OpenStack Networking (Neutron)
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# Copyright (c) 2015 Red Hat Inc.
#
# 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 os
import sys
import threading
import time
import httplib2
import netaddr
from oslo_config import cfg
from oslo_log import log as logging
from six.moves import queue
from neutron._i18n import _
from neutron.agent.l3 import ha
from neutron.agent.linux import daemon
from neutron.agent.linux import ip_lib
from neutron.agent.linux import utils as agent_utils
from neutron.common import config
from neutron.conf.agent.l3 import keepalived
from neutron import privileged
LOG = logging.getLogger(__name__)
class KeepalivedUnixDomainConnection(agent_utils.UnixDomainHTTPConnection):
def __init__(self, *args, **kwargs):
# Old style super initialization is required!
agent_utils.UnixDomainHTTPConnection.__init__(
self, *args, **kwargs)
self.socket_path = (
ha.L3AgentKeepalivedStateChangeServer.
get_keepalived_state_change_socket_path(cfg.CONF))
class MonitorDaemon(daemon.Daemon):
def __init__(self, pidfile, router_id, user, group, namespace, conf_dir,
interface, cidr):
self.router_id = router_id
self.namespace = namespace
self.conf_dir = conf_dir
self.interface = interface
self.cidr = cidr
self.monitor = None
self.event_stop = threading.Event()
self.event_started = threading.Event()
self.queue = queue.Queue()
super(MonitorDaemon, self).__init__(pidfile, uuid=router_id,
user=user, group=group)
def run(self):
self._thread_ip_monitor = threading.Thread(
target=ip_lib.ip_monitor,
args=(self.namespace, self.queue, self.event_stop,
self.event_started))
self._thread_read_queue = threading.Thread(
target=self.read_queue,
args=(self.queue, self.event_stop, self.event_started))
self._thread_ip_monitor.start()
self._thread_read_queue.start()
self.handle_initial_state()
while True:
time.sleep(1)
def read_queue(self, _queue, event_stop, event_started):
event_started.wait()
while not event_stop.is_set():
try:
event = _queue.get(timeout=2)
except queue.Empty:
event = None
if not event:
continue
if event['name'] == self.interface and event['cidr'] == self.cidr:
new_state = 'master' if event['event'] == 'added' else 'backup'
self.write_state_change(new_state)
self.notify_agent(new_state)
elif event['name'] != self.interface and event['event'] == 'added':
# Send GARPs for all new router interfaces.
# REVISIT(jlibosva): keepalived versions 1.2.19 and below
# contain bug where gratuitous ARPs are not sent on receiving
# SIGHUP signal. This is a workaround to this bug. keepalived
# has this issue fixed since 1.2.20 but the version is not
# packaged in some distributions (RHEL/CentOS/Ubuntu Xenial).
# Remove this code once new keepalived versions are available.
self.send_garp(event)
def handle_initial_state(self):
try:
state = 'backup'
ip = ip_lib.IPDevice(self.interface, self.namespace)
for address in ip.addr.list():
if address.get('cidr') == self.cidr:
state = 'master'
break
LOG.debug('Initial status of router %s is %s',
self.router_id, state)
self.write_state_change(state)
self.notify_agent(state)
except Exception:
LOG.exception('Failed to get initial status of router %s',
self.router_id)
def write_state_change(self, state):
with open(os.path.join(
self.conf_dir, 'state'), 'w') as state_file:
state_file.write(state)
LOG.debug('Wrote router %s state %s', self.router_id, state)
def notify_agent(self, state):
resp, content = httplib2.Http().request(
# Note that the message is sent via a Unix domain socket so that
# the URL doesn't matter.
'http://127.0.0.1/',
headers={'X-Neutron-Router-Id': self.router_id,
'X-Neutron-State': state},
connection_type=KeepalivedUnixDomainConnection)
if resp.status != 200:
raise Exception(_('Unexpected response: %s') % resp)
LOG.debug('Notified agent router %s, state %s', self.router_id, state)
def send_garp(self, event):
"""Send gratuitous ARP for given event."""
ip_address = str(netaddr.IPNetwork(event['cidr']).ip)
ip_lib.send_ip_addr_adv_notif(
self.namespace,
event['name'],
ip_address,
log_exception=False,
use_eventlet=False
)
LOG.debug('Sent GARP to %(ip_address)s from %(device_name)s',
{'ip_address': ip_address, 'device_name': event['name']})
def handle_sigterm(self, signum, frame):
self.event_stop.set()
self._thread_read_queue.join(timeout=5)
super(MonitorDaemon, self).handle_sigterm(signum, frame)
def configure(conf):
config.init(sys.argv[1:])
conf.set_override('log_dir', cfg.CONF.conf_dir)
conf.set_override('debug', True)
conf.set_override('use_syslog', True)
config.setup_logging()
privileged.default.set_client_mode(False)
def main():
keepalived.register_cli_l3_agent_keepalived_opts()
keepalived.register_l3_agent_keepalived_opts()
configure(cfg.CONF)
MonitorDaemon(cfg.CONF.pid_file,
cfg.CONF.router_id,
cfg.CONF.user,
cfg.CONF.group,
cfg.CONF.namespace,
cfg.CONF.conf_dir,
cfg.CONF.monitor_interface,
cfg.CONF.monitor_cidr).start()