bootstrap.py 23.2 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
#
#

# Copyright (C) 2006, 2007, 2008 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.


"""Functions to bootstrap a new cluster.

"""

import os
import os.path
import re
29
import logging
30
import tempfile
31
import time
32
33
34
35
36
37
38

from ganeti import rpc
from ganeti import ssh
from ganeti import utils
from ganeti import errors
from ganeti import config
from ganeti import constants
39
from ganeti import objects
40
from ganeti import ssconf
41
from ganeti import serializer
42
from ganeti import hypervisor
43

44

45
def _InitSSHSetup():
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
  """Setup the SSH configuration for the cluster.

  This generates a dsa keypair for root, adds the pub key to the
  permitted hosts and adds the hostkey to its own known hosts.

  """
  priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)

  for name in priv_key, pub_key:
    if os.path.exists(name):
      utils.CreateBackup(name)
    utils.RemoveFile(name)

  result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
                         "-f", priv_key,
                         "-q", "-N", ""])
  if result.failed:
    raise errors.OpExecError("Could not generate ssh keypair, error %s" %
                             result.output)

66
  utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
67
68


69
def GenerateSelfSignedSslCert(file_name, validity=(365 * 5)):
70
  """Generates a self-signed SSL certificate.
71

72
73
74
75
  @type file_name: str
  @param file_name: Path to output file
  @type validity: int
  @param validity: Validity for certificate in days
76
77

  """
78
79
  (fd, tmp_file_name) = tempfile.mkstemp(dir=os.path.dirname(file_name))
  try:
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
    try:
      # Set permissions before writing key
      os.chmod(tmp_file_name, 0600)

      result = utils.RunCmd(["openssl", "req", "-new", "-newkey", "rsa:1024",
                             "-days", str(validity), "-nodes", "-x509",
                             "-keyout", tmp_file_name, "-out", tmp_file_name,
                             "-batch"])
      if result.failed:
        raise errors.OpExecError("Could not generate SSL certificate, command"
                                 " %s had exitcode %s and error message %s" %
                                 (result.cmd, result.exit_code, result.output))

      # Make read-only
      os.chmod(tmp_file_name, 0400)

      os.rename(tmp_file_name, file_name)
    finally:
      utils.RemoveFile(tmp_file_name)
99
  finally:
100
    os.close(fd)
101
102


103
104
105
106
107
108
109
def GenerateHmacKey(file_name):
  """Writes a new HMAC key.

  @type file_name: str
  @param file_name: Path to output file

  """
110
111
112
113
  utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,
                  backup=True)


114
def GenerateClusterCrypto(new_cluster_cert, new_rapi_cert, new_confd_hmac_key,
115
116
117
118
                          rapi_cert_pem=None,
                          nodecert_file=constants.NODED_CERT_FILE,
                          rapicert_file=constants.RAPI_CERT_FILE,
                          hmackey_file=constants.CONFD_HMAC_KEY):
119
120
121
122
123
124
  """Updates the cluster certificates, keys and secrets.

  @type new_cluster_cert: bool
  @param new_cluster_cert: Whether to generate a new cluster certificate
  @type new_rapi_cert: bool
  @param new_rapi_cert: Whether to generate a new RAPI certificate
125
126
  @type new_confd_hmac_key: bool
  @param new_confd_hmac_key: Whether to generate a new HMAC key
127
128
  @type rapi_cert_pem: string
  @param rapi_cert_pem: New RAPI certificate in PEM format
129
130
131
132
133
134
  @type nodecert_file: string
  @param nodecert_file: optional override of the node cert file path
  @type rapicert_file: string
  @param rapicert_file: optional override of the rapi cert file path
  @type hmackey_file: string
  @param hmackey_file: optional override of the hmac key file path
135
136

  """
137
  # noded SSL certificate
138
  cluster_cert_exists = os.path.exists(nodecert_file)
139
140
  if new_cluster_cert or not cluster_cert_exists:
    if cluster_cert_exists:
141
      utils.CreateBackup(nodecert_file)
142

143
144
    logging.debug("Generating new cluster certificate at %s", nodecert_file)
    GenerateSelfSignedSslCert(nodecert_file)
145

146
  # confd HMAC key
147
148
149
  if new_confd_hmac_key or not os.path.exists(hmackey_file):
    logging.debug("Writing new confd HMAC key to %s", hmackey_file)
    GenerateHmacKey(hmackey_file)
150
151

  # RAPI
152
  rapi_cert_exists = os.path.exists(rapicert_file)
153
154
155

  if rapi_cert_pem:
    # Assume rapi_pem contains a valid PEM-formatted certificate and key
156
157
    logging.debug("Writing RAPI certificate at %s", rapicert_file)
    utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)
158
159
160

  elif new_rapi_cert or not rapi_cert_exists:
    if rapi_cert_exists:
161
      utils.CreateBackup(rapicert_file)
162

163
164
    logging.debug("Generating new RAPI certificate at %s", rapicert_file)
    GenerateSelfSignedSslCert(rapicert_file)
165
166


167
def _InitGanetiServerSetup(master_name):
168
169
170
171
172
173
  """Setup the necessary configuration for the initial node daemon.

  This creates the nodepass file containing the shared password for
  the cluster and also generates the SSL certificate.

  """
174
175
  # Generate cluster secrets
  GenerateClusterCrypto(True, False, False)
176

177
  result = utils.RunCmd([constants.DAEMON_UTIL, "start", constants.NODED])
178
179
180
181
182
  if result.failed:
    raise errors.OpExecError("Could not start the node daemon, command %s"
                             " had exitcode %s and error %s" %
                             (result.cmd, result.exit_code, result.output))

183
184
185
186
187
188
189
  _WaitForNodeDaemon(master_name)


def _WaitForNodeDaemon(node_name):
  """Wait for node daemon to become responsive.

  """
190
  def _CheckNodeDaemon():
191
    result = rpc.RpcRunner.call_version([node_name])[node_name]
192
193
    if result.fail_msg:
      raise utils.RetryAgain()
194

195
196
197
  try:
    utils.Retry(_CheckNodeDaemon, 1.0, 10.0)
  except utils.RetryTimeout:
198
199
200
    raise errors.OpExecError("Node daemon on %s didn't answer queries within"
                             " 10 seconds" % node_name)

201

202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
def _InitFileStorage(file_storage_dir):
  """Initialize if needed the file storage.

  @param file_storage_dir: the user-supplied value
  @return: either empty string (if file storage was disabled at build
      time) or the normalized path to the storage directory

  """
  if not constants.ENABLE_FILE_STORAGE:
    return ""

  file_storage_dir = os.path.normpath(file_storage_dir)

  if not os.path.isabs(file_storage_dir):
    raise errors.OpPrereqError("The file storage directory you passed is"
                               " not an absolute path.", errors.ECODE_INVAL)

  if not os.path.exists(file_storage_dir):
    try:
      os.makedirs(file_storage_dir, 0750)
    except OSError, err:
      raise errors.OpPrereqError("Cannot create file storage directory"
                                 " '%s': %s" % (file_storage_dir, err),
                                 errors.ECODE_ENVIRON)

  if not os.path.isdir(file_storage_dir):
    raise errors.OpPrereqError("The file storage directory '%s' is not"
                               " a directory." % file_storage_dir,
                               errors.ECODE_ENVIRON)
  return file_storage_dir


234
def InitCluster(cluster_name, mac_prefix,
235
                master_netdev, file_storage_dir, candidate_pool_size,
236
237
                secondary_ip=None, vg_name=None, beparams=None,
                nicparams=None, hvparams=None, enabled_hypervisors=None,
238
                modify_etc_hosts=True, modify_ssh_setup=True,
239
240
                maintain_node_health=False,
                uid_pool=None):
241
242
  """Initialise the cluster.

243
244
245
  @type candidate_pool_size: int
  @param candidate_pool_size: master candidate pool size

246
  """
247
  # TODO: complete the docstring
248
  if config.ConfigWriter.IsCluster():
249
250
    raise errors.OpPrereqError("Cluster is already initialised",
                               errors.ECODE_STATE)
251

252
253
  if not enabled_hypervisors:
    raise errors.OpPrereqError("Enabled hypervisors list must contain at"
254
                               " least one member", errors.ECODE_INVAL)
255
256
257
  invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES
  if invalid_hvs:
    raise errors.OpPrereqError("Enabled hypervisors contains invalid"
258
259
                               " entries: %s" % invalid_hvs,
                               errors.ECODE_INVAL)
260

261
  hostname = utils.GetHostInfo()
262
263
264
265

  if hostname.ip.startswith("127."):
    raise errors.OpPrereqError("This host's IP resolves to the private"
                               " range (%s). Please fix DNS or %s." %
266
267
                               (hostname.ip, constants.ETC_HOSTS),
                               errors.ECODE_ENVIRON)
268

269
  if not utils.OwnIpAddress(hostname.ip):
270
271
    raise errors.OpPrereqError("Inconsistency: this host's name resolves"
                               " to %s,\nbut this ip address does not"
272
273
                               " belong to this host. Aborting." %
                               hostname.ip, errors.ECODE_ENVIRON)
274

275
  clustername = utils.GetHostInfo(utils.HostInfo.NormalizeName(cluster_name))
276
277
278

  if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
                   timeout=5):
279
280
    raise errors.OpPrereqError("Cluster IP already active. Aborting.",
                               errors.ECODE_NOTUNIQUE)
281
282
283

  if secondary_ip:
    if not utils.IsValidIP(secondary_ip):
284
285
      raise errors.OpPrereqError("Invalid secondary ip given",
                                 errors.ECODE_INVAL)
286
    if (secondary_ip != hostname.ip and
287
        not utils.OwnIpAddress(secondary_ip)):
288
289
      raise errors.OpPrereqError("You gave %s as secondary IP,"
                                 " but it does not belong to this host." %
290
                                 secondary_ip, errors.ECODE_ENVIRON)
291
292
  else:
    secondary_ip = hostname.ip
293
294
295
296
297
298
299

  if vg_name is not None:
    # Check if volume group is valid
    vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
                                          constants.MIN_VG_SIZE)
    if vgstatus:
      raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
300
301
                                 " you are not using lvm" % vgstatus,
                                 errors.ECODE_INVAL)
302

303
  file_storage_dir = _InitFileStorage(file_storage_dir)
304
305

  if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
306
307
    raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,
                               errors.ECODE_INVAL)
308
309
310
311
312

  result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
  if result.failed:
    raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
                               (master_netdev,
313
                                result.output.strip()), errors.ECODE_INVAL)
314

315
316
317
  dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
  utils.EnsureDirs(dirs)

318
  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
319
320
321
  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
  objects.NIC.CheckParameterSyntax(nicparams)

322
323
324
325
326
  # hvparams is a mapping of hypervisor->hvparams dict
  for hv_name, hv_params in hvparams.iteritems():
    utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
    hv_class = hypervisor.GetHypervisor(hv_name)
    hv_class.CheckParameterSyntax(hv_params)
327

328
  # set up the inter-node password and certificate
329
  _InitGanetiServerSetup(hostname.name)
330
331

  # set up ssh config and /etc/hosts
332
  sshline = utils.ReadFile(constants.SSH_HOST_RSA_PUB)
333
334
  sshkey = sshline.split(" ")[1]

335
336
337
  if modify_etc_hosts:
    utils.AddHostToEtcHosts(hostname.name)

338
339
  if modify_ssh_setup:
    _InitSSHSetup()
340

341
342
  now = time.time()

343
  # init of cluster config file
344
345
346
347
348
349
350
  cluster_config = objects.Cluster(
    serial_no=1,
    rsahostkeypub=sshkey,
    highest_used_port=(constants.FIRST_DRBD_PORT - 1),
    mac_prefix=mac_prefix,
    volume_group_name=vg_name,
    tcpudp_port_pool=set(),
351
352
353
354
355
    master_node=hostname.name,
    master_ip=clustername.ip,
    master_netdev=master_netdev,
    cluster_name=clustername.name,
    file_storage_dir=file_storage_dir,
356
    enabled_hypervisors=enabled_hypervisors,
357
    beparams={constants.PP_DEFAULT: beparams},
358
    nicparams={constants.PP_DEFAULT: nicparams},
359
    hvparams=hvparams,
360
    candidate_pool_size=candidate_pool_size,
Guido Trotter's avatar
Guido Trotter committed
361
    modify_etc_hosts=modify_etc_hosts,
362
    modify_ssh_setup=modify_ssh_setup,
363
    uid_pool=uid_pool,
364
365
366
    ctime=now,
    mtime=now,
    uuid=utils.NewUUID(),
367
    maintain_node_health=maintain_node_health,
368
369
370
    )
  master_node_config = objects.Node(name=hostname.name,
                                    primary_ip=hostname.ip,
371
                                    secondary_ip=secondary_ip,
372
373
                                    serial_no=1,
                                    master_candidate=True,
374
                                    offline=False, drained=False,
375
                                    )
376
  InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)
377
  cfg = config.ConfigWriter()
378
  ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
379
  cfg.Update(cfg.GetClusterInfo(), logging.error)
380

Iustin Pop's avatar
Iustin Pop committed
381
382
  # start the master ip
  # TODO: Review rpc call from bootstrap
383
  # TODO: Warn on failed start master
384
  rpc.RpcRunner.call_node_start_master(hostname.name, True, False)
Iustin Pop's avatar
Iustin Pop committed
385

386

Oleksiy Mishchenko's avatar
Oleksiy Mishchenko committed
387
388
def InitConfig(version, cluster_config, master_node_config,
               cfg_file=constants.CLUSTER_CONF_FILE):
Iustin Pop's avatar
Iustin Pop committed
389
390
391
392
393
394
  """Create the initial cluster configuration.

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

  @type version: int
Iustin Pop's avatar
Iustin Pop committed
395
396
397
398
399
400
401
402
  @param version: configuration version
  @type cluster_config: L{objects.Cluster}
  @param cluster_config: cluster configuration
  @type master_node_config: L{objects.Node}
  @param master_node_config: master node configuration
  @type cfg_file: string
  @param cfg_file: configuration file path

Iustin Pop's avatar
Iustin Pop committed
403
404
405
406
407
  """
  nodes = {
    master_node_config.name: master_node_config,
    }

408
  now = time.time()
Iustin Pop's avatar
Iustin Pop committed
409
410
411
412
  config_data = objects.ConfigData(version=version,
                                   cluster=cluster_config,
                                   nodes=nodes,
                                   instances={},
413
414
                                   serial_no=1,
                                   ctime=now, mtime=now)
415
416
417
  utils.WriteFile(cfg_file,
                  data=serializer.Dump(config_data.ToDict()),
                  mode=0600)
Oleksiy Mishchenko's avatar
Oleksiy Mishchenko committed
418
419


Iustin Pop's avatar
Iustin Pop committed
420
421
422
423
424
425
426
def FinalizeClusterDestroy(master):
  """Execute the last steps of cluster destroy

  This function shuts down all the daemons, completing the destroy
  begun in cmdlib.LUDestroyOpcode.

  """
427
428
  cfg = config.ConfigWriter()
  modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
429
  result = rpc.RpcRunner.call_node_stop_master(master, True)
430
  msg = result.fail_msg
431
  if msg:
432
    logging.warning("Could not disable the master role: %s", msg)
433
  result = rpc.RpcRunner.call_node_leave_cluster(master, modify_ssh_setup)
434
  msg = result.fail_msg
435
436
437
  if msg:
    logging.warning("Could not shutdown the node daemon and cleanup"
                    " the node: %s", msg)
Iustin Pop's avatar
Iustin Pop committed
438
439


Iustin Pop's avatar
Iustin Pop committed
440
def SetupNodeDaemon(cluster_name, node, ssh_key_check):
441
442
  """Add a node to the cluster.

443
444
445
  This function must be called before the actual opcode, and will ssh
  to the remote node, copy the needed files, and start ganeti-noded,
  allowing the master to do the rest via normal rpc calls.
446

Iustin Pop's avatar
Iustin Pop committed
447
448
449
  @param cluster_name: the cluster name
  @param node: the name of the new node
  @param ssh_key_check: whether to do a strict key check
450
451

  """
Iustin Pop's avatar
Iustin Pop committed
452
  sshrunner = ssh.SshRunner(cluster_name)
453

454
  noded_cert = utils.ReadFile(constants.NODED_CERT_FILE)
455
  rapi_cert = utils.ReadFile(constants.RAPI_CERT_FILE)
456
  confd_hmac_key = utils.ReadFile(constants.CONFD_HMAC_KEY)
457

458
459
460
  # in the base64 pem encoding, neither '!' nor '.' are valid chars,
  # so we use this to detect an invalid certificate; as long as the
  # cert doesn't contain this, the here-document will be correctly
461
462
  # parsed by the shell sequence below. HMAC keys are hexadecimal strings,
  # so the same restrictions apply.
463
  for content in (noded_cert, rapi_cert, confd_hmac_key):
464
465
    if re.search('^!EOF\.', content, re.MULTILINE):
      raise errors.OpExecError("invalid SSL certificate or HMAC key")
466
467
468

  if not noded_cert.endswith("\n"):
    noded_cert += "\n"
469
470
  if not rapi_cert.endswith("\n"):
    rapi_cert += "\n"
471
472
  if not confd_hmac_key.endswith("\n"):
    confd_hmac_key += "\n"
473
474
475
476
477
478
479

  # set up inter-node password and certificate and restarts the node daemon
  # and then connect with ssh to set password and start ganeti-noded
  # note that all the below variables are sanitized at this point,
  # either by being constants or by the checks above
  mycommand = ("umask 077 && "
               "cat > '%s' << '!EOF.' && \n"
480
481
482
               "%s!EOF.\n"
               "cat > '%s' << '!EOF.' && \n"
               "%s!EOF.\n"
483
484
485
               "cat > '%s' << '!EOF.' && \n"
               "%s!EOF.\n"
               "chmod 0400 %s %s %s && "
486
               "%s start %s" %
487
               (constants.NODED_CERT_FILE, noded_cert,
488
                constants.RAPI_CERT_FILE, rapi_cert,
489
                constants.CONFD_HMAC_KEY, confd_hmac_key,
490
                constants.NODED_CERT_FILE, constants.RAPI_CERT_FILE,
491
                constants.CONFD_HMAC_KEY,
492
                constants.DAEMON_UTIL, constants.NODED))
493

494
495
496
497
  result = sshrunner.Run(node, 'root', mycommand, batch=False,
                         ask_key=ssh_key_check,
                         use_cluster_key=False,
                         strict_host_check=ssh_key_check)
498
499
500
501
502
  if result.failed:
    raise errors.OpExecError("Remote command on node %s, error: %s,"
                             " output: %s" %
                             (node, result.fail_reason, result.output))

503
504
  _WaitForNodeDaemon(node)

505

506
def MasterFailover(no_voting=False):
507
508
509
510
511
512
  """Failover the master node.

  This checks that we are not already the master, and will cause the
  current master to cease being master, and the non-master to become
  new master.

513
514
515
516
  @type no_voting: boolean
  @param no_voting: force the operation without remote nodes agreement
                      (dangerous)

517
  """
518
  sstore = ssconf.SimpleStore()
519

520
521
522
  old_master, new_master = ssconf.GetMasterAndMyself(sstore)
  node_list = sstore.GetNodeList()
  mc_list = sstore.GetMasterCandidates()
523
524
525
526
527

  if old_master == new_master:
    raise errors.OpPrereqError("This commands must be run on the node"
                               " where you want the new master to be."
                               " %s is already the master" %
528
                               old_master, errors.ECODE_INVAL)
529

530
531
532
533
534
535
  if new_master not in mc_list:
    mc_no_master = [name for name in mc_list if name != old_master]
    raise errors.OpPrereqError("This node is not among the nodes marked"
                               " as master candidates. Only these nodes"
                               " can become masters. Current list of"
                               " master candidates is:\n"
536
537
                               "%s" % ('\n'.join(mc_no_master)),
                               errors.ECODE_STATE)
538

539
540
541
542
543
544
545
  if not no_voting:
    vote_list = GatherMasterVotes(node_list)

    if vote_list:
      voted_master = vote_list[0][0]
      if voted_master is None:
        raise errors.OpPrereqError("Cluster is inconsistent, most nodes did"
546
                                   " not respond.", errors.ECODE_ENVIRON)
547
548
549
550
551
      elif voted_master != old_master:
        raise errors.OpPrereqError("I have a wrong configuration, I believe"
                                   " the master is %s but the other nodes"
                                   " voted %s. Please resync the configuration"
                                   " of this node." %
552
553
                                   (old_master, voted_master),
                                   errors.ECODE_STATE)
554
555
556
557
  # end checks

  rcode = 0

558
  logging.info("Setting master to %s, old master: %s", new_master, old_master)
559

560
  result = rpc.RpcRunner.call_node_stop_master(old_master, True)
561
  msg = result.fail_msg
562
  if msg:
563
    logging.error("Could not disable the master role on the old master"
564
                 " %s, please disable manually: %s", old_master, msg)
565

Michael Hanselmann's avatar
Michael Hanselmann committed
566
  # Here we have a phase where no master should be running
567

Iustin Pop's avatar
Iustin Pop committed
568
569
570
  # instantiate a real config writer, as we now know we have the
  # configuration data
  cfg = config.ConfigWriter()
571

Iustin Pop's avatar
Iustin Pop committed
572
573
574
575
  cluster_info = cfg.GetClusterInfo()
  cluster_info.master_node = new_master
  # this will also regenerate the ssconf files, since we updated the
  # cluster info
576
  cfg.Update(cluster_info, logging.error)
577

578
  result = rpc.RpcRunner.call_node_start_master(new_master, True, no_voting)
579
  msg = result.fail_msg
580
  if msg:
581
    logging.error("Could not start the master role on the new master"
582
                  " %s, please check: %s", new_master, msg)
583
584
585
    rcode = 1

  return rcode
586
587


588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
def GetMaster():
  """Returns the current master node.

  This is a separate function in bootstrap since it's needed by
  gnt-cluster, and instead of importing directly ssconf, it's better
  to abstract it in bootstrap, where we do use ssconf in other
  functions too.

  """
  sstore = ssconf.SimpleStore()

  old_master, _ = ssconf.GetMasterAndMyself(sstore)

  return old_master


604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
def GatherMasterVotes(node_list):
  """Check the agreement on who is the master.

  This function will return a list of (node, number of votes), ordered
  by the number of votes. Errors will be denoted by the key 'None'.

  Note that the sum of votes is the number of nodes this machine
  knows, whereas the number of entries in the list could be different
  (if some nodes vote for another master).

  We remove ourselves from the list since we know that (bugs aside)
  since we use the same source for configuration information for both
  backend and boostrap, we'll always vote for ourselves.

  @type node_list: list
  @param node_list: the list of nodes to query for master info; the current
Michael Hanselmann's avatar
Michael Hanselmann committed
620
      node will be removed if it is in the list
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
  @rtype: list
  @return: list of (node, votes)

  """
  myself = utils.HostInfo().name
  try:
    node_list.remove(myself)
  except ValueError:
    pass
  if not node_list:
    # no nodes left (eventually after removing myself)
    return []
  results = rpc.RpcRunner.call_master_info(node_list)
  if not isinstance(results, dict):
    # this should not happen (unless internal error in rpc)
    logging.critical("Can't complete rpc call, aborting master startup")
    return [(None, len(node_list))]
  votes = {}
  for node in results:
640
    nres = results[node]
641
    data = nres.payload
642
    msg = nres.fail_msg
643
644
645
646
647
648
649
650
    fail = False
    if msg:
      logging.warning("Error contacting node %s: %s", node, msg)
      fail = True
    elif not isinstance(data, (tuple, list)) or len(data) < 3:
      logging.warning("Invalid data received from node %s: %s", node, data)
      fail = True
    if fail:
651
652
653
654
      if None not in votes:
        votes[None] = 0
      votes[None] += 1
      continue
655
    master_node = data[2]
656
657
658
659
660
661
662
663
664
665
666
    if master_node not in votes:
      votes[master_node] = 0
    votes[master_node] += 1

  vote_list = [v for v in votes.items()]
  # sort first on number of votes then on name, since we want None
  # sorted later if we have the half of the nodes not responding, and
  # half voting all for the same master
  vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)

  return vote_list