yahoo-eng-team team mailing list archive

[Billy Olsen <1993628@xxxxxxxxxxxxxxxxxx>]

Agree that this likely isn’t a charm issue. I’ll mark invalid for now,
but feel free to reopen if evidence suggests otherwise.

** Changed in: charm-designate
       Status: New => Invalid

** Changed in: charm-designate
       Status: Invalid => Incomplete

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1993628

Title:
  Designate synchronisation inconsistensies with Neutron-API

Status in OpenStack Designate Charm:
  Incomplete
Status in neutron:
  New

Bug description:
  When setting a network to use automatically a dns-domain, some
  inconsistensies were observed when deleting and recreating new
  instances sharing the same names and associating them to the same
  floating IPs from before.

  This has been reproduced on :
  * Focal Ussuri (Neutron-api and Designate charms with Ussuri/edge branch)
  * Focal Yoga  (Neutron-api and Designate charms with Yoga/stable branch)

  
  Reproducible steps :
  * create a domain zone with "openstack zone create"
  * configure an existing self-service with the newly created domain "openstack network set --dns-domain ..."
  * create a router on the self-service network with an external gateway on provider network
  * create an instance on self-service network
  * create a floating ip address on provider network
  * associate floating ip to instance
  --> the DNS entry gets created

  * delete the instance *WITH* the floating ip still attached
  --> the DNS entry is deleted

  * recreate a new instance with exactly the *same* name and re-use the *same* floating ip
  --> the DNS entry doesn't get created
  --> it doesn't seem to be related to TTL, since this makes the issue permanent even after a day of testing when TTL is set by default to 1 hour

  Worse inconsistensies can be seen when, instead of deleting an instance, moving the floating ip directly to another instance
  * have 2 instances vm-1 and vm-2
  * attach floating ip to vm-1 "openstack server add floating ip XXX vm-1"
  --> the DNS entry is created
  * attach the same floating ip to vm-2 ""openstack server add floating ip XXX vm-2"  (this is permitted by CLI and simply move the fIP to vm-2)
  --> the DNS entry still use vm-1, vm-2 doesn't get created

  When you combine these 2 issues, you can be left with either false
  records being kept or automatic records failing silently to be
  created.

  
  Workaround :
  * either always remove floating ip *before* deleting an instance
  or
  * remove floating ip on instance
  * then re-add floating ip on instance

  
  Eventually when deleting the floating ip to reassign it, we are gratified with this error on neutron-api unit (on Ussuri but the error is similar on Yoga) :

  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db [req-e6d270d2-fbde-42d7-a75b-2c8a67c42fcb 2dc4151f6dba4c3e8ba8537c9c354c13 f548268d5255424591baa8783f1cf277 - 6a71047e7d7f4e01945ec58df06ae63f 6a71047e7d7f4e01945ec58df06ae63f] Error deleting Floating IP data from external DNS service. Name: 'vm-2'. Domain: 'compute.stack.vpn.'. IP addresses '192.168.21.217'. DNS service driver message 'Name vm-2.compute.stack.vpn. is duplicated in the external DNS service': neutron_lib.exceptions.dns.DuplicateRecordSet: Name vm-2.compute.stack.vpn. is duplicated in the external DNS service
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db Traceback (most recent call last):
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db   File "/usr/lib/python3/dist-packages/neutron/db/dns_db.py", line 214, in _delete_floatingip_from_external_dns_service
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db     self.dns_driver.delete_record_set(context, dns_domain, dns_name,
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db   File "/usr/lib/python3/dist-packages/neutron/services/externaldns/drivers/designate/driver.py", line 172, in delete_record_set
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db     ids_to_delete = self._get_ids_ips_to_delete(
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db   File "/usr/lib/python3/dist-packages/neutron/services/externaldns/drivers/designate/driver.py", line 200, in _get_ids_ips_to_delete
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db     raise dns_exc.DuplicateRecordSet(dns_name=name)
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db neutron_lib.exceptions.dns.DuplicateRecordSet: Name vm-2.compute.stack.vpn. is duplicated in the external DNS service
  2022-10-19 02:24:12.497 67548 ERROR neutron.db.dns_db

To manage notifications about this bug go to:
https://bugs.launchpad.net/charm-designate/+bug/1993628/+subscriptions