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[Silvan Kaiser <silvan@xxxxxxxxxxx>]

Public bug reported:

When running an instance from an image in a Cinder Quobyte volume issues
arise when the corresponding Nova service (openstack-nova-compute) is
restarted or stopped while the instance is active. systemd sigterms the
whole cgroup, this includes the Quobyte client(s) handling the instances
mount point(s), which effectively removes the image from under the
VM(s).

Possible immediate Mitigation steps:
- Do _NOT_ restart/stop a Nova service that has running instances using images in Cinder Quobyte volumes
- Reconfigure sytemd.kill to use killmode=process or killmode=none instead of killmode=control-group (which is the default).
- Migrate instances off the host prior to restarting/stopping the Nova service.

The future solution will be to remove the client instance from the
cgroup of the Nova Quobyte driver.

** Affects: nova
     Importance: Undecided
     Assignee: Silvan Kaiser (2-silvan)
         Status: New


** Tags: quobyte

** Changed in: nova
     Assignee: (unassigned) => Silvan Kaiser (2-silvan)

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https://bugs.launchpad.net/bugs/1530860

Title:
  Nova service restart disconnects Quobyte volumes on systemd systems

Status in OpenStack Compute (nova):
  New

Bug description:
  When running an instance from an image in a Cinder Quobyte volume
  issues arise when the corresponding Nova service (openstack-nova-
  compute) is restarted or stopped while the instance is active. systemd
  sigterms the whole cgroup, this includes the Quobyte client(s)
  handling the instances mount point(s), which effectively removes the
  image from under the VM(s).

  Possible immediate Mitigation steps:
  - Do _NOT_ restart/stop a Nova service that has running instances using images in Cinder Quobyte volumes
  - Reconfigure sytemd.kill to use killmode=process or killmode=none instead of killmode=control-group (which is the default).
  - Migrate instances off the host prior to restarting/stopping the Nova service.

  The future solution will be to remove the client instance from the
  cgroup of the Nova Quobyte driver.

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