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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 tempfile
31 import time
32
33 from ganeti import rpc
34 from ganeti import ssh
35 from ganeti import utils
36 from ganeti import errors
37 from ganeti import config
38 from ganeti import constants
39 from ganeti import objects
40 from ganeti import ssconf
41 from ganeti import serializer
42 from ganeti import hypervisor
43
44
46 """Setup the SSH configuration for the cluster.
47
48 This generates a dsa keypair for root, adds the pub key to the
49 permitted hosts and adds the hostkey to its own known hosts.
50
51 """
52 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
53
54 for name in priv_key, pub_key:
55 if os.path.exists(name):
56 utils.CreateBackup(name)
57 utils.RemoveFile(name)
58
59 result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
60 "-f", priv_key,
61 "-q", "-N", ""])
62 if result.failed:
63 raise errors.OpExecError("Could not generate ssh keypair, error %s" %
64 result.output)
65
66 utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
67
68
70 """Generates a self-signed SSL certificate.
71
72 @type file_name: str
73 @param file_name: Path to output file
74 @type validity: int
75 @param validity: Validity for certificate in days
76
77 """
78 (fd, tmp_file_name) = tempfile.mkstemp(dir=os.path.dirname(file_name))
79 try:
80 try:
81
82 os.chmod(tmp_file_name, 0600)
83
84 result = utils.RunCmd(["openssl", "req", "-new", "-newkey", "rsa:1024",
85 "-days", str(validity), "-nodes", "-x509",
86 "-keyout", tmp_file_name, "-out", tmp_file_name,
87 "-batch"])
88 if result.failed:
89 raise errors.OpExecError("Could not generate SSL certificate, command"
90 " %s had exitcode %s and error message %s" %
91 (result.cmd, result.exit_code, result.output))
92
93
94 os.chmod(tmp_file_name, 0400)
95
96 os.rename(tmp_file_name, file_name)
97 finally:
98 utils.RemoveFile(tmp_file_name)
99 finally:
100 os.close(fd)
101
102
104 """Writes a new HMAC key.
105
106 @type file_name: str
107 @param file_name: Path to output file
108
109 """
110 utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,
111 backup=True)
112
113
119 """Updates the cluster certificates, keys and secrets.
120
121 @type new_cluster_cert: bool
122 @param new_cluster_cert: Whether to generate a new cluster certificate
123 @type new_rapi_cert: bool
124 @param new_rapi_cert: Whether to generate a new RAPI certificate
125 @type new_confd_hmac_key: bool
126 @param new_confd_hmac_key: Whether to generate a new HMAC key
127 @type rapi_cert_pem: string
128 @param rapi_cert_pem: New RAPI certificate in PEM format
129 @type nodecert_file: string
130 @param nodecert_file: optional override of the node cert file path
131 @type rapicert_file: string
132 @param rapicert_file: optional override of the rapi cert file path
133 @type hmackey_file: string
134 @param hmackey_file: optional override of the hmac key file path
135
136 """
137
138 cluster_cert_exists = os.path.exists(nodecert_file)
139 if new_cluster_cert or not cluster_cert_exists:
140 if cluster_cert_exists:
141 utils.CreateBackup(nodecert_file)
142
143 logging.debug("Generating new cluster certificate at %s", nodecert_file)
144 GenerateSelfSignedSslCert(nodecert_file)
145
146
147 if new_confd_hmac_key or not os.path.exists(hmackey_file):
148 logging.debug("Writing new confd HMAC key to %s", hmackey_file)
149 GenerateHmacKey(hmackey_file)
150
151
152 rapi_cert_exists = os.path.exists(rapicert_file)
153
154 if rapi_cert_pem:
155
156 logging.debug("Writing RAPI certificate at %s", rapicert_file)
157 utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)
158
159 elif new_rapi_cert or not rapi_cert_exists:
160 if rapi_cert_exists:
161 utils.CreateBackup(rapicert_file)
162
163 logging.debug("Generating new RAPI certificate at %s", rapicert_file)
164 GenerateSelfSignedSslCert(rapicert_file)
165
166
168 """Setup the necessary configuration for the initial node daemon.
169
170 This creates the nodepass file containing the shared password for
171 the cluster and also generates the SSL certificate.
172
173 """
174
175 GenerateClusterCrypto(True, False, False)
176
177 result = utils.RunCmd([constants.DAEMON_UTIL, "start", constants.NODED])
178 if result.failed:
179 raise errors.OpExecError("Could not start the node daemon, command %s"
180 " had exitcode %s and error %s" %
181 (result.cmd, result.exit_code, result.output))
182
183 _WaitForNodeDaemon(master_name)
184
185
187 """Wait for node daemon to become responsive.
188
189 """
190 def _CheckNodeDaemon():
191 result = rpc.RpcRunner.call_version([node_name])[node_name]
192 if result.fail_msg:
193 raise utils.RetryAgain()
194
195 try:
196 utils.Retry(_CheckNodeDaemon, 1.0, 10.0)
197 except utils.RetryTimeout:
198 raise errors.OpExecError("Node daemon on %s didn't answer queries within"
199 " 10 seconds" % node_name)
200
201
203 """Initialize if needed the file storage.
204
205 @param file_storage_dir: the user-supplied value
206 @return: either empty string (if file storage was disabled at build
207 time) or the normalized path to the storage directory
208
209 """
210 if not constants.ENABLE_FILE_STORAGE:
211 return ""
212
213 file_storage_dir = os.path.normpath(file_storage_dir)
214
215 if not os.path.isabs(file_storage_dir):
216 raise errors.OpPrereqError("The file storage directory you passed is"
217 " not an absolute path.", errors.ECODE_INVAL)
218
219 if not os.path.exists(file_storage_dir):
220 try:
221 os.makedirs(file_storage_dir, 0750)
222 except OSError, err:
223 raise errors.OpPrereqError("Cannot create file storage directory"
224 " '%s': %s" % (file_storage_dir, err),
225 errors.ECODE_ENVIRON)
226
227 if not os.path.isdir(file_storage_dir):
228 raise errors.OpPrereqError("The file storage directory '%s' is not"
229 " a directory." % file_storage_dir,
230 errors.ECODE_ENVIRON)
231 return file_storage_dir
232
233
234 -def InitCluster(cluster_name, mac_prefix,
235 master_netdev, file_storage_dir, candidate_pool_size,
236 secondary_ip=None, vg_name=None, beparams=None,
237 nicparams=None, hvparams=None, enabled_hypervisors=None,
238 modify_etc_hosts=True, modify_ssh_setup=True,
239 maintain_node_health=False,
240 uid_pool=None):
241 """Initialise the cluster.
242
243 @type candidate_pool_size: int
244 @param candidate_pool_size: master candidate pool size
245
246 """
247
248 if config.ConfigWriter.IsCluster():
249 raise errors.OpPrereqError("Cluster is already initialised",
250 errors.ECODE_STATE)
251
252 if not enabled_hypervisors:
253 raise errors.OpPrereqError("Enabled hypervisors list must contain at"
254 " least one member", errors.ECODE_INVAL)
255 invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES
256 if invalid_hvs:
257 raise errors.OpPrereqError("Enabled hypervisors contains invalid"
258 " entries: %s" % invalid_hvs,
259 errors.ECODE_INVAL)
260
261 hostname = utils.GetHostInfo()
262
263 if hostname.ip.startswith("127."):
264 raise errors.OpPrereqError("This host's IP resolves to the private"
265 " range (%s). Please fix DNS or %s." %
266 (hostname.ip, constants.ETC_HOSTS),
267 errors.ECODE_ENVIRON)
268
269 if not utils.OwnIpAddress(hostname.ip):
270 raise errors.OpPrereqError("Inconsistency: this host's name resolves"
271 " to %s,\nbut this ip address does not"
272 " belong to this host. Aborting." %
273 hostname.ip, errors.ECODE_ENVIRON)
274
275 clustername = utils.GetHostInfo(utils.HostInfo.NormalizeName(cluster_name))
276
277 if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
278 timeout=5):
279 raise errors.OpPrereqError("Cluster IP already active. Aborting.",
280 errors.ECODE_NOTUNIQUE)
281
282 if secondary_ip:
283 if not utils.IsValidIP(secondary_ip):
284 raise errors.OpPrereqError("Invalid secondary ip given",
285 errors.ECODE_INVAL)
286 if (secondary_ip != hostname.ip and
287 not utils.OwnIpAddress(secondary_ip)):
288 raise errors.OpPrereqError("You gave %s as secondary IP,"
289 " but it does not belong to this host." %
290 secondary_ip, errors.ECODE_ENVIRON)
291 else:
292 secondary_ip = hostname.ip
293
294 if vg_name is not None:
295
296 vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
297 constants.MIN_VG_SIZE)
298 if vgstatus:
299 raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
300 " you are not using lvm" % vgstatus,
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 now = time.time()
342
343
344 cluster_config = objects.Cluster(
345 serial_no=1,
346 rsahostkeypub=sshkey,
347 highest_used_port=(constants.FIRST_DRBD_PORT - 1),
348 mac_prefix=mac_prefix,
349 volume_group_name=vg_name,
350 tcpudp_port_pool=set(),
351 master_node=hostname.name,
352 master_ip=clustername.ip,
353 master_netdev=master_netdev,
354 cluster_name=clustername.name,
355 file_storage_dir=file_storage_dir,
356 enabled_hypervisors=enabled_hypervisors,
357 beparams={constants.PP_DEFAULT: beparams},
358 nicparams={constants.PP_DEFAULT: nicparams},
359 hvparams=hvparams,
360 candidate_pool_size=candidate_pool_size,
361 modify_etc_hosts=modify_etc_hosts,
362 modify_ssh_setup=modify_ssh_setup,
363 uid_pool=uid_pool,
364 ctime=now,
365 mtime=now,
366 uuid=utils.NewUUID(),
367 maintain_node_health=maintain_node_health,
368 )
369 master_node_config = objects.Node(name=hostname.name,
370 primary_ip=hostname.ip,
371 secondary_ip=secondary_ip,
372 serial_no=1,
373 master_candidate=True,
374 offline=False, drained=False,
375 )
376 InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)
377 cfg = config.ConfigWriter()
378 ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
379 cfg.Update(cfg.GetClusterInfo(), logging.error)
380
381
382
383
384 rpc.RpcRunner.call_node_start_master(hostname.name, True, False)
385
386
389 """Create the initial cluster configuration.
390
391 It will contain the current node, which will also be the master
392 node, and no instances.
393
394 @type version: int
395 @param version: configuration version
396 @type cluster_config: L{objects.Cluster}
397 @param cluster_config: cluster configuration
398 @type master_node_config: L{objects.Node}
399 @param master_node_config: master node configuration
400 @type cfg_file: string
401 @param cfg_file: configuration file path
402
403 """
404 nodes = {
405 master_node_config.name: master_node_config,
406 }
407
408 now = time.time()
409 config_data = objects.ConfigData(version=version,
410 cluster=cluster_config,
411 nodes=nodes,
412 instances={},
413 serial_no=1,
414 ctime=now, mtime=now)
415 utils.WriteFile(cfg_file,
416 data=serializer.Dump(config_data.ToDict()),
417 mode=0600)
418
419
421 """Execute the last steps of cluster destroy
422
423 This function shuts down all the daemons, completing the destroy
424 begun in cmdlib.LUDestroyOpcode.
425
426 """
427 cfg = config.ConfigWriter()
428 modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup
429 result = rpc.RpcRunner.call_node_stop_master(master, True)
430 msg = result.fail_msg
431 if msg:
432 logging.warning("Could not disable the master role: %s", msg)
433 result = rpc.RpcRunner.call_node_leave_cluster(master, modify_ssh_setup)
434 msg = result.fail_msg
435 if msg:
436 logging.warning("Could not shutdown the node daemon and cleanup"
437 " the node: %s", msg)
438
439
441 """Add a node to the cluster.
442
443 This function must be called before the actual opcode, and will ssh
444 to the remote node, copy the needed files, and start ganeti-noded,
445 allowing the master to do the rest via normal rpc calls.
446
447 @param cluster_name: the cluster name
448 @param node: the name of the new node
449 @param ssh_key_check: whether to do a strict key check
450
451 """
452 sshrunner = ssh.SshRunner(cluster_name)
453
454 noded_cert = utils.ReadFile(constants.NODED_CERT_FILE)
455 rapi_cert = utils.ReadFile(constants.RAPI_CERT_FILE)
456 confd_hmac_key = utils.ReadFile(constants.CONFD_HMAC_KEY)
457
458
459
460
461
462
463 for content in (noded_cert, rapi_cert, confd_hmac_key):
464 if re.search('^!EOF\.', content, re.MULTILINE):
465 raise errors.OpExecError("invalid SSL certificate or HMAC key")
466
467 if not noded_cert.endswith("\n"):
468 noded_cert += "\n"
469 if not rapi_cert.endswith("\n"):
470 rapi_cert += "\n"
471 if not confd_hmac_key.endswith("\n"):
472 confd_hmac_key += "\n"
473
474
475
476
477
478 mycommand = ("umask 077 && "
479 "cat > '%s' << '!EOF.' && \n"
480 "%s!EOF.\n"
481 "cat > '%s' << '!EOF.' && \n"
482 "%s!EOF.\n"
483 "cat > '%s' << '!EOF.' && \n"
484 "%s!EOF.\n"
485 "chmod 0400 %s %s %s && "
486 "%s start %s" %
487 (constants.NODED_CERT_FILE, noded_cert,
488 constants.RAPI_CERT_FILE, rapi_cert,
489 constants.CONFD_HMAC_KEY, confd_hmac_key,
490 constants.NODED_CERT_FILE, constants.RAPI_CERT_FILE,
491 constants.CONFD_HMAC_KEY,
492 constants.DAEMON_UTIL, constants.NODED))
493
494 result = sshrunner.Run(node, 'root', mycommand, batch=False,
495 ask_key=ssh_key_check,
496 use_cluster_key=False,
497 strict_host_check=ssh_key_check)
498 if result.failed:
499 raise errors.OpExecError("Remote command on node %s, error: %s,"
500 " output: %s" %
501 (node, result.fail_reason, result.output))
502
503 _WaitForNodeDaemon(node)
504
505
507 """Failover the master node.
508
509 This checks that we are not already the master, and will cause the
510 current master to cease being master, and the non-master to become
511 new master.
512
513 @type no_voting: boolean
514 @param no_voting: force the operation without remote nodes agreement
515 (dangerous)
516
517 """
518 sstore = ssconf.SimpleStore()
519
520 old_master, new_master = ssconf.GetMasterAndMyself(sstore)
521 node_list = sstore.GetNodeList()
522 mc_list = sstore.GetMasterCandidates()
523
524 if old_master == new_master:
525 raise errors.OpPrereqError("This commands must be run on the node"
526 " where you want the new master to be."
527 " %s is already the master" %
528 old_master, errors.ECODE_INVAL)
529
530 if new_master not in mc_list:
531 mc_no_master = [name for name in mc_list if name != old_master]
532 raise errors.OpPrereqError("This node is not among the nodes marked"
533 " as master candidates. Only these nodes"
534 " can become masters. Current list of"
535 " master candidates is:\n"
536 "%s" % ('\n'.join(mc_no_master)),
537 errors.ECODE_STATE)
538
539 if not no_voting:
540 vote_list = GatherMasterVotes(node_list)
541
542 if vote_list:
543 voted_master = vote_list[0][0]
544 if voted_master is None:
545 raise errors.OpPrereqError("Cluster is inconsistent, most nodes did"
546 " not respond.", errors.ECODE_ENVIRON)
547 elif voted_master != old_master:
548 raise errors.OpPrereqError("I have a wrong configuration, I believe"
549 " the master is %s but the other nodes"
550 " voted %s. Please resync the configuration"
551 " of this node." %
552 (old_master, voted_master),
553 errors.ECODE_STATE)
554
555
556 rcode = 0
557
558 logging.info("Setting master to %s, old master: %s", new_master, old_master)
559
560 result = rpc.RpcRunner.call_node_stop_master(old_master, True)
561 msg = result.fail_msg
562 if msg:
563 logging.error("Could not disable the master role on the old master"
564 " %s, please disable manually: %s", old_master, msg)
565
566 master_ip = sstore.GetMasterIP()
567 total_timeout = 30
568
569 def _check_ip():
570 if utils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
571 raise utils.RetryAgain()
572
573 try:
574 utils.Retry(_check_ip, (1, 1.5, 5), total_timeout)
575 except utils.RetryTimeout:
576 logging.warning("The master IP is still reachable after %s seconds,"
577 " continuing but activating the master on the current"
578 " node will probably fail", total_timeout)
579
580
581
582 cfg = config.ConfigWriter()
583
584 cluster_info = cfg.GetClusterInfo()
585 cluster_info.master_node = new_master
586
587
588 cfg.Update(cluster_info, logging.error)
589
590 result = rpc.RpcRunner.call_node_start_master(new_master, True, no_voting)
591 msg = result.fail_msg
592 if msg:
593 logging.error("Could not start the master role on the new master"
594 " %s, please check: %s", new_master, msg)
595 rcode = 1
596
597 return rcode
598
599
601 """Returns the current master node.
602
603 This is a separate function in bootstrap since it's needed by
604 gnt-cluster, and instead of importing directly ssconf, it's better
605 to abstract it in bootstrap, where we do use ssconf in other
606 functions too.
607
608 """
609 sstore = ssconf.SimpleStore()
610
611 old_master, _ = ssconf.GetMasterAndMyself(sstore)
612
613 return old_master
614
615
617 """Check the agreement on who is the master.
618
619 This function will return a list of (node, number of votes), ordered
620 by the number of votes. Errors will be denoted by the key 'None'.
621
622 Note that the sum of votes is the number of nodes this machine
623 knows, whereas the number of entries in the list could be different
624 (if some nodes vote for another master).
625
626 We remove ourselves from the list since we know that (bugs aside)
627 since we use the same source for configuration information for both
628 backend and boostrap, we'll always vote for ourselves.
629
630 @type node_list: list
631 @param node_list: the list of nodes to query for master info; the current
632 node will be removed if it is in the list
633 @rtype: list
634 @return: list of (node, votes)
635
636 """
637 myself = utils.HostInfo().name
638 try:
639 node_list.remove(myself)
640 except ValueError:
641 pass
642 if not node_list:
643
644 return []
645 results = rpc.RpcRunner.call_master_info(node_list)
646 if not isinstance(results, dict):
647
648 logging.critical("Can't complete rpc call, aborting master startup")
649 return [(None, len(node_list))]
650 votes = {}
651 for node in results:
652 nres = results[node]
653 data = nres.payload
654 msg = nres.fail_msg
655 fail = False
656 if msg:
657 logging.warning("Error contacting node %s: %s", node, msg)
658 fail = True
659 elif not isinstance(data, (tuple, list)) or len(data) < 3:
660 logging.warning("Invalid data received from node %s: %s", node, data)
661 fail = True
662 if fail:
663 if None not in votes:
664 votes[None] = 0
665 votes[None] += 1
666 continue
667 master_node = data[2]
668 if master_node not in votes:
669 votes[master_node] = 0
670 votes[master_node] += 1
671
672 vote_list = [v for v in votes.items()]
673
674
675
676 vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)
677
678 return vote_list
679