Dan Smith abbac59e33 Sanity check that new hosts have no instances
If we are starting up and we think we are a new host (i.e. no pre-
existing service record was found for us), we expect to have no
instances on our hypervisor. If that is not the case, it is likely
that we got pointed at a new fresh database or the wrong database
(i.e. a different cell from our own). In that case, we should abort
startup to avoid creating new service, compute node, and resource
provider records.

This is a sort of follow-on additional improvement related to
work done in blueprint stable-compute-uuid.

Change-Id: Id817c51c90485119270f3b7f3c52858f42100637
2023-10-02 12:35:00 -07:00
2019-04-19 19:45:52 +00:00
2017-11-24 16:51:12 -05:00
2023-08-13 09:16:27 +02:00
2017-09-07 15:42:31 +02:00
2022-08-02 15:31:19 +02:00
2017-03-02 11:50:48 +00:00
2023-08-31 21:02:48 +00:00

==============
OpenStack Nova
==============

.. image:: https://governance.openstack.org/tc/badges/nova.svg
    :target: https://governance.openstack.org/tc/reference/tags/index.html

.. Change things from this point on


OpenStack Nova provides a cloud computing fabric controller, supporting a wide
variety of compute technologies, including: libvirt (KVM, Xen, LXC and more),
Hyper-V, VMware and OpenStack Ironic.

Use the following resources to learn more.

API
---

To learn how to use Nova's API, consult the documentation available online at:

- `Compute API Guide <https://docs.openstack.org/api-guide/compute/>`__
- `Compute API Reference <https://docs.openstack.org/api-ref/compute/>`__

For more information on OpenStack APIs, SDKs and CLIs in general, refer to:

- `OpenStack for App Developers <https://www.openstack.org/appdev/>`__
- `Development resources for OpenStack clouds
  <https://developer.openstack.org/>`__

Operators
---------

To learn how to deploy and configure OpenStack Nova, consult the documentation
available online at:

- `OpenStack Nova <https://docs.openstack.org/nova/>`__

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:

- `Bug Tracker <https://bugs.launchpad.net/nova>`__

Developers
----------

For information on how to contribute to Nova, please see the contents of the
CONTRIBUTING.rst.

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:

- `Official Nova Documentation <https://docs.openstack.org/nova/>`__
- `Official Client Documentation
  <https://docs.openstack.org/python-novaclient/>`__

Other Information
-----------------

During each `Summit`_ and `Project Team Gathering`_, we agree on what the whole
community wants to focus on for the upcoming release. The plans for nova can
be found at:

- `Nova Specs <http://specs.openstack.org/openstack/nova-specs/>`__

.. _Summit: https://www.openstack.org/summit/
.. _Project Team Gathering: https://www.openstack.org/ptg/
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