Support for preemptible instances within Blazar

Registered by Pierre Riteau

Preemptible instances are instances which can be terminated by the infrastructure in case of limited resource availability, to allow higher priority instances to be launched. They can increase utilization of compute resources managed by Blazar, by filling the gaps between reservations.

Blueprint information

Status:
Started
Approver:
None
Priority:
Undefined
Drafter:
Pierre Riteau
Direction:
Needs approval
Assignee:
Pierre Riteau
Definition:
Drafting
Series goal:
Accepted for ussuri
Implementation:
Started
Milestone target:
milestone icon ussuri-2
Started by
Pierre Riteau

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Gerrit topic: https://review.opendev.org/#/q/topic:preemptibles

Addressed by: https://review.opendev.org/749152
    Delete instances running on reserved hosts when starting reservation

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