neutron/neutron/db/models_v2.py
Aaron Rosen d9832282cf Remove DHCP lease logic
Previously neutron was keeping track of dhcp lease time in order
to ensure it didn't hand out an ip address that was already leased.
This patch removes that logic and instead leverages the dhcp_release
utility. This allows us to reuse ip addresses immediately after a port
is deleted. This patch also bumps the lease time to 24 hours instead
of 2 minutes with reduces the amount of dhcp traffic.

DocImpact

There is a DocImpact for this bug related to the upgrade path. One should
first upgrade their dhcp-agents. Then wait till the dhcp_lease time has
expired. Lastly, update neutron-server in order to avoid the case where
an instance is deleted and the dnsmasq process has not released the lease
and neturon allocates that ip to a new port.

Fixes bug: 1202392
Implements blueprint: remove-dhcp-lease

Change-Id: Ifcb4f093c92904ceb896438987d53e692eb7fb26
2013-08-12 16:55:48 -07:00

178 lines
6.7 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2012 OpenStack Foundation.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import sqlalchemy as sa
from sqlalchemy import orm
from neutron.db import model_base
from neutron.openstack.common import uuidutils
class HasTenant(object):
"""Tenant mixin, add to subclasses that have a tenant."""
# NOTE(jkoelker) tenant_id is just a free form string ;(
tenant_id = sa.Column(sa.String(255))
class HasId(object):
"""id mixin, add to subclasses that have an id."""
id = sa.Column(sa.String(36),
primary_key=True,
default=uuidutils.generate_uuid)
class HasStatusDescription(object):
"""Status with description mixin."""
status = sa.Column(sa.String(16), nullable=False)
status_description = sa.Column(sa.String(255))
class IPAvailabilityRange(model_base.BASEV2):
"""Internal representation of available IPs for Neutron subnets.
Allocation - first entry from the range will be allocated.
If the first entry is equal to the last entry then this row
will be deleted.
Recycling ips involves appending to existing ranges. This is
only done if the range is contiguous. If not, the first_ip will be
the same as the last_ip. When adjacent ips are recycled the ranges
will be merged.
"""
allocation_pool_id = sa.Column(sa.String(36),
sa.ForeignKey('ipallocationpools.id',
ondelete="CASCADE"),
nullable=False,
primary_key=True)
first_ip = sa.Column(sa.String(64), nullable=False, primary_key=True)
last_ip = sa.Column(sa.String(64), nullable=False, primary_key=True)
def __repr__(self):
return "%s - %s" % (self.first_ip, self.last_ip)
class IPAllocationPool(model_base.BASEV2, HasId):
"""Representation of an allocation pool in a Neutron subnet."""
subnet_id = sa.Column(sa.String(36), sa.ForeignKey('subnets.id',
ondelete="CASCADE"),
nullable=True)
first_ip = sa.Column(sa.String(64), nullable=False)
last_ip = sa.Column(sa.String(64), nullable=False)
available_ranges = orm.relationship(IPAvailabilityRange,
backref='ipallocationpool',
lazy="joined",
cascade='delete')
def __repr__(self):
return "%s - %s" % (self.first_ip, self.last_ip)
class IPAllocation(model_base.BASEV2):
"""Internal representation of allocated IP addresses in a Neutron subnet.
"""
port_id = sa.Column(sa.String(36), sa.ForeignKey('ports.id',
ondelete="CASCADE"),
nullable=True)
ip_address = sa.Column(sa.String(64), nullable=False, primary_key=True)
subnet_id = sa.Column(sa.String(36), sa.ForeignKey('subnets.id',
ondelete="CASCADE"),
nullable=False, primary_key=True)
network_id = sa.Column(sa.String(36), sa.ForeignKey("networks.id",
ondelete="CASCADE"),
nullable=False, primary_key=True)
class Route(object):
"""mixin of a route."""
destination = sa.Column(sa.String(64), nullable=False, primary_key=True)
nexthop = sa.Column(sa.String(64), nullable=False, primary_key=True)
class SubnetRoute(model_base.BASEV2, Route):
subnet_id = sa.Column(sa.String(36),
sa.ForeignKey('subnets.id',
ondelete="CASCADE"),
primary_key=True)
class Port(model_base.BASEV2, HasId, HasTenant):
"""Represents a port on a Neutron v2 network."""
name = sa.Column(sa.String(255))
network_id = sa.Column(sa.String(36), sa.ForeignKey("networks.id"),
nullable=False)
fixed_ips = orm.relationship(IPAllocation, backref='ports', lazy='joined')
mac_address = sa.Column(sa.String(32), nullable=False)
admin_state_up = sa.Column(sa.Boolean(), nullable=False)
status = sa.Column(sa.String(16), nullable=False)
device_id = sa.Column(sa.String(255), nullable=False)
device_owner = sa.Column(sa.String(255), nullable=False)
class DNSNameServer(model_base.BASEV2):
"""Internal representation of a DNS nameserver."""
address = sa.Column(sa.String(128), nullable=False, primary_key=True)
subnet_id = sa.Column(sa.String(36),
sa.ForeignKey('subnets.id',
ondelete="CASCADE"),
primary_key=True)
class Subnet(model_base.BASEV2, HasId, HasTenant):
"""Represents a neutron subnet.
When a subnet is created the first and last entries will be created. These
are used for the IP allocation.
"""
name = sa.Column(sa.String(255))
network_id = sa.Column(sa.String(36), sa.ForeignKey('networks.id'))
ip_version = sa.Column(sa.Integer, nullable=False)
cidr = sa.Column(sa.String(64), nullable=False)
gateway_ip = sa.Column(sa.String(64))
allocation_pools = orm.relationship(IPAllocationPool,
backref='subnet',
lazy="joined",
cascade='delete')
enable_dhcp = sa.Column(sa.Boolean())
dns_nameservers = orm.relationship(DNSNameServer,
backref='subnet',
cascade='all, delete, delete-orphan')
routes = orm.relationship(SubnetRoute,
backref='subnet',
cascade='all, delete, delete-orphan')
shared = sa.Column(sa.Boolean)
class Network(model_base.BASEV2, HasId, HasTenant):
"""Represents a v2 neutron network."""
name = sa.Column(sa.String(255))
ports = orm.relationship(Port, backref='networks')
subnets = orm.relationship(Subnet, backref='networks')
status = sa.Column(sa.String(16))
admin_state_up = sa.Column(sa.Boolean)
shared = sa.Column(sa.Boolean)