config.py 23.1 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
36
37
38

"""

import os
import tempfile
import random

from ganeti import errors
39
from ganeti import locking
Iustin Pop's avatar
Iustin Pop committed
40
41
42
43
44
from ganeti import logger
from ganeti import utils
from ganeti import constants
from ganeti import rpc
from ganeti import objects
45
from ganeti import serializer
46
47
48
from ganeti import ssconf


49
50
51
_config_lock = locking.SharedLock()


52
53
54
55
56
57
58
59
def ValidateConfig():
  sstore = ssconf.SimpleStore()

  if sstore.GetConfigVersion() != constants.CONFIG_VERSION:
    raise errors.ConfigurationError("Cluster configuration version"
                                    " mismatch, got %s instead of %s" %
                                    (sstore.GetConfigVersion(),
                                     constants.CONFIG_VERSION))
Iustin Pop's avatar
Iustin Pop committed
60

61

Iustin Pop's avatar
Iustin Pop committed
62
class ConfigWriter:
63
  """The interface to the cluster configuration.
Iustin Pop's avatar
Iustin Pop committed
64

65
  """
Iustin Pop's avatar
Iustin Pop committed
66
  def __init__(self, cfg_file=None, offline=False):
67
    self.write_count = 0
68
    self._lock = _config_lock
Iustin Pop's avatar
Iustin Pop committed
69
70
    self._config_data = None
    self._config_time = None
71
72
    self._config_size = None
    self._config_inode = None
Iustin Pop's avatar
Iustin Pop committed
73
74
75
76
77
    self._offline = offline
    if cfg_file is None:
      self._cfg_file = constants.CLUSTER_CONF_FILE
    else:
      self._cfg_file = cfg_file
78
    self._temporary_ids = set()
79
80
81
82
83
    # 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
    self._my_hostname = utils.HostInfo().name
Iustin Pop's avatar
Iustin Pop committed
84
85
86
87
88
89
90
91
92

  # 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)

93
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
  def GenerateMAC(self):
    """Generate a MAC for an instance.

    This should check the current instances for duplicates.

    """
    self._OpenConfig()
    prefix = self._config_data.cluster.mac_prefix
    all_macs = self._AllMACs()
    retries = 64
    while retries > 0:
      byte1 = random.randrange(0, 256)
      byte2 = random.randrange(0, 256)
      byte3 = random.randrange(0, 256)
      mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
      if mac not in all_macs:
        break
      retries -= 1
    else:
113
      raise errors.ConfigurationError("Can't generate unique MAC")
Iustin Pop's avatar
Iustin Pop committed
114
115
    return mac

116
  @locking.ssynchronized(_config_lock, shared=1)
117
118
119
120
121
122
123
124
125
126
127
  def IsMacInUse(self, mac):
    """Predicate: check if the specified MAC is in use in the Ganeti cluster.

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

    """
    self._OpenConfig()
    all_macs = self._AllMACs()
    return mac in all_macs

128
129
130
131
132
133
134
135
136
137
138
139
  def _ComputeAllLVs(self):
    """Compute the list of all LVs.

    """
    self._OpenConfig()
    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

140
  @locking.ssynchronized(_config_lock, shared=1)
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
  def GenerateUniqueID(self, exceptions=None):
    """Generate an unique disk name.

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

    Args:
      - exceptions: a list with some other names which should be checked
                    for uniqueness (used for example when you want to get
                    more than one id at one time without adding each one in
                    turn to the config file

    Returns: the unique id as a string

    """
    existing = set()
    existing.update(self._temporary_ids)
    existing.update(self._ComputeAllLVs())
    existing.update(self._config_data.instances.keys())
    existing.update(self._config_data.nodes.keys())
    if exceptions is not None:
      existing.update(exceptions)
    retries = 64
    while retries > 0:
165
      unique_id = utils.NewUUID()
166
167
168
      if unique_id not in existing and unique_id is not None:
        break
    else:
169
170
      raise errors.ConfigurationError("Not able generate an unique ID"
                                      " (last tried ID: %s" % unique_id)
171
172
173
    self._temporary_ids.add(unique_id)
    return unique_id

Iustin Pop's avatar
Iustin Pop committed
174
175
176
177
178
179
180
181
182
183
184
185
186
  def _AllMACs(self):
    """Return all MACs present in the config.

    """
    self._OpenConfig()

    result = []
    for instance in self._config_data.instances.values():
      for nic in instance.nics:
        result.append(nic.mac)

    return result

187
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
188
189
190
191
192
193
194
195
196
197
198
  def VerifyConfig(self):
    """Stub verify function.
    """
    self._OpenConfig()

    result = []
    seen_macs = []
    data = self._config_data
    for instance_name in data.instances:
      instance = data.instances[instance_name]
      if instance.primary_node not in data.nodes:
199
        result.append("instance '%s' has invalid primary node '%s'" %
Iustin Pop's avatar
Iustin Pop committed
200
201
202
                      (instance_name, instance.primary_node))
      for snode in instance.secondary_nodes:
        if snode not in data.nodes:
203
          result.append("instance '%s' has invalid secondary node '%s'" %
Iustin Pop's avatar
Iustin Pop committed
204
205
206
                        (instance_name, snode))
      for idx, nic in enumerate(instance.nics):
        if nic.mac in seen_macs:
207
          result.append("instance '%s' has NIC %d mac %s duplicate" %
Iustin Pop's avatar
Iustin Pop committed
208
209
210
211
212
                        (instance_name, idx, nic.mac))
        else:
          seen_macs.append(nic.mac)
    return result

213
  def _UnlockedSetDiskID(self, disk, node_name):
Iustin Pop's avatar
Iustin Pop committed
214
215
216
217
218
219
220
221
    """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.

222
223
    This function is for internal use, when the config lock is already held.

Iustin Pop's avatar
Iustin Pop committed
224
225
226
    """
    if disk.children:
      for child in disk.children:
227
        self._UnlockedSetDiskID(child, node_name)
Iustin Pop's avatar
Iustin Pop committed
228
229
230

    if disk.logical_id is None and disk.physical_id is not None:
      return
231
    if disk.dev_type in constants.LDS_DRBD:
Iustin Pop's avatar
Iustin Pop committed
232
233
      pnode, snode, port = disk.logical_id
      if node_name not in (pnode, snode):
234
235
        raise errors.ConfigurationError("DRBD device not knowing node %s" %
                                        node_name)
236
237
      pnode_info = self._UnlockedGetNodeInfo(pnode)
      snode_info = self._UnlockedGetNodeInfo(snode)
Iustin Pop's avatar
Iustin Pop committed
238
239
240
241
242
243
244
245
246
247
248
249
250
      if pnode_info is None or snode_info is None:
        raise errors.ConfigurationError("Can't find primary or secondary node"
                                        " for %s" % str(disk))
      if pnode == node_name:
        disk.physical_id = (pnode_info.secondary_ip, port,
                            snode_info.secondary_ip, port)
      else: # it must be secondary, we tested above
        disk.physical_id = (snode_info.secondary_ip, port,
                            pnode_info.secondary_ip, port)
    else:
      disk.physical_id = disk.logical_id
    return

251
252
253
254
255
256
257
258
259
260
261
262
263
264
  @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)
265
266
267
268
  def AddTcpUdpPort(self, port):
    """Adds a new port to the available port pool.

    """
269
    if not isinstance(port, int):
270
      raise errors.ProgrammerError("Invalid type passed for port")
271
272

    self._OpenConfig()
273
    self._config_data.cluster.tcpudp_port_pool.add(port)
274
275
    self._WriteConfig()

276
  @locking.ssynchronized(_config_lock, shared=1)
277
  def GetPortList(self):
278
279
280
281
    """Returns a copy of the current port list.

    """
    self._OpenConfig()
282
    return self._config_data.cluster.tcpudp_port_pool.copy()
283

284
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
285
286
287
  def AllocatePort(self):
    """Allocate a port.

288
289
290
    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
291
292
293
294

    """
    self._OpenConfig()

295
    # If there are TCP/IP ports configured, we use them first.
296
297
    if self._config_data.cluster.tcpudp_port_pool:
      port = self._config_data.cluster.tcpudp_port_pool.pop()
298
299
300
    else:
      port = self._config_data.cluster.highest_used_port + 1
      if port >= constants.LAST_DRBD_PORT:
301
302
303
        raise errors.ConfigurationError("The highest used port is greater"
                                        " than %s. Aborting." %
                                        constants.LAST_DRBD_PORT)
304
      self._config_data.cluster.highest_used_port = port
Iustin Pop's avatar
Iustin Pop committed
305
306
307
308

    self._WriteConfig()
    return port

309
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
310
311
312
313
314
315
316
317
318
319
  def GetHostKey(self):
    """Return the rsa hostkey from the config.

    Args: None

    Returns: rsa hostkey
    """
    self._OpenConfig()
    return self._config_data.cluster.rsahostkeypub

320
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
321
322
323
324
325
326
327
328
329
330
331
  def AddInstance(self, instance):
    """Add an instance to the config.

    This should be used after creating a new instance.

    Args:
      instance: the instance object
    """
    if not isinstance(instance, objects.Instance):
      raise errors.ProgrammerError("Invalid type passed to AddInstance")

332
333
334
    if instance.disk_template != constants.DT_DISKLESS:
      all_lvs = instance.MapLVsByNode()
      logger.Info("Instance '%s' DISK_LAYOUT: %s" % (instance.name, all_lvs))
335

Iustin Pop's avatar
Iustin Pop committed
336
337
338
339
    self._OpenConfig()
    self._config_data.instances[instance.name] = instance
    self._WriteConfig()

340
341
  def _SetInstanceStatus(self, instance_name, status):
    """Set the instance's status to a given value.
Iustin Pop's avatar
Iustin Pop committed
342
343

    """
344
345
346
347
    if status not in ("up", "down"):
      raise errors.ProgrammerError("Invalid status '%s' passed to"
                                   " ConfigWriter._SetInstanceStatus()" %
                                   status)
Iustin Pop's avatar
Iustin Pop committed
348
349
350
    self._OpenConfig()

    if instance_name not in self._config_data.instances:
351
352
      raise errors.ConfigurationError("Unknown instance '%s'" %
                                      instance_name)
Iustin Pop's avatar
Iustin Pop committed
353
    instance = self._config_data.instances[instance_name]
354
355
356
    if instance.status != status:
      instance.status = status
      self._WriteConfig()
Iustin Pop's avatar
Iustin Pop committed
357

358
  @locking.ssynchronized(_config_lock)
359
360
361
362
363
364
  def MarkInstanceUp(self, instance_name):
    """Mark the instance status to up in the config.

    """
    self._SetInstanceStatus(instance_name, "up")

365
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
366
367
368
369
370
371
372
  def RemoveInstance(self, instance_name):
    """Remove the instance from the configuration.

    """
    self._OpenConfig()

    if instance_name not in self._config_data.instances:
373
      raise errors.ConfigurationError("Unknown instance '%s'" % instance_name)
Iustin Pop's avatar
Iustin Pop committed
374
375
376
    del self._config_data.instances[instance_name]
    self._WriteConfig()

377
  @locking.ssynchronized(_config_lock)
378
379
380
381
382
383
384
385
386
387
388
389
390
391
  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.

    """
    self._OpenConfig()
    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
392
393
394
395
396
397
398
399
400
401

    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],
                                              os.path.join(file_storage_dir,
                                                           inst.name,
                                                           disk.iv_name))

402
403
404
    self._config_data.instances[inst.name] = inst
    self._WriteConfig()

405
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
406
407
408
409
  def MarkInstanceDown(self, instance_name):
    """Mark the status of an instance to down in the configuration.

    """
410
    self._SetInstanceStatus(instance_name, "down")
Iustin Pop's avatar
Iustin Pop committed
411

412
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
413
414
415
416
417
418
419
420
421
422
423
424
  def GetInstanceList(self):
    """Get the list of instances.

    Returns:
      array of instances, ex. ['instance2.example.com','instance1.example.com']
      these contains all the instances, also the ones in Admin_down state

    """
    self._OpenConfig()

    return self._config_data.instances.keys()

425
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
426
427
428
429
430
431
432
433
434
  def ExpandInstanceName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    self._OpenConfig()

    return utils.MatchNameComponent(short_name,
                                    self._config_data.instances.keys())

435
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
  def GetInstanceInfo(self, instance_name):
    """Returns informations about an instance.

    It takes the information from the configuration file. Other informations of
    an instance are taken from the live systems.

    Args:
      instance: name of the instance, ex instance1.example.com

    Returns:
      the instance object

    """
    self._OpenConfig()

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

    return self._config_data.instances[instance_name]

456
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
457
458
459
460
461
462
463
464
465
466
467
  def AddNode(self, node):
    """Add a node to the configuration.

    Args:
      node: an object.Node instance

    """
    self._OpenConfig()
    self._config_data.nodes[node.name] = node
    self._WriteConfig()

468
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
469
470
471
472
473
474
  def RemoveNode(self, node_name):
    """Remove a node from the configuration.

    """
    self._OpenConfig()
    if node_name not in self._config_data.nodes:
475
      raise errors.ConfigurationError("Unknown node '%s'" % node_name)
Iustin Pop's avatar
Iustin Pop committed
476
477
478
479

    del self._config_data.nodes[node_name]
    self._WriteConfig()

480
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
481
482
483
484
485
486
487
488
489
  def ExpandNodeName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    self._OpenConfig()

    return utils.MatchNameComponent(short_name,
                                    self._config_data.nodes.keys())

490
  def _UnlockedGetNodeInfo(self, node_name):
Iustin Pop's avatar
Iustin Pop committed
491
492
    """Get the configuration of a node, as stored in the config.

493
494
    This function is for internal use, when the config lock is already held.

Iustin Pop's avatar
Iustin Pop committed
495
496
497
498
499
500
501
502
503
504
505
506
    Args: node: nodename (tuple) of the node

    Returns: the node object

    """
    self._OpenConfig()

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

    return self._config_data.nodes[node_name]

507
508
509
510
511
512
513
514
515
516
517
518
519

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

    Args: node: nodename (tuple) of the node

    Returns: the node object

    """
    return self._UnlockedGetNodeInfo(node_name)

  def _UnlockedGetNodeList(self):
Iustin Pop's avatar
Iustin Pop committed
520
521
    """Return the list of nodes which are in the configuration.

522
523
    This function is for internal use, when the config lock is already held.

Iustin Pop's avatar
Iustin Pop committed
524
525
526
527
    """
    self._OpenConfig()
    return self._config_data.nodes.keys()

528
529
530
531
532
533
534
535
536

  @locking.ssynchronized(_config_lock, shared=1)
  def GetNodeList(self):
    """Return the list of nodes which are in the configuration.

    """
    return self._UnlockedGetNodeList()

  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
  def DumpConfig(self):
    """Return the entire configuration of the cluster.
    """
    self._OpenConfig()
    return self._config_data

  def _BumpSerialNo(self):
    """Bump up the serial number of the config.

    """
    self._config_data.cluster.serial_no += 1

  def _OpenConfig(self):
    """Read the config data from disk.

    In case we already have configuration data and the config file has
    the same mtime as when we read it, we skip the parsing of the
    file, since de-serialisation could be slow.

    """
    try:
      st = os.stat(self._cfg_file)
    except OSError, err:
560
      raise errors.ConfigurationError("Can't stat config file: %s" % err)
Iustin Pop's avatar
Iustin Pop committed
561
562
    if (self._config_data is not None and
        self._config_time is not None and
563
564
565
        self._config_time == st.st_mtime and
        self._config_size == st.st_size and
        self._config_inode == st.st_ino):
Iustin Pop's avatar
Iustin Pop committed
566
567
      # data is current, so skip loading of config file
      return
568
569
570
571

    # Make sure the configuration has the right version
    ValidateConfig()

Iustin Pop's avatar
Iustin Pop committed
572
573
574
    f = open(self._cfg_file, 'r')
    try:
      try:
575
        data = objects.ConfigData.FromDict(serializer.Load(f.read()))
Iustin Pop's avatar
Iustin Pop committed
576
      except Exception, err:
577
        raise errors.ConfigurationError(err)
Iustin Pop's avatar
Iustin Pop committed
578
579
580
    finally:
      f.close()
    if (not hasattr(data, 'cluster') or
581
        not hasattr(data.cluster, 'rsahostkeypub')):
582
      raise errors.ConfigurationError("Incomplete configuration"
583
                                      " (missing cluster.rsahostkeypub)")
Iustin Pop's avatar
Iustin Pop committed
584
585
    self._config_data = data
    self._config_time = st.st_mtime
586
587
    self._config_size = st.st_size
    self._config_inode = st.st_ino
Iustin Pop's avatar
Iustin Pop committed
588
589
590
591
592
593
594
595
596
597
598

  def _DistributeConfig(self):
    """Distribute the configuration to the other nodes.

    Currently, this only copies the configuration file. In the future,
    it could be used to encapsulate the 2/3-phase update mechanism.

    """
    if self._offline:
      return True
    bad = False
599
    nodelist = self._UnlockedGetNodeList()
600
    myhostname = self._my_hostname
Iustin Pop's avatar
Iustin Pop committed
601

602
603
604
605
    try:
      nodelist.remove(myhostname)
    except ValueError:
      pass
Iustin Pop's avatar
Iustin Pop committed
606

607
608
    result = rpc.call_upload_file(nodelist, self._cfg_file)
    for node in nodelist:
Iustin Pop's avatar
Iustin Pop committed
609
610
611
612
613
614
615
616
617
618
619
620
621
      if not result[node]:
        logger.Error("copy of file %s to node %s failed" %
                     (self._cfg_file, node))
        bad = True
    return not bad

  def _WriteConfig(self, destination=None):
    """Write the configuration data to persistent storage.

    """
    if destination is None:
      destination = self._cfg_file
    self._BumpSerialNo()
622
    txt = serializer.Dump(self._config_data.ToDict())
Iustin Pop's avatar
Iustin Pop committed
623
624
625
626
    dir_name, file_name = os.path.split(destination)
    fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
    f = os.fdopen(fd, 'w')
    try:
627
      f.write(txt)
Iustin Pop's avatar
Iustin Pop committed
628
629
630
631
632
      os.fsync(f.fileno())
    finally:
      f.close()
    # we don't need to do os.close(fd) as f.close() did it
    os.rename(name, destination)
633
    self.write_count += 1
634
635
636
637
    # re-set our cache as not to re-read the config file
    try:
      st = os.stat(destination)
    except OSError, err:
638
      raise errors.ConfigurationError("Can't stat config file: %s" % err)
639
640
641
642
    self._config_time = st.st_mtime
    self._config_size = st.st_size
    self._config_inode = st.st_ino
    # and redistribute the config file
Iustin Pop's avatar
Iustin Pop committed
643
644
    self._DistributeConfig()

645
  @locking.ssynchronized(_config_lock)
Iustin Pop's avatar
Iustin Pop committed
646
  def InitConfig(self, node, primary_ip, secondary_ip,
647
                 hostkeypub, mac_prefix, vg_name, def_bridge):
Iustin Pop's avatar
Iustin Pop committed
648
649
650
651
652
653
654
655
656
657
658
    """Create the initial cluster configuration.

    It will contain the current node, which will also be the master
    node, and no instances or operating systmes.

    Args:
      node: the nodename of the initial node
      primary_ip: the IP address of the current host
      secondary_ip: the secondary IP of the current host or None
      hostkeypub: the public hostkey of this host

659
    """
Iustin Pop's avatar
Iustin Pop committed
660
    hu_port = constants.FIRST_DRBD_PORT - 1
661
    globalconfig = objects.Cluster(serial_no=1,
Iustin Pop's avatar
Iustin Pop committed
662
663
664
665
                                   rsahostkeypub=hostkeypub,
                                   highest_used_port=hu_port,
                                   mac_prefix=mac_prefix,
                                   volume_group_name=vg_name,
666
667
                                   default_bridge=def_bridge,
                                   tcpudp_port_pool=set())
Iustin Pop's avatar
Iustin Pop committed
668
669
670
671
672
673
674
    if secondary_ip is None:
      secondary_ip = primary_ip
    nodeconfig = objects.Node(name=node, primary_ip=primary_ip,
                              secondary_ip=secondary_ip)

    self._config_data = objects.ConfigData(nodes={node: nodeconfig},
                                           instances={},
675
                                           cluster=globalconfig)
Iustin Pop's avatar
Iustin Pop committed
676
677
    self._WriteConfig()

678
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
679
680
681
682
683
684
685
  def GetVGName(self):
    """Return the volume group name.

    """
    self._OpenConfig()
    return self._config_data.cluster.volume_group_name

686
  @locking.ssynchronized(_config_lock)
687
688
689
690
691
  def SetVGName(self, vg_name):
    """Set the volume group name.

    """
    self._OpenConfig()
692
    self._config_data.cluster.volume_group_name = vg_name
693
694
    self._WriteConfig()

695
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
696
697
698
699
700
701
702
  def GetDefBridge(self):
    """Return the default bridge.

    """
    self._OpenConfig()
    return self._config_data.cluster.default_bridge

703
  @locking.ssynchronized(_config_lock, shared=1)
Iustin Pop's avatar
Iustin Pop committed
704
705
706
707
708
709
  def GetMACPrefix(self):
    """Return the mac prefix.

    """
    self._OpenConfig()
    return self._config_data.cluster.mac_prefix
710

711
  @locking.ssynchronized(_config_lock, shared=1)
712
713
714
715
716
717
718
719
720
721
  def GetClusterInfo(self):
    """Returns informations about the cluster

    Returns:
      the cluster object

    """
    self._OpenConfig()

    return self._config_data.cluster
722

723
  @locking.ssynchronized(_config_lock)
724
725
726
727
728
729
730
731
732
733
734
  def Update(self, target):
    """Notify function to be called after updates.

    This function must be called when an object (as returned by
    GetInstanceInfo, GetNodeInfo, GetCluster) has been updated and the
    caller wants the modifications saved to the backing store. Note
    that all modified objects will be saved, but the target argument
    is the one the caller wants to ensure that it's saved.

    """
    if self._config_data is None:
735
736
      raise errors.ProgrammerError("Configuration file not read,"
                                   " cannot save.")
737
738
739
740
741
742
743
    if isinstance(target, objects.Cluster):
      test = target == self._config_data.cluster
    elif isinstance(target, objects.Node):
      test = target in self._config_data.nodes.values()
    elif isinstance(target, objects.Instance):
      test = target in self._config_data.instances.values()
    else:
744
745
      raise errors.ProgrammerError("Invalid object type (%s) passed to"
                                   " ConfigWriter.Update" % type(target))
746
    if not test:
747
748
      raise errors.ConfigurationError("Configuration updated since object"
                                      " has been read or unknown object")
749
    self._WriteConfig()