95106d2fa1
This adds a new CLI which will iterate all non-cell0 cells looking for instances that (1) have a host, (2) aren't undergoing a task state transition and (3) don't have allocations in placement and try to allocate resources, based on the instance embedded flavor, against the compute node resource provider on which the instance is currently running. This is meant as a way to help migrate CachingScheduler users off the CachingScheduler by first shoring up instance allocations in placement for any instances created after Pike, when the nova-compute resource tracker code stopped creating allocations in placement since the FilterScheduler does it at the time of scheduling (but the CachingScheduler doesn't). This will be useful beyond just getting deployments off the CachingScheduler, however, since operators will be able to use it to fix incorrect allocations resulting from failed operations. There are several TODOs and NOTEs inline about things we could build on top of this or improve, but for now this is the basic idea. Change-Id: Iab67fd56ab4845f8ee19ca36e7353730638efb21
19 lines
1.0 KiB
YAML
19 lines
1.0 KiB
YAML
---
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other:
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A new ``nova-manage placement heal_allocations`` CLI has been added to
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help migrate users from the deprecated CachingScheduler. Starting in
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16.0.0 (Pike), the nova-compute service no longer reports instance
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allocations to the Placement service because the FilterScheduler does
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that as part of scheduling. However, the CachingScheduler does not create
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the allocations in the Placement service, so any instances created using
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the CachingScheduler after Ocata will not have allocations in Placement.
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The new CLI allows operators using the CachingScheduler to find all
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instances in all cells which do not have allocations in Placement and
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create those allocations. The CLI will skip any instances that are
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undergoing a task state transition, so ideally this would be run when
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the API is down but it can be run, if necessary, while the API is up.
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For more details on CLI usage, see the man page entry:
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https://docs.openstack.org/nova/latest/cli/nova-manage.html#placement
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