config.py 56.4 KB
Newer Older
Iustin Pop's avatar
Iustin Pop committed
1
#
Iustin Pop's avatar
Iustin Pop committed
2
3
#

4
# Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc.
Iustin Pop's avatar
Iustin Pop committed
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
#
# 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
36
# pylint: disable-msg=R0904
# R0904: Too many public methods

Iustin Pop's avatar
Iustin Pop committed
37
38
import os
import random
39
import logging
40
import time
Iustin Pop's avatar
Iustin Pop committed
41
42

from ganeti import errors
43
from ganeti import locking
Iustin Pop's avatar
Iustin Pop committed
44
45
46
47
from ganeti import utils
from ganeti import constants
from ganeti import rpc
from ganeti import objects
48
from ganeti import serializer
Balazs Lecz's avatar
Balazs Lecz committed
49
from ganeti import uidpool
50
from ganeti import netutils
51
from ganeti import runtime
52
53


54
_config_lock = locking.SharedLock("ConfigWriter")
55

56
# job id used for resource management at config upgrade time
Michael Hanselmann's avatar
Michael Hanselmann committed
57
_UPGRADE_CONFIG_JID = "jid-cfg-upgrade"
58

59

Michael Hanselmann's avatar
Michael Hanselmann committed
60
def _ValidateConfig(data):
Iustin Pop's avatar
Iustin Pop committed
61
62
63
64
65
66
67
68
  """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
69
  if data.version != constants.CONFIG_VERSION:
70
    raise errors.ConfigVersionMismatch(constants.CONFIG_VERSION, data.version)
Iustin Pop's avatar
Iustin Pop committed
71

72

Guido Trotter's avatar
Guido Trotter committed
73
74
75
76
77
78
79
80
81
82
83
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):
84
    for holder_reserved in self._ec_reserved.values():
Guido Trotter's avatar
Guido Trotter committed
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
127
      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
128
class ConfigWriter:
129
  """The interface to the cluster configuration.
Iustin Pop's avatar
Iustin Pop committed
130

131
132
133
  @ivar _temporary_lvs: reservation manager for temporary LVs
  @ivar _all_rms: a list of all temporary reservation managers

134
  """
135
136
  def __init__(self, cfg_file=None, offline=False, _getents=runtime.GetEnts,
               accept_foreign=False):
137
    self.write_count = 0
138
    self._lock = _config_lock
Iustin Pop's avatar
Iustin Pop committed
139
140
141
142
143
144
    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
145
    self._getents = _getents
146
    self._temporary_ids = TemporaryReservationManager()
147
    self._temporary_drbds = {}
148
    self._temporary_macs = TemporaryReservationManager()
149
    self._temporary_secrets = TemporaryReservationManager()
150
151
152
    self._temporary_lvs = TemporaryReservationManager()
    self._all_rms = [self._temporary_ids, self._temporary_macs,
                     self._temporary_secrets, self._temporary_lvs]
153
154
155
156
    # 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
157
    self._my_hostname = netutils.Hostname.GetSysName()
158
    self._last_cluster_serial = -1
159
    self._cfg_id = None
160
    self._OpenConfig(accept_foreign)
Iustin Pop's avatar
Iustin Pop committed
161
162
163
164
165
166
167
168
169

  # 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)

170
171
172
173
174
175
176
177
178
179
180
  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

181
  @locking.ssynchronized(_config_lock, shared=1)
182
  def GenerateMAC(self, ec_id):
Iustin Pop's avatar
Iustin Pop committed
183
184
185
186
187
    """Generate a MAC for an instance.

    This should check the current instances for duplicates.

    """
188
189
    existing = self._AllMACs()
    return self._temporary_ids.Generate(existing, self._GenerateOneMAC, ec_id)
Iustin Pop's avatar
Iustin Pop committed
190

191
  @locking.ssynchronized(_config_lock, shared=1)
192
193
  def ReserveMAC(self, mac, ec_id):
    """Reserve a MAC for an instance.
194
195
196
197
198
199

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

    """
    all_macs = self._AllMACs()
200
201
202
203
    if mac in all_macs:
      raise errors.ReservationError("mac already in use")
    else:
      self._temporary_macs.Reserve(mac, ec_id)
204

205
206
207
208
209
210
211
212
213
214
215
216
217
218
  @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)

219
  @locking.ssynchronized(_config_lock, shared=1)
220
  def GenerateDRBDSecret(self, ec_id):
221
222
223
224
225
    """Generate a DRBD secret.

    This checks the current disks for duplicates.

    """
226
227
228
    return self._temporary_secrets.Generate(self._AllDRBDSecrets(),
                                            utils.GenerateSecret,
                                            ec_id)
Michael Hanselmann's avatar
Michael Hanselmann committed
229

230
  def _AllLVs(self):
231
232
233
234
235
236
237
238
239
240
    """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

241
242
243
244
245
246
247
248
249
250
251
  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:
252
      existing.update(self._temporary_ids.GetReserved())
253
254
255
    existing.update(self._AllLVs())
    existing.update(self._config_data.instances.keys())
    existing.update(self._config_data.nodes.keys())
256
    existing.update([i.uuid for i in self._AllUUIDObjects() if i.uuid])
257
258
    return existing

259
  def _GenerateUniqueID(self, ec_id):
260
    """Generate an unique UUID.
261
262
263
264

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

Iustin Pop's avatar
Iustin Pop committed
265
266
    @rtype: string
    @return: the unique id
267
268

    """
269
270
    existing = self._AllIDs(include_temporary=False)
    return self._temporary_ids.Generate(existing, utils.NewUUID, ec_id)
271

272
  @locking.ssynchronized(_config_lock, shared=1)
273
  def GenerateUniqueID(self, ec_id):
274
275
276
277
    """Generate an unique ID.

    This is just a wrapper over the unlocked version.

278
279
    @type ec_id: string
    @param ec_id: unique id for the job to reserve the id to
280
281

    """
282
    return self._GenerateUniqueID(ec_id)
283

Iustin Pop's avatar
Iustin Pop committed
284
285
286
  def _AllMACs(self):
    """Return all MACs present in the config.

Iustin Pop's avatar
Iustin Pop committed
287
288
289
    @rtype: list
    @return: the list of all MACs

Iustin Pop's avatar
Iustin Pop committed
290
291
292
293
294
295
296
297
    """
    result = []
    for instance in self._config_data.instances.values():
      for nic in instance.nics:
        result.append(nic.mac)

    return result

298
299
300
  def _AllDRBDSecrets(self):
    """Return all DRBD secrets present in the config.

Iustin Pop's avatar
Iustin Pop committed
301
302
303
    @rtype: list
    @return: the list of all DRBD secrets

304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
    """
    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

320
321
322
323
324
325
326
327
328
329
330
331
332
333
  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 = []
334
335
336
337
338
339
340
341
342
343
    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)
344
345
346
347
348
349

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

350
  def _UnlockedVerifyConfig(self):
351
352
    """Verify function.

353
354
355
356
    @rtype: list
    @return: a list of error messages; a non-empty list signifies
        configuration errors

Iustin Pop's avatar
Iustin Pop committed
357
358
359
    """
    result = []
    seen_macs = []
360
    ports = {}
Iustin Pop's avatar
Iustin Pop committed
361
    data = self._config_data
362
363
    seen_lids = []
    seen_pids = []
364
365
366
367
368
369
370
371

    # 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)
372
373
374
375
376
    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))
377
378
379
380
381
382

    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
383
384
    for instance_name in data.instances:
      instance = data.instances[instance_name]
385
386
387
      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
388
      if instance.primary_node not in data.nodes:
389
        result.append("instance '%s' has invalid primary node '%s'" %
Iustin Pop's avatar
Iustin Pop committed
390
391
392
                      (instance_name, instance.primary_node))
      for snode in instance.secondary_nodes:
        if snode not in data.nodes:
393
          result.append("instance '%s' has invalid secondary node '%s'" %
Iustin Pop's avatar
Iustin Pop committed
394
395
396
                        (instance_name, snode))
      for idx, nic in enumerate(instance.nics):
        if nic.mac in seen_macs:
397
          result.append("instance '%s' has NIC %d mac %s duplicate" %
Iustin Pop's avatar
Iustin Pop committed
398
399
400
                        (instance_name, idx, nic.mac))
        else:
          seen_macs.append(nic.mac)
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415

      # 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"))

416
417
418
419
      # 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()])
420
        result.extend(self._CheckDiskIDs(disk, seen_lids, seen_pids))
421

422
    # cluster-wide pool of free ports
423
    for free_port in data.cluster.tcpudp_port_pool:
424
425
426
427
428
429
430
431
432
433
      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:
434
        txt = utils.CommaJoin(["%s/%s" % val for val in pdata])
435
436
437
438
        result.append("tcp/udp port %s has duplicates: %s" % (pnum, txt))

    # highest used tcp port check
    if keys:
439
      if keys[-1] > data.cluster.highest_used_port:
440
        result.append("Highest used port mismatch, saved %s, computed %s" %
441
442
                      (data.cluster.highest_used_port, keys[-1]))

443
444
445
    if not data.nodes[data.cluster.master_node].master_candidate:
      result.append("Master node is not a master candidate")

446
    # master candidate checks
447
    mc_now, mc_max, _ = self._UnlockedGetMasterCandidateStats()
448
449
450
    if mc_now < mc_max:
      result.append("Not enough master candidates: actual %d, target %d" %
                    (mc_now, mc_max))
451

452
    # node checks
453
454
455
456
    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))
457
458
459
      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" %
460
                      (node.name, node.master_candidate, node.drained,
461
462
                       node.offline))

463
    # nodegroups checks
464
    nodegroups_names = set()
465
466
467
468
469
    for nodegroup_uuid in data.nodegroups:
      nodegroup = data.nodegroups[nodegroup_uuid]
      if nodegroup.uuid != nodegroup_uuid:
        result.append("nodegroup '%s' (uuid: '%s') indexed by wrong uuid '%s'"
                      % (nodegroup.name, nodegroup.uuid, nodegroup_uuid))
470
471
472
      if utils.UUID_RE.match(nodegroup.name.lower()):
        result.append("nodegroup '%s' (uuid: '%s') has uuid-like name" %
                      (nodegroup.name, nodegroup.uuid))
473
474
475
476
      if nodegroup.name in nodegroups_names:
        result.append("duplicate nodegroup name '%s'" % nodegroup.name)
      else:
        nodegroups_names.add(nodegroup.name)
477

478
    # drbd minors check
479
    _, duplicates = self._UnlockedComputeDRBDMap()
480
481
482
483
    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))

484
    # IP checks
485
486
487
488
489
490
491
    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")
492
493

    for node in data.nodes.values():
494
      _AddIpAddress(node.primary_ip, "node:%s/primary" % node.name)
495
      if node.secondary_ip != node.primary_ip:
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
        _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))
516
517
518
519

    for ip, owners in ips.items():
      if len(owners) > 1:
        result.append("IP address %s is used by multiple owners: %s" %
520
                      (ip, utils.CommaJoin(owners)))
521

Iustin Pop's avatar
Iustin Pop committed
522
523
    return result

524
525
526
527
528
529
530
531
532
533
534
535
536
  @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()

537
  def _UnlockedSetDiskID(self, disk, node_name):
Iustin Pop's avatar
Iustin Pop committed
538
539
540
541
542
543
544
545
    """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.

546
547
    This function is for internal use, when the config lock is already held.

Iustin Pop's avatar
Iustin Pop committed
548
549
550
    """
    if disk.children:
      for child in disk.children:
551
        self._UnlockedSetDiskID(child, node_name)
Iustin Pop's avatar
Iustin Pop committed
552
553
554

    if disk.logical_id is None and disk.physical_id is not None:
      return
555
    if disk.dev_type == constants.LD_DRBD8:
556
      pnode, snode, port, pminor, sminor, secret = disk.logical_id
Iustin Pop's avatar
Iustin Pop committed
557
      if node_name not in (pnode, snode):
558
559
        raise errors.ConfigurationError("DRBD device not knowing node %s" %
                                        node_name)
560
561
      pnode_info = self._UnlockedGetNodeInfo(pnode)
      snode_info = self._UnlockedGetNodeInfo(snode)
Iustin Pop's avatar
Iustin Pop committed
562
563
564
      if pnode_info is None or snode_info is None:
        raise errors.ConfigurationError("Can't find primary or secondary node"
                                        " for %s" % str(disk))
565
566
      p_data = (pnode_info.secondary_ip, port)
      s_data = (snode_info.secondary_ip, port)
Iustin Pop's avatar
Iustin Pop committed
567
      if pnode == node_name:
568
        disk.physical_id = p_data + s_data + (pminor, secret)
Iustin Pop's avatar
Iustin Pop committed
569
      else: # it must be secondary, we tested above
570
        disk.physical_id = s_data + p_data + (sminor, secret)
Iustin Pop's avatar
Iustin Pop committed
571
572
573
574
    else:
      disk.physical_id = disk.logical_id
    return

575
576
577
578
579
580
581
582
583
584
585
586
587
588
  @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)
589
590
591
592
  def AddTcpUdpPort(self, port):
    """Adds a new port to the available port pool.

    """
593
    if not isinstance(port, int):
594
      raise errors.ProgrammerError("Invalid type passed for port")
595

596
    self._config_data.cluster.tcpudp_port_pool.add(port)
597
598
    self._WriteConfig()

599
  @locking.ssynchronized(_config_lock, shared=1)
600
  def GetPortList(self):
601
602
603
    """Returns a copy of the current port list.

    """
604
    return self._config_data.cluster.tcpudp_port_pool.copy()
605

606
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
607
608
609
  def AllocatePort(self):
    """Allocate a port.

610
611
612
    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
613
614

    """
615
    # If there are TCP/IP ports configured, we use them first.
616
617
    if self._config_data.cluster.tcpudp_port_pool:
      port = self._config_data.cluster.tcpudp_port_pool.pop()
618
619
620
    else:
      port = self._config_data.cluster.highest_used_port + 1
      if port >= constants.LAST_DRBD_PORT:
621
622
623
        raise errors.ConfigurationError("The highest used port is greater"
                                        " than %s. Aborting." %
                                        constants.LAST_DRBD_PORT)
624
      self._config_data.cluster.highest_used_port = port
Iustin Pop's avatar
Iustin Pop committed
625
626
627
628

    self._WriteConfig()
    return port

629
  def _UnlockedComputeDRBDMap(self):
630
631
    """Compute the used DRBD minor/nodes.

632
    @rtype: (dict, list)
Iustin Pop's avatar
Iustin Pop committed
633
634
    @return: dictionary of node_name: dict of minor: instance_name;
        the returned dict will have all the nodes in it (even if with
635
636
637
        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
638
639
640

    """
    def _AppendUsedPorts(instance_name, disk, used):
641
      duplicates = []
642
      if disk.dev_type == constants.LD_DRBD8 and len(disk.logical_id) >= 5:
Michael Hanselmann's avatar
Michael Hanselmann committed
643
644
        node_a, node_b, _, minor_a, minor_b = disk.logical_id[:5]
        for node, port in ((node_a, minor_a), (node_b, minor_b)):
645
646
          assert node in used, ("Node '%s' of instance '%s' not found"
                                " in node list" % (node, instance_name))
647
          if port in used[node]:
648
649
650
            duplicates.append((node, port, instance_name, used[node][port]))
          else:
            used[node][port] = instance_name
651
652
      if disk.children:
        for child in disk.children:
653
654
          duplicates.extend(_AppendUsedPorts(instance_name, child, used))
      return duplicates
655

656
    duplicates = []
657
    my_dict = dict((node, {}) for node in self._config_data.nodes)
658
659
660
    for instance in self._config_data.instances.itervalues():
      for disk in instance.disks:
        duplicates.extend(_AppendUsedPorts(instance.name, disk, my_dict))
661
    for (node, minor), instance in self._temporary_drbds.iteritems():
662
      if minor in my_dict[node] and my_dict[node][minor] != instance:
663
664
665
666
        duplicates.append((node, minor, instance, my_dict[node][minor]))
      else:
        my_dict[node][minor] = instance
    return my_dict, duplicates
667

668
669
670
671
672
673
674
675
676
677
678
  @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).

    """
679
680
681
682
683
    d_map, duplicates = self._UnlockedComputeDRBDMap()
    if duplicates:
      raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
                                      str(duplicates))
    return d_map
684

685
686
687
688
689
690
691
692
693
  @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.

694
695
696
    @type instance: string
    @param instance: the instance for which we allocate minors

697
    """
698
    assert isinstance(instance, basestring), \
699
           "Invalid argument '%s' passed to AllocateDRBDMinor" % instance
700

701
702
703
704
    d_map, duplicates = self._UnlockedComputeDRBDMap()
    if duplicates:
      raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
                                      str(duplicates))
705
706
707
708
709
710
711
    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
712
        self._temporary_drbds[(nname, 0)] = instance
713
714
715
716
717
718
719
720
721
722
        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
723
724
725
726
727
      # 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]))
728
      ndata[minor] = instance
729
730
731
732
733
734
735
736
      # 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)
737
738
739
740
    logging.debug("Request to allocate drbd minors, input: %s, returning %s",
                  nodes, result)
    return result

741
  def _UnlockedReleaseDRBDMinors(self, instance):
742
743
744
745
746
747
748
    """Release temporary drbd minors allocated for a given instance.

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

    """
749
750
    assert isinstance(instance, basestring), \
           "Invalid argument passed to ReleaseDRBDMinors"
751
752
753
754
    for key, name in self._temporary_drbds.items():
      if name == instance:
        del self._temporary_drbds[key]

755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
  @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)

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
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
  @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.

    """
827
    return self._config_data.cluster.enabled_hypervisors[0]
828

829
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
830
831
832
  def GetHostKey(self):
    """Return the rsa hostkey from the config.

Iustin Pop's avatar
Iustin Pop committed
833
834
    @rtype: string
    @return: the rsa hostkey
Iustin Pop's avatar
Iustin Pop committed
835
836
837
838

    """
    return self._config_data.cluster.rsahostkeypub

839
840
841
842
843
844
845
  @locking.ssynchronized(_config_lock, shared=1)
  def GetDefaultIAllocator(self):
    """Get the default instance allocator for this cluster.

    """
    return self._config_data.cluster.default_iallocator

846
847
848
849
850
851
852
853
854
  @locking.ssynchronized(_config_lock, shared=1)
  def GetPrimaryIPFamily(self):
    """Get cluster primary ip family.

    @return: primary ip family

    """
    return self._config_data.cluster.primary_ip_family

Guido Trotter's avatar
Guido Trotter committed
855
856
  @locking.ssynchronized(_config_lock, shared=1)
  def LookupNodeGroup(self, target):
857
    """Lookup a node group's UUID.
Guido Trotter's avatar
Guido Trotter committed
858
859

    @type target: string or None
860
    @param target: group name or UUID or None to look for the default
Guido Trotter's avatar
Guido Trotter committed
861
    @rtype: string
862
    @return: nodegroup UUID
Guido Trotter's avatar
Guido Trotter committed
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
    @raises errors.OpPrereqError: when the target group cannot be found

    """
    if target is None:
      if len(self._config_data.nodegroups) != 1:
        raise errors.OpPrereqError("More than one nodegroup exists. Target"
                                   " group must be specified explicitely.")
      else:
        return self._config_data.nodegroups.keys()[0]
    if target in self._config_data.nodegroups:
      return target
    for nodegroup in self._config_data.nodegroups.values():
      if nodegroup.name == target:
        return nodegroup.uuid
    raise errors.OpPrereqError("Nodegroup '%s' not found", target)

Guido Trotter's avatar
Guido Trotter committed
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
  @locking.ssynchronized(_config_lock, shared=1)
  def GetNodeGroup(self, uuid):
    """Lookup a node group.

    @type uuid: string
    @param uuid: group UUID
    @rtype: L{objects.NodeGroup} or None
    @return: nodegroup object, or None if not found

    """
    if uuid not in self._config_data.nodegroups:
      return None

    return self._config_data.nodegroups[uuid]

894
895
896
897
898
899
900
  @locking.ssynchronized(_config_lock, shared=1)
  def GetAllNodeGroupsInfo(self):
    """Get the configuration of all node groups.

    """
    return dict(self._config_data.nodegroups)

Guido Trotter's avatar
Guido Trotter committed
901
902
903
904
905
906
907
  @locking.ssynchronized(_config_lock, shared=1)
  def GetNodeGroupList(self):
    """Get a list of node groups.

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

908
  @locking.ssynchronized(_config_lock)
909
  def AddInstance(self, instance, ec_id):
Iustin Pop's avatar
Iustin Pop committed
910
911
912
913
    """Add an instance to the config.

    This should be used after creating a new instance.

Iustin Pop's avatar
Iustin Pop committed
914
915
916
    @type instance: L{objects.Instance}
    @param instance: the instance object

Iustin Pop's avatar
Iustin Pop committed
917
918
919
920
    """
    if not isinstance(instance, objects.Instance):
      raise errors.ProgrammerError("Invalid type passed to AddInstance")

921
922
    if instance.disk_template != constants.DT_DISKLESS:
      all_lvs = instance.MapLVsByNode()
Iustin Pop's avatar
Iustin Pop committed
923
      logging.info("Instance '%s' DISK_LAYOUT: %s", instance.name, all_lvs)
924

925
926
927
928
    all_macs = self._AllMACs()
    for nic in instance.nics:
      if nic.mac in all_macs:
        raise errors.ConfigurationError("Cannot add instance %s:"
929
930
931
                                        " MAC address '%s' already in use." %
                                        (instance.name, nic.mac))

932
    self._EnsureUUID(instance, ec_id)
933

934
    instance.serial_no = 1
935
    instance.ctime = instance.mtime = time.time()
Iustin Pop's avatar
Iustin Pop committed
936
    self._config_data.instances[instance.name] = instance
937
    self._config_data.cluster.serial_no += 1
938
    self._UnlockedReleaseDRBDMinors(instance.name)
Iustin Pop's avatar
Iustin Pop committed
939
940
    self._WriteConfig()

941
  def _EnsureUUID(self, item, ec_id):
942
943
944
    """Ensures a given object has a valid UUID.

    @param item: the instance or node to be checked
945
    @param ec_id: the execution context id for the uuid reservation
946
947
948

    """
    if not item.uuid:
949
      item.uuid = self._GenerateUniqueID(ec_id)
950
951
952
    elif item.uuid in self._AllIDs(include_temporary=True):
      raise errors.ConfigurationError("Cannot add '%s': UUID %s already"
                                      " in use" % (item.name, item.uuid))
953

954
955
  def _SetInstanceStatus(self, instance_name, status):
    """Set the instance's status to a given value.
Iustin Pop's avatar
Iustin Pop committed
956
957

    """
958
959
    assert isinstance(status, bool), \
           "Invalid status '%s' passed to SetInstanceStatus" % (status,)
Iustin Pop's avatar
Iustin Pop committed
960
961

    if instance_name not in self._config_data.instances:
962
963
      raise errors.ConfigurationError("Unknown instance '%s'" %
                                      instance_name)
Iustin Pop's avatar
Iustin Pop committed
964
    instance = self._config_data.instances[instance_name]
965
966
    if instance.admin_up != status:
      instance.admin_up = status
967
      instance.serial_no += 1
968
      instance.mtime = time.time()
969
      self._WriteConfig()
Iustin Pop's avatar
Iustin Pop committed
970

971
  @locking.ssynchronized(_config_lock)
972
973
974
975
  def MarkInstanceUp(self, instance_name):
    """Mark the instance status to up in the config.

    """
976
    self._SetInstanceStatus(instance_name, True)
977

978
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
979
980
981
982
983
  def RemoveInstance(self, instance_name):
    """Remove the instance from the configuration.

    """
    if instance_name not in self._config_data.instances:
984
      raise errors.ConfigurationError("Unknown instance '%s'" % instance_name)
Iustin Pop's avatar
Iustin Pop committed
985
    del self._config_data.instances[instance_name]
986
    self._config_data.cluster.serial_no += 1
Iustin Pop's avatar
Iustin Pop committed
987
988
    self._WriteConfig()

989
  @locking.ssynchronized(_config_lock)
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
  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
1003
1004
1005
1006
1007
1008

    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],
1009
1010
1011
                                              utils.PathJoin(file_storage_dir,
                                                             inst.name,
                                                             disk.iv_name))
1012

1013
1014
1015
    # Force update of ssconf files
    self._config_data.cluster.serial_no += 1

1016
1017
1018
    self._config_data.instances[inst.name] = inst
    self._WriteConfig()

1019
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
1020
1021
1022
1023
  def MarkInstanceDown(self, instance_name):
    """Mark the status of an instance to down in the configuration.

    """
1024
    self._SetInstanceStatus(instance_name, False)
Iustin Pop's avatar
Iustin Pop committed
1025

1026
1027
1028
1029
1030
1031
1032
1033
  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()

1034
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
1035
1036
1037
  def GetInstanceList(self):
    """Get the list of instances.

Iustin Pop's avatar
Iustin Pop committed
1038
1039
    @return: array of instances, ex. ['instance2.example.com',
        'instance1.example.com']
Iustin Pop's avatar
Iustin Pop committed
1040
1041

    """
1042
    return self._UnlockedGetInstanceList()
Iustin Pop's avatar
Iustin Pop committed
1043

1044
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
1045
1046
1047
1048
1049
  def ExpandInstanceName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    return utils.MatchNameComponent(short_name,
1050
1051
                                    self._config_data.instances.keys(),
                                    case_sensitive=False)
Iustin Pop's avatar
Iustin Pop committed
1052

1053
  def _UnlockedGetInstanceInfo(self, instance_name):
Michael Hanselmann's avatar
Michael Hanselmann committed
1054
    """Returns information about an instance.
1055
1056
1057
1058
1059
1060
1061
1062
1063

    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]

1064
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
1065
  def GetInstanceInfo(self, instance_name):
Michael Hanselmann's avatar
Michael Hanselmann committed
1066
    """Returns information about an instance.
Iustin Pop's avatar
Iustin Pop committed
1067

Michael Hanselmann's avatar
Michael Hanselmann committed
1068
    It takes the information from the configuration file. Other information of
Iustin Pop's avatar
Iustin Pop committed
1069
1070
    an instance are taken from the live systems.

Iustin Pop's avatar
Iustin Pop committed
1071
1072
    @param instance_name: name of the instance, e.g.
        I{instance1.example.com}
Iustin Pop's avatar
Iustin Pop committed
1073

Iustin Pop's avatar
Iustin Pop committed
1074
1075
    @rtype: L{objects.Instance}
    @return: the instance object
Iustin Pop's avatar
Iustin Pop committed
1076
1077

    """
1078
    return self._UnlockedGetInstanceInfo(instance_name)
Iustin Pop's avatar
Iustin Pop committed
1079

1080
1081
1082
1083
1084
  @locking.ssynchronized(_config_lock, shared=1)
  def GetAllInstancesInfo(self):
    """Get the configuration of all instances.

    @rtype: dict
Iustin Pop's avatar
Iustin Pop committed
1085
    @return: dict of (instance, instance_info), where instance_info is what
1086
1087
1088
              would GetInstanceInfo return for the node

    """
1089
1090
    my_dict = dict([(instance, self._UnlockedGetInstanceInfo(instance))
                    for instance in self._UnlockedGetInstanceList()])
1091
1092
    return my_dict

1093
  @locking.ssynchronized(_config_lock)
1094
  def AddNode(self, node, ec_id):
Iustin Pop's avatar
Iustin Pop committed
1095
1096
    """Add a node to the configuration.

Iustin Pop's avatar
Iustin Pop committed
1097
1098
    @type node: L{objects.Node}
    @param node: a Node instance
Iustin Pop's avatar
Iustin Pop committed
1099
1100

    """
1101
    logging.info("Adding node %s to configuration", node.name)
1102

1103
    self._EnsureUUID(node, ec_id)
1104

1105
    node.serial_no = 1
1106
    node.ctime = node.mtime = time.time()
1107
    self._UnlockedAddNodeToGroup(node.name, node.group)
Iustin Pop's avatar
Iustin Pop committed
1108
    self._config_data.nodes[node.name] = node
1109
    self._config_data.cluster.serial_no += 1
Iustin Pop's avatar
Iustin Pop committed
1110
1111
    self._WriteConfig()

1112
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
1113
1114
1115
1116
  def RemoveNode(self, node_name):
    """Remove a node from the configuration.

    """
1117
    logging.info("Removing node %s from configuration", node_name)
1118

Iustin Pop's avatar
Iustin Pop committed
1119
    if node_name not in self._config_data.nodes:
1120
      raise errors.ConfigurationError("Unknown node '%s'" % node_name)
Iustin Pop's avatar
Iustin Pop committed
1121

Guido Trotter's avatar
Guido Trotter committed
1122
    self._UnlockedRemoveNodeFromGroup(self._config_data.nodes[node_name])
Iustin Pop's avatar
Iustin Pop committed
1123
    del self._config_data.nodes[node_name]
1124
    self._config_data.cluster.serial_no += 1
Iustin Pop's avatar
Iustin Pop committed
1125
1126
    self._WriteConfig()

1127
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
1128
1129
1130
1131
1132
  def ExpandNodeName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    return utils.MatchNameComponent(short_name,
1133
1134
                                    self._config_data.nodes.keys(),
                                    case_sensitive=False)
Iustin Pop's avatar
Iustin Pop committed
1135

1136
  def _UnlockedGetNodeInfo(self, node_name):
Iustin Pop's avatar
Iustin Pop committed
1137
1138
    """Get the configuration of a node, as stored in the config.

Iustin Pop's avatar
Iustin Pop committed
1139
1140
    This function is for internal use, when the config lock is already
    held.
1141

Iustin Pop's avatar
Iustin Pop committed
1142
    @param node_name: the node name, e.g. I{node1.example.com}
Iustin Pop's avatar
Iustin Pop committed
1143

Iustin Pop's avatar
Iustin Pop committed
1144
1145
    @rtype: L{objects.Node}
    @return: the node object
Iustin Pop's avatar
Iustin Pop committed
1146
1147
1148
1149
1150
1151
1152

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

    return self._config_data.nodes[node_name]

1153
1154
1155
1156
  @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
1157
    This is just a locked wrapper over L{_UnlockedGetNodeInfo}.
1158

Iustin Pop's avatar
Iustin Pop committed
1159
1160
1161
1162
    @param node_name: the node name, e.g. I{node1.example.com}

    @rtype: L{objects.Node}
    @return: the node object