bootstrap.py 27.4 KB
Newer Older
1 2 3
#
#

4
# Copyright (C) 2006, 2007, 2008, 2010 Google Inc.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
#
# 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 time
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 serializer
41
from ganeti import hypervisor
42
from ganeti import bdev
43
from ganeti import netutils
44
from ganeti import backend
45
from ganeti import luxi
46
from ganeti import jstore
47

48

49 50 51
# ec_id for InitConfig's temporary reservation manager
_INITCONF_ECID = "initconfig-ecid"

52 53 54
#: After how many seconds daemon must be responsive
_DAEMON_READY_TIMEOUT = 10.0

55

56
def _InitSSHSetup():
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76
  """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)

77
  utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
78 79


80 81 82 83 84 85 86
def GenerateHmacKey(file_name):
  """Writes a new HMAC key.

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

  """
87 88 89 90
  utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,
                  backup=True)


91
def GenerateClusterCrypto(new_cluster_cert, new_rapi_cert, new_confd_hmac_key,
Iustin Pop's avatar
Iustin Pop committed
92
                          new_cds, rapi_cert_pem=None, cds=None,
93 94
                          nodecert_file=constants.NODED_CERT_FILE,
                          rapicert_file=constants.RAPI_CERT_FILE,
95 96
                          hmackey_file=constants.CONFD_HMAC_KEY,
                          cds_file=constants.CLUSTER_DOMAIN_SECRET_FILE):
97 98 99 100 101 102
  """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
103 104
  @type new_confd_hmac_key: bool
  @param new_confd_hmac_key: Whether to generate a new HMAC key
Michael Hanselmann's avatar
Michael Hanselmann committed
105 106
  @type new_cds: bool
  @param new_cds: Whether to generate a new cluster domain secret
107 108
  @type rapi_cert_pem: string
  @param rapi_cert_pem: New RAPI certificate in PEM format
Michael Hanselmann's avatar
Michael Hanselmann committed
109 110
  @type cds: string
  @param cds: New cluster domain secret
111 112 113 114 115 116
  @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
117 118

  """
119
  # noded SSL certificate
120
  cluster_cert_exists = os.path.exists(nodecert_file)
121 122
  if new_cluster_cert or not cluster_cert_exists:
    if cluster_cert_exists:
123
      utils.CreateBackup(nodecert_file)
124

125
    logging.debug("Generating new cluster certificate at %s", nodecert_file)
Iustin Pop's avatar
Iustin Pop committed
126
    utils.GenerateSelfSignedSslCert(nodecert_file)
127

128
  # confd HMAC key
129 130 131
  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)
132 133

  # RAPI
134
  rapi_cert_exists = os.path.exists(rapicert_file)
135 136 137

  if rapi_cert_pem:
    # Assume rapi_pem contains a valid PEM-formatted certificate and key
138 139
    logging.debug("Writing RAPI certificate at %s", rapicert_file)
    utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)
140 141 142

  elif new_rapi_cert or not rapi_cert_exists:
    if rapi_cert_exists:
143
      utils.CreateBackup(rapicert_file)
144

145
    logging.debug("Generating new RAPI certificate at %s", rapicert_file)
Iustin Pop's avatar
Iustin Pop committed
146
    utils.GenerateSelfSignedSslCert(rapicert_file)
147

Michael Hanselmann's avatar
Michael Hanselmann committed
148 149
  # Cluster domain secret
  if cds:
150 151 152 153 154 155
    logging.debug("Writing cluster domain secret to %s", cds_file)
    utils.WriteFile(cds_file, data=cds, backup=True)

  elif new_cds or not os.path.exists(cds_file):
    logging.debug("Generating new cluster domain secret at %s", cds_file)
    GenerateHmacKey(cds_file)
Michael Hanselmann's avatar
Michael Hanselmann committed
156

157

158
def _InitGanetiServerSetup(master_name):
159 160 161
  """Setup the necessary configuration for the initial node daemon.

  This creates the nodepass file containing the shared password for
162 163 164 165
  the cluster, generates the SSL certificate and starts the node daemon.

  @type master_name: str
  @param master_name: Name of the master node
166 167

  """
168
  # Generate cluster secrets
Michael Hanselmann's avatar
Michael Hanselmann committed
169
  GenerateClusterCrypto(True, False, False, False)
170

171
  result = utils.RunCmd([constants.DAEMON_UTIL, "start", constants.NODED])
172 173 174 175 176
  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))

177 178 179 180 181 182 183
  _WaitForNodeDaemon(master_name)


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

  """
184
  def _CheckNodeDaemon():
185
    result = rpc.RpcRunner.call_version([node_name])[node_name]
186 187
    if result.fail_msg:
      raise utils.RetryAgain()
188

189
  try:
190
    utils.Retry(_CheckNodeDaemon, 1.0, _DAEMON_READY_TIMEOUT)
191
  except utils.RetryTimeout:
192
    raise errors.OpExecError("Node daemon on %s didn't answer queries within"
193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
                             " %s seconds" % (node_name, _DAEMON_READY_TIMEOUT))


def _WaitForMasterDaemon():
  """Wait for master daemon to become responsive.

  """
  def _CheckMasterDaemon():
    try:
      cl = luxi.Client()
      (cluster_name, ) = cl.QueryConfigValues(["cluster_name"])
    except Exception:
      raise utils.RetryAgain()

    logging.debug("Received cluster name %s from master", cluster_name)

  try:
    utils.Retry(_CheckMasterDaemon, 1.0, _DAEMON_READY_TIMEOUT)
  except utils.RetryTimeout:
    raise errors.OpExecError("Master daemon didn't answer queries within"
                             " %s seconds" % _DAEMON_READY_TIMEOUT)
214

215

216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247
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


248
def InitCluster(cluster_name, mac_prefix, # pylint: disable-msg=R0913
249
                master_netdev, file_storage_dir, candidate_pool_size,
250
                secondary_ip=None, vg_name=None, beparams=None,
251 252 253 254
                nicparams=None, ndparams=None, hvparams=None,
                enabled_hypervisors=None, modify_etc_hosts=True,
                modify_ssh_setup=True, maintain_node_health=False,
                drbd_helper=None, uid_pool=None, default_iallocator=None,
255
                primary_ip_version=None, prealloc_wipe_disks=False):
256 257
  """Initialise the cluster.

258 259 260
  @type candidate_pool_size: int
  @param candidate_pool_size: master candidate pool size

261
  """
262
  # TODO: complete the docstring
263
  if config.ConfigWriter.IsCluster():
264 265
    raise errors.OpPrereqError("Cluster is already initialised",
                               errors.ECODE_STATE)
266

267 268
  if not enabled_hypervisors:
    raise errors.OpPrereqError("Enabled hypervisors list must contain at"
269
                               " least one member", errors.ECODE_INVAL)
270 271 272
  invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES
  if invalid_hvs:
    raise errors.OpPrereqError("Enabled hypervisors contains invalid"
273 274
                               " entries: %s" % invalid_hvs,
                               errors.ECODE_INVAL)
275

276

277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
  ipcls = None
  if primary_ip_version == constants.IP4_VERSION:
    ipcls = netutils.IP4Address
  elif primary_ip_version == constants.IP6_VERSION:
    ipcls = netutils.IP6Address
  else:
    raise errors.OpPrereqError("Invalid primary ip version: %d." %
                               primary_ip_version)

  hostname = netutils.GetHostname(family=ipcls.family)
  if not ipcls.IsValid(hostname.ip):
    raise errors.OpPrereqError("This host's IP (%s) is not a valid IPv%d"
                               " address." % (hostname.ip, primary_ip_version))

  if ipcls.IsLoopback(hostname.ip):
292 293
    raise errors.OpPrereqError("This host's IP (%s) resolves to a loopback"
                               " address. Please fix DNS or %s." %
294 295
                               (hostname.ip, constants.ETC_HOSTS),
                               errors.ECODE_ENVIRON)
296

297
  if not ipcls.Own(hostname.ip):
298 299
    raise errors.OpPrereqError("Inconsistency: this host's name resolves"
                               " to %s,\nbut this ip address does not"
300
                               " belong to this host" %
301
                               hostname.ip, errors.ECODE_ENVIRON)
302

303
  clustername = netutils.GetHostname(name=cluster_name, family=ipcls.family)
304

305
  if netutils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT, timeout=5):
306
    raise errors.OpPrereqError("Cluster IP already active",
307
                               errors.ECODE_NOTUNIQUE)
308

309 310 311
  if not secondary_ip:
    if primary_ip_version == constants.IP6_VERSION:
      raise errors.OpPrereqError("When using a IPv6 primary address, a valid"
312 313
                                 " IPv4 address must be given as secondary",
                                 errors.ECODE_INVAL)
314
    secondary_ip = hostname.ip
315

316 317 318 319 320 321 322 323 324 325
  if not netutils.IP4Address.IsValid(secondary_ip):
    raise errors.OpPrereqError("Secondary IP address (%s) has to be a valid"
                               " IPv4 address." % secondary_ip,
                               errors.ECODE_INVAL)

  if not netutils.IP4Address.Own(secondary_ip):
    raise errors.OpPrereqError("You gave %s as secondary IP,"
                               " but it does not belong to this host." %
                               secondary_ip, errors.ECODE_ENVIRON)

326 327 328 329 330 331
  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"
332 333
                                 " you are not using lvm" % vgstatus,
                                 errors.ECODE_INVAL)
334

335 336 337 338 339 340 341 342 343 344 345 346 347 348
  if drbd_helper is not None:
    try:
      curr_helper = bdev.BaseDRBD.GetUsermodeHelper()
    except errors.BlockDeviceError, err:
      raise errors.OpPrereqError("Error while checking drbd helper"
                                 " (specify --no-drbd-storage if you are not"
                                 " using drbd): %s" % str(err),
                                 errors.ECODE_ENVIRON)
    if drbd_helper != curr_helper:
      raise errors.OpPrereqError("Error: requiring %s as drbd helper but %s"
                                 " is the current helper" % (drbd_helper,
                                                             curr_helper),
                                 errors.ECODE_INVAL)

349
  file_storage_dir = _InitFileStorage(file_storage_dir)
350 351

  if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
352 353
    raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,
                               errors.ECODE_INVAL)
354 355 356 357 358

  result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
  if result.failed:
    raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
                               (master_netdev,
359
                                result.output.strip()), errors.ECODE_INVAL)
360

361 362 363
  dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
  utils.EnsureDirs(dirs)

364
  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
365 366 367
  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
  objects.NIC.CheckParameterSyntax(nicparams)

368 369 370 371 372
  if ndparams is not None:
    utils.ForceDictType(ndparams, constants.NDS_PARAMETER_TYPES)
  else:
    ndparams = dict(constants.NDC_DEFAULTS)

373 374 375 376 377
  # 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)
378

379
  # set up ssh config and /etc/hosts
380
  sshline = utils.ReadFile(constants.SSH_HOST_RSA_PUB)
381 382
  sshkey = sshline.split(" ")[1]

383
  if modify_etc_hosts:
384
    utils.AddHostToEtcHosts(hostname.name, hostname.ip)
385

386 387
  if modify_ssh_setup:
    _InitSSHSetup()
388

389 390 391 392 393 394 395 396 397
  if default_iallocator is not None:
    alloc_script = utils.FindFile(default_iallocator,
                                  constants.IALLOCATOR_SEARCH_PATH,
                                  os.path.isfile)
    if alloc_script is None:
      raise errors.OpPrereqError("Invalid default iallocator script '%s'"
                                 " specified" % default_iallocator,
                                 errors.ECODE_INVAL)

398 399
  now = time.time()

400
  # init of cluster config file
401 402 403 404 405 406 407
  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(),
408 409 410 411 412
    master_node=hostname.name,
    master_ip=clustername.ip,
    master_netdev=master_netdev,
    cluster_name=clustername.name,
    file_storage_dir=file_storage_dir,
413
    enabled_hypervisors=enabled_hypervisors,
414
    beparams={constants.PP_DEFAULT: beparams},
415
    nicparams={constants.PP_DEFAULT: nicparams},
416
    ndparams=ndparams,
417
    hvparams=hvparams,
418
    candidate_pool_size=candidate_pool_size,
Guido Trotter's avatar
Guido Trotter committed
419
    modify_etc_hosts=modify_etc_hosts,
420
    modify_ssh_setup=modify_ssh_setup,
421
    uid_pool=uid_pool,
422 423
    ctime=now,
    mtime=now,
424
    maintain_node_health=maintain_node_health,
425
    drbd_usermode_helper=drbd_helper,
426
    default_iallocator=default_iallocator,
427
    primary_ip_family=ipcls.family,
428
    prealloc_wipe_disks=prealloc_wipe_disks,
429 430 431
    )
  master_node_config = objects.Node(name=hostname.name,
                                    primary_ip=hostname.ip,
432
                                    secondary_ip=secondary_ip,
433 434
                                    serial_no=1,
                                    master_candidate=True,
435
                                    offline=False, drained=False,
436
                                    ctime=now, mtime=now,
437
                                    )
438
  InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)
439
  cfg = config.ConfigWriter(offline=True)
440
  ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
441
  cfg.Update(cfg.GetClusterInfo(), logging.error)
442 443 444 445
  backend.WriteSsconfFiles(cfg.GetSsconfValues())

  # set up the inter-node password and certificate
  _InitGanetiServerSetup(hostname.name)
446

447 448 449 450 451 452
  logging.debug("Starting daemons")
  result = utils.RunCmd([constants.DAEMON_UTIL, "start-all"])
  if result.failed:
    raise errors.OpExecError("Could not start daemons, command %s"
                             " had exitcode %s and error %s" %
                             (result.cmd, result.exit_code, result.output))
Iustin Pop's avatar
Iustin Pop committed
453

454
  _WaitForMasterDaemon()
Iustin Pop's avatar
Iustin Pop committed
455

456

Oleksiy Mishchenko's avatar
Oleksiy Mishchenko committed
457 458
def InitConfig(version, cluster_config, master_node_config,
               cfg_file=constants.CLUSTER_CONF_FILE):
Iustin Pop's avatar
Iustin Pop committed
459 460 461 462 463 464
  """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
465 466 467 468 469 470 471 472
  @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
473
  """
474 475 476 477 478
  uuid_generator = config.TemporaryReservationManager()
  cluster_config.uuid = uuid_generator.Generate([], utils.NewUUID,
                                                _INITCONF_ECID)
  master_node_config.uuid = uuid_generator.Generate([], utils.NewUUID,
                                                    _INITCONF_ECID)
Iustin Pop's avatar
Iustin Pop committed
479 480 481
  nodes = {
    master_node_config.name: master_node_config,
    }
482 483
  default_nodegroup = objects.NodeGroup(
    uuid=uuid_generator.Generate([], utils.NewUUID, _INITCONF_ECID),
484
    name=constants.INITIAL_NODE_GROUP_NAME,
485 486 487 488 489
    members=[master_node_config.name],
    )
  nodegroups = {
    default_nodegroup.uuid: default_nodegroup,
    }
490
  now = time.time()
Iustin Pop's avatar
Iustin Pop committed
491 492
  config_data = objects.ConfigData(version=version,
                                   cluster=cluster_config,
493
                                   nodegroups=nodegroups,
Iustin Pop's avatar
Iustin Pop committed
494 495
                                   nodes=nodes,
                                   instances={},
496 497
                                   serial_no=1,
                                   ctime=now, mtime=now)
498 499 500
  utils.WriteFile(cfg_file,
                  data=serializer.Dump(config_data.ToDict()),
                  mode=0600)
Oleksiy Mishchenko's avatar
Oleksiy Mishchenko committed
501 502


Iustin Pop's avatar
Iustin Pop committed
503 504 505 506 507 508 509
def FinalizeClusterDestroy(master):
  """Execute the last steps of cluster destroy

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

  """
510 511
  cfg = config.ConfigWriter()
  modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
512
  result = rpc.RpcRunner.call_node_stop_master(master, True)
513
  msg = result.fail_msg
514
  if msg:
515
    logging.warning("Could not disable the master role: %s", msg)
516
  result = rpc.RpcRunner.call_node_leave_cluster(master, modify_ssh_setup)
517
  msg = result.fail_msg
518 519 520
  if msg:
    logging.warning("Could not shutdown the node daemon and cleanup"
                    " the node: %s", msg)
Iustin Pop's avatar
Iustin Pop committed
521 522


Iustin Pop's avatar
Iustin Pop committed
523
def SetupNodeDaemon(cluster_name, node, ssh_key_check):
524 525
  """Add a node to the cluster.

526 527 528
  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.
529

Iustin Pop's avatar
Iustin Pop committed
530 531 532
  @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
533 534

  """
Manuel Franceschini's avatar
Manuel Franceschini committed
535 536
  family = ssconf.SimpleStore().GetPrimaryIPFamily()
  sshrunner = ssh.SshRunner(cluster_name,
537
                            ipv6=(family == netutils.IP6Address.family))
538

Manuel Franceschini's avatar
Manuel Franceschini committed
539 540 541 542
  bind_address = constants.IP4_ADDRESS_ANY
  if family == netutils.IP6Address.family:
    bind_address = constants.IP6_ADDRESS_ANY

543 544 545 546
  # 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
547 548 549
  sshrunner.CopyFileToNode(node, constants.NODED_CERT_FILE)
  sshrunner.CopyFileToNode(node, constants.RAPI_CERT_FILE)
  sshrunner.CopyFileToNode(node, constants.CONFD_HMAC_KEY)
550 551 552
  mycommand = ("%s stop-all; %s start %s -b %s" %
               (constants.DAEMON_UTIL, constants.DAEMON_UTIL, constants.NODED,
                utils.ShellQuote(bind_address)))
553

554 555
  result = sshrunner.Run(node, 'root', mycommand, batch=False,
                         ask_key=ssh_key_check,
556
                         use_cluster_key=True,
557
                         strict_host_check=ssh_key_check)
558 559 560 561 562
  if result.failed:
    raise errors.OpExecError("Remote command on node %s, error: %s,"
                             " output: %s" %
                             (node, result.fail_reason, result.output))

563 564
  _WaitForNodeDaemon(node)

565

566
def MasterFailover(no_voting=False):
567 568 569 570 571 572
  """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.

573 574 575 576
  @type no_voting: boolean
  @param no_voting: force the operation without remote nodes agreement
                      (dangerous)

577
  """
578
  sstore = ssconf.SimpleStore()
579

580 581 582
  old_master, new_master = ssconf.GetMasterAndMyself(sstore)
  node_list = sstore.GetNodeList()
  mc_list = sstore.GetMasterCandidates()
583 584 585 586 587

  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" %
588
                               old_master, errors.ECODE_INVAL)
589

590 591 592 593 594 595
  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"
596 597
                               "%s" % ('\n'.join(mc_no_master)),
                               errors.ECODE_STATE)
598

599 600 601 602 603 604 605
  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"
606
                                   " not respond.", errors.ECODE_ENVIRON)
607 608 609 610 611
      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." %
612 613
                                   (old_master, voted_master),
                                   errors.ECODE_STATE)
614 615 616 617
  # end checks

  rcode = 0

618
  logging.info("Setting master to %s, old master: %s", new_master, old_master)
619

620 621 622
  try:
    # instantiate a real config writer, as we now know we have the
    # configuration data
623
    cfg = config.ConfigWriter(accept_foreign=True)
624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641

    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, logging.error)
  except errors.ConfigurationError, err:
    logging.error("Error while trying to set the new master: %s",
                  str(err))
    return 1

  # if cfg.Update worked, then it means the old master daemon won't be
  # able now to write its own config file (we rely on locking in both
  # backend.UploadFile() and ConfigWriter._Write(); hence the next
  # step is to kill the old master

  logging.info("Stopping the master daemon on node %s", old_master)

642
  result = rpc.RpcRunner.call_node_stop_master(old_master, True)
643
  msg = result.fail_msg
644
  if msg:
645
    logging.error("Could not disable the master role on the old master"
646
                 " %s, please disable manually: %s", old_master, msg)
647

648 649
  logging.info("Checking master IP non-reachability...")

Iustin Pop's avatar
Iustin Pop committed
650 651
  master_ip = sstore.GetMasterIP()
  total_timeout = 30
Michael Hanselmann's avatar
Michael Hanselmann committed
652
  # Here we have a phase where no master should be running
Iustin Pop's avatar
Iustin Pop committed
653
  def _check_ip():
654
    if netutils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
Iustin Pop's avatar
Iustin Pop committed
655 656 657 658 659 660 661 662
      raise utils.RetryAgain()

  try:
    utils.Retry(_check_ip, (1, 1.5, 5), total_timeout)
  except utils.RetryTimeout:
    logging.warning("The master IP is still reachable after %s seconds,"
                    " continuing but activating the master on the current"
                    " node will probably fail", total_timeout)
663

664 665 666 667
  if jstore.CheckDrainFlag():
    logging.info("Undraining job queue")
    jstore.SetDrainFlag(False)

668
  logging.info("Starting the master daemons on the new master")
669

670
  result = rpc.RpcRunner.call_node_start_master(new_master, True, no_voting)
671
  msg = result.fail_msg
672
  if msg:
673
    logging.error("Could not start the master role on the new master"
674
                  " %s, please check: %s", new_master, msg)
675 676
    rcode = 1

677
  logging.info("Master failed over from %s to %s", old_master, new_master)
678
  return rcode
679 680


681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
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


697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
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
713
      node will be removed if it is in the list
714 715 716 717
  @rtype: list
  @return: list of (node, votes)

  """
718
  myself = netutils.Hostname.GetSysName()
719 720 721 722 723 724 725 726 727 728 729 730 731 732
  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:
733
    nres = results[node]
734
    data = nres.payload
735
    msg = nres.fail_msg
736 737 738 739
    fail = False
    if msg:
      logging.warning("Error contacting node %s: %s", node, msg)
      fail = True
740
    # for now we accept both length 3 and 4 (data[3] is primary ip version)
741 742 743 744
    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:
745 746 747 748
      if None not in votes:
        votes[None] = 0
      votes[None] += 1
      continue
749
    master_node = data[2]
750 751 752 753 754 755 756 757 758 759 760
    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