162 lines
6.1 KiB
Python
162 lines
6.1 KiB
Python
# Copyright (c) 2014 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.
|
|
|
|
import os
|
|
|
|
import eventlet
|
|
from oslo_config import cfg
|
|
from oslo_log import log as logging
|
|
import webob
|
|
|
|
from neutron.agent.linux import keepalived
|
|
from neutron.agent.linux import utils as agent_utils
|
|
from neutron.common import utils as common_utils
|
|
from neutron.i18n import _LI
|
|
from neutron.notifiers import batch_notifier
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
KEEPALIVED_STATE_CHANGE_SERVER_BACKLOG = 4096
|
|
|
|
OPTS = [
|
|
cfg.StrOpt('ha_confs_path',
|
|
default='$state_path/ha_confs',
|
|
help=_('Location to store keepalived/conntrackd '
|
|
'config files')),
|
|
cfg.StrOpt('ha_vrrp_auth_type',
|
|
default='PASS',
|
|
choices=keepalived.VALID_AUTH_TYPES,
|
|
help=_('VRRP authentication type')),
|
|
cfg.StrOpt('ha_vrrp_auth_password',
|
|
help=_('VRRP authentication password'),
|
|
secret=True),
|
|
cfg.IntOpt('ha_vrrp_advert_int',
|
|
default=2,
|
|
help=_('The advertisement interval in seconds')),
|
|
]
|
|
|
|
|
|
class KeepalivedStateChangeHandler(object):
|
|
def __init__(self, agent):
|
|
self.agent = agent
|
|
|
|
@webob.dec.wsgify(RequestClass=webob.Request)
|
|
def __call__(self, req):
|
|
router_id = req.headers['X-Neutron-Router-Id']
|
|
state = req.headers['X-Neutron-State']
|
|
self.enqueue(router_id, state)
|
|
|
|
def enqueue(self, router_id, state):
|
|
LOG.debug('Handling notification for router '
|
|
'%(router_id)s, state %(state)s', {'router_id': router_id,
|
|
'state': state})
|
|
self.agent.enqueue_state_change(router_id, state)
|
|
|
|
|
|
class L3AgentKeepalivedStateChangeServer(object):
|
|
def __init__(self, agent, conf):
|
|
self.agent = agent
|
|
self.conf = conf
|
|
|
|
agent_utils.ensure_directory_exists_without_file(
|
|
self.get_keepalived_state_change_socket_path(self.conf))
|
|
|
|
@classmethod
|
|
def get_keepalived_state_change_socket_path(cls, conf):
|
|
return os.path.join(conf.state_path, 'keepalived-state-change')
|
|
|
|
def run(self):
|
|
server = agent_utils.UnixDomainWSGIServer(
|
|
'neutron-keepalived-state-change')
|
|
server.start(KeepalivedStateChangeHandler(self.agent),
|
|
self.get_keepalived_state_change_socket_path(self.conf),
|
|
workers=0,
|
|
backlog=KEEPALIVED_STATE_CHANGE_SERVER_BACKLOG)
|
|
server.wait()
|
|
|
|
|
|
class AgentMixin(object):
|
|
def __init__(self, host):
|
|
self._init_ha_conf_path()
|
|
super(AgentMixin, self).__init__(host)
|
|
self.state_change_notifier = batch_notifier.BatchNotifier(
|
|
self._calculate_batch_duration(), self.notify_server)
|
|
eventlet.spawn(self._start_keepalived_notifications_server)
|
|
|
|
def _start_keepalived_notifications_server(self):
|
|
state_change_server = (
|
|
L3AgentKeepalivedStateChangeServer(self, self.conf))
|
|
state_change_server.run()
|
|
|
|
def _calculate_batch_duration(self):
|
|
# Slave becomes the master after not hearing from it 3 times
|
|
detection_time = self.conf.ha_vrrp_advert_int * 3
|
|
|
|
# Keepalived takes a couple of seconds to configure the VIPs
|
|
configuration_time = 2
|
|
|
|
# Give it enough slack to batch all events due to the same failure
|
|
return (detection_time + configuration_time) * 2
|
|
|
|
def enqueue_state_change(self, router_id, state):
|
|
LOG.info(_LI('Router %(router_id)s transitioned to %(state)s'),
|
|
{'router_id': router_id,
|
|
'state': state})
|
|
|
|
try:
|
|
ri = self.router_info[router_id]
|
|
except AttributeError:
|
|
LOG.info(_LI('Router %s is not managed by this agent. It was '
|
|
'possibly deleted concurrently.'), router_id)
|
|
return
|
|
|
|
self._update_metadata_proxy(ri, router_id, state)
|
|
self._update_radvd_daemon(ri, state)
|
|
self.state_change_notifier.queue_event((router_id, state))
|
|
|
|
def _update_metadata_proxy(self, ri, router_id, state):
|
|
if state == 'master':
|
|
LOG.debug('Spawning metadata proxy for router %s', router_id)
|
|
self.metadata_driver.spawn_monitored_metadata_proxy(
|
|
self.process_monitor, ri.ns_name, self.conf.metadata_port,
|
|
self.conf, router_id=ri.router_id)
|
|
else:
|
|
LOG.debug('Closing metadata proxy for router %s', router_id)
|
|
self.metadata_driver.destroy_monitored_metadata_proxy(
|
|
self.process_monitor, ri.router_id, self.conf)
|
|
|
|
def _update_radvd_daemon(self, ri, state):
|
|
# Radvd has to be spawned only on the Master HA Router. If there are
|
|
# any state transitions, we enable/disable radvd accordingly.
|
|
if state == 'master':
|
|
ri.enable_radvd()
|
|
else:
|
|
ri.disable_radvd()
|
|
|
|
def notify_server(self, batched_events):
|
|
translation_map = {'master': 'active',
|
|
'backup': 'standby',
|
|
'fault': 'standby'}
|
|
translated_states = dict((router_id, translation_map[state]) for
|
|
router_id, state in batched_events)
|
|
LOG.debug('Updating server with HA routers states %s',
|
|
translated_states)
|
|
self.plugin_rpc.update_ha_routers_states(
|
|
self.context, translated_states)
|
|
|
|
def _init_ha_conf_path(self):
|
|
ha_full_path = os.path.dirname("/%s/" % self.conf.ha_confs_path)
|
|
common_utils.ensure_dir(ha_full_path)
|