7bc4be7815
When rebooting a compute host, guest VMs can be getting shutdown
automatically by the hypervisor and the virt driver is sending events to
the compute manager to handle them. If the compute service is still up
while this happens it will try to call the stop API to power off the
instance and update the database to show the instance as stopped.
When the compute service comes back up and events come in from the virt
driver that the guest VMs are running, nova will see that the vm_state
on the instance in the nova database is STOPPED and shut down the
instance by calling the stop API (basically ignoring what the virt
driver / hypervisor tells nova is the state of the guest VM).
Alternatively, if the compute service shuts down after changing the
intance task_state to 'powering-off' but before the stop API cast is
complete, the instance can be in a strange vm_state/task_state
combination that requires the admin to manually reset the task_state to
recover the instance.
Let's just try to avoid some of this mess by disconnecting the event
handling when the compute service is shutting down like we do for
neutron VIF plugging events. There could still be races here if the
compute service is shutting down after the hypervisor (e.g. libvirtd),
but this is at least a best attempt to do the mitigate the potential
damage.
Closes-Bug: #1444630
Related-Bug: #1293480
Related-Bug: #1408176
Conflicts:
nova/compute/manager.py
nova/tests/unit/compute/test_compute_mgr.py
Change-Id: I1a321371dff7933cdd11d31d9f9c2a2f850fd8d9
(cherry picked from commit d1fb8d0fbd)
OpenStack Nova README
OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of virtualization technologies, including KVM, Xen, LXC, VMware, and more. In addition to its native API, it includes compatibility with the commonly encountered Amazon EC2 and S3 APIs.
OpenStack Nova is distributed under the terms of the Apache License, Version 2.0. The full terms and conditions of this license are detailed in the LICENSE file.
Nova primarily consists of a set of Python daemons, though it requires and integrates with a number of native system components for databases, messaging and virtualization capabilities.
To keep updated with new developments in the OpenStack project follow @openstack on Twitter.
To learn how to deploy OpenStack Nova, consult the documentation available online at:
For information about the different compute (hypervisor) drivers supported by Nova, read this page on the wiki:
In the unfortunate event that bugs are discovered, they should be reported to the appropriate bug tracker. If you obtained the software from a 3rd party operating system vendor, it is often wise to use their own bug tracker for reporting problems. In all other cases use the master OpenStack bug tracker, available at:
Developers wishing to work on the OpenStack Nova project should always base their work on the latest Nova code, available from the master GIT repository at:
Developers should also join the discussion on the mailing list, at:
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Any new code must follow the development guidelines detailed in the HACKING.rst file, and pass all unit tests. Further developer focused documentation is available at:
For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst file.
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