servers.py 18 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
13
14
from synnefo import quotas
from synnefo.api import util
from synnefo.logic import backend
from synnefo.logic.backend_allocator import BackendAllocator
15
16
17
from synnefo.db.models import (NetworkInterface, VirtualMachine,
                               VirtualMachineMetadata, IPAddress)
from synnefo.db import query as db_query, pools
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

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)
        raise faults.BadRequest("Can not perform '%s' action while there is a"
                                " pending '%s'." % (action, pending_action))

    # Check if action can be performed to VM's operstate
    operstate = vm.operstate
45
    if operstate == "BUILD" and action != "BUILD":
46
        raise faults.BuildInProgress("Server '%s' is being build." % vm.id)
47
48
49
50
51
    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):
52
53
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
        raise faults.BadRequest("Can not perform '%s' action while server is"
                                " 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)
82
            vm.action = action
83

84
85
86
87
            commission_name = "client: api, resource: %s" % vm
            quotas.handle_resource_commission(vm, action=action,
                                              commission_name=commission_name)
            vm.save()
88

89
90
91
92
93
94
95
96
97
98
99
            # 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)

100
101
102
103
104
105
106
107
108
109
110
111
112
            # 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

113
114
115
116
117
118
119
            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)

120
121
122
123
124
125
126
127
128
129
130
131
132
133
            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


134
@transaction.commit_on_success
135
def create(userid, name, password, flavor, image, metadata={},
136
137
           personality=[], private_networks=None, floating_ips=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
    if private_networks is None:
        private_networks = []
    if floating_ips is None:
        floating_ips = []

147
148
149
150
151
152
153
154
155
156
157
158
    # 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

159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
    # 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)

    nics = create_instance_nics(vm, userid, private_networks, floating_ips)

    for key, val in metadata.items():
        VirtualMachineMetadata.objects.create(
            meta_key=key,
            meta_value=val,
            vm=vm)
176

177
    # Create the server in Ganeti.
178
    vm = create_server(vm, nics, flavor, image, personality, password)
179
180
181
182

    return vm


183
184
185
186
187
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
@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
216
217
218
219
220
221
222
223
224
225
    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")

226
227
228
229
230
231
232
233
234
    # 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


235
def create_instance_nics(vm, userid, private_networks=[], floating_ips=[]):
236
237
238
239
240
241
242
243
    """Create NICs for VirtualMachine.

    Helper function for allocating IP addresses and creating NICs in the DB
    for a VirtualMachine. Created NICs are the combination of the default
    network policy (defined by administration settings) and the private
    networks defined by the user.

    """
244
    nics = []
245
    for network_id in settings.DEFAULT_INSTANCE_NETWORKS:
246
        if network_id == "SNF:ANY_PUBLIC":
247
248
249
            ipaddress = util.allocate_public_ip(userid=userid,
                                                backend=vm.backend)
            nic, ipaddress = create_nic(vm, ipaddress=ipaddress)
250
251
        else:
            try:
252
253
254
                network = util.get_network(network_id, userid,
                                           non_deleted=True)
            except faults.ItemNotFound:
255
256
257
258
                msg = "Invalid configuration. Setting"\
                      " 'DEFAULT_INSTANCE_NETWORKS' contains invalid"\
                      " network '%s'" % network_id
                log.error(msg)
259
260
261
                raise faults.InternalServerError(msg)
            nic, ipaddress = create_nic(vm, network=network)
        nics.append(nic)
262
    for address in floating_ips:
263
264
265
266
        floating_ip = util.get_floating_ip_by_address(vm.userid, address,
                                                      for_update=True)
        nic, ipaddress = create_nic(vm, ipaddress=floating_ip)
        nics.append(nic)
267
268
269
270
    for network_id in private_networks:
        network = util.get_network(network_id, userid, non_deleted=True)
        if network.public:
            raise faults.Forbidden("Can not connect to public network")
271
        nic, ipaddress = create_nic(vm, network=network)
272
        nics.append(nic)
273
274
275
    for index, nic in enumerate(nics):
        nic.index = index
        nic.save()
276
277
278
    return nics


279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
def create_nic(vm, network=None, ipaddress=None, address=None):
    """Helper functions for create NIC objects.

    Create a NetworkInterface connecting a VirtualMachine to a network with the
    IPAddress specified. If no 'ipaddress' is passed and the network has an
    IPv4 subnet, then an IPv4 address will be automatically be allocated.

    """
    userid = vm.userid

    if ipaddress is None:
        if network.subnets.filter(ipversion=4).exists():
            try:
                ipaddress = util.allocate_ip(network, userid=userid,
                                             address=address)
            except pools.ValueNotAvailable:
                raise faults.badRequest("Address '%s' is not available." %
                                        address)

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

    if network is None:
        network = ipaddress.network
    elif network.state != 'ACTIVE':
        # TODO: What if is in settings ?
        raise faults.BuildInProgress('Network not active yet')

308
309
    #device_owner = "router" if vm.router else "vm"
    device_owner = "vm"
310
    nic = NetworkInterface.objects.create(machine=vm, network=network,
311
                                          state="BUILD",
Christos Stavrakakis's avatar
Christos Stavrakakis committed
312
                                          device_owner=device_owner)
313
314
315
316
317
318
319
    if ipaddress is not None:
        ipaddress.nic = nic
        ipaddress.save()

    return nic, ipaddress


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
@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:
        raise faults.BadRequest("Can not resize instance disk.")
    if old_flavor.disk_template != flavor.disk_template:
        raise faults.BadRequest("Can not change instance disk template.")

    log.info("Resizing VM from flavor '%s' to '%s", old_flavor, flavor)
    commission_info = {"cyclades.cpu": flavor.cpu - old_flavor.cpu,
364
                       "cyclades.ram": 1048576 * (flavor.ram - old_flavor.ram)}
365
366
367
    # Save serial to VM, since it is needed by server_command decorator
    vm.serial = quotas.issue_commission(user=vm.userid,
                                        source=quotas.DEFAULT_SOURCE,
368
369
                                        provisions=commission_info,
                                        name="resource: %s. resize" % vm)
370
371
372
373
    return backend.resize_instance(vm, vcpus=flavor.cpu, memory=flavor.ram)


@server_command("SET_FIREWALL_PROFILE")
374
375
def set_firewall_profile(vm, profile, nic):
    log.info("Setting VM %s, NIC %s, firewall %s", vm, nic, profile)
376
377
378

    if profile not in [x[0] for x in NetworkInterface.FIREWALL_PROFILES]:
        raise faults.BadRequest("Unsupported firewall profile")
379
    backend.set_firewall_profile(vm, profile=profile, nic=nic)
380
381
382
383
384
    return None


@server_command("CONNECT")
def connect(vm, network):
385
    nic, ipaddress = create_nic(vm, network)
386

387
    log.info("Creating NIC %s with IPAddress %s", nic, ipaddress)
388
389

    return backend.connect_to_network(vm, nic)
390
391
392


@server_command("DISCONNECT")
393
394
def disconnect(vm, nic):
    log.info("Removing NIC %s from VM %s", nic, vm)
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
    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
452
453


454
@server_command("CONNECT")
455
def add_floating_ip(vm, address):
456
457
458
459
460
461
    # Use for_update, to guarantee that floating IP will only by assigned once
    # and that it can not be released will it is being attached!
    floating_ip = util.get_floating_ip_by_address(vm.userid, address,
                                                  for_update=True)
    nic, floating_ip = create_nic(vm, ipaddress=floating_ip)
    log.info("Created NIC %s with floating IP %s", nic, floating_ip)
462
    return backend.connect_to_network(vm, nic)
463
464


465
@server_command("DISCONNECT")
466
467
def remove_floating_ip(vm, address):
    try:
468
469
470
        floating_ip = db_query.get_server_floating_ip(server=vm,
                                                      address=address,
                                                      for_update=True)
471
    except IPAddress.DoesNotExist:
472
473
        raise faults.BadRequest("Server '%s' has no floating ip with"
                                " address '%s'" % (vm, address))
474

475
    nic = floating_ip.nic
476
477
478
479
    log.info("Removing NIC %s from VM %s. Floating IP '%s'", str(nic.index),
             vm, floating_ip)

    return backend.disconnect_from_network(vm, nic)
480
481
482
483
484
485
486
487
488
489


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