b9d6bb031f
The following patch: 9569b2fe broke the desired functionality of
the enable_metadata_network flag, by not allowing the metadata
proxy to be spawn for 'metadata networks', which are used for
accessing the metadata service when the logical router is not
implemented through the l3 agent.
This patch enables spawning of the metadata proxy for metadata
networks when the appropriate flag is set to True.
The patch also adds rather pedant unit test coverage for the
should_enable_metadata method which previously had no unit test.
Change-Id: I8dca1fce9fbc83e75ba7e4ce948531427bf7e88b
Closes-bug: 1394020
628 lines
25 KiB
Python
628 lines
25 KiB
Python
# 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 collections
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import os
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import sys
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import eventlet
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eventlet.monkey_patch()
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from oslo.config import cfg
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from oslo import messaging
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from oslo.utils import importutils
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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.linux import ovs_lib # noqa
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from neutron.agent import rpc as agent_rpc
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from neutron.common import config as common_config
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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 rpc as n_rpc
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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.i18n import _LE, _LI, _LW
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from neutron import manager
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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 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('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_reasons = collections.defaultdict(list)
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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("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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def after_start(self):
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self.run()
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LOG.info(_LI("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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LOG.debug('Calling driver for network: %(net)s action: %(action)s',
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{'net': network.id, 'action': action})
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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(_LW('Unable to %(action)s dhcp for %(net_id)s: there '
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'is a conflict with its current state; please '
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'check that the network and/or its subnet(s) '
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'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.schedule_resync(e, network.id)
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if (isinstance(e, messaging.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(_LW("Network %s has been deleted."), network.id)
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else:
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LOG.exception(_LE('Unable to %(action)s dhcp for %(net_id)s.')
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% {'net_id': network.id, 'action': action})
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def schedule_resync(self, reason, network=None):
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"""Schedule a resync for a given network and reason. If no network is
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specified, resync all networks.
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"""
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self.needs_resync_reasons[network].append(reason)
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@utils.synchronized('dhcp-agent')
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def sync_state(self, networks=None):
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"""Sync the local DHCP state with Neutron. If no networks are passed,
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or 'None' is one of the networks, sync all of the networks.
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"""
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only_nets = set([] if (not networks or None in networks) else networks)
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LOG.info(_LI('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 as e:
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self.schedule_resync(e, deleted_id)
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LOG.exception(_LE('Unable to sync network state on '
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'deleted network %s'), deleted_id)
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for network in active_networks:
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if (not only_nets or # specifically resync all
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network.id not in known_network_ids or # missing net
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network.id in only_nets): # specific network to sync
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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(_LI('Synchronizing state complete'))
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except Exception as e:
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self.schedule_resync(e)
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LOG.exception(_LE('Unable to sync network state.'))
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@utils.exception_logger()
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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_reasons:
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# be careful to avoid a race with additions to list
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# from other threads
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reasons = self.needs_resync_reasons
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self.needs_resync_reasons = collections.defaultdict(list)
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for net, r in reasons.items():
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if not net:
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net = "*"
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LOG.debug("resync (%(network)s): %(reason)s",
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{"reason": r, "network": net})
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self.sync_state(reasons.keys())
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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(_LW('Network %s has been deleted.'), network_id)
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return network
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except Exception as e:
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self.schedule_resync(e, network_id)
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LOG.exception(_LE('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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@utils.exception_logger()
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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(_LW('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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enable_metadata = self.dhcp_driver_cls.should_enable_metadata(
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self.conf, network)
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dhcp_network_enabled = False
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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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dhcp_network_enabled = True
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self.cache.put(network)
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break
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if enable_metadata and dhcp_network_enabled:
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for subnet in network.subnets:
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if subnet.ip_version == 4 and subnet.enable_dhcp:
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self.enable_isolated_metadata_proxy(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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# NOTE(jschwarz): In the case where a network is deleted, all
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# the subnets and ports are deleted before this function is
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# called, so checking if 'should_enable_metadata' is True
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# for any subnet is false logic here.
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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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@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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self.cache.put_port(updated_port)
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self.call_driver('reload_allocations', 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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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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# When the metadata network is enabled, the proxy might
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# be started for the router attached to the network
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if self.conf.enable_metadata_network:
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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(_LW("%(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(object):
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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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def __init__(self, topic, context, use_namespaces):
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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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target = messaging.Target(topic=topic, version='1.0')
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self.client = n_rpc.get_client(target)
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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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cctxt = self.client.prepare(version='1.1')
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networks = cctxt.call(self.context, 'get_active_networks_info',
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host=self.host)
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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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cctxt = self.client.prepare()
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network = cctxt.call(self.context, 'get_network_info',
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network_id=network_id, host=self.host)
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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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cctxt = self.client.prepare()
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port = cctxt.call(self.context, 'get_dhcp_port',
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network_id=network_id, device_id=device_id,
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host=self.host)
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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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cctxt = self.client.prepare(version='1.1')
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port = cctxt.call(self.context, 'create_dhcp_port',
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port=port, host=self.host)
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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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cctxt = self.client.prepare(version='1.1')
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port = cctxt.call(self.context, 'update_dhcp_port',
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port_id=port_id, port=port, host=self.host)
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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):
|
|
"""Make a remote process call to release the dhcp port."""
|
|
cctxt = self.client.prepare()
|
|
return cctxt.call(self.context, 'release_dhcp_port',
|
|
network_id=network_id, device_id=device_id,
|
|
host=self.host)
|
|
|
|
def release_port_fixed_ip(self, network_id, device_id, subnet_id):
|
|
"""Make a remote process call to release a fixed_ip on the port."""
|
|
cctxt = self.client.prepare()
|
|
return cctxt.call(self.context, 'release_port_fixed_ip',
|
|
network_id=network_id, subnet_id=subnet_id,
|
|
device_id=device_id, host=self.host)
|
|
|
|
|
|
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(_LW("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(_LE("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.schedule_resync(_("Agent updated: %(payload)s") %
|
|
{"payload": payload})
|
|
LOG.info(_LI("agent_updated by server side %s!"), payload)
|
|
|
|
def after_start(self):
|
|
LOG.info(_LI("DHCP agent started"))
|
|
|
|
|
|
def register_options():
|
|
cfg.CONF.register_opts(DhcpAgent.OPTS)
|
|
config.register_interface_driver_opts_helper(cfg.CONF)
|
|
config.register_use_namespaces_opts_helper(cfg.CONF)
|
|
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():
|
|
register_options()
|
|
common_config.init(sys.argv[1:])
|
|
config.setup_logging()
|
|
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()
|