diff --git a/Makefile.am b/Makefile.am
index b8ee63ef31879ad595897ec986b6999aa4ce7822..9e4038fdb142f57f034f3f09cd56d33821ac2a8b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -150,6 +150,7 @@ dist_sbin_SCRIPTS = \
daemons/ganeti-noded \
daemons/ganeti-watcher \
daemons/ganeti-masterd \
+ daemons/ganeti-confd \
daemons/ganeti-rapi \
scripts/gnt-backup \
scripts/gnt-cluster \
diff --git a/daemons/ganeti-confd b/daemons/ganeti-confd
new file mode 100755
index 0000000000000000000000000000000000000000..2f2e95bbd3ad51cafdc5f31c1c4db908db4c21e2
--- /dev/null
+++ b/daemons/ganeti-confd
@@ -0,0 +1,238 @@
+#!/usr/bin/python
+#
+
+# Copyright (C) 2009, Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+
+"""Ganeti configuration daemon
+
+Ganeti-confd is a daemon to query master candidates for configuration values.
+It uses UDP+HMAC for authentication with a global cluster key.
+
+"""
+
+import os
+import sys
+import traceback
+import errno
+import logging
+import time
+import asyncore
+import socket
+import pyinotify
+
+from optparse import OptionParser
+
+from ganeti import constants
+from ganeti import objects
+from ganeti import errors
+from ganeti import daemon
+from ganeti import utils
+from ganeti import ssconf
+from ganeti import serializer
+from ganeti.asyncnotifier import AsyncNotifier
+from ganeti.confd.server import ConfdProcessor
+
+
+class ConfdAsyncUDPServer(asyncore.dispatcher):
+ """The confd udp server, suitable for use with asyncore.
+
+ """
+ def __init__(self, bind_address, port, processor):
+ """Constructor for ConfdAsyncUDPServer
+
+ @type bind_address: string
+ @param bind_address: socket bind address ('' for all)
+ @type port: int
+ @param port: udp port
+ @type processor: L{confd.server.ConfdProcessor}
+ @param reader: ConfigReader to use to access the config
+
+ """
+ asyncore.dispatcher.__init__(self)
+ self.bind_address = bind_address
+ self.port = port
+ self.processor = processor
+ self.create_socket(socket.AF_INET, socket.SOCK_DGRAM)
+ self.bind((bind_address, port))
+ logging.debug("listening on ('%s':%d)" % (bind_address, port))
+
+ # this method is overriding an asyncore.dispatcher method
+ def handle_connect(self):
+ # Python thinks that the first udp message from a source qualifies as a
+ # "connect" and further ones are part of the same connection. We beg to
+ # differ and treat all messages equally.
+ pass
+
+ # this method is overriding an asyncore.dispatcher method
+ def handle_read(self):
+ try:
+ payload_in, address = self.recvfrom(4096)
+ ip, port = address
+ payload_out = self.processor.ExecQuery(payload_in, ip, port)
+ if payload_out is not None:
+ self.sendto(payload_out, 0, (ip, port))
+ except:
+ # we need to catch any exception here, log it, but proceed, because even
+ # if we failed handling a single request, we still want the confd to
+ # continue working.
+ logging.error("Unexpected exception", exc_info=True)
+
+ # this method is overriding an asyncore.dispatcher method
+ def writable(self):
+ # No need to check if we can write to the UDP socket
+ return False
+
+
+class ConfdInotifyEventHandler(pyinotify.ProcessEvent):
+
+ def __init__(self, watch_manager, reader,
+ file=constants.CLUSTER_CONF_FILE):
+ """Constructor for ConfdInotifyEventHandler
+
+ @type watch_manager: L{pyinotify.WatchManager}
+ @param watch_manager: ganeti-confd inotify watch manager
+ @type reader: L{ssconf.SimpleConfigReader}
+ @param reader: ganeti-confd SimpleConfigReader
+ @type file: string
+ @param file: config file to watch
+
+ """
+ # no need to call the parent's constructor
+ self.watch_manager = watch_manager
+ self.reader = reader
+ self.mask = pyinotify.EventsCodes.IN_IGNORED | \
+ pyinotify.EventsCodes.IN_MODIFY
+ self.file = file
+ self.add_config_watch()
+
+ def add_config_watch(self):
+ """Add a watcher for the ganeti config file
+
+ """
+ result = self.watch_manager.add_watch(self.file, self.mask)
+ if not result[self.file] > 0:
+ raise errors.ConfdFatalError("Could not add inotify watcher")
+
+ def reload_config(self):
+ try:
+ reloaded = self.reader.Reload()
+ if reloaded:
+ logging.info("Reloaded ganeti config")
+ else:
+ logging.debug("Skipped double config reload")
+ except errors.ConfigurationError:
+ # transform a ConfigurationError in a fatal error, that will cause confd
+ # to quit.
+ raise errors.ConfdFatalError(err)
+
+ def process_IN_IGNORED(self, event):
+ # Due to the fact that we monitor just for the cluster config file (rather
+ # than for the whole data dir) when the file is replaced with another one
+ # (which is what happens normally in ganeti) we're going to receive an
+ # IN_IGNORED event from inotify, because of the file removal (which is
+ # contextual with the replacement). In such a case we need to create
+ # another watcher for the "new" file.
+ logging.debug("Received 'ignored' inotify event for %s" % event.path)
+
+ try:
+ # Since the kernel believes the file we were interested in is gone, it's
+ # not going to notify us of any other events, until we set up, here, the
+ # new watch. This is not a race condition, though, since we're anyway
+ # going to realod the file after setting up the new watch.
+ self.add_config_watch()
+ self.reload_config()
+ except errors.ConfdFatalError, err:
+ logging.critical("Critical error, shutting down: %s" % err)
+ sys.exit(constants.EXIT_FAILURE)
+ except:
+ # we need to catch any exception here, log it, but proceed, because even
+ # if we failed handling a single request, we still want the confd to
+ # continue working.
+ logging.error("Unexpected exception", exc_info=True)
+
+ def process_IN_MODIFY(self, event):
+ # This gets called when the config file is modified. Note that this doesn't
+ # usually happen in Ganeti, as the config file is normally replaced by a
+ # new one, at filesystem level, rather than actually modified (see
+ # utils.WriteFile)
+ logging.debug("Received 'modify' inotify event for %s" % event.path)
+
+ try:
+ self.reload_config()
+ except errors.ConfdFatalError, err:
+ logging.critical("Critical error, shutting down: %s" % err)
+ sys.exit(constants.EXIT_FAILURE)
+ except:
+ # we need to catch any exception here, log it, but proceed, because even
+ # if we failed handling a single request, we still want the confd to
+ # continue working.
+ logging.error("Unexpected exception", exc_info=True)
+
+ def process_default(self, event):
+ logging.error("Received unhandled inotify event: %s" % event)
+
+
+def CheckCONFD(options, args):
+ """Initial checks whether to run exit with a failure
+
+ """
+ # TODO: collapse HMAC daemons handling in daemons GenericMain, when we'll
+ # have more than one.
+ if not os.path.isfile(constants.HMAC_CLUSTER_KEY):
+ print >> sys.stderr, "Need HMAC key %s to run" % constants.HMAC_CLUSTER_KEY
+ sys.exit(constants.EXIT_FAILURE)
+
+ ssconf.CheckMasterCandidate(options.debug)
+
+
+def ExecCONFD(options, args):
+ """Main CONFD function, executed with pidfile held
+
+ """
+ # confd-level SimpleConfigReader
+ reader = ssconf.SimpleConfigReader()
+
+ # Asyncronous confd UDP server
+ processor = ConfdProcessor(reader)
+ server = ConfdAsyncUDPServer(options.bind_address, options.port, processor)
+
+ # Asyncronous inotify handler for config changes
+ wm = pyinotify.WatchManager()
+ confd_event_handler = ConfdInotifyEventHandler(wm, reader)
+ notifier = AsyncNotifier(wm, confd_event_handler)
+ asyncore.loop()
+
+
+def main():
+ """Main function for the confd daemon.
+
+ """
+ parser = OptionParser(description="Ganeti configuration daemon",
+ usage="%prog [-f] [-d] [-b ADDRESS]",
+ version="%%prog (ganeti) %s" %
+ constants.RELEASE_VERSION)
+
+ dirs = [(val, constants.RUN_DIRS_MODE) for val in constants.SUB_RUN_DIRS]
+ dirs.append((constants.LOG_OS_DIR, 0750))
+ dirs.append((constants.LOCK_DIR, 1777))
+ daemon.GenericMain(constants.CONFD, parser, dirs, CheckCONFD, ExecCONFD)
+
+
+if __name__ == '__main__':
+ main()