4 # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 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 """Utility function mainly, but not only used by instance LU's."""
27 from ganeti import constants
28 from ganeti import errors
29 from ganeti import locking
30 from ganeti import network
31 from ganeti import objects
32 from ganeti import pathutils
33 from ganeti import utils
34 from ganeti.cmdlib.common import AnnotateDiskParams, \
35 ComputeIPolicyInstanceViolation, CheckDiskTemplateEnabled
38 def BuildInstanceHookEnv(name, primary_node_name, secondary_node_names, os_type,
39 status, minmem, maxmem, vcpus, nics, disk_template,
40 disks, bep, hvp, hypervisor_name, tags):
41 """Builds instance related env variables for hooks
43 This builds the hook environment from individual variables.
46 @param name: the name of the instance
47 @type primary_node_name: string
48 @param primary_node_name: the name of the instance's primary node
49 @type secondary_node_names: list
50 @param secondary_node_names: list of secondary nodes as strings
52 @param os_type: the name of the instance's OS
54 @param status: the desired status of the instance
56 @param minmem: the minimum memory size of the instance
58 @param maxmem: the maximum memory size of the instance
60 @param vcpus: the count of VCPUs the instance has
62 @param nics: list of tuples (name, uuid, ip, mac, mode, link, net, netinfo)
63 representing the NICs the instance has
64 @type disk_template: string
65 @param disk_template: the disk template of the instance
67 @param disks: list of tuples (name, uuid, size, mode)
69 @param bep: the backend parameters for the instance
71 @param hvp: the hypervisor parameters for the instance
72 @type hypervisor_name: string
73 @param hypervisor_name: the hypervisor for the instance
75 @param tags: list of instance tags as strings
77 @return: the hook environment for this instance
82 "INSTANCE_NAME": name,
83 "INSTANCE_PRIMARY": primary_node_name,
84 "INSTANCE_SECONDARIES": " ".join(secondary_node_names),
85 "INSTANCE_OS_TYPE": os_type,
86 "INSTANCE_STATUS": status,
87 "INSTANCE_MINMEM": minmem,
88 "INSTANCE_MAXMEM": maxmem,
89 # TODO(2.9) remove deprecated "memory" value
90 "INSTANCE_MEMORY": maxmem,
91 "INSTANCE_VCPUS": vcpus,
92 "INSTANCE_DISK_TEMPLATE": disk_template,
93 "INSTANCE_HYPERVISOR": hypervisor_name,
97 for idx, (name, uuid, ip, mac, mode, link, net, netinfo) in enumerate(nics):
101 env["INSTANCE_NIC%d_NAME" % idx] = name
102 env["INSTANCE_NIC%d_UUID" % idx] = uuid
103 env["INSTANCE_NIC%d_IP" % idx] = ip
104 env["INSTANCE_NIC%d_MAC" % idx] = mac
105 env["INSTANCE_NIC%d_MODE" % idx] = mode
106 env["INSTANCE_NIC%d_LINK" % idx] = link
108 nobj = objects.Network.FromDict(netinfo)
109 env.update(nobj.HooksDict("INSTANCE_NIC%d_" % idx))
111 # FIXME: broken network reference: the instance NIC specifies a
112 # network, but the relevant network entry was not in the config. This
113 # should be made impossible.
114 env["INSTANCE_NIC%d_NETWORK_NAME" % idx] = net
115 if mode == constants.NIC_MODE_BRIDGED:
116 env["INSTANCE_NIC%d_BRIDGE" % idx] = link
120 env["INSTANCE_NIC_COUNT"] = nic_count
123 disk_count = len(disks)
124 for idx, (name, uuid, size, mode) in enumerate(disks):
126 env["INSTANCE_DISK%d_NAME" % idx] = name
127 env["INSTANCE_DISK%d_UUID" % idx] = uuid
128 env["INSTANCE_DISK%d_SIZE" % idx] = size
129 env["INSTANCE_DISK%d_MODE" % idx] = mode
133 env["INSTANCE_DISK_COUNT"] = disk_count
138 env["INSTANCE_TAGS"] = " ".join(tags)
140 for source, kind in [(bep, "BE"), (hvp, "HV")]:
141 for key, value in source.items():
142 env["INSTANCE_%s_%s" % (kind, key)] = value
147 def BuildInstanceHookEnvByObject(lu, instance, override=None):
148 """Builds instance related env variables for hooks from an object.
150 @type lu: L{LogicalUnit}
151 @param lu: the logical unit on whose behalf we execute
152 @type instance: L{objects.Instance}
153 @param instance: the instance for which we should build the
156 @param override: dictionary with key/values that will override
159 @return: the hook environment dictionary
162 cluster = lu.cfg.GetClusterInfo()
163 bep = cluster.FillBE(instance)
164 hvp = cluster.FillHV(instance)
166 "name": instance.name,
167 "primary_node_name": lu.cfg.GetNodeName(instance.primary_node),
168 "secondary_node_names": lu.cfg.GetNodeNames(instance.secondary_nodes),
169 "os_type": instance.os,
170 "status": instance.admin_state,
171 "maxmem": bep[constants.BE_MAXMEM],
172 "minmem": bep[constants.BE_MINMEM],
173 "vcpus": bep[constants.BE_VCPUS],
174 "nics": NICListToTuple(lu, instance.nics),
175 "disk_template": instance.disk_template,
176 "disks": [(disk.name, disk.uuid, disk.size, disk.mode)
177 for disk in instance.disks],
180 "hypervisor_name": instance.hypervisor,
181 "tags": instance.tags,
184 args.update(override)
185 return BuildInstanceHookEnv(**args) # pylint: disable=W0142
188 def GetClusterDomainSecret():
189 """Reads the cluster domain secret.
192 return utils.ReadOneLineFile(pathutils.CLUSTER_DOMAIN_SECRET_FILE,
196 def CheckNodeNotDrained(lu, node_uuid):
197 """Ensure that a given node is not drained.
199 @param lu: the LU on behalf of which we make the check
200 @param node_uuid: the node to check
201 @raise errors.OpPrereqError: if the node is drained
204 node = lu.cfg.GetNodeInfo(node_uuid)
206 raise errors.OpPrereqError("Can't use drained node %s" % node.name,
210 def CheckNodeVmCapable(lu, node_uuid):
211 """Ensure that a given node is vm capable.
213 @param lu: the LU on behalf of which we make the check
214 @param node_uuid: the node to check
215 @raise errors.OpPrereqError: if the node is not vm capable
218 if not lu.cfg.GetNodeInfo(node_uuid).vm_capable:
219 raise errors.OpPrereqError("Can't use non-vm_capable node %s" % node_uuid,
223 def RemoveInstance(lu, feedback_fn, instance, ignore_failures):
224 """Utility function to remove an instance.
227 logging.info("Removing block devices for instance %s", instance.name)
229 if not RemoveDisks(lu, instance, ignore_failures=ignore_failures):
230 if not ignore_failures:
231 raise errors.OpExecError("Can't remove instance's disks")
232 feedback_fn("Warning: can't remove instance's disks")
234 logging.info("Removing instance %s out of cluster config", instance.name)
236 lu.cfg.RemoveInstance(instance.uuid)
238 assert not lu.remove_locks.get(locking.LEVEL_INSTANCE), \
239 "Instance lock removal conflict"
241 # Remove lock for the instance
242 lu.remove_locks[locking.LEVEL_INSTANCE] = instance.name
245 def RemoveDisks(lu, instance, target_node_uuid=None, ignore_failures=False):
246 """Remove all disks for an instance.
248 This abstracts away some work from `AddInstance()` and
249 `RemoveInstance()`. Note that in case some of the devices couldn't
250 be removed, the removal will continue with the other ones.
252 @type lu: L{LogicalUnit}
253 @param lu: the logical unit on whose behalf we execute
254 @type instance: L{objects.Instance}
255 @param instance: the instance whose disks we should remove
256 @type target_node_uuid: string
257 @param target_node_uuid: used to override the node on which to remove the
260 @return: the success of the removal
263 logging.info("Removing block devices for instance %s", instance.name)
266 ports_to_release = set()
267 anno_disks = AnnotateDiskParams(instance, instance.disks, lu.cfg)
268 for (idx, device) in enumerate(anno_disks):
270 edata = [(target_node_uuid, device)]
272 edata = device.ComputeNodeTree(instance.primary_node)
273 for node_uuid, disk in edata:
274 lu.cfg.SetDiskID(disk, node_uuid)
275 result = lu.rpc.call_blockdev_remove(node_uuid, disk)
277 lu.LogWarning("Could not remove disk %s on node %s,"
278 " continuing anyway: %s", idx,
279 lu.cfg.GetNodeName(node_uuid), result.fail_msg)
280 if not (result.offline and node_uuid != instance.primary_node):
283 # if this is a DRBD disk, return its port to the pool
284 if device.dev_type in constants.DTS_DRBD:
285 ports_to_release.add(device.logical_id[2])
287 if all_result or ignore_failures:
288 for port in ports_to_release:
289 lu.cfg.AddTcpUdpPort(port)
291 CheckDiskTemplateEnabled(lu.cfg.GetClusterInfo(), instance.disk_template)
293 if instance.disk_template in constants.DTS_FILEBASED:
294 file_storage_dir = os.path.dirname(instance.disks[0].logical_id[1])
296 tgt = target_node_uuid
298 tgt = instance.primary_node
299 result = lu.rpc.call_file_storage_dir_remove(tgt, file_storage_dir)
301 lu.LogWarning("Could not remove directory '%s' on node %s: %s",
302 file_storage_dir, lu.cfg.GetNodeName(tgt), result.fail_msg)
308 def NICToTuple(lu, nic):
309 """Build a tupple of nic information.
311 @type lu: L{LogicalUnit}
312 @param lu: the logical unit on whose behalf we execute
313 @type nic: L{objects.NIC}
314 @param nic: nic to convert to hooks tuple
317 cluster = lu.cfg.GetClusterInfo()
318 filled_params = cluster.SimpleFillNIC(nic.nicparams)
319 mode = filled_params[constants.NIC_MODE]
320 link = filled_params[constants.NIC_LINK]
323 nobj = lu.cfg.GetNetwork(nic.network)
324 netinfo = objects.Network.ToDict(nobj)
325 return (nic.name, nic.uuid, nic.ip, nic.mac, mode, link, nic.network, netinfo)
328 def NICListToTuple(lu, nics):
329 """Build a list of nic information tuples.
331 This list is suitable to be passed to _BuildInstanceHookEnv or as a return
332 value in LUInstanceQueryData.
334 @type lu: L{LogicalUnit}
335 @param lu: the logical unit on whose behalf we execute
336 @type nics: list of L{objects.NIC}
337 @param nics: list of nics to convert to hooks tuples
342 hooks_nics.append(NICToTuple(lu, nic))
346 def CopyLockList(names):
347 """Makes a copy of a list of lock names.
349 Handles L{locking.ALL_SET} correctly.
352 if names == locking.ALL_SET:
353 return locking.ALL_SET
358 def ReleaseLocks(lu, level, names=None, keep=None):
359 """Releases locks owned by an LU.
361 @type lu: L{LogicalUnit}
362 @param level: Lock level
363 @type names: list or None
364 @param names: Names of locks to release
365 @type keep: list or None
366 @param keep: Names of locks to retain
369 assert not (keep is not None and names is not None), \
370 "Only one of the 'names' and the 'keep' parameters can be given"
372 if names is not None:
373 should_release = names.__contains__
375 should_release = lambda name: name not in keep
377 should_release = None
379 owned = lu.owned_locks(level)
381 # Not owning any lock at this level, do nothing
388 # Determine which locks to release
390 if should_release(name):
395 assert len(lu.owned_locks(level)) == (len(retain) + len(release))
397 # Release just some locks
398 lu.glm.release(level, names=release)
400 assert frozenset(lu.owned_locks(level)) == frozenset(retain)
403 lu.glm.release(level)
405 assert not lu.glm.is_owned(level), "No locks should be owned"
408 def _ComputeIPolicyNodeViolation(ipolicy, instance, current_group,
410 _compute_fn=ComputeIPolicyInstanceViolation):
411 """Compute if instance meets the specs of the new target group.
413 @param ipolicy: The ipolicy to verify
414 @param instance: The instance object to verify
415 @param current_group: The current group of the instance
416 @param target_group: The new group of the instance
417 @type cfg: L{config.ConfigWriter}
418 @param cfg: Cluster configuration
419 @param _compute_fn: The function to verify ipolicy (unittest only)
420 @see: L{ganeti.cmdlib.common.ComputeIPolicySpecViolation}
423 if current_group == target_group:
426 return _compute_fn(ipolicy, instance, cfg)
429 def CheckTargetNodeIPolicy(lu, ipolicy, instance, node, cfg, ignore=False,
430 _compute_fn=_ComputeIPolicyNodeViolation):
431 """Checks that the target node is correct in terms of instance policy.
433 @param ipolicy: The ipolicy to verify
434 @param instance: The instance object to verify
435 @param node: The new node to relocate
436 @type cfg: L{config.ConfigWriter}
437 @param cfg: Cluster configuration
438 @param ignore: Ignore violations of the ipolicy
439 @param _compute_fn: The function to verify ipolicy (unittest only)
440 @see: L{ganeti.cmdlib.common.ComputeIPolicySpecViolation}
443 primary_node = lu.cfg.GetNodeInfo(instance.primary_node)
444 res = _compute_fn(ipolicy, instance, primary_node.group, node.group, cfg)
447 msg = ("Instance does not meet target node group's (%s) instance"
448 " policy: %s") % (node.group, utils.CommaJoin(res))
452 raise errors.OpPrereqError(msg, errors.ECODE_INVAL)
455 def GetInstanceInfoText(instance):
456 """Compute that text that should be added to the disk's metadata.
459 return "originstname+%s" % instance.name
462 def CheckNodeFreeMemory(lu, node_uuid, reason, requested, hvname, hvparams):
463 """Checks if a node has enough free memory.
465 This function checks if a given node has the needed amount of free
466 memory. In case the node has less memory or we cannot get the
467 information from the node, this function raises an OpPrereqError
470 @type lu: C{LogicalUnit}
471 @param lu: a logical unit from which we get configuration data
472 @type node_uuid: C{str}
473 @param node_uuid: the node to check
475 @param reason: string to use in the error message
476 @type requested: C{int}
477 @param requested: the amount of memory in MiB to check for
479 @param hvname: the hypervisor's name
480 @type hvparams: dict of strings
481 @param hvparams: the hypervisor's parameters
483 @return: node current free memory
484 @raise errors.OpPrereqError: if the node doesn't have enough memory, or
485 we cannot check the node
488 node_name = lu.cfg.GetNodeName(node_uuid)
489 nodeinfo = lu.rpc.call_node_info([node_uuid], None, [(hvname, hvparams)])
490 nodeinfo[node_uuid].Raise("Can't get data from node %s" % node_name,
491 prereq=True, ecode=errors.ECODE_ENVIRON)
492 (_, _, (hv_info, )) = nodeinfo[node_uuid].payload
494 free_mem = hv_info.get("memory_free", None)
495 if not isinstance(free_mem, int):
496 raise errors.OpPrereqError("Can't compute free memory on node %s, result"
497 " was '%s'" % (node_name, free_mem),
498 errors.ECODE_ENVIRON)
499 if requested > free_mem:
500 raise errors.OpPrereqError("Not enough memory on node %s for %s:"
501 " needed %s MiB, available %s MiB" %
502 (node_name, reason, requested, free_mem),
507 def CheckInstanceBridgesExist(lu, instance, node_uuid=None):
508 """Check that the brigdes needed by an instance exist.
511 if node_uuid is None:
512 node_uuid = instance.primary_node
513 CheckNicsBridgesExist(lu, instance.nics, node_uuid)
516 def CheckNicsBridgesExist(lu, nics, node_uuid):
517 """Check that the brigdes needed by a list of nics exist.
520 cluster = lu.cfg.GetClusterInfo()
521 paramslist = [cluster.SimpleFillNIC(nic.nicparams) for nic in nics]
522 brlist = [params[constants.NIC_LINK] for params in paramslist
523 if params[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED]
525 result = lu.rpc.call_bridges_exist(node_uuid, brlist)
526 result.Raise("Error checking bridges on destination node '%s'" %
527 lu.cfg.GetNodeName(node_uuid), prereq=True,
528 ecode=errors.ECODE_ENVIRON)
531 def CheckNodeHasOS(lu, node_uuid, os_name, force_variant):
532 """Ensure that a node supports a given OS.
534 @param lu: the LU on behalf of which we make the check
535 @param node_uuid: the node to check
536 @param os_name: the OS to query about
537 @param force_variant: whether to ignore variant errors
538 @raise errors.OpPrereqError: if the node is not supporting the OS
541 result = lu.rpc.call_os_get(node_uuid, os_name)
542 result.Raise("OS '%s' not in supported OS list for node %s" %
543 (os_name, lu.cfg.GetNodeName(node_uuid)),
544 prereq=True, ecode=errors.ECODE_INVAL)
545 if not force_variant:
546 _CheckOSVariant(result.payload, os_name)
549 def _CheckOSVariant(os_obj, name):
550 """Check whether an OS name conforms to the os variants specification.
552 @type os_obj: L{objects.OS}
553 @param os_obj: OS object to check
555 @param name: OS name passed by the user, to check for validity
558 variant = objects.OS.GetVariant(name)
559 if not os_obj.supported_variants:
561 raise errors.OpPrereqError("OS '%s' doesn't support variants ('%s'"
562 " passed)" % (os_obj.name, variant),
566 raise errors.OpPrereqError("OS name must include a variant",
569 if variant not in os_obj.supported_variants:
570 raise errors.OpPrereqError("Unsupported OS variant", errors.ECODE_INVAL)