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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: quantum
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1104337

Title:
  Deleting a subnet that is added to a router leaves behind a port that
  cannot be deleted

Status in OpenStack Quantum (virtual network service):
  Fix Released
Status in quantum folsom series:
  Fix Committed

Bug description:
  When adding a subnet to a router via router-interface-add, it is
  possible to delete the subnet without removing the interface. This
  leaves a port behind that cannot be deleted because it is part of a
  router, and a router that cannot be deleted because it has an active
  port. It is possible to delete the port via running a network-delete,
  but one shouldn't have to delete the entire network just to fix the
  issue.

  I'm attaching a patch that deletes ports marked as
  AUTO_DELETE_PORT_OWNERS when deleting the subnet (the same thing that
  happens if we cascade deleting by deleting a network) instead of just
  deleting the IPAllocation.

  Example of issue:
  [terry@f17-devstack1 quantum]$ quantum net-create net1
  Created a new network:
  +---------------------------+--------------------------------------+
  | Field                     | Value                                |
  +---------------------------+--------------------------------------+
  | admin_state_up            | True                                 |
  | id                        | ee4e9eae-f51d-442d-84c0-d81b6e1ba69e |
  | name                      | net1                                 |
  | provider:network_type     | vlan                                 |
  | provider:physical_network | physnet1                             |
  | provider:segmentation_id  | 1                                    |
  | router:external           | False                                |
  | shared                    | False                                |
  | status                    | ACTIVE                               |
  | subnets                   |                                      |
  | tenant_id                 | 2e3986dd9ea643f4949223283299ddec     |
  +---------------------------+--------------------------------------+
  [terry@f17-devstack1 quantum]$ quantum subnet-create net1 10.10.10.0/24 --name subnet1
  Created a new subnet:
  +------------------+------------------------------------------------+
  | Field            | Value                                          |
  +------------------+------------------------------------------------+
  | allocation_pools | {"start": "10.10.10.2", "end": "10.10.10.254"} |
  | cidr             | 10.10.10.0/24                                  |
  | dns_nameservers  |                                                |
  | enable_dhcp      | True                                           |
  | gateway_ip       | 10.10.10.1                                     |
  | host_routes      |                                                |
  | id               | 02eb6689-04b0-4617-8bf9-10fddc2fa591           |
  | ip_version       | 4                                              |
  | name             | subnet1                                        |
  | network_id       | ee4e9eae-f51d-442d-84c0-d81b6e1ba69e           |
  | tenant_id        | 2e3986dd9ea643f4949223283299ddec               |
  +------------------+------------------------------------------------+
  [terry@f17-devstack1 quantum]$ quantum router-create router1
  Created a new router:
  +-----------------------+--------------------------------------+
  | Field                 | Value                                |
  +-----------------------+--------------------------------------+
  | admin_state_up        | True                                 |
  | external_gateway_info |                                      |
  | id                    | f13fca0d-6ba9-4b9d-a842-e34dedbede2b |
  | name                  | router1                              |
  | status                | ACTIVE                               |
  | tenant_id             | 2e3986dd9ea643f4949223283299ddec     |
  +-----------------------+--------------------------------------+
  [terry@f17-devstack1 quantum]$ quantum router-interface-add router1 subnet1
  Added interface to router router1
  [terry@f17-devstack1 quantum]$ quantum port-list
  +--------------------------------------+------+-------------------+-----------------------------------------------------------------------------------+
  | id                                   | name | mac_address       | fixed_ips                                                                         |
  +--------------------------------------+------+-------------------+-----------------------------------------------------------------------------------+
  | 2486674a-8ce7-42ae-8b36-1a41d4a54606 |      | fa:16:3e:7d:fe:66 | {"subnet_id": "02eb6689-04b0-4617-8bf9-10fddc2fa591", "ip_address": "10.10.10.1"} |
  +--------------------------------------+------+-------------------+-----------------------------------------------------------------------------------+
  [terry@f17-devstack1 quantum]$ quantum subnet-delete subnet1
  Deleted subnet: subnet1
  [terry@f17-devstack1 quantum]$ quantum port-list
  +--------------------------------------+------+-------------------+-----------+
  | id                                   | name | mac_address       | fixed_ips |
  +--------------------------------------+------+-------------------+-----------+
  | 2486674a-8ce7-42ae-8b36-1a41d4a54606 |      | fa:16:3e:7d:fe:66 |           |
  +--------------------------------------+------+-------------------+-----------+
  [terry@f17-devstack1 quantum]$ quantum port-delete 2486674a-8ce7-42ae-8b36-1a41d4a54606
  Port 2486674a-8ce7-42ae-8b36-1a41d4a54606 has owner network:router_interface and therefore cannot be deleted directly via the port API.
  [terry@f17-devstack1 quantum]$ quantum router-delete router1
  Router f13fca0d-6ba9-4b9d-a842-e34dedbede2b still has active ports
  [terry@f17-devstack1 quantum]$ quantum router-interface-delete router1 02eb6689-04b0-4617-8bf9-10fddc2fa591
  Unable to find subnet with name '02eb6689-04b0-4617-8bf9-10fddc2fa591'

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