***************Host Aggregate********************

https://docs.openstack.org/nova/queens/user/aggregates.html

nova里的相关指令：

aggregate-add-host          Add the host to the specified aggregate.
aggregate-create            Create a new aggregate with the specified details.
aggregate-delete            Delete the aggregate.
aggregate-details           Show details of the specified aggregate.
aggregate-list              Print a list of all aggregates.
aggregate-remove-host       Remove the specified host from the specified aggregate.
aggregate-set-metadata      Update the metadata associated with the aggregate.
aggregate-update            Update the aggregate’s name and optionally availability zone.
availability-zone-list      List all the availability zones.

要点：

++一个host可以定义在多个Host Aggregate里，但只能属于一个Availability Zone。

++Availability Zone是在指令nova aggregate-create中创建的。

++必须先使用nova aggregate-remove-host 指令删除HA中host，然后才能删除该HA

 

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