252 lines
10 KiB
Python
252 lines
10 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 Citrix Systems, Inc.
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# Copyright 2010 OpenStack LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Management class for host-related functions (start, reboot, etc).
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"""
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import logging
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from nova.compute import task_states
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from nova.compute import vm_states
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from nova import context
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from nova import exception
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from nova import notifications
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from nova.openstack.common import jsonutils
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from nova.virt.xenapi import pool_states
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from nova.virt.xenapi import vm_utils
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LOG = logging.getLogger(__name__)
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class Host(object):
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"""
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Implements host related operations.
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"""
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def __init__(self, session, virtapi):
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self._session = session
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self._virtapi = virtapi
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def host_power_action(self, _host, action):
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"""Reboots or shuts down the host."""
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args = {"action": jsonutils.dumps(action)}
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methods = {"reboot": "host_reboot", "shutdown": "host_shutdown"}
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response = call_xenhost(self._session, methods[action], args)
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return response.get("power_action", response)
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def host_maintenance_mode(self, host, mode):
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"""Start/Stop host maintenance window. On start, it triggers
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guest VMs evacuation."""
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if not mode:
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return 'off_maintenance'
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host_list = [host_ref for host_ref in
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self._session.call_xenapi('host.get_all')
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if host_ref != self._session.get_xenapi_host()]
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migrations_counter = vm_counter = 0
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ctxt = context.get_admin_context()
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for vm_ref, vm_rec in vm_utils.list_vms(self._session):
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for host_ref in host_list:
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try:
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# Ensure only guest instances are migrated
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uuid = vm_rec['other_config'].get('nova_uuid')
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if not uuid:
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name = vm_rec['name_label']
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uuid = _uuid_find(self._virtapi, ctxt, host, name)
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if not uuid:
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msg = _('Instance %(name)s running on %(host)s'
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' could not be found in the database:'
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' assuming it is a worker VM and skip'
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' ping migration to a new host')
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LOG.info(msg % locals())
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continue
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instance = self._virtapi.instance_get_by_uuid(ctxt, uuid)
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vm_counter = vm_counter + 1
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aggregate = self._virtapi.aggregate_get_by_host(
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ctxt, host, key=pool_states.POOL_FLAG)
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if not aggregate:
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msg = _('Aggregate for host %(host)s count not be'
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' found.') % dict(host=host)
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raise exception.NotFound(msg)
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dest = _host_find(ctxt, self._session, aggregate[0],
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host_ref)
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(old_ref, new_ref) = self._virtapi.instance_update(
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ctxt,
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instance['uuid'],
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{'host': dest,
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'task_state': task_states.MIGRATING})
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notifications.send_update(ctxt, old_ref, new_ref)
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self._session.call_xenapi('VM.pool_migrate',
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vm_ref, host_ref, {})
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migrations_counter = migrations_counter + 1
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(old_ref, new_ref) = self._virtapi.instance_update(
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ctxt,
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instance['uuid'],
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{'vm_state': vm_states.ACTIVE})
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notifications.send_update(ctxt, old_ref, new_ref)
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break
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except self._session.XenAPI.Failure:
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LOG.exception('Unable to migrate VM %(vm_ref)s'
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'from %(host)s' % locals())
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(old_ref, new_ref) = self._virtapi.instance_update(
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ctxt,
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instance['uuid'],
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{'host': host,
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'vm_state': vm_states.ACTIVE})
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notifications.send_update(ctxt, old_ref, new_ref)
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if vm_counter == migrations_counter:
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return 'on_maintenance'
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else:
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raise exception.NoValidHost(reason='Unable to find suitable '
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'host for VMs evacuation')
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def set_host_enabled(self, _host, enabled):
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"""Sets the specified host's ability to accept new instances."""
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args = {"enabled": jsonutils.dumps(enabled)}
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response = call_xenhost(self._session, "set_host_enabled", args)
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return response.get("status", response)
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def get_host_uptime(self, _host):
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"""Returns the result of calling "uptime" on the target host."""
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response = call_xenhost(self._session, "host_uptime", {})
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return response.get("uptime", response)
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class HostState(object):
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"""Manages information about the XenServer host this compute
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node is running on.
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"""
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def __init__(self, session):
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super(HostState, self).__init__()
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self._session = session
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self._stats = {}
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self.update_status()
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def get_host_stats(self, refresh=False):
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"""Return the current state of the host. If 'refresh' is
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True, run the update first.
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"""
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if refresh:
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self.update_status()
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return self._stats
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def update_status(self):
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"""Since under Xenserver, a compute node runs on a given host,
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we can get host status information using xenapi.
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"""
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LOG.debug(_("Updating host stats"))
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data = call_xenhost(self._session, "host_data", {})
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if data:
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try:
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# Get the SR usage
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sr_ref = vm_utils.safe_find_sr(self._session)
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except exception.NotFound as e:
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# No SR configured
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LOG.error(_("Unable to get SR for this host: %s") % e)
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return
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self._session.call_xenapi("SR.scan", sr_ref)
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sr_rec = self._session.call_xenapi("SR.get_record", sr_ref)
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total = int(sr_rec["physical_size"])
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used = int(sr_rec["physical_utilisation"])
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data["disk_total"] = total
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data["disk_used"] = used
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data["disk_available"] = total - used
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data["supported_instances"] = to_supported_instances(
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data.get("host_capabilities")
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)
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host_memory = data.get('host_memory', None)
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if host_memory:
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data["host_memory_total"] = host_memory.get('total', 0)
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data["host_memory_overhead"] = host_memory.get('overhead', 0)
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data["host_memory_free"] = host_memory.get('free', 0)
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data["host_memory_free_computed"] = host_memory.get(
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'free-computed', 0)
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del data['host_memory']
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data['hypervisor_hostname'] = data['host_hostname']
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self._stats = data
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def to_supported_instances(host_capabilities):
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if not host_capabilities:
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return []
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result = []
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for capability in host_capabilities:
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try:
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ostype, _version, arch = capability.split("-")
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result.append((arch, 'xapi', ostype))
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except ValueError:
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LOG.warning(
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_("Failed to extract instance support from %s"), capability)
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return result
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def call_xenhost(session, method, arg_dict):
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"""There will be several methods that will need this general
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handling for interacting with the xenhost plugin, so this abstracts
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out that behavior.
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"""
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# Create a task ID as something that won't match any instance ID
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try:
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result = session.call_plugin('xenhost', method, args=arg_dict)
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if not result:
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return ''
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return jsonutils.loads(result)
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except ValueError:
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LOG.exception(_("Unable to get updated status"))
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return None
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except session.XenAPI.Failure as e:
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LOG.error(_("The call to %(method)s returned "
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"an error: %(e)s.") % locals())
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return e.details[1]
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def _uuid_find(virtapi, context, host, name_label):
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"""Return instance uuid by name_label."""
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for i in virtapi.instance_get_all_by_host(context, host):
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if i.name == name_label:
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return i['uuid']
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return None
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def _host_find(context, session, src_aggregate, dst):
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"""Return the host from the xenapi host reference.
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:param src_aggregate: the aggregate that the compute host being put in
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maintenance (source of VMs) belongs to
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:param dst: the hypervisor host reference (destination of VMs)
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:return: the compute host that manages dst
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"""
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# NOTE: this would be a lot simpler if nova-compute stored
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# CONF.host in the XenServer host's other-config map.
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# TODO(armando-migliaccio): improve according the note above
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uuid = session.call_xenapi('host.get_record', dst)['uuid']
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for compute_host, host_uuid in src_aggregate.metadetails.iteritems():
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if host_uuid == uuid:
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return compute_host
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raise exception.NoValidHost(reason='Host %(host_uuid)s could not be found '
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'from aggregate metadata: %(metadata)s.' %
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{'host_uuid': uuid,
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'metadata': src_aggregate.metadetails})
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