Esempio n. 1
0
def cast_to_network_host(context, host, method, update_db=False, **kwargs):
    """Cast request to a network host queue"""

    rpc.cast(context,
            db.queue_get_for(context, 'network', host),
            {"method": method, "args": kwargs})
    LOG.debug(_("Casted '%(method)s' to network '%(host)s'") % locals())
Esempio n. 2
0
    def mounted_on_same_shared_storage(self, context, instance_ref, dest):
        """Check if the src and dest host mount same shared storage.

        At first, dest host creates temp file, and src host can see
        it if they mounts same shared storage. Then src host erase it.

        :param context: security context
        :param instance_ref: engine.db.sqlalchemy.models.Instance object
        :param dest: destination host

        """

        src = instance_ref['host']
        dst_t = db.queue_get_for(context, FLAGS.compute_topic, dest)
        src_t = db.queue_get_for(context, FLAGS.compute_topic, src)

        filename = None

        try:
            # create tmpfile at dest host
            filename = rpc.call(context, dst_t,
                                {"method": 'create_shared_storage_test_file'})

            # make sure existence at src host.
            ret = rpc.call(context, src_t,
                          {"method": 'check_shared_storage_test_file',
                           "args": {'filename': filename}})
            if not ret:
                raise exception.FileNotFound(file_path=filename)

        except exception.FileNotFound:
            raise

        finally:
            # Should only be None for tests?
            if filename is not None:
                rpc.call(context, dst_t,
                         {"method": 'cleanup_shared_storage_test_file',
                          "args": {'filename': filename}})
Esempio n. 3
0
def cast_to_volume_host(context, host, method, update_db=True, **kwargs):
    """Cast request to a volume host queue"""

    if update_db:
        volume_id = kwargs.get('volume_id', None)
        if volume_id is not None:
            now = utils.utcnow()
            db.volume_update(context, volume_id,
                    {'host': host, 'scheduled_at': now})
    rpc.cast(context,
            db.queue_get_for(context, 'volume', host),
            {"method": method, "args": kwargs})
    LOG.debug(_("Casted '%(method)s' to volume '%(host)s'") % locals())
Esempio n. 4
0
def cast_to_compute_host(context, host, method, update_db=True, **kwargs):
    """Cast request to a compute host queue"""

    if update_db:
        # fall back on the id if the uuid is not present
        instance_id = kwargs.get('instance_id', None)
        instance_uuid = kwargs.get('instance_uuid', instance_id)
        if instance_uuid is not None:
            now = utils.utcnow()
            db.instance_update(context, instance_uuid,
                    {'host': host, 'scheduled_at': now})
    rpc.cast(context,
            db.queue_get_for(context, 'compute', host),
            {"method": method, "args": kwargs})
    LOG.debug(_("Casted '%(method)s' to compute '%(host)s'") % locals())
Esempio n. 5
0
def cast_to_host(context, topic, host, method, update_db=True, **kwargs):
    """Generic cast to host"""

    topic_mapping = {
            "compute": cast_to_compute_host,
            "volume": cast_to_volume_host,
            'network': cast_to_network_host}

    func = topic_mapping.get(topic)
    if func:
        func(context, host, method, update_db=update_db, **kwargs)
    else:
        rpc.cast(context,
            db.queue_get_for(context, topic, host),
                {"method": method, "args": kwargs})
        LOG.debug(_("Casted '%(method)s' to %(topic)s '%(host)s'")
                % locals())
Esempio n. 6
0
    def _live_migration_common_check(self, context, instance_ref, dest,
                                     block_migration):
        """Live migration common check routine.

        Below checkings are followed by
        http://wiki.libvirt.org/page/TodoPreMigrationChecks

        :param context: security context
        :param instance_ref: engine.db.sqlalchemy.models.Instance object
        :param dest: destination host
        :param block_migration if True, check for block_migration.

        """

        # Checking shared storage connectivity
        # if block migration, instances_paths should not be on shared storage.
        try:
            self.mounted_on_same_shared_storage(context, instance_ref, dest)
            if block_migration:
                reason = _("Block migration can not be used "
                           "with shared storage.")
                raise exception.InvalidSharedStorage(reason=reason, path=dest)
        except exception.FileNotFound:
            if not block_migration:
                src = instance_ref['host']
                ipath = FLAGS.instances_path
                LOG.error(_("Cannot confirm tmpfile at %(ipath)s is on "
                                "same shared storage between %(src)s "
                                "and %(dest)s.") % locals())
                raise

        # Checking dest exists.
        dservice_refs = db.service_get_all_compute_by_host(context, dest)
        dservice_ref = dservice_refs[0]['compute_node'][0]

        # Checking original host( where instance was launched at) exists.
        try:
            oservice_refs = db.service_get_all_compute_by_host(context,
                                           instance_ref['launched_on'])
        except exception.NotFound:
            raise exception.SourceHostUnavailable()
        oservice_ref = oservice_refs[0]['compute_node'][0]

        # Checking hypervisor is same.
        orig_hypervisor = oservice_ref['hypervisor_type']
        dest_hypervisor = dservice_ref['hypervisor_type']
        if orig_hypervisor != dest_hypervisor:
            raise exception.InvalidHypervisorType()

        # Checkng hypervisor version.
        orig_hypervisor = oservice_ref['hypervisor_version']
        dest_hypervisor = dservice_ref['hypervisor_version']
        if orig_hypervisor > dest_hypervisor:
            raise exception.DestinationHypervisorTooOld()

        # Checking cpuinfo.
        try:
            rpc.call(context,
                     db.queue_get_for(context, FLAGS.compute_topic, dest),
                     {"method": 'compare_cpu',
                      "args": {'cpu_info': oservice_ref['cpu_info']}})

        except rpc.RemoteError:
            src = instance_ref['host']
            LOG.exception(_("host %(dest)s is not compatible with "
                                "original host %(src)s.") % locals())
            raise