4 # Copyright (C) 2006, 2007, 2010, 2011 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 """Master daemon program.
24 Some classes deviates from the standard style guide since the
25 inheritance from parent classes requires it.
29 # pylint: disable=C0103
30 # C0103: Invalid name ganeti-masterd
41 from optparse import OptionParser
43 from ganeti import config
44 from ganeti import constants
45 from ganeti import daemon
46 from ganeti import mcpu
47 from ganeti import opcodes
48 from ganeti import jqueue
49 from ganeti import locking
50 from ganeti import luxi
51 from ganeti import utils
52 from ganeti import errors
53 from ganeti import ssconf
54 from ganeti import workerpool
55 from ganeti import rpc
56 from ganeti import bootstrap
57 from ganeti import netutils
58 from ganeti import objects
59 from ganeti import query
62 CLIENT_REQUEST_WORKERS = 16
64 EXIT_NOTMASTER = constants.EXIT_NOTMASTER
65 EXIT_NODESETUP_ERROR = constants.EXIT_NODESETUP_ERROR
68 class ClientRequestWorker(workerpool.BaseWorker):
69 # pylint: disable=W0221
70 def RunTask(self, server, message, client):
71 """Process the request.
74 client_ops = ClientOps(server)
77 (method, args, version) = luxi.ParseRequest(message)
78 except luxi.ProtocolError, err:
79 logging.error("Protocol Error: %s", err)
85 # Verify client's version if there was one in the request
86 if version is not None and version != constants.LUXI_VERSION:
87 raise errors.LuxiError("LUXI version mismatch, server %s, request %s" %
88 (constants.LUXI_VERSION, version))
90 result = client_ops.handle_request(method, args)
92 except errors.GenericError, err:
93 logging.exception("Unexpected exception")
95 result = errors.EncodeException(err)
97 logging.exception("Unexpected exception")
99 result = "Caught exception: %s" % str(err[1])
102 reply = luxi.FormatResponse(success, result)
103 client.send_message(reply)
104 # awake the main thread so that it can write out the data.
105 server.awaker.signal()
106 except: # pylint: disable=W0702
107 logging.exception("Send error")
111 class MasterClientHandler(daemon.AsyncTerminatedMessageStream):
112 """Handler for master peers.
117 def __init__(self, server, connected_socket, client_address, family):
118 daemon.AsyncTerminatedMessageStream.__init__(self, connected_socket,
121 family, self._MAX_UNHANDLED)
124 def handle_message(self, message, _):
125 self.server.request_workers.AddTask((self.server, message, self))
128 class MasterServer(daemon.AsyncStreamServer):
131 This is the main asynchronous master server. It handles connections to the
135 family = socket.AF_UNIX
137 def __init__(self, mainloop, address, uid, gid):
138 """MasterServer constructor
140 @type mainloop: ganeti.daemon.Mainloop
141 @param mainloop: Mainloop used to poll for I/O events
142 @param address: the unix socket address to bind the MasterServer to
143 @param uid: The uid of the owner of the socket
144 @param gid: The gid of the owner of the socket
147 temp_name = tempfile.mktemp(dir=os.path.dirname(address))
148 daemon.AsyncStreamServer.__init__(self, self.family, temp_name)
149 os.chmod(temp_name, 0770)
150 os.chown(temp_name, uid, gid)
151 os.rename(temp_name, address)
153 self.mainloop = mainloop
154 self.awaker = daemon.AsyncAwaker()
156 # We'll only start threads once we've forked.
158 self.request_workers = None
160 def handle_connection(self, connected_socket, client_address):
161 # TODO: add connection count and limit the number of open connections to a
162 # maximum number to avoid breaking for lack of file descriptors or memory.
163 MasterClientHandler(self, connected_socket, client_address, self.family)
165 def setup_queue(self):
166 self.context = GanetiContext()
167 self.request_workers = workerpool.WorkerPool("ClientReq",
168 CLIENT_REQUEST_WORKERS,
171 def server_cleanup(self):
172 """Cleanup the server.
174 This involves shutting down the processor threads and the master
181 if self.request_workers:
182 self.request_workers.TerminateWorkers()
184 self.context.jobqueue.Shutdown()
188 """Class holding high-level client operations."""
189 def __init__(self, server):
192 def handle_request(self, method, args): # pylint: disable=R0911
193 queue = self.server.context.jobqueue
195 # TODO: Parameter validation
197 # TODO: Rewrite to not exit in each 'if/elif' branch
199 if method == luxi.REQ_SUBMIT_JOB:
200 logging.info("Received new job")
201 ops = [opcodes.OpCode.LoadOpCode(state) for state in args]
202 return queue.SubmitJob(ops)
204 if method == luxi.REQ_SUBMIT_MANY_JOBS:
205 logging.info("Received multiple jobs")
208 jobs.append([opcodes.OpCode.LoadOpCode(state) for state in ops])
209 return queue.SubmitManyJobs(jobs)
211 elif method == luxi.REQ_CANCEL_JOB:
213 logging.info("Received job cancel request for %s", job_id)
214 return queue.CancelJob(job_id)
216 elif method == luxi.REQ_ARCHIVE_JOB:
218 logging.info("Received job archive request for %s", job_id)
219 return queue.ArchiveJob(job_id)
221 elif method == luxi.REQ_AUTOARCHIVE_JOBS:
222 (age, timeout) = args
223 logging.info("Received job autoarchive request for age %s, timeout %s",
225 return queue.AutoArchiveJobs(age, timeout)
227 elif method == luxi.REQ_WAIT_FOR_JOB_CHANGE:
228 (job_id, fields, prev_job_info, prev_log_serial, timeout) = args
229 logging.info("Received job poll request for %s", job_id)
230 return queue.WaitForJobChanges(job_id, fields, prev_job_info,
231 prev_log_serial, timeout)
233 elif method == luxi.REQ_QUERY:
234 req = objects.QueryRequest.FromDict(args)
236 if req.what in constants.QR_VIA_OP:
237 result = self._Query(opcodes.OpQuery(what=req.what, fields=req.fields,
239 elif req.what == constants.QR_LOCK:
240 if req.filter is not None:
241 raise errors.OpPrereqError("Lock queries can't be filtered")
242 return self.server.context.glm.QueryLocks(req.fields)
243 elif req.what in constants.QR_VIA_LUXI:
244 raise NotImplementedError
246 raise errors.OpPrereqError("Resource type '%s' unknown" % req.what,
251 elif method == luxi.REQ_QUERY_FIELDS:
252 req = objects.QueryFieldsRequest.FromDict(args)
255 fielddefs = query.ALL_FIELDS[req.what]
257 raise errors.OpPrereqError("Resource type '%s' unknown" % req.what,
260 return query.QueryFields(fielddefs, req.fields)
262 elif method == luxi.REQ_QUERY_JOBS:
263 (job_ids, fields) = args
264 if isinstance(job_ids, (tuple, list)) and job_ids:
265 msg = utils.CommaJoin(job_ids)
268 logging.info("Received job query request for %s", msg)
269 return queue.QueryJobs(job_ids, fields)
271 elif method == luxi.REQ_QUERY_INSTANCES:
272 (names, fields, use_locking) = args
273 logging.info("Received instance query request for %s", names)
275 raise errors.OpPrereqError("Sync queries are not allowed",
277 op = opcodes.OpInstanceQuery(names=names, output_fields=fields,
278 use_locking=use_locking)
279 return self._Query(op)
281 elif method == luxi.REQ_QUERY_NODES:
282 (names, fields, use_locking) = args
283 logging.info("Received node query request for %s", names)
285 raise errors.OpPrereqError("Sync queries are not allowed",
287 op = opcodes.OpNodeQuery(names=names, output_fields=fields,
288 use_locking=use_locking)
289 return self._Query(op)
291 elif method == luxi.REQ_QUERY_GROUPS:
292 (names, fields, use_locking) = args
293 logging.info("Received group query request for %s", names)
295 raise errors.OpPrereqError("Sync queries are not allowed",
297 op = opcodes.OpGroupQuery(names=names, output_fields=fields)
298 return self._Query(op)
300 elif method == luxi.REQ_QUERY_EXPORTS:
301 nodes, use_locking = args
303 raise errors.OpPrereqError("Sync queries are not allowed",
305 logging.info("Received exports query request")
306 op = opcodes.OpBackupQuery(nodes=nodes, use_locking=use_locking)
307 return self._Query(op)
309 elif method == luxi.REQ_QUERY_CONFIG_VALUES:
311 logging.info("Received config values query request for %s", fields)
312 op = opcodes.OpClusterConfigQuery(output_fields=fields)
313 return self._Query(op)
315 elif method == luxi.REQ_QUERY_CLUSTER_INFO:
316 logging.info("Received cluster info query request")
317 op = opcodes.OpClusterQuery()
318 return self._Query(op)
320 elif method == luxi.REQ_QUERY_TAGS:
322 logging.info("Received tags query request")
323 op = opcodes.OpTagsGet(kind=kind, name=name)
324 return self._Query(op)
326 elif method == luxi.REQ_QUERY_LOCKS:
327 (fields, sync) = args
328 logging.info("Received locks query request")
330 raise NotImplementedError("Synchronous queries are not implemented")
331 return self.server.context.glm.OldStyleQueryLocks(fields)
333 elif method == luxi.REQ_QUEUE_SET_DRAIN_FLAG:
335 logging.info("Received queue drain flag change request to %s",
337 return queue.SetDrainFlag(drain_flag)
339 elif method == luxi.REQ_SET_WATCHER_PAUSE:
343 logging.info("Received request to no longer pause the watcher")
345 if not isinstance(until, (int, float)):
346 raise TypeError("Duration must be an integer or float")
348 if until < time.time():
349 raise errors.GenericError("Unable to set pause end time in the past")
351 logging.info("Received request to pause the watcher until %s", until)
353 return _SetWatcherPause(until)
356 logging.info("Received invalid request '%s'", method)
357 raise ValueError("Invalid operation '%s'" % method)
359 def _Query(self, op):
360 """Runs the specified opcode and returns the result.
363 # Queries don't have a job id
364 proc = mcpu.Processor(self.server.context, None)
366 # TODO: Executing an opcode using locks will acquire them in blocking mode.
367 # Consider using a timeout for retries.
368 return proc.ExecOpCode(op, None)
371 class GanetiContext(object):
372 """Context common to all ganeti threads.
374 This class creates and holds common objects shared by all threads.
377 # pylint: disable=W0212
378 # we do want to ensure a singleton here
382 """Constructs a new GanetiContext object.
384 There should be only a GanetiContext object at any time, so this
385 function raises an error if this is not the case.
388 assert self.__class__._instance is None, "double GanetiContext instance"
390 # Create global configuration object
391 self.cfg = config.ConfigWriter()
394 self.glm = locking.GanetiLockManager(
395 self.cfg.GetNodeList(),
396 self.cfg.GetNodeGroupList(),
397 self.cfg.GetInstanceList())
400 self.jobqueue = jqueue.JobQueue(self)
403 self.rpc = rpc.RpcRunner(self)
405 # setting this also locks the class against attribute modifications
406 self.__class__._instance = self
408 def __setattr__(self, name, value):
409 """Setting GanetiContext attributes is forbidden after initialization.
412 assert self.__class__._instance is None, "Attempt to modify Ganeti Context"
413 object.__setattr__(self, name, value)
415 def AddNode(self, node, ec_id):
416 """Adds a node to the configuration and lock manager.
419 # Add it to the configuration
420 self.cfg.AddNode(node, ec_id)
422 # If preseeding fails it'll not be added
423 self.jobqueue.AddNode(node)
425 # Add the new node to the Ganeti Lock Manager
426 self.glm.add(locking.LEVEL_NODE, node.name)
428 def ReaddNode(self, node):
429 """Updates a node that's already in the configuration
432 # Synchronize the queue again
433 self.jobqueue.AddNode(node)
435 def RemoveNode(self, name):
436 """Removes a node from the configuration and lock manager.
439 # Remove node from configuration
440 self.cfg.RemoveNode(name)
443 self.jobqueue.RemoveNode(name)
445 # Remove the node from the Ganeti Lock Manager
446 self.glm.remove(locking.LEVEL_NODE, name)
449 def _SetWatcherPause(until):
450 """Creates or removes the watcher pause file.
452 @type until: None or int
453 @param until: Unix timestamp saying until when the watcher shouldn't run
457 utils.RemoveFile(constants.WATCHER_PAUSEFILE)
459 utils.WriteFile(constants.WATCHER_PAUSEFILE,
460 data="%d\n" % (until, ))
466 def CheckAgreement():
467 """Check the agreement on who is the master.
469 The function uses a very simple algorithm: we must get more positive
470 than negative answers. Since in most of the cases we are the master,
471 we'll use our own config file for getting the node list. In the
472 future we could collect the current node list from our (possibly
473 obsolete) known nodes.
475 In order to account for cold-start of all nodes, we retry for up to
476 a minute until we get a real answer as the top-voted one. If the
477 nodes are more out-of-sync, for now manual startup of the master
480 Note that for a even number of nodes cluster, we need at least half
481 of the nodes (beside ourselves) to vote for us. This creates a
482 problem on two-node clusters, since in this case we require the
483 other node to be up too to confirm our status.
486 myself = netutils.Hostname.GetSysName()
487 #temp instantiation of a config writer, used only to get the node list
488 cfg = config.ConfigWriter()
489 node_list = cfg.GetNodeList()
493 votes = bootstrap.GatherMasterVotes(node_list)
495 # empty node list, this is a one node cluster
497 if votes[0][0] is None:
503 logging.critical("Cluster inconsistent, most of the nodes didn't answer"
504 " after multiple retries. Aborting startup")
505 logging.critical("Use the --no-voting option if you understand what"
506 " effects it has on the cluster state")
508 # here a real node is at the top of the list
509 all_votes = sum(item[1] for item in votes)
510 top_node, top_votes = votes[0]
513 if top_node != myself:
514 logging.critical("It seems we are not the master (top-voted node"
515 " is %s with %d out of %d votes)", top_node, top_votes,
517 elif top_votes < all_votes - top_votes:
518 logging.critical("It seems we are not the master (%d votes for,"
519 " %d votes against)", top_votes, all_votes - top_votes)
527 def ActivateMasterIP():
529 master_node = ssconf.SimpleStore().GetMasterNode()
530 result = rpc.RpcRunner.call_node_activate_master_ip(master_node)
531 msg = result.fail_msg
533 logging.error("Can't activate master IP address: %s", msg)
536 def CheckMasterd(options, args):
537 """Initial checks whether to run or exit with a failure.
540 if args: # masterd doesn't take any arguments
541 print >> sys.stderr, ("Usage: %s [-f] [-d]" % sys.argv[0])
542 sys.exit(constants.EXIT_FAILURE)
544 ssconf.CheckMaster(options.debug)
547 options.uid = pwd.getpwnam(constants.MASTERD_USER).pw_uid
548 options.gid = grp.getgrnam(constants.DAEMONS_GROUP).gr_gid
550 print >> sys.stderr, ("User or group not existing on system: %s:%s" %
551 (constants.MASTERD_USER, constants.DAEMONS_GROUP))
552 sys.exit(constants.EXIT_FAILURE)
554 # Check the configuration is sane before anything else
556 config.ConfigWriter()
557 except errors.ConfigVersionMismatch, err:
558 v1 = "%s.%s.%s" % constants.SplitVersion(err.args[0])
559 v2 = "%s.%s.%s" % constants.SplitVersion(err.args[1])
560 print >> sys.stderr, \
561 ("Configuration version mismatch. The current Ganeti software"
562 " expects version %s, but the on-disk configuration file has"
563 " version %s. This is likely the result of upgrading the"
564 " software without running the upgrade procedure. Please contact"
565 " your cluster administrator or complete the upgrade using the"
566 " cfgupgrade utility, after reading the upgrade notes." %
568 sys.exit(constants.EXIT_FAILURE)
569 except errors.ConfigurationError, err:
570 print >> sys.stderr, \
571 ("Configuration error while opening the configuration file: %s\n"
572 "This might be caused by an incomplete software upgrade or"
573 " by a corrupted configuration file. Until the problem is fixed"
574 " the master daemon cannot start." % str(err))
575 sys.exit(constants.EXIT_FAILURE)
577 # If CheckMaster didn't fail we believe we are the master, but we have to
578 # confirm with the other nodes.
579 if options.no_voting:
580 if not options.yes_do_it:
581 sys.stdout.write("The 'no voting' option has been selected.\n")
582 sys.stdout.write("This is dangerous, please confirm by"
583 " typing uppercase 'yes': ")
586 confirmation = sys.stdin.readline().strip()
587 if confirmation != "YES":
588 print >> sys.stderr, "Aborting."
589 sys.exit(constants.EXIT_FAILURE)
592 # CheckAgreement uses RPC and threads, hence it needs to be run in
593 # a separate process before we call utils.Daemonize in the current
595 if not utils.RunInSeparateProcess(CheckAgreement):
596 sys.exit(constants.EXIT_FAILURE)
598 # ActivateMasterIP also uses RPC/threads, so we run it again via a
601 # TODO: decide whether failure to activate the master IP is a fatal error
602 utils.RunInSeparateProcess(ActivateMasterIP)
605 def PrepMasterd(options, _):
606 """Prep master daemon function, executed with the PID file held.
609 # This is safe to do as the pid file guarantees against
610 # concurrent execution.
611 utils.RemoveFile(constants.MASTER_SOCKET)
613 mainloop = daemon.Mainloop()
614 master = MasterServer(mainloop, constants.MASTER_SOCKET,
615 options.uid, options.gid)
616 return (mainloop, master)
619 def ExecMasterd(options, args, prep_data): # pylint: disable=W0613
620 """Main master daemon function, executed with the PID file held.
623 (mainloop, master) = prep_data
631 master.server_cleanup()
635 utils.RemoveFile(constants.MASTER_SOCKET)
640 parser = OptionParser(description="Ganeti master daemon",
641 usage="%prog [-f] [-d]",
642 version="%%prog (ganeti) %s" %
643 constants.RELEASE_VERSION)
644 parser.add_option("--no-voting", dest="no_voting",
645 help="Do not check that the nodes agree on this node"
646 " being the master and start the daemon unconditionally",
647 default=False, action="store_true")
648 parser.add_option("--yes-do-it", dest="yes_do_it",
649 help="Override interactive check for --no-voting",
650 default=False, action="store_true")
651 daemon.GenericMain(constants.MASTERD, parser, CheckMasterd, PrepMasterd,
652 ExecMasterd, multithreaded=True)