138 lines
5.0 KiB
Python
138 lines
5.0 KiB
Python
# Copyright 2018 Maysa de Macedo Souza.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from http import client as httplib
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import os
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from flask import Flask
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from oslo_config import cfg
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from oslo_log import log as logging
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from kuryr.lib._i18n import _
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from kuryr.lib import config as kuryr_config
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from kuryr.lib import utils
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from kuryr_kubernetes import clients
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from kuryr_kubernetes import config
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from kuryr_kubernetes import exceptions as exc
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from kuryr_kubernetes.handlers import health as h_health
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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health_server_opts = [
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cfg.IntOpt('port',
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help=_('port for Health HTTP Server.'),
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default=8082),
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]
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CONF.register_opts(health_server_opts, "health_server")
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class HealthServer(object):
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"""Proxy server used by readiness and liveness probes to manage health checks.
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Allows to verify connectivity with Kubernetes API, Keystone and Neutron.
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If pool ports functionality is enabled it is verified whether
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the precreated ports are loaded into the pools. Also, checks handlers
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states.
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"""
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def __init__(self):
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self.ctx = None
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self._registry = h_health.HealthRegister.get_instance().registry
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self.application = Flask('health-daemon')
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self.application.add_url_rule(
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'/ready', methods=['GET'], view_func=self.readiness_status)
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self.application.add_url_rule(
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'/alive', methods=['GET'], view_func=self.liveness_status)
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self.headers = {'Connection': 'close'}
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def _components_ready(self):
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os_net = clients.get_network_client()
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project_id = config.CONF.neutron_defaults.project
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quota = os_net.get_quota(quota=project_id, details=True)
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for component in self._registry:
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if not component.is_ready(quota):
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LOG.debug('Controller component not ready: %s.' % component)
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return False
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return True
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def readiness_status(self):
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data = 'ok'
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if CONF.kubernetes.vif_pool_driver != 'noop':
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if not os.path.exists('/tmp/pools_loaded'):
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error_message = 'Ports not loaded into the pools.'
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LOG.error(error_message)
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return error_message, httplib.NOT_FOUND, self.headers
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k8s_conn = self.verify_k8s_connection()
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if not k8s_conn:
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error_message = 'Error when processing k8s healthz request.'
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LOG.error(error_message)
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return error_message, httplib.INTERNAL_SERVER_ERROR, self.headers
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try:
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self.verify_keystone_connection()
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except Exception as ex:
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error_message = ('Error when creating a Keystone session and '
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'getting a token: %s.' % ex)
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LOG.exception(error_message)
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return error_message, httplib.INTERNAL_SERVER_ERROR, self.headers
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try:
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if not self._components_ready():
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return '', httplib.INTERNAL_SERVER_ERROR, self.headers
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except Exception as ex:
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error_message = ('Error when processing neutron request %s' % ex)
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LOG.exception(error_message)
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return error_message, httplib.INTERNAL_SERVER_ERROR, self.headers
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LOG.info('Kuryr Controller readiness verified.')
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return data, httplib.OK, self.headers
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def liveness_status(self):
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data = 'ok'
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for component in self._registry:
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if not component.is_alive():
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LOG.debug('Kuryr Controller not healthy.')
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return '', httplib.INTERNAL_SERVER_ERROR, self.headers
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LOG.debug('Kuryr Controller Liveness verified.')
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return data, httplib.OK, self.headers
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def run(self):
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address = '0.0.0.0'
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try:
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LOG.info('Starting health check server.')
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self.application.run(address, CONF.health_server.port)
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except Exception:
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LOG.exception('Failed to start health check server.')
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raise
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def verify_k8s_connection(self):
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k8s = clients.get_kubernetes_client()
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try:
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k8s.get('/healthz', json=False, headers={'Connection': 'close'})
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except exc.K8sClientException:
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LOG.exception('Exception when trying to reach Kubernetes API.')
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return False
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return True
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def verify_keystone_connection(self):
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# Obtain a new token to ensure connectivity with keystone
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conf_group = kuryr_config.neutron_group.name
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auth_plugin = utils.get_auth_plugin(conf_group)
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sess = utils.get_keystone_session(conf_group, auth_plugin)
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sess.get_token()
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