4 # Copyright (C) 2006, 2007 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 """Configuration management for Ganeti
24 This module provides the interface to the Ganeti cluster configuration.
26 The configuration data is stored on every node but is updated on the master
27 only. After each update, the master distributes the data to the other nodes.
29 Currently, the data storage format is JSON. YAML was slow and consuming too
39 from ganeti import errors
40 from ganeti import locking
41 from ganeti import utils
42 from ganeti import constants
43 from ganeti import rpc
44 from ganeti import objects
45 from ganeti import serializer
48 _config_lock = locking.SharedLock()
51 def _ValidateConfig(data):
52 """Verifies that a configuration objects looks valid.
54 This only verifies the version of the configuration.
56 @raise errors.ConfigurationError: if the version differs from what
60 if data.version != constants.CONFIG_VERSION:
61 raise errors.ConfigurationError("Cluster configuration version"
62 " mismatch, got %s instead of %s" %
64 constants.CONFIG_VERSION))
68 """The interface to the cluster configuration.
71 def __init__(self, cfg_file=None, offline=False):
73 self._lock = _config_lock
74 self._config_data = None
75 self._offline = offline
77 self._cfg_file = constants.CLUSTER_CONF_FILE
79 self._cfg_file = cfg_file
80 self._temporary_ids = set()
81 self._temporary_drbds = {}
82 # Note: in order to prevent errors when resolving our name in
83 # _DistributeConfig, we compute it here once and reuse it; it's
84 # better to raise an error before starting to modify the config
85 # file than after it was modified
86 self._my_hostname = utils.HostInfo().name
87 self._last_cluster_serial = -1
90 # this method needs to be static, so that we can call it on the class
93 """Check if the cluster is configured.
96 return os.path.exists(constants.CLUSTER_CONF_FILE)
98 @locking.ssynchronized(_config_lock, shared=1)
99 def GenerateMAC(self):
100 """Generate a MAC for an instance.
102 This should check the current instances for duplicates.
105 prefix = self._config_data.cluster.mac_prefix
106 all_macs = self._AllMACs()
109 byte1 = random.randrange(0, 256)
110 byte2 = random.randrange(0, 256)
111 byte3 = random.randrange(0, 256)
112 mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
113 if mac not in all_macs:
117 raise errors.ConfigurationError("Can't generate unique MAC")
120 @locking.ssynchronized(_config_lock, shared=1)
121 def IsMacInUse(self, mac):
122 """Predicate: check if the specified MAC is in use in the Ganeti cluster.
124 This only checks instances managed by this cluster, it does not
125 check for potential collisions elsewhere.
128 all_macs = self._AllMACs()
129 return mac in all_macs
131 @locking.ssynchronized(_config_lock, shared=1)
132 def GenerateDRBDSecret(self):
133 """Generate a DRBD secret.
135 This checks the current disks for duplicates.
138 all_secrets = self._AllDRBDSecrets()
141 secret = utils.GenerateSecret()
142 if secret not in all_secrets:
146 raise errors.ConfigurationError("Can't generate unique DRBD secret")
149 def _ComputeAllLVs(self):
150 """Compute the list of all LVs.
154 for instance in self._config_data.instances.values():
155 node_data = instance.MapLVsByNode()
156 for lv_list in node_data.values():
157 lvnames.update(lv_list)
160 @locking.ssynchronized(_config_lock, shared=1)
161 def GenerateUniqueID(self, exceptions=None):
162 """Generate an unique disk name.
164 This checks the current node, instances and disk names for
167 @param exceptions: a list with some other names which should be checked
168 for uniqueness (used for example when you want to get
169 more than one id at one time without adding each one in
170 turn to the config file)
173 @return: the unique id
177 existing.update(self._temporary_ids)
178 existing.update(self._ComputeAllLVs())
179 existing.update(self._config_data.instances.keys())
180 existing.update(self._config_data.nodes.keys())
181 if exceptions is not None:
182 existing.update(exceptions)
185 unique_id = utils.NewUUID()
186 if unique_id not in existing and unique_id is not None:
189 raise errors.ConfigurationError("Not able generate an unique ID"
190 " (last tried ID: %s" % unique_id)
191 self._temporary_ids.add(unique_id)
195 """Return all MACs present in the config.
198 @return: the list of all MACs
202 for instance in self._config_data.instances.values():
203 for nic in instance.nics:
204 result.append(nic.mac)
208 def _AllDRBDSecrets(self):
209 """Return all DRBD secrets present in the config.
212 @return: the list of all DRBD secrets
215 def helper(disk, result):
216 """Recursively gather secrets from this disk."""
217 if disk.dev_type == constants.DT_DRBD8:
218 result.append(disk.logical_id[5])
220 for child in disk.children:
221 helper(child, result)
224 for instance in self._config_data.instances.values():
225 for disk in instance.disks:
230 def _UnlockedVerifyConfig(self):
234 @return: a list of error messages; a non-empty list signifies
241 data = self._config_data
242 for instance_name in data.instances:
243 instance = data.instances[instance_name]
244 if instance.primary_node not in data.nodes:
245 result.append("instance '%s' has invalid primary node '%s'" %
246 (instance_name, instance.primary_node))
247 for snode in instance.secondary_nodes:
248 if snode not in data.nodes:
249 result.append("instance '%s' has invalid secondary node '%s'" %
250 (instance_name, snode))
251 for idx, nic in enumerate(instance.nics):
252 if nic.mac in seen_macs:
253 result.append("instance '%s' has NIC %d mac %s duplicate" %
254 (instance_name, idx, nic.mac))
256 seen_macs.append(nic.mac)
258 # gather the drbd ports for duplicate checks
259 for dsk in instance.disks:
260 if dsk.dev_type in constants.LDS_DRBD:
261 tcp_port = dsk.logical_id[2]
262 if tcp_port not in ports:
264 ports[tcp_port].append((instance.name, "drbd disk %s" % dsk.iv_name))
265 # gather network port reservation
266 net_port = getattr(instance, "network_port", None)
267 if net_port is not None:
268 if net_port not in ports:
270 ports[net_port].append((instance.name, "network port"))
272 # instance disk verify
273 for idx, disk in enumerate(instance.disks):
274 result.extend(["instance '%s' disk %d error: %s" %
275 (instance.name, idx, msg) for msg in disk.Verify()])
277 # cluster-wide pool of free ports
278 for free_port in data.cluster.tcpudp_port_pool:
279 if free_port not in ports:
280 ports[free_port] = []
281 ports[free_port].append(("cluster", "port marked as free"))
283 # compute tcp/udp duplicate ports
289 txt = ", ".join(["%s/%s" % val for val in pdata])
290 result.append("tcp/udp port %s has duplicates: %s" % (pnum, txt))
292 # highest used tcp port check
294 if keys[-1] > data.cluster.highest_used_port:
295 result.append("Highest used port mismatch, saved %s, computed %s" %
296 (data.cluster.highest_used_port, keys[-1]))
298 if not data.nodes[data.cluster.master_node].master_candidate:
299 result.append("Master node is not a master candidate")
301 # master candidate checks
302 mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
304 result.append("Not enough master candidates: actual %d, target %d" %
308 d_map, duplicates = self._UnlockedComputeDRBDMap()
309 for node, minor, instance_a, instance_b in duplicates:
310 result.append("DRBD minor %d on node %s is assigned twice to instances"
311 " %s and %s" % (minor, node, instance_a, instance_b))
315 @locking.ssynchronized(_config_lock, shared=1)
316 def VerifyConfig(self):
319 This is just a wrapper over L{_UnlockedVerifyConfig}.
322 @return: a list of error messages; a non-empty list signifies
326 return self._UnlockedVerifyConfig()
328 def _UnlockedSetDiskID(self, disk, node_name):
329 """Convert the unique ID to the ID needed on the target nodes.
331 This is used only for drbd, which needs ip/port configuration.
333 The routine descends down and updates its children also, because
334 this helps when the only the top device is passed to the remote
337 This function is for internal use, when the config lock is already held.
341 for child in disk.children:
342 self._UnlockedSetDiskID(child, node_name)
344 if disk.logical_id is None and disk.physical_id is not None:
346 if disk.dev_type == constants.LD_DRBD8:
347 pnode, snode, port, pminor, sminor, secret = disk.logical_id
348 if node_name not in (pnode, snode):
349 raise errors.ConfigurationError("DRBD device not knowing node %s" %
351 pnode_info = self._UnlockedGetNodeInfo(pnode)
352 snode_info = self._UnlockedGetNodeInfo(snode)
353 if pnode_info is None or snode_info is None:
354 raise errors.ConfigurationError("Can't find primary or secondary node"
355 " for %s" % str(disk))
356 p_data = (pnode_info.secondary_ip, port)
357 s_data = (snode_info.secondary_ip, port)
358 if pnode == node_name:
359 disk.physical_id = p_data + s_data + (pminor, secret)
360 else: # it must be secondary, we tested above
361 disk.physical_id = s_data + p_data + (sminor, secret)
363 disk.physical_id = disk.logical_id
366 @locking.ssynchronized(_config_lock)
367 def SetDiskID(self, disk, node_name):
368 """Convert the unique ID to the ID needed on the target nodes.
370 This is used only for drbd, which needs ip/port configuration.
372 The routine descends down and updates its children also, because
373 this helps when the only the top device is passed to the remote
377 return self._UnlockedSetDiskID(disk, node_name)
379 @locking.ssynchronized(_config_lock)
380 def AddTcpUdpPort(self, port):
381 """Adds a new port to the available port pool.
384 if not isinstance(port, int):
385 raise errors.ProgrammerError("Invalid type passed for port")
387 self._config_data.cluster.tcpudp_port_pool.add(port)
390 @locking.ssynchronized(_config_lock, shared=1)
391 def GetPortList(self):
392 """Returns a copy of the current port list.
395 return self._config_data.cluster.tcpudp_port_pool.copy()
397 @locking.ssynchronized(_config_lock)
398 def AllocatePort(self):
401 The port will be taken from the available port pool or from the
402 default port range (and in this case we increase
406 # If there are TCP/IP ports configured, we use them first.
407 if self._config_data.cluster.tcpudp_port_pool:
408 port = self._config_data.cluster.tcpudp_port_pool.pop()
410 port = self._config_data.cluster.highest_used_port + 1
411 if port >= constants.LAST_DRBD_PORT:
412 raise errors.ConfigurationError("The highest used port is greater"
413 " than %s. Aborting." %
414 constants.LAST_DRBD_PORT)
415 self._config_data.cluster.highest_used_port = port
420 def _UnlockedComputeDRBDMap(self):
421 """Compute the used DRBD minor/nodes.
424 @return: dictionary of node_name: dict of minor: instance_name;
425 the returned dict will have all the nodes in it (even if with
426 an empty list), and a list of duplicates; if the duplicates
427 list is not empty, the configuration is corrupted and its caller
428 should raise an exception
431 def _AppendUsedPorts(instance_name, disk, used):
433 if disk.dev_type == constants.LD_DRBD8 and len(disk.logical_id) >= 5:
434 nodeA, nodeB, dummy, minorA, minorB = disk.logical_id[:5]
435 for node, port in ((nodeA, minorA), (nodeB, minorB)):
436 assert node in used, ("Node '%s' of instance '%s' not found"
437 " in node list" % (node, instance_name))
438 if port in used[node]:
439 duplicates.append((node, port, instance_name, used[node][port]))
441 used[node][port] = instance_name
443 for child in disk.children:
444 duplicates.extend(_AppendUsedPorts(instance_name, child, used))
448 my_dict = dict((node, {}) for node in self._config_data.nodes)
449 for instance in self._config_data.instances.itervalues():
450 for disk in instance.disks:
451 duplicates.extend(_AppendUsedPorts(instance.name, disk, my_dict))
452 for (node, minor), instance in self._temporary_drbds.iteritems():
453 if minor in my_dict[node] and my_dict[node][minor] != instance:
454 duplicates.append((node, minor, instance, my_dict[node][minor]))
456 my_dict[node][minor] = instance
457 return my_dict, duplicates
459 @locking.ssynchronized(_config_lock)
460 def ComputeDRBDMap(self):
461 """Compute the used DRBD minor/nodes.
463 This is just a wrapper over L{_UnlockedComputeDRBDMap}.
465 @return: dictionary of node_name: dict of minor: instance_name;
466 the returned dict will have all the nodes in it (even if with
470 d_map, duplicates = self._UnlockedComputeDRBDMap()
472 raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
476 @locking.ssynchronized(_config_lock)
477 def AllocateDRBDMinor(self, nodes, instance):
478 """Allocate a drbd minor.
480 The free minor will be automatically computed from the existing
481 devices. A node can be given multiple times in order to allocate
482 multiple minors. The result is the list of minors, in the same
483 order as the passed nodes.
485 @type instance: string
486 @param instance: the instance for which we allocate minors
489 assert isinstance(instance, basestring), \
490 "Invalid argument '%s' passed to AllocateDRBDMinor" % instance
492 d_map, duplicates = self._UnlockedComputeDRBDMap()
494 raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
500 # no minors used, we can start at 0
503 self._temporary_drbds[(nname, 0)] = instance
507 ffree = utils.FirstFree(keys)
509 # return the next minor
510 # TODO: implement high-limit check
514 # double-check minor against current instances
515 assert minor not in d_map[nname], \
516 ("Attempt to reuse allocated DRBD minor %d on node %s,"
517 " already allocated to instance %s" %
518 (minor, nname, d_map[nname][minor]))
519 ndata[minor] = instance
520 # double-check minor against reservation
521 r_key = (nname, minor)
522 assert r_key not in self._temporary_drbds, \
523 ("Attempt to reuse reserved DRBD minor %d on node %s,"
524 " reserved for instance %s" %
525 (minor, nname, self._temporary_drbds[r_key]))
526 self._temporary_drbds[r_key] = instance
528 logging.debug("Request to allocate drbd minors, input: %s, returning %s",
532 def _UnlockedReleaseDRBDMinors(self, instance):
533 """Release temporary drbd minors allocated for a given instance.
535 @type instance: string
536 @param instance: the instance for which temporary minors should be
540 assert isinstance(instance, basestring), \
541 "Invalid argument passed to ReleaseDRBDMinors"
542 for key, name in self._temporary_drbds.items():
544 del self._temporary_drbds[key]
546 @locking.ssynchronized(_config_lock)
547 def ReleaseDRBDMinors(self, instance):
548 """Release temporary drbd minors allocated for a given instance.
550 This should be called on the error paths, on the success paths
551 it's automatically called by the ConfigWriter add and update
554 This function is just a wrapper over L{_UnlockedReleaseDRBDMinors}.
556 @type instance: string
557 @param instance: the instance for which temporary minors should be
561 self._UnlockedReleaseDRBDMinors(instance)
563 @locking.ssynchronized(_config_lock, shared=1)
564 def GetConfigVersion(self):
565 """Get the configuration version.
567 @return: Config version
570 return self._config_data.version
572 @locking.ssynchronized(_config_lock, shared=1)
573 def GetClusterName(self):
576 @return: Cluster name
579 return self._config_data.cluster.cluster_name
581 @locking.ssynchronized(_config_lock, shared=1)
582 def GetMasterNode(self):
583 """Get the hostname of the master node for this cluster.
585 @return: Master hostname
588 return self._config_data.cluster.master_node
590 @locking.ssynchronized(_config_lock, shared=1)
591 def GetMasterIP(self):
592 """Get the IP of the master node for this cluster.
597 return self._config_data.cluster.master_ip
599 @locking.ssynchronized(_config_lock, shared=1)
600 def GetMasterNetdev(self):
601 """Get the master network device for this cluster.
604 return self._config_data.cluster.master_netdev
606 @locking.ssynchronized(_config_lock, shared=1)
607 def GetFileStorageDir(self):
608 """Get the file storage dir for this cluster.
611 return self._config_data.cluster.file_storage_dir
613 @locking.ssynchronized(_config_lock, shared=1)
614 def GetHypervisorType(self):
615 """Get the hypervisor type for this cluster.
618 return self._config_data.cluster.default_hypervisor
620 @locking.ssynchronized(_config_lock, shared=1)
621 def GetHostKey(self):
622 """Return the rsa hostkey from the config.
625 @return: the rsa hostkey
628 return self._config_data.cluster.rsahostkeypub
630 @locking.ssynchronized(_config_lock)
631 def AddInstance(self, instance):
632 """Add an instance to the config.
634 This should be used after creating a new instance.
636 @type instance: L{objects.Instance}
637 @param instance: the instance object
640 if not isinstance(instance, objects.Instance):
641 raise errors.ProgrammerError("Invalid type passed to AddInstance")
643 if instance.disk_template != constants.DT_DISKLESS:
644 all_lvs = instance.MapLVsByNode()
645 logging.info("Instance '%s' DISK_LAYOUT: %s", instance.name, all_lvs)
647 instance.serial_no = 1
648 self._config_data.instances[instance.name] = instance
649 self._config_data.cluster.serial_no += 1
650 self._UnlockedReleaseDRBDMinors(instance.name)
653 def _SetInstanceStatus(self, instance_name, status):
654 """Set the instance's status to a given value.
657 assert isinstance(status, bool), \
658 "Invalid status '%s' passed to SetInstanceStatus" % (status,)
660 if instance_name not in self._config_data.instances:
661 raise errors.ConfigurationError("Unknown instance '%s'" %
663 instance = self._config_data.instances[instance_name]
664 if instance.admin_up != status:
665 instance.admin_up = status
666 instance.serial_no += 1
669 @locking.ssynchronized(_config_lock)
670 def MarkInstanceUp(self, instance_name):
671 """Mark the instance status to up in the config.
674 self._SetInstanceStatus(instance_name, True)
676 @locking.ssynchronized(_config_lock)
677 def RemoveInstance(self, instance_name):
678 """Remove the instance from the configuration.
681 if instance_name not in self._config_data.instances:
682 raise errors.ConfigurationError("Unknown instance '%s'" % instance_name)
683 del self._config_data.instances[instance_name]
684 self._config_data.cluster.serial_no += 1
687 @locking.ssynchronized(_config_lock)
688 def RenameInstance(self, old_name, new_name):
689 """Rename an instance.
691 This needs to be done in ConfigWriter and not by RemoveInstance
692 combined with AddInstance as only we can guarantee an atomic
696 if old_name not in self._config_data.instances:
697 raise errors.ConfigurationError("Unknown instance '%s'" % old_name)
698 inst = self._config_data.instances[old_name]
699 del self._config_data.instances[old_name]
702 for disk in inst.disks:
703 if disk.dev_type == constants.LD_FILE:
704 # rename the file paths in logical and physical id
705 file_storage_dir = os.path.dirname(os.path.dirname(disk.logical_id[1]))
706 disk.physical_id = disk.logical_id = (disk.logical_id[0],
707 os.path.join(file_storage_dir,
711 self._config_data.instances[inst.name] = inst
714 @locking.ssynchronized(_config_lock)
715 def MarkInstanceDown(self, instance_name):
716 """Mark the status of an instance to down in the configuration.
719 self._SetInstanceStatus(instance_name, False)
721 def _UnlockedGetInstanceList(self):
722 """Get the list of instances.
724 This function is for internal use, when the config lock is already held.
727 return self._config_data.instances.keys()
729 @locking.ssynchronized(_config_lock, shared=1)
730 def GetInstanceList(self):
731 """Get the list of instances.
733 @return: array of instances, ex. ['instance2.example.com',
734 'instance1.example.com']
737 return self._UnlockedGetInstanceList()
739 @locking.ssynchronized(_config_lock, shared=1)
740 def ExpandInstanceName(self, short_name):
741 """Attempt to expand an incomplete instance name.
744 return utils.MatchNameComponent(short_name,
745 self._config_data.instances.keys())
747 def _UnlockedGetInstanceInfo(self, instance_name):
748 """Returns informations about an instance.
750 This function is for internal use, when the config lock is already held.
753 if instance_name not in self._config_data.instances:
756 return self._config_data.instances[instance_name]
758 @locking.ssynchronized(_config_lock, shared=1)
759 def GetInstanceInfo(self, instance_name):
760 """Returns informations about an instance.
762 It takes the information from the configuration file. Other informations of
763 an instance are taken from the live systems.
765 @param instance_name: name of the instance, e.g.
766 I{instance1.example.com}
768 @rtype: L{objects.Instance}
769 @return: the instance object
772 return self._UnlockedGetInstanceInfo(instance_name)
774 @locking.ssynchronized(_config_lock, shared=1)
775 def GetAllInstancesInfo(self):
776 """Get the configuration of all instances.
779 @returns: dict of (instance, instance_info), where instance_info is what
780 would GetInstanceInfo return for the node
783 my_dict = dict([(instance, self._UnlockedGetInstanceInfo(instance))
784 for instance in self._UnlockedGetInstanceList()])
787 @locking.ssynchronized(_config_lock)
788 def AddNode(self, node):
789 """Add a node to the configuration.
791 @type node: L{objects.Node}
792 @param node: a Node instance
795 logging.info("Adding node %s to configuration" % node.name)
798 self._config_data.nodes[node.name] = node
799 self._config_data.cluster.serial_no += 1
802 @locking.ssynchronized(_config_lock)
803 def RemoveNode(self, node_name):
804 """Remove a node from the configuration.
807 logging.info("Removing node %s from configuration" % node_name)
809 if node_name not in self._config_data.nodes:
810 raise errors.ConfigurationError("Unknown node '%s'" % node_name)
812 del self._config_data.nodes[node_name]
813 self._config_data.cluster.serial_no += 1
816 @locking.ssynchronized(_config_lock, shared=1)
817 def ExpandNodeName(self, short_name):
818 """Attempt to expand an incomplete instance name.
821 return utils.MatchNameComponent(short_name,
822 self._config_data.nodes.keys())
824 def _UnlockedGetNodeInfo(self, node_name):
825 """Get the configuration of a node, as stored in the config.
827 This function is for internal use, when the config lock is already
830 @param node_name: the node name, e.g. I{node1.example.com}
832 @rtype: L{objects.Node}
833 @return: the node object
836 if node_name not in self._config_data.nodes:
839 return self._config_data.nodes[node_name]
842 @locking.ssynchronized(_config_lock, shared=1)
843 def GetNodeInfo(self, node_name):
844 """Get the configuration of a node, as stored in the config.
846 This is just a locked wrapper over L{_UnlockedGetNodeInfo}.
848 @param node_name: the node name, e.g. I{node1.example.com}
850 @rtype: L{objects.Node}
851 @return: the node object
854 return self._UnlockedGetNodeInfo(node_name)
856 def _UnlockedGetNodeList(self):
857 """Return the list of nodes which are in the configuration.
859 This function is for internal use, when the config lock is already
865 return self._config_data.nodes.keys()
868 @locking.ssynchronized(_config_lock, shared=1)
869 def GetNodeList(self):
870 """Return the list of nodes which are in the configuration.
873 return self._UnlockedGetNodeList()
875 @locking.ssynchronized(_config_lock, shared=1)
876 def GetOnlineNodeList(self):
877 """Return the list of nodes which are online.
880 all_nodes = [self._UnlockedGetNodeInfo(node)
881 for node in self._UnlockedGetNodeList()]
882 return [node.name for node in all_nodes if not node.offline]
884 @locking.ssynchronized(_config_lock, shared=1)
885 def GetAllNodesInfo(self):
886 """Get the configuration of all nodes.
889 @return: dict of (node, node_info), where node_info is what
890 would GetNodeInfo return for the node
893 my_dict = dict([(node, self._UnlockedGetNodeInfo(node))
894 for node in self._UnlockedGetNodeList()])
897 def _UnlockedGetMasterCandidateStats(self):
898 """Get the number of current and maximum desired and possible candidates.
901 @return: tuple of (current, desired and possible)
905 for node in self._config_data.nodes.itervalues():
908 if node.master_candidate:
910 mc_max = min(mc_max, self._config_data.cluster.candidate_pool_size)
911 return (mc_now, mc_max)
913 @locking.ssynchronized(_config_lock, shared=1)
914 def GetMasterCandidateStats(self):
915 """Get the number of current and maximum possible candidates.
917 This is just a wrapper over L{_UnlockedGetMasterCandidateStats}.
920 @return: tuple of (current, max)
923 return self._UnlockedGetMasterCandidateStats()
925 @locking.ssynchronized(_config_lock)
926 def MaintainCandidatePool(self):
927 """Try to grow the candidate pool to the desired size.
930 @return: list with the adjusted nodes (L{objects.Node} instances)
933 mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
936 node_list = self._config_data.nodes.keys()
937 random.shuffle(node_list)
938 for name in node_list:
941 node = self._config_data.nodes[name]
942 if node.master_candidate or node.offline:
944 mod_list.append(node)
945 node.master_candidate = True
949 # this should not happen
950 logging.warning("Warning: MaintainCandidatePool didn't manage to"
951 " fill the candidate pool (%d/%d)", mc_now, mc_max)
953 self._config_data.cluster.serial_no += 1
958 def _BumpSerialNo(self):
959 """Bump up the serial number of the config.
962 self._config_data.serial_no += 1
964 def _OpenConfig(self):
965 """Read the config data from disk.
968 f = open(self._cfg_file, 'r')
971 data = objects.ConfigData.FromDict(serializer.Load(f.read()))
972 except Exception, err:
973 raise errors.ConfigurationError(err)
977 # Make sure the configuration has the right version
978 _ValidateConfig(data)
980 if (not hasattr(data, 'cluster') or
981 not hasattr(data.cluster, 'rsahostkeypub')):
982 raise errors.ConfigurationError("Incomplete configuration"
983 " (missing cluster.rsahostkeypub)")
984 self._config_data = data
985 # reset the last serial as -1 so that the next write will cause
987 self._last_cluster_serial = -1
989 def _DistributeConfig(self):
990 """Distribute the configuration to the other nodes.
992 Currently, this only copies the configuration file. In the future,
993 it could be used to encapsulate the 2/3-phase update mechanism.
1002 myhostname = self._my_hostname
1003 # we can skip checking whether _UnlockedGetNodeInfo returns None
1004 # since the node list comes from _UnlocketGetNodeList, and we are
1005 # called with the lock held, so no modifications should take place
1007 for node_name in self._UnlockedGetNodeList():
1008 if node_name == myhostname:
1010 node_info = self._UnlockedGetNodeInfo(node_name)
1011 if not node_info.master_candidate:
1013 node_list.append(node_info.name)
1014 addr_list.append(node_info.primary_ip)
1016 result = rpc.RpcRunner.call_upload_file(node_list, self._cfg_file,
1017 address_list=addr_list)
1018 for node in node_list:
1019 if not result[node]:
1020 logging.error("copy of file %s to node %s failed",
1021 self._cfg_file, node)
1025 def _WriteConfig(self, destination=None):
1026 """Write the configuration data to persistent storage.
1029 config_errors = self._UnlockedVerifyConfig()
1031 raise errors.ConfigurationError("Configuration data is not"
1033 (", ".join(config_errors)))
1034 if destination is None:
1035 destination = self._cfg_file
1036 self._BumpSerialNo()
1037 txt = serializer.Dump(self._config_data.ToDict())
1038 dir_name, file_name = os.path.split(destination)
1039 fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
1040 f = os.fdopen(fd, 'w')
1043 os.fsync(f.fileno())
1046 # we don't need to do os.close(fd) as f.close() did it
1047 os.rename(name, destination)
1048 self.write_count += 1
1050 # and redistribute the config file to master candidates
1051 self._DistributeConfig()
1053 # Write ssconf files on all nodes (including locally)
1054 if self._last_cluster_serial < self._config_data.cluster.serial_no:
1055 if not self._offline:
1056 rpc.RpcRunner.call_write_ssconf_files(self._UnlockedGetNodeList(),
1057 self._UnlockedGetSsconfValues())
1058 self._last_cluster_serial = self._config_data.cluster.serial_no
1060 def _UnlockedGetSsconfValues(self):
1061 """Return the values needed by ssconf.
1064 @return: a dictionary with keys the ssconf names and values their
1069 instance_names = utils.NiceSort(self._UnlockedGetInstanceList())
1070 node_names = utils.NiceSort(self._UnlockedGetNodeList())
1071 node_info = [self._UnlockedGetNodeInfo(name) for name in node_names]
1073 instance_data = fn(instance_names)
1074 off_data = fn(node.name for node in node_info if node.offline)
1075 on_data = fn(node.name for node in node_info if not node.offline)
1076 mc_data = fn(node.name for node in node_info if node.master_candidate)
1077 node_data = fn(node_names)
1079 cluster = self._config_data.cluster
1081 constants.SS_CLUSTER_NAME: cluster.cluster_name,
1082 constants.SS_FILE_STORAGE_DIR: cluster.file_storage_dir,
1083 constants.SS_MASTER_CANDIDATES: mc_data,
1084 constants.SS_MASTER_IP: cluster.master_ip,
1085 constants.SS_MASTER_NETDEV: cluster.master_netdev,
1086 constants.SS_MASTER_NODE: cluster.master_node,
1087 constants.SS_NODE_LIST: node_data,
1088 constants.SS_OFFLINE_NODES: off_data,
1089 constants.SS_ONLINE_NODES: on_data,
1090 constants.SS_INSTANCE_LIST: instance_data,
1091 constants.SS_RELEASE_VERSION: constants.RELEASE_VERSION,
1094 @locking.ssynchronized(_config_lock)
1095 def InitConfig(self, version, cluster_config, master_node_config):
1096 """Create the initial cluster configuration.
1098 It will contain the current node, which will also be the master
1099 node, and no instances.
1102 @param version: Configuration version
1103 @type cluster_config: objects.Cluster
1104 @param cluster_config: Cluster configuration
1105 @type master_node_config: objects.Node
1106 @param master_node_config: Master node configuration
1110 master_node_config.name: master_node_config,
1113 self._config_data = objects.ConfigData(version=version,
1114 cluster=cluster_config,
1120 @locking.ssynchronized(_config_lock, shared=1)
1121 def GetVGName(self):
1122 """Return the volume group name.
1125 return self._config_data.cluster.volume_group_name
1127 @locking.ssynchronized(_config_lock)
1128 def SetVGName(self, vg_name):
1129 """Set the volume group name.
1132 self._config_data.cluster.volume_group_name = vg_name
1133 self._config_data.cluster.serial_no += 1
1136 @locking.ssynchronized(_config_lock, shared=1)
1137 def GetDefBridge(self):
1138 """Return the default bridge.
1141 return self._config_data.cluster.default_bridge
1143 @locking.ssynchronized(_config_lock, shared=1)
1144 def GetMACPrefix(self):
1145 """Return the mac prefix.
1148 return self._config_data.cluster.mac_prefix
1150 @locking.ssynchronized(_config_lock, shared=1)
1151 def GetClusterInfo(self):
1152 """Returns informations about the cluster
1154 @rtype: L{objects.Cluster}
1155 @return: the cluster object
1158 return self._config_data.cluster
1160 @locking.ssynchronized(_config_lock)
1161 def Update(self, target):
1162 """Notify function to be called after updates.
1164 This function must be called when an object (as returned by
1165 GetInstanceInfo, GetNodeInfo, GetCluster) has been updated and the
1166 caller wants the modifications saved to the backing store. Note
1167 that all modified objects will be saved, but the target argument
1168 is the one the caller wants to ensure that it's saved.
1170 @param target: an instance of either L{objects.Cluster},
1171 L{objects.Node} or L{objects.Instance} which is existing in
1175 if self._config_data is None:
1176 raise errors.ProgrammerError("Configuration file not read,"
1178 update_serial = False
1179 if isinstance(target, objects.Cluster):
1180 test = target == self._config_data.cluster
1181 elif isinstance(target, objects.Node):
1182 test = target in self._config_data.nodes.values()
1183 update_serial = True
1184 elif isinstance(target, objects.Instance):
1185 test = target in self._config_data.instances.values()
1187 raise errors.ProgrammerError("Invalid object type (%s) passed to"
1188 " ConfigWriter.Update" % type(target))
1190 raise errors.ConfigurationError("Configuration updated since object"
1191 " has been read or unknown object")
1192 target.serial_no += 1
1195 # for node updates, we need to increase the cluster serial too
1196 self._config_data.cluster.serial_no += 1
1198 if isinstance(target, objects.Instance):
1199 self._UnlockedReleaseDRBDMinors(target.name)