4 # Copyright (C) 2006, 2007, 2008 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 hypervisor
44 """Setup the SSH configuration for the cluster.
46 This generates a dsa keypair for root, adds the pub key to the
47 permitted hosts and adds the hostkey to its own known hosts.
50 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
52 for name in priv_key, pub_key:
53 if os.path.exists(name):
54 utils.CreateBackup(name)
55 utils.RemoveFile(name)
57 result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
61 raise errors.OpExecError("Could not generate ssh keypair, error %s" %
64 f = open(pub_key, 'r')
66 utils.AddAuthorizedKey(auth_keys, f.read(8192))
71 def _GenerateSelfSignedSslCert(file_name, validity=(365 * 5)):
72 """Generates a self-signed SSL certificate.
75 @param file_name: Path to output file
77 @param validity: Validity for certificate in days
80 (fd, tmp_file_name) = tempfile.mkstemp(dir=os.path.dirname(file_name))
82 # Set permissions before writing key
83 os.chmod(tmp_file_name, 0600)
85 result = utils.RunCmd(["openssl", "req", "-new", "-newkey", "rsa:1024",
86 "-days", str(validity), "-nodes", "-x509",
87 "-keyout", tmp_file_name, "-out", tmp_file_name,
90 raise errors.OpExecError("Could not generate SSL certificate, command"
91 " %s had exitcode %s and error message %s" %
92 (result.cmd, result.exit_code, result.output))
95 os.chmod(tmp_file_name, 0400)
97 os.rename(tmp_file_name, file_name)
99 utils.RemoveFile(tmp_file_name)
102 def _InitGanetiServerSetup():
103 """Setup the necessary configuration for the initial node daemon.
105 This creates the nodepass file containing the shared password for
106 the cluster and also generates the SSL certificate.
109 _GenerateSelfSignedSslCert(constants.SSL_CERT_FILE)
111 # Don't overwrite existing file
112 if not os.path.exists(constants.RAPI_CERT_FILE):
113 _GenerateSelfSignedSslCert(constants.RAPI_CERT_FILE)
115 result = utils.RunCmd([constants.NODE_INITD_SCRIPT, "restart"])
118 raise errors.OpExecError("Could not start the node daemon, command %s"
119 " had exitcode %s and error %s" %
120 (result.cmd, result.exit_code, result.output))
123 def InitCluster(cluster_name, mac_prefix,
124 master_netdev, file_storage_dir, candidate_pool_size,
125 secondary_ip=None, vg_name=None, beparams=None,
126 nicparams=None, hvparams=None, enabled_hypervisors=None,
127 default_hypervisor=None, modify_etc_hosts=True):
128 """Initialise the cluster.
130 @type candidate_pool_size: int
131 @param candidate_pool_size: master candidate pool size
134 # TODO: complete the docstring
135 if config.ConfigWriter.IsCluster():
136 raise errors.OpPrereqError("Cluster is already initialised")
138 hostname = utils.HostInfo()
140 if hostname.ip.startswith("127."):
141 raise errors.OpPrereqError("This host's IP resolves to the private"
142 " range (%s). Please fix DNS or %s." %
143 (hostname.ip, constants.ETC_HOSTS))
145 if not utils.OwnIpAddress(hostname.ip):
146 raise errors.OpPrereqError("Inconsistency: this host's name resolves"
147 " to %s,\nbut this ip address does not"
148 " belong to this host."
149 " Aborting." % hostname.ip)
151 clustername = utils.HostInfo(cluster_name)
153 if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
155 raise errors.OpPrereqError("Cluster IP already active. Aborting.")
158 if not utils.IsValidIP(secondary_ip):
159 raise errors.OpPrereqError("Invalid secondary ip given")
160 if (secondary_ip != hostname.ip and
161 not utils.OwnIpAddress(secondary_ip)):
162 raise errors.OpPrereqError("You gave %s as secondary IP,"
163 " but it does not belong to this host." %
166 secondary_ip = hostname.ip
168 if vg_name is not None:
169 # Check if volume group is valid
170 vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
171 constants.MIN_VG_SIZE)
173 raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
174 " you are not using lvm" % vgstatus)
176 file_storage_dir = os.path.normpath(file_storage_dir)
178 if not os.path.isabs(file_storage_dir):
179 raise errors.OpPrereqError("The file storage directory you passed is"
180 " not an absolute path.")
182 if not os.path.exists(file_storage_dir):
184 os.makedirs(file_storage_dir, 0750)
186 raise errors.OpPrereqError("Cannot create file storage directory"
188 (file_storage_dir, err))
190 if not os.path.isdir(file_storage_dir):
191 raise errors.OpPrereqError("The file storage directory '%s' is not"
192 " a directory." % file_storage_dir)
194 if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
195 raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix)
197 result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
199 raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
201 result.output.strip()))
203 if not (os.path.isfile(constants.NODE_INITD_SCRIPT) and
204 os.access(constants.NODE_INITD_SCRIPT, os.X_OK)):
205 raise errors.OpPrereqError("Init.d script '%s' missing or not"
206 " executable." % constants.NODE_INITD_SCRIPT)
208 dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE)]
209 utils.EnsureDirs(dirs)
211 utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
212 utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)
213 objects.NIC.CheckParameterSyntax(nicparams)
215 # hvparams is a mapping of hypervisor->hvparams dict
216 for hv_name, hv_params in hvparams.iteritems():
217 utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
218 hv_class = hypervisor.GetHypervisor(hv_name)
219 hv_class.CheckParameterSyntax(hv_params)
221 # set up the inter-node password and certificate
222 _InitGanetiServerSetup()
224 # set up ssh config and /etc/hosts
225 f = open(constants.SSH_HOST_RSA_PUB, 'r')
230 sshkey = sshline.split(" ")[1]
233 utils.AddHostToEtcHosts(hostname.name)
237 # init of cluster config file
238 cluster_config = objects.Cluster(
240 rsahostkeypub=sshkey,
241 highest_used_port=(constants.FIRST_DRBD_PORT - 1),
242 mac_prefix=mac_prefix,
243 volume_group_name=vg_name,
244 tcpudp_port_pool=set(),
245 master_node=hostname.name,
246 master_ip=clustername.ip,
247 master_netdev=master_netdev,
248 cluster_name=clustername.name,
249 file_storage_dir=file_storage_dir,
250 enabled_hypervisors=enabled_hypervisors,
251 default_hypervisor=default_hypervisor,
252 beparams={constants.PP_DEFAULT: beparams},
253 nicparams={constants.PP_DEFAULT: nicparams},
255 candidate_pool_size=candidate_pool_size,
256 modify_etc_hosts=modify_etc_hosts,
258 master_node_config = objects.Node(name=hostname.name,
259 primary_ip=hostname.ip,
260 secondary_ip=secondary_ip,
262 master_candidate=True,
263 offline=False, drained=False,
266 sscfg = InitConfig(constants.CONFIG_VERSION,
267 cluster_config, master_node_config)
268 ssh.WriteKnownHostsFile(sscfg, constants.SSH_KNOWN_HOSTS_FILE)
269 cfg = config.ConfigWriter()
270 cfg.Update(cfg.GetClusterInfo())
272 # start the master ip
273 # TODO: Review rpc call from bootstrap
274 # TODO: Warn on failed start master
275 rpc.RpcRunner.call_node_start_master(hostname.name, True)
278 def InitConfig(version, cluster_config, master_node_config,
279 cfg_file=constants.CLUSTER_CONF_FILE):
280 """Create the initial cluster configuration.
282 It will contain the current node, which will also be the master
283 node, and no instances.
286 @param version: configuration version
287 @type cluster_config: L{objects.Cluster}
288 @param cluster_config: cluster configuration
289 @type master_node_config: L{objects.Node}
290 @param master_node_config: master node configuration
291 @type cfg_file: string
292 @param cfg_file: configuration file path
294 @rtype: L{ssconf.SimpleConfigWriter}
295 @return: initialized config instance
299 master_node_config.name: master_node_config,
302 config_data = objects.ConfigData(version=version,
303 cluster=cluster_config,
307 cfg = ssconf.SimpleConfigWriter.FromDict(config_data.ToDict(), cfg_file)
313 def FinalizeClusterDestroy(master):
314 """Execute the last steps of cluster destroy
316 This function shuts down all the daemons, completing the destroy
317 begun in cmdlib.LUDestroyOpcode.
320 result = rpc.RpcRunner.call_node_stop_master(master, True)
321 msg = result.RemoteFailMsg()
323 logging.warning("Could not disable the master role: %s" % msg)
324 result = rpc.RpcRunner.call_node_leave_cluster(master)
325 if result.failed or not result.data:
326 logging.warning("Could not shutdown the node daemon and cleanup the node")
329 def SetupNodeDaemon(cluster_name, node, ssh_key_check):
330 """Add a node to the cluster.
332 This function must be called before the actual opcode, and will ssh
333 to the remote node, copy the needed files, and start ganeti-noded,
334 allowing the master to do the rest via normal rpc calls.
336 @param cluster_name: the cluster name
337 @param node: the name of the new node
338 @param ssh_key_check: whether to do a strict key check
341 sshrunner = ssh.SshRunner(cluster_name)
343 noded_cert = utils.ReadFile(constants.SSL_CERT_FILE)
344 rapi_cert = utils.ReadFile(constants.RAPI_CERT_FILE)
346 # in the base64 pem encoding, neither '!' nor '.' are valid chars,
347 # so we use this to detect an invalid certificate; as long as the
348 # cert doesn't contain this, the here-document will be correctly
349 # parsed by the shell sequence below
350 if (re.search('^!EOF\.', noded_cert, re.MULTILINE) or
351 re.search('^!EOF\.', rapi_cert, re.MULTILINE)):
352 raise errors.OpExecError("invalid PEM encoding in the SSL certificate")
354 if not noded_cert.endswith("\n"):
356 if not rapi_cert.endswith("\n"):
359 # set up inter-node password and certificate and restarts the node daemon
360 # and then connect with ssh to set password and start ganeti-noded
361 # note that all the below variables are sanitized at this point,
362 # either by being constants or by the checks above
363 mycommand = ("umask 077 && "
364 "cat > '%s' << '!EOF.' && \n"
366 "cat > '%s' << '!EOF.' && \n"
368 "chmod 0400 %s %s && "
370 (constants.SSL_CERT_FILE, noded_cert,
371 constants.RAPI_CERT_FILE, rapi_cert,
372 constants.SSL_CERT_FILE, constants.RAPI_CERT_FILE,
373 constants.NODE_INITD_SCRIPT))
375 result = sshrunner.Run(node, 'root', mycommand, batch=False,
376 ask_key=ssh_key_check,
377 use_cluster_key=False,
378 strict_host_check=ssh_key_check)
380 raise errors.OpExecError("Remote command on node %s, error: %s,"
382 (node, result.fail_reason, result.output))
385 def MasterFailover():
386 """Failover the master node.
388 This checks that we are not already the master, and will cause the
389 current master to cease being master, and the non-master to become
393 sstore = ssconf.SimpleStore()
395 old_master, new_master = ssconf.GetMasterAndMyself(sstore)
396 node_list = sstore.GetNodeList()
397 mc_list = sstore.GetMasterCandidates()
399 if old_master == new_master:
400 raise errors.OpPrereqError("This commands must be run on the node"
401 " where you want the new master to be."
402 " %s is already the master" %
405 if new_master not in mc_list:
406 mc_no_master = [name for name in mc_list if name != old_master]
407 raise errors.OpPrereqError("This node is not among the nodes marked"
408 " as master candidates. Only these nodes"
409 " can become masters. Current list of"
410 " master candidates is:\n"
411 "%s" % ('\n'.join(mc_no_master)))
413 vote_list = GatherMasterVotes(node_list)
416 voted_master = vote_list[0][0]
417 if voted_master is None:
418 raise errors.OpPrereqError("Cluster is inconsistent, most nodes did not"
420 elif voted_master != old_master:
421 raise errors.OpPrereqError("I have wrong configuration, I believe the"
422 " master is %s but the other nodes voted for"
423 " %s. Please resync the configuration of"
424 " this node." % (old_master, voted_master))
429 logging.info("Setting master to %s, old master: %s", new_master, old_master)
431 result = rpc.RpcRunner.call_node_stop_master(old_master, True)
432 msg = result.RemoteFailMsg()
434 logging.error("Could not disable the master role on the old master"
435 " %s, please disable manually: %s", old_master, msg)
437 # Here we have a phase where no master should be running
439 # instantiate a real config writer, as we now know we have the
441 cfg = config.ConfigWriter()
443 cluster_info = cfg.GetClusterInfo()
444 cluster_info.master_node = new_master
445 # this will also regenerate the ssconf files, since we updated the
447 cfg.Update(cluster_info)
449 result = rpc.RpcRunner.call_node_start_master(new_master, True)
450 msg = result.RemoteFailMsg()
452 logging.error("Could not start the master role on the new master"
453 " %s, please check: %s", new_master, msg)
460 """Returns the current master node.
462 This is a separate function in bootstrap since it's needed by
463 gnt-cluster, and instead of importing directly ssconf, it's better
464 to abstract it in bootstrap, where we do use ssconf in other
468 sstore = ssconf.SimpleStore()
470 old_master, _ = ssconf.GetMasterAndMyself(sstore)
475 def GatherMasterVotes(node_list):
476 """Check the agreement on who is the master.
478 This function will return a list of (node, number of votes), ordered
479 by the number of votes. Errors will be denoted by the key 'None'.
481 Note that the sum of votes is the number of nodes this machine
482 knows, whereas the number of entries in the list could be different
483 (if some nodes vote for another master).
485 We remove ourselves from the list since we know that (bugs aside)
486 since we use the same source for configuration information for both
487 backend and boostrap, we'll always vote for ourselves.
489 @type node_list: list
490 @param node_list: the list of nodes to query for master info; the current
491 node wil be removed if it is in the list
493 @return: list of (node, votes)
496 myself = utils.HostInfo().name
498 node_list.remove(myself)
502 # no nodes left (eventually after removing myself)
504 results = rpc.RpcRunner.call_master_info(node_list)
505 if not isinstance(results, dict):
506 # this should not happen (unless internal error in rpc)
507 logging.critical("Can't complete rpc call, aborting master startup")
508 return [(None, len(node_list))]
513 if nres.failed or not isinstance(data, (tuple, list)) or len(data) < 3:
514 # here the rpc layer should have already logged errors
515 if None not in votes:
519 master_node = data[2]
520 if master_node not in votes:
521 votes[master_node] = 0
522 votes[master_node] += 1
524 vote_list = [v for v in votes.items()]
525 # sort first on number of votes then on name, since we want None
526 # sorted later if we have the half of the nodes not responding, and
527 # half voting all for the same master
528 vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)