OpenStack Networking (Neutron)
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neutron/neutron/agent/l3/ha.py

194 lines
7.9 KiB

# 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_log import log as logging
from oslo_utils import fileutils
import webob
from neutron.agent.linux import utils as agent_utils
from neutron.common import constants
from neutron.notifiers import batch_notifier
LOG = logging.getLogger(__name__)
KEEPALIVED_STATE_CHANGE_SERVER_BACKLOG = 4096
TRANSLATION_MAP = {'master': constants.HA_ROUTER_STATE_ACTIVE,
'backup': constants.HA_ROUTER_STATE_STANDBY,
'fault': constants.HA_ROUTER_STATE_STANDBY,
'unknown': constants.HA_ROUTER_STATE_UNKNOWN}
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',
num_threads=self.conf.ha_keepalived_state_change_server_threads)
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)
# BatchNotifier queue is needed to ensure that the HA router
# state change sequence is under the proper order.
self.state_change_notifier = batch_notifier.BatchNotifier(
self._calculate_batch_duration(), self.notify_server)
eventlet.spawn(self._start_keepalived_notifications_server)
def _get_router_info(self, router_id):
try:
return self.router_info[router_id]
except KeyError:
LOG.info('Router %s is not managed by this agent. It was '
'possibly deleted concurrently.', router_id)
def check_ha_state_for_router(self, router_id, current_state):
ri = self._get_router_info(router_id)
if not ri:
return
ha_state = ri.ha_state
if current_state != TRANSLATION_MAP[ha_state]:
LOG.debug("Updating server with state %(state)s for router "
"%(router_id)s", {'router_id': router_id,
'state': ha_state})
self.state_change_notifier.queue_event((router_id, ha_state))
def _start_keepalived_notifications_server(self):
state_change_server = (
L3AgentKeepalivedStateChangeServer(self, self.conf))
state_change_server.run()
def _calculate_batch_duration(self):
# Set the BatchNotifier interval to ha_vrrp_advert_int,
# default 2 seconds.
return self.conf.ha_vrrp_advert_int
def enqueue_state_change(self, router_id, state):
state_change_data = {"router_id": router_id, "state": state}
LOG.info('Router %(router_id)s transitioned to %(state)s',
state_change_data)
ri = self._get_router_info(router_id)
if ri is None:
return
# TODO(dalvarez): Fix bug 1677279 by moving the IPv6 parameters
# configuration to keepalived-state-change in order to remove the
# dependency that currently exists on l3-agent running for the IPv6
# failover.
self._configure_ipv6_params(ri, state)
if self.conf.enable_metadata_proxy:
self._update_metadata_proxy(ri, router_id, state)
self._update_radvd_daemon(ri, state)
self.pd.process_ha_state(router_id, state == 'master')
self.state_change_notifier.queue_event((router_id, state))
self.l3_ext_manager.ha_state_change(self.context, state_change_data)
def _configure_ipv6_params(self, ri, state):
if not self.use_ipv6:
return
ipv6_forwarding_enable = state == 'master'
if ri.router.get('distributed', False):
namespace = ri.ha_namespace
else:
namespace = ri.ns_name
if ipv6_forwarding_enable:
ri.driver.configure_ipv6_forwarding(
namespace, 'all', ipv6_forwarding_enable)
# If ipv6 is enabled on the platform, ipv6_gateway config flag is
# not set and external_network associated to the router does not
# include any IPv6 subnet, enable the gateway interface to accept
# Router Advts from upstream router for default route on master
# instances as well as ipv6 forwarding. Otherwise, disable them.
ex_gw_port_id = ri.ex_gw_port and ri.ex_gw_port['id']
if ex_gw_port_id:
interface_name = ri.get_external_device_name(ex_gw_port_id)
ri._configure_ipv6_params_on_gw(
ri.ex_gw_port, namespace, interface_name,
ipv6_forwarding_enable)
def _update_metadata_proxy(self, ri, router_id, state):
# NOTE(slaweq): Since the metadata proxy is spawned in the qrouter
# namespace and not in the snat namespace, even standby DVR-HA
# routers needs to serve metadata requests to local ports.
if state == 'master' or ri.router.get('distributed', False):
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, ri.ns_name)
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):
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)
fileutils.ensure_tree(ha_full_path, mode=0o755)