631 lines
27 KiB
Python
631 lines
27 KiB
Python
# Copyright (C) 2014 eNovance SAS <licensing@enovance.com>
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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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#
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import netaddr
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from oslo_config import cfg
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from oslo_db import exception as db_exc
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from oslo_log import log as logging
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from oslo_utils import excutils
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import sqlalchemy as sa
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from sqlalchemy import orm
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from neutron._i18n import _, _LI
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from neutron.api.v2 import attributes
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from neutron.common import constants
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from neutron.common import exceptions as n_exc
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from neutron.common import utils as n_utils
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from neutron.db import agents_db
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from neutron.db.availability_zone import router as router_az_db
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from neutron.db import l3_attrs_db
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from neutron.db import l3_db
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from neutron.db import l3_dvr_db
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from neutron.db import model_base
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from neutron.db import models_v2
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from neutron.extensions import l3_ext_ha_mode as l3_ha
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from neutron.extensions import portbindings
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from neutron.extensions import providernet
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from neutron.plugins.common import utils as p_utils
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VR_ID_RANGE = set(range(1, 255))
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MAX_ALLOCATION_TRIES = 10
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UNLIMITED_AGENTS_PER_ROUTER = 0
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LOG = logging.getLogger(__name__)
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L3_HA_OPTS = [
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cfg.BoolOpt('l3_ha',
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default=False,
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help=_('Enable HA mode for virtual routers.')),
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cfg.IntOpt('max_l3_agents_per_router',
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default=3,
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help=_("Maximum number of L3 agents which a HA router will be "
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"scheduled on. If it is set to 0 then the router will "
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"be scheduled on every agent.")),
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cfg.IntOpt('min_l3_agents_per_router',
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default=constants.MINIMUM_AGENTS_FOR_HA,
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help=_("Minimum number of L3 agents which a HA router will be "
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"scheduled on. If it is set to 0 then the router will "
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"be scheduled on every agent.")),
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cfg.StrOpt('l3_ha_net_cidr',
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default='169.254.192.0/18',
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help=_('Subnet used for the l3 HA admin network.')),
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cfg.StrOpt('l3_ha_network_type', default='',
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help=_("The network type to use when creating the HA network "
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"for an HA router. By default or if empty, the first "
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"'tenant_network_types' is used. This is helpful when "
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"the VRRP traffic should use a specific network which "
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"is not the default one.")),
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cfg.StrOpt('l3_ha_network_physical_name', default='',
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help=_("The physical network name with which the HA network "
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"can be created."))
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]
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cfg.CONF.register_opts(L3_HA_OPTS)
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class L3HARouterAgentPortBinding(model_base.BASEV2):
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"""Represent agent binding state of a HA router port.
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A HA Router has one HA port per agent on which it is spawned.
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This binding table stores which port is used for a HA router by a
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L3 agent.
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"""
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__tablename__ = 'ha_router_agent_port_bindings'
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port_id = sa.Column(sa.String(36), sa.ForeignKey('ports.id',
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ondelete='CASCADE'),
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nullable=False, primary_key=True)
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port = orm.relationship(models_v2.Port)
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router_id = sa.Column(sa.String(36), sa.ForeignKey('routers.id',
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ondelete='CASCADE'),
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nullable=False)
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l3_agent_id = sa.Column(sa.String(36),
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sa.ForeignKey("agents.id",
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ondelete='CASCADE'))
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agent = orm.relationship(agents_db.Agent)
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state = sa.Column(sa.Enum(constants.HA_ROUTER_STATE_ACTIVE,
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constants.HA_ROUTER_STATE_STANDBY,
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name='l3_ha_states'),
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default=constants.HA_ROUTER_STATE_STANDBY,
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server_default=constants.HA_ROUTER_STATE_STANDBY)
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class L3HARouterNetwork(model_base.BASEV2):
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"""Host HA network for a tenant.
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One HA Network is used per tenant, all HA router ports are created
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on this network.
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"""
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__tablename__ = 'ha_router_networks'
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tenant_id = sa.Column(sa.String(attributes.TENANT_ID_MAX_LEN),
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primary_key=True, nullable=False)
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network_id = sa.Column(sa.String(36),
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sa.ForeignKey('networks.id', ondelete="CASCADE"),
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nullable=False, primary_key=True)
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network = orm.relationship(models_v2.Network)
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class L3HARouterVRIdAllocation(model_base.BASEV2):
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"""VRID allocation per HA network.
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Keep a track of the VRID allocations per HA network.
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"""
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__tablename__ = 'ha_router_vrid_allocations'
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network_id = sa.Column(sa.String(36),
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sa.ForeignKey('networks.id', ondelete="CASCADE"),
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nullable=False, primary_key=True)
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vr_id = sa.Column(sa.Integer(), nullable=False, primary_key=True)
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class L3_HA_NAT_db_mixin(l3_dvr_db.L3_NAT_with_dvr_db_mixin,
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router_az_db.RouterAvailabilityZoneMixin):
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"""Mixin class to add high availability capability to routers."""
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extra_attributes = (
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l3_dvr_db.L3_NAT_with_dvr_db_mixin.extra_attributes +
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router_az_db.RouterAvailabilityZoneMixin.extra_attributes + [
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{'name': 'ha', 'default': cfg.CONF.l3_ha},
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{'name': 'ha_vr_id', 'default': 0}])
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def _verify_configuration(self):
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self.ha_cidr = cfg.CONF.l3_ha_net_cidr
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try:
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net = netaddr.IPNetwork(self.ha_cidr)
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except netaddr.AddrFormatError:
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raise l3_ha.HANetworkCIDRNotValid(cidr=self.ha_cidr)
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if ('/' not in self.ha_cidr or net.network != net.ip):
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raise l3_ha.HANetworkCIDRNotValid(cidr=self.ha_cidr)
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self._check_num_agents_per_router()
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def _check_num_agents_per_router(self):
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max_agents = cfg.CONF.max_l3_agents_per_router
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min_agents = cfg.CONF.min_l3_agents_per_router
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if (max_agents != UNLIMITED_AGENTS_PER_ROUTER
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and max_agents < min_agents):
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raise l3_ha.HAMaximumAgentsNumberNotValid(
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max_agents=max_agents, min_agents=min_agents)
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if min_agents < constants.MINIMUM_AGENTS_FOR_HA:
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raise l3_ha.HAMinimumAgentsNumberNotValid()
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def __init__(self):
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self._verify_configuration()
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super(L3_HA_NAT_db_mixin, self).__init__()
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def get_ha_network(self, context, tenant_id):
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return (context.session.query(L3HARouterNetwork).
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filter(L3HARouterNetwork.tenant_id == tenant_id).
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first())
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def _get_allocated_vr_id(self, context, network_id):
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with context.session.begin(subtransactions=True):
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query = (context.session.query(L3HARouterVRIdAllocation).
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filter(L3HARouterVRIdAllocation.network_id == network_id))
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allocated_vr_ids = set(a.vr_id for a in query) - set([0])
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return allocated_vr_ids
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def _allocate_vr_id(self, context, network_id, router_id):
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for count in range(MAX_ALLOCATION_TRIES):
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try:
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with context.session.begin(subtransactions=True):
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allocated_vr_ids = self._get_allocated_vr_id(context,
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network_id)
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available_vr_ids = VR_ID_RANGE - allocated_vr_ids
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if not available_vr_ids:
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raise l3_ha.NoVRIDAvailable(router_id=router_id)
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allocation = L3HARouterVRIdAllocation()
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allocation.network_id = network_id
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allocation.vr_id = available_vr_ids.pop()
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context.session.add(allocation)
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return allocation.vr_id
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except db_exc.DBDuplicateEntry:
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LOG.info(_LI("Attempt %(count)s to allocate a VRID in the "
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"network %(network)s for the router %(router)s"),
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{'count': count, 'network': network_id,
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'router': router_id})
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raise l3_ha.MaxVRIDAllocationTriesReached(
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network_id=network_id, router_id=router_id,
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max_tries=MAX_ALLOCATION_TRIES)
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def _delete_vr_id_allocation(self, context, ha_network, vr_id):
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with context.session.begin(subtransactions=True):
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context.session.query(L3HARouterVRIdAllocation).filter_by(
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network_id=ha_network.network_id,
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vr_id=vr_id).delete()
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def _set_vr_id(self, context, router, ha_network):
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with context.session.begin(subtransactions=True):
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router.extra_attributes.ha_vr_id = self._allocate_vr_id(
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context, ha_network.network_id, router.id)
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def _create_ha_subnet(self, context, network_id, tenant_id):
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args = {'network_id': network_id,
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'tenant_id': '',
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'name': constants.HA_SUBNET_NAME % tenant_id,
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'ip_version': 4,
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'cidr': cfg.CONF.l3_ha_net_cidr,
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'enable_dhcp': False,
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'gateway_ip': None}
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return p_utils.create_subnet(self._core_plugin, context,
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{'subnet': args})
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def _create_ha_network_tenant_binding(self, context, tenant_id,
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network_id):
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with context.session.begin(subtransactions=True):
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ha_network = L3HARouterNetwork(tenant_id=tenant_id,
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network_id=network_id)
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context.session.add(ha_network)
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return ha_network
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def _add_ha_network_settings(self, network):
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if cfg.CONF.l3_ha_network_type:
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network[providernet.NETWORK_TYPE] = cfg.CONF.l3_ha_network_type
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if cfg.CONF.l3_ha_network_physical_name:
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network[providernet.PHYSICAL_NETWORK] = (
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cfg.CONF.l3_ha_network_physical_name)
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def _create_ha_network(self, context, tenant_id):
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admin_ctx = context.elevated()
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args = {'network':
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{'name': constants.HA_NETWORK_NAME % tenant_id,
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'tenant_id': '',
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'shared': False,
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'admin_state_up': True}}
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self._add_ha_network_settings(args['network'])
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network = p_utils.create_network(self._core_plugin, admin_ctx, args)
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try:
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ha_network = self._create_ha_network_tenant_binding(admin_ctx,
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tenant_id,
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network['id'])
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except Exception:
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with excutils.save_and_reraise_exception():
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self._core_plugin.delete_network(admin_ctx, network['id'])
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try:
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self._create_ha_subnet(admin_ctx, network['id'], tenant_id)
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except Exception:
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with excutils.save_and_reraise_exception():
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self._core_plugin.delete_network(admin_ctx, network['id'])
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return ha_network
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def get_number_of_agents_for_scheduling(self, context):
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"""Return the number of agents on which the router will be scheduled.
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Raises an exception if there are not enough agents available to honor
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the min_agents config parameter. If the max_agents parameter is set to
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0 all the agents will be used.
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"""
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min_agents = cfg.CONF.min_l3_agents_per_router
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num_agents = len(self.get_l3_agents(context, active=True,
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filters={'agent_modes': [constants.L3_AGENT_MODE_LEGACY,
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constants.L3_AGENT_MODE_DVR_SNAT]}))
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max_agents = cfg.CONF.max_l3_agents_per_router
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if max_agents:
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if max_agents > num_agents:
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LOG.info(_LI("Number of active agents lower than "
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"max_l3_agents_per_router. L3 agents "
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"available: %s"), num_agents)
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else:
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num_agents = max_agents
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if num_agents < min_agents:
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raise l3_ha.HANotEnoughAvailableAgents(min_agents=min_agents,
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num_agents=num_agents)
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return num_agents
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def _create_ha_port_binding(self, context, port_id, router_id):
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with context.session.begin(subtransactions=True):
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portbinding = L3HARouterAgentPortBinding(port_id=port_id,
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router_id=router_id)
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context.session.add(portbinding)
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return portbinding
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def add_ha_port(self, context, router_id, network_id, tenant_id):
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args = {'tenant_id': '',
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'network_id': network_id,
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'admin_state_up': True,
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'device_id': router_id,
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'device_owner': constants.DEVICE_OWNER_ROUTER_HA_INTF,
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'name': constants.HA_PORT_NAME % tenant_id}
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port = p_utils.create_port(self._core_plugin, context,
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{'port': args})
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try:
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return self._create_ha_port_binding(context, port['id'], router_id)
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except Exception:
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with excutils.save_and_reraise_exception():
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self._core_plugin.delete_port(context, port['id'],
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l3_port_check=False)
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def _create_ha_interfaces(self, context, router, ha_network):
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admin_ctx = context.elevated()
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num_agents = self.get_number_of_agents_for_scheduling(context)
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port_ids = []
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try:
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for index in range(num_agents):
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binding = self.add_ha_port(admin_ctx, router.id,
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ha_network.network['id'],
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router.tenant_id)
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port_ids.append(binding.port_id)
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except Exception:
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with excutils.save_and_reraise_exception():
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for port_id in port_ids:
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self._core_plugin.delete_port(admin_ctx, port_id,
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l3_port_check=False)
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def _delete_ha_interfaces(self, context, router_id):
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admin_ctx = context.elevated()
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device_filter = {'device_id': [router_id],
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'device_owner':
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[constants.DEVICE_OWNER_ROUTER_HA_INTF]}
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ports = self._core_plugin.get_ports(admin_ctx, filters=device_filter)
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for port in ports:
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self._core_plugin.delete_port(admin_ctx, port['id'],
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l3_port_check=False)
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def delete_ha_interfaces_on_host(self, context, router_id, host):
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admin_ctx = context.elevated()
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port_ids = (binding.port_id for binding
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in self.get_ha_router_port_bindings(admin_ctx,
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[router_id], host))
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for port_id in port_ids:
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self._core_plugin.delete_port(admin_ctx, port_id,
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l3_port_check=False)
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def _notify_ha_interfaces_updated(self, context, router_id):
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self.l3_rpc_notifier.routers_updated(
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context, [router_id], shuffle_agents=True)
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@classmethod
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def _is_ha(cls, router):
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ha = router.get('ha')
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if not attributes.is_attr_set(ha):
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ha = cfg.CONF.l3_ha
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return ha
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def create_router(self, context, router):
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is_ha = self._is_ha(router['router'])
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if is_ha and l3_dvr_db.is_distributed_router(router['router']):
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raise l3_ha.DistributedHARouterNotSupported()
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router['router']['ha'] = is_ha
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router_dict = super(L3_HA_NAT_db_mixin,
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self).create_router(context, router)
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if is_ha:
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try:
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router_db = self._get_router(context, router_dict['id'])
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ha_network = self.get_ha_network(context,
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router_db.tenant_id)
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if not ha_network:
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ha_network = self._create_ha_network(context,
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router_db.tenant_id)
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self._set_vr_id(context, router_db, ha_network)
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self._create_ha_interfaces(context, router_db, ha_network)
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self._notify_ha_interfaces_updated(context, router_db.id)
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except Exception:
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with excutils.save_and_reraise_exception():
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self.delete_router(context, router_dict['id'])
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router_dict['ha_vr_id'] = router_db.extra_attributes.ha_vr_id
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return router_dict
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def _update_router_db(self, context, router_id, data):
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router_db = self._get_router(context, router_id)
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original_distributed_state = router_db.extra_attributes.distributed
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original_ha_state = router_db.extra_attributes.ha
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requested_ha_state = data.pop('ha', None)
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requested_distributed_state = data.get('distributed', None)
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if ((original_ha_state and requested_distributed_state) or
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(requested_ha_state and original_distributed_state) or
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(requested_ha_state and requested_distributed_state)):
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raise l3_ha.DistributedHARouterNotSupported()
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with context.session.begin(subtransactions=True):
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router_db = super(L3_HA_NAT_db_mixin, self)._update_router_db(
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context, router_id, data)
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ha_not_changed = (requested_ha_state is None or
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requested_ha_state == original_ha_state)
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if ha_not_changed:
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return router_db
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if router_db.admin_state_up:
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msg = _('Cannot change HA attribute of active routers. Please '
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'set router admin_state_up to False prior to upgrade.')
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raise n_exc.BadRequest(resource='router', msg=msg)
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ha_network = self.get_ha_network(context,
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router_db.tenant_id)
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router_db.extra_attributes.ha = requested_ha_state
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if not requested_ha_state:
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self._delete_vr_id_allocation(
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context, ha_network, router_db.extra_attributes.ha_vr_id)
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router_db.extra_attributes.ha_vr_id = None
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# The HA attribute has changed. First unbind the router from agents
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# to force a proper re-scheduling to agents.
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# TODO(jschwarz): This will have to be more selective to get HA + DVR
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# working (Only unbind from dvr_snat nodes).
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self._unbind_ha_router(context, router_id)
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if requested_ha_state:
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if not ha_network:
|
|
ha_network = self._create_ha_network(context,
|
|
router_db.tenant_id)
|
|
|
|
self._set_vr_id(context, router_db, ha_network)
|
|
self._create_ha_interfaces(context, router_db, ha_network)
|
|
self._notify_ha_interfaces_updated(context, router_db.id)
|
|
else:
|
|
self._delete_ha_interfaces(context, router_db.id)
|
|
self._notify_ha_interfaces_updated(context, router_db.id)
|
|
|
|
return router_db
|
|
|
|
def _delete_ha_network(self, context, net):
|
|
admin_ctx = context.elevated()
|
|
self._core_plugin.delete_network(admin_ctx, net.network_id)
|
|
|
|
def _ha_routers_present(self, context, tenant_id):
|
|
ha = True
|
|
routers = context.session.query(l3_db.Router).filter(
|
|
l3_db.Router.tenant_id == tenant_id).subquery()
|
|
ha_routers = context.session.query(
|
|
l3_attrs_db.RouterExtraAttributes).join(
|
|
routers,
|
|
l3_attrs_db.RouterExtraAttributes.router_id == routers.c.id
|
|
).filter(l3_attrs_db.RouterExtraAttributes.ha == ha).first()
|
|
return ha_routers is not None
|
|
|
|
def delete_router(self, context, id):
|
|
router_db = self._get_router(context, id)
|
|
super(L3_HA_NAT_db_mixin, self).delete_router(context, id)
|
|
|
|
if router_db.extra_attributes.ha:
|
|
ha_network = self.get_ha_network(context,
|
|
router_db.tenant_id)
|
|
if ha_network:
|
|
self._delete_vr_id_allocation(
|
|
context, ha_network, router_db.extra_attributes.ha_vr_id)
|
|
self._delete_ha_interfaces(context, router_db.id)
|
|
|
|
# In case that create HA router failed because of the failure
|
|
# in HA network creation. So here put this deleting HA network
|
|
# procedure under 'if ha_network' block.
|
|
if not self._ha_routers_present(context,
|
|
router_db.tenant_id):
|
|
try:
|
|
self._delete_ha_network(context, ha_network)
|
|
except (n_exc.NetworkNotFound,
|
|
orm.exc.ObjectDeletedError):
|
|
LOG.debug(
|
|
"HA network for tenant %s was already deleted.",
|
|
router_db.tenant_id)
|
|
except sa.exc.InvalidRequestError:
|
|
LOG.info(_LI("HA network %s can not be deleted."),
|
|
ha_network.network_id)
|
|
except n_exc.NetworkInUse:
|
|
LOG.debug("HA network %s is still in use.",
|
|
ha_network.network_id)
|
|
else:
|
|
LOG.info(_LI("HA network %(network)s was deleted as "
|
|
"no HA routers are present in tenant "
|
|
"%(tenant)s."),
|
|
{'network': ha_network.network_id,
|
|
'tenant': router_db.tenant_id})
|
|
|
|
def _unbind_ha_router(self, context, router_id):
|
|
for agent in self.get_l3_agents_hosting_routers(context, [router_id]):
|
|
self.remove_router_from_l3_agent(context, agent['id'], router_id)
|
|
|
|
def get_ha_router_port_bindings(self, context, router_ids, host=None):
|
|
if not router_ids:
|
|
return []
|
|
query = context.session.query(L3HARouterAgentPortBinding)
|
|
|
|
if host:
|
|
query = query.join(agents_db.Agent).filter(
|
|
agents_db.Agent.host == host)
|
|
|
|
query = query.filter(
|
|
L3HARouterAgentPortBinding.router_id.in_(router_ids))
|
|
|
|
return query.all()
|
|
|
|
def get_l3_bindings_hosting_router_with_ha_states(
|
|
self, context, router_id):
|
|
"""Return a list of [(agent, ha_state), ...]."""
|
|
bindings = self.get_ha_router_port_bindings(context, [router_id])
|
|
return [(binding.agent, binding.state) for binding in bindings
|
|
if binding.agent is not None]
|
|
|
|
def get_active_host_for_ha_router(self, context, router_id):
|
|
bindings = self.get_l3_bindings_hosting_router_with_ha_states(
|
|
context, router_id)
|
|
# TODO(amuller): In case we have two or more actives, this method
|
|
# needs to return the last agent to become active. This requires
|
|
# timestamps for state changes. Otherwise, if a host goes down
|
|
# and another takes over, we'll have two actives. In this case,
|
|
# if an interface is added to a router, its binding might be wrong
|
|
# and l2pop would not work correctly.
|
|
return next(
|
|
(agent.host for agent, state in bindings
|
|
if state == constants.HA_ROUTER_STATE_ACTIVE),
|
|
None)
|
|
|
|
def _process_sync_ha_data(self, context, routers, host):
|
|
routers_dict = dict((router['id'], router) for router in routers)
|
|
|
|
bindings = self.get_ha_router_port_bindings(context,
|
|
routers_dict.keys(),
|
|
host)
|
|
for binding in bindings:
|
|
port_dict = self._core_plugin._make_port_dict(binding.port)
|
|
|
|
router = routers_dict.get(binding.router_id)
|
|
router[constants.HA_INTERFACE_KEY] = port_dict
|
|
router[constants.HA_ROUTER_STATE_KEY] = binding.state
|
|
|
|
for router in routers_dict.values():
|
|
interface = router.get(constants.HA_INTERFACE_KEY)
|
|
if interface:
|
|
self._populate_subnets_for_ports(context, [interface])
|
|
|
|
return list(routers_dict.values())
|
|
|
|
def get_ha_sync_data_for_host(self, context, host=None, router_ids=None,
|
|
active=None):
|
|
if n_utils.is_extension_supported(self,
|
|
constants.L3_DISTRIBUTED_EXT_ALIAS):
|
|
# DVR has to be handled differently
|
|
agent = self._get_agent_by_type_and_host(context,
|
|
constants.AGENT_TYPE_L3,
|
|
host)
|
|
sync_data = self._get_dvr_sync_data(context, host, agent,
|
|
router_ids, active)
|
|
else:
|
|
sync_data = super(L3_HA_NAT_db_mixin, self).get_sync_data(context,
|
|
router_ids, active)
|
|
return self._process_sync_ha_data(context, sync_data, host)
|
|
|
|
@classmethod
|
|
def _set_router_states(cls, context, bindings, states):
|
|
for binding in bindings:
|
|
try:
|
|
with context.session.begin(subtransactions=True):
|
|
binding.state = states[binding.router_id]
|
|
except (orm.exc.StaleDataError, orm.exc.ObjectDeletedError):
|
|
# Take concurrently deleted routers in to account
|
|
pass
|
|
|
|
def update_routers_states(self, context, states, host):
|
|
"""Receive dict of router ID to state and update them all."""
|
|
|
|
bindings = self.get_ha_router_port_bindings(
|
|
context, router_ids=states.keys(), host=host)
|
|
self._set_router_states(context, bindings, states)
|
|
self._update_router_port_bindings(context, states, host)
|
|
|
|
def _update_router_port_bindings(self, context, states, host):
|
|
admin_ctx = context.elevated()
|
|
device_filter = {'device_id': states.keys(),
|
|
'device_owner':
|
|
[constants.DEVICE_OWNER_ROUTER_INTF]}
|
|
ports = self._core_plugin.get_ports(admin_ctx, filters=device_filter)
|
|
active_ports = (port for port in ports
|
|
if states[port['device_id']] == constants.HA_ROUTER_STATE_ACTIVE)
|
|
|
|
for port in active_ports:
|
|
port[portbindings.HOST_ID] = host
|
|
try:
|
|
self._core_plugin.update_port(admin_ctx, port['id'],
|
|
{attributes.PORT: port})
|
|
except (orm.exc.StaleDataError, orm.exc.ObjectDeletedError):
|
|
# Take concurrently deleted interfaces in to account
|
|
pass
|