bootstrap.py 18.2 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
32
33
34
35
36
37

from ganeti import rpc
from ganeti import ssh
from ganeti import utils
from ganeti import errors
from ganeti import config
from ganeti import constants
38
from ganeti import objects
39
from ganeti import ssconf
40
from ganeti import hypervisor
41

42

43
def _InitSSHSetup():
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
  """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)

  f = open(pub_key, 'r')
  try:
    utils.AddAuthorizedKey(auth_keys, f.read(8192))
  finally:
    f.close()


71
72
def _GenerateSelfSignedSslCert(file_name, validity=(365 * 5)):
  """Generates a self-signed SSL certificate.
73

74
75
76
77
  @type file_name: str
  @param file_name: Path to output file
  @type validity: int
  @param validity: Validity for certificate in days
78
79

  """
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
  (fd, tmp_file_name) = tempfile.mkstemp(dir=os.path.dirname(file_name))
  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)
100
101
102
103
104
105
106
107
108
109


def _InitGanetiServerSetup():
  """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.

  """
  _GenerateSelfSignedSslCert(constants.SSL_CERT_FILE)
110

111
112
113
114
  # Don't overwrite existing file
  if not os.path.exists(constants.RAPI_CERT_FILE):
    _GenerateSelfSignedSslCert(constants.RAPI_CERT_FILE)

115
116
117
118
119
120
121
122
  result = utils.RunCmd([constants.NODE_INITD_SCRIPT, "restart"])

  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))


123
def InitCluster(cluster_name, mac_prefix,
124
                master_netdev, file_storage_dir, candidate_pool_size,
125
126
127
                secondary_ip=None, vg_name=None, beparams=None,
                nicparams=None, hvparams=None, enabled_hypervisors=None,
                default_hypervisor=None, modify_etc_hosts=True):
128
129
  """Initialise the cluster.

130
131
132
  @type candidate_pool_size: int
  @param candidate_pool_size: master candidate pool size

133
  """
134
  # TODO: complete the docstring
135
136
137
138
139
140
141
142
143
144
  if config.ConfigWriter.IsCluster():
    raise errors.OpPrereqError("Cluster is already initialised")

  hostname = utils.HostInfo()

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

145
  if not utils.OwnIpAddress(hostname.ip):
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
    raise errors.OpPrereqError("Inconsistency: this host's name resolves"
                               " to %s,\nbut this ip address does not"
                               " belong to this host."
                               " Aborting." % hostname.ip)

  clustername = utils.HostInfo(cluster_name)

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

  if secondary_ip:
    if not utils.IsValidIP(secondary_ip):
      raise errors.OpPrereqError("Invalid secondary ip given")
    if (secondary_ip != hostname.ip and
161
        not utils.OwnIpAddress(secondary_ip)):
162
163
164
      raise errors.OpPrereqError("You gave %s as secondary IP,"
                                 " but it does not belong to this host." %
                                 secondary_ip)
165
166
  else:
    secondary_ip = hostname.ip
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207

  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"
                                 " you are not using lvm" % vgstatus)

  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.")

  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))

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

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

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

  if not (os.path.isfile(constants.NODE_INITD_SCRIPT) and
          os.access(constants.NODE_INITD_SCRIPT, os.X_OK)):
    raise errors.OpPrereqError("Init.d script '%s' missing or not"
                               " executable." % constants.NODE_INITD_SCRIPT)

208
209
210
  dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
  utils.EnsureDirs(dirs)

211
  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
212
213
214
  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
  objects.NIC.CheckParameterSyntax(nicparams)

215
216
217
218
219
  # 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)
220

221
  # set up the inter-node password and certificate
Michael Hanselmann's avatar
Michael Hanselmann committed
222
  _InitGanetiServerSetup()
223
224
225
226
227
228
229
230
231

  # set up ssh config and /etc/hosts
  f = open(constants.SSH_HOST_RSA_PUB, 'r')
  try:
    sshline = f.read()
  finally:
    f.close()
  sshkey = sshline.split(" ")[1]

232
233
234
  if modify_etc_hosts:
    utils.AddHostToEtcHosts(hostname.name)

235
  _InitSSHSetup()
236
237

  # init of cluster config file
238
239
240
241
242
243
244
  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(),
245
246
247
248
249
    master_node=hostname.name,
    master_ip=clustername.ip,
    master_netdev=master_netdev,
    cluster_name=clustername.name,
    file_storage_dir=file_storage_dir,
250
    enabled_hypervisors=enabled_hypervisors,
251
    default_hypervisor=default_hypervisor,
252
    beparams={constants.PP_DEFAULT: beparams},
253
    nicparams={constants.PP_DEFAULT: nicparams},
254
    hvparams=hvparams,
255
    candidate_pool_size=candidate_pool_size,
Guido Trotter's avatar
Guido Trotter committed
256
    modify_etc_hosts=modify_etc_hosts,
257
258
259
    )
  master_node_config = objects.Node(name=hostname.name,
                                    primary_ip=hostname.ip,
260
                                    secondary_ip=secondary_ip,
261
262
                                    serial_no=1,
                                    master_candidate=True,
263
                                    offline=False, drained=False,
264
                                    )
265

266
267
268
269
270
  sscfg = InitConfig(constants.CONFIG_VERSION,
                     cluster_config, master_node_config)
  ssh.WriteKnownHostsFile(sscfg, constants.SSH_KNOWN_HOSTS_FILE)
  cfg = config.ConfigWriter()
  cfg.Update(cfg.GetClusterInfo())
271

Iustin Pop's avatar
Iustin Pop committed
272
273
  # start the master ip
  # TODO: Review rpc call from bootstrap
274
  # TODO: Warn on failed start master
275
  rpc.RpcRunner.call_node_start_master(hostname.name, True)
Iustin Pop's avatar
Iustin Pop committed
276

277

Oleksiy Mishchenko's avatar
Oleksiy Mishchenko committed
278
279
def InitConfig(version, cluster_config, master_node_config,
               cfg_file=constants.CLUSTER_CONF_FILE):
Iustin Pop's avatar
Iustin Pop committed
280
281
282
283
284
285
  """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
286
287
288
289
290
291
292
293
294
  @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

  @rtype: L{ssconf.SimpleConfigWriter}
Iustin Pop's avatar
Iustin Pop committed
295
  @return: initialized config instance
Iustin Pop's avatar
Iustin Pop committed
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310

  """
  nodes = {
    master_node_config.name: master_node_config,
    }

  config_data = objects.ConfigData(version=version,
                                   cluster=cluster_config,
                                   nodes=nodes,
                                   instances={},
                                   serial_no=1)
  cfg = ssconf.SimpleConfigWriter.FromDict(config_data.ToDict(), cfg_file)
  cfg.Save()

  return cfg
Oleksiy Mishchenko's avatar
Oleksiy Mishchenko committed
311
312


Iustin Pop's avatar
Iustin Pop committed
313
314
315
316
317
318
319
def FinalizeClusterDestroy(master):
  """Execute the last steps of cluster destroy

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

  """
320
  result = rpc.RpcRunner.call_node_stop_master(master, True)
321
322
323
  msg = result.RemoteFailMsg()
  if msg:
    logging.warning("Could not disable the master role: %s" % msg)
324
325
  result = rpc.RpcRunner.call_node_leave_cluster(master)
  if result.failed or not result.data:
Iustin Pop's avatar
Iustin Pop committed
326
327
328
    logging.warning("Could not shutdown the node daemon and cleanup the node")


Iustin Pop's avatar
Iustin Pop committed
329
def SetupNodeDaemon(cluster_name, node, ssh_key_check):
330
331
  """Add a node to the cluster.

332
333
334
  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.
335

Iustin Pop's avatar
Iustin Pop committed
336
337
338
  @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
339
340

  """
Iustin Pop's avatar
Iustin Pop committed
341
  sshrunner = ssh.SshRunner(cluster_name)
342
343

  noded_cert = utils.ReadFile(constants.SSL_CERT_FILE)
344
  rapi_cert = utils.ReadFile(constants.RAPI_CERT_FILE)
345

346
347
348
349
  # 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
  # parsed by the shell sequence below
350
351
  if (re.search('^!EOF\.', noded_cert, re.MULTILINE) or
      re.search('^!EOF\.', rapi_cert, re.MULTILINE)):
352
    raise errors.OpExecError("invalid PEM encoding in the SSL certificate")
353
354
355

  if not noded_cert.endswith("\n"):
    noded_cert += "\n"
356
357
  if not rapi_cert.endswith("\n"):
    rapi_cert += "\n"
358
359
360
361
362
363
364

  # 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"
365
366
367
               "%s!EOF.\n"
               "cat > '%s' << '!EOF.' && \n"
               "%s!EOF.\n"
368
               "chmod 0400 %s %s && "
369
               "%s restart" %
370
               (constants.SSL_CERT_FILE, noded_cert,
371
                constants.RAPI_CERT_FILE, rapi_cert,
372
                constants.SSL_CERT_FILE, constants.RAPI_CERT_FILE,
373
374
                constants.NODE_INITD_SCRIPT))

375
376
377
378
  result = sshrunner.Run(node, 'root', mycommand, batch=False,
                         ask_key=ssh_key_check,
                         use_cluster_key=False,
                         strict_host_check=ssh_key_check)
379
380
381
382
383
  if result.failed:
    raise errors.OpExecError("Remote command on node %s, error: %s,"
                             " output: %s" %
                             (node, result.fail_reason, result.output))

384
385
386
387
388
389
390
391
392

def MasterFailover():
  """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.

  """
393
  sstore = ssconf.SimpleStore()
394

395
396
397
  old_master, new_master = ssconf.GetMasterAndMyself(sstore)
  node_list = sstore.GetNodeList()
  mc_list = sstore.GetMasterCandidates()
398
399
400
401
402
403

  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" %
                               old_master)
404

405
406
407
408
409
410
411
412
  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"
                               "%s" % ('\n'.join(mc_no_master)))

413
414
415
416
417
418
419
420
421
422
423
424
  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 not"
                                 " respond.")
    elif voted_master != old_master:
      raise errors.OpPrereqError("I have wrong configuration, I believe the"
                                 " master is %s but the other nodes voted for"
                                 " %s. Please resync the configuration of"
                                 " this node." % (old_master, voted_master))
425
426
427
428
  # end checks

  rcode = 0

429
  logging.info("Setting master to %s, old master: %s", new_master, old_master)
430

431
  result = rpc.RpcRunner.call_node_stop_master(old_master, True)
432
433
  msg = result.RemoteFailMsg()
  if msg:
434
    logging.error("Could not disable the master role on the old master"
435
                 " %s, please disable manually: %s", old_master, msg)
436

Michael Hanselmann's avatar
Michael Hanselmann committed
437
  # Here we have a phase where no master should be running
438

Iustin Pop's avatar
Iustin Pop committed
439
440
441
  # instantiate a real config writer, as we now know we have the
  # configuration data
  cfg = config.ConfigWriter()
442

Iustin Pop's avatar
Iustin Pop committed
443
444
445
446
447
  cluster_info = cfg.GetClusterInfo()
  cluster_info.master_node = new_master
  # this will also regenerate the ssconf files, since we updated the
  # cluster info
  cfg.Update(cluster_info)
448

449
  result = rpc.RpcRunner.call_node_start_master(new_master, True)
450
451
  msg = result.RemoteFailMsg()
  if msg:
452
    logging.error("Could not start the master role on the new master"
453
                  " %s, please check: %s", new_master, msg)
454
455
456
    rcode = 1

  return rcode
457
458


459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
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


475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
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
      node wil be removed if it is in the list
  @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:
511
512
513
    nres = results[node]
    data = nres.data
    if nres.failed or not isinstance(data, (tuple, list)) or len(data) < 3:
514
515
516
517
518
      # here the rpc layer should have already logged errors
      if None not in votes:
        votes[None] = 0
      votes[None] += 1
      continue
519
    master_node = data[2]
520
521
522
523
524
525
526
527
528
529
530
    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