43 lines
2.0 KiB
Python
43 lines
2.0 KiB
Python
# Copyright 2010 OpenStack Foundation
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""Possible states for host aggregates.
|
|
|
|
An aggregate may be 'created', in which case the admin has triggered its
|
|
creation, but the underlying hypervisor pool has not actually being set up
|
|
yet. An aggregate may be 'changing', meaning that the underlying hypervisor
|
|
pool is being setup. An aggregate may be 'active', in which case the underlying
|
|
hypervisor pool is up and running. An aggregate may be 'dismissed' when it has
|
|
no hosts and it has been deleted. An aggregate may be in 'error' in all other
|
|
cases.
|
|
A 'created' aggregate becomes 'changing' during the first request of
|
|
adding a host. During a 'changing' status no other requests will be accepted;
|
|
this is to allow the hypervisor layer to instantiate the underlying pool
|
|
without any potential race condition that may incur in master/slave-based
|
|
configurations. The aggregate goes into the 'active' state when the underlying
|
|
pool has been correctly instantiated.
|
|
All other operations (e.g. add/remove hosts) that succeed will keep the
|
|
aggregate in the 'active' state. If a number of continuous requests fail,
|
|
an 'active' aggregate goes into an 'error' state. To recover from such a state,
|
|
admin intervention is required. Currently an error state is irreversible,
|
|
that is, in order to recover from it an aggregate must be deleted.
|
|
"""
|
|
|
|
CREATED = 'created'
|
|
CHANGING = 'changing'
|
|
ACTIVE = 'active'
|
|
ERROR = 'error'
|
|
DISMISSED = 'dismissed'
|