Balazs Gibizer
2794748d9c
Bugfix Icaf1bae8cb040b939f916a19ce026031ddb84af7 showed that restarting a compute service in the functional env is unrealistic causing faults to slip through. During that bug fix only the minimal change was done in the functional env regarding compute service restart to reproduce the reported fault. However the restart of the compute service could be made even more realistic. This patch simulates a compute service restart in the functional env by stopping the original compute service and starting a totally new compute service for the same host and node. This way we can make sure that we get a brand new ComputeManager in the new service and no state can leak between the old and the new service. This change revealed another shortcoming of the functional env. In the real world the nova-compute service could be restarted without loosing any running servers on the compute host. But with the naive implementation of this change the compute service is re-created. This means that a new ComputeManager is instantiated that loads a new FakeDriver instance as well. That new FakeDriver instance then reports an empty hypervisor. This behavior is not totally unrealistic as it simulates such a compute host restart that cleans the hypervisor state as well (e.g. compute host redeployment). However this type of restart shows another bug in the code path that destroys and deallocates evacuated instance from the source host. Therefore this patch implements the compute service restart in a way that simulates only a service restart and not a full compute restart. A subsequent patch will add a test that uses the clean hypervisor case to reproduces the revealed bug. Related-Bug: #1724172 Change-Id: I9d6cd6259659a35383c0c9c21db72a9434ba86b1
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Team and repository tags
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.. 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
==============
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, XenServer, OpenStack Ironic and PowerVM.
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://developer.openstack.org/api-guide/compute/>`__
- `Compute API Reference <https://developer.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/