180 lines
5.7 KiB
Python
180 lines
5.7 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 quantum.agent.common import config as agent_config
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from quantum.agent import dhcp_agent
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from quantum.agent import l3_agent
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from quantum.agent.linux import dhcp
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from quantum.agent.linux import ip_lib
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from quantum.agent.linux import ovs_lib
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from quantum.api.v2 import attributes
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from quantum.common import config
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from quantum.openstack.common import importutils
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from quantum.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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NS_MANGLING_PATTERN = ('(%s|%s)' % (dhcp_agent.NS_PREFIX, l3_agent.NS_PREFIX) +
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attributes.UUID_PATTERN)
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class NullDelegate(object):
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def __getattribute__(self, name):
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def noop(*args, **kwargs):
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pass
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return noop
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class FakeNetwork(object):
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def __init__(self, id):
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self.id = id
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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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opts = [
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cfg.StrOpt('dhcp_driver',
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default='quantum.agent.linux.dhcp.Dnsmasq',
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help=_("The driver used to manage the DHCP server.")),
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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_opts(opts)
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agent_config.register_root_helper(conf)
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conf.register_opts(dhcp.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_agent.NS_PREFIX, '')
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null_delegate = NullDelegate()
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dhcp_driver = importutils.import_object(
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conf.dhcp_driver,
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conf,
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FakeNetwork(network_id),
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root_helper,
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null_delegate)
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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, e:
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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 Quantum 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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