Add a ServiceVersionFilter for the scheduler
Currently, there is no way in the scheduler to express that we want to pick a compute node having a minimum version (eg. that our cloud is fully upgraded)
The idea would be to filter out hosts based on a Service.
The rationale behind that is that operators would like to make sure that new instances are forced to be spawned on new compute nodes in the context of a rolling upgrade.
How that would impact move operations for existing instances is not targeted to be discussed in that blueprint.
Blueprint information
- Status:
- Not started
- Approver:
- None
- Priority:
- Undefined
- Drafter:
- Sylvain Bauza
- Direction:
- Needs approval
- Assignee:
- Sylvain Bauza
- Definition:
- New
- Series goal:
- None
- Implementation:
-
Unknown
- Milestone target:
- None
- Started by
- Completed by
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As an operator, I'd love to see this implemented so I would be happy to collaborate.
If we get the version information from the services we can also return this in the services listing, becoming handy information to check the cloud status at a glance (i.e. know at a glance and within nova how many nodes are running an which version). Currently the Service object has a version attribute that holds the object version. One idea could be adding another version attribute, holding the nova version. -- aloga
