a0fd44c6f3
Some configuration parameters used in neutron.agent.linux.utils were missing. The namespace attribute in the FakeNetwork object was missing, and used in neutron.agent.linux.dhcp. Also, the plugin object was missing for release_dhcp_port operation. We provide a fake plugin object to accept current and any future plugin calls as this is meant to be an standalone tool that should work without any RPC connectivity. FakeNetwork was switched for neutron.agent.linux.dhcp.NetModel to follow any future changes in NetModel. Two wrong called_once_with_args calls without assert were fixed. Change-Id: Ia51ea9bd4c8eea6b250858964ad5286c933702e0 Closes-Bug: #1291915 Partial-Bug: #1297875
177 lines
5.8 KiB
Python
177 lines
5.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 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 re
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import eventlet
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from oslo.config import cfg
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from neutron.agent.common import config as agent_config
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from neutron.agent import dhcp_agent
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from neutron.agent import l3_agent
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from neutron.agent.linux import dhcp
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from neutron.agent.linux import interface
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from neutron.agent.linux import ip_lib
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from neutron.agent.linux import ovs_lib
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from neutron.api.v2 import attributes
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from neutron.common import config
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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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LOG = logging.getLogger(__name__)
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NS_MANGLING_PATTERN = ('(%s|%s)' % (dhcp.NS_PREFIX, l3_agent.NS_PREFIX) +
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attributes.UUID_PATTERN)
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class FakeDhcpPlugin(object):
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"""Fake RPC plugin to bypass any RPC calls."""
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def __getattribute__(self, name):
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def fake_method(*args):
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pass
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return fake_method
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def setup_conf():
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"""Setup the cfg for the clean up utility.
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Use separate setup_conf for the utility because there are many options
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from the main config that do not apply during clean-up.
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"""
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cli_opts = [
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cfg.BoolOpt('force',
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default=False,
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help=_('Delete the namespace by removing all devices.')),
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]
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conf = cfg.CONF
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conf.register_cli_opts(cli_opts)
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agent_config.register_interface_driver_opts_helper(conf)
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agent_config.register_use_namespaces_opts_helper(conf)
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agent_config.register_root_helper(conf)
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conf.register_opts(dhcp.OPTS)
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conf.register_opts(dhcp_agent.DhcpAgent.OPTS)
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conf.register_opts(interface.OPTS)
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return conf
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def kill_dhcp(conf, namespace):
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"""Disable DHCP for a network if DHCP is still active."""
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root_helper = agent_config.get_root_helper(conf)
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network_id = namespace.replace(dhcp.NS_PREFIX, '')
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dhcp_driver = importutils.import_object(
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conf.dhcp_driver,
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conf=conf,
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network=dhcp.NetModel(conf.use_namespaces, {'id': network_id}),
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root_helper=root_helper,
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plugin=FakeDhcpPlugin())
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if dhcp_driver.active:
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dhcp_driver.disable()
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def eligible_for_deletion(conf, namespace, force=False):
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"""Determine whether a namespace is eligible for deletion.
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Eligibility is determined by having only the lo device or if force
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is passed as a parameter.
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"""
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# filter out namespaces without UUID as the name
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if not re.match(NS_MANGLING_PATTERN, namespace):
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return False
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root_helper = agent_config.get_root_helper(conf)
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ip = ip_lib.IPWrapper(root_helper, namespace)
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return force or ip.namespace_is_empty()
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def unplug_device(conf, device):
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try:
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device.link.delete()
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except RuntimeError:
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root_helper = agent_config.get_root_helper(conf)
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# Maybe the device is OVS port, so try to delete
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bridge_name = ovs_lib.get_bridge_for_iface(root_helper, device.name)
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if bridge_name:
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bridge = ovs_lib.OVSBridge(bridge_name, root_helper)
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bridge.delete_port(device.name)
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else:
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LOG.debug(_('Unable to find bridge for device: %s'), device.name)
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def destroy_namespace(conf, namespace, force=False):
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"""Destroy a given namespace.
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If force is True, then dhcp (if it exists) will be disabled and all
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devices will be forcibly removed.
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"""
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try:
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root_helper = agent_config.get_root_helper(conf)
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ip = ip_lib.IPWrapper(root_helper, namespace)
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if force:
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kill_dhcp(conf, namespace)
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# NOTE: The dhcp driver will remove the namespace if is it empty,
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# so a second check is required here.
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if ip.netns.exists(namespace):
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for device in ip.get_devices(exclude_loopback=True):
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unplug_device(conf, device)
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ip.garbage_collect_namespace()
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except Exception:
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LOG.exception(_('Error unable to destroy namespace: %s'), namespace)
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def main():
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"""Main method for cleaning up network namespaces.
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This method will make two passes checking for namespaces to delete. The
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process will identify candidates, sleep, and call garbage collect. The
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garbage collection will re-verify that the namespace meets the criteria for
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deletion (ie it is empty). The period of sleep and the 2nd pass allow
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time for the namespace state to settle, so that the check prior deletion
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will re-confirm the namespace is empty.
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The utility is designed to clean-up after the forced or unexpected
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termination of Neutron agents.
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The --force flag should only be used as part of the cleanup of a devstack
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installation as it will blindly purge namespaces and their devices. This
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option also kills any lingering DHCP instances.
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"""
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eventlet.monkey_patch()
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conf = setup_conf()
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conf()
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config.setup_logging(conf)
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root_helper = agent_config.get_root_helper(conf)
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# Identify namespaces that are candidates for deletion.
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candidates = [ns for ns in
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ip_lib.IPWrapper.get_namespaces(root_helper)
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if eligible_for_deletion(conf, ns, conf.force)]
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if candidates:
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eventlet.sleep(2)
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for namespace in candidates:
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destroy_namespace(conf, namespace, conf.force)
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