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,
102 vg_name=None, beparams=None, hvparams=None,
103 enabled_hypervisors=None, default_hypervisor=None):
104 """Initialise the cluster.
107 if config.ConfigWriter.IsCluster():
108 raise errors.OpPrereqError("Cluster is already initialised")
110 hostname = utils.HostInfo()
112 if hostname.ip.startswith("127."):
113 raise errors.OpPrereqError("This host's IP resolves to the private"
114 " range (%s). Please fix DNS or %s." %
115 (hostname.ip, constants.ETC_HOSTS))
117 if not utils.OwnIpAddress(hostname.ip):
118 raise errors.OpPrereqError("Inconsistency: this host's name resolves"
119 " to %s,\nbut this ip address does not"
120 " belong to this host."
121 " Aborting." % hostname.ip)
123 clustername = utils.HostInfo(cluster_name)
125 if utils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT,
127 raise errors.OpPrereqError("Cluster IP already active. Aborting.")
130 if not utils.IsValidIP(secondary_ip):
131 raise errors.OpPrereqError("Invalid secondary ip given")
132 if (secondary_ip != hostname.ip and
133 not utils.OwnIpAddress(secondary_ip)):
134 raise errors.OpPrereqError("You gave %s as secondary IP,"
135 " but it does not belong to this host." %
138 secondary_ip = hostname.ip
140 if vg_name is not None:
141 # Check if volume group is valid
142 vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,
143 constants.MIN_VG_SIZE)
145 raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"
146 " you are not using lvm" % vgstatus)
148 file_storage_dir = os.path.normpath(file_storage_dir)
150 if not os.path.isabs(file_storage_dir):
151 raise errors.OpPrereqError("The file storage directory you passed is"
152 " not an absolute path.")
154 if not os.path.exists(file_storage_dir):
156 os.makedirs(file_storage_dir, 0750)
158 raise errors.OpPrereqError("Cannot create file storage directory"
160 (file_storage_dir, err))
162 if not os.path.isdir(file_storage_dir):
163 raise errors.OpPrereqError("The file storage directory '%s' is not"
164 " a directory." % file_storage_dir)
166 if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):
167 raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix)
169 result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])
171 raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %
173 result.output.strip()))
175 if not (os.path.isfile(constants.NODE_INITD_SCRIPT) and
176 os.access(constants.NODE_INITD_SCRIPT, os.X_OK)):
177 raise errors.OpPrereqError("Init.d script '%s' missing or not"
178 " executable." % constants.NODE_INITD_SCRIPT)
180 # set up the inter-node password and certificate
181 _InitGanetiServerSetup()
183 # set up ssh config and /etc/hosts
184 f = open(constants.SSH_HOST_RSA_PUB, 'r')
189 sshkey = sshline.split(" ")[1]
191 utils.AddHostToEtcHosts(hostname.name)
192 _InitSSHSetup(hostname.name)
194 # init of cluster config file
195 cluster_config = objects.Cluster(
197 rsahostkeypub=sshkey,
198 highest_used_port=(constants.FIRST_DRBD_PORT - 1),
199 mac_prefix=mac_prefix,
200 volume_group_name=vg_name,
201 default_bridge=def_bridge,
202 tcpudp_port_pool=set(),
203 master_node=hostname.name,
204 master_ip=clustername.ip,
205 master_netdev=master_netdev,
206 cluster_name=clustername.name,
207 file_storage_dir=file_storage_dir,
208 enabled_hypervisors=enabled_hypervisors,
209 default_hypervisor=default_hypervisor,
210 beparams={constants.BEGR_DEFAULT: beparams},
213 master_node_config = objects.Node(name=hostname.name,
214 primary_ip=hostname.ip,
215 secondary_ip=secondary_ip,
218 cfg = InitConfig(constants.CONFIG_VERSION,
219 cluster_config, master_node_config)
220 ssh.WriteKnownHostsFile(cfg, constants.SSH_KNOWN_HOSTS_FILE)
222 # start the master ip
223 # TODO: Review rpc call from bootstrap
224 rpc.RpcRunner.call_node_start_master(hostname.name, True)
227 def InitConfig(version, cluster_config, master_node_config,
228 cfg_file=constants.CLUSTER_CONF_FILE):
229 """Create the initial cluster configuration.
231 It will contain the current node, which will also be the master
232 node, and no instances.
235 @param version: Configuration version
236 @type cluster_config: objects.Cluster
237 @param cluster_config: Cluster configuration
238 @type master_node_config: objects.Node
239 @param master_node_config: Master node configuration
240 @type file_name: string
241 @param file_name: Configuration file path
243 @rtype: ssconf.SimpleConfigWriter
244 @returns: Initialized config instance
248 master_node_config.name: master_node_config,
251 config_data = objects.ConfigData(version=version,
252 cluster=cluster_config,
256 cfg = ssconf.SimpleConfigWriter.FromDict(config_data.ToDict(), cfg_file)
262 def FinalizeClusterDestroy(master):
263 """Execute the last steps of cluster destroy
265 This function shuts down all the daemons, completing the destroy
266 begun in cmdlib.LUDestroyOpcode.
269 if not rpc.RpcRunner.call_node_stop_master(master, True):
270 logging.warning("Could not disable the master role")
271 if not rpc.RpcRunner.call_node_leave_cluster(master):
272 logging.warning("Could not shutdown the node daemon and cleanup the node")
275 def SetupNodeDaemon(cluster_name, node, ssh_key_check):
276 """Add a node to the cluster.
278 This function must be called before the actual opcode, and will ssh
279 to the remote node, copy the needed files, and start ganeti-noded,
280 allowing the master to do the rest via normal rpc calls.
282 @param cluster_name: the cluster name
283 @param node: the name of the new node
284 @param ssh_key_check: whether to do a strict key check
287 sshrunner = ssh.SshRunner(cluster_name)
288 gntpem = utils.ReadFile(constants.SSL_CERT_FILE)
289 # in the base64 pem encoding, neither '!' nor '.' are valid chars,
290 # so we use this to detect an invalid certificate; as long as the
291 # cert doesn't contain this, the here-document will be correctly
292 # parsed by the shell sequence below
293 if re.search('^!EOF\.', gntpem, re.MULTILINE):
294 raise errors.OpExecError("invalid PEM encoding in the SSL certificate")
295 if not gntpem.endswith("\n"):
296 raise errors.OpExecError("PEM must end with newline")
298 # set up inter-node password and certificate and restarts the node daemon
299 # and then connect with ssh to set password and start ganeti-noded
300 # note that all the below variables are sanitized at this point,
301 # either by being constants or by the checks above
302 mycommand = ("umask 077 && "
303 "cat > '%s' << '!EOF.' && \n"
304 "%s!EOF.\n%s restart" %
305 (constants.SSL_CERT_FILE, gntpem,
306 constants.NODE_INITD_SCRIPT))
308 result = sshrunner.Run(node, 'root', mycommand, batch=False,
309 ask_key=ssh_key_check,
310 use_cluster_key=False,
311 strict_host_check=ssh_key_check)
313 raise errors.OpExecError("Remote command on node %s, error: %s,"
315 (node, result.fail_reason, result.output))
318 def MasterFailover():
319 """Failover the master node.
321 This checks that we are not already the master, and will cause the
322 current master to cease being master, and the non-master to become
326 sstore = ssconf.SimpleStore()
328 old_master, new_master = ssconf.GetMasterAndMyself(sstore)
329 node_list = sstore.GetNodeList()
330 mc_list = sstore.GetMasterCandidates()
332 if old_master == new_master:
333 raise errors.OpPrereqError("This commands must be run on the node"
334 " where you want the new master to be."
335 " %s is already the master" %
338 if new_master not in mc_list:
339 mc_no_master = [name for name in mc_list if name != old_master]
340 raise errors.OpPrereqError("This node is not among the nodes marked"
341 " as master candidates. Only these nodes"
342 " can become masters. Current list of"
343 " master candidates is:\n"
344 "%s" % ('\n'.join(mc_no_master)))
346 vote_list = GatherMasterVotes(node_list)
349 voted_master = vote_list[0][0]
350 if voted_master is None:
351 raise errors.OpPrereqError("Cluster is inconsistent, most nodes did not"
353 elif voted_master != old_master:
354 raise errors.OpPrereqError("I have wrong configuration, I believe the"
355 " master is %s but the other nodes voted for"
356 " %s. Please resync the configuration of"
357 " this node." % (old_master, voted_master))
362 logging.info("Setting master to %s, old master: %s", new_master, old_master)
364 if not rpc.RpcRunner.call_node_stop_master(old_master, True):
365 logging.error("Could not disable the master role on the old master"
366 " %s, please disable manually", old_master)
368 # Here we have a phase where no master should be running
370 # instantiate a real config writer, as we now know we have the
372 cfg = config.ConfigWriter()
374 cluster_info = cfg.GetClusterInfo()
375 cluster_info.master_node = new_master
376 # this will also regenerate the ssconf files, since we updated the
378 cfg.Update(cluster_info)
380 if not rpc.RpcRunner.call_node_start_master(new_master, True):
381 logging.error("Could not start the master role on the new master"
382 " %s, please check", new_master)
388 def GatherMasterVotes(node_list):
389 """Check the agreement on who is the master.
391 This function will return a list of (node, number of votes), ordered
392 by the number of votes. Errors will be denoted by the key 'None'.
394 Note that the sum of votes is the number of nodes this machine
395 knows, whereas the number of entries in the list could be different
396 (if some nodes vote for another master).
398 We remove ourselves from the list since we know that (bugs aside)
399 since we use the same source for configuration information for both
400 backend and boostrap, we'll always vote for ourselves.
402 @type node_list: list
403 @param node_list: the list of nodes to query for master info; the current
404 node wil be removed if it is in the list
406 @return: list of (node, votes)
409 myself = utils.HostInfo().name
411 node_list.remove(myself)
415 # no nodes left (eventually after removing myself)
417 results = rpc.RpcRunner.call_master_info(node_list)
418 if not isinstance(results, dict):
419 # this should not happen (unless internal error in rpc)
420 logging.critical("Can't complete rpc call, aborting master startup")
421 return [(None, len(node_list))]
422 positive = negative = 0
426 if not isinstance(results[node], (tuple, list)) or len(results[node]) < 3:
427 # here the rpc layer should have already logged errors
428 if None not in votes:
432 master_node = results[node][2]
433 if master_node not in votes:
434 votes[master_node] = 0
435 votes[master_node] += 1
437 vote_list = [v for v in votes.items()]
438 # sort first on number of votes then on name, since we want None
439 # sorted later if we have the half of the nodes not responding, and
440 # half voting all for the same master
441 vote_list.sort(key=lambda x: (x[1], x[0]), reverse=True)