f0b8204072
As discussed at our nova meetings, reorganize the juno specs into three directories: - proposed: things proposed which weren't approved - approved: things we approved but didn't implement - implemented: things approved and implemented The first I suspect is the most controversial. I've done this because I worry about the case where a future developer wants to pick up something dropped by a previous developer, but has trouble finding previous proposed specifications on the topic. Note that the actual proposed specs for Juno are adding in a later commit. Change-Id: Idcf55ca37a83d7098dcb7c2971240c4e8fd23dc8
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This work is licensed under a Creative Commons Attribution 3.0 Unported
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License.
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http://creativecommons.org/licenses/by/3.0/legalcode
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===========================================
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Enable cold migration with target host
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===========================================
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https://blueprints.launchpad.net/nova/+spec/cold-migration-with-target
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The aim of this feature is to let operators cold migrate instances with
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target host manually.
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Problem description
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===================
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I have a customized HA plugin which automatically performs migrations under
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certain conditions, and the HA plugin is able to intelligently pick up
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destinations, but only live migrations support specifying destinations.
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At the moment cold migration do not support migrate a VM instance with target
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host, this blueprint want to add this feature to nova so that above scenario
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can be satisified.
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It also make cold migration consistent with live-migrate operations as live
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migration support migration with and w/o target host.
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Proposed change
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===============
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Modify the current resize_instance flow to let the api can specify the target
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host for cold migration.
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Alternatives
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------------
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None
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Data model impact
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-----------------
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None
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REST API impact
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---------------
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* For V2 API, a new extension will be added as:
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alias: os-extended-admin-actions
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name: ExtendedAdminActions
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namespace:
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http://docs.openstack.org/compute/ext/extended_admin_actions/api/v1.1
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When the new extension "os-extended-admin-actions" is loaded, the api of
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_migrate() wil support cold migration with target host.
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* For a later microversion of v2.1 API, no new extension needed, the
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existing cold migration API will be updated to support this.
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* URL: existed admin actions extension as:
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* /v2/{tenant_id}/servers/actions:
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* /v2.1/servers/actions:
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JSON request body::
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{
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"migrate":
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{
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"host": "fake_host"
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}
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}
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Security impact
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---------------
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None
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Notifications impact
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--------------------
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None
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Other end user impact
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---------------------
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python-novaclient will be modified to have target_host argument as
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optional.
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The user can trigger this feature by:
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nova migrate my_server target_host
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Performance Impact
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------------------
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None
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Other deployer impact
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---------------------
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None
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Developer impact
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----------------
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None
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Implementation
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==============
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Assignee(s)
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-----------
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Primary assignee:
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jay-lau-513
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Work Items
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----------
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* Add logic to select target host for cold migration
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* Add API v2/v2.1
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* Set target host optional on nova-client
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Dependencies
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============
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None
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Testing
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=======
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Add unit test in nova to cover the case of cold migration with target host,
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also we probably need to think about adding functionnal tests in tempest.
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Documentation Impact
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====================
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* Api Docs to reflect that target host field is optional.
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* Client docs ( due to optional arg)
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* Admin User Guide on cold migration topic.
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References
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==========
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None
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