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22 """Functions to bootstrap a new cluster.
23
24 """
25
26 import os
27 import os.path
28 import re
29 import logging
30 import time
31
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
45
47 """Setup the SSH configuration for the cluster.
48
49 This generates a dsa keypair for root, adds the pub key to the
50 permitted hosts and adds the hostkey to its own known hosts.
51
52 """
53 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
54
55 for name in priv_key, pub_key:
56 if os.path.exists(name):
57 utils.CreateBackup(name)
58 utils.RemoveFile(name)
59
60 result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
61 "-f", priv_key,
62 "-q", "-N", ""])
63 if result.failed:
64 raise errors.OpExecError("Could not generate ssh keypair, error %s" %
65 result.output)
66
67 utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
68
69
71 """Writes a new HMAC key.
72
73 @type file_name: str
74 @param file_name: Path to output file
75
76 """
77 utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,
78 backup=True)
79
80
87 """Updates the cluster certificates, keys and secrets.
88
89 @type new_cluster_cert: bool
90 @param new_cluster_cert: Whether to generate a new cluster certificate
91 @type new_rapi_cert: bool
92 @param new_rapi_cert: Whether to generate a new RAPI certificate
93 @type new_confd_hmac_key: bool
94 @param new_confd_hmac_key: Whether to generate a new HMAC key
95 @type new_cds: bool
96 @param new_cds: Whether to generate a new cluster domain secret
97 @type rapi_cert_pem: string
98 @param rapi_cert_pem: New RAPI certificate in PEM format
99 @type cds: string
100 @param cds: New cluster domain secret
101 @type nodecert_file: string
102 @param nodecert_file: optional override of the node cert file path
103 @type rapicert_file: string
104 @param rapicert_file: optional override of the rapi cert file path
105 @type hmackey_file: string
106 @param hmackey_file: optional override of the hmac key file path
107
108 """
109
110 cluster_cert_exists = os.path.exists(nodecert_file)
111 if new_cluster_cert or not cluster_cert_exists:
112 if cluster_cert_exists:
113 utils.CreateBackup(nodecert_file)
114
115 logging.debug("Generating new cluster certificate at %s", nodecert_file)
116 utils.GenerateSelfSignedSslCert(nodecert_file)
117
118
119 if new_confd_hmac_key or not os.path.exists(hmackey_file):
120 logging.debug("Writing new confd HMAC key to %s", hmackey_file)
121 GenerateHmacKey(hmackey_file)
122
123
124 rapi_cert_exists = os.path.exists(rapicert_file)
125
126 if rapi_cert_pem:
127
128 logging.debug("Writing RAPI certificate at %s", rapicert_file)
129 utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)
130
131 elif new_rapi_cert or not rapi_cert_exists:
132 if rapi_cert_exists:
133 utils.CreateBackup(rapicert_file)
134
135 logging.debug("Generating new RAPI certificate at %s", rapicert_file)
136 utils.GenerateSelfSignedSslCert(rapicert_file)
137
138
139 if cds:
140 logging.debug("Writing cluster domain secret to %s", cds_file)
141 utils.WriteFile(cds_file, data=cds, backup=True)
142
143 elif new_cds or not os.path.exists(cds_file):
144 logging.debug("Generating new cluster domain secret at %s", cds_file)
145 GenerateHmacKey(cds_file)
146
147
149 """Setup the necessary configuration for the initial node daemon.
150
151 This creates the nodepass file containing the shared password for
152 the cluster, generates the SSL certificate and starts the node daemon.
153
154 @type master_name: str
155 @param master_name: Name of the master node
156
157 """
158
159 GenerateClusterCrypto(True, False, False, False)
160
161 result = utils.RunCmd([constants.DAEMON_UTIL, "start", constants.NODED])
162 if result.failed:
163 raise errors.OpExecError("Could not start the node daemon, command %s"
164 " had exitcode %s and error %s" %
165 (result.cmd, result.exit_code, result.output))
166
167 _WaitForNodeDaemon(master_name)
168
169
171 """Wait for node daemon to become responsive.
172
173 """
174 def _CheckNodeDaemon():
175 result = rpc.RpcRunner.call_version([node_name])[node_name]
176 if result.fail_msg:
177 raise utils.RetryAgain()
178
179 try:
180 utils.Retry(_CheckNodeDaemon, 1.0, 10.0)
181 except utils.RetryTimeout:
182 raise errors.OpExecError("Node daemon on %s didn't answer queries within"
183 " 10 seconds" % node_name)
184
185
187 """Initialize if needed the file storage.
188
189 @param file_storage_dir: the user-supplied value
190 @return: either empty string (if file storage was disabled at build
191 time) or the normalized path to the storage directory
192
193 """
194 if not constants.ENABLE_FILE_STORAGE:
195 return ""
196
197 file_storage_dir = os.path.normpath(file_storage_dir)
198
199 if not os.path.isabs(file_storage_dir):
200 raise errors.OpPrereqError("The file storage directory you passed is"
201 " not an absolute path.", errors.ECODE_INVAL)
202
203 if not os.path.exists(file_storage_dir):
204 try:
205 os.makedirs(file_storage_dir, 0750)
206 except OSError, err:
207 raise errors.OpPrereqError("Cannot create file storage directory"
208 " '%s': %s" % (file_storage_dir, err),
209 errors.ECODE_ENVIRON)
210
211 if not os.path.isdir(file_storage_dir):
212 raise errors.OpPrereqError("The file storage directory '%s' is not"
213 " a directory." % file_storage_dir,
214 errors.ECODE_ENVIRON)
215 return file_storage_dir
216
217
218
219 -def InitCluster(cluster_name, mac_prefix,
220 master_netdev, file_storage_dir, candidate_pool_size,
221 secondary_ip=None, vg_name=None, beparams=None,
222 nicparams=None, hvparams=None, enabled_hypervisors=None,
223 modify_etc_hosts=True, modify_ssh_setup=True,
224 maintain_node_health=False, drbd_helper=None,
225 uid_pool=None, default_iallocator=None):
226 """Initialise the cluster.
227
228 @type candidate_pool_size: int
229 @param candidate_pool_size: master candidate pool size
230
231 """
232
233 if config.ConfigWriter.IsCluster():
234 raise errors.OpPrereqError("Cluster is already initialised",
235 errors.ECODE_STATE)
236
237 if not enabled_hypervisors:
238 raise errors.OpPrereqError("Enabled hypervisors list must contain at"
239 " least one member", errors.ECODE_INVAL)
240 invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES
241 if invalid_hvs:
242 raise errors.OpPrereqError("Enabled hypervisors contains invalid"
243 " entries: %s" % invalid_hvs,
244 errors.ECODE_INVAL)
245
246 hostname = netutils.GetHostInfo()
247
248 if hostname.ip.startswith("127."):
249 raise errors.OpPrereqError("This host's IP resolves to the private"
250 " range (%s). Please fix DNS or %s." %
251 (hostname.ip, constants.ETC_HOSTS),
252 errors.ECODE_ENVIRON)
253
254 if not netutils.OwnIpAddress(hostname.ip):
255 raise errors.OpPrereqError("Inconsistency: this host's name resolves"
256 " to %s,\nbut this ip address does not"
257 " belong to this host. Aborting." %
258 hostname.ip, errors.ECODE_ENVIRON)
259
260 clustername = \
261 netutils.GetHostInfo(netutils.HostInfo.NormalizeName(cluster_name))
262
263 if netutils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
264 timeout=5):
265 raise errors.OpPrereqError("Cluster IP already active. Aborting.",
266 errors.ECODE_NOTUNIQUE)
267
268 if secondary_ip:
269 if not netutils.IsValidIP4(secondary_ip):
270 raise errors.OpPrereqError("Invalid secondary ip given",
271 errors.ECODE_INVAL)
272 if (secondary_ip != hostname.ip and
273 not netutils.OwnIpAddress(secondary_ip)):
274 raise errors.OpPrereqError("You gave %s as secondary IP,"
275 " but it does not belong to this host." %
276 secondary_ip, errors.ECODE_ENVIRON)
277 else:
278 secondary_ip = hostname.ip
279
280 if vg_name is not None:
281
282 vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
283 constants.MIN_VG_SIZE)
284 if vgstatus:
285 raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
286 " you are not using lvm" % vgstatus,
287 errors.ECODE_INVAL)
288
289 if drbd_helper is not None:
290 try:
291 curr_helper = bdev.BaseDRBD.GetUsermodeHelper()
292 except errors.BlockDeviceError, err:
293 raise errors.OpPrereqError("Error while checking drbd helper"
294 " (specify --no-drbd-storage if you are not"
295 " using drbd): %s" % str(err),
296 errors.ECODE_ENVIRON)
297 if drbd_helper != curr_helper:
298 raise errors.OpPrereqError("Error: requiring %s as drbd helper but %s"
299 " is the current helper" % (drbd_helper,
300 curr_helper),
301 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 raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,
307 errors.ECODE_INVAL)
308
309 result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
310 if result.failed:
311 raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
312 (master_netdev,
313 result.output.strip()), errors.ECODE_INVAL)
314
315 dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
316 utils.EnsureDirs(dirs)
317
318 utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
319 utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
320 objects.NIC.CheckParameterSyntax(nicparams)
321
322
323 for hv_name, hv_params in hvparams.iteritems():
324 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
325 hv_class = hypervisor.GetHypervisor(hv_name)
326 hv_class.CheckParameterSyntax(hv_params)
327
328
329 _InitGanetiServerSetup(hostname.name)
330
331
332 sshline = utils.ReadFile(constants.SSH_HOST_RSA_PUB)
333 sshkey = sshline.split(" ")[1]
334
335 if modify_etc_hosts:
336 utils.AddHostToEtcHosts(hostname.name)
337
338 if modify_ssh_setup:
339 _InitSSHSetup()
340
341 if default_iallocator is not None:
342 alloc_script = utils.FindFile(default_iallocator,
343 constants.IALLOCATOR_SEARCH_PATH,
344 os.path.isfile)
345 if alloc_script is None:
346 raise errors.OpPrereqError("Invalid default iallocator script '%s'"
347 " specified" % default_iallocator,
348 errors.ECODE_INVAL)
349
350 now = time.time()
351
352
353 cluster_config = objects.Cluster(
354 serial_no=1,
355 rsahostkeypub=sshkey,
356 highest_used_port=(constants.FIRST_DRBD_PORT - 1),
357 mac_prefix=mac_prefix,
358 volume_group_name=vg_name,
359 tcpudp_port_pool=set(),
360 master_node=hostname.name,
361 master_ip=clustername.ip,
362 master_netdev=master_netdev,
363 cluster_name=clustername.name,
364 file_storage_dir=file_storage_dir,
365 enabled_hypervisors=enabled_hypervisors,
366 beparams={constants.PP_DEFAULT: beparams},
367 nicparams={constants.PP_DEFAULT: nicparams},
368 hvparams=hvparams,
369 candidate_pool_size=candidate_pool_size,
370 modify_etc_hosts=modify_etc_hosts,
371 modify_ssh_setup=modify_ssh_setup,
372 uid_pool=uid_pool,
373 ctime=now,
374 mtime=now,
375 uuid=utils.NewUUID(),
376 maintain_node_health=maintain_node_health,
377 drbd_usermode_helper=drbd_helper,
378 default_iallocator=default_iallocator,
379 )
380 master_node_config = objects.Node(name=hostname.name,
381 primary_ip=hostname.ip,
382 secondary_ip=secondary_ip,
383 serial_no=1,
384 master_candidate=True,
385 offline=False, drained=False,
386 )
387 InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)
388 cfg = config.ConfigWriter()
389 ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
390 cfg.Update(cfg.GetClusterInfo(), logging.error)
391
392
393
394
395 rpc.RpcRunner.call_node_start_master(hostname.name, True, False)
396
397
400 """Create the initial cluster configuration.
401
402 It will contain the current node, which will also be the master
403 node, and no instances.
404
405 @type version: int
406 @param version: configuration version
407 @type cluster_config: L{objects.Cluster}
408 @param cluster_config: cluster configuration
409 @type master_node_config: L{objects.Node}
410 @param master_node_config: master node configuration
411 @type cfg_file: string
412 @param cfg_file: configuration file path
413
414 """
415 nodes = {
416 master_node_config.name: master_node_config,
417 }
418
419 now = time.time()
420 config_data = objects.ConfigData(version=version,
421 cluster=cluster_config,
422 nodes=nodes,
423 instances={},
424 serial_no=1,
425 ctime=now, mtime=now)
426 utils.WriteFile(cfg_file,
427 data=serializer.Dump(config_data.ToDict()),
428 mode=0600)
429
430
432 """Execute the last steps of cluster destroy
433
434 This function shuts down all the daemons, completing the destroy
435 begun in cmdlib.LUDestroyOpcode.
436
437 """
438 cfg = config.ConfigWriter()
439 modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
440 result = rpc.RpcRunner.call_node_stop_master(master, True)
441 msg = result.fail_msg
442 if msg:
443 logging.warning("Could not disable the master role: %s", msg)
444 result = rpc.RpcRunner.call_node_leave_cluster(master, modify_ssh_setup)
445 msg = result.fail_msg
446 if msg:
447 logging.warning("Could not shutdown the node daemon and cleanup"
448 " the node: %s", msg)
449
450
452 """Add a node to the cluster.
453
454 This function must be called before the actual opcode, and will ssh
455 to the remote node, copy the needed files, and start ganeti-noded,
456 allowing the master to do the rest via normal rpc calls.
457
458 @param cluster_name: the cluster name
459 @param node: the name of the new node
460 @param ssh_key_check: whether to do a strict key check
461
462 """
463 sshrunner = ssh.SshRunner(cluster_name)
464
465 noded_cert = utils.ReadFile(constants.NODED_CERT_FILE)
466 rapi_cert = utils.ReadFile(constants.RAPI_CERT_FILE)
467 confd_hmac_key = utils.ReadFile(constants.CONFD_HMAC_KEY)
468
469
470
471
472
473
474 for content in (noded_cert, rapi_cert, confd_hmac_key):
475 if re.search('^!EOF\.', content, re.MULTILINE):
476 raise errors.OpExecError("invalid SSL certificate or HMAC key")
477
478 if not noded_cert.endswith("\n"):
479 noded_cert += "\n"
480 if not rapi_cert.endswith("\n"):
481 rapi_cert += "\n"
482 if not confd_hmac_key.endswith("\n"):
483 confd_hmac_key += "\n"
484
485
486
487
488
489
490 mycommand = ("umask 077 && "
491 "cat > '%s' << '!EOF.' && \n"
492 "%s!EOF.\n"
493 "cat > '%s' << '!EOF.' && \n"
494 "%s!EOF.\n"
495 "cat > '%s' << '!EOF.' && \n"
496 "%s!EOF.\n"
497 "chmod 0400 %s %s %s && "
498 "%s start %s" %
499 (constants.NODED_CERT_FILE, noded_cert,
500 constants.RAPI_CERT_FILE, rapi_cert,
501 constants.CONFD_HMAC_KEY, confd_hmac_key,
502 constants.NODED_CERT_FILE, constants.RAPI_CERT_FILE,
503 constants.CONFD_HMAC_KEY,
504 constants.DAEMON_UTIL, constants.NODED))
505
506 result = sshrunner.Run(node, 'root', mycommand, batch=False,
507 ask_key=ssh_key_check,
508 use_cluster_key=False,
509 strict_host_check=ssh_key_check)
510 if result.failed:
511 raise errors.OpExecError("Remote command on node %s, error: %s,"
512 " output: %s" %
513 (node, result.fail_reason, result.output))
514
515 _WaitForNodeDaemon(node)
516
517
519 """Failover the master node.
520
521 This checks that we are not already the master, and will cause the
522 current master to cease being master, and the non-master to become
523 new master.
524
525 @type no_voting: boolean
526 @param no_voting: force the operation without remote nodes agreement
527 (dangerous)
528
529 """
530 sstore = ssconf.SimpleStore()
531
532 old_master, new_master = ssconf.GetMasterAndMyself(sstore)
533 node_list = sstore.GetNodeList()
534 mc_list = sstore.GetMasterCandidates()
535
536 if old_master == new_master:
537 raise errors.OpPrereqError("This commands must be run on the node"
538 " where you want the new master to be."
539 " %s is already the master" %
540 old_master, errors.ECODE_INVAL)
541
542 if new_master not in mc_list:
543 mc_no_master = [name for name in mc_list if name != old_master]
544 raise errors.OpPrereqError("This node is not among the nodes marked"
545 " as master candidates. Only these nodes"
546 " can become masters. Current list of"
547 " master candidates is:\n"
548 "%s" % ('\n'.join(mc_no_master)),
549 errors.ECODE_STATE)
550
551 if not no_voting:
552 vote_list = GatherMasterVotes(node_list)
553
554 if vote_list:
555 voted_master = vote_list[0][0]
556 if voted_master is None:
557 raise errors.OpPrereqError("Cluster is inconsistent, most nodes did"
558 " not respond.", errors.ECODE_ENVIRON)
559 elif voted_master != old_master:
560 raise errors.OpPrereqError("I have a wrong configuration, I believe"
561 " the master is %s but the other nodes"
562 " voted %s. Please resync the configuration"
563 " of this node." %
564 (old_master, voted_master),
565 errors.ECODE_STATE)
566
567
568 rcode = 0
569
570 logging.info("Setting master to %s, old master: %s", new_master, old_master)
571
572 result = rpc.RpcRunner.call_node_stop_master(old_master, True)
573 msg = result.fail_msg
574 if msg:
575 logging.error("Could not disable the master role on the old master"
576 " %s, please disable manually: %s", old_master, msg)
577
578 master_ip = sstore.GetMasterIP()
579 total_timeout = 30
580
581 def _check_ip():
582 if netutils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
583 raise utils.RetryAgain()
584
585 try:
586 utils.Retry(_check_ip, (1, 1.5, 5), total_timeout)
587 except utils.RetryTimeout:
588 logging.warning("The master IP is still reachable after %s seconds,"
589 " continuing but activating the master on the current"
590 " node will probably fail", total_timeout)
591
592
593
594 cfg = config.ConfigWriter()
595
596 cluster_info = cfg.GetClusterInfo()
597 cluster_info.master_node = new_master
598
599
600 cfg.Update(cluster_info, logging.error)
601
602 result = rpc.RpcRunner.call_node_start_master(new_master, True, no_voting)
603 msg = result.fail_msg
604 if msg:
605 logging.error("Could not start the master role on the new master"
606 " %s, please check: %s", new_master, msg)
607 rcode = 1
608
609 return rcode
610
611
613 """Returns the current master node.
614
615 This is a separate function in bootstrap since it's needed by
616 gnt-cluster, and instead of importing directly ssconf, it's better
617 to abstract it in bootstrap, where we do use ssconf in other
618 functions too.
619
620 """
621 sstore = ssconf.SimpleStore()
622
623 old_master, _ = ssconf.GetMasterAndMyself(sstore)
624
625 return old_master
626
627
629 """Check the agreement on who is the master.
630
631 This function will return a list of (node, number of votes), ordered
632 by the number of votes. Errors will be denoted by the key 'None'.
633
634 Note that the sum of votes is the number of nodes this machine
635 knows, whereas the number of entries in the list could be different
636 (if some nodes vote for another master).
637
638 We remove ourselves from the list since we know that (bugs aside)
639 since we use the same source for configuration information for both
640 backend and boostrap, we'll always vote for ourselves.
641
642 @type node_list: list
643 @param node_list: the list of nodes to query for master info; the current
644 node will be removed if it is in the list
645 @rtype: list
646 @return: list of (node, votes)
647
648 """
649 myself = netutils.HostInfo().name
650 try:
651 node_list.remove(myself)
652 except ValueError:
653 pass
654 if not node_list:
655
656 return []
657 results = rpc.RpcRunner.call_master_info(node_list)
658 if not isinstance(results, dict):
659
660 logging.critical("Can't complete rpc call, aborting master startup")
661 return [(None, len(node_list))]
662 votes = {}
663 for node in results:
664 nres = results[node]
665 data = nres.payload
666 msg = nres.fail_msg
667 fail = False
668 if msg:
669 logging.warning("Error contacting node %s: %s", node, msg)
670 fail = True
671 elif not isinstance(data, (tuple, list)) or len(data) < 3:
672 logging.warning("Invalid data received from node %s: %s", node, data)
673 fail = True
674 if fail:
675 if None not in votes:
676 votes[None] = 0
677 votes[None] += 1
678 continue
679 master_node = data[2]
680 if master_node not in votes:
681 votes[master_node] = 0
682 votes[master_node] += 1
683
684 vote_list = [v for v in votes.items()]
685
686
687
688 vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)
689
690 return vote_list
691