db866fb542
Changesf1b9ac5aand9f6ff7e3were aimed at improving the robustness of the sync_state method. However both missed switching from spawn_n to spawn to properly deal with raised exceptions. Change-Id: Ieda4a5ecca63de67d8a9757962e7e3383fd9c9ea Related-bug: #1257514
633 lines
25 KiB
Python
633 lines
25 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 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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import netaddr
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from oslo.config import cfg
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from neutron.agent.common import config
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from neutron.agent.linux import dhcp
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from neutron.agent.linux import external_process
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from neutron.agent.linux import interface
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from neutron.agent import rpc as agent_rpc
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from neutron.common import constants
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from neutron.common import exceptions
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from neutron.common import legacy
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from neutron.common import topics
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from neutron.common import utils
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from neutron import context
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from neutron import manager
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from neutron.openstack.common import importutils
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from neutron.openstack.common import log as logging
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from neutron.openstack.common import loopingcall
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from neutron.openstack.common.rpc import common
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from neutron.openstack.common.rpc import proxy
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from neutron.openstack.common import service
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from neutron import service as neutron_service
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LOG = logging.getLogger(__name__)
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class DhcpAgent(manager.Manager):
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OPTS = [
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cfg.IntOpt('resync_interval', default=5,
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help=_("Interval to resync.")),
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cfg.StrOpt('dhcp_driver',
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default='neutron.agent.linux.dhcp.Dnsmasq',
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help=_("The driver used to manage the DHCP server.")),
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cfg.BoolOpt('use_namespaces', default=True,
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help=_("Allow overlapping IP.")),
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cfg.BoolOpt('enable_isolated_metadata', default=False,
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help=_("Support Metadata requests on isolated networks.")),
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cfg.BoolOpt('enable_metadata_network', default=False,
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help=_("Allows for serving metadata requests from a "
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"dedicated network. Requires "
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"enable_isolated_metadata = True")),
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cfg.IntOpt('num_sync_threads', default=4,
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help=_('Number of threads to use during sync process.')),
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cfg.StrOpt('metadata_proxy_socket',
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default='$state_path/metadata_proxy',
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help=_('Location of Metadata Proxy UNIX domain '
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'socket')),
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]
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def __init__(self, host=None):
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super(DhcpAgent, self).__init__(host=host)
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self.needs_resync = False
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self.conf = cfg.CONF
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self.cache = NetworkCache()
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self.root_helper = config.get_root_helper(self.conf)
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self.dhcp_driver_cls = importutils.import_class(self.conf.dhcp_driver)
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ctx = context.get_admin_context_without_session()
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self.plugin_rpc = DhcpPluginApi(topics.PLUGIN,
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ctx, self.conf.use_namespaces)
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# create dhcp dir to store dhcp info
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dhcp_dir = os.path.dirname("/%s/dhcp/" % self.conf.state_path)
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if not os.path.isdir(dhcp_dir):
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os.makedirs(dhcp_dir, 0o755)
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self.dhcp_version = self.dhcp_driver_cls.check_version()
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self._populate_networks_cache()
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def _populate_networks_cache(self):
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"""Populate the networks cache when the DHCP-agent starts."""
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try:
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existing_networks = self.dhcp_driver_cls.existing_dhcp_networks(
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self.conf,
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self.root_helper
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)
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for net_id in existing_networks:
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net = dhcp.NetModel(self.conf.use_namespaces,
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{"id": net_id,
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"subnets": [],
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"ports": []})
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self.cache.put(net)
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except NotImplementedError:
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# just go ahead with an empty networks cache
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LOG.debug(
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_("The '%s' DHCP-driver does not support retrieving of a "
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"list of existing networks"),
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self.conf.dhcp_driver
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)
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def after_start(self):
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self.run()
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LOG.info(_("DHCP agent started"))
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def run(self):
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"""Activate the DHCP agent."""
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self.sync_state()
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self.periodic_resync()
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def call_driver(self, action, network, **action_kwargs):
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"""Invoke an action on a DHCP driver instance."""
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try:
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# the Driver expects something that is duck typed similar to
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# the base models.
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driver = self.dhcp_driver_cls(self.conf,
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network,
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self.root_helper,
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self.dhcp_version,
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self.plugin_rpc)
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getattr(driver, action)(**action_kwargs)
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return True
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except exceptions.Conflict:
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# No need to resync here, the agent will receive the event related
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# to a status update for the network
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LOG.warning(_('Unable to %(action)s dhcp for %(net_id)s: there is '
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'a conflict with its current state; please check '
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'that the network and/or its subnet(s) still exist.')
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% {'net_id': network.id, 'action': action})
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except Exception as e:
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self.needs_resync = True
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if (isinstance(e, common.RemoteError)
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and e.exc_type == 'NetworkNotFound'
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or isinstance(e, exceptions.NetworkNotFound)):
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LOG.warning(_("Network %s has been deleted."), network.id)
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else:
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LOG.exception(_('Unable to %(action)s dhcp for %(net_id)s.')
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% {'net_id': network.id, 'action': action})
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@utils.synchronized('dhcp-agent')
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def sync_state(self):
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"""Sync the local DHCP state with Neutron."""
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LOG.info(_('Synchronizing state'))
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pool = eventlet.GreenPool(cfg.CONF.num_sync_threads)
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known_network_ids = set(self.cache.get_network_ids())
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try:
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active_networks = self.plugin_rpc.get_active_networks_info()
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active_network_ids = set(network.id for network in active_networks)
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for deleted_id in known_network_ids - active_network_ids:
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try:
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self.disable_dhcp_helper(deleted_id)
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except Exception:
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self.needs_resync = True
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LOG.exception(_('Unable to sync network state on deleted '
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'network %s'), deleted_id)
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for network in active_networks:
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pool.spawn(self.safe_configure_dhcp_for_network, network)
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pool.waitall()
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LOG.info(_('Synchronizing state complete'))
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except Exception:
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self.needs_resync = True
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LOG.exception(_('Unable to sync network state.'))
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def _periodic_resync_helper(self):
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"""Resync the dhcp state at the configured interval."""
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while True:
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eventlet.sleep(self.conf.resync_interval)
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if self.needs_resync:
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self.needs_resync = False
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self.sync_state()
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def periodic_resync(self):
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"""Spawn a thread to periodically resync the dhcp state."""
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eventlet.spawn(self._periodic_resync_helper)
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def safe_get_network_info(self, network_id):
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try:
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network = self.plugin_rpc.get_network_info(network_id)
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if not network:
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LOG.warn(_('Network %s has been deleted.'), network_id)
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return network
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except Exception:
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self.needs_resync = True
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LOG.exception(_('Network %s info call failed.'), network_id)
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def enable_dhcp_helper(self, network_id):
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"""Enable DHCP for a network that meets enabling criteria."""
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network = self.safe_get_network_info(network_id)
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if network:
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self.configure_dhcp_for_network(network)
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def safe_configure_dhcp_for_network(self, network):
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try:
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self.configure_dhcp_for_network(network)
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except (exceptions.NetworkNotFound, RuntimeError):
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LOG.warn(_('Network %s may have been deleted and its resources '
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'may have already been disposed.'), network.id)
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def configure_dhcp_for_network(self, network):
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if not network.admin_state_up:
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return
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for subnet in network.subnets:
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if subnet.enable_dhcp:
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if self.call_driver('enable', network):
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if (self.conf.use_namespaces and
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self.conf.enable_isolated_metadata):
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self.enable_isolated_metadata_proxy(network)
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self.cache.put(network)
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break
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def disable_dhcp_helper(self, network_id):
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"""Disable DHCP for a network known to the agent."""
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network = self.cache.get_network_by_id(network_id)
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if network:
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if (self.conf.use_namespaces and
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self.conf.enable_isolated_metadata):
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self.disable_isolated_metadata_proxy(network)
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if self.call_driver('disable', network):
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self.cache.remove(network)
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def refresh_dhcp_helper(self, network_id):
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"""Refresh or disable DHCP for a network depending on the current state
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of the network.
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"""
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old_network = self.cache.get_network_by_id(network_id)
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if not old_network:
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# DHCP current not running for network.
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return self.enable_dhcp_helper(network_id)
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network = self.safe_get_network_info(network_id)
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if not network:
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return
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old_cidrs = set(s.cidr for s in old_network.subnets if s.enable_dhcp)
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new_cidrs = set(s.cidr for s in network.subnets if s.enable_dhcp)
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if new_cidrs and old_cidrs == new_cidrs:
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self.call_driver('reload_allocations', network)
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self.cache.put(network)
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elif new_cidrs:
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if self.call_driver('restart', network):
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self.cache.put(network)
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else:
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self.disable_dhcp_helper(network.id)
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def release_lease_for_removed_ips(self, prev_port, updated_port, network):
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"""Releases the dhcp lease for ips removed from a port."""
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if prev_port:
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previous_ips = set(fixed_ip.ip_address
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for fixed_ip in prev_port.fixed_ips)
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current_ips = set(fixed_ip.ip_address
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for fixed_ip in updated_port.fixed_ips)
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# pass in port with removed ips on it
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removed_ips = previous_ips - current_ips
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if removed_ips:
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self.call_driver('release_lease',
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network,
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mac_address=updated_port.mac_address,
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removed_ips=removed_ips)
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@utils.synchronized('dhcp-agent')
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def network_create_end(self, context, payload):
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"""Handle the network.create.end notification event."""
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network_id = payload['network']['id']
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self.enable_dhcp_helper(network_id)
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@utils.synchronized('dhcp-agent')
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def network_update_end(self, context, payload):
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"""Handle the network.update.end notification event."""
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network_id = payload['network']['id']
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if payload['network']['admin_state_up']:
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self.enable_dhcp_helper(network_id)
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else:
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self.disable_dhcp_helper(network_id)
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@utils.synchronized('dhcp-agent')
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def network_delete_end(self, context, payload):
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"""Handle the network.delete.end notification event."""
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self.disable_dhcp_helper(payload['network_id'])
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@utils.synchronized('dhcp-agent')
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def subnet_update_end(self, context, payload):
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"""Handle the subnet.update.end notification event."""
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network_id = payload['subnet']['network_id']
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self.refresh_dhcp_helper(network_id)
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# Use the update handler for the subnet create event.
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subnet_create_end = subnet_update_end
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@utils.synchronized('dhcp-agent')
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def subnet_delete_end(self, context, payload):
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"""Handle the subnet.delete.end notification event."""
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subnet_id = payload['subnet_id']
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network = self.cache.get_network_by_subnet_id(subnet_id)
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if network:
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self.refresh_dhcp_helper(network.id)
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@utils.synchronized('dhcp-agent')
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def port_update_end(self, context, payload):
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"""Handle the port.update.end notification event."""
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updated_port = dhcp.DictModel(payload['port'])
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network = self.cache.get_network_by_id(updated_port.network_id)
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if network:
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prev_port = self.cache.get_port_by_id(updated_port.id)
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self.cache.put_port(updated_port)
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self.call_driver('reload_allocations', network)
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self.release_lease_for_removed_ips(prev_port, updated_port,
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network)
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# Use the update handler for the port create event.
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port_create_end = port_update_end
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@utils.synchronized('dhcp-agent')
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def port_delete_end(self, context, payload):
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"""Handle the port.delete.end notification event."""
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port = self.cache.get_port_by_id(payload['port_id'])
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if port:
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network = self.cache.get_network_by_id(port.network_id)
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self.cache.remove_port(port)
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self.call_driver('reload_allocations', network)
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removed_ips = [fixed_ip.ip_address
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for fixed_ip in port.fixed_ips]
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self.call_driver('release_lease',
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network,
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mac_address=port.mac_address,
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removed_ips=removed_ips)
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def enable_isolated_metadata_proxy(self, network):
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# The proxy might work for either a single network
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# or all the networks connected via a router
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# to the one passed as a parameter
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neutron_lookup_param = '--network_id=%s' % network.id
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meta_cidr = netaddr.IPNetwork(dhcp.METADATA_DEFAULT_CIDR)
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has_metadata_subnet = any(netaddr.IPNetwork(s.cidr) in meta_cidr
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for s in network.subnets)
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if (self.conf.enable_metadata_network and has_metadata_subnet):
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router_ports = [port for port in network.ports
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if (port.device_owner ==
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constants.DEVICE_OWNER_ROUTER_INTF)]
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if router_ports:
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# Multiple router ports should not be allowed
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if len(router_ports) > 1:
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LOG.warning(_("%(port_num)d router ports found on the "
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"metadata access network. Only the port "
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"%(port_id)s, for router %(router_id)s "
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"will be considered"),
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{'port_num': len(router_ports),
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'port_id': router_ports[0].id,
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'router_id': router_ports[0].device_id})
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neutron_lookup_param = ('--router_id=%s' %
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router_ports[0].device_id)
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def callback(pid_file):
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metadata_proxy_socket = cfg.CONF.metadata_proxy_socket
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proxy_cmd = ['neutron-ns-metadata-proxy',
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'--pid_file=%s' % pid_file,
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'--metadata_proxy_socket=%s' % metadata_proxy_socket,
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neutron_lookup_param,
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'--state_path=%s' % self.conf.state_path,
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'--metadata_port=%d' % dhcp.METADATA_PORT]
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proxy_cmd.extend(config.get_log_args(
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cfg.CONF, 'neutron-ns-metadata-proxy-%s.log' % network.id))
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return proxy_cmd
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pm = external_process.ProcessManager(
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self.conf,
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network.id,
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self.root_helper,
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network.namespace)
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pm.enable(callback)
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def disable_isolated_metadata_proxy(self, network):
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pm = external_process.ProcessManager(
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self.conf,
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network.id,
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self.root_helper,
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network.namespace)
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pm.disable()
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class DhcpPluginApi(proxy.RpcProxy):
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"""Agent side of the dhcp rpc API.
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API version history:
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1.0 - Initial version.
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1.1 - Added get_active_networks_info, create_dhcp_port,
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and update_dhcp_port methods.
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"""
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BASE_RPC_API_VERSION = '1.1'
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def __init__(self, topic, context, use_namespaces):
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super(DhcpPluginApi, self).__init__(
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topic=topic, default_version=self.BASE_RPC_API_VERSION)
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self.context = context
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self.host = cfg.CONF.host
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self.use_namespaces = use_namespaces
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def get_active_networks_info(self):
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"""Make a remote process call to retrieve all network info."""
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networks = self.call(self.context,
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self.make_msg('get_active_networks_info',
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host=self.host),
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topic=self.topic)
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return [dhcp.NetModel(self.use_namespaces, n) for n in networks]
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def get_network_info(self, network_id):
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"""Make a remote process call to retrieve network info."""
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network = self.call(self.context,
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self.make_msg('get_network_info',
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network_id=network_id,
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host=self.host),
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topic=self.topic)
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if network:
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return dhcp.NetModel(self.use_namespaces, network)
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def get_dhcp_port(self, network_id, device_id):
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"""Make a remote process call to get the dhcp port."""
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port = self.call(self.context,
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self.make_msg('get_dhcp_port',
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network_id=network_id,
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device_id=device_id,
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host=self.host),
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topic=self.topic)
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if port:
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return dhcp.DictModel(port)
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def create_dhcp_port(self, port):
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"""Make a remote process call to create the dhcp port."""
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port = self.call(self.context,
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self.make_msg('create_dhcp_port',
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port=port,
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host=self.host),
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topic=self.topic)
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if port:
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return dhcp.DictModel(port)
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def update_dhcp_port(self, port_id, port):
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"""Make a remote process call to update the dhcp port."""
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port = self.call(self.context,
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self.make_msg('update_dhcp_port',
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port_id=port_id,
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port=port,
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host=self.host),
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topic=self.topic)
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if port:
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return dhcp.DictModel(port)
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def release_dhcp_port(self, network_id, device_id):
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"""Make a remote process call to release the dhcp port."""
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return self.call(self.context,
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self.make_msg('release_dhcp_port',
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network_id=network_id,
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device_id=device_id,
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host=self.host),
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topic=self.topic)
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def release_port_fixed_ip(self, network_id, device_id, subnet_id):
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"""Make a remote process call to release a fixed_ip on the port."""
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return self.call(self.context,
|
|
self.make_msg('release_port_fixed_ip',
|
|
network_id=network_id,
|
|
subnet_id=subnet_id,
|
|
device_id=device_id,
|
|
host=self.host),
|
|
topic=self.topic)
|
|
|
|
|
|
class NetworkCache(object):
|
|
"""Agent cache of the current network state."""
|
|
def __init__(self):
|
|
self.cache = {}
|
|
self.subnet_lookup = {}
|
|
self.port_lookup = {}
|
|
|
|
def get_network_ids(self):
|
|
return self.cache.keys()
|
|
|
|
def get_network_by_id(self, network_id):
|
|
return self.cache.get(network_id)
|
|
|
|
def get_network_by_subnet_id(self, subnet_id):
|
|
return self.cache.get(self.subnet_lookup.get(subnet_id))
|
|
|
|
def get_network_by_port_id(self, port_id):
|
|
return self.cache.get(self.port_lookup.get(port_id))
|
|
|
|
def put(self, network):
|
|
if network.id in self.cache:
|
|
self.remove(self.cache[network.id])
|
|
|
|
self.cache[network.id] = network
|
|
|
|
for subnet in network.subnets:
|
|
self.subnet_lookup[subnet.id] = network.id
|
|
|
|
for port in network.ports:
|
|
self.port_lookup[port.id] = network.id
|
|
|
|
def remove(self, network):
|
|
del self.cache[network.id]
|
|
|
|
for subnet in network.subnets:
|
|
del self.subnet_lookup[subnet.id]
|
|
|
|
for port in network.ports:
|
|
del self.port_lookup[port.id]
|
|
|
|
def put_port(self, port):
|
|
network = self.get_network_by_id(port.network_id)
|
|
for index in range(len(network.ports)):
|
|
if network.ports[index].id == port.id:
|
|
network.ports[index] = port
|
|
break
|
|
else:
|
|
network.ports.append(port)
|
|
|
|
self.port_lookup[port.id] = network.id
|
|
|
|
def remove_port(self, port):
|
|
network = self.get_network_by_port_id(port.id)
|
|
|
|
for index in range(len(network.ports)):
|
|
if network.ports[index] == port:
|
|
del network.ports[index]
|
|
del self.port_lookup[port.id]
|
|
break
|
|
|
|
def get_port_by_id(self, port_id):
|
|
network = self.get_network_by_port_id(port_id)
|
|
if network:
|
|
for port in network.ports:
|
|
if port.id == port_id:
|
|
return port
|
|
|
|
def get_state(self):
|
|
net_ids = self.get_network_ids()
|
|
num_nets = len(net_ids)
|
|
num_subnets = 0
|
|
num_ports = 0
|
|
for net_id in net_ids:
|
|
network = self.get_network_by_id(net_id)
|
|
num_subnets += len(network.subnets)
|
|
num_ports += len(network.ports)
|
|
return {'networks': num_nets,
|
|
'subnets': num_subnets,
|
|
'ports': num_ports}
|
|
|
|
|
|
class DhcpAgentWithStateReport(DhcpAgent):
|
|
def __init__(self, host=None):
|
|
super(DhcpAgentWithStateReport, self).__init__(host=host)
|
|
self.state_rpc = agent_rpc.PluginReportStateAPI(topics.PLUGIN)
|
|
self.agent_state = {
|
|
'binary': 'neutron-dhcp-agent',
|
|
'host': host,
|
|
'topic': topics.DHCP_AGENT,
|
|
'configurations': {
|
|
'dhcp_driver': cfg.CONF.dhcp_driver,
|
|
'use_namespaces': cfg.CONF.use_namespaces,
|
|
'dhcp_lease_duration': cfg.CONF.dhcp_lease_duration},
|
|
'start_flag': True,
|
|
'agent_type': constants.AGENT_TYPE_DHCP}
|
|
report_interval = cfg.CONF.AGENT.report_interval
|
|
self.use_call = True
|
|
if report_interval:
|
|
self.heartbeat = loopingcall.FixedIntervalLoopingCall(
|
|
self._report_state)
|
|
self.heartbeat.start(interval=report_interval)
|
|
|
|
def _report_state(self):
|
|
try:
|
|
self.agent_state.get('configurations').update(
|
|
self.cache.get_state())
|
|
ctx = context.get_admin_context_without_session()
|
|
self.state_rpc.report_state(ctx, self.agent_state, self.use_call)
|
|
self.use_call = False
|
|
except AttributeError:
|
|
# This means the server does not support report_state
|
|
LOG.warn(_("Neutron server does not support state report."
|
|
" State report for this agent will be disabled."))
|
|
self.heartbeat.stop()
|
|
self.run()
|
|
return
|
|
except Exception:
|
|
LOG.exception(_("Failed reporting state!"))
|
|
return
|
|
if self.agent_state.pop('start_flag', None):
|
|
self.run()
|
|
|
|
def agent_updated(self, context, payload):
|
|
"""Handle the agent_updated notification event."""
|
|
self.needs_resync = True
|
|
LOG.info(_("agent_updated by server side %s!"), payload)
|
|
|
|
def after_start(self):
|
|
LOG.info(_("DHCP agent started"))
|
|
|
|
|
|
def register_options():
|
|
cfg.CONF.register_opts(DhcpAgent.OPTS)
|
|
config.register_agent_state_opts_helper(cfg.CONF)
|
|
config.register_root_helper(cfg.CONF)
|
|
cfg.CONF.register_opts(dhcp.OPTS)
|
|
cfg.CONF.register_opts(interface.OPTS)
|
|
|
|
|
|
def main():
|
|
eventlet.monkey_patch()
|
|
register_options()
|
|
cfg.CONF(project='neutron')
|
|
config.setup_logging(cfg.CONF)
|
|
legacy.modernize_quantum_config(cfg.CONF)
|
|
server = neutron_service.Service.create(
|
|
binary='neutron-dhcp-agent',
|
|
topic=topics.DHCP_AGENT,
|
|
report_interval=cfg.CONF.AGENT.report_interval,
|
|
manager='neutron.agent.dhcp_agent.DhcpAgentWithStateReport')
|
|
service.launch(server).wait()
|