def remove_from_aggregate(self, context, aggregate, host, slave_info=None):
"""Remove a compute host from an aggregate."""
slave_info = slave_info or dict()
if not self._is_hv_pool(context, aggregate.id):
return
invalid = {
pool_states.CREATED: 'no hosts to remove',
pool_states.CHANGING: 'setup in progress',
pool_states.DISMISSED: 'aggregate deleted',
}
if (self._get_metadata(context, aggregate.id)[pool_states.KEY]
in invalid.keys()):
raise exception.InvalidAggregateAction(
action='remove host',
aggregate_id=aggregate.id,
reason=invalid[self._get_metadata(
context, aggregate.id)[pool_states.KEY]])
master_compute = self._get_metadata(context,
aggregate.id)['master_compute']
if master_compute == CONF.host and master_compute != host:
# this is the master -> instruct it to eject a host from the pool
host_uuid = self._get_metadata(context, aggregate.id)[host]
self._eject_slave(aggregate.id, slave_info.get('compute_uuid'),
host_uuid)
self._virtapi.aggregate_metadata_delete(context, aggregate.id,
host)
elif master_compute == host:
# Remove master from its own pool -> destroy pool only if the
# master is on its own, otherwise raise fault. Destroying a
# pool made only by master is fictional
if len(aggregate.hosts) > 1:
# NOTE: this could be avoided by doing a master
# re-election, but this is simpler for now.
raise exception.InvalidAggregateAction(
aggregate_id=aggregate.id,
action='remove_from_aggregate',
reason=_('Unable to eject %(host)s '
'from the pool; pool not empty') % locals())
self._clear_pool(aggregate.id)
for key in ['master_compute', host]:
self._virtapi.aggregate_metadata_delete(
context, aggregate.id, key)
elif master_compute and master_compute != host:
# A master exists -> forward pool-eject request to master
slave_info = self._create_slave_info()
self.compute_rpcapi.remove_aggregate_host(context, aggregate.id,
host, master_compute,
slave_info)
else:
# this shouldn't have happened
raise exception.AggregateError(
aggregate_id=aggregate.id,
action='remove_from_aggregate',
reason=_('Unable to eject %(host)s '
'from the pool; No master found') % locals())
def remove_from_aggregate(self,
context,
aggregate,
host,
subordinate_info=None):
"""Remove a compute host from an aggregate."""
subordinate_info = subordinate_info or dict()
if not pool_states.is_hv_pool(aggregate['metadata']):
return
invalid = {
pool_states.CREATED: 'no hosts to remove',
pool_states.CHANGING: 'setup in progress',
pool_states.DISMISSED: 'aggregate deleted',
}
if aggregate['metadata'][pool_states.KEY] in invalid.keys():
raise exception.InvalidAggregateAction(
action='remove host',
aggregate_id=aggregate['id'],
reason=invalid[aggregate['metadata'][pool_states.KEY]])
main_compute = aggregate['metadata']['main_compute']
if main_compute == CONF.host and main_compute != host:
# this is the main -> instruct it to eject a host from the pool
host_uuid = aggregate['metadata'][host]
self._eject_subordinate(aggregate['id'],
subordinate_info.get('compute_uuid'),
host_uuid)
aggregate.update_metadata({host: None})
elif main_compute == host:
# Remove main from its own pool -> destroy pool only if the
# main is on its own, otherwise raise fault. Destroying a
# pool made only by main is fictional
if len(aggregate['hosts']) > 1:
# NOTE: this could be avoided by doing a main
# re-election, but this is simpler for now.
raise exception.InvalidAggregateAction(
aggregate_id=aggregate['id'],
action='remove_from_aggregate',
reason=_('Unable to eject %s '
'from the pool; pool not empty') % host)
self._clear_pool(aggregate['id'])
aggregate.update_metadata({'main_compute': None, host: None})
elif main_compute and main_compute != host:
# A main exists -> forward pool-eject request to main
subordinate_info = self._create_subordinate_info()
self.compute_rpcapi.remove_aggregate_host(context, aggregate['id'],
host, main_compute,
subordinate_info)
else:
# this shouldn't have happened
raise exception.AggregateError(
aggregate_id=aggregate['id'],
action='remove_from_aggregate',
reason=_('Unable to eject %s '
'from the pool; No main found') % host)
def add_to_aggregate(self,
context,
aggregate,
host,
subordinate_info=None):
"""Add a compute host to an aggregate."""
if not pool_states.is_hv_pool(aggregate['metadata']):
return
invalid = {
pool_states.CHANGING: 'setup in progress',
pool_states.DISMISSED: 'aggregate deleted',
pool_states.ERROR: 'aggregate in error'
}
if (aggregate['metadata'][pool_states.KEY] in invalid.keys()):
raise exception.InvalidAggregateAction(
action='add host',
aggregate_id=aggregate['id'],
reason=aggregate['metadata'][pool_states.KEY])
if (aggregate['metadata'][pool_states.KEY] == pool_states.CREATED):
aggregate.update_metadata({pool_states.KEY: pool_states.CHANGING})
if len(aggregate['hosts']) == 1:
# this is the first host of the pool -> make it main
self._init_pool(aggregate['id'], aggregate['name'])
# save metadata so that we can find the main again
metadata = {
'main_compute': host,
host: self._host_uuid,
pool_states.KEY: pool_states.ACTIVE
}
aggregate.update_metadata(metadata)
else:
# the pool is already up and running, we need to figure out
# whether we can serve the request from this host or not.
main_compute = aggregate['metadata']['main_compute']
if main_compute == CONF.host and main_compute != host:
# this is the main -> do a pool-join
# To this aim, nova compute on the subordinate has to go down.
# NOTE: it is assumed that ONLY nova compute is running now
self._join_subordinate(aggregate['id'], host,
subordinate_info.get('compute_uuid'),
subordinate_info.get('url'),
subordinate_info.get('user'),
subordinate_info.get('passwd'))
metadata = {
host: subordinate_info.get('xenhost_uuid'),
}
aggregate.update_metadata(metadata)
elif main_compute and main_compute != host:
# send rpc cast to main, asking to add the following
# host with specified credentials.
subordinate_info = self._create_subordinate_info()
self.compute_rpcapi.add_aggregate_host(context, aggregate,
host, main_compute,
subordinate_info)
def stub_add_host_to_aggregate(context, aggregate, host):
raise exception.InvalidAggregateAction()