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 self._temporary_macs = set()
83 # Note: in order to prevent errors when resolving our name in
84 # _DistributeConfig, we compute it here once and reuse it; it's
85 # better to raise an error before starting to modify the config
86 # file than after it was modified
87 self._my_hostname = utils.HostInfo().name
88 self._last_cluster_serial = -1
91 # this method needs to be static, so that we can call it on the class
94 """Check if the cluster is configured.
97 return os.path.exists(constants.CLUSTER_CONF_FILE)
99 @locking.ssynchronized(_config_lock, shared=1)
100 def GenerateMAC(self):
101 """Generate a MAC for an instance.
103 This should check the current instances for duplicates.
106 prefix = self._config_data.cluster.mac_prefix
107 all_macs = self._AllMACs()
110 byte1 = random.randrange(0, 256)
111 byte2 = random.randrange(0, 256)
112 byte3 = random.randrange(0, 256)
113 mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
114 if mac not in all_macs and mac not in self._temporary_macs:
118 raise errors.ConfigurationError("Can't generate unique MAC")
119 self._temporary_macs.add(mac)
122 @locking.ssynchronized(_config_lock, shared=1)
123 def IsMacInUse(self, mac):
124 """Predicate: check if the specified MAC is in use in the Ganeti cluster.
126 This only checks instances managed by this cluster, it does not
127 check for potential collisions elsewhere.
130 all_macs = self._AllMACs()
131 return mac in all_macs or mac in self._temporary_macs
133 @locking.ssynchronized(_config_lock, shared=1)
134 def GenerateDRBDSecret(self):
135 """Generate a DRBD secret.
137 This checks the current disks for duplicates.
140 all_secrets = self._AllDRBDSecrets()
143 secret = utils.GenerateSecret()
144 if secret not in all_secrets:
148 raise errors.ConfigurationError("Can't generate unique DRBD secret")
151 def _ComputeAllLVs(self):
152 """Compute the list of all LVs.
156 for instance in self._config_data.instances.values():
157 node_data = instance.MapLVsByNode()
158 for lv_list in node_data.values():
159 lvnames.update(lv_list)
162 @locking.ssynchronized(_config_lock, shared=1)
163 def GenerateUniqueID(self, exceptions=None):
164 """Generate an unique disk name.
166 This checks the current node, instances and disk names for
169 @param exceptions: a list with some other names which should be checked
170 for uniqueness (used for example when you want to get
171 more than one id at one time without adding each one in
172 turn to the config file)
175 @return: the unique id
179 existing.update(self._temporary_ids)
180 existing.update(self._ComputeAllLVs())
181 existing.update(self._config_data.instances.keys())
182 existing.update(self._config_data.nodes.keys())
183 if exceptions is not None:
184 existing.update(exceptions)
187 unique_id = utils.NewUUID()
188 if unique_id not in existing and unique_id is not None:
191 raise errors.ConfigurationError("Not able generate an unique ID"
192 " (last tried ID: %s" % unique_id)
193 self._temporary_ids.add(unique_id)
197 """Return all MACs present in the config.
200 @return: the list of all MACs
204 for instance in self._config_data.instances.values():
205 for nic in instance.nics:
206 result.append(nic.mac)
210 def _AllDRBDSecrets(self):
211 """Return all DRBD secrets present in the config.
214 @return: the list of all DRBD secrets
217 def helper(disk, result):
218 """Recursively gather secrets from this disk."""
219 if disk.dev_type == constants.DT_DRBD8:
220 result.append(disk.logical_id[5])
222 for child in disk.children:
223 helper(child, result)
226 for instance in self._config_data.instances.values():
227 for disk in instance.disks:
232 def _CheckDiskIDs(self, disk, l_ids, p_ids):
233 """Compute duplicate disk IDs
235 @type disk: L{objects.Disk}
236 @param disk: the disk at which to start searching
238 @param l_ids: list of current logical ids
240 @param p_ids: list of current physical ids
242 @return: a list of error messages
246 if disk.logical_id is not None:
247 if disk.logical_id in l_ids:
248 result.append("duplicate logical id %s" % str(disk.logical_id))
250 l_ids.append(disk.logical_id)
251 if disk.physical_id is not None:
252 if disk.physical_id in p_ids:
253 result.append("duplicate physical id %s" % str(disk.physical_id))
255 p_ids.append(disk.physical_id)
258 for child in disk.children:
259 result.extend(self._CheckDiskIDs(child, l_ids, p_ids))
262 def _UnlockedVerifyConfig(self):
266 @return: a list of error messages; a non-empty list signifies
273 data = self._config_data
276 for instance_name in data.instances:
277 instance = data.instances[instance_name]
278 if instance.primary_node not in data.nodes:
279 result.append("instance '%s' has invalid primary node '%s'" %
280 (instance_name, instance.primary_node))
281 for snode in instance.secondary_nodes:
282 if snode not in data.nodes:
283 result.append("instance '%s' has invalid secondary node '%s'" %
284 (instance_name, snode))
285 for idx, nic in enumerate(instance.nics):
286 if nic.mac in seen_macs:
287 result.append("instance '%s' has NIC %d mac %s duplicate" %
288 (instance_name, idx, nic.mac))
290 seen_macs.append(nic.mac)
292 # gather the drbd ports for duplicate checks
293 for dsk in instance.disks:
294 if dsk.dev_type in constants.LDS_DRBD:
295 tcp_port = dsk.logical_id[2]
296 if tcp_port not in ports:
298 ports[tcp_port].append((instance.name, "drbd disk %s" % dsk.iv_name))
299 # gather network port reservation
300 net_port = getattr(instance, "network_port", None)
301 if net_port is not None:
302 if net_port not in ports:
304 ports[net_port].append((instance.name, "network port"))
306 # instance disk verify
307 for idx, disk in enumerate(instance.disks):
308 result.extend(["instance '%s' disk %d error: %s" %
309 (instance.name, idx, msg) for msg in disk.Verify()])
310 result.extend(self._CheckDiskIDs(disk, seen_lids, seen_pids))
312 # cluster-wide pool of free ports
313 for free_port in data.cluster.tcpudp_port_pool:
314 if free_port not in ports:
315 ports[free_port] = []
316 ports[free_port].append(("cluster", "port marked as free"))
318 # compute tcp/udp duplicate ports
324 txt = ", ".join(["%s/%s" % val for val in pdata])
325 result.append("tcp/udp port %s has duplicates: %s" % (pnum, txt))
327 # highest used tcp port check
329 if keys[-1] > data.cluster.highest_used_port:
330 result.append("Highest used port mismatch, saved %s, computed %s" %
331 (data.cluster.highest_used_port, keys[-1]))
333 if not data.nodes[data.cluster.master_node].master_candidate:
334 result.append("Master node is not a master candidate")
336 # master candidate checks
337 mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
339 result.append("Not enough master candidates: actual %d, target %d" %
343 for node in data.nodes.values():
344 if [node.master_candidate, node.drained, node.offline].count(True) > 1:
345 result.append("Node %s state is invalid: master_candidate=%s,"
346 " drain=%s, offline=%s" %
347 (node.name, node.master_candidate, node.drain,
351 d_map, duplicates = self._UnlockedComputeDRBDMap()
352 for node, minor, instance_a, instance_b in duplicates:
353 result.append("DRBD minor %d on node %s is assigned twice to instances"
354 " %s and %s" % (minor, node, instance_a, instance_b))
358 @locking.ssynchronized(_config_lock, shared=1)
359 def VerifyConfig(self):
362 This is just a wrapper over L{_UnlockedVerifyConfig}.
365 @return: a list of error messages; a non-empty list signifies
369 return self._UnlockedVerifyConfig()
371 def _UnlockedSetDiskID(self, disk, node_name):
372 """Convert the unique ID to the ID needed on the target nodes.
374 This is used only for drbd, which needs ip/port configuration.
376 The routine descends down and updates its children also, because
377 this helps when the only the top device is passed to the remote
380 This function is for internal use, when the config lock is already held.
384 for child in disk.children:
385 self._UnlockedSetDiskID(child, node_name)
387 if disk.logical_id is None and disk.physical_id is not None:
389 if disk.dev_type == constants.LD_DRBD8:
390 pnode, snode, port, pminor, sminor, secret = disk.logical_id
391 if node_name not in (pnode, snode):
392 raise errors.ConfigurationError("DRBD device not knowing node %s" %
394 pnode_info = self._UnlockedGetNodeInfo(pnode)
395 snode_info = self._UnlockedGetNodeInfo(snode)
396 if pnode_info is None or snode_info is None:
397 raise errors.ConfigurationError("Can't find primary or secondary node"
398 " for %s" % str(disk))
399 p_data = (pnode_info.secondary_ip, port)
400 s_data = (snode_info.secondary_ip, port)
401 if pnode == node_name:
402 disk.physical_id = p_data + s_data + (pminor, secret)
403 else: # it must be secondary, we tested above
404 disk.physical_id = s_data + p_data + (sminor, secret)
406 disk.physical_id = disk.logical_id
409 @locking.ssynchronized(_config_lock)
410 def SetDiskID(self, disk, node_name):
411 """Convert the unique ID to the ID needed on the target nodes.
413 This is used only for drbd, which needs ip/port configuration.
415 The routine descends down and updates its children also, because
416 this helps when the only the top device is passed to the remote
420 return self._UnlockedSetDiskID(disk, node_name)
422 @locking.ssynchronized(_config_lock)
423 def AddTcpUdpPort(self, port):
424 """Adds a new port to the available port pool.
427 if not isinstance(port, int):
428 raise errors.ProgrammerError("Invalid type passed for port")
430 self._config_data.cluster.tcpudp_port_pool.add(port)
433 @locking.ssynchronized(_config_lock, shared=1)
434 def GetPortList(self):
435 """Returns a copy of the current port list.
438 return self._config_data.cluster.tcpudp_port_pool.copy()
440 @locking.ssynchronized(_config_lock)
441 def AllocatePort(self):
444 The port will be taken from the available port pool or from the
445 default port range (and in this case we increase
449 # If there are TCP/IP ports configured, we use them first.
450 if self._config_data.cluster.tcpudp_port_pool:
451 port = self._config_data.cluster.tcpudp_port_pool.pop()
453 port = self._config_data.cluster.highest_used_port + 1
454 if port >= constants.LAST_DRBD_PORT:
455 raise errors.ConfigurationError("The highest used port is greater"
456 " than %s. Aborting." %
457 constants.LAST_DRBD_PORT)
458 self._config_data.cluster.highest_used_port = port
463 def _UnlockedComputeDRBDMap(self):
464 """Compute the used DRBD minor/nodes.
467 @return: dictionary of node_name: dict of minor: instance_name;
468 the returned dict will have all the nodes in it (even if with
469 an empty list), and a list of duplicates; if the duplicates
470 list is not empty, the configuration is corrupted and its caller
471 should raise an exception
474 def _AppendUsedPorts(instance_name, disk, used):
476 if disk.dev_type == constants.LD_DRBD8 and len(disk.logical_id) >= 5:
477 nodeA, nodeB, dummy, minorA, minorB = disk.logical_id[:5]
478 for node, port in ((nodeA, minorA), (nodeB, minorB)):
479 assert node in used, ("Node '%s' of instance '%s' not found"
480 " in node list" % (node, instance_name))
481 if port in used[node]:
482 duplicates.append((node, port, instance_name, used[node][port]))
484 used[node][port] = instance_name
486 for child in disk.children:
487 duplicates.extend(_AppendUsedPorts(instance_name, child, used))
491 my_dict = dict((node, {}) for node in self._config_data.nodes)
492 for instance in self._config_data.instances.itervalues():
493 for disk in instance.disks:
494 duplicates.extend(_AppendUsedPorts(instance.name, disk, my_dict))
495 for (node, minor), instance in self._temporary_drbds.iteritems():
496 if minor in my_dict[node] and my_dict[node][minor] != instance:
497 duplicates.append((node, minor, instance, my_dict[node][minor]))
499 my_dict[node][minor] = instance
500 return my_dict, duplicates
502 @locking.ssynchronized(_config_lock)
503 def ComputeDRBDMap(self):
504 """Compute the used DRBD minor/nodes.
506 This is just a wrapper over L{_UnlockedComputeDRBDMap}.
508 @return: dictionary of node_name: dict of minor: instance_name;
509 the returned dict will have all the nodes in it (even if with
513 d_map, duplicates = self._UnlockedComputeDRBDMap()
515 raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
519 @locking.ssynchronized(_config_lock)
520 def AllocateDRBDMinor(self, nodes, instance):
521 """Allocate a drbd minor.
523 The free minor will be automatically computed from the existing
524 devices. A node can be given multiple times in order to allocate
525 multiple minors. The result is the list of minors, in the same
526 order as the passed nodes.
528 @type instance: string
529 @param instance: the instance for which we allocate minors
532 assert isinstance(instance, basestring), \
533 "Invalid argument '%s' passed to AllocateDRBDMinor" % instance
535 d_map, duplicates = self._UnlockedComputeDRBDMap()
537 raise errors.ConfigurationError("Duplicate DRBD ports detected: %s" %
543 # no minors used, we can start at 0
546 self._temporary_drbds[(nname, 0)] = instance
550 ffree = utils.FirstFree(keys)
552 # return the next minor
553 # TODO: implement high-limit check
557 # double-check minor against current instances
558 assert minor not in d_map[nname], \
559 ("Attempt to reuse allocated DRBD minor %d on node %s,"
560 " already allocated to instance %s" %
561 (minor, nname, d_map[nname][minor]))
562 ndata[minor] = instance
563 # double-check minor against reservation
564 r_key = (nname, minor)
565 assert r_key not in self._temporary_drbds, \
566 ("Attempt to reuse reserved DRBD minor %d on node %s,"
567 " reserved for instance %s" %
568 (minor, nname, self._temporary_drbds[r_key]))
569 self._temporary_drbds[r_key] = instance
571 logging.debug("Request to allocate drbd minors, input: %s, returning %s",
575 def _UnlockedReleaseDRBDMinors(self, instance):
576 """Release temporary drbd minors allocated for a given instance.
578 @type instance: string
579 @param instance: the instance for which temporary minors should be
583 assert isinstance(instance, basestring), \
584 "Invalid argument passed to ReleaseDRBDMinors"
585 for key, name in self._temporary_drbds.items():
587 del self._temporary_drbds[key]
589 @locking.ssynchronized(_config_lock)
590 def ReleaseDRBDMinors(self, instance):
591 """Release temporary drbd minors allocated for a given instance.
593 This should be called on the error paths, on the success paths
594 it's automatically called by the ConfigWriter add and update
597 This function is just a wrapper over L{_UnlockedReleaseDRBDMinors}.
599 @type instance: string
600 @param instance: the instance for which temporary minors should be
604 self._UnlockedReleaseDRBDMinors(instance)
606 @locking.ssynchronized(_config_lock, shared=1)
607 def GetConfigVersion(self):
608 """Get the configuration version.
610 @return: Config version
613 return self._config_data.version
615 @locking.ssynchronized(_config_lock, shared=1)
616 def GetClusterName(self):
619 @return: Cluster name
622 return self._config_data.cluster.cluster_name
624 @locking.ssynchronized(_config_lock, shared=1)
625 def GetMasterNode(self):
626 """Get the hostname of the master node for this cluster.
628 @return: Master hostname
631 return self._config_data.cluster.master_node
633 @locking.ssynchronized(_config_lock, shared=1)
634 def GetMasterIP(self):
635 """Get the IP of the master node for this cluster.
640 return self._config_data.cluster.master_ip
642 @locking.ssynchronized(_config_lock, shared=1)
643 def GetMasterNetdev(self):
644 """Get the master network device for this cluster.
647 return self._config_data.cluster.master_netdev
649 @locking.ssynchronized(_config_lock, shared=1)
650 def GetFileStorageDir(self):
651 """Get the file storage dir for this cluster.
654 return self._config_data.cluster.file_storage_dir
656 @locking.ssynchronized(_config_lock, shared=1)
657 def GetHypervisorType(self):
658 """Get the hypervisor type for this cluster.
661 return self._config_data.cluster.default_hypervisor
663 @locking.ssynchronized(_config_lock, shared=1)
664 def GetHostKey(self):
665 """Return the rsa hostkey from the config.
668 @return: the rsa hostkey
671 return self._config_data.cluster.rsahostkeypub
673 @locking.ssynchronized(_config_lock)
674 def AddInstance(self, instance):
675 """Add an instance to the config.
677 This should be used after creating a new instance.
679 @type instance: L{objects.Instance}
680 @param instance: the instance object
683 if not isinstance(instance, objects.Instance):
684 raise errors.ProgrammerError("Invalid type passed to AddInstance")
686 if instance.disk_template != constants.DT_DISKLESS:
687 all_lvs = instance.MapLVsByNode()
688 logging.info("Instance '%s' DISK_LAYOUT: %s", instance.name, all_lvs)
690 instance.serial_no = 1
691 self._config_data.instances[instance.name] = instance
692 self._config_data.cluster.serial_no += 1
693 self._UnlockedReleaseDRBDMinors(instance.name)
694 for nic in instance.nics:
695 self._temporary_macs.discard(nic.mac)
698 def _SetInstanceStatus(self, instance_name, status):
699 """Set the instance's status to a given value.
702 assert isinstance(status, bool), \
703 "Invalid status '%s' passed to SetInstanceStatus" % (status,)
705 if instance_name not in self._config_data.instances:
706 raise errors.ConfigurationError("Unknown instance '%s'" %
708 instance = self._config_data.instances[instance_name]
709 if instance.admin_up != status:
710 instance.admin_up = status
711 instance.serial_no += 1
714 @locking.ssynchronized(_config_lock)
715 def MarkInstanceUp(self, instance_name):
716 """Mark the instance status to up in the config.
719 self._SetInstanceStatus(instance_name, True)
721 @locking.ssynchronized(_config_lock)
722 def RemoveInstance(self, instance_name):
723 """Remove the instance from the configuration.
726 if instance_name not in self._config_data.instances:
727 raise errors.ConfigurationError("Unknown instance '%s'" % instance_name)
728 del self._config_data.instances[instance_name]
729 self._config_data.cluster.serial_no += 1
732 @locking.ssynchronized(_config_lock)
733 def RenameInstance(self, old_name, new_name):
734 """Rename an instance.
736 This needs to be done in ConfigWriter and not by RemoveInstance
737 combined with AddInstance as only we can guarantee an atomic
741 if old_name not in self._config_data.instances:
742 raise errors.ConfigurationError("Unknown instance '%s'" % old_name)
743 inst = self._config_data.instances[old_name]
744 del self._config_data.instances[old_name]
747 for disk in inst.disks:
748 if disk.dev_type == constants.LD_FILE:
749 # rename the file paths in logical and physical id
750 file_storage_dir = os.path.dirname(os.path.dirname(disk.logical_id[1]))
751 disk.physical_id = disk.logical_id = (disk.logical_id[0],
752 os.path.join(file_storage_dir,
756 self._config_data.instances[inst.name] = inst
759 @locking.ssynchronized(_config_lock)
760 def MarkInstanceDown(self, instance_name):
761 """Mark the status of an instance to down in the configuration.
764 self._SetInstanceStatus(instance_name, False)
766 def _UnlockedGetInstanceList(self):
767 """Get the list of instances.
769 This function is for internal use, when the config lock is already held.
772 return self._config_data.instances.keys()
774 @locking.ssynchronized(_config_lock, shared=1)
775 def GetInstanceList(self):
776 """Get the list of instances.
778 @return: array of instances, ex. ['instance2.example.com',
779 'instance1.example.com']
782 return self._UnlockedGetInstanceList()
784 @locking.ssynchronized(_config_lock, shared=1)
785 def ExpandInstanceName(self, short_name):
786 """Attempt to expand an incomplete instance name.
789 return utils.MatchNameComponent(short_name,
790 self._config_data.instances.keys())
792 def _UnlockedGetInstanceInfo(self, instance_name):
793 """Returns informations about an instance.
795 This function is for internal use, when the config lock is already held.
798 if instance_name not in self._config_data.instances:
801 return self._config_data.instances[instance_name]
803 @locking.ssynchronized(_config_lock, shared=1)
804 def GetInstanceInfo(self, instance_name):
805 """Returns informations about an instance.
807 It takes the information from the configuration file. Other informations of
808 an instance are taken from the live systems.
810 @param instance_name: name of the instance, e.g.
811 I{instance1.example.com}
813 @rtype: L{objects.Instance}
814 @return: the instance object
817 return self._UnlockedGetInstanceInfo(instance_name)
819 @locking.ssynchronized(_config_lock, shared=1)
820 def GetAllInstancesInfo(self):
821 """Get the configuration of all instances.
824 @returns: dict of (instance, instance_info), where instance_info is what
825 would GetInstanceInfo return for the node
828 my_dict = dict([(instance, self._UnlockedGetInstanceInfo(instance))
829 for instance in self._UnlockedGetInstanceList()])
832 @locking.ssynchronized(_config_lock)
833 def AddNode(self, node):
834 """Add a node to the configuration.
836 @type node: L{objects.Node}
837 @param node: a Node instance
840 logging.info("Adding node %s to configuration" % node.name)
843 self._config_data.nodes[node.name] = node
844 self._config_data.cluster.serial_no += 1
847 @locking.ssynchronized(_config_lock)
848 def RemoveNode(self, node_name):
849 """Remove a node from the configuration.
852 logging.info("Removing node %s from configuration" % node_name)
854 if node_name not in self._config_data.nodes:
855 raise errors.ConfigurationError("Unknown node '%s'" % node_name)
857 del self._config_data.nodes[node_name]
858 self._config_data.cluster.serial_no += 1
861 @locking.ssynchronized(_config_lock, shared=1)
862 def ExpandNodeName(self, short_name):
863 """Attempt to expand an incomplete instance name.
866 return utils.MatchNameComponent(short_name,
867 self._config_data.nodes.keys())
869 def _UnlockedGetNodeInfo(self, node_name):
870 """Get the configuration of a node, as stored in the config.
872 This function is for internal use, when the config lock is already
875 @param node_name: the node name, e.g. I{node1.example.com}
877 @rtype: L{objects.Node}
878 @return: the node object
881 if node_name not in self._config_data.nodes:
884 return self._config_data.nodes[node_name]
887 @locking.ssynchronized(_config_lock, shared=1)
888 def GetNodeInfo(self, node_name):
889 """Get the configuration of a node, as stored in the config.
891 This is just a locked wrapper over L{_UnlockedGetNodeInfo}.
893 @param node_name: the node name, e.g. I{node1.example.com}
895 @rtype: L{objects.Node}
896 @return: the node object
899 return self._UnlockedGetNodeInfo(node_name)
901 def _UnlockedGetNodeList(self):
902 """Return the list of nodes which are in the configuration.
904 This function is for internal use, when the config lock is already
910 return self._config_data.nodes.keys()
913 @locking.ssynchronized(_config_lock, shared=1)
914 def GetNodeList(self):
915 """Return the list of nodes which are in the configuration.
918 return self._UnlockedGetNodeList()
920 @locking.ssynchronized(_config_lock, shared=1)
921 def GetOnlineNodeList(self):
922 """Return the list of nodes which are online.
925 all_nodes = [self._UnlockedGetNodeInfo(node)
926 for node in self._UnlockedGetNodeList()]
927 return [node.name for node in all_nodes if not node.offline]
929 @locking.ssynchronized(_config_lock, shared=1)
930 def GetAllNodesInfo(self):
931 """Get the configuration of all nodes.
934 @return: dict of (node, node_info), where node_info is what
935 would GetNodeInfo return for the node
938 my_dict = dict([(node, self._UnlockedGetNodeInfo(node))
939 for node in self._UnlockedGetNodeList()])
942 def _UnlockedGetMasterCandidateStats(self):
943 """Get the number of current and maximum desired and possible candidates.
946 @return: tuple of (current, desired and possible)
950 for node in self._config_data.nodes.itervalues():
951 if not (node.offline or node.drained):
953 if node.master_candidate:
955 mc_max = min(mc_max, self._config_data.cluster.candidate_pool_size)
956 return (mc_now, mc_max)
958 @locking.ssynchronized(_config_lock, shared=1)
959 def GetMasterCandidateStats(self):
960 """Get the number of current and maximum possible candidates.
962 This is just a wrapper over L{_UnlockedGetMasterCandidateStats}.
965 @return: tuple of (current, max)
968 return self._UnlockedGetMasterCandidateStats()
970 @locking.ssynchronized(_config_lock)
971 def MaintainCandidatePool(self):
972 """Try to grow the candidate pool to the desired size.
975 @return: list with the adjusted nodes (L{objects.Node} instances)
978 mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
981 node_list = self._config_data.nodes.keys()
982 random.shuffle(node_list)
983 for name in node_list:
986 node = self._config_data.nodes[name]
987 if node.master_candidate or node.offline or node.drained:
989 mod_list.append(node)
990 node.master_candidate = True
994 # this should not happen
995 logging.warning("Warning: MaintainCandidatePool didn't manage to"
996 " fill the candidate pool (%d/%d)", mc_now, mc_max)
998 self._config_data.cluster.serial_no += 1
1003 def _BumpSerialNo(self):
1004 """Bump up the serial number of the config.
1007 self._config_data.serial_no += 1
1009 def _OpenConfig(self):
1010 """Read the config data from disk.
1013 f = open(self._cfg_file, 'r')
1016 data = objects.ConfigData.FromDict(serializer.Load(f.read()))
1017 except Exception, err:
1018 raise errors.ConfigurationError(err)
1022 # Make sure the configuration has the right version
1023 _ValidateConfig(data)
1025 if (not hasattr(data, 'cluster') or
1026 not hasattr(data.cluster, 'rsahostkeypub')):
1027 raise errors.ConfigurationError("Incomplete configuration"
1028 " (missing cluster.rsahostkeypub)")
1029 self._config_data = data
1030 # reset the last serial as -1 so that the next write will cause
1032 self._last_cluster_serial = -1
1034 def _DistributeConfig(self):
1035 """Distribute the configuration to the other nodes.
1037 Currently, this only copies the configuration file. In the future,
1038 it could be used to encapsulate the 2/3-phase update mechanism.
1047 myhostname = self._my_hostname
1048 # we can skip checking whether _UnlockedGetNodeInfo returns None
1049 # since the node list comes from _UnlocketGetNodeList, and we are
1050 # called with the lock held, so no modifications should take place
1052 for node_name in self._UnlockedGetNodeList():
1053 if node_name == myhostname:
1055 node_info = self._UnlockedGetNodeInfo(node_name)
1056 if not node_info.master_candidate:
1058 node_list.append(node_info.name)
1059 addr_list.append(node_info.primary_ip)
1061 result = rpc.RpcRunner.call_upload_file(node_list, self._cfg_file,
1062 address_list=addr_list)
1063 for node in node_list:
1064 if not result[node]:
1065 logging.error("copy of file %s to node %s failed",
1066 self._cfg_file, node)
1070 def _WriteConfig(self, destination=None):
1071 """Write the configuration data to persistent storage.
1074 config_errors = self._UnlockedVerifyConfig()
1076 raise errors.ConfigurationError("Configuration data is not"
1078 (", ".join(config_errors)))
1079 if destination is None:
1080 destination = self._cfg_file
1081 self._BumpSerialNo()
1082 txt = serializer.Dump(self._config_data.ToDict())
1083 dir_name, file_name = os.path.split(destination)
1084 fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
1085 f = os.fdopen(fd, 'w')
1088 os.fsync(f.fileno())
1091 # we don't need to do os.close(fd) as f.close() did it
1092 os.rename(name, destination)
1093 self.write_count += 1
1095 # and redistribute the config file to master candidates
1096 self._DistributeConfig()
1098 # Write ssconf files on all nodes (including locally)
1099 if self._last_cluster_serial < self._config_data.cluster.serial_no:
1100 if not self._offline:
1101 rpc.RpcRunner.call_write_ssconf_files(self._UnlockedGetNodeList(),
1102 self._UnlockedGetSsconfValues())
1103 self._last_cluster_serial = self._config_data.cluster.serial_no
1105 def _UnlockedGetSsconfValues(self):
1106 """Return the values needed by ssconf.
1109 @return: a dictionary with keys the ssconf names and values their
1114 instance_names = utils.NiceSort(self._UnlockedGetInstanceList())
1115 node_names = utils.NiceSort(self._UnlockedGetNodeList())
1116 node_info = [self._UnlockedGetNodeInfo(name) for name in node_names]
1118 instance_data = fn(instance_names)
1119 off_data = fn(node.name for node in node_info if node.offline)
1120 on_data = fn(node.name for node in node_info if not node.offline)
1121 mc_data = fn(node.name for node in node_info if node.master_candidate)
1122 node_data = fn(node_names)
1124 cluster = self._config_data.cluster
1126 constants.SS_CLUSTER_NAME: cluster.cluster_name,
1127 constants.SS_FILE_STORAGE_DIR: cluster.file_storage_dir,
1128 constants.SS_MASTER_CANDIDATES: mc_data,
1129 constants.SS_MASTER_IP: cluster.master_ip,
1130 constants.SS_MASTER_NETDEV: cluster.master_netdev,
1131 constants.SS_MASTER_NODE: cluster.master_node,
1132 constants.SS_NODE_LIST: node_data,
1133 constants.SS_OFFLINE_NODES: off_data,
1134 constants.SS_ONLINE_NODES: on_data,
1135 constants.SS_INSTANCE_LIST: instance_data,
1136 constants.SS_RELEASE_VERSION: constants.RELEASE_VERSION,
1139 @locking.ssynchronized(_config_lock)
1140 def InitConfig(self, version, cluster_config, master_node_config):
1141 """Create the initial cluster configuration.
1143 It will contain the current node, which will also be the master
1144 node, and no instances.
1147 @param version: Configuration version
1148 @type cluster_config: objects.Cluster
1149 @param cluster_config: Cluster configuration
1150 @type master_node_config: objects.Node
1151 @param master_node_config: Master node configuration
1155 master_node_config.name: master_node_config,
1158 self._config_data = objects.ConfigData(version=version,
1159 cluster=cluster_config,
1165 @locking.ssynchronized(_config_lock, shared=1)
1166 def GetVGName(self):
1167 """Return the volume group name.
1170 return self._config_data.cluster.volume_group_name
1172 @locking.ssynchronized(_config_lock)
1173 def SetVGName(self, vg_name):
1174 """Set the volume group name.
1177 self._config_data.cluster.volume_group_name = vg_name
1178 self._config_data.cluster.serial_no += 1
1181 @locking.ssynchronized(_config_lock, shared=1)
1182 def GetDefBridge(self):
1183 """Return the default bridge.
1186 return self._config_data.cluster.default_bridge
1188 @locking.ssynchronized(_config_lock, shared=1)
1189 def GetMACPrefix(self):
1190 """Return the mac prefix.
1193 return self._config_data.cluster.mac_prefix
1195 @locking.ssynchronized(_config_lock, shared=1)
1196 def GetClusterInfo(self):
1197 """Returns informations about the cluster
1199 @rtype: L{objects.Cluster}
1200 @return: the cluster object
1203 return self._config_data.cluster
1205 @locking.ssynchronized(_config_lock)
1206 def Update(self, target):
1207 """Notify function to be called after updates.
1209 This function must be called when an object (as returned by
1210 GetInstanceInfo, GetNodeInfo, GetCluster) has been updated and the
1211 caller wants the modifications saved to the backing store. Note
1212 that all modified objects will be saved, but the target argument
1213 is the one the caller wants to ensure that it's saved.
1215 @param target: an instance of either L{objects.Cluster},
1216 L{objects.Node} or L{objects.Instance} which is existing in
1220 if self._config_data is None:
1221 raise errors.ProgrammerError("Configuration file not read,"
1223 update_serial = False
1224 if isinstance(target, objects.Cluster):
1225 test = target == self._config_data.cluster
1226 elif isinstance(target, objects.Node):
1227 test = target in self._config_data.nodes.values()
1228 update_serial = True
1229 elif isinstance(target, objects.Instance):
1230 test = target in self._config_data.instances.values()
1232 raise errors.ProgrammerError("Invalid object type (%s) passed to"
1233 " ConfigWriter.Update" % type(target))
1235 raise errors.ConfigurationError("Configuration updated since object"
1236 " has been read or unknown object")
1237 target.serial_no += 1
1240 # for node updates, we need to increase the cluster serial too
1241 self._config_data.cluster.serial_no += 1
1243 if isinstance(target, objects.Instance):
1244 self._UnlockedReleaseDRBDMinors(target.name)
1245 for nic in target.nics:
1246 self._temporary_macs.discard(nic.mac)