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
41 def _InitSSHSetup(node):
42 """Setup the SSH configuration for the cluster.
45 This generates a dsa keypair for root, adds the pub key to the
46 permitted hosts and adds the hostkey to its own known hosts.
49 node: the name of this host as a fqdn
52 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
54 for name in priv_key, pub_key:
55 if os.path.exists(name):
56 utils.CreateBackup(name)
57 utils.RemoveFile(name)
59 result = utils.RunCmd(["ssh-keygen", "-t", "dsa",
63 raise errors.OpExecError("Could not generate ssh keypair, error %s" %
66 f = open(pub_key, 'r')
68 utils.AddAuthorizedKey(auth_keys, f.read(8192))
73 def _InitGanetiServerSetup():
74 """Setup the necessary configuration for the initial node daemon.
76 This creates the nodepass file containing the shared password for
77 the cluster and also generates the SSL certificate.
80 result = utils.RunCmd(["openssl", "req", "-new", "-newkey", "rsa:1024",
81 "-days", str(365*5), "-nodes", "-x509",
82 "-keyout", constants.SSL_CERT_FILE,
83 "-out", constants.SSL_CERT_FILE, "-batch"])
85 raise errors.OpExecError("could not generate server ssl cert, command"
86 " %s had exitcode %s and error message %s" %
87 (result.cmd, result.exit_code, result.output))
89 os.chmod(constants.SSL_CERT_FILE, 0400)
91 result = utils.RunCmd([constants.NODE_INITD_SCRIPT, "restart"])
94 raise errors.OpExecError("Could not start the node daemon, command %s"
95 " had exitcode %s and error %s" %
96 (result.cmd, result.exit_code, result.output))
99 def InitCluster(cluster_name, mac_prefix, def_bridge,
100 master_netdev, file_storage_dir, candidate_pool_size,
101 secondary_ip=None, vg_name=None, beparams=None, hvparams=None,
102 enabled_hypervisors=None, default_hypervisor=None):
103 """Initialise the cluster.
105 @type candidate_pool_size: int
106 @param candidate_pool_size: master candidate pool size
109 # TODO: complete the docstring
110 if config.ConfigWriter.IsCluster():
111 raise errors.OpPrereqError("Cluster is already initialised")
113 hostname = utils.HostInfo()
115 if hostname.ip.startswith("127."):
116 raise errors.OpPrereqError("This host's IP resolves to the private"
117 " range (%s). Please fix DNS or %s." %
118 (hostname.ip, constants.ETC_HOSTS))
120 if not utils.OwnIpAddress(hostname.ip):
121 raise errors.OpPrereqError("Inconsistency: this host's name resolves"
122 " to %s,\nbut this ip address does not"
123 " belong to this host."
124 " Aborting." % hostname.ip)
126 clustername = utils.HostInfo(cluster_name)
128 if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
130 raise errors.OpPrereqError("Cluster IP already active. Aborting.")
133 if not utils.IsValidIP(secondary_ip):
134 raise errors.OpPrereqError("Invalid secondary ip given")
135 if (secondary_ip != hostname.ip and
136 not utils.OwnIpAddress(secondary_ip)):
137 raise errors.OpPrereqError("You gave %s as secondary IP,"
138 " but it does not belong to this host." %
141 secondary_ip = hostname.ip
143 if vg_name is not None:
144 # Check if volume group is valid
145 vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
146 constants.MIN_VG_SIZE)
148 raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
149 " you are not using lvm" % vgstatus)
151 file_storage_dir = os.path.normpath(file_storage_dir)
153 if not os.path.isabs(file_storage_dir):
154 raise errors.OpPrereqError("The file storage directory you passed is"
155 " not an absolute path.")
157 if not os.path.exists(file_storage_dir):
159 os.makedirs(file_storage_dir, 0750)
161 raise errors.OpPrereqError("Cannot create file storage directory"
163 (file_storage_dir, err))
165 if not os.path.isdir(file_storage_dir):
166 raise errors.OpPrereqError("The file storage directory '%s' is not"
167 " a directory." % file_storage_dir)
169 if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
170 raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix)
172 result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
174 raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
176 result.output.strip()))
178 if not (os.path.isfile(constants.NODE_INITD_SCRIPT) and
179 os.access(constants.NODE_INITD_SCRIPT, os.X_OK)):
180 raise errors.OpPrereqError("Init.d script '%s' missing or not"
181 " executable." % constants.NODE_INITD_SCRIPT)
183 utils.CheckBEParams(beparams)
185 # set up the inter-node password and certificate
186 _InitGanetiServerSetup()
188 # set up ssh config and /etc/hosts
189 f = open(constants.SSH_HOST_RSA_PUB, 'r')
194 sshkey = sshline.split(" ")[1]
196 utils.AddHostToEtcHosts(hostname.name)
197 _InitSSHSetup(hostname.name)
199 # init of cluster config file
200 cluster_config = objects.Cluster(
202 rsahostkeypub=sshkey,
203 highest_used_port=(constants.FIRST_DRBD_PORT - 1),
204 mac_prefix=mac_prefix,
205 volume_group_name=vg_name,
206 default_bridge=def_bridge,
207 tcpudp_port_pool=set(),
208 master_node=hostname.name,
209 master_ip=clustername.ip,
210 master_netdev=master_netdev,
211 cluster_name=clustername.name,
212 file_storage_dir=file_storage_dir,
213 enabled_hypervisors=enabled_hypervisors,
214 default_hypervisor=default_hypervisor,
215 beparams={constants.BEGR_DEFAULT: beparams},
217 candidate_pool_size=candidate_pool_size,
219 master_node_config = objects.Node(name=hostname.name,
220 primary_ip=hostname.ip,
221 secondary_ip=secondary_ip,
223 master_candidate=True,
227 sscfg = InitConfig(constants.CONFIG_VERSION,
228 cluster_config, master_node_config)
229 ssh.WriteKnownHostsFile(sscfg, constants.SSH_KNOWN_HOSTS_FILE)
230 cfg = config.ConfigWriter()
231 cfg.Update(cfg.GetClusterInfo())
233 # start the master ip
234 # TODO: Review rpc call from bootstrap
235 rpc.RpcRunner.call_node_start_master(hostname.name, True)
238 def InitConfig(version, cluster_config, master_node_config,
239 cfg_file=constants.CLUSTER_CONF_FILE):
240 """Create the initial cluster configuration.
242 It will contain the current node, which will also be the master
243 node, and no instances.
246 @param version: Configuration version
247 @type cluster_config: objects.Cluster
248 @param cluster_config: Cluster configuration
249 @type master_node_config: objects.Node
250 @param master_node_config: Master node configuration
251 @type file_name: string
252 @param file_name: Configuration file path
254 @rtype: ssconf.SimpleConfigWriter
255 @returns: Initialized config instance
259 master_node_config.name: master_node_config,
262 config_data = objects.ConfigData(version=version,
263 cluster=cluster_config,
267 cfg = ssconf.SimpleConfigWriter.FromDict(config_data.ToDict(), cfg_file)
273 def FinalizeClusterDestroy(master):
274 """Execute the last steps of cluster destroy
276 This function shuts down all the daemons, completing the destroy
277 begun in cmdlib.LUDestroyOpcode.
280 result = rpc.RpcRunner.call_node_stop_master(master, True)
281 if result.failed or not result.data:
282 logging.warning("Could not disable the master role")
283 result = rpc.RpcRunner.call_node_leave_cluster(master)
284 if result.failed or not result.data:
285 logging.warning("Could not shutdown the node daemon and cleanup the node")
288 def SetupNodeDaemon(cluster_name, node, ssh_key_check):
289 """Add a node to the cluster.
291 This function must be called before the actual opcode, and will ssh
292 to the remote node, copy the needed files, and start ganeti-noded,
293 allowing the master to do the rest via normal rpc calls.
295 @param cluster_name: the cluster name
296 @param node: the name of the new node
297 @param ssh_key_check: whether to do a strict key check
300 sshrunner = ssh.SshRunner(cluster_name)
301 gntpem = utils.ReadFile(constants.SSL_CERT_FILE)
302 # in the base64 pem encoding, neither '!' nor '.' are valid chars,
303 # so we use this to detect an invalid certificate; as long as the
304 # cert doesn't contain this, the here-document will be correctly
305 # parsed by the shell sequence below
306 if re.search('^!EOF\.', gntpem, re.MULTILINE):
307 raise errors.OpExecError("invalid PEM encoding in the SSL certificate")
308 if not gntpem.endswith("\n"):
309 raise errors.OpExecError("PEM must end with newline")
311 # set up inter-node password and certificate and restarts the node daemon
312 # and then connect with ssh to set password and start ganeti-noded
313 # note that all the below variables are sanitized at this point,
314 # either by being constants or by the checks above
315 mycommand = ("umask 077 && "
316 "cat > '%s' << '!EOF.' && \n"
317 "%s!EOF.\n%s restart" %
318 (constants.SSL_CERT_FILE, gntpem,
319 constants.NODE_INITD_SCRIPT))
321 result = sshrunner.Run(node, 'root', mycommand, batch=False,
322 ask_key=ssh_key_check,
323 use_cluster_key=False,
324 strict_host_check=ssh_key_check)
326 raise errors.OpExecError("Remote command on node %s, error: %s,"
328 (node, result.fail_reason, result.output))
331 def MasterFailover():
332 """Failover the master node.
334 This checks that we are not already the master, and will cause the
335 current master to cease being master, and the non-master to become
339 sstore = ssconf.SimpleStore()
341 old_master, new_master = ssconf.GetMasterAndMyself(sstore)
342 node_list = sstore.GetNodeList()
343 mc_list = sstore.GetMasterCandidates()
345 if old_master == new_master:
346 raise errors.OpPrereqError("This commands must be run on the node"
347 " where you want the new master to be."
348 " %s is already the master" %
351 if new_master not in mc_list:
352 mc_no_master = [name for name in mc_list if name != old_master]
353 raise errors.OpPrereqError("This node is not among the nodes marked"
354 " as master candidates. Only these nodes"
355 " can become masters. Current list of"
356 " master candidates is:\n"
357 "%s" % ('\n'.join(mc_no_master)))
359 vote_list = GatherMasterVotes(node_list)
362 voted_master = vote_list[0][0]
363 if voted_master is None:
364 raise errors.OpPrereqError("Cluster is inconsistent, most nodes did not"
366 elif voted_master != old_master:
367 raise errors.OpPrereqError("I have wrong configuration, I believe the"
368 " master is %s but the other nodes voted for"
369 " %s. Please resync the configuration of"
370 " this node." % (old_master, voted_master))
375 logging.info("Setting master to %s, old master: %s", new_master, old_master)
377 result = rpc.RpcRunner.call_node_stop_master(old_master, True)
378 if result.failed or not result.data:
379 logging.error("Could not disable the master role on the old master"
380 " %s, please disable manually", old_master)
382 # Here we have a phase where no master should be running
384 # instantiate a real config writer, as we now know we have the
386 cfg = config.ConfigWriter()
388 cluster_info = cfg.GetClusterInfo()
389 cluster_info.master_node = new_master
390 # this will also regenerate the ssconf files, since we updated the
392 cfg.Update(cluster_info)
394 result = rpc.RpcRunner.call_node_start_master(new_master, True)
395 if result.failed or not result.data:
396 logging.error("Could not start the master role on the new master"
397 " %s, please check", new_master)
403 def GatherMasterVotes(node_list):
404 """Check the agreement on who is the master.
406 This function will return a list of (node, number of votes), ordered
407 by the number of votes. Errors will be denoted by the key 'None'.
409 Note that the sum of votes is the number of nodes this machine
410 knows, whereas the number of entries in the list could be different
411 (if some nodes vote for another master).
413 We remove ourselves from the list since we know that (bugs aside)
414 since we use the same source for configuration information for both
415 backend and boostrap, we'll always vote for ourselves.
417 @type node_list: list
418 @param node_list: the list of nodes to query for master info; the current
419 node wil be removed if it is in the list
421 @return: list of (node, votes)
424 myself = utils.HostInfo().name
426 node_list.remove(myself)
430 # no nodes left (eventually after removing myself)
432 results = rpc.RpcRunner.call_master_info(node_list)
433 if not isinstance(results, dict):
434 # this should not happen (unless internal error in rpc)
435 logging.critical("Can't complete rpc call, aborting master startup")
436 return [(None, len(node_list))]
437 positive = negative = 0
443 if nres.failed or not isinstance(data, (tuple, list)) or len(data) < 3:
444 # here the rpc layer should have already logged errors
445 if None not in votes:
449 master_node = data[2]
450 if master_node not in votes:
451 votes[master_node] = 0
452 votes[master_node] += 1
454 vote_list = [v for v in votes.items()]
455 # sort first on number of votes then on name, since we want None
456 # sorted later if we have the half of the nodes not responding, and
457 # half voting all for the same master
458 vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)