servers.py 24.6 KB
Newer Older
1
2
3
4
5
6
7
8
9
import logging

from socket import getfqdn
from functools import wraps
from django import dispatch
from django.db import transaction
from django.utils import simplejson as json

from snf_django.lib.api import faults
10
from django.conf import settings
11
12
from synnefo import quotas
from synnefo.api import util
Christos Stavrakakis's avatar
Christos Stavrakakis committed
13
from synnefo.logic import backend, ips
14
from synnefo.logic.backend_allocator import BackendAllocator
15
from synnefo.db.models import (NetworkInterface, VirtualMachine,
16
                               VirtualMachineMetadata, IPAddressLog, Network)
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
from vncauthproxy.client import request_forwarding as request_vnc_forwarding

log = logging.getLogger(__name__)

# server creation signal
server_created = dispatch.Signal(providing_args=["created_vm_params"])


def validate_server_action(vm, action):
    if vm.deleted:
        raise faults.BadRequest("Server '%s' has been deleted." % vm.id)

    # Destroyin a server should always be permitted
    if action == "DESTROY":
        return

    # Check that there is no pending action
    pending_action = vm.task
    if pending_action:
        if pending_action == "BUILD":
            raise faults.BuildInProgress("Server '%s' is being build." % vm.id)
38
        raise faults.BadRequest("Cannot perform '%s' action while there is a"
39
40
41
42
                                " pending '%s'." % (action, pending_action))

    # Check if action can be performed to VM's operstate
    operstate = vm.operstate
43
    if operstate == "ERROR":
44
        raise faults.BadRequest("Cannot perform '%s' action while server is"
45
46
                                " in 'ERROR' state." % action)
    elif operstate == "BUILD" and action != "BUILD":
47
        raise faults.BuildInProgress("Server '%s' is being build." % vm.id)
48
49
50
51
52
    elif (action == "START" and operstate != "STOPPED") or\
         (action == "STOP" and operstate != "STARTED") or\
         (action == "RESIZE" and operstate != "STOPPED") or\
         (action in ["CONNECT", "DISCONNECT"] and operstate != "STOPPED"
          and not settings.GANETI_USE_HOTPLUG):
53
        raise faults.BadRequest("Cannot perform '%s' action while server is"
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
                                " in '%s' state." % (action, operstate))
    return


def server_command(action):
    """Handle execution of a server action.

    Helper function to validate and execute a server action, handle quota
    commission and update the 'task' of the VM in the DB.

    1) Check if action can be performed. If it can, then there must be no
       pending task (with the exception of DESTROY).
    2) Handle previous commission if unresolved:
       * If it is not pending and it to accept, then accept
       * If it is not pending and to reject or is pending then reject it. Since
       the action can be performed only if there is no pending task, then there
       can be no pending commission. The exception is DESTROY, but in this case
       the commission can safely be rejected, and the dispatcher will generate
       the correct ones!
    3) Issue new commission and associate it with the VM. Also clear the task.
    4) Send job to ganeti
    5) Update task and commit
    """
    def decorator(func):
        @wraps(func)
        @transaction.commit_on_success
        def wrapper(vm, *args, **kwargs):
            user_id = vm.userid
            validate_server_action(vm, action)
83
            vm.action = action
84

85
86
87
88
            commission_name = "client: api, resource: %s" % vm
            quotas.handle_resource_commission(vm, action=action,
                                              commission_name=commission_name)
            vm.save()
89

90
91
92
93
94
95
96
97
98
99
100
            # XXX: Special case for server creation!
            if action == "BUILD":
                # Perform a commit, because the VirtualMachine must be saved to
                # DB before the OP_INSTANCE_CREATE job in enqueued in Ganeti.
                # Otherwise, messages will arrive from snf-dispatcher about
                # this instance, before the VM is stored in DB.
                transaction.commit()
                # After committing the locks are released. Refetch the instance
                # to guarantee x-lock.
                vm = VirtualMachine.objects.select_for_update().get(id=vm.id)

101
102
103
104
105
106
107
108
109
110
111
112
113
            # Send the job to Ganeti and get the associated jobID
            try:
                job_id = func(vm, *args, **kwargs)
            except Exception as e:
                if vm.serial is not None:
                    # Since the job never reached Ganeti, reject the commission
                    log.debug("Rejecting commission: '%s', could not perform"
                              " action '%s': %s" % (vm.serial,  action, e))
                    transaction.rollback()
                    quotas.reject_serial(vm.serial)
                    transaction.commit()
                raise

114
115
116
117
118
119
120
            if action == "BUILD" and vm.serial is not None:
                # XXX: Special case for server creation: we must accept the
                # commission because the VM has been stored in DB. Also, if
                # communication with Ganeti fails, the job will never reach
                # Ganeti, and the commission will never be resolved.
                quotas.accept_serial(vm.serial)

121
122
123
124
125
126
127
128
129
130
131
132
133
134
            log.info("user: %s, vm: %s, action: %s, job_id: %s, serial: %s",
                     user_id, vm.id, action, job_id, vm.serial)

            # store the new task in the VM
            if job_id is not None:
                vm.task = action
                vm.task_job_id = job_id
            vm.save()

            return vm
        return wrapper
    return decorator


135
@transaction.commit_on_success
136
def create(userid, name, password, flavor, image, metadata={},
137
           personality=[], networks=None, use_backend=None):
138
    if use_backend is None:
139
140
        # Allocate server to a Ganeti backend
        use_backend = allocate_new_server(userid, flavor)
141

142
143
144
145
146
    # Create the ports for the server
    try:
        ports = create_instance_ports(userid, networks)
    except Exception as e:
        raise e
147

148
149
150
151
152
153
154
155
156
157
158
159
    # Fix flavor for archipelago
    disk_template, provider = util.get_flavor_provider(flavor)
    if provider:
        flavor.disk_template = disk_template
        flavor.disk_provider = provider
        flavor.disk_origin = None
        if provider == 'vlmc':
            flavor.disk_origin = image['checksum']
            image['backend_id'] = 'null'
    else:
        flavor.disk_provider = None

160
161
162
163
164
165
166
167
168
169
    # We must save the VM instance now, so that it gets a valid
    # vm.backend_vm_id.
    vm = VirtualMachine.objects.create(name=name,
                                       backend=use_backend,
                                       userid=userid,
                                       imageid=image["id"],
                                       flavor=flavor,
                                       operstate="BUILD")
    log.info("Created entry in DB for VM '%s'", vm)

170
171
172
173
174
    # Associate the ports with the server
    for index, port in enumerate(ports):
        associate_port_with_machine(port, vm)
        port.index = index
        port.save()
175
176
177
178
179
180

    for key, val in metadata.items():
        VirtualMachineMetadata.objects.create(
            meta_key=key,
            meta_value=val,
            vm=vm)
181

182
    # Create the server in Ganeti.
183
    vm = create_server(vm, ports, flavor, image, personality, password)
184
185
186
187

    return vm


188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
@transaction.commit_on_success
def allocate_new_server(userid, flavor):
    """Allocate a new server to a Ganeti backend.

    Allocation is performed based on the owner of the server and the specified
    flavor. Also, backends that do not have a public IPv4 address are excluded
    from server allocation.

    This function runs inside a transaction, because after allocating the
    instance a commit must be performed in order to release all locks.

    """
    backend_allocator = BackendAllocator()
    use_backend = backend_allocator.allocate(userid, flavor)
    if use_backend is None:
        log.error("No available backend for VM with flavor %s", flavor)
        raise faults.ServiceUnavailable("No available backends")
    return use_backend


@server_command("BUILD")
def create_server(vm, nics, flavor, image, personality, password):
    # dispatch server created signal needed to trigger the 'vmapi', which
    # enriches the vm object with the 'config_url' attribute which must be
    # passed to the Ganeti job.
    server_created.send(sender=vm, created_vm_params={
        'img_id': image['backend_id'],
        'img_passwd': password,
        'img_format': str(image['format']),
        'img_personality': json.dumps(personality),
        'img_properties': json.dumps(image['metadata']),
    })
    # send job to Ganeti
221
222
223
224
225
226
227
228
229
230
    try:
        jobID = backend.create_instance(vm, nics, flavor, image)
    except:
        log.exception("Failed create instance '%s'", vm)
        jobID = None
        vm.operstate = "ERROR"
        vm.backendlogmsg = "Failed to send job to Ganeti."
        vm.save()
        vm.nics.all().update(state="ERROR")

231
232
233
234
235
236
237
238
239
    # At this point the job is enqueued in the Ganeti backend
    vm.backendjobid = jobID
    vm.save()
    log.info("User %s created VM %s, NICs %s, Backend %s, JobID %s",
             vm.userid, vm, nics, backend, str(jobID))

    return jobID


240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
@server_command("DESTROY")
def destroy(vm):
    log.info("Deleting VM %s", vm)
    return backend.delete_instance(vm)


@server_command("START")
def start(vm):
    log.info("Starting VM %s", vm)
    return backend.startup_instance(vm)


@server_command("STOP")
def stop(vm):
    log.info("Stopping VM %s", vm)
    return backend.shutdown_instance(vm)


@server_command("REBOOT")
def reboot(vm, reboot_type):
    if reboot_type not in ("SOFT", "HARD"):
        raise faults.BadRequest("Malformed request. Invalid reboot"
                                " type %s" % reboot_type)
    log.info("Rebooting VM %s. Type %s", vm, reboot_type)

    return backend.reboot_instance(vm, reboot_type.lower())


@server_command("RESIZE")
def resize(vm, flavor):
    old_flavor = vm.flavor
    # User requested the same flavor
    if old_flavor.id == flavor.id:
        raise faults.BadRequest("Server '%s' flavor is already '%s'."
                                % (vm, flavor))
        return None
    # Check that resize can be performed
    if old_flavor.disk != flavor.disk:
278
        raise faults.BadRequest("Cannot resize instance disk.")
279
    if old_flavor.disk_template != flavor.disk_template:
280
        raise faults.BadRequest("Cannot change instance disk template.")
281
282
283

    log.info("Resizing VM from flavor '%s' to '%s", old_flavor, flavor)
    commission_info = {"cyclades.cpu": flavor.cpu - old_flavor.cpu,
284
                       "cyclades.ram": 1048576 * (flavor.ram - old_flavor.ram)}
285
286
287
    # Save serial to VM, since it is needed by server_command decorator
    vm.serial = quotas.issue_commission(user=vm.userid,
                                        source=quotas.DEFAULT_SOURCE,
288
289
                                        provisions=commission_info,
                                        name="resource: %s. resize" % vm)
290
291
292
293
    return backend.resize_instance(vm, vcpus=flavor.cpu, memory=flavor.ram)


@server_command("SET_FIREWALL_PROFILE")
294
295
def set_firewall_profile(vm, profile, nic):
    log.info("Setting VM %s, NIC %s, firewall %s", vm, nic, profile)
296
297
298

    if profile not in [x[0] for x in NetworkInterface.FIREWALL_PROFILES]:
        raise faults.BadRequest("Unsupported firewall profile")
299
    backend.set_firewall_profile(vm, profile=profile, nic=nic)
300
301
302
303
    return None


@server_command("CONNECT")
304
305
def connect(vm, network, port=None):
    if port is None:
306
307
        port = _create_port(vm.userid, network)
    associate_port_with_machine(port, vm)
308

309
    log.info("Creating NIC %s with IPv4 Address %s", port, port.ipv4_address)
310

311
    return backend.connect_to_network(vm, port)
312
313
314


@server_command("DISCONNECT")
315
316
def disconnect(vm, nic):
    log.info("Removing NIC %s from VM %s", nic, vm)
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
    return backend.disconnect_from_network(vm, nic)


def console(vm, console_type):
    """Arrange for an OOB console of the specified type

    This method arranges for an OOB console of the specified type.
    Only consoles of type "vnc" are supported for now.

    It uses a running instance of vncauthproxy to setup proper
    VNC forwarding with a random password, then returns the necessary
    VNC connection info to the caller.

    """
    log.info("Get console  VM %s, type %s", vm, console_type)

    # Use RAPI to get VNC console information for this instance
    if vm.operstate != "STARTED":
        raise faults.BadRequest('Server not in ACTIVE state.')

    if settings.TEST:
        console_data = {'kind': 'vnc', 'host': 'ganeti_node', 'port': 1000}
    else:
        console_data = backend.get_instance_console(vm)

    if console_data['kind'] != 'vnc':
        message = 'got console of kind %s, not "vnc"' % console_data['kind']
        raise faults.ServiceUnavailable(message)

    # Let vncauthproxy decide on the source port.
    # The alternative: static allocation, e.g.
    # sport = console_data['port'] - 1000
    sport = 0
    daddr = console_data['host']
    dport = console_data['port']
    password = util.random_password()

    if settings.TEST:
        fwd = {'source_port': 1234, 'status': 'OK'}
    else:
        fwd = request_vnc_forwarding(sport, daddr, dport, password)

    if fwd['status'] != "OK":
        raise faults.ServiceUnavailable('vncauthproxy returned error status')

    # Verify that the VNC server settings haven't changed
    if not settings.TEST:
        if console_data != backend.get_instance_console(vm):
            raise faults.ServiceUnavailable('VNC Server settings changed.')

    console = {
        'type': 'vnc',
        'host': getfqdn(),
        'port': fwd['source_port'],
        'password': password}

    return console
374
375


376
377
378
379
380
381
382
383
def rename(server, new_name):
    """Rename a VirtualMachine."""
    old_name = server.name
    server.name = new_name
    server.save()
    log.info("Renamed server '%s' from '%s' to '%s'", server, old_name,
             new_name)
    return server
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403


@transaction.commit_on_success
def create_port(*args, **kwargs):
    return _create_port(*args, **kwargs)


def _create_port(userid, network, machine=None, use_ipaddress=None,
                 address=None, name="", security_groups=None,
                 device_owner=None):
    """Create a new port on the specified network.

    Create a new Port(NetworkInterface model) on the specified Network. If
    'machine' is specified, the machine will be connected to the network using
    this port. If 'use_ipaddress' argument is specified, the port will be
    assigned this IPAddress. Otherwise, an IPv4 address from the IPv4 subnet
    will be allocated.

    """
    if network.state != "ACTIVE":
404
        raise faults.BuildInProgress("Cannot create port while network is in"
405
                                     " state %s" % network.state)
406
    if network.action == "DESTROY":
407
        msg = "Cannot create port. Network %s is being deleted."
408
        raise faults.Conflict(msg % network.id)
409
410
411
412
413
414
415
416
417
418
419
    ipaddress = None
    if use_ipaddress is not None:
        # Use an existing IPAddress object.
        ipaddress = use_ipaddress
        if ipaddress and (ipaddress.network_id != network.id):
            msg = "IP Address %s does not belong to network %s"
            raise faults.Conflict(msg % (ipaddress.address, network.id))
    else:
        # If network has IPv4 subnets, try to allocate the address that the
        # the user specified or a random one.
        if network.subnets.filter(ipversion=4).exists():
Christos Stavrakakis's avatar
Christos Stavrakakis committed
420
421
            ipaddress = ips.allocate_ip(network, userid=userid,
                                        address=address)
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
        elif address is not None:
            raise faults.BadRequest("Address %s is not a valid IP for the"
                                    " defined network subnets" % address)

    if ipaddress is not None and ipaddress.nic is not None:
        raise faults.Conflict("IP address '%s' is already in use" %
                              ipaddress.address)

    port = NetworkInterface.objects.create(network=network,
                                           state="DOWN",
                                           userid=userid,
                                           device_owner=None,
                                           name=name)

    # add the security groups if any
    if security_groups:
        port.security_groups.add(*security_groups)

    if ipaddress is not None:
        # Associate IPAddress with the Port
        ipaddress.nic = port
        ipaddress.save()

    if machine is not None:
446
        # Connect port to the instance.
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
        machine = connect(machine, network, port)
        jobID = machine.task_job_id
        log.info("Created Port %s with IP %s. Ganeti Job: %s",
                 port, ipaddress, jobID)
    else:
        log.info("Created Port %s with IP %s not attached to any instance",
                 port, ipaddress)

    return port


def associate_port_with_machine(port, machine):
    """Associate a Port with a VirtualMachine.

    Associate the port with the VirtualMachine and add an entry to the
    IPAddressLog if the port has a public IPv4 address from a public network.

    """
465
466
    if port.machine is not None:
        raise faults.Conflict("Port %s is already in use." % port.id)
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
    if port.network.public:
        ipv4_address = port.ipv4_address
        if ipv4_address is not None:
            ip_log = IPAddressLog.objects.create(server_id=machine.id,
                                                 network_id=port.network_id,
                                                 address=ipv4_address,
                                                 active=True)
            log.debug("Created IP log entry %s", ip_log)
    port.machine = machine
    port.state = "BUILD"
    port.device_owner = "vm"
    port.save()
    return port


@transaction.commit_on_success
def delete_port(port):
    """Delete a port by removing the NIC card from the instance.

    Send a Job to remove the NIC card from the instance. The port
    will be deleted and the associated IPv4 addressess will be released
488
489
490
    when the job completes successfully. Deleting port that is connected to
    a public network is allowed only if the port has an associated floating IP
    address.
491
492
493

    """

494
495
    if port.network.public and not port.ips.filter(floating_ip=True,
                                                   deleted=False).exists():
496
        raise faults.Forbidden("Cannot disconnect from public network.")
497

498
499
500
501
502
503
504
505
506
    if port.machine is not None:
        vm = disconnect(port.machine, port)
        log.info("Removing port %s, Job: %s", port, vm.task_job_id)
    else:
        backend.remove_nic_ips(port)
        port.delete()
        log.info("Removed port %s", port)

    return port
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656


def create_instance_ports(user_id, networks=None):
    # First connect the instance to the networks defined by the admin
    forced_ports = create_ports_for_setting(user_id, category="admin")
    if networks is None:
        # If the user did not asked for any networks, connect instance to
        # default networks as defined by the admin
        ports = create_ports_for_setting(user_id, category="default")
    else:
        # Else just connect to the networks that the user defined
        ports = create_ports_for_request(user_id, networks)
    return forced_ports + ports


def create_ports_for_setting(user_id, category):
    if category == "admin":
        network_setting = settings.CYCLADES_FORCED_SERVER_NETWORKS
    elif category == "default":
        network_setting = settings.CYCLADES_DEFAULT_SERVER_NETWORKS
    else:
        raise ValueError("Unknown category: %s" % category)

    ports = []
    for network_ids in network_setting:
        # Treat even simple network IDs as group of networks with one network
        if type(network_ids) not in (list, tuple):
            network_ids = [network_ids]

        for network_id in network_ids:
            try:
                ports.append(_port_from_setting(user_id, network_id, category))
                break
            except faults.Conflict:
                # Try all network IDs in the network group
                pass

            # Diffrent exception for each category!
            if category == "admin":
                exception = faults.ServiceUnavailable
            else:
                exception = faults.Conflict
            raise exception("Cannot connect instance to any of the following"
                            " networks %s" % network_ids)
    return ports


def _port_from_setting(user_id, network_id, category):
    # TODO: Fix this..you need only IPv4 and only IPv6 network
    if network_id == "SNF:ANY_PUBLIC_IPV4":
        return create_public_ipv4_port(user_id, category=category)
    elif network_id == "SNF:ANY_PUBLIC_IPV6":
        return create_public_ipv6_port(user_id, category=category)
    elif network_id == "SNF:ANY_PUBLIC":
        try:
            return create_public_ipv4_port(user_id, category=category)
        except faults.Conflict:
            return create_public_ipv6_port(user_id, category=category)
    else:  # Case of network ID
        if category in ["user", "default"]:
            return _port_for_request(user_id, {"uuid": network_id})
        elif category == "admin":
            network = util.get_network(network_id, user_id, non_deleted=True)
            return _create_port(user_id, network)
        else:
            raise ValueError("Unknown category: %s" % category)


def create_public_ipv4_port(user_id, network=None, address=None,
                            category="user"):
    """Create a port in a public IPv4 network.

    Create a port in a public IPv4 network (that may also have an IPv6
    subnet). If the category is 'user' or 'default' this will try to use
    one of the users floating IPs. If the category is 'admin' will
    create a port to the public network (without floating IPs or quotas).

    """
    if category in ["user", "default"]:
        if address is None:
            ipaddress = ips.get_free_floating_ip(user_id, network)
        else:
            ipaddress = util.get_floating_ip_by_address(user_id, address,
                                                        for_update=True)
    elif category == "admin":
        if network is None:
            ipaddress = ips.allocate_public_ip(user_id)
        else:
            ipaddress = ips.allocate_ip(network, user_id)
    else:
        raise ValueError("Unknown category: %s" % category)
    if network is None:
        network = ipaddress.network
    return _create_port(user_id, network, use_ipaddress=ipaddress)


def create_public_ipv6_port(user_id, category=None):
    """Create a port in a public IPv6 only network."""
    networks = Network.objects.filter(public=True, deleted=False,
                                      drained=False, subnets__ipversion=6)\
                              .exclude(subnets__ipversion=4)
    if networks:
        return _create_port(user_id, networks[0])
    else:
        msg = "No available IPv6 only network!"
        log.error(msg)
        raise faults.Conflict(msg)


def create_ports_for_request(user_id, networks):
    """Create the server ports requested by the user.

    Create the ports for the new servers as requested in the 'networks'
    attribute. The networks attribute contains either a list of network IDs
    ('uuid') or a list of ports IDs ('port'). In case of network IDs, the user
    can also specify an IPv4 address ('fixed_ip'). In order to connect to a
    public network, the 'fixed_ip' attribute must contain the IPv4 address of a
    floating IP. If the network is public but the 'fixed_ip' attribute is not
    specified, the system will automatically reserve one of the users floating
    IPs.

    """
    return [_port_for_request(user_id, network) for network in networks]


def _port_for_request(user_id, network_dict):
    port_id = network_dict.get("port")
    network_id = network_dict.get("uuid")
    if port_id is not None:
        return util.get_port(port_id, user_id, for_update=True)
    elif network_id is not None:
        address = network_dict.get("fixed_ip")
        network = util.get_network(network_id, user_id, non_deleted=True)
        if network.public:
            if network.subnet4 is not None:
                if not "fixed_ip" in network_dict:
                    return create_public_ipv4_port(user_id, network)
                elif address is None:
                    msg = "Cannot connect to public network"
                    raise faults.BadRequest(msg % network.id)
                else:
                    return create_public_ipv4_port(user_id, network, address)
            else:
                raise faults.Forbidden("Cannot connect to IPv6 only public"
                                       " network %" % network.id)
        else:
            return _create_port(user_id, network, address=address)
    else:
        raise faults.BadRequest("Network 'uuid' or 'port' attribute"
                                " is required.")