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162 lines
3.4 KiB
ReStructuredText
162 lines
3.4 KiB
ReStructuredText
..
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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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Affinity/Anti Affinity of instances in a groups
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===============================================
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https://blueprints.launchpad.net/nova/+spec/tbd
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This BP proposes a way for creating affinity and anti-affinity for ironic nodes.
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Problem description
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===================
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Currently there is no way to create aggregation for Ironic nodes, instead
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aggregates works only for compute nodes, so it is impossible for creating
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affinity/anti-affinity rules for such nodes
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Use Cases
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---------
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As a system administrator I want to be able to define aggregation of the Ironic
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nodes in Nova, so that I can apply affinity or anti-affinity policy to the
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server group.
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As a system administrator I want to be able to define aggregation of the Ironic
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nodes in Nova, so that I can define logical division of my data center.
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Proposed change
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===============
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This task can be divided into two separate parts. First is a change of behavior
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of host aggregates, to be able to include ironic nodes.
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Second, involves changes to the scheduler to support spreading instances across
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various groups.
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Example session, which present the change, could be as follows:
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.. code:: shell-session
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openstack aggregate create rack1
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openstack aggregate create rack2
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openstack aggregate set --property rack=1 rack1
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openstack aggregate set --property rack=1 rack2
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openstack aggregate add host rack1 <UUID of Ironic node A>
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openstack aggregate add host rack2 <UUID of Ironic node B>
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openstack server group create --policy rack-anti-affinity not-same-rack
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openstack server create --image=IMAGE_ID --flavor=1 \
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--hint group=not-same-rack server1
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First, we create two aggregates which would represent the rack, next we append
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a rack metadata set to 1, so it indicate that this aggregate is ``rack`` based,
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next we add ironic nodes by their UUID. Next, we create server group, with
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desired policy, and finally spin the instance.
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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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Introduce new microversion for adding new policies for node
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(soft)(anti)affinity
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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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None
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Performance Impact
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------------------
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Potentially, there could be performance impact on accessing aggregation
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information.
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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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Upgrade 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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<launchpad-id or None>
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Other contributors:
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<launchpad-id or None>
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Work Items
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----------
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* Allow ironic nodes to be associated with host aggregation
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* Add policy for affinity/anti-affinity/soft-affinity/soft-anti-affinity for
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nodes, instead of hypervisors
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* Implement scheduler filter for be able to use those policies
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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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TBD
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Documentation Impact
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====================
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Documentation of behaviour of creating/removing aggregation should be amended.
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References
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==========
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None
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History
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=======
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.. list-table:: Revisions
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:header-rows: 1
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* - Release Name
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- Description
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* - Rocky
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- Introduced
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