202 lines
7.9 KiB
Python
202 lines
7.9 KiB
Python
# Copyright 2018 Red Hat, Inc.
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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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import datetime
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import json
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import threading
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import time
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import uuid
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import kubernetes
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from oslo_log import log as logging
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from tempest import config
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from tempest.lib.common.utils import test_utils
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from tempest.lib import decorators
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from kuryr_tempest_plugin.tests.scenario import base
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from kuryr_tempest_plugin.tests.scenario import consts
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LOG = logging.getLogger(__name__)
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CONF = config.CONF
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TIMEOUT = 120
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class TestHighAvailabilityScenario(base.BaseKuryrScenarioTest):
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@classmethod
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def skip_checks(cls):
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super(TestHighAvailabilityScenario, cls).skip_checks()
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if not (CONF.kuryr_kubernetes.ap_ha and
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CONF.kuryr_kubernetes.containerized):
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raise cls.skipException("kuryr-controller A/P HA must be enabled "
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"and kuryr-kubernetes must run in "
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"containerized mode.")
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def get_kuryr_leader_annotation(self):
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try:
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endpoint = self.k8s_client.CoreV1Api().read_namespaced_endpoints(
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consts.HA_ENDPOINT_NAME,
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CONF.kuryr_kubernetes.kube_system_namespace)
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annotation = endpoint.metadata.annotations[
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'control-plane.alpha.kubernetes.io/leader']
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return json.loads(annotation)
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except kubernetes.client.rest.ApiException:
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return None
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def wait_for_deployment_scale(self, desired_replicas,
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desired_state='Running'):
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def has_scaled():
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pods = self.k8s_client.CoreV1Api().list_namespaced_pod(
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CONF.kuryr_kubernetes.kube_system_namespace,
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label_selector='name=kuryr-controller')
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return (len(pods.items) == desired_replicas and
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all([pod.status.phase == desired_state
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for pod in pods.items]))
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self.assertTrue(test_utils.call_until_true(has_scaled, TIMEOUT, 5),
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'Timed out waiting for deployment to scale')
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def scale_controller_deployment(self, replicas):
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self.k8s_client.AppsV1Api().patch_namespaced_deployment(
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'kuryr-controller', CONF.kuryr_kubernetes.kube_system_namespace,
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{'spec': {'replicas': replicas}})
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self.wait_for_deployment_scale(replicas)
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@decorators.idempotent_id('3f09e7d1-0897-46b1-ba9d-ea4116523025')
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def test_scale_up_controller(self):
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controller_deployment = (
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self.k8s_client.AppsV1Api().read_namespaced_deployment(
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CONF.kuryr_kubernetes.controller_deployment_name,
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CONF.kuryr_kubernetes.kube_system_namespace))
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# On cleanup scale to original number of replicas
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self.addCleanup(self.scale_controller_deployment,
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controller_deployment.spec.replicas)
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# Scale to just a single replica
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self.scale_controller_deployment(1)
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# Create a pod and check connectivity
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self.create_and_ping_pod()
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# Get current leader annotation
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annotation = self.get_kuryr_leader_annotation()
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self.assertIsNotNone(annotation)
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transitions = annotation['leaderTransitions']
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# Scale the controller up and wait until it starts
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self.scale_controller_deployment(2)
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# Check if leader haven't switched
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annotation = self.get_kuryr_leader_annotation()
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self.assertEqual(transitions, annotation['leaderTransitions'])
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# Create another pod and check connectivity
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self.create_and_ping_pod()
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@decorators.idempotent_id('afe75fa5-e9ca-4f7d-bc16-8f1dd7884eea')
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def test_scale_down_controller(self):
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controller_deployment = (
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self.k8s_client.AppsV1Api().read_namespaced_deployment(
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CONF.kuryr_kubernetes.controller_deployment_name,
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CONF.kuryr_kubernetes.kube_system_namespace))
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# On cleanup scale to original number of replicas
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self.addCleanup(self.scale_controller_deployment,
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controller_deployment.spec.replicas)
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# Scale to 2 replicas
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self.scale_controller_deployment(2)
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# Create a pod and check connectivity
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self.create_and_ping_pod()
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# Scale the controller down and wait until it stops
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self.scale_controller_deployment(1)
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# Create another pod and check connectivity
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self.create_and_ping_pod()
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@decorators.idempotent_id('3b218c11-c77b-40a8-ba09-5dd5ae0f8ae3')
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def test_auto_fencing(self):
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controller_deployment = (
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self.k8s_client.AppsV1Api().read_namespaced_deployment(
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CONF.kuryr_kubernetes.controller_deployment_name,
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CONF.kuryr_kubernetes.kube_system_namespace))
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# On cleanup scale to original number of replicas
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self.addCleanup(self.scale_controller_deployment,
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controller_deployment.spec.replicas)
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# Scale to 2 replicas
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self.scale_controller_deployment(2)
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# Create a pod and check connectivity
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self.create_and_ping_pod()
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def hostile_takeover():
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"""Malform endpoint annotation to takeover the leadership
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This method runs for 3 minutes and for that time it malforms the
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endpoint annotation to simulate another kuryr-controller taking
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over the leadership. This should make other kuryr-controllers to
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step down and stop processing any events for those 3 minutes.
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"""
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timeout = datetime.datetime.utcnow() + datetime.timedelta(
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minutes=3)
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fake_name = str(uuid.uuid4())
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while datetime.datetime.utcnow() < timeout:
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current = datetime.datetime.utcnow()
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renew = current + datetime.timedelta(seconds=5)
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malformed = {
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"holderIdentity": fake_name,
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"leaseDurationSeconds": 5,
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"acquireTime": current.strftime("%Y-%m-%dT%H:%M:%SZ"),
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"renewTime": renew.strftime("%Y-%m-%dT%H:%M:%SZ"),
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"leaderTransitions": 0,
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}
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self.k8s_client.CoreV1Api().patch_namespaced_endpoints(
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consts.HA_ENDPOINT_NAME,
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CONF.kuryr_kubernetes.kube_system_namespace,
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{'metadata': {'annotations': {
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'control-plane.alpha.kubernetes.io/leader':
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json.dumps(malformed)}}})
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time.sleep(2)
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t = threading.Thread(target=hostile_takeover)
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t.start()
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# Create another pod and check that it's not getting wired.
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time.sleep(15) # We need to wait a bit for controller to autofence.
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name, pod = self.create_pod(wait_for_status=False)
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def is_pod_running():
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pod_obj = self.k8s_client.CoreV1Api().read_namespaced_pod(
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name, 'default')
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return pod_obj.status.phase == 'Running'
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self.addCleanup(self.delete_pod, name)
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self.assertFalse(test_utils.call_until_true(is_pod_running, TIMEOUT,
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5))
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# Wait 120 seconds more, malformed annotation should get cleared
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time.sleep(TIMEOUT)
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# Now pod should have the IP and be pingable
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ip = self.get_pod_ip(name)
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self.assertIsNotNone(ip)
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self.assertTrue(self.ping_ip_address(ip, ping_timeout=TIMEOUT))
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