config.py 49.2 KB
Newer Older
Iustin Pop's avatar
Iustin Pop committed
1
#
Iustin Pop's avatar
Iustin Pop committed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
#

# Copyright (C) 2006, 2007 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


"""Configuration management for Ganeti

24
This module provides the interface to the Ganeti cluster configuration.
Iustin Pop's avatar
Iustin Pop committed
25

26
27
The configuration data is stored on every node but is updated on the master
only. After each update, the master distributes the data to the other nodes.
Iustin Pop's avatar
Iustin Pop committed
28

29
30
Currently, the data storage format is JSON. YAML was slow and consuming too
much memory.
Iustin Pop's avatar
Iustin Pop committed
31
32
33
34
35

"""

import os
import random
36
import logging
37
import time
Iustin Pop's avatar
Iustin Pop committed
38
39

from ganeti import errors
40
from ganeti import locking
Iustin Pop's avatar
Iustin Pop committed
41
42
43
44
from ganeti import utils
from ganeti import constants
from ganeti import rpc
from ganeti import objects
45
from ganeti import serializer
Balazs Lecz's avatar
Balazs Lecz committed
46
from ganeti import uidpool
47
from ganeti import netutils
48
49


50
51
_config_lock = locking.SharedLock()

52
# job id used for resource management at config upgrade time
Michael Hanselmann's avatar
Michael Hanselmann committed
53
_UPGRADE_CONFIG_JID = "jid-cfg-upgrade"
54

55

Michael Hanselmann's avatar
Michael Hanselmann committed
56
def _ValidateConfig(data):
Iustin Pop's avatar
Iustin Pop committed
57
58
59
60
61
62
63
64
  """Verifies that a configuration objects looks valid.

  This only verifies the version of the configuration.

  @raise errors.ConfigurationError: if the version differs from what
      we expect

  """
Michael Hanselmann's avatar
Michael Hanselmann committed
65
  if data.version != constants.CONFIG_VERSION:
66
67
    raise errors.ConfigurationError("Cluster configuration version"
                                    " mismatch, got %s instead of %s" %
Michael Hanselmann's avatar
Michael Hanselmann committed
68
                                    (data.version,
69
                                     constants.CONFIG_VERSION))
Iustin Pop's avatar
Iustin Pop committed
70

71

Guido Trotter's avatar
Guido Trotter committed
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
class TemporaryReservationManager:
  """A temporary resource reservation manager.

  This is used to reserve resources in a job, before using them, making sure
  other jobs cannot get them in the meantime.

  """
  def __init__(self):
    self._ec_reserved = {}

  def Reserved(self, resource):
    for holder_reserved in self._ec_reserved.items():
      if resource in holder_reserved:
        return True
    return False

  def Reserve(self, ec_id, resource):
    if self.Reserved(resource):
      raise errors.ReservationError("Duplicate reservation for resource: %s." %
                                    (resource))
    if ec_id not in self._ec_reserved:
      self._ec_reserved[ec_id] = set([resource])
    else:
      self._ec_reserved[ec_id].add(resource)

  def DropECReservations(self, ec_id):
    if ec_id in self._ec_reserved:
      del self._ec_reserved[ec_id]

  def GetReserved(self):
    all_reserved = set()
    for holder_reserved in self._ec_reserved.values():
      all_reserved.update(holder_reserved)
    return all_reserved

  def Generate(self, existing, generate_one_fn, ec_id):
    """Generate a new resource of this type

    """
    assert callable(generate_one_fn)

    all_elems = self.GetReserved()
    all_elems.update(existing)
    retries = 64
    while retries > 0:
      new_resource = generate_one_fn()
      if new_resource is not None and new_resource not in all_elems:
        break
    else:
      raise errors.ConfigurationError("Not able generate new resource"
                                      " (last tried: %s)" % new_resource)
    self.Reserve(ec_id, new_resource)
    return new_resource


Iustin Pop's avatar
Iustin Pop committed
127
class ConfigWriter:
128
  """The interface to the cluster configuration.
Iustin Pop's avatar
Iustin Pop committed
129

130
131
132
  @ivar _temporary_lvs: reservation manager for temporary LVs
  @ivar _all_rms: a list of all temporary reservation managers

133
  """
Iustin Pop's avatar
Iustin Pop committed
134
  def __init__(self, cfg_file=None, offline=False):
135
    self.write_count = 0
136
    self._lock = _config_lock
Iustin Pop's avatar
Iustin Pop committed
137
138
139
140
141
142
    self._config_data = None
    self._offline = offline
    if cfg_file is None:
      self._cfg_file = constants.CLUSTER_CONF_FILE
    else:
      self._cfg_file = cfg_file
143
    self._temporary_ids = TemporaryReservationManager()
144
    self._temporary_drbds = {}
145
    self._temporary_macs = TemporaryReservationManager()
146
    self._temporary_secrets = TemporaryReservationManager()
147
148
149
    self._temporary_lvs = TemporaryReservationManager()
    self._all_rms = [self._temporary_ids, self._temporary_macs,
                     self._temporary_secrets, self._temporary_lvs]
150
151
152
153
    # Note: in order to prevent errors when resolving our name in
    # _DistributeConfig, we compute it here once and reuse it; it's
    # better to raise an error before starting to modify the config
    # file than after it was modified
154
    self._my_hostname = netutils.HostInfo().name
155
    self._last_cluster_serial = -1
Iustin Pop's avatar
Iustin Pop committed
156
    self._OpenConfig()
Iustin Pop's avatar
Iustin Pop committed
157
158
159
160
161
162
163
164
165

  # this method needs to be static, so that we can call it on the class
  @staticmethod
  def IsCluster():
    """Check if the cluster is configured.

    """
    return os.path.exists(constants.CLUSTER_CONF_FILE)

166
167
168
169
170
171
172
173
174
175
176
  def _GenerateOneMAC(self):
    """Generate one mac address

    """
    prefix = self._config_data.cluster.mac_prefix
    byte1 = random.randrange(0, 256)
    byte2 = random.randrange(0, 256)
    byte3 = random.randrange(0, 256)
    mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
    return mac

177
  @locking.ssynchronized(_config_lock, shared=1)
178
  def GenerateMAC(self, ec_id):
Iustin Pop's avatar
Iustin Pop committed
179
180
181
182
183
    """Generate a MAC for an instance.

    This should check the current instances for duplicates.

    """
184
185
    existing = self._AllMACs()
    return self._temporary_ids.Generate(existing, self._GenerateOneMAC, ec_id)
Iustin Pop's avatar
Iustin Pop committed
186

187
  @locking.ssynchronized(_config_lock, shared=1)
188
189
  def ReserveMAC(self, mac, ec_id):
    """Reserve a MAC for an instance.
190
191
192
193
194
195

    This only checks instances managed by this cluster, it does not
    check for potential collisions elsewhere.

    """
    all_macs = self._AllMACs()
196
197
198
199
    if mac in all_macs:
      raise errors.ReservationError("mac already in use")
    else:
      self._temporary_macs.Reserve(mac, ec_id)
200

201
202
203
204
205
206
207
208
209
210
211
212
213
214
  @locking.ssynchronized(_config_lock, shared=1)
  def ReserveLV(self, lv_name, ec_id):
    """Reserve an VG/LV pair for an instance.

    @type lv_name: string
    @param lv_name: the logical volume name to reserve

    """
    all_lvs = self._AllLVs()
    if lv_name in all_lvs:
      raise errors.ReservationError("LV already in use")
    else:
      self._temporary_lvs.Reserve(lv_name, ec_id)

215
  @locking.ssynchronized(_config_lock, shared=1)
216
  def GenerateDRBDSecret(self, ec_id):
217
218
219
220
221
    """Generate a DRBD secret.

    This checks the current disks for duplicates.

    """
222
223
224
    return self._temporary_secrets.Generate(self._AllDRBDSecrets(),
                                            utils.GenerateSecret,
                                            ec_id)
Michael Hanselmann's avatar
Michael Hanselmann committed
225

226
  def _AllLVs(self):
227
228
229
230
231
232
233
234
235
236
    """Compute the list of all LVs.

    """
    lvnames = set()
    for instance in self._config_data.instances.values():
      node_data = instance.MapLVsByNode()
      for lv_list in node_data.values():
        lvnames.update(lv_list)
    return lvnames

237
238
239
240
241
242
243
244
245
246
247
  def _AllIDs(self, include_temporary):
    """Compute the list of all UUIDs and names we have.

    @type include_temporary: boolean
    @param include_temporary: whether to include the _temporary_ids set
    @rtype: set
    @return: a set of IDs

    """
    existing = set()
    if include_temporary:
248
      existing.update(self._temporary_ids.GetReserved())
249
250
251
    existing.update(self._AllLVs())
    existing.update(self._config_data.instances.keys())
    existing.update(self._config_data.nodes.keys())
252
    existing.update([i.uuid for i in self._AllUUIDObjects() if i.uuid])
253
254
    return existing

255
  def _GenerateUniqueID(self, ec_id):
256
    """Generate an unique UUID.
257
258
259
260

    This checks the current node, instances and disk names for
    duplicates.

Iustin Pop's avatar
Iustin Pop committed
261
262
    @rtype: string
    @return: the unique id
263
264

    """
265
266
    existing = self._AllIDs(include_temporary=False)
    return self._temporary_ids.Generate(existing, utils.NewUUID, ec_id)
267

268
  @locking.ssynchronized(_config_lock, shared=1)
269
  def GenerateUniqueID(self, ec_id):
270
271
272
273
    """Generate an unique ID.

    This is just a wrapper over the unlocked version.

274
275
    @type ec_id: string
    @param ec_id: unique id for the job to reserve the id to
276
277

    """
278
    return self._GenerateUniqueID(ec_id)
279

Iustin Pop's avatar
Iustin Pop committed
280
281
282
  def _AllMACs(self):
    """Return all MACs present in the config.

Iustin Pop's avatar
Iustin Pop committed
283
284
285
    @rtype: list
    @return: the list of all MACs

Iustin Pop's avatar
Iustin Pop committed
286
287
288
289
290
291
292
293
    """
    result = []
    for instance in self._config_data.instances.values():
      for nic in instance.nics:
        result.append(nic.mac)

    return result

294
295
296
  def _AllDRBDSecrets(self):
    """Return all DRBD secrets present in the config.

Iustin Pop's avatar
Iustin Pop committed
297
298
299
    @rtype: list
    @return: the list of all DRBD secrets

300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
    """
    def helper(disk, result):
      """Recursively gather secrets from this disk."""
      if disk.dev_type == constants.DT_DRBD8:
        result.append(disk.logical_id[5])
      if disk.children:
        for child in disk.children:
          helper(child, result)

    result = []
    for instance in self._config_data.instances.values():
      for disk in instance.disks:
        helper(disk, result)

    return result

316
317
318
319
320
321
322
323
324
325
326
327
328
329
  def _CheckDiskIDs(self, disk, l_ids, p_ids):
    """Compute duplicate disk IDs

    @type disk: L{objects.Disk}
    @param disk: the disk at which to start searching
    @type l_ids: list
    @param l_ids: list of current logical ids
    @type p_ids: list
    @param p_ids: list of current physical ids
    @rtype: list
    @return: a list of error messages

    """
    result = []
330
331
332
333
334
335
336
337
338
339
    if disk.logical_id is not None:
      if disk.logical_id in l_ids:
        result.append("duplicate logical id %s" % str(disk.logical_id))
      else:
        l_ids.append(disk.logical_id)
    if disk.physical_id is not None:
      if disk.physical_id in p_ids:
        result.append("duplicate physical id %s" % str(disk.physical_id))
      else:
        p_ids.append(disk.physical_id)
340
341
342
343
344
345

    if disk.children:
      for child in disk.children:
        result.extend(self._CheckDiskIDs(child, l_ids, p_ids))
    return result

346
  def _UnlockedVerifyConfig(self):
347
348
    """Verify function.

349
350
351
352
    @rtype: list
    @return: a list of error messages; a non-empty list signifies
        configuration errors

Iustin Pop's avatar
Iustin Pop committed
353
354
355
    """
    result = []
    seen_macs = []
356
    ports = {}
Iustin Pop's avatar
Iustin Pop committed
357
    data = self._config_data
358
359
    seen_lids = []
    seen_pids = []
360
361
362
363
364
365
366
367

    # global cluster checks
    if not data.cluster.enabled_hypervisors:
      result.append("enabled hypervisors list doesn't have any entries")
    invalid_hvs = set(data.cluster.enabled_hypervisors) - constants.HYPER_TYPES
    if invalid_hvs:
      result.append("enabled hypervisors contains invalid entries: %s" %
                    invalid_hvs)
368
369
370
371
372
    missing_hvp = (set(data.cluster.enabled_hypervisors) -
                   set(data.cluster.hvparams.keys()))
    if missing_hvp:
      result.append("hypervisor parameters missing for the enabled"
                    " hypervisor(s) %s" % utils.CommaJoin(missing_hvp))
373
374
375
376
377
378

    if data.cluster.master_node not in data.nodes:
      result.append("cluster has invalid primary node '%s'" %
                    data.cluster.master_node)

    # per-instance checks
Iustin Pop's avatar
Iustin Pop committed
379
380
    for instance_name in data.instances:
      instance = data.instances[instance_name]
381
382
383
      if instance.name != instance_name:
        result.append("instance '%s' is indexed by wrong name '%s'" %
                      (instance.name, instance_name))
Iustin Pop's avatar
Iustin Pop committed
384
      if instance.primary_node not in data.nodes:
385
        result.append("instance '%s' has invalid primary node '%s'" %
Iustin Pop's avatar
Iustin Pop committed
386
387
388
                      (instance_name, instance.primary_node))
      for snode in instance.secondary_nodes:
        if snode not in data.nodes:
389
          result.append("instance '%s' has invalid secondary node '%s'" %
Iustin Pop's avatar
Iustin Pop committed
390
391
392
                        (instance_name, snode))
      for idx, nic in enumerate(instance.nics):
        if nic.mac in seen_macs:
393
          result.append("instance '%s' has NIC %d mac %s duplicate" %
Iustin Pop's avatar
Iustin Pop committed
394
395
396
                        (instance_name, idx, nic.mac))
        else:
          seen_macs.append(nic.mac)
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411

      # gather the drbd ports for duplicate checks
      for dsk in instance.disks:
        if dsk.dev_type in constants.LDS_DRBD:
          tcp_port = dsk.logical_id[2]
          if tcp_port not in ports:
            ports[tcp_port] = []
          ports[tcp_port].append((instance.name, "drbd disk %s" % dsk.iv_name))
      # gather network port reservation
      net_port = getattr(instance, "network_port", None)
      if net_port is not None:
        if net_port not in ports:
          ports[net_port] = []
        ports[net_port].append((instance.name, "network port"))

412
413
414
415
      # instance disk verify
      for idx, disk in enumerate(instance.disks):
        result.extend(["instance '%s' disk %d error: %s" %
                       (instance.name, idx, msg) for msg in disk.Verify()])
416
        result.extend(self._CheckDiskIDs(disk, seen_lids, seen_pids))
417

418
    # cluster-wide pool of free ports
419
    for free_port in data.cluster.tcpudp_port_pool:
420
421
422
423
424
425
426
427
428
429
      if free_port not in ports:
        ports[free_port] = []
      ports[free_port].append(("cluster", "port marked as free"))

    # compute tcp/udp duplicate ports
    keys = ports.keys()
    keys.sort()
    for pnum in keys:
      pdata = ports[pnum]
      if len(pdata) > 1:
430
        txt = utils.CommaJoin(["%s/%s" % val for val in pdata])
431
432
433
434
        result.append("tcp/udp port %s has duplicates: %s" % (pnum, txt))

    # highest used tcp port check
    if keys:
435
      if keys[-1] > data.cluster.highest_used_port:
436
        result.append("Highest used port mismatch, saved %s, computed %s" %
437
438
                      (data.cluster.highest_used_port, keys[-1]))

439
440
441
    if not data.nodes[data.cluster.master_node].master_candidate:
      result.append("Master node is not a master candidate")

442
    # master candidate checks
443
    mc_now, mc_max, _ = self._UnlockedGetMasterCandidateStats()
444
445
446
    if mc_now < mc_max:
      result.append("Not enough master candidates: actual %d, target %d" %
                    (mc_now, mc_max))
447

448
    # node checks
449
450
451
452
    for node_name, node in data.nodes.items():
      if node.name != node_name:
        result.append("Node '%s' is indexed by wrong name '%s'" %
                      (node.name, node_name))
453
454
455
456
457
458
      if [node.master_candidate, node.drained, node.offline].count(True) > 1:
        result.append("Node %s state is invalid: master_candidate=%s,"
                      " drain=%s, offline=%s" %
                      (node.name, node.master_candidate, node.drain,
                       node.offline))

459
    # drbd minors check
460
    _, duplicates = self._UnlockedComputeDRBDMap()
461
462
463
464
    for node, minor, instance_a, instance_b in duplicates:
      result.append("DRBD minor %d on node %s is assigned twice to instances"
                    " %s and %s" % (minor, node, instance_a, instance_b))

465
    # IP checks
466
467
468
469
470
471
472
    default_nicparams = data.cluster.nicparams[constants.PP_DEFAULT]
    ips = {}

    def _AddIpAddress(ip, name):
      ips.setdefault(ip, []).append(name)

    _AddIpAddress(data.cluster.master_ip, "cluster_ip")
473
474

    for node in data.nodes.values():
475
      _AddIpAddress(node.primary_ip, "node:%s/primary" % node.name)
476
      if node.secondary_ip != node.primary_ip:
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
        _AddIpAddress(node.secondary_ip, "node:%s/secondary" % node.name)

    for instance in data.instances.values():
      for idx, nic in enumerate(instance.nics):
        if nic.ip is None:
          continue

        nicparams = objects.FillDict(default_nicparams, nic.nicparams)
        nic_mode = nicparams[constants.NIC_MODE]
        nic_link = nicparams[constants.NIC_LINK]

        if nic_mode == constants.NIC_MODE_BRIDGED:
          link = "bridge:%s" % nic_link
        elif nic_mode == constants.NIC_MODE_ROUTED:
          link = "route:%s" % nic_link
        else:
          raise errors.ProgrammerError("NIC mode '%s' not handled" % nic_mode)

        _AddIpAddress("%s/%s" % (link, nic.ip),
                      "instance:%s/nic:%d" % (instance.name, idx))
497
498
499
500

    for ip, owners in ips.items():
      if len(owners) > 1:
        result.append("IP address %s is used by multiple owners: %s" %
501
                      (ip, utils.CommaJoin(owners)))
502

Iustin Pop's avatar
Iustin Pop committed
503
504
    return result

505
506
507
508
509
510
511
512
513
514
515
516
517
  @locking.ssynchronized(_config_lock, shared=1)
  def VerifyConfig(self):
    """Verify function.

    This is just a wrapper over L{_UnlockedVerifyConfig}.

    @rtype: list
    @return: a list of error messages; a non-empty list signifies
        configuration errors

    """
    return self._UnlockedVerifyConfig()

518
  def _UnlockedSetDiskID(self, disk, node_name):
Iustin Pop's avatar
Iustin Pop committed
519
520
521
522
523
524
525
526
    """Convert the unique ID to the ID needed on the target nodes.

    This is used only for drbd, which needs ip/port configuration.

    The routine descends down and updates its children also, because
    this helps when the only the top device is passed to the remote
    node.

527
528
    This function is for internal use, when the config lock is already held.

Iustin Pop's avatar
Iustin Pop committed
529
530
531
    """
    if disk.children:
      for child in disk.children:
532
        self._UnlockedSetDiskID(child, node_name)
Iustin Pop's avatar
Iustin Pop committed
533
534
535

    if disk.logical_id is None and disk.physical_id is not None:
      return
536
    if disk.dev_type == constants.LD_DRBD8:
537
      pnode, snode, port, pminor, sminor, secret = disk.logical_id
Iustin Pop's avatar
Iustin Pop committed
538
      if node_name not in (pnode, snode):
539
540
        raise errors.ConfigurationError("DRBD device not knowing node %s" %
                                        node_name)
541
542
      pnode_info = self._UnlockedGetNodeInfo(pnode)
      snode_info = self._UnlockedGetNodeInfo(snode)
Iustin Pop's avatar
Iustin Pop committed
543
544
545
      if pnode_info is None or snode_info is None:
        raise errors.ConfigurationError("Can't find primary or secondary node"
                                        " for %s" % str(disk))
546
547
      p_data = (pnode_info.secondary_ip, port)
      s_data = (snode_info.secondary_ip, port)
Iustin Pop's avatar
Iustin Pop committed
548
      if pnode == node_name:
549
        disk.physical_id = p_data + s_data + (pminor, secret)
Iustin Pop's avatar
Iustin Pop committed
550
      else: # it must be secondary, we tested above
551
        disk.physical_id = s_data + p_data + (sminor, secret)
Iustin Pop's avatar
Iustin Pop committed
552
553
554
555
    else:
      disk.physical_id = disk.logical_id
    return

556
557
558
559
560
561
562
563
564
565
566
567
568
569
  @locking.ssynchronized(_config_lock)
  def SetDiskID(self, disk, node_name):
    """Convert the unique ID to the ID needed on the target nodes.

    This is used only for drbd, which needs ip/port configuration.

    The routine descends down and updates its children also, because
    this helps when the only the top device is passed to the remote
    node.

    """
    return self._UnlockedSetDiskID(disk, node_name)

  @locking.ssynchronized(_config_lock)
570
571
572
573
  def AddTcpUdpPort(self, port):
    """Adds a new port to the available port pool.

    """
574
    if not isinstance(port, int):
575
      raise errors.ProgrammerError("Invalid type passed for port")
576

577
    self._config_data.cluster.tcpudp_port_pool.add(port)
578
579
    self._WriteConfig()

580
  @locking.ssynchronized(_config_lock, shared=1)
581
  def GetPortList(self):
582
583
584
    """Returns a copy of the current port list.

    """
585
    return self._config_data.cluster.tcpudp_port_pool.copy()
586

587
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
588
589
590
  def AllocatePort(self):
    """Allocate a port.

591
592
593
    The port will be taken from the available port pool or from the
    default port range (and in this case we increase
    highest_used_port).
Iustin Pop's avatar
Iustin Pop committed
594
595

    """
596
    # If there are TCP/IP ports configured, we use them first.
597
598
    if self._config_data.cluster.tcpudp_port_pool:
      port = self._config_data.cluster.tcpudp_port_pool.pop()
599
600
601
    else:
      port = self._config_data.cluster.highest_used_port + 1
      if port >= constants.LAST_DRBD_PORT:
602
603
604
        raise errors.ConfigurationError("The highest used port is greater"
                                        " than %s. Aborting." %
                                        constants.LAST_DRBD_PORT)
605
      self._config_data.cluster.highest_used_port = port
Iustin Pop's avatar
Iustin Pop committed
606
607
608
609

    self._WriteConfig()
    return port

610
  def _UnlockedComputeDRBDMap(self):
611
612
    """Compute the used DRBD minor/nodes.

613
    @rtype: (dict, list)
Iustin Pop's avatar
Iustin Pop committed
614
615
    @return: dictionary of node_name: dict of minor: instance_name;
        the returned dict will have all the nodes in it (even if with
616
617
618
        an empty list), and a list of duplicates; if the duplicates
        list is not empty, the configuration is corrupted and its caller
        should raise an exception
619
620
621

    """
    def _AppendUsedPorts(instance_name, disk, used):
622
      duplicates = []
623
      if disk.dev_type == constants.LD_DRBD8 and len(disk.logical_id) >= 5:
Michael Hanselmann's avatar
Michael Hanselmann committed
624
625
        node_a, node_b, _, minor_a, minor_b = disk.logical_id[:5]
        for node, port in ((node_a, minor_a), (node_b, minor_b)):
626
627
          assert node in used, ("Node '%s' of instance '%s' not found"
                                " in node list" % (node, instance_name))
628
          if port in used[node]:
629
630
631
            duplicates.append((node, port, instance_name, used[node][port]))
          else:
            used[node][port] = instance_name
632
633
      if disk.children:
        for child in disk.children:
634
635
          duplicates.extend(_AppendUsedPorts(instance_name, child, used))
      return duplicates
636

637
    duplicates = []
638
    my_dict = dict((node, {}) for node in self._config_data.nodes)
639
640
641
    for instance in self._config_data.instances.itervalues():
      for disk in instance.disks:
        duplicates.extend(_AppendUsedPorts(instance.name, disk, my_dict))
642
    for (node, minor), instance in self._temporary_drbds.iteritems():
643
      if minor in my_dict[node] and my_dict[node][minor] != instance:
644
645
646
647
        duplicates.append((node, minor, instance, my_dict[node][minor]))
      else:
        my_dict[node][minor] = instance
    return my_dict, duplicates
648

649
650
651
652
653
654
655
656
657
658
659
  @locking.ssynchronized(_config_lock)
  def ComputeDRBDMap(self):
    """Compute the used DRBD minor/nodes.

    This is just a wrapper over L{_UnlockedComputeDRBDMap}.

    @return: dictionary of node_name: dict of minor: instance_name;
        the returned dict will have all the nodes in it (even if with
        an empty list).

    """
660
661
662
663
664
    d_map, duplicates = self._UnlockedComputeDRBDMap()
    if duplicates:
      raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
                                      str(duplicates))
    return d_map
665

666
667
668
669
670
671
672
673
674
  @locking.ssynchronized(_config_lock)
  def AllocateDRBDMinor(self, nodes, instance):
    """Allocate a drbd minor.

    The free minor will be automatically computed from the existing
    devices. A node can be given multiple times in order to allocate
    multiple minors. The result is the list of minors, in the same
    order as the passed nodes.

675
676
677
    @type instance: string
    @param instance: the instance for which we allocate minors

678
    """
679
    assert isinstance(instance, basestring), \
680
           "Invalid argument '%s' passed to AllocateDRBDMinor" % instance
681

682
683
684
685
    d_map, duplicates = self._UnlockedComputeDRBDMap()
    if duplicates:
      raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
                                      str(duplicates))
686
687
688
689
690
691
692
    result = []
    for nname in nodes:
      ndata = d_map[nname]
      if not ndata:
        # no minors used, we can start at 0
        result.append(0)
        ndata[0] = instance
693
        self._temporary_drbds[(nname, 0)] = instance
694
695
696
697
698
699
700
701
702
703
        continue
      keys = ndata.keys()
      keys.sort()
      ffree = utils.FirstFree(keys)
      if ffree is None:
        # return the next minor
        # TODO: implement high-limit check
        minor = keys[-1] + 1
      else:
        minor = ffree
704
705
706
707
708
      # double-check minor against current instances
      assert minor not in d_map[nname], \
             ("Attempt to reuse allocated DRBD minor %d on node %s,"
              " already allocated to instance %s" %
              (minor, nname, d_map[nname][minor]))
709
      ndata[minor] = instance
710
711
712
713
714
715
716
717
      # double-check minor against reservation
      r_key = (nname, minor)
      assert r_key not in self._temporary_drbds, \
             ("Attempt to reuse reserved DRBD minor %d on node %s,"
              " reserved for instance %s" %
              (minor, nname, self._temporary_drbds[r_key]))
      self._temporary_drbds[r_key] = instance
      result.append(minor)
718
719
720
721
    logging.debug("Request to allocate drbd minors, input: %s, returning %s",
                  nodes, result)
    return result

722
  def _UnlockedReleaseDRBDMinors(self, instance):
723
724
725
726
727
728
729
    """Release temporary drbd minors allocated for a given instance.

    @type instance: string
    @param instance: the instance for which temporary minors should be
                     released

    """
730
731
    assert isinstance(instance, basestring), \
           "Invalid argument passed to ReleaseDRBDMinors"
732
733
734
735
    for key, name in self._temporary_drbds.items():
      if name == instance:
        del self._temporary_drbds[key]

736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
  @locking.ssynchronized(_config_lock)
  def ReleaseDRBDMinors(self, instance):
    """Release temporary drbd minors allocated for a given instance.

    This should be called on the error paths, on the success paths
    it's automatically called by the ConfigWriter add and update
    functions.

    This function is just a wrapper over L{_UnlockedReleaseDRBDMinors}.

    @type instance: string
    @param instance: the instance for which temporary minors should be
                     released

    """
    self._UnlockedReleaseDRBDMinors(instance)

753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
  @locking.ssynchronized(_config_lock, shared=1)
  def GetConfigVersion(self):
    """Get the configuration version.

    @return: Config version

    """
    return self._config_data.version

  @locking.ssynchronized(_config_lock, shared=1)
  def GetClusterName(self):
    """Get cluster name.

    @return: Cluster name

    """
    return self._config_data.cluster.cluster_name

  @locking.ssynchronized(_config_lock, shared=1)
  def GetMasterNode(self):
    """Get the hostname of the master node for this cluster.

    @return: Master hostname

    """
    return self._config_data.cluster.master_node

  @locking.ssynchronized(_config_lock, shared=1)
  def GetMasterIP(self):
    """Get the IP of the master node for this cluster.

    @return: Master IP

    """
    return self._config_data.cluster.master_ip

  @locking.ssynchronized(_config_lock, shared=1)
  def GetMasterNetdev(self):
    """Get the master network device for this cluster.

    """
    return self._config_data.cluster.master_netdev

  @locking.ssynchronized(_config_lock, shared=1)
  def GetFileStorageDir(self):
    """Get the file storage dir for this cluster.

    """
    return self._config_data.cluster.file_storage_dir

  @locking.ssynchronized(_config_lock, shared=1)
  def GetHypervisorType(self):
    """Get the hypervisor type for this cluster.

    """
808
    return self._config_data.cluster.enabled_hypervisors[0]
809

810
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
811
812
813
  def GetHostKey(self):
    """Return the rsa hostkey from the config.

Iustin Pop's avatar
Iustin Pop committed
814
815
    @rtype: string
    @return: the rsa hostkey
Iustin Pop's avatar
Iustin Pop committed
816
817
818
819

    """
    return self._config_data.cluster.rsahostkeypub

820
821
822
823
824
825
826
  @locking.ssynchronized(_config_lock, shared=1)
  def GetDefaultIAllocator(self):
    """Get the default instance allocator for this cluster.

    """
    return self._config_data.cluster.default_iallocator

827
  @locking.ssynchronized(_config_lock)
828
  def AddInstance(self, instance, ec_id):
Iustin Pop's avatar
Iustin Pop committed
829
830
831
832
    """Add an instance to the config.

    This should be used after creating a new instance.

Iustin Pop's avatar
Iustin Pop committed
833
834
835
    @type instance: L{objects.Instance}
    @param instance: the instance object

Iustin Pop's avatar
Iustin Pop committed
836
837
838
839
    """
    if not isinstance(instance, objects.Instance):
      raise errors.ProgrammerError("Invalid type passed to AddInstance")

840
841
    if instance.disk_template != constants.DT_DISKLESS:
      all_lvs = instance.MapLVsByNode()
Iustin Pop's avatar
Iustin Pop committed
842
      logging.info("Instance '%s' DISK_LAYOUT: %s", instance.name, all_lvs)
843

844
845
846
847
    all_macs = self._AllMACs()
    for nic in instance.nics:
      if nic.mac in all_macs:
        raise errors.ConfigurationError("Cannot add instance %s:"
848
849
850
                                        " MAC address '%s' already in use." %
                                        (instance.name, nic.mac))

851
    self._EnsureUUID(instance, ec_id)
852

853
    instance.serial_no = 1
854
    instance.ctime = instance.mtime = time.time()
Iustin Pop's avatar
Iustin Pop committed
855
    self._config_data.instances[instance.name] = instance
856
    self._config_data.cluster.serial_no += 1
857
    self._UnlockedReleaseDRBDMinors(instance.name)
Iustin Pop's avatar
Iustin Pop committed
858
859
    self._WriteConfig()

860
  def _EnsureUUID(self, item, ec_id):
861
862
863
    """Ensures a given object has a valid UUID.

    @param item: the instance or node to be checked
864
    @param ec_id: the execution context id for the uuid reservation
865
866
867

    """
    if not item.uuid:
868
      item.uuid = self._GenerateUniqueID(ec_id)
869
870
871
    elif item.uuid in self._AllIDs(include_temporary=True):
      raise errors.ConfigurationError("Cannot add '%s': UUID %s already"
                                      " in use" % (item.name, item.uuid))
872

873
874
  def _SetInstanceStatus(self, instance_name, status):
    """Set the instance's status to a given value.
Iustin Pop's avatar
Iustin Pop committed
875
876

    """
877
878
    assert isinstance(status, bool), \
           "Invalid status '%s' passed to SetInstanceStatus" % (status,)
Iustin Pop's avatar
Iustin Pop committed
879
880

    if instance_name not in self._config_data.instances:
881
882
      raise errors.ConfigurationError("Unknown instance '%s'" %
                                      instance_name)
Iustin Pop's avatar
Iustin Pop committed
883
    instance = self._config_data.instances[instance_name]
884
885
    if instance.admin_up != status:
      instance.admin_up = status
886
      instance.serial_no += 1
887
      instance.mtime = time.time()
888
      self._WriteConfig()
Iustin Pop's avatar
Iustin Pop committed
889

890
  @locking.ssynchronized(_config_lock)
891
892
893
894
  def MarkInstanceUp(self, instance_name):
    """Mark the instance status to up in the config.

    """
895
    self._SetInstanceStatus(instance_name, True)
896

897
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
898
899
900
901
902
  def RemoveInstance(self, instance_name):
    """Remove the instance from the configuration.

    """
    if instance_name not in self._config_data.instances:
903
      raise errors.ConfigurationError("Unknown instance '%s'" % instance_name)
Iustin Pop's avatar
Iustin Pop committed
904
    del self._config_data.instances[instance_name]
905
    self._config_data.cluster.serial_no += 1
Iustin Pop's avatar
Iustin Pop committed
906
907
    self._WriteConfig()

908
  @locking.ssynchronized(_config_lock)
909
910
911
912
913
914
915
916
917
918
919
920
921
  def RenameInstance(self, old_name, new_name):
    """Rename an instance.

    This needs to be done in ConfigWriter and not by RemoveInstance
    combined with AddInstance as only we can guarantee an atomic
    rename.

    """
    if old_name not in self._config_data.instances:
      raise errors.ConfigurationError("Unknown instance '%s'" % old_name)
    inst = self._config_data.instances[old_name]
    del self._config_data.instances[old_name]
    inst.name = new_name
922
923
924
925
926
927

    for disk in inst.disks:
      if disk.dev_type == constants.LD_FILE:
        # rename the file paths in logical and physical id
        file_storage_dir = os.path.dirname(os.path.dirname(disk.logical_id[1]))
        disk.physical_id = disk.logical_id = (disk.logical_id[0],
928
929
930
                                              utils.PathJoin(file_storage_dir,
                                                             inst.name,
                                                             disk.iv_name))
931

932
933
934
    self._config_data.instances[inst.name] = inst
    self._WriteConfig()

935
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
936
937
938
939
  def MarkInstanceDown(self, instance_name):
    """Mark the status of an instance to down in the configuration.

    """
940
    self._SetInstanceStatus(instance_name, False)
Iustin Pop's avatar
Iustin Pop committed
941

942
943
944
945
946
947
948
949
  def _UnlockedGetInstanceList(self):
    """Get the list of instances.

    This function is for internal use, when the config lock is already held.

    """
    return self._config_data.instances.keys()

950
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
951
952
953
  def GetInstanceList(self):
    """Get the list of instances.

Iustin Pop's avatar
Iustin Pop committed
954
955
    @return: array of instances, ex. ['instance2.example.com',
        'instance1.example.com']
Iustin Pop's avatar
Iustin Pop committed
956
957

    """
958
    return self._UnlockedGetInstanceList()
Iustin Pop's avatar
Iustin Pop committed
959

960
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
961
962
963
964
965
  def ExpandInstanceName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    return utils.MatchNameComponent(short_name,
966
967
                                    self._config_data.instances.keys(),
                                    case_sensitive=False)
Iustin Pop's avatar
Iustin Pop committed
968

969
  def _UnlockedGetInstanceInfo(self, instance_name):
Michael Hanselmann's avatar
Michael Hanselmann committed
970
    """Returns information about an instance.
971
972
973
974
975
976
977
978
979

    This function is for internal use, when the config lock is already held.

    """
    if instance_name not in self._config_data.instances:
      return None

    return self._config_data.instances[instance_name]

980
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
981
  def GetInstanceInfo(self, instance_name):
Michael Hanselmann's avatar
Michael Hanselmann committed
982
    """Returns information about an instance.
Iustin Pop's avatar
Iustin Pop committed
983

Michael Hanselmann's avatar
Michael Hanselmann committed
984
    It takes the information from the configuration file. Other information of
Iustin Pop's avatar
Iustin Pop committed
985
986
    an instance are taken from the live systems.

Iustin Pop's avatar
Iustin Pop committed
987
988
    @param instance_name: name of the instance, e.g.
        I{instance1.example.com}
Iustin Pop's avatar
Iustin Pop committed
989

Iustin Pop's avatar
Iustin Pop committed
990
991
    @rtype: L{objects.Instance}
    @return: the instance object
Iustin Pop's avatar
Iustin Pop committed
992
993

    """
994
    return self._UnlockedGetInstanceInfo(instance_name)
Iustin Pop's avatar
Iustin Pop committed
995

996
997
998
999
1000
  @locking.ssynchronized(_config_lock, shared=1)
  def GetAllInstancesInfo(self):
    """Get the configuration of all instances.

    @rtype: dict
Iustin Pop's avatar
Iustin Pop committed
1001
    @return: dict of (instance, instance_info), where instance_info is what
1002
1003
1004
              would GetInstanceInfo return for the node

    """
1005
1006
    my_dict = dict([(instance, self._UnlockedGetInstanceInfo(instance))
                    for instance in self._UnlockedGetInstanceList()])
1007
1008
    return my_dict

1009
  @locking.ssynchronized(_config_lock)
1010
  def AddNode(self, node, ec_id):
Iustin Pop's avatar
Iustin Pop committed
1011
1012
    """Add a node to the configuration.

Iustin Pop's avatar
Iustin Pop committed
1013
1014
    @type node: L{objects.Node}
    @param node: a Node instance
Iustin Pop's avatar
Iustin Pop committed
1015
1016

    """
1017
    logging.info("Adding node %s to configuration", node.name)
1018

1019
    self._EnsureUUID(node, ec_id)
1020

1021
    node.serial_no = 1
1022
    node.ctime = node.mtime = time.time()
Iustin Pop's avatar
Iustin Pop committed
1023
    self._config_data.nodes[node.name] = node
1024
    self._config_data.cluster.serial_no += 1
Iustin Pop's avatar
Iustin Pop committed
1025
1026
    self._WriteConfig()

1027
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
1028
1029
1030
1031
  def RemoveNode(self, node_name):
    """Remove a node from the configuration.

    """
1032
    logging.info("Removing node %s from configuration", node_name)
1033

Iustin Pop's avatar
Iustin Pop committed
1034
    if node_name not in self._config_data.nodes:
1035
      raise errors.ConfigurationError("Unknown node '%s'" % node_name)
Iustin Pop's avatar
Iustin Pop committed
1036
1037

    del self._config_data.nodes[node_name]
1038
    self._config_data.cluster.serial_no += 1
Iustin Pop's avatar
Iustin Pop committed
1039
1040
    self._WriteConfig()

1041
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
1042
1043
1044
1045
1046
  def ExpandNodeName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    return utils.MatchNameComponent(short_name,
1047
1048
                                    self._config_data.nodes.keys(),
                                    case_sensitive=False)
Iustin Pop's avatar
Iustin Pop committed
1049

1050
  def _UnlockedGetNodeInfo(self, node_name):
Iustin Pop's avatar
Iustin Pop committed
1051
1052
    """Get the configuration of a node, as stored in the config.

Iustin Pop's avatar
Iustin Pop committed
1053
1054
    This function is for internal use, when the config lock is already
    held.
1055

Iustin Pop's avatar
Iustin Pop committed
1056
    @param node_name: the node name, e.g. I{node1.example.com}
Iustin Pop's avatar
Iustin Pop committed
1057

Iustin Pop's avatar
Iustin Pop committed
1058
1059
    @rtype: L{objects.Node}
    @return: the node object
Iustin Pop's avatar
Iustin Pop committed
1060
1061
1062
1063
1064
1065
1066

    """
    if node_name not in self._config_data.nodes:
      return None

    return self._config_data.nodes[node_name]

1067
1068
1069
1070
  @locking.ssynchronized(_config_lock, shared=1)
  def GetNodeInfo(self, node_name):
    """Get the configuration of a node, as stored in the config.

Iustin Pop's avatar
Iustin Pop committed
1071
    This is just a locked wrapper over L{_UnlockedGetNodeInfo}.
1072

Iustin Pop's avatar
Iustin Pop committed
1073
1074
1075
1076
    @param node_name: the node name, e.g. I{node1.example.com}

    @rtype: L{objects.Node}
    @return: the node object
1077
1078
1079
1080
1081

    """
    return self._UnlockedGetNodeInfo(node_name)

  def _UnlockedGetNodeList(self):
Iustin Pop's avatar
Iustin Pop committed
1082
1083
    """Return the list of nodes which are in the configuration.

Iustin Pop's avatar
Iustin Pop committed
1084
1085
1086
1087
    This function is for internal use, when the config lock is already
    held.

    @rtype: list
1088

Iustin Pop's avatar
Iustin Pop committed
1089
1090
1091
    """
    return self._config_data.nodes.keys()

1092
1093
1094
1095
1096
1097
1098
  @locking.ssynchronized(_config_lock, shared=1)
  def GetNodeList(self):
    """Return the list of nodes which are in the configuration.

    """
    return self._UnlockedGetNodeList()

1099
  def _UnlockedGetOnlineNodeList(self):
Iustin Pop's avatar
Iustin Pop committed
1100
1101
1102
1103
1104
1105
1106
    """Return the list of nodes which are online.

    """
    all_nodes = [self._UnlockedGetNodeInfo(node)
                 for node in self._UnlockedGetNodeList()]
    return [node.name for node in all_nodes if not node.offline]

1107
1108
1109
1110
1111
1112
1113
  @locking.ssynchronized(_config_lock, shared=1)
  def GetOnlineNodeList(self):
    """Return the list of nodes which are online.

    """
    return self._UnlockedGetOnlineNodeList()

1114
1115
1116
1117
1118
  @locking.ssynchronized(_config_lock, shared=1)
  def GetAllNodesInfo(self):
    """Get the configuration of all nodes.

    @rtype: dict
1119
    @return: dict of (node, node_info), where node_info is what
1120
1121
1122
1123
1124
1125
1126
              would GetNodeInfo return for the node

    """
    my_dict = dict([(node, self._UnlockedGetNodeInfo(node))
                    for node in self._UnlockedGetNodeList()])
    return my_dict

1127
  def _UnlockedGetMasterCandidateStats(self, exceptions=None):
1128
1129
    """Get the number of current and maximum desired and possible candidates.

1130
1131
    @type exceptions: list
    @param exceptions: if passed, list of nodes that should be ignored
1132
    @rtype: tuple
1133
    @return: tuple of (current, desired and possible, possible)
1134
1135

    """
1136
    mc_now = mc_should = mc_max = 0
1137
1138
1139
    for node in self._config_data.nodes.values():
      if exceptions and node.name in exceptions:
        continue
1140
      if not (node.offline or node.drained):
1141
1142
1143
        mc_max += 1
      if node.master_candidate:
        mc_now += 1
1144
1145
    mc_should = min(mc_max, self._config_data.cluster.candidate_pool_size)
    return (mc_now, mc_should, mc_max)
1146
1147

  @locking.ssynchronized(_config_lock, shared=1)
1148
  def GetMasterCandidateStats(self, exceptions=None):
1149
1150
1151
1152
    """Get the number of current and maximum possible candidates.

    This is just a wrapper over L{_UnlockedGetMasterCandidateStats}.

1153
1154
    @type exceptions: list
    @param exceptions: if passed, list of nodes that should be ignored
1155
1156
1157
1158
    @rtype: tuple
    @return: tuple of (current, max)

    """
1159
    return self._UnlockedGetMasterCandidateStats(exceptions)
1160
1161

  @locking.ssynchronized(_config_lock)
Guido Trotter's avatar
Guido Trotter committed
1162
  def MaintainCandidatePool(self, exceptions):
1163
1164
    """Try to grow the candidate pool to the desired size.

Guido Trotter's avatar
Guido Trotter committed
1165
1166
    @type exceptions: list
    @param exceptions: if passed, list of nodes that