OpenStack Compute (Nova)
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Lee Yarwood bbf9d1de06 libvirt: Provide VIR_MIGRATE_PARAM_PERSIST_XML during live migration
The VIR_MIGRATE_PARAM_PERSIST_XML parameter was introduced in libvirt
v1.3.4 and is used to provide the new persistent configuration for the
destination during a live migration:

https://libvirt.org/html/libvirt-libvirt-domain.html#VIR_MIGRATE_PARAM_PERSIST_XML

Without this parameter the persistent configuration on the destination
will be the same as the original persistent configuration on the source
when the VIR_MIGRATE_PERSIST_DEST flag is provided.

As Nova does not currently provide the VIR_MIGRATE_PARAM_PERSIST_XML
param but does provide the VIR_MIGRATE_PERSIST_DEST flag this means that
a soft reboot by Nova of the instance after a live migration can revert
the domain back to the original persistent configuration from the
source.

Note that this is only possible in Nova as a soft reboot actually
results in the virDomainShutdown and virDomainLaunch libvirt APIs being
called that recreate the domain using the persistent configuration.
virDomainReboot does not result in this but is not called at this time.

The impact of this on the instance after the soft reboot is pretty
severe, host devices referenced in the original persistent configuration
on the source may not exist or could even be used by other users on the
destination. CPU and NUMA affinity could also differ drastically between
the two hosts resulting in the instance being unable to start etc.

As MIN_LIBVIRT_VERSION is now > v1.3.4 this change simply includes the
VIR_MIGRATE_PARAM_PERSIST_XML param using the same updated XML for the
destination as is already provided to VIR_MIGRATE_PARAM_DEST_XML.

NOTE(lyarwood): A simple change to test_migrate_v3_unicode is included
as Iccce0ab50eee515e533ab36c8e7adc10cb3f7019 had removed this from
master.

Co-authored-by: Tadayoshi Hosoya <tad-hosoya@wr.jp.nec.com>
Closes-Bug: #1890501
Change-Id: Ia3f1d8e83cbc574ce5cb440032e12bbcb1e10e98
(cherry picked from commit 1bb8ee95d4)
2020-08-25 16:01:58 +01:00
api-guide/source Add release notes for Cyborg-Nova integration. 2020-04-03 17:13:04 +08:00
api-ref/source [Trivial] FUP: addressed comments in support non-admin filter instances 2020-04-10 09:17:48 +00:00
devstack Merge "Find instance in another cell during floating IP re-association" 2019-09-13 15:19:55 +00:00
doc libvirt: Don't allow "reserving" file-backed memory 2020-06-30 15:42:10 +00:00
etc/nova Allow versioned discovery unauthenticated 2020-04-03 21:24:28 +00:00
gate nova-live-migration: Only stop n-cpu and q-agt during evacuation testing 2020-03-21 17:08:47 +00:00
nova libvirt: Provide VIR_MIGRATE_PARAM_PERSIST_XML during live migration 2020-08-25 16:01:58 +01:00
playbooks Enable cross-cell resize in the nova-multi-cell job 2019-12-23 10:10:57 -05:00
releasenotes Merge "libvirt: Don't allow "reserving" file-backed memory" into stable/ussuri 2020-07-08 08:12:56 +00:00
roles Enable cross-cell resize in the nova-multi-cell job 2019-12-23 10:10:57 -05:00
tools Fix cherry-pick check for merge patch 2020-07-03 10:01:28 +02:00
.coveragerc Remove nova/openstack/* from .coveragerc 2016-10-12 16:20:49 -04:00
.gitignore Delete the placement code 2019-04-28 20:06:15 +00:00
.gitreview Update .gitreview for stable/ussuri 2020-04-23 21:37:31 +00:00
.mailmap Add mailmap entry 2014-05-07 12:14:26 -07:00
.pre-commit-config.yaml Switch to hacking 2.x 2020-01-17 11:30:40 +00:00
.stestr.conf Finish stestr migration 2017-11-24 16:51:12 -05:00
.zuul.yaml zuul: remove legacy-tempest-dsvm-neutron-dvr-multinode-full 2020-07-17 09:44:08 +02:00
CONTRIBUTING.rst [Community goal] Update contributor documentation 2020-03-25 12:01:37 +00:00
HACKING.rst Merge "Make it easier to run a selection of tests relevant to ongoing work" 2019-11-22 20:58:18 +00:00
LICENSE initial commit 2010-05-27 23:05:26 -07:00
MAINTAINERS Fix broken URLs 2017-09-07 15:42:31 +02:00
README.rst Start README.rst with a better title 2019-11-19 17:29:28 +01:00
babel.cfg Get rid of distutils.extra. 2012-02-08 19:30:39 -08:00
bindep.txt Added openssh-client into bindep 2019-10-23 07:21:23 +00:00
lower-constraints.txt Merge "Use oslo policy flag to disable default change warning instead of all" 2020-04-21 10:04:19 +00:00
requirements.txt Merge "Use oslo policy flag to disable default change warning instead of all" 2020-04-21 10:04:19 +00:00
setup.cfg api: Add support for new cyborg extra specs 2020-04-08 13:19:39 +00:00
setup.py Updated from global requirements 2017-03-02 11:50:48 +00:00
test-requirements.txt Bump hacking min version to 3.0.1 2020-05-18 09:48:56 +00:00
tox.ini Check cherry-pick hashes in pep8 tox target 2020-06-16 06:47:20 -07:00

README.rst

OpenStack Nova

image

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:

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

Operators

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

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

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:

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: