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
24 This module implements the data structures which define the cluster
25 operations - the so-called opcodes.
27 Every operation which modifies the cluster state is expressed via
32 # this are practically structures, so disable the message about too
34 # pylint: disable-msg=R0903
37 class BaseOpCode(object):
38 """A simple serializable object.
40 This object serves as a parent class for OpCode without any custom
46 def __init__(self, **kwargs):
47 """Constructor for BaseOpCode.
49 The constructor takes only keyword arguments and will set
50 attributes on this object based on the passed arguments. As such,
51 it means that you should not pass arguments which are not in the
52 __slots__ attribute for this class.
55 slots = self._all_slots()
58 raise TypeError("Object %s doesn't support the parameter '%s'" %
59 (self.__class__.__name__, key))
60 setattr(self, key, kwargs[key])
62 def __getstate__(self):
63 """Generic serializer.
65 This method just returns the contents of the instance as a
69 @return: the instance attributes and their values
73 for name in self._all_slots():
74 if hasattr(self, name):
75 state[name] = getattr(self, name)
78 def __setstate__(self, state):
79 """Generic unserializer.
81 This method just restores from the serialized state the attributes
82 of the current instance.
84 @param state: the serialized opcode data
88 if not isinstance(state, dict):
89 raise ValueError("Invalid data to __setstate__: expected dict, got %s" %
92 for name in self._all_slots():
93 if name not in state and hasattr(self, name):
97 setattr(self, name, state[name])
101 """Compute the list of all declared slots for a class.
105 for parent in cls.__mro__:
106 slots.extend(getattr(parent, "__slots__", []))
110 class OpCode(BaseOpCode):
113 This is the root of the actual OpCode hierarchy. All clases derived
114 from this class should override OP_ID.
116 @cvar OP_ID: The ID of this opcode. This should be unique amongst all
117 children of this class.
118 @ivar dry_run: Whether the LU should be run in dry-run mode, i.e. just
122 OP_ID = "OP_ABSTRACT"
123 __slots__ = ["dry_run", "debug_level"]
125 def __getstate__(self):
126 """Specialized getstate for opcodes.
128 This method adds to the state dictionary the OP_ID of the class,
129 so that on unload we can identify the correct class for
130 instantiating the opcode.
133 @return: the state as a dictionary
136 data = BaseOpCode.__getstate__(self)
137 data["OP_ID"] = self.OP_ID
141 def LoadOpCode(cls, data):
142 """Generic load opcode method.
144 The method identifies the correct opcode class from the dict-form
145 by looking for a OP_ID key, if this is not found, or its value is
146 not available in this module as a child of this class, we fail.
149 @param data: the serialized opcode
152 if not isinstance(data, dict):
153 raise ValueError("Invalid data to LoadOpCode (%s)" % type(data))
154 if "OP_ID" not in data:
155 raise ValueError("Invalid data to LoadOpcode, missing OP_ID")
156 op_id = data["OP_ID"]
158 if op_id in OP_MAPPING:
159 op_class = OP_MAPPING[op_id]
161 raise ValueError("Invalid data to LoadOpCode: OP_ID %s unsupported" %
164 new_data = data.copy()
165 del new_data["OP_ID"]
166 op.__setstate__(new_data)
170 """Generates a summary description of this opcode.
173 # all OP_ID start with OP_, we remove that
175 field_name = getattr(self, "OP_DSC_FIELD", None)
177 field_value = getattr(self, field_name, None)
178 txt = "%s(%s)" % (txt, field_value)
184 class OpPostInitCluster(OpCode):
185 """Post cluster initialization.
187 This opcode does not touch the cluster at all. Its purpose is to run hooks
188 after the cluster has been initialized.
191 OP_ID = "OP_CLUSTER_POST_INIT"
195 class OpDestroyCluster(OpCode):
196 """Destroy the cluster.
198 This opcode has no other parameters. All the state is irreversibly
199 lost after the execution of this opcode.
202 OP_ID = "OP_CLUSTER_DESTROY"
206 class OpQueryClusterInfo(OpCode):
207 """Query cluster information."""
208 OP_ID = "OP_CLUSTER_QUERY"
212 class OpVerifyCluster(OpCode):
213 """Verify the cluster state.
215 @type skip_checks: C{list}
216 @ivar skip_checks: steps to be skipped from the verify process; this
217 needs to be a subset of
218 L{constants.VERIFY_OPTIONAL_CHECKS}; currently
219 only L{constants.VERIFY_NPLUSONE_MEM} can be passed
222 OP_ID = "OP_CLUSTER_VERIFY"
223 __slots__ = ["skip_checks", "verbose", "error_codes",
224 "debug_simulate_errors"]
227 class OpVerifyDisks(OpCode):
228 """Verify the cluster disks.
232 Result: a tuple of four elements:
233 - list of node names with bad data returned (unreachable, etc.)
234 - dict of node names with broken volume groups (values: error msg)
235 - list of instances with degraded disks (that should be activated)
236 - dict of instances with missing logical volumes (values: (node, vol)
237 pairs with details about the missing volumes)
239 In normal operation, all lists should be empty. A non-empty instance
240 list (3rd element of the result) is still ok (errors were fixed) but
241 non-empty node list means some node is down, and probably there are
242 unfixable drbd errors.
244 Note that only instances that are drbd-based are taken into
245 consideration. This might need to be revisited in the future.
248 OP_ID = "OP_CLUSTER_VERIFY_DISKS"
252 class OpRepairDiskSizes(OpCode):
253 """Verify the disk sizes of the instances and fixes configuration
256 Parameters: optional instances list, in case we want to restrict the
257 checks to only a subset of the instances.
259 Result: a list of tuples, (instance, disk, new-size) for changed
262 In normal operation, the list should be empty.
264 @type instances: list
265 @ivar instances: the list of instances to check, or empty for all instances
268 OP_ID = "OP_CLUSTER_REPAIR_DISK_SIZES"
269 __slots__ = ["instances"]
272 class OpQueryConfigValues(OpCode):
273 """Query cluster configuration values."""
274 OP_ID = "OP_CLUSTER_CONFIG_QUERY"
275 __slots__ = ["output_fields"]
278 class OpRenameCluster(OpCode):
279 """Rename the cluster.
282 @ivar name: The new name of the cluster. The name and/or the master IP
283 address will be changed to match the new name and its IP
287 OP_ID = "OP_CLUSTER_RENAME"
288 OP_DSC_FIELD = "name"
292 class OpSetClusterParams(OpCode):
293 """Change the parameters of the cluster.
295 @type vg_name: C{str} or C{None}
296 @ivar vg_name: The new volume group name or None to disable LVM usage.
299 OP_ID = "OP_CLUSTER_SET_PARAMS"
302 "enabled_hypervisors",
307 "candidate_pool_size",
308 "maintain_node_health",
315 class OpRedistributeConfig(OpCode):
316 """Force a full push of the cluster configuration.
319 OP_ID = "OP_CLUSTER_REDIST_CONF"
324 class OpRemoveNode(OpCode):
327 @type node_name: C{str}
328 @ivar node_name: The name of the node to remove. If the node still has
329 instances on it, the operation will fail.
332 OP_ID = "OP_NODE_REMOVE"
333 OP_DSC_FIELD = "node_name"
334 __slots__ = ["node_name"]
337 class OpAddNode(OpCode):
338 """Add a node to the cluster.
340 @type node_name: C{str}
341 @ivar node_name: The name of the node to add. This can be a short name,
342 but it will be expanded to the FQDN.
343 @type primary_ip: IP address
344 @ivar primary_ip: The primary IP of the node. This will be ignored when the
345 opcode is submitted, but will be filled during the node
346 add (so it will be visible in the job query).
347 @type secondary_ip: IP address
348 @ivar secondary_ip: The secondary IP of the node. This needs to be passed
349 if the cluster has been initialized in 'dual-network'
350 mode, otherwise it must not be given.
352 @ivar readd: Whether to re-add an existing node to the cluster. If
353 this is not passed, then the operation will abort if the node
354 name is already in the cluster; use this parameter to 'repair'
355 a node that had its configuration broken, or was reinstalled
356 without removal from the cluster.
359 OP_ID = "OP_NODE_ADD"
360 OP_DSC_FIELD = "node_name"
361 __slots__ = ["node_name", "primary_ip", "secondary_ip", "readd"]
364 class OpQueryNodes(OpCode):
365 """Compute the list of nodes."""
366 OP_ID = "OP_NODE_QUERY"
367 __slots__ = ["output_fields", "names", "use_locking"]
370 class OpQueryNodeVolumes(OpCode):
371 """Get list of volumes on node."""
372 OP_ID = "OP_NODE_QUERYVOLS"
373 __slots__ = ["nodes", "output_fields"]
376 class OpQueryNodeStorage(OpCode):
377 """Get information on storage for node(s)."""
378 OP_ID = "OP_NODE_QUERY_STORAGE"
387 class OpModifyNodeStorage(OpCode):
388 """Modifies the properies of a storage unit"""
389 OP_ID = "OP_NODE_MODIFY_STORAGE"
398 class OpRepairNodeStorage(OpCode):
399 """Repairs the volume group on a node."""
400 OP_ID = "OP_REPAIR_NODE_STORAGE"
401 OP_DSC_FIELD = "node_name"
406 "ignore_consistency",
410 class OpSetNodeParams(OpCode):
411 """Change the parameters of a node."""
412 OP_ID = "OP_NODE_SET_PARAMS"
413 OP_DSC_FIELD = "node_name"
424 class OpPowercycleNode(OpCode):
425 """Tries to powercycle a node."""
426 OP_ID = "OP_NODE_POWERCYCLE"
427 OP_DSC_FIELD = "node_name"
434 class OpEvacuateNode(OpCode):
435 """Relocate secondary instances from a node."""
436 OP_ID = "OP_NODE_EVACUATE"
437 OP_DSC_FIELD = "node_name"
439 "node_name", "remote_node", "iallocator", "early_release",
443 class OpMigrateNode(OpCode):
444 """Migrate all instances from a node."""
445 OP_ID = "OP_NODE_MIGRATE"
446 OP_DSC_FIELD = "node_name"
453 class OpNodeEvacuationStrategy(OpCode):
454 """Compute the evacuation strategy for a list of nodes."""
455 OP_ID = "OP_NODE_EVAC_STRATEGY"
456 OP_DSC_FIELD = "nodes"
457 __slots__ = ["nodes", "iallocator", "remote_node"]
462 class OpCreateInstance(OpCode):
463 """Create an instance."""
464 OP_ID = "OP_INSTANCE_CREATE"
465 OP_DSC_FIELD = "instance_name"
468 "os_type", "force_variant", "no_install",
469 "pnode", "disk_template", "snode", "mode",
471 "src_node", "src_path", "start", "identify_defaults",
472 "wait_for_sync", "ip_check", "name_check",
473 "file_storage_dir", "file_driver",
475 "hypervisor", "hvparams", "beparams",
480 class OpReinstallInstance(OpCode):
481 """Reinstall an instance's OS."""
482 OP_ID = "OP_INSTANCE_REINSTALL"
483 OP_DSC_FIELD = "instance_name"
484 __slots__ = ["instance_name", "os_type", "force_variant"]
487 class OpRemoveInstance(OpCode):
488 """Remove an instance."""
489 OP_ID = "OP_INSTANCE_REMOVE"
490 OP_DSC_FIELD = "instance_name"
498 class OpRenameInstance(OpCode):
499 """Rename an instance."""
500 OP_ID = "OP_INSTANCE_RENAME"
502 "instance_name", "ignore_ip", "new_name",
506 class OpStartupInstance(OpCode):
507 """Startup an instance."""
508 OP_ID = "OP_INSTANCE_STARTUP"
509 OP_DSC_FIELD = "instance_name"
511 "instance_name", "force", "hvparams", "beparams",
515 class OpShutdownInstance(OpCode):
516 """Shutdown an instance."""
517 OP_ID = "OP_INSTANCE_SHUTDOWN"
518 OP_DSC_FIELD = "instance_name"
519 __slots__ = ["instance_name", "timeout"]
522 class OpRebootInstance(OpCode):
523 """Reboot an instance."""
524 OP_ID = "OP_INSTANCE_REBOOT"
525 OP_DSC_FIELD = "instance_name"
527 "instance_name", "reboot_type", "ignore_secondaries", "shutdown_timeout",
531 class OpReplaceDisks(OpCode):
532 """Replace the disks of an instance."""
533 OP_ID = "OP_INSTANCE_REPLACE_DISKS"
534 OP_DSC_FIELD = "instance_name"
536 "instance_name", "remote_node", "mode", "disks", "iallocator",
541 class OpFailoverInstance(OpCode):
542 """Failover an instance."""
543 OP_ID = "OP_INSTANCE_FAILOVER"
544 OP_DSC_FIELD = "instance_name"
546 "instance_name", "ignore_consistency", "shutdown_timeout",
550 class OpMigrateInstance(OpCode):
551 """Migrate an instance.
553 This migrates (without shutting down an instance) to its secondary
556 @ivar instance_name: the name of the instance
559 OP_ID = "OP_INSTANCE_MIGRATE"
560 OP_DSC_FIELD = "instance_name"
561 __slots__ = ["instance_name", "live", "cleanup"]
564 class OpMoveInstance(OpCode):
567 This move (with shutting down an instance and data copying) to an
570 @ivar instance_name: the name of the instance
571 @ivar target_node: the destination node
574 OP_ID = "OP_INSTANCE_MOVE"
575 OP_DSC_FIELD = "instance_name"
577 "instance_name", "target_node", "shutdown_timeout",
581 class OpConnectConsole(OpCode):
582 """Connect to an instance's console."""
583 OP_ID = "OP_INSTANCE_CONSOLE"
584 OP_DSC_FIELD = "instance_name"
585 __slots__ = ["instance_name"]
588 class OpActivateInstanceDisks(OpCode):
589 """Activate an instance's disks."""
590 OP_ID = "OP_INSTANCE_ACTIVATE_DISKS"
591 OP_DSC_FIELD = "instance_name"
592 __slots__ = ["instance_name", "ignore_size"]
595 class OpDeactivateInstanceDisks(OpCode):
596 """Deactivate an instance's disks."""
597 OP_ID = "OP_INSTANCE_DEACTIVATE_DISKS"
598 OP_DSC_FIELD = "instance_name"
599 __slots__ = ["instance_name"]
602 class OpRecreateInstanceDisks(OpCode):
603 """Deactivate an instance's disks."""
604 OP_ID = "OP_INSTANCE_RECREATE_DISKS"
605 OP_DSC_FIELD = "instance_name"
606 __slots__ = ["instance_name", "disks"]
609 class OpQueryInstances(OpCode):
610 """Compute the list of instances."""
611 OP_ID = "OP_INSTANCE_QUERY"
612 __slots__ = ["output_fields", "names", "use_locking"]
615 class OpQueryInstanceData(OpCode):
616 """Compute the run-time status of instances."""
617 OP_ID = "OP_INSTANCE_QUERY_DATA"
618 __slots__ = ["instances", "static"]
621 class OpSetInstanceParams(OpCode):
622 """Change the parameters of an instance."""
623 OP_ID = "OP_INSTANCE_SET_PARAMS"
624 OP_DSC_FIELD = "instance_name"
627 "hvparams", "beparams", "force",
628 "nics", "disks", "disk_template",
629 "remote_node", "os_name", "force_variant",
633 class OpGrowDisk(OpCode):
634 """Grow a disk of an instance."""
635 OP_ID = "OP_INSTANCE_GROW_DISK"
636 OP_DSC_FIELD = "instance_name"
638 "instance_name", "disk", "amount", "wait_for_sync",
643 class OpDiagnoseOS(OpCode):
644 """Compute the list of guest operating systems."""
645 OP_ID = "OP_OS_DIAGNOSE"
646 __slots__ = ["output_fields", "names"]
650 class OpQueryExports(OpCode):
651 """Compute the list of exported images."""
652 OP_ID = "OP_BACKUP_QUERY"
653 __slots__ = ["nodes", "use_locking"]
656 class OpExportInstance(OpCode):
657 """Export an instance."""
658 OP_ID = "OP_BACKUP_EXPORT"
659 OP_DSC_FIELD = "instance_name"
661 "instance_name", "target_node", "shutdown", "shutdown_timeout",
665 class OpRemoveExport(OpCode):
666 """Remove an instance's export."""
667 OP_ID = "OP_BACKUP_REMOVE"
668 OP_DSC_FIELD = "instance_name"
669 __slots__ = ["instance_name"]
673 class OpGetTags(OpCode):
674 """Returns the tags of the given object."""
675 OP_ID = "OP_TAGS_GET"
676 OP_DSC_FIELD = "name"
677 __slots__ = ["kind", "name"]
680 class OpSearchTags(OpCode):
681 """Searches the tags in the cluster for a given pattern."""
682 OP_ID = "OP_TAGS_SEARCH"
683 OP_DSC_FIELD = "pattern"
684 __slots__ = ["pattern"]
687 class OpAddTags(OpCode):
688 """Add a list of tags on a given object."""
689 OP_ID = "OP_TAGS_SET"
690 __slots__ = ["kind", "name", "tags"]
693 class OpDelTags(OpCode):
694 """Remove a list of tags from a given object."""
695 OP_ID = "OP_TAGS_DEL"
696 __slots__ = ["kind", "name", "tags"]
700 class OpTestDelay(OpCode):
701 """Sleeps for a configured amount of time.
703 This is used just for debugging and testing.
706 - duration: the time to sleep
707 - on_master: if true, sleep on the master
708 - on_nodes: list of nodes in which to sleep
710 If the on_master parameter is true, it will execute a sleep on the
711 master (before any node sleep).
713 If the on_nodes list is not empty, it will sleep on those nodes
714 (after the sleep on the master, if that is enabled).
716 As an additional feature, the case of duration < 0 will be reported
717 as an execution error, so this opcode can be used as a failure
718 generator. The case of duration == 0 will not be treated specially.
721 OP_ID = "OP_TEST_DELAY"
722 OP_DSC_FIELD = "duration"
723 __slots__ = ["duration", "on_master", "on_nodes"]
726 class OpTestAllocator(OpCode):
727 """Allocator framework testing.
729 This opcode has two modes:
730 - gather and return allocator input for a given mode (allocate new
731 or replace secondary) and a given instance definition (direction
733 - run a selected allocator for a given operation (as above) and
734 return the allocator output (direction 'out')
737 OP_ID = "OP_TEST_ALLOCATOR"
738 OP_DSC_FIELD = "allocator"
740 "direction", "mode", "allocator", "name",
741 "mem_size", "disks", "disk_template",
742 "os", "tags", "nics", "vcpus", "hypervisor",
747 OP_MAPPING = dict([(v.OP_ID, v) for v in globals().values()
748 if (isinstance(v, type) and issubclass(v, OpCode) and
749 hasattr(v, "OP_ID"))])