nova/releasenotes/notes/mirror-host-aggregates-to-p...

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---
features:
- |
We now attempt to mirror the association of compute host to host aggregate
into the placement API. When administrators use the ``POST
/os-aggregates/{aggregate_id}/action`` Compute API call to add or remove a
host from an aggregate, the nova-api service will attempt to ensure that a
corresponding record is created in the placement API for the resource
provider (compute host) and host aggregate UUID.
The nova-api service needs to understand how to connect to the placement
service in order for this mirroring process to work. Administrators should
ensure that there is a ``[placement]`` section in the nova.conf file which
is used by the nova-api service, and that credentials for interacting with
placement are contained in that section.
If the ``[placement]`` section is missing from the nova-api's nova.conf
file, nothing will break however there will be some warnings generated in
the nova-api's log file when administrators associate a compute host with a
host aggregate. However, this will become a failure starting in the 19.0.0
Stein release.