def cast_to_volume_host(context, host, method, update_db=True, **kwargs):
"""Cast request to a volume host queue"""
if update_db:
volume_id = kwargs.get('volume_id', None)
if volume_id is not None:
now = utils.utcnow()
db.volume_update(context, volume_id,
{'host': host, 'scheduled_at': now})
rpc.cast(context,
db.queue_get_for(context, 'volume', host),
{"method": method, "args": kwargs})
LOG.debug(_("Casted '%(method)s' to volume '%(host)s'") % locals())
def cast_to_volume_host(context, host, method, update_db=True, **kwargs):
"""Cast request to a volume host queue"""
if update_db:
volume_id = kwargs.get('volume_id', None)
if volume_id is not None:
now = utils.utcnow()
db.volume_update(context, volume_id, {
'host': host,
'scheduled_at': now
})
rpc.cast(context, db.queue_get_for(context, 'volume', host), {
"method": method,
"args": kwargs
})
LOG.debug(_("Casted '%(method)s' to volume '%(host)s'") % locals())
def schedule_live_migration(self,
context,
instance_id,
dest,
block_migration=False):
"""Live migration scheduling method.
:param context:
:param instance_id:
:param dest: destination host
:return:
The host where instance is running currently.
Then scheduler send request that host.
"""
# Whether instance exists and is running.
instance_ref = db.instance_get(context, instance_id)
# Checking instance.
self._live_migration_src_check(context, instance_ref)
# Checking destination host.
self._live_migration_dest_check(context, instance_ref, dest,
block_migration)
# Common checking.
self._live_migration_common_check(context, instance_ref, dest,
block_migration)
# Changing instance_state.
values = {"vm_state": vm_states.MIGRATING}
db.instance_update(context, instance_id, values)
# Changing volume state
for volume_ref in instance_ref['volumes']:
db.volume_update(context, volume_ref['id'],
{'status': 'migrating'})
src = instance_ref['host']
cast_to_compute_host(context,
src,
'live_migration',
update_db=False,
instance_id=instance_id,
dest=dest,
block_migration=block_migration)
def schedule_live_migration(self, context, instance_id, dest,
block_migration=False):
"""Live migration scheduling method.
:param context:
:param instance_id:
:param dest: destination host
:return:
The host where instance is running currently.
Then scheduler send request that host.
"""
# Whether instance exists and is running.
instance_ref = db.instance_get(context, instance_id)
# Checking instance.
self._live_migration_src_check(context, instance_ref)
# Checking destination host.
self._live_migration_dest_check(context, instance_ref,
dest, block_migration)
# Common checking.
self._live_migration_common_check(context, instance_ref,
dest, block_migration)
# Changing instance_state.
values = {"vm_state": vm_states.MIGRATING}
db.instance_update(context, instance_id, values)
# Changing volume state
for volume_ref in instance_ref['volumes']:
db.volume_update(context,
volume_ref['id'],
{'status': 'migrating'})
src = instance_ref['host']
cast_to_compute_host(context, src, 'live_migration',
update_db=False,
instance_id=instance_id,
dest=dest,
block_migration=block_migration)
