4 # Copyright (C) 2006, 2007, 2008, 2010 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 """Functions to bootstrap a new cluster.
32 from ganeti import rpc
33 from ganeti import ssh
34 from ganeti import utils
35 from ganeti import errors
36 from ganeti import config
37 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
49 # ec_id for InitConfig's temporary reservation manager
50 _INITCONF_ECID = "initconfig-ecid"
52 #: After how many seconds daemon must be responsive
53 _DAEMON_READY_TIMEOUT = 10.0
57 """Setup the SSH configuration for the cluster.
59 This generates a dsa keypair for root, adds the pub key to the
60 permitted hosts and adds the hostkey to its own known hosts.
63 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
65 for name in priv_key, pub_key:
66 if os.path.exists(name):
67 utils.CreateBackup(name)
68 utils.RemoveFile(name)
70 result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
74 raise errors.OpExecError("Could not generate ssh keypair, error %s" %
77 utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
80 def GenerateHmacKey(file_name):
81 """Writes a new HMAC key.
84 @param file_name: Path to output file
87 utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,
91 def GenerateClusterCrypto(new_cluster_cert, new_rapi_cert, new_confd_hmac_key,
92 new_cds, rapi_cert_pem=None, cds=None,
93 nodecert_file=constants.NODED_CERT_FILE,
94 rapicert_file=constants.RAPI_CERT_FILE,
95 hmackey_file=constants.CONFD_HMAC_KEY,
96 cds_file=constants.CLUSTER_DOMAIN_SECRET_FILE):
97 """Updates the cluster certificates, keys and secrets.
99 @type new_cluster_cert: bool
100 @param new_cluster_cert: Whether to generate a new cluster certificate
101 @type new_rapi_cert: bool
102 @param new_rapi_cert: Whether to generate a new RAPI certificate
103 @type new_confd_hmac_key: bool
104 @param new_confd_hmac_key: Whether to generate a new HMAC key
106 @param new_cds: Whether to generate a new cluster domain secret
107 @type rapi_cert_pem: string
108 @param rapi_cert_pem: New RAPI certificate in PEM format
110 @param cds: New cluster domain secret
111 @type nodecert_file: string
112 @param nodecert_file: optional override of the node cert file path
113 @type rapicert_file: string
114 @param rapicert_file: optional override of the rapi cert file path
115 @type hmackey_file: string
116 @param hmackey_file: optional override of the hmac key file path
119 # noded SSL certificate
120 cluster_cert_exists = os.path.exists(nodecert_file)
121 if new_cluster_cert or not cluster_cert_exists:
122 if cluster_cert_exists:
123 utils.CreateBackup(nodecert_file)
125 logging.debug("Generating new cluster certificate at %s", nodecert_file)
126 utils.GenerateSelfSignedSslCert(nodecert_file)
129 if new_confd_hmac_key or not os.path.exists(hmackey_file):
130 logging.debug("Writing new confd HMAC key to %s", hmackey_file)
131 GenerateHmacKey(hmackey_file)
134 rapi_cert_exists = os.path.exists(rapicert_file)
137 # Assume rapi_pem contains a valid PEM-formatted certificate and key
138 logging.debug("Writing RAPI certificate at %s", rapicert_file)
139 utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)
141 elif new_rapi_cert or not rapi_cert_exists:
143 utils.CreateBackup(rapicert_file)
145 logging.debug("Generating new RAPI certificate at %s", rapicert_file)
146 utils.GenerateSelfSignedSslCert(rapicert_file)
148 # Cluster domain secret
150 logging.debug("Writing cluster domain secret to %s", cds_file)
151 utils.WriteFile(cds_file, data=cds, backup=True)
153 elif new_cds or not os.path.exists(cds_file):
154 logging.debug("Generating new cluster domain secret at %s", cds_file)
155 GenerateHmacKey(cds_file)
158 def _InitGanetiServerSetup(master_name):
159 """Setup the necessary configuration for the initial node daemon.
161 This creates the nodepass file containing the shared password for
162 the cluster, generates the SSL certificate and starts the node daemon.
164 @type master_name: str
165 @param master_name: Name of the master node
168 # Generate cluster secrets
169 GenerateClusterCrypto(True, False, False, False)
171 result = utils.RunCmd([constants.DAEMON_UTIL, "start", constants.NODED])
173 raise errors.OpExecError("Could not start the node daemon, command %s"
174 " had exitcode %s and error %s" %
175 (result.cmd, result.exit_code, result.output))
177 _WaitForNodeDaemon(master_name)
180 def _WaitForNodeDaemon(node_name):
181 """Wait for node daemon to become responsive.
184 def _CheckNodeDaemon():
185 result = rpc.RpcRunner.call_version([node_name])[node_name]
187 raise utils.RetryAgain()
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 " %s seconds" % (node_name, _DAEMON_READY_TIMEOUT))
196 def _WaitForMasterDaemon():
197 """Wait for master daemon to become responsive.
200 def _CheckMasterDaemon():
203 (cluster_name, ) = cl.QueryConfigValues(["cluster_name"])
205 raise utils.RetryAgain()
207 logging.debug("Received cluster name %s from master", cluster_name)
210 utils.Retry(_CheckMasterDaemon, 1.0, _DAEMON_READY_TIMEOUT)
211 except utils.RetryTimeout:
212 raise errors.OpExecError("Master daemon didn't answer queries within"
213 " %s seconds" % _DAEMON_READY_TIMEOUT)
216 def _InitFileStorage(file_storage_dir):
217 """Initialize if needed the file storage.
219 @param file_storage_dir: the user-supplied value
220 @return: either empty string (if file storage was disabled at build
221 time) or the normalized path to the storage directory
224 if not constants.ENABLE_FILE_STORAGE:
227 file_storage_dir = os.path.normpath(file_storage_dir)
229 if not os.path.isabs(file_storage_dir):
230 raise errors.OpPrereqError("The file storage directory you passed is"
231 " not an absolute path.", errors.ECODE_INVAL)
233 if not os.path.exists(file_storage_dir):
235 os.makedirs(file_storage_dir, 0750)
237 raise errors.OpPrereqError("Cannot create file storage directory"
238 " '%s': %s" % (file_storage_dir, err),
239 errors.ECODE_ENVIRON)
241 if not os.path.isdir(file_storage_dir):
242 raise errors.OpPrereqError("The file storage directory '%s' is not"
243 " a directory." % file_storage_dir,
244 errors.ECODE_ENVIRON)
245 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 nicparams=None, ndparams=None, hvparams=None,
252 enabled_hypervisors=None, modify_etc_hosts=True,
253 modify_ssh_setup=True, maintain_node_health=False,
254 drbd_helper=None, uid_pool=None, default_iallocator=None,
255 primary_ip_version=None, prealloc_wipe_disks=False):
256 """Initialise the cluster.
258 @type candidate_pool_size: int
259 @param candidate_pool_size: master candidate pool size
262 # TODO: complete the docstring
263 if config.ConfigWriter.IsCluster():
264 raise errors.OpPrereqError("Cluster is already initialised",
267 if not enabled_hypervisors:
268 raise errors.OpPrereqError("Enabled hypervisors list must contain at"
269 " least one member", errors.ECODE_INVAL)
270 invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES
272 raise errors.OpPrereqError("Enabled hypervisors contains invalid"
273 " entries: %s" % invalid_hvs,
278 if primary_ip_version == constants.IP4_VERSION:
279 ipcls = netutils.IP4Address
280 elif primary_ip_version == constants.IP6_VERSION:
281 ipcls = netutils.IP6Address
283 raise errors.OpPrereqError("Invalid primary ip version: %d." %
286 hostname = netutils.GetHostname(family=ipcls.family)
287 if not ipcls.IsValid(hostname.ip):
288 raise errors.OpPrereqError("This host's IP (%s) is not a valid IPv%d"
289 " address." % (hostname.ip, primary_ip_version))
291 if ipcls.IsLoopback(hostname.ip):
292 raise errors.OpPrereqError("This host's IP (%s) resolves to a loopback"
293 " address. Please fix DNS or %s." %
294 (hostname.ip, constants.ETC_HOSTS),
295 errors.ECODE_ENVIRON)
297 if not ipcls.Own(hostname.ip):
298 raise errors.OpPrereqError("Inconsistency: this host's name resolves"
299 " to %s,\nbut this ip address does not"
300 " belong to this host" %
301 hostname.ip, errors.ECODE_ENVIRON)
303 clustername = netutils.GetHostname(name=cluster_name, family=ipcls.family)
305 if netutils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT, timeout=5):
306 raise errors.OpPrereqError("Cluster IP already active",
307 errors.ECODE_NOTUNIQUE)
310 if primary_ip_version == constants.IP6_VERSION:
311 raise errors.OpPrereqError("When using a IPv6 primary address, a valid"
312 " IPv4 address must be given as secondary",
314 secondary_ip = hostname.ip
316 if not netutils.IP4Address.IsValid(secondary_ip):
317 raise errors.OpPrereqError("Secondary IP address (%s) has to be a valid"
318 " IPv4 address." % secondary_ip,
321 if not netutils.IP4Address.Own(secondary_ip):
322 raise errors.OpPrereqError("You gave %s as secondary IP,"
323 " but it does not belong to this host." %
324 secondary_ip, errors.ECODE_ENVIRON)
326 if vg_name is not None:
327 # Check if volume group is valid
328 vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
329 constants.MIN_VG_SIZE)
331 raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
332 " you are not using lvm" % vgstatus,
335 if drbd_helper is not None:
337 curr_helper = bdev.BaseDRBD.GetUsermodeHelper()
338 except errors.BlockDeviceError, err:
339 raise errors.OpPrereqError("Error while checking drbd helper"
340 " (specify --no-drbd-storage if you are not"
341 " using drbd): %s" % str(err),
342 errors.ECODE_ENVIRON)
343 if drbd_helper != curr_helper:
344 raise errors.OpPrereqError("Error: requiring %s as drbd helper but %s"
345 " is the current helper" % (drbd_helper,
349 file_storage_dir = _InitFileStorage(file_storage_dir)
351 if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
352 raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,
355 result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
357 raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
359 result.output.strip()), errors.ECODE_INVAL)
361 dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
362 utils.EnsureDirs(dirs)
364 utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
365 utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
366 objects.NIC.CheckParameterSyntax(nicparams)
368 if ndparams is not None:
369 utils.ForceDictType(ndparams, constants.NDS_PARAMETER_TYPES)
371 ndparams = dict(constants.NDC_DEFAULTS)
373 # hvparams is a mapping of hypervisor->hvparams dict
374 for hv_name, hv_params in hvparams.iteritems():
375 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
376 hv_class = hypervisor.GetHypervisor(hv_name)
377 hv_class.CheckParameterSyntax(hv_params)
379 # set up ssh config and /etc/hosts
380 sshline = utils.ReadFile(constants.SSH_HOST_RSA_PUB)
381 sshkey = sshline.split(" ")[1]
384 utils.AddHostToEtcHosts(hostname.name, hostname.ip)
389 if default_iallocator is not None:
390 alloc_script = utils.FindFile(default_iallocator,
391 constants.IALLOCATOR_SEARCH_PATH,
393 if alloc_script is None:
394 raise errors.OpPrereqError("Invalid default iallocator script '%s'"
395 " specified" % default_iallocator,
400 # init of cluster config file
401 cluster_config = objects.Cluster(
403 rsahostkeypub=sshkey,
404 highest_used_port=(constants.FIRST_DRBD_PORT - 1),
405 mac_prefix=mac_prefix,
406 volume_group_name=vg_name,
407 tcpudp_port_pool=set(),
408 master_node=hostname.name,
409 master_ip=clustername.ip,
410 master_netdev=master_netdev,
411 cluster_name=clustername.name,
412 file_storage_dir=file_storage_dir,
413 shared_file_storage_dir=shared_file_storage_dir,
414 enabled_hypervisors=enabled_hypervisors,
415 beparams={constants.PP_DEFAULT: beparams},
416 nicparams={constants.PP_DEFAULT: nicparams},
419 candidate_pool_size=candidate_pool_size,
420 modify_etc_hosts=modify_etc_hosts,
421 modify_ssh_setup=modify_ssh_setup,
425 maintain_node_health=maintain_node_health,
426 drbd_usermode_helper=drbd_helper,
427 default_iallocator=default_iallocator,
428 primary_ip_family=ipcls.family,
429 prealloc_wipe_disks=prealloc_wipe_disks,
431 master_node_config = objects.Node(name=hostname.name,
432 primary_ip=hostname.ip,
433 secondary_ip=secondary_ip,
435 master_candidate=True,
436 offline=False, drained=False,
437 ctime=now, mtime=now,
439 InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)
440 cfg = config.ConfigWriter(offline=True)
441 ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
442 cfg.Update(cfg.GetClusterInfo(), logging.error)
443 backend.WriteSsconfFiles(cfg.GetSsconfValues())
445 # set up the inter-node password and certificate
446 _InitGanetiServerSetup(hostname.name)
448 logging.debug("Starting daemons")
449 result = utils.RunCmd([constants.DAEMON_UTIL, "start-all"])
451 raise errors.OpExecError("Could not start daemons, command %s"
452 " had exitcode %s and error %s" %
453 (result.cmd, result.exit_code, result.output))
455 _WaitForMasterDaemon()
458 def InitConfig(version, cluster_config, master_node_config,
459 cfg_file=constants.CLUSTER_CONF_FILE):
460 """Create the initial cluster configuration.
462 It will contain the current node, which will also be the master
463 node, and no instances.
466 @param version: configuration version
467 @type cluster_config: L{objects.Cluster}
468 @param cluster_config: cluster configuration
469 @type master_node_config: L{objects.Node}
470 @param master_node_config: master node configuration
471 @type cfg_file: string
472 @param cfg_file: configuration file path
475 uuid_generator = config.TemporaryReservationManager()
476 cluster_config.uuid = uuid_generator.Generate([], utils.NewUUID,
478 master_node_config.uuid = uuid_generator.Generate([], utils.NewUUID,
481 master_node_config.name: master_node_config,
483 default_nodegroup = objects.NodeGroup(
484 uuid=uuid_generator.Generate([], utils.NewUUID, _INITCONF_ECID),
485 name=constants.INITIAL_NODE_GROUP_NAME,
486 members=[master_node_config.name],
489 default_nodegroup.uuid: default_nodegroup,
492 config_data = objects.ConfigData(version=version,
493 cluster=cluster_config,
494 nodegroups=nodegroups,
498 ctime=now, mtime=now)
499 utils.WriteFile(cfg_file,
500 data=serializer.Dump(config_data.ToDict()),
504 def FinalizeClusterDestroy(master):
505 """Execute the last steps of cluster destroy
507 This function shuts down all the daemons, completing the destroy
508 begun in cmdlib.LUDestroyOpcode.
511 cfg = config.ConfigWriter()
512 modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
513 result = rpc.RpcRunner.call_node_stop_master(master, True)
514 msg = result.fail_msg
516 logging.warning("Could not disable the master role: %s", msg)
517 result = rpc.RpcRunner.call_node_leave_cluster(master, modify_ssh_setup)
518 msg = result.fail_msg
520 logging.warning("Could not shutdown the node daemon and cleanup"
521 " the node: %s", msg)
524 def SetupNodeDaemon(cluster_name, node, ssh_key_check):
525 """Add a node to the cluster.
527 This function must be called before the actual opcode, and will ssh
528 to the remote node, copy the needed files, and start ganeti-noded,
529 allowing the master to do the rest via normal rpc calls.
531 @param cluster_name: the cluster name
532 @param node: the name of the new node
533 @param ssh_key_check: whether to do a strict key check
536 family = ssconf.SimpleStore().GetPrimaryIPFamily()
537 sshrunner = ssh.SshRunner(cluster_name,
538 ipv6=(family == netutils.IP6Address.family))
540 bind_address = constants.IP4_ADDRESS_ANY
541 if family == netutils.IP6Address.family:
542 bind_address = constants.IP6_ADDRESS_ANY
544 # set up inter-node password and certificate and restarts the node daemon
545 # and then connect with ssh to set password and start ganeti-noded
546 # note that all the below variables are sanitized at this point,
547 # either by being constants or by the checks above
548 sshrunner.CopyFileToNode(node, constants.NODED_CERT_FILE)
549 sshrunner.CopyFileToNode(node, constants.RAPI_CERT_FILE)
550 sshrunner.CopyFileToNode(node, constants.CONFD_HMAC_KEY)
551 mycommand = ("%s stop-all; %s start %s -b %s" %
552 (constants.DAEMON_UTIL, constants.DAEMON_UTIL, constants.NODED,
553 utils.ShellQuote(bind_address)))
555 result = sshrunner.Run(node, 'root', mycommand, batch=False,
556 ask_key=ssh_key_check,
557 use_cluster_key=True,
558 strict_host_check=ssh_key_check)
560 raise errors.OpExecError("Remote command on node %s, error: %s,"
562 (node, result.fail_reason, result.output))
564 _WaitForNodeDaemon(node)
567 def MasterFailover(no_voting=False):
568 """Failover the master node.
570 This checks that we are not already the master, and will cause the
571 current master to cease being master, and the non-master to become
574 @type no_voting: boolean
575 @param no_voting: force the operation without remote nodes agreement
579 sstore = ssconf.SimpleStore()
581 old_master, new_master = ssconf.GetMasterAndMyself(sstore)
582 node_list = sstore.GetNodeList()
583 mc_list = sstore.GetMasterCandidates()
585 if old_master == new_master:
586 raise errors.OpPrereqError("This commands must be run on the node"
587 " where you want the new master to be."
588 " %s is already the master" %
589 old_master, errors.ECODE_INVAL)
591 if new_master not in mc_list:
592 mc_no_master = [name for name in mc_list if name != old_master]
593 raise errors.OpPrereqError("This node is not among the nodes marked"
594 " as master candidates. Only these nodes"
595 " can become masters. Current list of"
596 " master candidates is:\n"
597 "%s" % ('\n'.join(mc_no_master)),
601 vote_list = GatherMasterVotes(node_list)
604 voted_master = vote_list[0][0]
605 if voted_master is None:
606 raise errors.OpPrereqError("Cluster is inconsistent, most nodes did"
607 " not respond.", errors.ECODE_ENVIRON)
608 elif voted_master != old_master:
609 raise errors.OpPrereqError("I have a wrong configuration, I believe"
610 " the master is %s but the other nodes"
611 " voted %s. Please resync the configuration"
613 (old_master, voted_master),
619 logging.info("Setting master to %s, old master: %s", new_master, old_master)
622 # instantiate a real config writer, as we now know we have the
624 cfg = config.ConfigWriter(accept_foreign=True)
626 cluster_info = cfg.GetClusterInfo()
627 cluster_info.master_node = new_master
628 # this will also regenerate the ssconf files, since we updated the
630 cfg.Update(cluster_info, logging.error)
631 except errors.ConfigurationError, err:
632 logging.error("Error while trying to set the new master: %s",
636 # if cfg.Update worked, then it means the old master daemon won't be
637 # able now to write its own config file (we rely on locking in both
638 # backend.UploadFile() and ConfigWriter._Write(); hence the next
639 # step is to kill the old master
641 logging.info("Stopping the master daemon on node %s", old_master)
643 result = rpc.RpcRunner.call_node_stop_master(old_master, True)
644 msg = result.fail_msg
646 logging.error("Could not disable the master role on the old master"
647 " %s, please disable manually: %s", old_master, msg)
649 logging.info("Checking master IP non-reachability...")
651 master_ip = sstore.GetMasterIP()
653 # Here we have a phase where no master should be running
655 if netutils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
656 raise utils.RetryAgain()
659 utils.Retry(_check_ip, (1, 1.5, 5), total_timeout)
660 except utils.RetryTimeout:
661 logging.warning("The master IP is still reachable after %s seconds,"
662 " continuing but activating the master on the current"
663 " node will probably fail", total_timeout)
665 if jstore.CheckDrainFlag():
666 logging.info("Undraining job queue")
667 jstore.SetDrainFlag(False)
669 logging.info("Starting the master daemons on the new master")
671 result = rpc.RpcRunner.call_node_start_master(new_master, True, no_voting)
672 msg = result.fail_msg
674 logging.error("Could not start the master role on the new master"
675 " %s, please check: %s", new_master, msg)
678 logging.info("Master failed over from %s to %s", old_master, new_master)
683 """Returns the current master node.
685 This is a separate function in bootstrap since it's needed by
686 gnt-cluster, and instead of importing directly ssconf, it's better
687 to abstract it in bootstrap, where we do use ssconf in other
691 sstore = ssconf.SimpleStore()
693 old_master, _ = ssconf.GetMasterAndMyself(sstore)
698 def GatherMasterVotes(node_list):
699 """Check the agreement on who is the master.
701 This function will return a list of (node, number of votes), ordered
702 by the number of votes. Errors will be denoted by the key 'None'.
704 Note that the sum of votes is the number of nodes this machine
705 knows, whereas the number of entries in the list could be different
706 (if some nodes vote for another master).
708 We remove ourselves from the list since we know that (bugs aside)
709 since we use the same source for configuration information for both
710 backend and boostrap, we'll always vote for ourselves.
712 @type node_list: list
713 @param node_list: the list of nodes to query for master info; the current
714 node will be removed if it is in the list
716 @return: list of (node, votes)
719 myself = netutils.Hostname.GetSysName()
721 node_list.remove(myself)
725 # no nodes left (eventually after removing myself)
727 results = rpc.RpcRunner.call_master_info(node_list)
728 if not isinstance(results, dict):
729 # this should not happen (unless internal error in rpc)
730 logging.critical("Can't complete rpc call, aborting master startup")
731 return [(None, len(node_list))]
739 logging.warning("Error contacting node %s: %s", node, msg)
741 # for now we accept both length 3 and 4 (data[3] is primary ip version)
742 elif not isinstance(data, (tuple, list)) or len(data) < 3:
743 logging.warning("Invalid data received from node %s: %s", node, data)
746 if None not in votes:
750 master_node = data[2]
751 if master_node not in votes:
752 votes[master_node] = 0
753 votes[master_node] += 1
755 vote_list = [v for v in votes.items()]
756 # sort first on number of votes then on name, since we want None
757 # sorted later if we have the half of the nodes not responding, and
758 # half voting all for the same master
759 vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)