Container Infrastructure Management Service for OpenStack
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# Copyright 2015 Huawei Technologies Co.,LTD.
#
# 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.
from oslo_log import log as logging
from magnum.common import exception
from magnum.conductor import k8s_api as k8s
from magnum.i18n import _
from magnum.i18n import _LI
from magnum.i18n import _LW
from magnum import objects
LOG = logging.getLogger(__name__)
class ScaleManager(object):
def __init__(self, context, osclient, bay):
self.context = context
self.osclient = osclient
self.old_bay = objects.Bay.get_by_uuid(context, bay.uuid)
self.new_bay = bay
def get_removal_nodes(self, hosts_output):
if not self._is_scale_down():
return list()
bay = self.new_bay
stack = self.osclient.heat().stacks.get(bay.stack_id)
hosts = hosts_output.get_output_value(stack)
if hosts is None:
raise exception.MagnumException(_(
"Output key '%(output_key)s' is missing from stack "
"%(stack_id)s") % {'output_key': hosts_output.heat_output,
'stack_id': stack.id})
hosts_no_container = list(hosts)
k8s_api = k8s.create_k8s_api(self.context, bay)
for pod in k8s_api.list_namespaced_pod(namespace='default').items:
host = pod.spec.node_name
if host in hosts_no_container:
hosts_no_container.remove(host)
LOG.debug('List of hosts that has no container: %s',
str(hosts_no_container))
num_of_removal = self._get_num_of_removal()
if len(hosts_no_container) < num_of_removal:
LOG.warning(_LW(
"About to remove %(num_removal)d nodes, which is larger than "
"the number of empty nodes (%(num_empty)d). %(num_non_empty)d "
"non-empty nodes will be removed."), {
'num_removal': num_of_removal,
'num_empty': len(hosts_no_container),
'num_non_empty': num_of_removal - len(hosts_no_container)})
hosts_to_remove = hosts_no_container[0:num_of_removal]
LOG.info(_LI('Require removal of hosts: %s'), hosts_to_remove)
return hosts_to_remove
def _is_scale_down(self):
return self.new_bay.node_count < self.old_bay.node_count
def _get_num_of_removal(self):
return self.old_bay.node_count - self.new_bay.node_count