-#!/usr/bin/python -u
+#!/usr/bin/python
#
# Copyright (C) 2006, 2007 Google Inc.
"""
+# pylint: disable-msg=C0103
+# C0103: Invalid name ganeti-masterd
+import os
import sys
import SocketServer
import time
import collections
-import Queue
-import random
import signal
-import simplejson
import logging
-from cStringIO import StringIO
from optparse import OptionParser
from ganeti import config
from ganeti import constants
+from ganeti import daemon
from ganeti import mcpu
from ganeti import opcodes
from ganeti import jqueue
from ganeti import utils
from ganeti import errors
from ganeti import ssconf
-from ganeti import logger
from ganeti import workerpool
+from ganeti import rpc
+from ganeti import bootstrap
+from ganeti import serializer
CLIENT_REQUEST_WORKERS = 16
class ClientRequestWorker(workerpool.BaseWorker):
+ # pylint: disable-msg=W0221
def RunTask(self, server, request, client_address):
"""Process the request.
try:
server.finish_request(request, client_address)
server.close_request(request)
- except:
+ except: # pylint: disable-msg=W0702
server.handle_error(request, client_address)
server.close_request(request)
cleanup at shutdown.
"""
- def __init__(self, address, rqhandler, context):
+ def __init__(self, address, rqhandler):
"""IOServer constructor
- Args:
- address: the address to bind this IOServer to
- rqhandler: RequestHandler type object
- context: Context Object common to all worker threads
+ @param address: the address to bind this IOServer to
+ @param rqhandler: RequestHandler type object
"""
SocketServer.UnixStreamServer.__init__(self, address, rqhandler)
- self.context = context
# We'll only start threads once we've forked.
- self.jobqueue = None
+ self.context = None
self.request_workers = None
def setup_queue(self):
- self.jobqueue = jqueue.JobQueue(self.context)
- self.request_workers = workerpool.WorkerPool(CLIENT_REQUEST_WORKERS,
+ self.context = GanetiContext()
+ self.request_workers = workerpool.WorkerPool("ClientReq",
+ CLIENT_REQUEST_WORKERS,
ClientRequestWorker)
def process_request(self, request, client_address):
"""
self.request_workers.AddTask(self, request, client_address)
- def serve_forever(self):
+ @utils.SignalHandled([signal.SIGINT, signal.SIGTERM])
+ def serve_forever(self, signal_handlers=None): # pylint: disable-msg=W0221
"""Handle one request at a time until told to quit."""
- sighandler = utils.SignalHandler([signal.SIGINT, signal.SIGTERM])
- try:
- while not sighandler.called:
- self.handle_request()
- finally:
- sighandler.Reset()
+ assert isinstance(signal_handlers, dict) and \
+ len(signal_handlers) > 0, \
+ "Broken SignalHandled decorator"
+ # Since we use SignalHandled only once, the resulting dict will map all
+ # signals to the same handler. We'll just use the first one.
+ sighandler = signal_handlers.values()[0]
+ while not sighandler.called:
+ self.handle_request()
def server_cleanup(self):
"""Cleanup the server.
"""
try:
self.server_close()
- utils.RemoveFile(constants.MASTER_SOCKET)
finally:
if self.request_workers:
self.request_workers.TerminateWorkers()
- if self.jobqueue:
- self.jobqueue.Shutdown()
+ if self.context:
+ self.context.jobqueue.Shutdown()
class ClientRqHandler(SocketServer.BaseRequestHandler):
READ_SIZE = 4096
def setup(self):
+ # pylint: disable-msg=W0201
+ # setup() is the api for initialising for this class
self._buffer = ""
self._msgs = collections.deque()
self._ops = ClientOps(self.server)
while True:
msg = self.read_message()
if msg is None:
- logging.info("client closed connection")
+ logging.debug("client closed connection")
break
- request = simplejson.loads(msg)
+ request = serializer.LoadJson(msg)
logging.debug("request: %s", request)
if not isinstance(request, dict):
logging.error("wrong request received: %s", msg)
try:
result = self._ops.handle_request(method, args)
success = True
+ except errors.GenericError, err:
+ success = False
+ result = errors.EncodeException(err)
except:
logging.error("Unexpected exception", exc_info=True)
err = sys.exc_info()
luxi.KEY_RESULT: result,
}
logging.debug("response: %s", response)
- self.send_message(simplejson.dumps(response))
+ self.send_message(serializer.DumpJson(response))
def read_message(self):
while not self._msgs:
def send_message(self, msg):
#print "sending", msg
+ # TODO: sendall is not guaranteed to send everything
self.request.sendall(msg + self.EOM)
def __init__(self, server):
self.server = server
- def handle_request(self, method, args):
- queue = self.server.jobqueue
+ def handle_request(self, method, args): # pylint: disable-msg=R0911
+ queue = self.server.context.jobqueue
# TODO: Parameter validation
+ # TODO: Rewrite to not exit in each 'if/elif' branch
+
if method == luxi.REQ_SUBMIT_JOB:
+ logging.info("Received new job")
ops = [opcodes.OpCode.LoadOpCode(state) for state in args]
return queue.SubmitJob(ops)
+ if method == luxi.REQ_SUBMIT_MANY_JOBS:
+ logging.info("Received multiple jobs")
+ jobs = []
+ for ops in args:
+ jobs.append([opcodes.OpCode.LoadOpCode(state) for state in ops])
+ return queue.SubmitManyJobs(jobs)
+
elif method == luxi.REQ_CANCEL_JOB:
- (job_id, ) = args
+ job_id = args
+ logging.info("Received job cancel request for %s", job_id)
return queue.CancelJob(job_id)
elif method == luxi.REQ_ARCHIVE_JOB:
- (job_id, ) = args
+ job_id = args
+ logging.info("Received job archive request for %s", job_id)
return queue.ArchiveJob(job_id)
+ elif method == luxi.REQ_AUTOARCHIVE_JOBS:
+ (age, timeout) = args
+ logging.info("Received job autoarchive request for age %s, timeout %s",
+ age, timeout)
+ return queue.AutoArchiveJobs(age, timeout)
+
+ elif method == luxi.REQ_WAIT_FOR_JOB_CHANGE:
+ (job_id, fields, prev_job_info, prev_log_serial, timeout) = args
+ logging.info("Received job poll request for %s", job_id)
+ return queue.WaitForJobChanges(job_id, fields, prev_job_info,
+ prev_log_serial, timeout)
+
elif method == luxi.REQ_QUERY_JOBS:
(job_ids, fields) = args
+ if isinstance(job_ids, (tuple, list)) and job_ids:
+ msg = utils.CommaJoin(job_ids)
+ else:
+ msg = str(job_ids)
+ logging.info("Received job query request for %s", msg)
return queue.QueryJobs(job_ids, fields)
+ elif method == luxi.REQ_QUERY_INSTANCES:
+ (names, fields, use_locking) = args
+ logging.info("Received instance query request for %s", names)
+ if use_locking:
+ raise errors.OpPrereqError("Sync queries are not allowed",
+ errors.ECODE_INVAL)
+ op = opcodes.OpQueryInstances(names=names, output_fields=fields,
+ use_locking=use_locking)
+ return self._Query(op)
+
+ elif method == luxi.REQ_QUERY_NODES:
+ (names, fields, use_locking) = args
+ logging.info("Received node query request for %s", names)
+ if use_locking:
+ raise errors.OpPrereqError("Sync queries are not allowed",
+ errors.ECODE_INVAL)
+ op = opcodes.OpQueryNodes(names=names, output_fields=fields,
+ use_locking=use_locking)
+ return self._Query(op)
+
+ elif method == luxi.REQ_QUERY_EXPORTS:
+ nodes, use_locking = args
+ if use_locking:
+ raise errors.OpPrereqError("Sync queries are not allowed",
+ errors.ECODE_INVAL)
+ logging.info("Received exports query request")
+ op = opcodes.OpQueryExports(nodes=nodes, use_locking=use_locking)
+ return self._Query(op)
+
+ elif method == luxi.REQ_QUERY_CONFIG_VALUES:
+ fields = args
+ logging.info("Received config values query request for %s", fields)
+ op = opcodes.OpQueryConfigValues(output_fields=fields)
+ return self._Query(op)
+
+ elif method == luxi.REQ_QUERY_CLUSTER_INFO:
+ logging.info("Received cluster info query request")
+ op = opcodes.OpQueryClusterInfo()
+ return self._Query(op)
+
+ elif method == luxi.REQ_QUERY_TAGS:
+ kind, name = args
+ logging.info("Received tags query request")
+ op = opcodes.OpGetTags(kind=kind, name=name)
+ return self._Query(op)
+
+ elif method == luxi.REQ_QUEUE_SET_DRAIN_FLAG:
+ drain_flag = args
+ logging.info("Received queue drain flag change request to %s",
+ drain_flag)
+ return queue.SetDrainFlag(drain_flag)
+
+ elif method == luxi.REQ_SET_WATCHER_PAUSE:
+ (until, ) = args
+
+ if until is None:
+ logging.info("Received request to no longer pause the watcher")
+ else:
+ if not isinstance(until, (int, float)):
+ raise TypeError("Duration must be an integer or float")
+
+ if until < time.time():
+ raise errors.GenericError("Unable to set pause end time in the past")
+
+ logging.info("Received request to pause the watcher until %s", until)
+
+ return _SetWatcherPause(until)
+
else:
- raise ValueError("Invalid operation")
+ logging.info("Received invalid request '%s'", method)
+ raise ValueError("Invalid operation '%s'" % method)
+
+ def _Query(self, op):
+ """Runs the specified opcode and returns the result.
+
+ """
+ # Queries don't have a job id
+ proc = mcpu.Processor(self.server.context, None)
+ return proc.ExecOpCode(op, None)
class GanetiContext(object):
This class creates and holds common objects shared by all threads.
"""
+ # pylint: disable-msg=W0212
+ # we do want to ensure a singleton here
_instance = None
def __init__(self):
"""
assert self.__class__._instance is None, "double GanetiContext instance"
- # Create a ConfigWriter...
+ # Create global configuration object
self.cfg = config.ConfigWriter()
- # And a GanetiLockingManager...
+
+ # Locking manager
self.glm = locking.GanetiLockManager(
self.cfg.GetNodeList(),
self.cfg.GetInstanceList())
+ # Job queue
+ self.jobqueue = jqueue.JobQueue(self)
+
# setting this also locks the class against attribute modifications
self.__class__._instance = self
assert self.__class__._instance is None, "Attempt to modify Ganeti Context"
object.__setattr__(self, name, value)
+ def AddNode(self, node, ec_id):
+ """Adds a node to the configuration and lock manager.
+
+ """
+ # Add it to the configuration
+ self.cfg.AddNode(node, ec_id)
+
+ # If preseeding fails it'll not be added
+ self.jobqueue.AddNode(node)
-def CheckMaster(debug):
- """Checks the node setup.
+ # Add the new node to the Ganeti Lock Manager
+ self.glm.add(locking.LEVEL_NODE, node.name)
- If this is the master, the function will return. Otherwise it will
- exit with an exit code based on the node status.
+ def ReaddNode(self, node):
+ """Updates a node that's already in the configuration
+
+ """
+ # Synchronize the queue again
+ self.jobqueue.AddNode(node)
+
+ def RemoveNode(self, name):
+ """Removes a node from the configuration and lock manager.
+
+ """
+ # Remove node from configuration
+ self.cfg.RemoveNode(name)
+
+ # Notify job queue
+ self.jobqueue.RemoveNode(name)
+
+ # Remove the node from the Ganeti Lock Manager
+ self.glm.remove(locking.LEVEL_NODE, name)
+
+
+def _SetWatcherPause(until):
+ """Creates or removes the watcher pause file.
+
+ @type until: None or int
+ @param until: Unix timestamp saying until when the watcher shouldn't run
"""
- try:
- ss = ssconf.SimpleStore()
- master_name = ss.GetMasterNode()
- except errors.ConfigurationError, err:
- print "Cluster configuration incomplete: '%s'" % str(err)
- sys.exit(EXIT_NODESETUP_ERROR)
+ if until is None:
+ utils.RemoveFile(constants.WATCHER_PAUSEFILE)
+ else:
+ utils.WriteFile(constants.WATCHER_PAUSEFILE,
+ data="%d\n" % (until, ))
+
+ return until
+
+
+def CheckAgreement():
+ """Check the agreement on who is the master.
+ The function uses a very simple algorithm: we must get more positive
+ than negative answers. Since in most of the cases we are the master,
+ we'll use our own config file for getting the node list. In the
+ future we could collect the current node list from our (possibly
+ obsolete) known nodes.
+
+ In order to account for cold-start of all nodes, we retry for up to
+ a minute until we get a real answer as the top-voted one. If the
+ nodes are more out-of-sync, for now manual startup of the master
+ should be attempted.
+
+ Note that for a even number of nodes cluster, we need at least half
+ of the nodes (beside ourselves) to vote for us. This creates a
+ problem on two-node clusters, since in this case we require the
+ other node to be up too to confirm our status.
+
+ """
+ myself = utils.HostInfo().name
+ #temp instantiation of a config writer, used only to get the node list
+ cfg = config.ConfigWriter()
+ node_list = cfg.GetNodeList()
+ del cfg
+ retries = 6
+ while retries > 0:
+ votes = bootstrap.GatherMasterVotes(node_list)
+ if not votes:
+ # empty node list, this is a one node cluster
+ return True
+ if votes[0][0] is None:
+ retries -= 1
+ time.sleep(10)
+ continue
+ break
+ if retries == 0:
+ logging.critical("Cluster inconsistent, most of the nodes didn't answer"
+ " after multiple retries. Aborting startup")
+ return False
+ # here a real node is at the top of the list
+ all_votes = sum(item[1] for item in votes)
+ top_node, top_votes = votes[0]
+
+ result = False
+ if top_node != myself:
+ logging.critical("It seems we are not the master (top-voted node"
+ " is %s with %d out of %d votes)", top_node, top_votes,
+ all_votes)
+ elif top_votes < all_votes - top_votes:
+ logging.critical("It seems we are not the master (%d votes for,"
+ " %d votes against)", top_votes, all_votes - top_votes)
+ else:
+ result = True
+
+ return result
+
+
+def CheckAgreementWithRpc():
+ rpc.Init()
try:
- myself = utils.HostInfo()
- except errors.ResolverError, err:
- sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
- sys.exit(EXIT_NODESETUP_ERROR)
+ return CheckAgreement()
+ finally:
+ rpc.Shutdown()
- if myself.name != master_name:
- if debug:
- sys.stderr.write("Not master, exiting.\n")
- sys.exit(EXIT_NOTMASTER)
+def _RunInSeparateProcess(fn):
+ """Runs a function in a separate process.
-def ParseOptions():
- """Parse the command line options.
+ Note: Only boolean return values are supported.
- Returns:
- (options, args) as from OptionParser.parse_args()
+ @type fn: callable
+ @param fn: Function to be called
+ @rtype: bool
"""
- parser = OptionParser(description="Ganeti master daemon",
- usage="%prog [-f] [-d]",
- version="%%prog (ganeti) %s" %
- constants.RELEASE_VERSION)
+ pid = os.fork()
+ if pid == 0:
+ # Child process
+ try:
+ # Call function
+ result = int(bool(fn()))
+ assert result in (0, 1)
+ except: # pylint: disable-msg=W0702
+ logging.exception("Error while calling function in separate process")
+ # 0 and 1 are reserved for the return value
+ result = 33
- parser.add_option("-f", "--foreground", dest="fork",
- help="Don't detach from the current terminal",
- default=True, action="store_false")
- parser.add_option("-d", "--debug", dest="debug",
- help="Enable some debug messages",
- default=False, action="store_true")
- options, args = parser.parse_args()
- return options, args
+ os._exit(result) # pylint: disable-msg=W0212
+ # Parent process
-def main():
- """Main function"""
+ # Avoid zombies and check exit code
+ (_, status) = os.waitpid(pid, 0)
+
+ if os.WIFSIGNALED(status):
+ signum = os.WTERMSIG(status)
+ exitcode = None
+ else:
+ signum = None
+ exitcode = os.WEXITSTATUS(status)
+
+ if not (exitcode in (0, 1) and signum is None):
+ logging.error("Child program failed (code=%s, signal=%s)",
+ exitcode, signum)
+ sys.exit(constants.EXIT_FAILURE)
+
+ return bool(exitcode)
+
+
+def CheckMasterd(options, args):
+ """Initial checks whether to run or exit with a failure.
+
+ """
+ if args: # masterd doesn't take any arguments
+ print >> sys.stderr, ("Usage: %s [-f] [-d]" % sys.argv[0])
+ sys.exit(constants.EXIT_FAILURE)
+
+ ssconf.CheckMaster(options.debug)
- options, args = ParseOptions()
- utils.debug = options.debug
- utils.no_fork = True
+ # If CheckMaster didn't fail we believe we are the master, but we have to
+ # confirm with the other nodes.
+ if options.no_voting:
+ if options.yes_do_it:
+ return
- CheckMaster(options.debug)
+ sys.stdout.write("The 'no voting' option has been selected.\n")
+ sys.stdout.write("This is dangerous, please confirm by"
+ " typing uppercase 'yes': ")
+ sys.stdout.flush()
- master = IOServer(constants.MASTER_SOCKET, ClientRqHandler, GanetiContext())
+ confirmation = sys.stdin.readline().strip()
+ if confirmation != "YES":
+ print >> sys.stderr, "Aborting."
+ sys.exit(constants.EXIT_FAILURE)
- # become a daemon
- if options.fork:
- utils.Daemonize(logfile=constants.LOG_MASTERDAEMON,
- noclose_fds=[master.fileno()])
+ return
- logger.SetupDaemon(constants.LOG_MASTERDAEMON, debug=options.debug,
- stderr_logging=not options.fork)
+ # CheckAgreement uses RPC and threads, hence it needs to be run in a separate
+ # process before we call utils.Daemonize in the current process.
+ if not _RunInSeparateProcess(CheckAgreementWithRpc):
+ sys.exit(constants.EXIT_FAILURE)
- logging.info("ganeti master daemon startup")
- master.setup_queue()
+def ExecMasterd (options, args): # pylint: disable-msg=W0613
+ """Main master daemon function, executed with the PID file held.
+
+ """
+ # This is safe to do as the pid file guarantees against
+ # concurrent execution.
+ utils.RemoveFile(constants.MASTER_SOCKET)
+
+ master = IOServer(constants.MASTER_SOCKET, ClientRqHandler)
try:
- master.serve_forever()
+ rpc.Init()
+ try:
+ # activate ip
+ master_node = ssconf.SimpleStore().GetMasterNode()
+ result = rpc.RpcRunner.call_node_start_master(master_node, False, False)
+ msg = result.fail_msg
+ if msg:
+ logging.error("Can't activate master IP address: %s", msg)
+
+ master.setup_queue()
+ try:
+ master.serve_forever()
+ finally:
+ master.server_cleanup()
+ finally:
+ rpc.Shutdown()
finally:
- master.server_cleanup()
+ utils.RemoveFile(constants.MASTER_SOCKET)
+
+
+def main():
+ """Main function"""
+ parser = OptionParser(description="Ganeti master daemon",
+ usage="%prog [-f] [-d]",
+ version="%%prog (ganeti) %s" %
+ constants.RELEASE_VERSION)
+ parser.add_option("--no-voting", dest="no_voting",
+ help="Do not check that the nodes agree on this node"
+ " being the master and start the daemon unconditionally",
+ default=False, action="store_true")
+ parser.add_option("--yes-do-it", dest="yes_do_it",
+ help="Override interactive check for --no-voting",
+ default=False, action="store_true")
+ dirs = [(constants.RUN_GANETI_DIR, constants.RUN_DIRS_MODE),
+ (constants.SOCKET_DIR, constants.SOCKET_DIR_MODE),
+ ]
+ daemon.GenericMain(constants.MASTERD, parser, dirs,
+ CheckMasterd, ExecMasterd)
if __name__ == "__main__":
projects / ganeti-local / blobdiff