | web        |
+--------------------------------------+--------------+--------+-----------------------+------------+
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  5. Review the DNSaaS records and confirm that the new instance does not yet have a record: 

    $ openstack recordset list 1bae1c6e-06e6-4a5d-8b03-483875478b73
+--------------------------------------+-----------------------+------+----------------------------------------------------------------------+--------+--------+
| id                                   | name                  | type | records                                                              | status | action |
+--------------------------------------+-----------------------+------+----------------------------------------------------------------------+--------+--------+
| 4092f9f2-4fcb-4097-91bc-c4fa3b0965f9 | testzone.example.com. | NS   | example10-cont1.testzone.example.com.                                | ACTIVE | NONE   |
| c08400a1-2bb1-4f6b-ae90-9f1b3a3dec82 | testzone.example.com. | SOA  | example10-cont1.testzone.example.com. admin.testzone.example.com.    |        |        |
|                                      |                       |      | 1523471795 3531 600 86400 3600                                       | ACTIVE | NONE   |
+--------------------------------------+-----------------------+------+----------------------------------------------------------------------+--------+--------+
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  6. Create a floating IP address in the external network. 

     ----
$ openstack floating ip create -f value -c floating_ip_address 0efce5d7-b2ec-4877-b6bb-de339a76c80b
172.25.250.146
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  7. Attach the floating IP to testinstance: 

    $ openstack server add floating ip 14e1d0da-30bd-4adf-927b-8f54932cbe95 172.25.250.146
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  8. Check DNSaaS records. This example shows an RR entry for testinstance.testzone.example.com, in a PENDING state. 

    $ openstack recordset list 1bae1c6e-06e6-4a5d-8b03-483875478b73
+--------------------------------------+------------------------------------+------+-------------------------------------------------+---------+--------+
| id                                   | name                               | type | records                                         | status  | action |
+--------------------------------------+------------------------------------+------+-------------------------------------------------+---------+--------+
| 4092f9f2-4fcb-4097-91bc-c4fa3b0965f9 | testzone.example.com.              | NS   | example10-cont1.testzone.example.com.           | ACTIVE  | NONE   |
| c08400a1-2bb1-4f6b-ae90-9f1b3a3dec82 | testzone.example.com.              | SOA  | example10-cont1.testzone.example.com.           | PENDING | UPDATE |
|                                      |                                    |      | admin.testzone.example.com. 1523473397 3531 600 |         |        |
|                                      |                                    |      | 86400 3600                                      |         |        |
| 058f6862-cf1b-4da3-9d78-b3a890aff32f | testinstance.testzone.example.com. | A    | 172.25.250.146                                  | PENDING | CREATE |
+--------------------------------------+------------------------------------+------+-------------------------------------------------+---------+--------+
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  9. After a few seconds wait, you can expect the newly-created entry to change to ACTIVE: 

    $ openstack recordset list 1bae1c6e-06e6-4a5d-8b03-483875478b73
+--------------------------------------+------------------------------------+------+-------------------------------------------------+--------+--------+
| id                                   | name                               | type | records                                         | status | action |
+--------------------------------------+------------------------------------+------+-------------------------------------------------+--------+--------+
| 4092f9f2-4fcb-4097-91bc-c4fa3b0965f9 | testzone.example.com.              | NS   | example10-cont1.testzone.example.com.           | ACTIVE | NONE   |
| c08400a1-2bb1-4f6b-ae90-9f1b3a3dec82 | testzone.example.com.              | SOA  | example10-cont1.testzone.example.com.           | ACTIVE | NONE   |
|                                      |                                    |      | admin.testzone.example.com. 1523473397 3531 600 |        |        |
|                                      |                                    |      | 86400 3600                                      |        |        |
| 058f6862-cf1b-4da3-9d78-b3a890aff32f | testinstance.testzone.example.com. | A    | 172.25.250.146                                  | ACTIVE | NONE   |
+--------------------------------------+------------------------------------+------+-------------------------------------------------+--------+--------+
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  10. Use the DNSaaS Designate API to create a manual record. This example creates web.testzone.example.com as an alias to testinstance.testzone.example.com: 

    $ openstack recordset create --records testinstance.testzone.example.com. --type CNAME  1bae1c6e-06e6-4a5d-8b03-483875478b73 web
+-------------+--------------------------------------+
| Field       | Value                                |
+-------------+--------------------------------------+
| action      | CREATE                               |
| created_at  | 2018-04-11T19:05:23.000000           |
| description | None                                 |
| id          | 3f99a737-c1a4-4137-a4a5-26f934e60dfa |
| name        | web.testzone.example.com.            |
| project_id  | 6b34751621f449499569dfb077f5a7ed     |
| records     | testinstance.testzone.example.com.   |
| status      | PENDING                              |
| ttl         | None                                 |
| type        | CNAME                                |
| updated_at  | None                                 |
| version     | 1                                    |
| zone_id     | 1bae1c6e-06e6-4a5d-8b03-483875478b73 |
| zone_name   | testzone.example.com.                |
+-------------+--------------------------------------+
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  11. Check the DNSaaS configuration. It should now contain a record for web.testzone.example.com: 

    [root@example10-cont1 ~(keystone_admin)]# openstack recordset list 1bae1c6e-06e6-4a5d-8b03-483875478b73
+--------------------------------------+------------------------------------+-------+-------------------------------------------------+---------+--------+
| id                                   | name                               | type  | records                                         | status  | action |
+--------------------------------------+------------------------------------+-------+-------------------------------------------------+---------+--------+
| 4092f9f2-4fcb-4097-91bc-c4fa3b0965f9 | testzone.example.com.              | NS    | example10-cont1.testzone.example.com.           | ACTIVE  | NONE   |
| c08400a1-2bb1-4f6b-ae90-9f1b3a3dec82 | testzone.example.com.              | SOA   | example10-cont1.testzone.example.com.           | PENDING | UPDATE |
|                                      |                                    |       | admin.testzone.example.com. 1523473523 3531 600 |         |        |
|                                      |                                    |       | 86400 3600                                      |         |        |
| 058f6862-cf1b-4da3-9d78-b3a890aff32f | testinstance.testzone.example.com. | A     | 172.25.250.146                                  | ACTIVE  | NONE   |
| 3f99a737-c1a4-4137-a4a5-26f934e60dfa | web.testzone.example.com.          | CNAME | testinstance.testzone.example.com.              | PENDING | CREATE |
+--------------------------------------+-------------------------------+-------+----------------------------------------------------------------+--------+
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  12. Run a DNS test, pointing to localhost as the DNS server, as this is where the DNSaaS service actually runs. This example attempts to resolve web.testzone.example.com: 

    $ host web.testzone.example.com. localhost
Using domain server:
Name: localhost
Address: ::1#53
Aliases:

web.testzone.example.com is an alias for testinstance.testzone.example.com.
testinstance.testzone.example.com has address 172.25.250.146
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  13. Check the reverse DNS configuration: 

    $ host 172.25.250.146 localhost
Using domain server:
Name: localhost
Address: ::1#53
Aliases:

146.250.25.172.in-addr.arpa domain name pointer testinstance.testzone.example.com.
    Copy to Clipboard Toggle word wrap

For more information, refer to the OpenStack Designate API V2 client documentation.

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