Ed Leafe
1572 lines
58 KiB
Python
1572 lines
58 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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# Copyright (c) 2010 Citrix Systems, Inc.
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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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A connection to a hypervisor through libvirt.
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Supports KVM, LXC, QEMU, UML, and XEN.
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**Related Flags**
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:libvirt_type: Libvirt domain type. Can be kvm, qemu, uml, xen
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(default: kvm).
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:libvirt_uri: Override for the default libvirt URI (depends on libvirt_type).
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:libvirt_xml_template: Libvirt XML Template.
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:rescue_image_id: Rescue ami image (default: ami-rescue).
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:rescue_kernel_id: Rescue aki image (default: aki-rescue).
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:rescue_ramdisk_id: Rescue ari image (default: ari-rescue).
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:injected_network_template: Template file for injected network
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:allow_project_net_traffic: Whether to allow in project network traffic
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"""
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import hashlib
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import multiprocessing
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import netaddr
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import os
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import random
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import re
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import shutil
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import subprocess
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import sys
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import tempfile
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import time
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import uuid
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from xml.dom import minidom
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from xml.etree import ElementTree
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from eventlet import greenthread
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from eventlet import tpool
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from nova import context as nova_context
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from nova import db
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from nova import exception
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from nova import flags
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import nova.image
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from nova import log as logging
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from nova import utils
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from nova import vnc
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from nova.auth import manager
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from nova.compute import instance_types
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from nova.compute import power_state
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from nova.virt import disk
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from nova.virt import driver
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from nova.virt import images
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from nova.virt.libvirt import netutils
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libvirt = None
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libxml2 = None
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Template = None
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LOG = logging.getLogger('nova.virt.libvirt_conn')
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FLAGS = flags.FLAGS
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flags.DECLARE('live_migration_retry_count', 'nova.compute.manager')
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# TODO(vish): These flags should probably go into a shared location
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flags.DEFINE_string('rescue_image_id', 'ami-rescue', 'Rescue ami image')
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flags.DEFINE_string('rescue_kernel_id', 'aki-rescue', 'Rescue aki image')
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flags.DEFINE_string('rescue_ramdisk_id', 'ari-rescue', 'Rescue ari image')
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flags.DEFINE_string('libvirt_xml_template',
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utils.abspath('virt/libvirt.xml.template'),
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'Libvirt XML Template')
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flags.DEFINE_string('libvirt_type',
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'kvm',
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'Libvirt domain type (valid options are: '
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'kvm, lxc, qemu, uml, xen)')
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flags.DEFINE_string('libvirt_uri',
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'',
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'Override the default libvirt URI (which is dependent'
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' on libvirt_type)')
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flags.DEFINE_bool('allow_project_net_traffic',
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True,
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'Whether to allow in project network traffic')
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flags.DEFINE_bool('use_cow_images',
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True,
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'Whether to use cow images')
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flags.DEFINE_string('ajaxterm_portrange',
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'10000-12000',
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'Range of ports that ajaxterm should randomly try to bind')
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flags.DEFINE_string('firewall_driver',
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'nova.virt.libvirt.firewall.IptablesFirewallDriver',
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'Firewall driver (defaults to iptables)')
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flags.DEFINE_string('cpuinfo_xml_template',
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utils.abspath('virt/cpuinfo.xml.template'),
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'CpuInfo XML Template (Used only live migration now)')
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flags.DEFINE_string('live_migration_uri',
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"qemu+tcp://%s/system",
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'Define protocol used by live_migration feature')
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flags.DEFINE_string('live_migration_flag',
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"VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER",
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'Define live migration behavior.')
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flags.DEFINE_integer('live_migration_bandwidth', 0,
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'Define live migration behavior')
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flags.DEFINE_string('qemu_img', 'qemu-img',
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'binary to use for qemu-img commands')
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flags.DEFINE_string('libvirt_vif_type', 'bridge',
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'Type of VIF to create.')
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flags.DEFINE_string('libvirt_vif_driver',
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'nova.virt.libvirt.vif.LibvirtBridgeDriver',
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'The libvirt VIF driver to configure the VIFs.')
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def get_connection(read_only):
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# These are loaded late so that there's no need to install these
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# libraries when not using libvirt.
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# Cheetah is separate because the unit tests want to load Cheetah,
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# but not libvirt.
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global libvirt
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global libxml2
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if libvirt is None:
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libvirt = __import__('libvirt')
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if libxml2 is None:
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libxml2 = __import__('libxml2')
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_late_load_cheetah()
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return LibvirtConnection(read_only)
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def _late_load_cheetah():
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global Template
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if Template is None:
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t = __import__('Cheetah.Template', globals(), locals(),
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['Template'], -1)
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Template = t.Template
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def _strip_dev(mount_path):
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return re.sub(r'^/dev/', '', mount_path)
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class LibvirtConnection(driver.ComputeDriver):
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def __init__(self, read_only):
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super(LibvirtConnection, self).__init__()
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self.libvirt_uri = self.get_uri()
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self.libvirt_xml = open(FLAGS.libvirt_xml_template).read()
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self.cpuinfo_xml = open(FLAGS.cpuinfo_xml_template).read()
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self._wrapped_conn = None
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self.read_only = read_only
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fw_class = utils.import_class(FLAGS.firewall_driver)
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self.firewall_driver = fw_class(get_connection=self._get_connection)
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self.vif_driver = utils.import_object(FLAGS.libvirt_vif_driver)
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def init_host(self, host):
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# NOTE(nsokolov): moved instance restarting to ComputeManager
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pass
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def _get_connection(self):
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if not self._wrapped_conn or not self._test_connection():
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LOG.debug(_('Connecting to libvirt: %s'), self.libvirt_uri)
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self._wrapped_conn = self._connect(self.libvirt_uri,
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self.read_only)
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return self._wrapped_conn
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_conn = property(_get_connection)
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def _test_connection(self):
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try:
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self._wrapped_conn.getInfo()
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return True
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except libvirt.libvirtError as e:
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if e.get_error_code() == libvirt.VIR_ERR_SYSTEM_ERROR and \
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e.get_error_domain() == libvirt.VIR_FROM_REMOTE:
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LOG.debug(_('Connection to libvirt broke'))
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return False
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raise
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def get_uri(self):
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if FLAGS.libvirt_type == 'uml':
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uri = FLAGS.libvirt_uri or 'uml:///system'
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elif FLAGS.libvirt_type == 'xen':
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uri = FLAGS.libvirt_uri or 'xen:///'
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elif FLAGS.libvirt_type == 'lxc':
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uri = FLAGS.libvirt_uri or 'lxc:///'
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else:
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uri = FLAGS.libvirt_uri or 'qemu:///system'
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return uri
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def _connect(self, uri, read_only):
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auth = [[libvirt.VIR_CRED_AUTHNAME, libvirt.VIR_CRED_NOECHOPROMPT],
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'root',
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None]
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if read_only:
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return libvirt.openReadOnly(uri)
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else:
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return libvirt.openAuth(uri, auth, 0)
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def list_instances(self):
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return [self._conn.lookupByID(x).name()
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for x in self._conn.listDomainsID()]
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def _map_to_instance_info(self, domain):
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"""Gets info from a virsh domain object into an InstanceInfo"""
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# domain.info() returns a list of:
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# state: one of the state values (virDomainState)
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# maxMemory: the maximum memory used by the domain
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# memory: the current amount of memory used by the domain
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# nbVirtCPU: the number of virtual CPU
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# puTime: the time used by the domain in nanoseconds
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(state, _max_mem, _mem, _num_cpu, _cpu_time) = domain.info()
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name = domain.name()
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return driver.InstanceInfo(name, state)
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def list_instances_detail(self):
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infos = []
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for domain_id in self._conn.listDomainsID():
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domain = self._conn.lookupByID(domain_id)
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info = self._map_to_instance_info(domain)
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infos.append(info)
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return infos
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def plug_vifs(self, instance, network_info):
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"""Plugin VIFs into networks."""
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for (network, mapping) in network_info:
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self.vif_driver.plug(instance, network, mapping)
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def destroy(self, instance, network_info, cleanup=True):
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instance_name = instance['name']
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try:
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virt_dom = self._lookup_by_name(instance_name)
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except exception.NotFound:
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virt_dom = None
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# If the instance is already terminated, we're still happy
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# Otherwise, destroy it
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if virt_dom is not None:
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try:
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virt_dom.destroy()
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except libvirt.libvirtError as e:
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is_okay = False
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errcode = e.get_error_code()
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if errcode == libvirt.VIR_ERR_OPERATION_INVALID:
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# If the instance if already shut off, we get this:
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# Code=55 Error=Requested operation is not valid:
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# domain is not running
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(state, _max_mem, _mem, _cpus, _t) = virt_dom.info()
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if state == power_state.SHUTOFF:
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is_okay = True
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if not is_okay:
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LOG.warning(_("Error from libvirt during destroy of "
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"%(instance_name)s. Code=%(errcode)s "
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"Error=%(e)s") %
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locals())
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raise
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try:
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# NOTE(justinsb): We remove the domain definition. We probably
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# would do better to keep it if cleanup=False (e.g. volumes?)
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# (e.g. #2 - not losing machines on failure)
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virt_dom.undefine()
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except libvirt.libvirtError as e:
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errcode = e.get_error_code()
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LOG.warning(_("Error from libvirt during undefine of "
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"%(instance_name)s. Code=%(errcode)s "
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"Error=%(e)s") %
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locals())
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raise
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for (network, mapping) in network_info:
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self.vif_driver.unplug(instance, network, mapping)
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def _wait_for_destroy():
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"""Called at an interval until the VM is gone."""
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instance_name = instance['name']
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try:
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state = self.get_info(instance_name)['state']
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except exception.NotFound:
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msg = _("Instance %s destroyed successfully.") % instance_name
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LOG.info(msg)
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raise utils.LoopingCallDone
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timer = utils.LoopingCall(_wait_for_destroy)
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timer.start(interval=0.5, now=True)
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self.firewall_driver.unfilter_instance(instance,
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network_info=network_info)
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if cleanup:
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self._cleanup(instance)
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return True
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def _cleanup(self, instance):
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target = os.path.join(FLAGS.instances_path, instance['name'])
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instance_name = instance['name']
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LOG.info(_('instance %(instance_name)s: deleting instance files'
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' %(target)s') % locals())
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if FLAGS.libvirt_type == 'lxc':
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disk.destroy_container(target, instance, nbd=FLAGS.use_cow_images)
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if os.path.exists(target):
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shutil.rmtree(target)
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@exception.wrap_exception()
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def attach_volume(self, instance_name, device_path, mountpoint):
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virt_dom = self._lookup_by_name(instance_name)
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mount_device = mountpoint.rpartition("/")[2]
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(type, protocol, name) = \
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self._get_volume_device_info(device_path)
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if type == 'block':
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xml = """<disk type='block'>
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<driver name='qemu' type='raw'/>
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<source dev='%s'/>
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<target dev='%s' bus='virtio'/>
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</disk>""" % (device_path, mount_device)
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elif type == 'network':
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xml = """<disk type='network'>
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<driver name='qemu' type='raw'/>
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<source protocol='%s' name='%s'/>
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<target dev='%s' bus='virtio'/>
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</disk>""" % (protocol, name, mount_device)
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virt_dom.attachDevice(xml)
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def _get_disk_xml(self, xml, device):
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"""Returns the xml for the disk mounted at device"""
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try:
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doc = libxml2.parseDoc(xml)
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except Exception:
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return None
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ctx = doc.xpathNewContext()
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try:
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ret = ctx.xpathEval('/domain/devices/disk')
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for node in ret:
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for child in node.children:
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if child.name == 'target':
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if child.prop('dev') == device:
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return str(node)
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finally:
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if ctx is not None:
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ctx.xpathFreeContext()
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if doc is not None:
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doc.freeDoc()
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@exception.wrap_exception()
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def detach_volume(self, instance_name, mountpoint):
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virt_dom = self._lookup_by_name(instance_name)
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mount_device = mountpoint.rpartition("/")[2]
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xml = self._get_disk_xml(virt_dom.XMLDesc(0), mount_device)
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if not xml:
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raise exception.DiskNotFound(location=mount_device)
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virt_dom.detachDevice(xml)
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@exception.wrap_exception()
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def snapshot(self, context, instance, image_href):
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"""Create snapshot from a running VM instance.
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This command only works with qemu 0.14+, the qemu_img flag is
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provided so that a locally compiled binary of qemu-img can be used
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to support this command.
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"""
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virt_dom = self._lookup_by_name(instance['name'])
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(image_service, image_id) = nova.image.get_image_service(
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instance['image_ref'])
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base = image_service.show(context, image_id)
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(snapshot_image_service, snapshot_image_id) = \
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nova.image.get_image_service(image_href)
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snapshot = snapshot_image_service.show(context, snapshot_image_id)
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metadata = {'is_public': False,
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'status': 'active',
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'name': snapshot['name'],
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'properties': {
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'kernel_id': instance['kernel_id'],
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'image_location': 'snapshot',
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'image_state': 'available',
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'owner_id': instance['project_id'],
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'ramdisk_id': instance['ramdisk_id'],
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}
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}
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if 'architecture' in base['properties']:
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arch = base['properties']['architecture']
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metadata['properties']['architecture'] = arch
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if 'disk_format' in base:
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metadata['disk_format'] = base['disk_format']
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if 'container_format' in base:
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metadata['container_format'] = base['container_format']
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# Make the snapshot
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snapshot_name = uuid.uuid4().hex
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snapshot_xml = """
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<domainsnapshot>
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<name>%s</name>
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</domainsnapshot>
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""" % snapshot_name
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snapshot_ptr = virt_dom.snapshotCreateXML(snapshot_xml, 0)
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# Find the disk
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xml_desc = virt_dom.XMLDesc(0)
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domain = ElementTree.fromstring(xml_desc)
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source = domain.find('devices/disk/source')
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disk_path = source.get('file')
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# Export the snapshot to a raw image
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temp_dir = tempfile.mkdtemp()
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out_path = os.path.join(temp_dir, snapshot_name)
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qemu_img_cmd = (FLAGS.qemu_img,
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'convert',
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'-f',
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'qcow2',
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'-O',
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'raw',
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'-s',
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snapshot_name,
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disk_path,
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out_path)
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utils.execute(*qemu_img_cmd)
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# Upload that image to the image service
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with open(out_path) as image_file:
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image_service.update(context,
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image_href,
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metadata,
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image_file)
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# Clean up
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shutil.rmtree(temp_dir)
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@exception.wrap_exception()
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def reboot(self, instance, network_info):
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"""Reboot a virtual machine, given an instance reference.
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This method actually destroys and re-creates the domain to ensure the
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reboot happens, as the guest OS cannot ignore this action.
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"""
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virt_dom = self._conn.lookupByName(instance['name'])
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# NOTE(itoumsn): Use XML delived from the running instance
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# instead of using to_xml(instance). This is almost the ultimate
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# stupid workaround.
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xml = virt_dom.XMLDesc(0)
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# NOTE(itoumsn): self.shutdown() and wait instead of self.destroy() is
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# better because we cannot ensure flushing dirty buffers
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# in the guest OS. But, in case of KVM, shutdown() does not work...
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self.destroy(instance, network_info, cleanup=False)
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self.plug_vifs(instance, network_info)
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self.firewall_driver.setup_basic_filtering(instance)
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self.firewall_driver.prepare_instance_filter(instance)
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self._create_new_domain(xml)
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self.firewall_driver.apply_instance_filter(instance)
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def _wait_for_reboot():
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"""Called at an interval until the VM is running again."""
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instance_name = instance['name']
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try:
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state = self.get_info(instance_name)['state']
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except exception.NotFound:
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msg = _("During reboot, %s disappeared.") % instance_name
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LOG.error(msg)
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raise utils.LoopingCallDone
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if state == power_state.RUNNING:
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msg = _("Instance %s rebooted successfully.") % instance_name
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LOG.info(msg)
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raise utils.LoopingCallDone
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timer = utils.LoopingCall(_wait_for_reboot)
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return timer.start(interval=0.5, now=True)
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|
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@exception.wrap_exception()
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def pause(self, instance, callback):
|
|
"""Pause VM instance"""
|
|
dom = self._lookup_by_name(instance.name)
|
|
dom.suspend()
|
|
|
|
@exception.wrap_exception()
|
|
def unpause(self, instance, callback):
|
|
"""Unpause paused VM instance"""
|
|
dom = self._lookup_by_name(instance.name)
|
|
dom.resume()
|
|
|
|
@exception.wrap_exception()
|
|
def suspend(self, instance, callback):
|
|
"""Suspend the specified instance"""
|
|
dom = self._lookup_by_name(instance.name)
|
|
dom.managedSave(0)
|
|
|
|
@exception.wrap_exception()
|
|
def resume(self, instance, callback):
|
|
"""resume the specified instance"""
|
|
dom = self._lookup_by_name(instance.name)
|
|
dom.create()
|
|
|
|
@exception.wrap_exception()
|
|
def rescue(self, context, instance, callback, network_info):
|
|
"""Loads a VM using rescue images.
|
|
|
|
A rescue is normally performed when something goes wrong with the
|
|
primary images and data needs to be corrected/recovered. Rescuing
|
|
should not edit or over-ride the original image, only allow for
|
|
data recovery.
|
|
|
|
"""
|
|
self.destroy(instance, network_info, cleanup=False)
|
|
|
|
xml = self.to_xml(instance, rescue=True)
|
|
rescue_images = {'image_id': FLAGS.rescue_image_id,
|
|
'kernel_id': FLAGS.rescue_kernel_id,
|
|
'ramdisk_id': FLAGS.rescue_ramdisk_id}
|
|
self._create_image(context, instance, xml, '.rescue', rescue_images)
|
|
self._create_new_domain(xml)
|
|
|
|
def _wait_for_rescue():
|
|
"""Called at an interval until the VM is running again."""
|
|
instance_name = instance['name']
|
|
|
|
try:
|
|
state = self.get_info(instance_name)['state']
|
|
except exception.NotFound:
|
|
msg = _("During reboot, %s disappeared.") % instance_name
|
|
LOG.error(msg)
|
|
raise utils.LoopingCallDone
|
|
|
|
if state == power_state.RUNNING:
|
|
msg = _("Instance %s rescued successfully.") % instance_name
|
|
LOG.info(msg)
|
|
raise utils.LoopingCallDone
|
|
|
|
timer = utils.LoopingCall(_wait_for_rescue)
|
|
return timer.start(interval=0.5, now=True)
|
|
|
|
@exception.wrap_exception()
|
|
def unrescue(self, instance, network_info):
|
|
"""Reboot the VM which is being rescued back into primary images.
|
|
|
|
Because reboot destroys and re-creates instances, unresue should
|
|
simply call reboot.
|
|
|
|
"""
|
|
self.reboot(instance, network_info)
|
|
|
|
@exception.wrap_exception()
|
|
def poll_rescued_instances(self, timeout):
|
|
pass
|
|
|
|
# NOTE(ilyaalekseyev): Implementation like in multinics
|
|
# for xenapi(tr3buchet)
|
|
@exception.wrap_exception()
|
|
def spawn(self, context, instance, network_info,
|
|
block_device_mapping=None):
|
|
xml = self.to_xml(instance, False, network_info=network_info,
|
|
block_device_mapping=block_device_mapping)
|
|
block_device_mapping = block_device_mapping or []
|
|
self.firewall_driver.setup_basic_filtering(instance, network_info)
|
|
self.firewall_driver.prepare_instance_filter(instance, network_info)
|
|
self._create_image(context, instance, xml, network_info=network_info,
|
|
block_device_mapping=block_device_mapping)
|
|
domain = self._create_new_domain(xml)
|
|
LOG.debug(_("instance %s: is running"), instance['name'])
|
|
self.firewall_driver.apply_instance_filter(instance)
|
|
|
|
def _wait_for_boot():
|
|
"""Called at an interval until the VM is running."""
|
|
instance_name = instance['name']
|
|
|
|
try:
|
|
state = self.get_info(instance_name)['state']
|
|
except exception.NotFound:
|
|
msg = _("During reboot, %s disappeared.") % instance_name
|
|
LOG.error(msg)
|
|
raise utils.LoopingCallDone
|
|
|
|
if state == power_state.RUNNING:
|
|
msg = _("Instance %s spawned successfully.") % instance_name
|
|
LOG.info(msg)
|
|
raise utils.LoopingCallDone
|
|
|
|
timer = utils.LoopingCall(_wait_for_boot)
|
|
return timer.start(interval=0.5, now=True)
|
|
|
|
def _flush_xen_console(self, virsh_output):
|
|
LOG.info(_('virsh said: %r'), virsh_output)
|
|
virsh_output = virsh_output[0].strip()
|
|
|
|
if virsh_output.startswith('/dev/'):
|
|
LOG.info(_("cool, it's a device"))
|
|
out, err = utils.execute('sudo', 'dd',
|
|
"if=%s" % virsh_output,
|
|
'iflag=nonblock',
|
|
check_exit_code=False)
|
|
return out
|
|
else:
|
|
return ''
|
|
|
|
def _append_to_file(self, data, fpath):
|
|
LOG.info(_('data: %(data)r, fpath: %(fpath)r') % locals())
|
|
fp = open(fpath, 'a+')
|
|
fp.write(data)
|
|
return fpath
|
|
|
|
def _dump_file(self, fpath):
|
|
fp = open(fpath, 'r+')
|
|
contents = fp.read()
|
|
LOG.info(_('Contents of file %(fpath)s: %(contents)r') % locals())
|
|
return contents
|
|
|
|
@exception.wrap_exception()
|
|
def get_console_output(self, instance):
|
|
console_log = os.path.join(FLAGS.instances_path, instance['name'],
|
|
'console.log')
|
|
|
|
utils.execute('sudo', 'chown', os.getuid(), console_log)
|
|
|
|
if FLAGS.libvirt_type == 'xen':
|
|
# Xen is special
|
|
virsh_output = utils.execute('virsh', 'ttyconsole',
|
|
instance['name'])
|
|
data = self._flush_xen_console(virsh_output)
|
|
fpath = self._append_to_file(data, console_log)
|
|
elif FLAGS.libvirt_type == 'lxc':
|
|
# LXC is also special
|
|
LOG.info(_("Unable to read LXC console"))
|
|
else:
|
|
fpath = console_log
|
|
|
|
return self._dump_file(fpath)
|
|
|
|
@exception.wrap_exception()
|
|
def get_ajax_console(self, instance):
|
|
def get_open_port():
|
|
start_port, end_port = FLAGS.ajaxterm_portrange.split("-")
|
|
for i in xrange(0, 100): # don't loop forever
|
|
port = random.randint(int(start_port), int(end_port))
|
|
# netcat will exit with 0 only if the port is in use,
|
|
# so a nonzero return value implies it is unused
|
|
cmd = 'netcat', '0.0.0.0', port, '-w', '1'
|
|
try:
|
|
stdout, stderr = utils.execute(*cmd, process_input='')
|
|
except exception.ProcessExecutionError:
|
|
return port
|
|
raise Exception(_('Unable to find an open port'))
|
|
|
|
def get_pty_for_instance(instance_name):
|
|
virt_dom = self._lookup_by_name(instance_name)
|
|
xml = virt_dom.XMLDesc(0)
|
|
dom = minidom.parseString(xml)
|
|
|
|
for serial in dom.getElementsByTagName('serial'):
|
|
if serial.getAttribute('type') == 'pty':
|
|
source = serial.getElementsByTagName('source')[0]
|
|
return source.getAttribute('path')
|
|
|
|
port = get_open_port()
|
|
token = str(uuid.uuid4())
|
|
host = instance['host']
|
|
|
|
ajaxterm_cmd = 'sudo socat - %s' \
|
|
% get_pty_for_instance(instance['name'])
|
|
|
|
cmd = '%s/tools/ajaxterm/ajaxterm.py --command "%s" -t %s -p %s' \
|
|
% (utils.novadir(), ajaxterm_cmd, token, port)
|
|
|
|
subprocess.Popen(cmd, shell=True)
|
|
return {'token': token, 'host': host, 'port': port}
|
|
|
|
def get_host_ip_addr(self):
|
|
return FLAGS.my_ip
|
|
|
|
@exception.wrap_exception()
|
|
def get_vnc_console(self, instance):
|
|
def get_vnc_port_for_instance(instance_name):
|
|
virt_dom = self._lookup_by_name(instance_name)
|
|
xml = virt_dom.XMLDesc(0)
|
|
# TODO: use etree instead of minidom
|
|
dom = minidom.parseString(xml)
|
|
|
|
for graphic in dom.getElementsByTagName('graphics'):
|
|
if graphic.getAttribute('type') == 'vnc':
|
|
return graphic.getAttribute('port')
|
|
|
|
port = get_vnc_port_for_instance(instance['name'])
|
|
token = str(uuid.uuid4())
|
|
host = instance['host']
|
|
|
|
return {'token': token, 'host': host, 'port': port}
|
|
|
|
@staticmethod
|
|
def _cache_image(fn, target, fname, cow=False, *args, **kwargs):
|
|
"""Wrapper for a method that creates an image that caches the image.
|
|
|
|
This wrapper will save the image into a common store and create a
|
|
copy for use by the hypervisor.
|
|
|
|
The underlying method should specify a kwarg of target representing
|
|
where the image will be saved.
|
|
|
|
fname is used as the filename of the base image. The filename needs
|
|
to be unique to a given image.
|
|
|
|
If cow is True, it will make a CoW image instead of a copy.
|
|
"""
|
|
if not os.path.exists(target):
|
|
base_dir = os.path.join(FLAGS.instances_path, '_base')
|
|
if not os.path.exists(base_dir):
|
|
os.mkdir(base_dir)
|
|
base = os.path.join(base_dir, fname)
|
|
|
|
@utils.synchronized(fname)
|
|
def call_if_not_exists(base, fn, *args, **kwargs):
|
|
if not os.path.exists(base):
|
|
fn(target=base, *args, **kwargs)
|
|
|
|
call_if_not_exists(base, fn, *args, **kwargs)
|
|
|
|
if cow:
|
|
utils.execute('qemu-img', 'create', '-f', 'qcow2', '-o',
|
|
'cluster_size=2M,backing_file=%s' % base,
|
|
target)
|
|
else:
|
|
utils.execute('cp', base, target)
|
|
|
|
def _fetch_image(self, context, target, image_id, user_id, project_id,
|
|
size=None):
|
|
"""Grab image and optionally attempt to resize it"""
|
|
images.fetch(context, image_id, target, user_id, project_id)
|
|
if size:
|
|
disk.extend(target, size)
|
|
|
|
def _create_local(self, target, local_gb):
|
|
"""Create a blank image of specified size"""
|
|
utils.execute('truncate', target, '-s', "%dG" % local_gb)
|
|
# TODO(vish): should we format disk by default?
|
|
|
|
def _create_image(self, context, inst, libvirt_xml, suffix='',
|
|
disk_images=None, network_info=None,
|
|
block_device_mapping=None):
|
|
block_device_mapping = block_device_mapping or []
|
|
|
|
if not suffix:
|
|
suffix = ''
|
|
|
|
# syntactic nicety
|
|
def basepath(fname='', suffix=suffix):
|
|
return os.path.join(FLAGS.instances_path,
|
|
inst['name'],
|
|
fname + suffix)
|
|
|
|
# ensure directories exist and are writable
|
|
utils.execute('mkdir', '-p', basepath(suffix=''))
|
|
|
|
LOG.info(_('instance %s: Creating image'), inst['name'])
|
|
f = open(basepath('libvirt.xml'), 'w')
|
|
f.write(libvirt_xml)
|
|
f.close()
|
|
|
|
if FLAGS.libvirt_type == 'lxc':
|
|
container_dir = '%s/rootfs' % basepath(suffix='')
|
|
utils.execute('mkdir', '-p', container_dir)
|
|
|
|
# NOTE(vish): No need add the suffix to console.log
|
|
os.close(os.open(basepath('console.log', ''),
|
|
os.O_CREAT | os.O_WRONLY, 0660))
|
|
|
|
if not disk_images:
|
|
disk_images = {'image_id': inst['image_ref'],
|
|
'kernel_id': inst['kernel_id'],
|
|
'ramdisk_id': inst['ramdisk_id']}
|
|
|
|
if disk_images['kernel_id']:
|
|
fname = '%08x' % int(disk_images['kernel_id'])
|
|
self._cache_image(fn=self._fetch_image,
|
|
context=context,
|
|
target=basepath('kernel'),
|
|
fname=fname,
|
|
image_id=disk_images['kernel_id'],
|
|
user_id=inst['user_id'],
|
|
project_id=inst['project_id'])
|
|
if disk_images['ramdisk_id']:
|
|
fname = '%08x' % int(disk_images['ramdisk_id'])
|
|
self._cache_image(fn=self._fetch_image,
|
|
context=context,
|
|
target=basepath('ramdisk'),
|
|
fname=fname,
|
|
image_id=disk_images['ramdisk_id'],
|
|
user_id=inst['user_id'],
|
|
project_id=inst['project_id'])
|
|
|
|
root_fname = hashlib.sha1(disk_images['image_id']).hexdigest()
|
|
size = FLAGS.minimum_root_size
|
|
|
|
inst_type_id = inst['instance_type_id']
|
|
inst_type = instance_types.get_instance_type(inst_type_id)
|
|
if inst_type['name'] == 'm1.tiny' or suffix == '.rescue':
|
|
size = None
|
|
root_fname += "_sm"
|
|
|
|
if not self._volume_in_mapping(self.root_mount_device,
|
|
block_device_mapping):
|
|
self._cache_image(fn=self._fetch_image,
|
|
context=context,
|
|
target=basepath('disk'),
|
|
fname=root_fname,
|
|
cow=FLAGS.use_cow_images,
|
|
image_id=disk_images['image_id'],
|
|
user_id=inst['user_id'],
|
|
project_id=inst['project_id'],
|
|
size=size)
|
|
|
|
if inst_type['local_gb'] and not self._volume_in_mapping(
|
|
self.local_mount_device, block_device_mapping):
|
|
self._cache_image(fn=self._create_local,
|
|
target=basepath('disk.local'),
|
|
fname="local_%s" % inst_type['local_gb'],
|
|
cow=FLAGS.use_cow_images,
|
|
local_gb=inst_type['local_gb'])
|
|
|
|
# For now, we assume that if we're not using a kernel, we're using a
|
|
# partitioned disk image where the target partition is the first
|
|
# partition
|
|
target_partition = None
|
|
if not inst['kernel_id']:
|
|
target_partition = "1"
|
|
|
|
if FLAGS.libvirt_type == 'lxc':
|
|
target_partition = None
|
|
|
|
if inst['key_data']:
|
|
key = str(inst['key_data'])
|
|
else:
|
|
key = None
|
|
net = None
|
|
|
|
nets = []
|
|
ifc_template = open(FLAGS.injected_network_template).read()
|
|
ifc_num = -1
|
|
have_injected_networks = False
|
|
admin_context = nova_context.get_admin_context()
|
|
for (network_ref, mapping) in network_info:
|
|
ifc_num += 1
|
|
|
|
if not network_ref['injected']:
|
|
continue
|
|
|
|
have_injected_networks = True
|
|
address = mapping['ips'][0]['ip']
|
|
netmask = mapping['ips'][0]['netmask']
|
|
address_v6 = None
|
|
gateway_v6 = None
|
|
netmask_v6 = None
|
|
if FLAGS.use_ipv6:
|
|
address_v6 = mapping['ip6s'][0]['ip']
|
|
netmask_v6 = mapping['ip6s'][0]['netmask']
|
|
gateway_v6 = mapping['gateway6']
|
|
net_info = {'name': 'eth%d' % ifc_num,
|
|
'address': address,
|
|
'netmask': netmask,
|
|
'gateway': mapping['gateway'],
|
|
'broadcast': mapping['broadcast'],
|
|
'dns': ' '.join(mapping['dns']),
|
|
'address_v6': address_v6,
|
|
'gateway6': gateway_v6,
|
|
'netmask_v6': netmask_v6}
|
|
nets.append(net_info)
|
|
|
|
if have_injected_networks:
|
|
net = str(Template(ifc_template,
|
|
searchList=[{'interfaces': nets,
|
|
'use_ipv6': FLAGS.use_ipv6}]))
|
|
|
|
if key or net:
|
|
inst_name = inst['name']
|
|
img_id = inst.image_ref
|
|
if key:
|
|
LOG.info(_('instance %(inst_name)s: injecting key into'
|
|
' image %(img_id)s') % locals())
|
|
if net:
|
|
LOG.info(_('instance %(inst_name)s: injecting net into'
|
|
' image %(img_id)s') % locals())
|
|
try:
|
|
disk.inject_data(basepath('disk'), key, net,
|
|
partition=target_partition,
|
|
nbd=FLAGS.use_cow_images)
|
|
|
|
if FLAGS.libvirt_type == 'lxc':
|
|
disk.setup_container(basepath('disk'),
|
|
container_dir=container_dir,
|
|
nbd=FLAGS.use_cow_images)
|
|
except Exception as e:
|
|
# This could be a windows image, or a vmdk format disk
|
|
LOG.warn(_('instance %(inst_name)s: ignoring error injecting'
|
|
' data into image %(img_id)s (%(e)s)') % locals())
|
|
|
|
if FLAGS.libvirt_type == 'uml':
|
|
utils.execute('sudo', 'chown', 'root', basepath('disk'))
|
|
|
|
root_mount_device = 'vda' # FIXME for now. it's hard coded.
|
|
local_mount_device = 'vdb' # FIXME for now. it's hard coded.
|
|
|
|
def _volume_in_mapping(self, mount_device, block_device_mapping):
|
|
mount_device_ = _strip_dev(mount_device)
|
|
for vol in block_device_mapping:
|
|
vol_mount_device = _strip_dev(vol['mount_device'])
|
|
if vol_mount_device == mount_device_:
|
|
return True
|
|
return False
|
|
|
|
def _get_volume_device_info(self, device_path):
|
|
if device_path.startswith('/dev/'):
|
|
return ('block', None, None)
|
|
elif ':' in device_path:
|
|
(protocol, name) = device_path.split(':')
|
|
return ('network', protocol, name)
|
|
else:
|
|
raise exception.InvalidDevicePath(path=device_path)
|
|
|
|
def _prepare_xml_info(self, instance, rescue=False, network_info=None,
|
|
block_device_mapping=None):
|
|
block_device_mapping = block_device_mapping or []
|
|
# TODO(adiantum) remove network_info creation code
|
|
# when multinics will be completed
|
|
if not network_info:
|
|
network_info = netutils.get_network_info(instance)
|
|
|
|
nics = []
|
|
for (network, mapping) in network_info:
|
|
nics.append(self.vif_driver.plug(instance, network, mapping))
|
|
# FIXME(vish): stick this in db
|
|
inst_type_id = instance['instance_type_id']
|
|
inst_type = instance_types.get_instance_type(inst_type_id)
|
|
|
|
if FLAGS.use_cow_images:
|
|
driver_type = 'qcow2'
|
|
else:
|
|
driver_type = 'raw'
|
|
|
|
for vol in block_device_mapping:
|
|
vol['mount_device'] = _strip_dev(vol['mount_device'])
|
|
(vol['type'], vol['protocol'], vol['name']) = \
|
|
self._get_volume_device_info(vol['device_path'])
|
|
|
|
ebs_root = self._volume_in_mapping(self.root_mount_device,
|
|
block_device_mapping)
|
|
if self._volume_in_mapping(self.local_mount_device,
|
|
block_device_mapping):
|
|
local_gb = False
|
|
else:
|
|
local_gb = inst_type['local_gb']
|
|
|
|
xml_info = {'type': FLAGS.libvirt_type,
|
|
'name': instance['name'],
|
|
'basepath': os.path.join(FLAGS.instances_path,
|
|
instance['name']),
|
|
'memory_kb': inst_type['memory_mb'] * 1024,
|
|
'vcpus': inst_type['vcpus'],
|
|
'rescue': rescue,
|
|
'local': local_gb,
|
|
'driver_type': driver_type,
|
|
'vif_type': FLAGS.libvirt_vif_type,
|
|
'nics': nics,
|
|
'ebs_root': ebs_root,
|
|
'volumes': block_device_mapping}
|
|
|
|
if FLAGS.vnc_enabled and FLAGS.libvirt_type not in ('lxc', 'uml'):
|
|
xml_info['vncserver_host'] = FLAGS.vncserver_host
|
|
xml_info['vnc_keymap'] = FLAGS.vnc_keymap
|
|
if not rescue:
|
|
if instance['kernel_id']:
|
|
xml_info['kernel'] = xml_info['basepath'] + "/kernel"
|
|
|
|
if instance['ramdisk_id']:
|
|
xml_info['ramdisk'] = xml_info['basepath'] + "/ramdisk"
|
|
|
|
xml_info['disk'] = xml_info['basepath'] + "/disk"
|
|
return xml_info
|
|
|
|
def to_xml(self, instance, rescue=False, network_info=None,
|
|
block_device_mapping=None):
|
|
block_device_mapping = block_device_mapping or []
|
|
# TODO(termie): cache?
|
|
LOG.debug(_('instance %s: starting toXML method'), instance['name'])
|
|
xml_info = self._prepare_xml_info(instance, rescue, network_info,
|
|
block_device_mapping)
|
|
xml = str(Template(self.libvirt_xml, searchList=[xml_info]))
|
|
LOG.debug(_('instance %s: finished toXML method'), instance['name'])
|
|
return xml
|
|
|
|
def _lookup_by_name(self, instance_name):
|
|
"""Retrieve libvirt domain object given an instance name.
|
|
|
|
All libvirt error handling should be handled in this method and
|
|
relevant nova exceptions should be raised in response.
|
|
|
|
"""
|
|
try:
|
|
return self._conn.lookupByName(instance_name)
|
|
except libvirt.libvirtError as ex:
|
|
error_code = ex.get_error_code()
|
|
if error_code == libvirt.VIR_ERR_NO_DOMAIN:
|
|
raise exception.InstanceNotFound(instance_id=instance_name)
|
|
|
|
msg = _("Error from libvirt while looking up %(instance_name)s: "
|
|
"[Error Code %(error_code)s] %(ex)s") % locals()
|
|
raise exception.Error(msg)
|
|
|
|
def get_info(self, instance_name):
|
|
"""Retrieve information from libvirt for a specific instance name.
|
|
|
|
If a libvirt error is encountered during lookup, we might raise a
|
|
NotFound exception or Error exception depending on how severe the
|
|
libvirt error is.
|
|
|
|
"""
|
|
virt_dom = self._lookup_by_name(instance_name)
|
|
(state, max_mem, mem, num_cpu, cpu_time) = virt_dom.info()
|
|
return {'state': state,
|
|
'max_mem': max_mem,
|
|
'mem': mem,
|
|
'num_cpu': num_cpu,
|
|
'cpu_time': cpu_time}
|
|
|
|
def _create_new_domain(self, xml, persistent=True, launch_flags=0):
|
|
# NOTE(justinsb): libvirt has two types of domain:
|
|
# * a transient domain disappears when the guest is shutdown
|
|
# or the host is rebooted.
|
|
# * a permanent domain is not automatically deleted
|
|
# NOTE(justinsb): Even for ephemeral instances, transient seems risky
|
|
|
|
if persistent:
|
|
# To create a persistent domain, first define it, then launch it.
|
|
domain = self._conn.defineXML(xml)
|
|
|
|
domain.createWithFlags(launch_flags)
|
|
else:
|
|
# createXML call creates a transient domain
|
|
domain = self._conn.createXML(xml, launch_flags)
|
|
|
|
return domain
|
|
|
|
def get_diagnostics(self, instance_name):
|
|
raise exception.ApiError(_("diagnostics are not supported "
|
|
"for libvirt"))
|
|
|
|
def get_disks(self, instance_name):
|
|
"""
|
|
Note that this function takes an instance name.
|
|
|
|
Returns a list of all block devices for this domain.
|
|
"""
|
|
domain = self._lookup_by_name(instance_name)
|
|
# TODO(devcamcar): Replace libxml2 with etree.
|
|
xml = domain.XMLDesc(0)
|
|
doc = None
|
|
|
|
try:
|
|
doc = libxml2.parseDoc(xml)
|
|
except Exception:
|
|
return []
|
|
|
|
ctx = doc.xpathNewContext()
|
|
disks = []
|
|
|
|
try:
|
|
ret = ctx.xpathEval('/domain/devices/disk')
|
|
|
|
for node in ret:
|
|
devdst = None
|
|
|
|
for child in node.children:
|
|
if child.name == 'target':
|
|
devdst = child.prop('dev')
|
|
|
|
if devdst is None:
|
|
continue
|
|
|
|
disks.append(devdst)
|
|
finally:
|
|
if ctx is not None:
|
|
ctx.xpathFreeContext()
|
|
if doc is not None:
|
|
doc.freeDoc()
|
|
|
|
return disks
|
|
|
|
def get_interfaces(self, instance_name):
|
|
"""
|
|
Note that this function takes an instance name.
|
|
|
|
Returns a list of all network interfaces for this instance.
|
|
"""
|
|
domain = self._lookup_by_name(instance_name)
|
|
# TODO(devcamcar): Replace libxml2 with etree.
|
|
xml = domain.XMLDesc(0)
|
|
doc = None
|
|
|
|
try:
|
|
doc = libxml2.parseDoc(xml)
|
|
except Exception:
|
|
return []
|
|
|
|
ctx = doc.xpathNewContext()
|
|
interfaces = []
|
|
|
|
try:
|
|
ret = ctx.xpathEval('/domain/devices/interface')
|
|
|
|
for node in ret:
|
|
devdst = None
|
|
|
|
for child in node.children:
|
|
if child.name == 'target':
|
|
devdst = child.prop('dev')
|
|
|
|
if devdst is None:
|
|
continue
|
|
|
|
interfaces.append(devdst)
|
|
finally:
|
|
if ctx is not None:
|
|
ctx.xpathFreeContext()
|
|
if doc is not None:
|
|
doc.freeDoc()
|
|
|
|
return interfaces
|
|
|
|
def get_vcpu_total(self):
|
|
"""Get vcpu number of physical computer.
|
|
|
|
:returns: the number of cpu core.
|
|
|
|
"""
|
|
|
|
# On certain platforms, this will raise a NotImplementedError.
|
|
try:
|
|
return multiprocessing.cpu_count()
|
|
except NotImplementedError:
|
|
LOG.warn(_("Cannot get the number of cpu, because this "
|
|
"function is not implemented for this platform. "
|
|
"This error can be safely ignored for now."))
|
|
return 0
|
|
|
|
def get_memory_mb_total(self):
|
|
"""Get the total memory size(MB) of physical computer.
|
|
|
|
:returns: the total amount of memory(MB).
|
|
|
|
"""
|
|
|
|
if sys.platform.upper() != 'LINUX2':
|
|
return 0
|
|
|
|
meminfo = open('/proc/meminfo').read().split()
|
|
idx = meminfo.index('MemTotal:')
|
|
# transforming kb to mb.
|
|
return int(meminfo[idx + 1]) / 1024
|
|
|
|
def get_local_gb_total(self):
|
|
"""Get the total hdd size(GB) of physical computer.
|
|
|
|
:returns:
|
|
The total amount of HDD(GB).
|
|
Note that this value shows a partition where
|
|
NOVA-INST-DIR/instances mounts.
|
|
|
|
"""
|
|
|
|
hddinfo = os.statvfs(FLAGS.instances_path)
|
|
return hddinfo.f_frsize * hddinfo.f_blocks / 1024 / 1024 / 1024
|
|
|
|
def get_vcpu_used(self):
|
|
""" Get vcpu usage number of physical computer.
|
|
|
|
:returns: The total number of vcpu that currently used.
|
|
|
|
"""
|
|
|
|
total = 0
|
|
for dom_id in self._conn.listDomainsID():
|
|
dom = self._conn.lookupByID(dom_id)
|
|
total += len(dom.vcpus()[1])
|
|
return total
|
|
|
|
def get_memory_mb_used(self):
|
|
"""Get the free memory size(MB) of physical computer.
|
|
|
|
:returns: the total usage of memory(MB).
|
|
|
|
"""
|
|
|
|
if sys.platform.upper() != 'LINUX2':
|
|
return 0
|
|
|
|
m = open('/proc/meminfo').read().split()
|
|
idx1 = m.index('MemFree:')
|
|
idx2 = m.index('Buffers:')
|
|
idx3 = m.index('Cached:')
|
|
avail = (int(m[idx1 + 1]) + int(m[idx2 + 1]) + int(m[idx3 + 1])) / 1024
|
|
return self.get_memory_mb_total() - avail
|
|
|
|
def get_local_gb_used(self):
|
|
"""Get the free hdd size(GB) of physical computer.
|
|
|
|
:returns:
|
|
The total usage of HDD(GB).
|
|
Note that this value shows a partition where
|
|
NOVA-INST-DIR/instances mounts.
|
|
|
|
"""
|
|
|
|
hddinfo = os.statvfs(FLAGS.instances_path)
|
|
avail = hddinfo.f_frsize * hddinfo.f_bavail / 1024 / 1024 / 1024
|
|
return self.get_local_gb_total() - avail
|
|
|
|
def get_hypervisor_type(self):
|
|
"""Get hypervisor type.
|
|
|
|
:returns: hypervisor type (ex. qemu)
|
|
|
|
"""
|
|
|
|
return self._conn.getType()
|
|
|
|
def get_hypervisor_version(self):
|
|
"""Get hypervisor version.
|
|
|
|
:returns: hypervisor version (ex. 12003)
|
|
|
|
"""
|
|
|
|
# NOTE(justinsb): getVersion moved between libvirt versions
|
|
# Trying to do be compatible with older versions is a lost cause
|
|
# But ... we can at least give the user a nice message
|
|
method = getattr(self._conn, 'getVersion', None)
|
|
if method is None:
|
|
raise exception.Error(_("libvirt version is too old"
|
|
" (does not support getVersion)"))
|
|
# NOTE(justinsb): If we wanted to get the version, we could:
|
|
# method = getattr(libvirt, 'getVersion', None)
|
|
# NOTE(justinsb): This would then rely on a proper version check
|
|
|
|
return method()
|
|
|
|
def get_cpu_info(self):
|
|
"""Get cpuinfo information.
|
|
|
|
Obtains cpu feature from virConnect.getCapabilities,
|
|
and returns as a json string.
|
|
|
|
:return: see above description
|
|
|
|
"""
|
|
|
|
xml = self._conn.getCapabilities()
|
|
xml = libxml2.parseDoc(xml)
|
|
nodes = xml.xpathEval('//host/cpu')
|
|
if len(nodes) != 1:
|
|
reason = _("'<cpu>' must be 1, but %d\n") % len(nodes)
|
|
reason += xml.serialize()
|
|
raise exception.InvalidCPUInfo(reason=reason)
|
|
|
|
cpu_info = dict()
|
|
|
|
arch_nodes = xml.xpathEval('//host/cpu/arch')
|
|
if arch_nodes:
|
|
cpu_info['arch'] = arch_nodes[0].getContent()
|
|
|
|
model_nodes = xml.xpathEval('//host/cpu/model')
|
|
if model_nodes:
|
|
cpu_info['model'] = model_nodes[0].getContent()
|
|
|
|
vendor_nodes = xml.xpathEval('//host/cpu/vendor')
|
|
if vendor_nodes:
|
|
cpu_info['vendor'] = vendor_nodes[0].getContent()
|
|
|
|
topology_nodes = xml.xpathEval('//host/cpu/topology')
|
|
topology = dict()
|
|
if topology_nodes:
|
|
topology_node = topology_nodes[0].get_properties()
|
|
while topology_node:
|
|
name = topology_node.get_name()
|
|
topology[name] = topology_node.getContent()
|
|
topology_node = topology_node.get_next()
|
|
|
|
keys = ['cores', 'sockets', 'threads']
|
|
tkeys = topology.keys()
|
|
if set(tkeys) != set(keys):
|
|
ks = ', '.join(keys)
|
|
reason = _("topology (%(topology)s) must have %(ks)s")
|
|
raise exception.InvalidCPUInfo(reason=reason % locals())
|
|
|
|
feature_nodes = xml.xpathEval('//host/cpu/feature')
|
|
features = list()
|
|
for nodes in feature_nodes:
|
|
features.append(nodes.get_properties().getContent())
|
|
|
|
cpu_info['topology'] = topology
|
|
cpu_info['features'] = features
|
|
return utils.dumps(cpu_info)
|
|
|
|
def block_stats(self, instance_name, disk):
|
|
"""
|
|
Note that this function takes an instance name.
|
|
"""
|
|
domain = self._lookup_by_name(instance_name)
|
|
return domain.blockStats(disk)
|
|
|
|
def interface_stats(self, instance_name, interface):
|
|
"""
|
|
Note that this function takes an instance name.
|
|
"""
|
|
domain = self._lookup_by_name(instance_name)
|
|
return domain.interfaceStats(interface)
|
|
|
|
def get_console_pool_info(self, console_type):
|
|
#TODO(mdragon): console proxy should be implemented for libvirt,
|
|
# in case someone wants to use it with kvm or
|
|
# such. For now return fake data.
|
|
return {'address': '127.0.0.1',
|
|
'username': 'fakeuser',
|
|
'password': 'fakepassword'}
|
|
|
|
def refresh_security_group_rules(self, security_group_id):
|
|
self.firewall_driver.refresh_security_group_rules(security_group_id)
|
|
|
|
def refresh_security_group_members(self, security_group_id):
|
|
self.firewall_driver.refresh_security_group_members(security_group_id)
|
|
|
|
def refresh_provider_fw_rules(self):
|
|
self.firewall_driver.refresh_provider_fw_rules()
|
|
|
|
def update_available_resource(self, ctxt, host):
|
|
"""Updates compute manager resource info on ComputeNode table.
|
|
|
|
This method is called when nova-coompute launches, and
|
|
whenever admin executes "nova-manage service update_resource".
|
|
|
|
:param ctxt: security context
|
|
:param host: hostname that compute manager is currently running
|
|
|
|
"""
|
|
|
|
try:
|
|
service_ref = db.service_get_all_compute_by_host(ctxt, host)[0]
|
|
except exception.NotFound:
|
|
raise exception.ComputeServiceUnavailable(host=host)
|
|
|
|
# Updating host information
|
|
dic = {'vcpus': self.get_vcpu_total(),
|
|
'memory_mb': self.get_memory_mb_total(),
|
|
'local_gb': self.get_local_gb_total(),
|
|
'vcpus_used': self.get_vcpu_used(),
|
|
'memory_mb_used': self.get_memory_mb_used(),
|
|
'local_gb_used': self.get_local_gb_used(),
|
|
'hypervisor_type': self.get_hypervisor_type(),
|
|
'hypervisor_version': self.get_hypervisor_version(),
|
|
'cpu_info': self.get_cpu_info()}
|
|
|
|
compute_node_ref = service_ref['compute_node']
|
|
if not compute_node_ref:
|
|
LOG.info(_('Compute_service record created for %s ') % host)
|
|
dic['service_id'] = service_ref['id']
|
|
db.compute_node_create(ctxt, dic)
|
|
else:
|
|
LOG.info(_('Compute_service record updated for %s ') % host)
|
|
db.compute_node_update(ctxt, compute_node_ref[0]['id'], dic)
|
|
|
|
def compare_cpu(self, cpu_info):
|
|
"""Checks the host cpu is compatible to a cpu given by xml.
|
|
|
|
"xml" must be a part of libvirt.openReadonly().getCapabilities().
|
|
return values follows by virCPUCompareResult.
|
|
if 0 > return value, do live migration.
|
|
'http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult'
|
|
|
|
:param cpu_info: json string that shows cpu feature(see get_cpu_info())
|
|
:returns:
|
|
None. if given cpu info is not compatible to this server,
|
|
raise exception.
|
|
|
|
"""
|
|
|
|
LOG.info(_('Instance launched has CPU info:\n%s') % cpu_info)
|
|
dic = utils.loads(cpu_info)
|
|
xml = str(Template(self.cpuinfo_xml, searchList=dic))
|
|
LOG.info(_('to xml...\n:%s ' % xml))
|
|
|
|
u = "http://libvirt.org/html/libvirt-libvirt.html#virCPUCompareResult"
|
|
m = _("CPU doesn't have compatibility.\n\n%(ret)s\n\nRefer to %(u)s")
|
|
# unknown character exists in xml, then libvirt complains
|
|
try:
|
|
ret = self._conn.compareCPU(xml, 0)
|
|
except libvirt.libvirtError, e:
|
|
ret = e.message
|
|
LOG.error(m % locals())
|
|
raise
|
|
|
|
if ret <= 0:
|
|
raise exception.InvalidCPUInfo(reason=m % locals())
|
|
|
|
return
|
|
|
|
def ensure_filtering_rules_for_instance(self, instance_ref,
|
|
time=None):
|
|
"""Setting up filtering rules and waiting for its completion.
|
|
|
|
To migrate an instance, filtering rules to hypervisors
|
|
and firewalls are inevitable on destination host.
|
|
( Waiting only for filterling rules to hypervisor,
|
|
since filtering rules to firewall rules can be set faster).
|
|
|
|
Concretely, the below method must be called.
|
|
- setup_basic_filtering (for nova-basic, etc.)
|
|
- prepare_instance_filter(for nova-instance-instance-xxx, etc.)
|
|
|
|
to_xml may have to be called since it defines PROJNET, PROJMASK.
|
|
but libvirt migrates those value through migrateToURI(),
|
|
so , no need to be called.
|
|
|
|
Don't use thread for this method since migration should
|
|
not be started when setting-up filtering rules operations
|
|
are not completed.
|
|
|
|
:params instance_ref: nova.db.sqlalchemy.models.Instance object
|
|
|
|
"""
|
|
|
|
if not time:
|
|
time = greenthread
|
|
|
|
# If any instances never launch at destination host,
|
|
# basic-filtering must be set here.
|
|
self.firewall_driver.setup_basic_filtering(instance_ref)
|
|
# setting up n)ova-instance-instance-xx mainly.
|
|
self.firewall_driver.prepare_instance_filter(instance_ref)
|
|
|
|
# wait for completion
|
|
timeout_count = range(FLAGS.live_migration_retry_count)
|
|
while timeout_count:
|
|
if self.firewall_driver.instance_filter_exists(instance_ref):
|
|
break
|
|
timeout_count.pop()
|
|
if len(timeout_count) == 0:
|
|
msg = _('Timeout migrating for %s. nwfilter not found.')
|
|
raise exception.Error(msg % instance_ref.name)
|
|
time.sleep(1)
|
|
|
|
def live_migration(self, ctxt, instance_ref, dest,
|
|
post_method, recover_method):
|
|
"""Spawning live_migration operation for distributing high-load.
|
|
|
|
:params ctxt: security context
|
|
:params instance_ref:
|
|
nova.db.sqlalchemy.models.Instance object
|
|
instance object that is migrated.
|
|
:params dest: destination host
|
|
:params post_method:
|
|
post operation method.
|
|
expected nova.compute.manager.post_live_migration.
|
|
:params recover_method:
|
|
recovery method when any exception occurs.
|
|
expected nova.compute.manager.recover_live_migration.
|
|
|
|
"""
|
|
|
|
greenthread.spawn(self._live_migration, ctxt, instance_ref, dest,
|
|
post_method, recover_method)
|
|
|
|
def _live_migration(self, ctxt, instance_ref, dest,
|
|
post_method, recover_method):
|
|
"""Do live migration.
|
|
|
|
:params ctxt: security context
|
|
:params instance_ref:
|
|
nova.db.sqlalchemy.models.Instance object
|
|
instance object that is migrated.
|
|
:params dest: destination host
|
|
:params post_method:
|
|
post operation method.
|
|
expected nova.compute.manager.post_live_migration.
|
|
:params recover_method:
|
|
recovery method when any exception occurs.
|
|
expected nova.compute.manager.recover_live_migration.
|
|
|
|
"""
|
|
|
|
# Do live migration.
|
|
try:
|
|
flaglist = FLAGS.live_migration_flag.split(',')
|
|
flagvals = [getattr(libvirt, x.strip()) for x in flaglist]
|
|
logical_sum = reduce(lambda x, y: x | y, flagvals)
|
|
|
|
if self.read_only:
|
|
tmpconn = self._connect(self.libvirt_uri, False)
|
|
dom = tmpconn.lookupByName(instance_ref.name)
|
|
dom.migrateToURI(FLAGS.live_migration_uri % dest,
|
|
logical_sum,
|
|
None,
|
|
FLAGS.live_migration_bandwidth)
|
|
tmpconn.close()
|
|
else:
|
|
dom = self._conn.lookupByName(instance_ref.name)
|
|
dom.migrateToURI(FLAGS.live_migration_uri % dest,
|
|
logical_sum,
|
|
None,
|
|
FLAGS.live_migration_bandwidth)
|
|
|
|
except Exception:
|
|
recover_method(ctxt, instance_ref, dest=dest)
|
|
raise
|
|
|
|
# Waiting for completion of live_migration.
|
|
timer = utils.LoopingCall(f=None)
|
|
|
|
def wait_for_live_migration():
|
|
"""waiting for live migration completion"""
|
|
try:
|
|
self.get_info(instance_ref.name)['state']
|
|
except exception.NotFound:
|
|
timer.stop()
|
|
post_method(ctxt, instance_ref, dest)
|
|
|
|
timer.f = wait_for_live_migration
|
|
timer.start(interval=0.5, now=True)
|
|
|
|
def unfilter_instance(self, instance_ref, network_info):
|
|
"""See comments of same method in firewall_driver."""
|
|
self.firewall_driver.unfilter_instance(instance_ref,
|
|
network_info=network_info)
|
|
|
|
def update_host_status(self):
|
|
"""See xenapi_conn.py implementation."""
|
|
pass
|
|
|
|
def get_host_stats(self, refresh=False):
|
|
"""See xenapi_conn.py implementation."""
|
|
pass
|
|
|
|
def host_power_action(self, host, action):
|
|
"""Reboots or shuts down the host."""
|
|
pass
|
|
|
|
def set_host_enabled(self, host, enabled):
|
|
"""Sets the specified host's ability to accept new instances."""
|
|
pass
|