d8892d2e72
Our logs are awful and this commit attempts to fix some issues with them: * Make sure we always indicate why some readiness or liveness probe fail. * Suppress INFO logs from werkzeug (so that we don't see every probe call on INFO level). * Remove logging of successful probe checks. * Make watcher restart logs less scary and include more cases. * Add backoff to watcher restarts so that we don't spam logs when K8s API is briefly unavailable. * Add warnings for low quotas. * Suppress some long logs on K8s healthz failures - we don't need full message from K8s printed twice. I also refactored CNI and controller health probes servers to make sure they're not duplicating code. Change-Id: Ia3db4863af8f28cfbaf2317042c8631cc63d9745
77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
# 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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import abc
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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_kubernetes import clients
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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class BaseHealthServer(abc.ABC):
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"""Base class of server used to provide readiness and liveness probes."""
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def __init__(self, app_name, port):
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self.app_name = app_name
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self.port = port
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self.ctx = None
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self.application = Flask(app_name)
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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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def apply_conn_close(response):
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response.headers['Connection'] = 'close'
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return response
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self.application.after_request(apply_conn_close)
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@abc.abstractmethod
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def readiness_status(self):
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raise NotImplementedError()
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@abc.abstractmethod
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def liveness_status(self):
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raise NotImplementedError()
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def run(self):
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# Disable obtrusive werkzeug logs.
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logging.getLogger('werkzeug').setLevel(logging.WARNING)
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address = '::'
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LOG.info('Starting %s health check server on %s:%d.', self.app_name,
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address, self.port)
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try:
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self.application.run(address, self.port)
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except Exception:
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LOG.exception('Failed to start %s health check server.',
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self.app_name)
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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 Exception as e:
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# Not LOG.exception to make sure long message from K8s API is not
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# repeated.
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LOG.error('Exception when trying to reach Kubernetes API: %s.', e)
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return False
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return True
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