175 lines
6.9 KiB
Python
175 lines
6.9 KiB
Python
# Copyright (c) 2014 OpenStack Foundation.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import eventlet
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from oslo_config import cfg
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from oslo_log import log as logging
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import webob
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from neutron.agent.linux import keepalived
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from neutron.agent.linux import utils as agent_utils
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from neutron.common import utils as common_utils
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from neutron.i18n import _LI
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from neutron.notifiers import batch_notifier
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LOG = logging.getLogger(__name__)
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KEEPALIVED_STATE_CHANGE_SERVER_BACKLOG = 4096
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OPTS = [
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cfg.StrOpt('ha_confs_path',
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default='$state_path/ha_confs',
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help=_('Location to store keepalived/conntrackd '
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'config files')),
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cfg.StrOpt('ha_vrrp_auth_type',
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default='PASS',
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choices=keepalived.VALID_AUTH_TYPES,
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help=_('VRRP authentication type')),
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cfg.StrOpt('ha_vrrp_auth_password',
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help=_('VRRP authentication password'),
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secret=True),
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cfg.IntOpt('ha_vrrp_advert_int',
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default=2,
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help=_('The advertisement interval in seconds')),
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]
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class KeepalivedStateChangeHandler(object):
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def __init__(self, agent):
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self.agent = agent
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@webob.dec.wsgify(RequestClass=webob.Request)
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def __call__(self, req):
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router_id = req.headers['X-Neutron-Router-Id']
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state = req.headers['X-Neutron-State']
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self.enqueue(router_id, state)
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def enqueue(self, router_id, state):
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LOG.debug('Handling notification for router '
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'%(router_id)s, state %(state)s', {'router_id': router_id,
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'state': state})
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self.agent.enqueue_state_change(router_id, state)
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class L3AgentKeepalivedStateChangeServer(object):
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def __init__(self, agent, conf):
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self.agent = agent
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self.conf = conf
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agent_utils.ensure_directory_exists_without_file(
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self.get_keepalived_state_change_socket_path(self.conf))
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@classmethod
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def get_keepalived_state_change_socket_path(cls, conf):
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return os.path.join(conf.state_path, 'keepalived-state-change')
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def run(self):
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server = agent_utils.UnixDomainWSGIServer(
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'neutron-keepalived-state-change')
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server.start(KeepalivedStateChangeHandler(self.agent),
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self.get_keepalived_state_change_socket_path(self.conf),
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workers=0,
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backlog=KEEPALIVED_STATE_CHANGE_SERVER_BACKLOG)
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server.wait()
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class AgentMixin(object):
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def __init__(self, host):
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self._init_ha_conf_path()
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super(AgentMixin, self).__init__(host)
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self.state_change_notifier = batch_notifier.BatchNotifier(
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self._calculate_batch_duration(), self.notify_server)
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eventlet.spawn(self._start_keepalived_notifications_server)
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def _start_keepalived_notifications_server(self):
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state_change_server = (
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L3AgentKeepalivedStateChangeServer(self, self.conf))
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state_change_server.run()
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def _calculate_batch_duration(self):
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# Slave becomes the master after not hearing from it 3 times
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detection_time = self.conf.ha_vrrp_advert_int * 3
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# Keepalived takes a couple of seconds to configure the VIPs
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configuration_time = 2
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# Give it enough slack to batch all events due to the same failure
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return (detection_time + configuration_time) * 2
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def enqueue_state_change(self, router_id, state):
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LOG.info(_LI('Router %(router_id)s transitioned to %(state)s'),
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{'router_id': router_id,
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'state': state})
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try:
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ri = self.router_info[router_id]
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except AttributeError:
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LOG.info(_LI('Router %s is not managed by this agent. It was '
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'possibly deleted concurrently.'), router_id)
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return
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self._configure_ipv6_ra_on_ext_gw_port_if_necessary(ri, state)
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self._update_metadata_proxy(ri, router_id, state)
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self._update_radvd_daemon(ri, state)
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self.state_change_notifier.queue_event((router_id, state))
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def _configure_ipv6_ra_on_ext_gw_port_if_necessary(self, ri, state):
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# If ipv6 is enabled on the platform, ipv6_gateway config flag is
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# not set and external_network associated to the router does not
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# include any IPv6 subnet, enable the gateway interface to accept
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# Router Advts from upstream router for default route.
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ex_gw_port_id = ri.ex_gw_port and ri.ex_gw_port['id']
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if state == 'master' and ex_gw_port_id and ri.use_ipv6:
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gateway_ips = ri._get_external_gw_ips(ri.ex_gw_port)
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if not ri.is_v6_gateway_set(gateway_ips):
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interface_name = ri.get_external_device_name(ex_gw_port_id)
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ri.driver.configure_ipv6_ra(ri.ns_name, interface_name)
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def _update_metadata_proxy(self, ri, router_id, state):
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if state == 'master':
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LOG.debug('Spawning metadata proxy for router %s', router_id)
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self.metadata_driver.spawn_monitored_metadata_proxy(
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self.process_monitor, ri.ns_name, self.conf.metadata_port,
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self.conf, router_id=ri.router_id)
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else:
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LOG.debug('Closing metadata proxy for router %s', router_id)
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self.metadata_driver.destroy_monitored_metadata_proxy(
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self.process_monitor, ri.router_id, self.conf)
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def _update_radvd_daemon(self, ri, state):
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# Radvd has to be spawned only on the Master HA Router. If there are
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# any state transitions, we enable/disable radvd accordingly.
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if state == 'master':
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ri.enable_radvd()
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else:
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ri.disable_radvd()
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def notify_server(self, batched_events):
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translation_map = {'master': 'active',
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'backup': 'standby',
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'fault': 'standby'}
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translated_states = dict((router_id, translation_map[state]) for
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router_id, state in batched_events)
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LOG.debug('Updating server with HA routers states %s',
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translated_states)
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self.plugin_rpc.update_ha_routers_states(
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self.context, translated_states)
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def _init_ha_conf_path(self):
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ha_full_path = os.path.dirname("/%s/" % self.conf.ha_confs_path)
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common_utils.ensure_dir(ha_full_path)
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