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[Andrew Melton <andrew.melton@xxxxxxxxxxxxx>]

Public bug reported:

Shutting down a libvirt-lxc based instance will leak the nbd device.
This happens because _teardown_container will only be called when
libvirt domain's are running. During a shutdown, the domain is not
running at the time of the destroy. Thus, _teardown_container is never
called and the nbd device is never disconnected.

Steps to reproduce:
1) Create devstack using local.conf: https://gist.github.com/ramielrowe/6ae233dc2c2cd479498a
2) Create an instance
3) Perform ps ax |grep nbd on devstack host. Observe connected nbd device
4) Shutdown instance
5) Perform ps ax |grep nbd on devstack host. Observe connected nbd device
6) Delete instance
7) Perform ps ax |grep nbd on devstack host. Observe connected nbd device

Nova has now leaked the nbd device.

** Affects: nova
     Importance: Undecided
     Assignee: Andrew Melton (andrew-melton)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Andrew Melton (andrew-melton)

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https://bugs.launchpad.net/bugs/1367363

Title:
  Libvirt-lxc will leak nbd devices on instance shutdown

Status in OpenStack Compute (Nova):
  New

Bug description:
  Shutting down a libvirt-lxc based instance will leak the nbd device.
  This happens because _teardown_container will only be called when
  libvirt domain's are running. During a shutdown, the domain is not
  running at the time of the destroy. Thus, _teardown_container is never
  called and the nbd device is never disconnected.

  Steps to reproduce:
  1) Create devstack using local.conf: https://gist.github.com/ramielrowe/6ae233dc2c2cd479498a
  2) Create an instance
  3) Perform ps ax |grep nbd on devstack host. Observe connected nbd device
  4) Shutdown instance
  5) Perform ps ax |grep nbd on devstack host. Observe connected nbd device
  6) Delete instance
  7) Perform ps ax |grep nbd on devstack host. Observe connected nbd device

  Nova has now leaked the nbd device.

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