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[Launchpad Bug Tracker <1557002@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1557002

Title:
  isolated metadata proxy will not be updated when router interface
  add/delete

Status in neutron:
  Expired

Bug description:
  When create/delete router interface, the isolated metadata proxy for
  isolated network will not be updated. It will cause two issues.

  a) The isolated metadata proxy process will still be there, even if no
  subnet will use it. It will waste the resource of host, especially
  when there are many networks.

  Reproduce:
  1) Set "enable_isolated_metadata = True" in configuration.
  2) Create a network.
  3) Create a ipv4 subnet for the network.
  4) Attach the subnet to a router.
  The  isolated metadata proxy process is useless now, but it is still there. Even if I restarted the dhcp-agent, the process will not be killed.

  b) The  isolated metadata proxy process will not be spawned, when a
  subnet becomes isolated.

  Reproduce:
  1) Set "enable_isolated_metadata = True" in configuration.
  2) Create a network.
  3) Create a ipv4 subnet for the network.
  4) Attach the subnet to a router.
  5) Update the network with "neutron net-update test-net --admin_state_up False" The isolated metadata proxy should be killed now.
  6) Update the network with "neutron net-update test-net --admin_state_up True"
  7) Detach the subnet from the router. The subnet becomes isolated, but the  isolated metadata proxy process will not be spawned. And the isolated metadata service can be used.

  Bug [1] introduced a way to update the network on dhcp agent when
  create/delete router interface. The fix can be based on that bug, to
  update the metadata proxy process according to the change of router
  interface.

  [1] https://bugs.launchpad.net/neutron/+bug/1554825

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