9a6811ae6b
The OpenStackClients class provides a convenient way to create and cache client instances. The idea behind this code comes from Magnum [0]. The OpenStackClients class will act as the manager of other project's clients, providing an easy way to fetch instances of said clients. This will allow the clients to be cached. An instance of OpenStackClients is created for every call that comes into the decision engine and the applier, using the request context to pass needed (domain id) parameters to get a Keystone session. This instance should be shared as much as possible to avoid additional unneccessary connections to the other services. This class will also allow for the version of each client to be configurable via the watcher.conf file. The method by which a Keystone session is also changed to use the keystoneauth1.loading library. In order to avoid DuplicateOptErrors with the keystone_authtoken group used for the keystonemiddleware in the API code, a new conf group named "watcher_clients_auth" is created. A typical configuration using a password authentication scheme will look like: [watcher_clients_auth] auth_type = password auth_url = http://<server-ip>:<port> username = <username> password = <password> project_domain_id = default user_domain_id = default [0]: https://github.com/openstack/magnum/blob/master/magnum/common/clients.py DocImpact Change-Id: Iab9d0b304099686da2e9e2b19e8b1de4332ff378 Implements: blueprint external-api-versioning Closes-Bug: #1530790 Closes-Bug: #1539670 Closes-Bug: #1522774
695 lines
26 KiB
Python
695 lines
26 KiB
Python
# -*- encoding: utf-8 -*-
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# Copyright (c) 2015 b<>com
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#
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# Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
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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
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# 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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#
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import random
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import time
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from oslo_log import log
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import cinderclient.exceptions as ciexceptions
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import novaclient.exceptions as nvexceptions
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from watcher.common import clients
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LOG = log.getLogger(__name__)
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class NovaHelper(object):
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def __init__(self, osc=None):
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""":param osc: an OpenStackClients instance"""
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self.osc = osc if osc else clients.OpenStackClients()
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self.neutron = self.osc.neutron()
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self.cinder = self.osc.cinder()
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self.nova = self.osc.nova()
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self.glance = self.osc.glance()
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def get_hypervisors_list(self):
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return self.nova.hypervisors.list()
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def find_instance(self, instance_id):
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search_opts = {'all_tenants': True}
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instances = self.nova.servers.list(detailed=True,
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search_opts=search_opts)
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instance = None
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for _instance in instances:
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if _instance.id == instance_id:
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instance = _instance
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break
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return instance
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def watcher_non_live_migrate_instance(self, instance_id, hypervisor_id,
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keep_original_image_name=True):
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"""This method migrates a given instance
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using an image of this instance and creating a new instance
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from this image. It saves some configuration information
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about the original instance : security group, list of networks,
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list of attached volumes, floating IP, ...
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in order to apply the same settings to the new instance.
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At the end of the process the original instance is deleted.
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It returns True if the migration was successful,
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False otherwise.
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:param instance_id: the unique id of the instance to migrate.
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:param keep_original_image_name: flag indicating whether the
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image name from which the original instance was built must be
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used as the name of the intermediate image used for migration.
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If this flag is False, a temporary image name is built
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"""
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new_image_name = ""
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LOG.debug(
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"Trying a non-live migrate of instance '%s' "
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"using a temporary image ..." % instance_id)
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# Looking for the instance to migrate
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instance = self.find_instance(instance_id)
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if not instance:
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LOG.debug("Instance %s not found !" % instance_id)
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return False
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else:
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host_name = getattr(instance, "OS-EXT-SRV-ATTR:host")
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# https://bugs.launchpad.net/nova/+bug/1182965
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LOG.debug(
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"Instance %s found on host '%s'." % (instance_id, host_name))
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if not keep_original_image_name:
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# randrange gives you an integral value
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irand = random.randint(0, 1000)
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# Building the temporary image name
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# which will be used for the migration
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new_image_name = "tmp-migrate-%s-%s" % (instance_id, irand)
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else:
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# Get the image name of the current instance.
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# We'll use the same name for the new instance.
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imagedict = getattr(instance, "image")
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image_id = imagedict["id"]
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image = self.nova.images.get(image_id)
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new_image_name = getattr(image, "name")
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instance_name = getattr(instance, "name")
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flavordict = getattr(instance, "flavor")
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# a_dict = dict([flavorstr.strip('{}').split(":"),])
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flavor_id = flavordict["id"]
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flavor = self.nova.flavors.get(flavor_id)
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flavor_name = getattr(flavor, "name")
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keypair_name = getattr(instance, "key_name")
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addresses = getattr(instance, "addresses")
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floating_ip = ""
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network_names_list = []
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for network_name, network_conf_obj in addresses.items():
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LOG.debug(
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"Extracting network configuration for network '%s'" %
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network_name)
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network_names_list.append(network_name)
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for net_conf_item in network_conf_obj:
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if net_conf_item['OS-EXT-IPS:type'] == "floating":
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floating_ip = net_conf_item['addr']
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break
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sec_groups_list = getattr(instance, "security_groups")
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sec_groups = []
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for sec_group_dict in sec_groups_list:
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sec_groups.append(sec_group_dict['name'])
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# Stopping the old instance properly so
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# that no new data is sent to it and to its attached volumes
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stopped_ok = self.stop_instance(instance_id)
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if not stopped_ok:
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LOG.debug("Could not stop instance: %s" % instance_id)
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return False
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# Building the temporary image which will be used
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# to re-build the same instance on another target host
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image_uuid = self.create_image_from_instance(instance_id,
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new_image_name)
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if not image_uuid:
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LOG.debug(
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"Could not build temporary image of instance: %s" %
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instance_id)
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return False
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#
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# We need to get the list of attached volumes and detach
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# them from the instance in order to attache them later
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# to the new instance
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#
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blocks = []
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# Looks like this :
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# os-extended-volumes:volumes_attached |
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# [{u'id': u'c5c3245f-dd59-4d4f-8d3a-89d80135859a'}]
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attached_volumes = getattr(instance,
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"os-extended-volumes:volumes_attached")
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for attached_volume in attached_volumes:
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volume_id = attached_volume['id']
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try:
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volume = self.cinder.volumes.get(volume_id)
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attachments_list = getattr(volume, "attachments")
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device_name = attachments_list[0]['device']
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# When a volume is attached to an instance
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# it contains the following property :
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# attachments = [{u'device': u'/dev/vdb',
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# u'server_id': u'742cc508-a2f2-4769-a794-bcdad777e814',
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# u'id': u'f6d62785-04b8-400d-9626-88640610f65e',
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# u'host_name': None, u'volume_id':
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# u'f6d62785-04b8-400d-9626-88640610f65e'}]
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# boot_index indicates a number
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# designating the boot order of the device.
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# Use -1 for the boot volume,
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# choose 0 for an attached volume.
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block_device_mapping_v2_item = {"device_name": device_name,
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"source_type": "volume",
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"destination_type":
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"volume",
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"uuid": volume_id,
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"boot_index": "0"}
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blocks.append(
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block_device_mapping_v2_item)
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LOG.debug("Detaching volume %s from instance: %s" % (
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volume_id, instance_id))
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# volume.detach()
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self.nova.volumes.delete_server_volume(instance_id,
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volume_id)
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if not self.wait_for_volume_status(volume, "available", 5,
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10):
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LOG.debug(
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"Could not detach volume %s from instance: %s" % (
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volume_id, instance_id))
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return False
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except ciexceptions.NotFound:
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LOG.debug("Volume '%s' not found " % image_id)
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return False
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# We create the new instance from
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# the intermediate image of the original instance
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new_instance = self. \
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create_instance(hypervisor_id,
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instance_name,
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image_uuid,
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flavor_name,
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sec_groups,
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network_names_list=network_names_list,
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keypair_name=keypair_name,
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create_new_floating_ip=False,
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block_device_mapping_v2=blocks)
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if not new_instance:
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LOG.debug(
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"Could not create new instance "
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"for non-live migration of instance %s" % instance_id)
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return False
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try:
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LOG.debug("Detaching floating ip '%s' from instance %s" % (
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floating_ip, instance_id))
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# We detach the floating ip from the current instance
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instance.remove_floating_ip(floating_ip)
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LOG.debug(
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"Attaching floating ip '%s' to the new instance %s" % (
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floating_ip, new_instance.id))
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# We attach the same floating ip to the new instance
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new_instance.add_floating_ip(floating_ip)
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except Exception as e:
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LOG.debug(e)
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new_host_name = getattr(new_instance, "OS-EXT-SRV-ATTR:host")
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# Deleting the old instance (because no more useful)
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delete_ok = self.delete_instance(instance_id)
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if not delete_ok:
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LOG.debug("Could not delete instance: %s" % instance_id)
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return False
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LOG.debug(
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"Instance %s has been successfully migrated "
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"to new host '%s' and its new id is %s." % (
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instance_id, new_host_name, new_instance.id))
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return True
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def built_in_non_live_migrate_instance(self, instance_id, hypervisor_id):
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"""This method does a live migration of a given instance
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This method uses the Nova built-in non-live migrate()
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action to migrate a given instance.
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It returns True if the migration was successful, False otherwise.
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:param instance_id: the unique id of the instance to migrate.
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"""
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LOG.debug(
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"Trying a Nova built-in non-live "
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"migrate of instance %s ..." % instance_id)
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# Looking for the instance to migrate
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instance = self.find_instance(instance_id)
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if not instance:
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LOG.debug("Instance not found: %s" % instance_id)
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return False
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else:
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host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
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LOG.debug(
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"Instance %s found on host '%s'." % (instance_id, host_name))
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instance.migrate()
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# Poll at 5 second intervals, until the status is as expected
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if self.wait_for_instance_status(instance,
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('VERIFY_RESIZE', 'ERROR'),
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5, 10):
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instance = self.nova.servers.get(instance.id)
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if instance.status == 'VERIFY_RESIZE':
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host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
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LOG.debug(
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"Instance %s has been successfully "
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"migrated to host '%s'." % (
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instance_id, host_name))
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# We need to confirm that the resize() operation
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# has succeeded in order to
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# get back instance state to 'ACTIVE'
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instance.confirm_resize()
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return True
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elif instance.status == 'ERROR':
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LOG.debug("Instance %s migration failed" % instance_id)
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return False
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def live_migrate_instance(self, instance_id, dest_hostname,
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block_migration=False, retry=120):
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"""This method does a live migration of a given instance
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This method uses the Nova built-in live_migrate()
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action to do a live migration of a given instance.
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It returns True if the migration was successful,
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False otherwise.
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:param instance_id: the unique id of the instance to migrate.
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:param dest_hostname: the name of the destination compute node.
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:param block_migration: No shared storage is required.
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"""
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LOG.debug("Trying a live migrate of instance %s to host '%s'" % (
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instance_id, dest_hostname))
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# Looking for the instance to migrate
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instance = self.find_instance(instance_id)
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if not instance:
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LOG.debug("Instance not found: %s" % instance_id)
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return False
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else:
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host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
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LOG.debug(
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"Instance %s found on host '%s'." % (instance_id, host_name))
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instance.live_migrate(host=dest_hostname,
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block_migration=block_migration,
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disk_over_commit=True)
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while getattr(instance,
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'OS-EXT-SRV-ATTR:host') != dest_hostname \
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and retry:
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instance = self.nova.servers.get(instance.id)
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LOG.debug(
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'Waiting the migration of {0} to {1}'.format(
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instance,
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getattr(instance,
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'OS-EXT-SRV-ATTR:host')))
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time.sleep(1)
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retry -= 1
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host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
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if host_name != dest_hostname:
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return False
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LOG.debug(
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"Live migration succeeded : "
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"instance %s is now on host '%s'." % (
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instance_id, host_name))
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return True
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return False
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def enable_service_nova_compute(self, hostname):
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if self.nova.services.enable(host=hostname,
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binary='nova-compute'). \
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status == 'enabled':
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return True
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else:
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return False
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def disable_service_nova_compute(self, hostname):
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if self.nova.services.disable(host=hostname,
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binary='nova-compute'). \
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status == 'disabled':
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return True
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else:
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return False
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def set_host_offline(self, hostname):
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# See API on http://developer.openstack.org/api-ref-compute-v2.1.html
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# especially the PUT request
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# regarding this resource : /v2.1/os-hosts/{host_name}
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#
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# The following body should be sent :
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# {
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# "host": {
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# "host": "65c5d5b7e3bd44308e67fc50f362aee6",
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# "maintenance_mode": "off_maintenance",
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# "status": "enabled"
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# }
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# }
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# Voir ici
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# https://github.com/openstack/nova/
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# blob/master/nova/virt/xenapi/host.py
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# set_host_enabled(self, enabled):
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# Sets the compute host's ability to accept new instances.
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# host_maintenance_mode(self, host, mode):
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# Start/Stop host maintenance window.
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# On start, it triggers guest VMs evacuation.
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host = self.nova.hosts.get(hostname)
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if not host:
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LOG.debug("host not found: %s" % hostname)
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return False
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else:
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host[0].update(
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{"maintenance_mode": "disable", "status": "disable"})
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return True
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def create_image_from_instance(self, instance_id, image_name,
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metadata={"reason": "instance_migrate"}):
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"""This method creates a new image from a given instance.
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It waits for this image to be in 'active' state before returning.
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It returns the unique UUID of the created image if successful,
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None otherwise.
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:param instance_id: the uniqueid of
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the instance to backup as an image.
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:param image_name: the name of the image to create.
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:param metadata: a dictionary containing the list of
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key-value pairs to associate to the image as metadata.
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"""
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LOG.debug(
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"Trying to create an image from instance %s ..." % instance_id)
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# Looking for the instance
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instance = self.find_instance(instance_id)
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if not instance:
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LOG.debug("Instance not found: %s" % instance_id)
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return None
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else:
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host_name = getattr(instance, 'OS-EXT-SRV-ATTR:host')
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LOG.debug(
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"Instance %s found on host '%s'." % (instance_id, host_name))
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# We need to wait for an appropriate status
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# of the instance before we can build an image from it
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if self.wait_for_instance_status(instance, ('ACTIVE', 'SHUTOFF'),
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5,
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10):
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image_uuid = self.nova.servers.create_image(instance_id,
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image_name,
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metadata)
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image = self.glance.images.get(image_uuid)
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# Waiting for the new image to be officially in ACTIVE state
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# in order to make sure it can be used
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status = image.status
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retry = 10
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while status != 'active' and status != 'error' and retry:
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time.sleep(5)
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retry -= 1
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# Retrieve the instance again so the status field updates
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image = self.glance.images.get(image_uuid)
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status = image.status
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LOG.debug("Current image status: %s" % status)
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if not image:
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LOG.debug("Image not found: %s" % image_uuid)
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else:
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LOG.debug(
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"Image %s successfully created for instance %s" % (
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image_uuid, instance_id))
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return image_uuid
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return None
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def delete_instance(self, instance_id):
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"""This method deletes a given instance.
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:param instance_id: the unique id of the instance to delete.
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"""
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LOG.debug("Trying to remove instance %s ..." % instance_id)
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instance = self.find_instance(instance_id)
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if not instance:
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LOG.debug("Instance not found: %s" % instance_id)
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return False
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else:
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self.nova.servers.delete(instance_id)
|
||
LOG.debug("Instance %s removed." % instance_id)
|
||
return True
|
||
|
||
def stop_instance(self, instance_id):
|
||
"""This method stops a given instance.
|
||
|
||
:param instance_id: the unique id of the instance to stop.
|
||
"""
|
||
|
||
LOG.debug("Trying to stop instance %s ..." % instance_id)
|
||
|
||
instance = self.find_instance(instance_id)
|
||
|
||
if not instance:
|
||
LOG.debug("Instance not found: %s" % instance_id)
|
||
return False
|
||
else:
|
||
self.nova.servers.stop(instance_id)
|
||
|
||
if self.wait_for_vm_state(instance, "stopped", 8, 10):
|
||
LOG.debug("Instance %s stopped." % instance_id)
|
||
return True
|
||
else:
|
||
return False
|
||
|
||
def wait_for_vm_state(self, server, vm_state, retry, sleep):
|
||
"""Waits for server to be in a specific vm_state
|
||
|
||
The vm_state can be one of the following :
|
||
active, stopped
|
||
|
||
:param server: server object.
|
||
:param vm_state: for which state we are waiting for
|
||
:param retry: how many times to retry
|
||
:param sleep: seconds to sleep between the retries
|
||
"""
|
||
|
||
if not server:
|
||
return False
|
||
|
||
while getattr(server, 'OS-EXT-STS:vm_state') != vm_state and retry:
|
||
time.sleep(sleep)
|
||
server = self.nova.servers.get(server)
|
||
retry -= 1
|
||
return getattr(server, 'OS-EXT-STS:vm_state') == vm_state
|
||
|
||
def wait_for_instance_status(self, instance, status_list, retry, sleep):
|
||
"""Waits for instance to be in a specific status
|
||
|
||
The status can be one of the following
|
||
: BUILD, ACTIVE, ERROR, VERIFY_RESIZE, SHUTOFF
|
||
|
||
:param instance: instance object.
|
||
:param status_list: tuple containing the list of
|
||
status we are waiting for
|
||
:param retry: how many times to retry
|
||
:param sleep: seconds to sleep between the retries
|
||
"""
|
||
|
||
if not instance:
|
||
return False
|
||
|
||
while instance.status not in status_list and retry:
|
||
LOG.debug("Current instance status: %s" % instance.status)
|
||
time.sleep(sleep)
|
||
instance = self.nova.servers.get(instance.id)
|
||
retry -= 1
|
||
LOG.debug("Current instance status: %s" % instance.status)
|
||
return instance.status in status_list
|
||
|
||
def create_instance(self, hypervisor_id, inst_name="test", image_id=None,
|
||
flavor_name="m1.tiny",
|
||
sec_group_list=["default"],
|
||
network_names_list=["demo-net"], keypair_name="mykeys",
|
||
create_new_floating_ip=True,
|
||
block_device_mapping_v2=None):
|
||
"""This method creates a new instance
|
||
|
||
It also creates, if requested, a new floating IP and associates
|
||
it with the new instance
|
||
It returns the unique id of the created instance.
|
||
"""
|
||
|
||
LOG.debug(
|
||
"Trying to create new instance '%s' "
|
||
"from image '%s' with flavor '%s' ..." % (
|
||
inst_name, image_id, flavor_name))
|
||
# TODO(jed) wait feature
|
||
# Allow admin users to view any keypair
|
||
# https://bugs.launchpad.net/nova/+bug/1182965
|
||
if not self.nova.keypairs.findall(name=keypair_name):
|
||
LOG.debug("Key pair '%s' not found with user '%s'" % (
|
||
keypair_name, self.user))
|
||
return
|
||
else:
|
||
LOG.debug("Key pair '%s' found with user '%s'" % (
|
||
keypair_name, self.user))
|
||
|
||
try:
|
||
image = self.nova.images.get(image_id)
|
||
except nvexceptions.NotFound:
|
||
LOG.debug("Image '%s' not found " % image_id)
|
||
return
|
||
|
||
try:
|
||
flavor = self.nova.flavors.find(name=flavor_name)
|
||
except nvexceptions.NotFound:
|
||
LOG.debug("Flavor '%s' not found " % flavor_name)
|
||
return
|
||
|
||
# Make sure all security groups exist
|
||
for sec_group_name in sec_group_list:
|
||
try:
|
||
self.nova.security_groups.find(name=sec_group_name)
|
||
|
||
except nvexceptions.NotFound:
|
||
LOG.debug("Security group '%s' not found " % sec_group_name)
|
||
return
|
||
|
||
net_list = list()
|
||
|
||
for network_name in network_names_list:
|
||
nic_id = self.get_network_id_from_name(network_name)
|
||
|
||
if not nic_id:
|
||
LOG.debug("Network '%s' not found " % network_name)
|
||
return
|
||
net_obj = {"net-id": nic_id}
|
||
net_list.append(net_obj)
|
||
|
||
instance = self.nova.servers. \
|
||
create(inst_name,
|
||
image, flavor=flavor,
|
||
key_name=keypair_name,
|
||
security_groups=sec_group_list,
|
||
nics=net_list,
|
||
block_device_mapping_v2=block_device_mapping_v2,
|
||
availability_zone="nova:" +
|
||
hypervisor_id)
|
||
|
||
# Poll at 5 second intervals, until the status is no longer 'BUILD'
|
||
if instance:
|
||
if self.wait_for_instance_status(instance,
|
||
('ACTIVE', 'ERROR'), 5, 10):
|
||
instance = self.nova.servers.get(instance.id)
|
||
|
||
if create_new_floating_ip and instance.status == 'ACTIVE':
|
||
LOG.debug(
|
||
"Creating a new floating IP"
|
||
" for instance '%s'" % instance.id)
|
||
# Creating floating IP for the new instance
|
||
floating_ip = self.nova.floating_ips.create()
|
||
|
||
instance.add_floating_ip(floating_ip)
|
||
|
||
LOG.debug("Instance %s associated to Floating IP '%s'" % (
|
||
instance.id, floating_ip.ip))
|
||
|
||
return instance
|
||
|
||
def get_network_id_from_name(self, net_name="private"):
|
||
"""This method returns the unique id of the provided network name"""
|
||
networks = self.neutron.list_networks(name=net_name)
|
||
|
||
# LOG.debug(networks)
|
||
network_id = networks['networks'][0]['id']
|
||
|
||
return network_id
|
||
|
||
def get_vms_by_hypervisor(self, host):
|
||
return [vm for vm in
|
||
self.nova.servers.list(search_opts={"all_tenants": True})
|
||
if self.get_hostname(vm) == host]
|
||
|
||
def get_hostname(self, vm):
|
||
return str(getattr(vm, 'OS-EXT-SRV-ATTR:host'))
|
||
|
||
def get_flavor_instance(self, instance, cache):
|
||
fid = instance.flavor['id']
|
||
if fid in cache:
|
||
flavor = cache.get(fid)
|
||
else:
|
||
try:
|
||
flavor = self.nova.flavors.get(fid)
|
||
except ciexceptions.NotFound:
|
||
flavor = None
|
||
cache[fid] = flavor
|
||
attr_defaults = [('name', 'unknown-id-%s' % fid),
|
||
('vcpus', 0), ('ram', 0), ('disk', 0),
|
||
('ephemeral', 0)]
|
||
for attr, default in attr_defaults:
|
||
if not flavor:
|
||
instance.flavor[attr] = default
|
||
continue
|
||
instance.flavor[attr] = getattr(flavor, attr, default)
|