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 """Functions used by the node daemon"""
39 from ganeti import errors
40 from ganeti import utils
41 from ganeti import ssh
42 from ganeti import hypervisor
43 from ganeti import constants
44 from ganeti import bdev
45 from ganeti import objects
46 from ganeti import ssconf
50 """Simple wrapper to return a SimpleStore.
52 @rtype: L{ssconf.SimpleStore}
53 @return: a SimpleStore instance
56 return ssconf.SimpleStore()
59 def _GetSshRunner(cluster_name):
60 """Simple wrapper to return an SshRunner.
62 @type cluster_name: str
63 @param cluster_name: the cluster name, which is needed
64 by the SshRunner constructor
65 @rtype: L{ssh.SshRunner}
66 @return: an SshRunner instance
69 return ssh.SshRunner(cluster_name)
72 def _Decompress(data):
73 """Unpacks data compressed by the RPC client.
75 @type data: list or tuple
76 @param data: Data sent by RPC client
78 @return: Decompressed data
81 assert isinstance(data, (list, tuple))
83 (encoding, content) = data
84 if encoding == constants.RPC_ENCODING_NONE:
86 elif encoding == constants.RPC_ENCODING_ZLIB_BASE64:
87 return zlib.decompress(base64.b64decode(content))
89 raise AssertionError("Unknown data encoding")
92 def _CleanDirectory(path, exclude=None):
93 """Removes all regular files in a directory.
96 @param path: the directory to clean
98 @param exclude: list of files to be excluded, defaults
102 if not os.path.isdir(path):
107 # Normalize excluded paths
108 exclude = [os.path.normpath(i) for i in exclude]
110 for rel_name in utils.ListVisibleFiles(path):
111 full_name = os.path.normpath(os.path.join(path, rel_name))
112 if full_name in exclude:
114 if os.path.isfile(full_name) and not os.path.islink(full_name):
115 utils.RemoveFile(full_name)
119 """Removes job queue files and archived jobs.
124 _CleanDirectory(constants.QUEUE_DIR, exclude=[constants.JOB_QUEUE_LOCK_FILE])
125 _CleanDirectory(constants.JOB_QUEUE_ARCHIVE_DIR)
129 """Returns master information.
131 This is an utility function to compute master information, either
132 for consumption here or from the node daemon.
135 @return: (master_netdev, master_ip, master_name) if we have a good
136 configuration, otherwise (None, None, None)
141 master_netdev = cfg.GetMasterNetdev()
142 master_ip = cfg.GetMasterIP()
143 master_node = cfg.GetMasterNode()
144 except errors.ConfigurationError, err:
145 logging.exception("Cluster configuration incomplete")
146 return (None, None, None)
147 return (master_netdev, master_ip, master_node)
150 def StartMaster(start_daemons):
151 """Activate local node as master node.
153 The function will always try activate the IP address of the master
154 (unless someone else has it). It will also start the master daemons,
155 based on the start_daemons parameter.
157 @type start_daemons: boolean
158 @param start_daemons: whther to also start the master
159 daemons (ganeti-masterd and ganeti-rapi)
164 master_netdev, master_ip, _ = GetMasterInfo()
165 if not master_netdev:
168 if utils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
169 if utils.OwnIpAddress(master_ip):
170 # we already have the ip:
171 logging.debug("Already started")
173 logging.error("Someone else has the master ip, not activating")
176 result = utils.RunCmd(["ip", "address", "add", "%s/32" % master_ip,
177 "dev", master_netdev, "label",
178 "%s:0" % master_netdev])
180 logging.error("Can't activate master IP: %s", result.output)
183 result = utils.RunCmd(["arping", "-q", "-U", "-c 3", "-I", master_netdev,
184 "-s", master_ip, master_ip])
185 # we'll ignore the exit code of arping
187 # and now start the master and rapi daemons
189 for daemon in 'ganeti-masterd', 'ganeti-rapi':
190 result = utils.RunCmd([daemon])
192 logging.error("Can't start daemon %s: %s", daemon, result.output)
197 def StopMaster(stop_daemons):
198 """Deactivate this node as master.
200 The function will always try to deactivate the IP address of the
201 master. It will also stop the master daemons depending on the
202 stop_daemons parameter.
204 @type stop_daemons: boolean
205 @param stop_daemons: whether to also stop the master daemons
206 (ganeti-masterd and ganeti-rapi)
210 master_netdev, master_ip, _ = GetMasterInfo()
211 if not master_netdev:
214 result = utils.RunCmd(["ip", "address", "del", "%s/32" % master_ip,
215 "dev", master_netdev])
217 logging.error("Can't remove the master IP, error: %s", result.output)
218 # but otherwise ignore the failure
221 # stop/kill the rapi and the master daemon
222 for daemon in constants.RAPI_PID, constants.MASTERD_PID:
223 utils.KillProcess(utils.ReadPidFile(utils.DaemonPidFileName(daemon)))
228 def AddNode(dsa, dsapub, rsa, rsapub, sshkey, sshpub):
229 """Joins this node to the cluster.
231 This does the following:
232 - updates the hostkeys of the machine (rsa and dsa)
233 - adds the ssh private key to the user
234 - adds the ssh public key to the users' authorized_keys file
237 @param dsa: the DSA private key to write
239 @param dsapub: the DSA public key to write
241 @param rsa: the RSA private key to write
243 @param rsapub: the RSA public key to write
245 @param sshkey: the SSH private key to write
247 @param sshpub: the SSH public key to write
249 @return: the success of the operation
252 sshd_keys = [(constants.SSH_HOST_RSA_PRIV, rsa, 0600),
253 (constants.SSH_HOST_RSA_PUB, rsapub, 0644),
254 (constants.SSH_HOST_DSA_PRIV, dsa, 0600),
255 (constants.SSH_HOST_DSA_PUB, dsapub, 0644)]
256 for name, content, mode in sshd_keys:
257 utils.WriteFile(name, data=content, mode=mode)
260 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS,
262 except errors.OpExecError, err:
263 msg = "Error while processing user ssh files"
264 logging.exception(msg)
265 return (False, "%s: %s" % (msg, err))
267 for name, content in [(priv_key, sshkey), (pub_key, sshpub)]:
268 utils.WriteFile(name, data=content, mode=0600)
270 utils.AddAuthorizedKey(auth_keys, sshpub)
272 utils.RunCmd([constants.SSH_INITD_SCRIPT, "restart"])
274 return (True, "Node added successfully")
278 """Cleans up and remove the current node.
280 This function cleans up and prepares the current node to be removed
283 If processing is successful, then it raises an
284 L{errors.QuitGanetiException} which is used as a special case to
285 shutdown the node daemon.
288 _CleanDirectory(constants.DATA_DIR)
292 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
293 except errors.OpExecError:
294 logging.exception("Error while processing ssh files")
297 f = open(pub_key, 'r')
299 utils.RemoveAuthorizedKey(auth_keys, f.read(8192))
303 utils.RemoveFile(priv_key)
304 utils.RemoveFile(pub_key)
306 # Return a reassuring string to the caller, and quit
307 raise errors.QuitGanetiException(False, 'Shutdown scheduled')
310 def GetNodeInfo(vgname, hypervisor_type):
311 """Gives back a hash with different informations about the node.
313 @type vgname: C{string}
314 @param vgname: the name of the volume group to ask for disk space information
315 @type hypervisor_type: C{str}
316 @param hypervisor_type: the name of the hypervisor to ask for
319 @return: dictionary with the following keys:
320 - vg_size is the size of the configured volume group in MiB
321 - vg_free is the free size of the volume group in MiB
322 - memory_dom0 is the memory allocated for domain0 in MiB
323 - memory_free is the currently available (free) ram in MiB
324 - memory_total is the total number of ram in MiB
328 vginfo = _GetVGInfo(vgname)
329 outputarray['vg_size'] = vginfo['vg_size']
330 outputarray['vg_free'] = vginfo['vg_free']
332 hyper = hypervisor.GetHypervisor(hypervisor_type)
333 hyp_info = hyper.GetNodeInfo()
334 if hyp_info is not None:
335 outputarray.update(hyp_info)
337 f = open("/proc/sys/kernel/random/boot_id", 'r')
339 outputarray["bootid"] = f.read(128).rstrip("\n")
346 def VerifyNode(what, cluster_name):
347 """Verify the status of the local node.
349 Based on the input L{what} parameter, various checks are done on the
352 If the I{filelist} key is present, this list of
353 files is checksummed and the file/checksum pairs are returned.
355 If the I{nodelist} key is present, we check that we have
356 connectivity via ssh with the target nodes (and check the hostname
359 If the I{node-net-test} key is present, we check that we have
360 connectivity to the given nodes via both primary IP and, if
361 applicable, secondary IPs.
364 @param what: a dictionary of things to check:
365 - filelist: list of files for which to compute checksums
366 - nodelist: list of nodes we should check ssh communication with
367 - node-net-test: list of nodes we should check node daemon port
369 - hypervisor: list with hypervisors to run the verify for
371 @return: a dictionary with the same keys as the input dict, and
372 values representing the result of the checks
377 if constants.NV_HYPERVISOR in what:
378 result[constants.NV_HYPERVISOR] = tmp = {}
379 for hv_name in what[constants.NV_HYPERVISOR]:
380 tmp[hv_name] = hypervisor.GetHypervisor(hv_name).Verify()
382 if constants.NV_FILELIST in what:
383 result[constants.NV_FILELIST] = utils.FingerprintFiles(
384 what[constants.NV_FILELIST])
386 if constants.NV_NODELIST in what:
387 result[constants.NV_NODELIST] = tmp = {}
388 random.shuffle(what[constants.NV_NODELIST])
389 for node in what[constants.NV_NODELIST]:
390 success, message = _GetSshRunner(cluster_name).VerifyNodeHostname(node)
394 if constants.NV_NODENETTEST in what:
395 result[constants.NV_NODENETTEST] = tmp = {}
396 my_name = utils.HostInfo().name
397 my_pip = my_sip = None
398 for name, pip, sip in what[constants.NV_NODENETTEST]:
404 tmp[my_name] = ("Can't find my own primary/secondary IP"
407 port = utils.GetNodeDaemonPort()
408 for name, pip, sip in what[constants.NV_NODENETTEST]:
410 if not utils.TcpPing(pip, port, source=my_pip):
411 fail.append("primary")
413 if not utils.TcpPing(sip, port, source=my_sip):
414 fail.append("secondary")
416 tmp[name] = ("failure using the %s interface(s)" %
419 if constants.NV_LVLIST in what:
420 result[constants.NV_LVLIST] = GetVolumeList(what[constants.NV_LVLIST])
422 if constants.NV_INSTANCELIST in what:
423 result[constants.NV_INSTANCELIST] = GetInstanceList(
424 what[constants.NV_INSTANCELIST])
426 if constants.NV_VGLIST in what:
427 result[constants.NV_VGLIST] = ListVolumeGroups()
429 if constants.NV_VERSION in what:
430 result[constants.NV_VERSION] = (constants.PROTOCOL_VERSION,
431 constants.RELEASE_VERSION)
433 if constants.NV_HVINFO in what:
434 hyper = hypervisor.GetHypervisor(what[constants.NV_HVINFO])
435 result[constants.NV_HVINFO] = hyper.GetNodeInfo()
437 if constants.NV_DRBDLIST in what:
439 used_minors = bdev.DRBD8.GetUsedDevs().keys()
440 except errors.BlockDeviceError:
441 logging.warning("Can't get used minors list", exc_info=True)
443 result[constants.NV_DRBDLIST] = used_minors
448 def GetVolumeList(vg_name):
449 """Compute list of logical volumes and their size.
452 @param vg_name: the volume group whose LVs we should list
455 dictionary of all partions (key) with value being a tuple of
456 their size (in MiB), inactive and online status::
458 {'test1': ('20.06', True, True)}
460 in case of errors, a string is returned with the error
466 result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
467 "--separator=%s" % sep,
468 "-olv_name,lv_size,lv_attr", vg_name])
470 logging.error("Failed to list logical volumes, lvs output: %s",
474 valid_line_re = re.compile("^ *([^|]+)\|([0-9.]+)\|([^|]{6})\|?$")
475 for line in result.stdout.splitlines():
477 match = valid_line_re.match(line)
479 logging.error("Invalid line returned from lvs output: '%s'", line)
481 name, size, attr = match.groups()
482 inactive = attr[4] == '-'
483 online = attr[5] == 'o'
484 lvs[name] = (size, inactive, online)
489 def ListVolumeGroups():
490 """List the volume groups and their size.
493 @return: dictionary with keys volume name and values the
497 return utils.ListVolumeGroups()
501 """List all volumes on this node.
505 A list of dictionaries, each having four keys:
506 - name: the logical volume name,
507 - size: the size of the logical volume
508 - dev: the physical device on which the LV lives
509 - vg: the volume group to which it belongs
511 In case of errors, we return an empty list and log the
514 Note that since a logical volume can live on multiple physical
515 volumes, the resulting list might include a logical volume
519 result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
521 "--options=lv_name,lv_size,devices,vg_name"])
523 logging.error("Failed to list logical volumes, lvs output: %s",
529 return dev.split('(')[0]
535 'name': line[0].strip(),
536 'size': line[1].strip(),
537 'dev': parse_dev(line[2].strip()),
538 'vg': line[3].strip(),
541 return [map_line(line.split('|')) for line in result.stdout.splitlines()
542 if line.count('|') >= 3]
545 def BridgesExist(bridges_list):
546 """Check if a list of bridges exist on the current node.
549 @return: C{True} if all of them exist, C{False} otherwise
552 for bridge in bridges_list:
553 if not utils.BridgeExists(bridge):
559 def GetInstanceList(hypervisor_list):
560 """Provides a list of instances.
562 @type hypervisor_list: list
563 @param hypervisor_list: the list of hypervisors to query information
566 @return: a list of all running instances on the current node
567 - instance1.example.com
568 - instance2.example.com
572 for hname in hypervisor_list:
574 names = hypervisor.GetHypervisor(hname).ListInstances()
575 results.extend(names)
576 except errors.HypervisorError, err:
577 logging.exception("Error enumerating instances for hypevisor %s", hname)
578 # FIXME: should we somehow not propagate this to the master?
584 def GetInstanceInfo(instance, hname):
585 """Gives back the informations about an instance as a dictionary.
587 @type instance: string
588 @param instance: the instance name
590 @param hname: the hypervisor type of the instance
593 @return: dictionary with the following keys:
594 - memory: memory size of instance (int)
595 - state: xen state of instance (string)
596 - time: cpu time of instance (float)
601 iinfo = hypervisor.GetHypervisor(hname).GetInstanceInfo(instance)
602 if iinfo is not None:
603 output['memory'] = iinfo[2]
604 output['state'] = iinfo[4]
605 output['time'] = iinfo[5]
610 def GetInstanceMigratable(instance):
611 """Gives whether an instance can be migrated.
613 @type instance: L{objects.Instance}
614 @param instance: object representing the instance to be checked.
617 @return: tuple of (result, description) where:
618 - result: whether the instance can be migrated or not
619 - description: a description of the issue, if relevant
622 hyper = hypervisor.GetHypervisor(instance.hypervisor)
623 if instance.name not in hyper.ListInstances():
624 return (False, 'not running')
626 for idx in range(len(instance.disks)):
627 link_name = _GetBlockDevSymlinkPath(instance.name, idx)
628 if not os.path.islink(link_name):
629 return (False, 'not restarted since ganeti 1.2.5')
634 def GetAllInstancesInfo(hypervisor_list):
635 """Gather data about all instances.
637 This is the equivalent of L{GetInstanceInfo}, except that it
638 computes data for all instances at once, thus being faster if one
639 needs data about more than one instance.
641 @type hypervisor_list: list
642 @param hypervisor_list: list of hypervisors to query for instance data
645 @return: dictionary of instance: data, with data having the following keys:
646 - memory: memory size of instance (int)
647 - state: xen state of instance (string)
648 - time: cpu time of instance (float)
649 - vcpus: the number of vcpus
654 for hname in hypervisor_list:
655 iinfo = hypervisor.GetHypervisor(hname).GetAllInstancesInfo()
657 for name, inst_id, memory, vcpus, state, times in iinfo:
664 if name in output and output[name] != value:
665 raise errors.HypervisorError("Instance %s running duplicate"
666 " with different parameters" % name)
672 def InstanceOsAdd(instance):
673 """Add an OS to an instance.
675 @type instance: L{objects.Instance}
676 @param instance: Instance whose OS is to be installed
678 @return: the success of the operation
682 inst_os = OSFromDisk(instance.os)
683 except errors.InvalidOS, err:
684 os_name, os_dir, os_err = err.args
686 return (False, "Can't find OS '%s': %s" % (os_name, os_err))
688 return (False, "Error parsing OS '%s' in directory %s: %s" %
689 (os_name, os_dir, os_err))
691 create_env = OSEnvironment(instance)
693 logfile = "%s/add-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
694 instance.name, int(time.time()))
696 result = utils.RunCmd([inst_os.create_script], env=create_env,
697 cwd=inst_os.path, output=logfile,)
699 logging.error("os create command '%s' returned error: %s, logfile: %s,"
700 " output: %s", result.cmd, result.fail_reason, logfile,
702 lines = [utils.SafeEncode(val)
703 for val in utils.TailFile(logfile, lines=20)]
704 return (False, "OS create script failed (%s), last lines in the"
705 " log file:\n%s" % (result.fail_reason, "\n".join(lines)))
707 return (True, "Successfully installed")
710 def RunRenameInstance(instance, old_name):
711 """Run the OS rename script for an instance.
713 @type instance: L{objects.Instance}
714 @param instance: Instance whose OS is to be installed
715 @type old_name: string
716 @param old_name: previous instance name
718 @return: the success of the operation
721 inst_os = OSFromDisk(instance.os)
723 rename_env = OSEnvironment(instance)
724 rename_env['OLD_INSTANCE_NAME'] = old_name
726 logfile = "%s/rename-%s-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
728 instance.name, int(time.time()))
730 result = utils.RunCmd([inst_os.rename_script], env=rename_env,
731 cwd=inst_os.path, output=logfile)
734 logging.error("os create command '%s' returned error: %s output: %s",
735 result.cmd, result.fail_reason, result.output)
736 lines = [utils.SafeEncode(val)
737 for val in utils.TailFile(logfile, lines=20)]
738 return (False, "OS rename script failed (%s), last lines in the"
739 " log file:\n%s" % (result.fail_reason, "\n".join(lines)))
741 return (True, "Rename successful")
744 def _GetVGInfo(vg_name):
745 """Get informations about the volume group.
748 @param vg_name: the volume group which we query
751 A dictionary with the following keys:
752 - C{vg_size} is the total size of the volume group in MiB
753 - C{vg_free} is the free size of the volume group in MiB
754 - C{pv_count} are the number of physical disks in that VG
756 If an error occurs during gathering of data, we return the same dict
757 with keys all set to None.
760 retdic = dict.fromkeys(["vg_size", "vg_free", "pv_count"])
762 retval = utils.RunCmd(["vgs", "-ovg_size,vg_free,pv_count", "--noheadings",
763 "--nosuffix", "--units=m", "--separator=:", vg_name])
766 logging.error("volume group %s not present", vg_name)
768 valarr = retval.stdout.strip().rstrip(':').split(':')
772 "vg_size": int(round(float(valarr[0]), 0)),
773 "vg_free": int(round(float(valarr[1]), 0)),
774 "pv_count": int(valarr[2]),
776 except ValueError, err:
777 logging.exception("Fail to parse vgs output")
779 logging.error("vgs output has the wrong number of fields (expected"
780 " three): %s", str(valarr))
784 def _GetBlockDevSymlinkPath(instance_name, idx):
785 return os.path.join(constants.DISK_LINKS_DIR,
786 "%s:%d" % (instance_name, idx))
789 def _SymlinkBlockDev(instance_name, device_path, idx):
790 """Set up symlinks to a instance's block device.
792 This is an auxiliary function run when an instance is start (on the primary
793 node) or when an instance is migrated (on the target node).
796 @param instance_name: the name of the target instance
797 @param device_path: path of the physical block device, on the node
798 @param idx: the disk index
799 @return: absolute path to the disk's symlink
802 link_name = _GetBlockDevSymlinkPath(instance_name, idx)
804 os.symlink(device_path, link_name)
806 if err.errno == errno.EEXIST:
807 if (not os.path.islink(link_name) or
808 os.readlink(link_name) != device_path):
810 os.symlink(device_path, link_name)
817 def _RemoveBlockDevLinks(instance_name, disks):
818 """Remove the block device symlinks belonging to the given instance.
821 for idx, disk in enumerate(disks):
822 link_name = _GetBlockDevSymlinkPath(instance_name, idx)
823 if os.path.islink(link_name):
827 logging.exception("Can't remove symlink '%s'", link_name)
830 def _GatherAndLinkBlockDevs(instance):
831 """Set up an instance's block device(s).
833 This is run on the primary node at instance startup. The block
834 devices must be already assembled.
836 @type instance: L{objects.Instance}
837 @param instance: the instance whose disks we shoul assemble
839 @return: list of (disk_object, device_path)
843 for idx, disk in enumerate(instance.disks):
844 device = _RecursiveFindBD(disk)
846 raise errors.BlockDeviceError("Block device '%s' is not set up." %
850 link_name = _SymlinkBlockDev(instance.name, device.dev_path, idx)
852 raise errors.BlockDeviceError("Cannot create block device symlink: %s" %
855 block_devices.append((disk, link_name))
860 def StartInstance(instance, extra_args):
861 """Start an instance.
863 @type instance: L{objects.Instance}
864 @param instance: the instance object
866 @return: whether the startup was successful or not
869 running_instances = GetInstanceList([instance.hypervisor])
871 if instance.name in running_instances:
872 return (True, "Already running")
875 block_devices = _GatherAndLinkBlockDevs(instance)
876 hyper = hypervisor.GetHypervisor(instance.hypervisor)
877 hyper.StartInstance(instance, block_devices, extra_args)
878 except errors.BlockDeviceError, err:
879 logging.exception("Failed to start instance")
880 return (False, "Block device error: %s" % str(err))
881 except errors.HypervisorError, err:
882 logging.exception("Failed to start instance")
883 _RemoveBlockDevLinks(instance.name, instance.disks)
884 return (False, "Hypervisor error: %s" % str(err))
886 return (True, "Instance started successfully")
889 def InstanceShutdown(instance):
890 """Shut an instance down.
892 @note: this functions uses polling with a hardcoded timeout.
894 @type instance: L{objects.Instance}
895 @param instance: the instance object
897 @return: whether the startup was successful or not
900 hv_name = instance.hypervisor
901 running_instances = GetInstanceList([hv_name])
903 if instance.name not in running_instances:
904 return (True, "Instance already stopped")
906 hyper = hypervisor.GetHypervisor(hv_name)
908 hyper.StopInstance(instance)
909 except errors.HypervisorError, err:
910 msg = "Failed to stop instance %s: %s" % (instance.name, err)
914 # test every 10secs for 2min
917 for dummy in range(11):
918 if instance.name not in GetInstanceList([hv_name]):
922 # the shutdown did not succeed
923 logging.error("Shutdown of '%s' unsuccessful, using destroy",
927 hyper.StopInstance(instance, force=True)
928 except errors.HypervisorError, err:
929 msg = "Failed to force stop instance %s: %s" % (instance.name, err)
934 if instance.name in GetInstanceList([hv_name]):
935 msg = ("Could not shutdown instance %s even by destroy" %
940 _RemoveBlockDevLinks(instance.name, instance.disks)
942 return (True, "Instance has been shutdown successfully")
945 def InstanceReboot(instance, reboot_type, extra_args):
946 """Reboot an instance.
948 @type instance: L{objects.Instance}
949 @param instance: the instance object to reboot
950 @type reboot_type: str
951 @param reboot_type: the type of reboot, one the following
953 - L{constants.INSTANCE_REBOOT_SOFT}: only reboot the
954 instance OS, do not recreate the VM
955 - L{constants.INSTANCE_REBOOT_HARD}: tear down and
956 restart the VM (at the hypervisor level)
957 - the other reboot type (L{constants.INSTANCE_REBOOT_HARD})
958 is not accepted here, since that mode is handled
961 @return: the success of the operation
964 running_instances = GetInstanceList([instance.hypervisor])
966 if instance.name not in running_instances:
967 msg = "Cannot reboot instance %s that is not running" % instance.name
971 hyper = hypervisor.GetHypervisor(instance.hypervisor)
972 if reboot_type == constants.INSTANCE_REBOOT_SOFT:
974 hyper.RebootInstance(instance)
975 except errors.HypervisorError, err:
976 msg = "Failed to soft reboot instance %s: %s" % (instance.name, err)
979 elif reboot_type == constants.INSTANCE_REBOOT_HARD:
981 InstanceShutdown(instance)
982 StartInstance(instance, extra_args)
983 except errors.HypervisorError, err:
984 msg = "Failed to hard reboot instance %s: %s" % (instance.name, err)
988 return (False, "Invalid reboot_type received: %s" % (reboot_type,))
990 return (True, "Reboot successful")
993 def MigrationInfo(instance):
994 """Gather information about an instance to be migrated.
996 @type instance: L{objects.Instance}
997 @param instance: the instance definition
1000 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1002 info = hyper.MigrationInfo(instance)
1003 except errors.HypervisorError, err:
1004 msg = "Failed to fetch migration information"
1005 logging.exception(msg)
1006 return (False, '%s: %s' % (msg, err))
1010 def AcceptInstance(instance, info, target):
1011 """Prepare the node to accept an instance.
1013 @type instance: L{objects.Instance}
1014 @param instance: the instance definition
1015 @type info: string/data (opaque)
1016 @param info: migration information, from the source node
1017 @type target: string
1018 @param target: target host (usually ip), on this node
1021 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1023 hyper.AcceptInstance(instance, info, target)
1024 except errors.HypervisorError, err:
1025 msg = "Failed to accept instance"
1026 logging.exception(msg)
1027 return (False, '%s: %s' % (msg, err))
1028 return (True, "Accept successfull")
1031 def FinalizeMigration(instance, info, success):
1032 """Finalize any preparation to accept an instance.
1034 @type instance: L{objects.Instance}
1035 @param instance: the instance definition
1036 @type info: string/data (opaque)
1037 @param info: migration information, from the source node
1038 @type success: boolean
1039 @param success: whether the migration was a success or a failure
1042 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1044 hyper.FinalizeMigration(instance, info, success)
1045 except errors.HypervisorError, err:
1046 msg = "Failed to finalize migration"
1047 logging.exception(msg)
1048 return (False, '%s: %s' % (msg, err))
1049 return (True, "Migration Finalized")
1052 def MigrateInstance(instance, target, live):
1053 """Migrates an instance to another node.
1055 @type instance: L{objects.Instance}
1056 @param instance: the instance definition
1057 @type target: string
1058 @param target: the target node name
1060 @param live: whether the migration should be done live or not (the
1061 interpretation of this parameter is left to the hypervisor)
1063 @return: a tuple of (success, msg) where:
1064 - succes is a boolean denoting the success/failure of the operation
1065 - msg is a string with details in case of failure
1068 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1071 hyper.MigrateInstance(instance.name, target, live)
1072 except errors.HypervisorError, err:
1073 msg = "Failed to migrate instance"
1074 logging.exception(msg)
1075 return (False, "%s: %s" % (msg, err))
1076 return (True, "Migration successfull")
1079 def BlockdevCreate(disk, size, owner, on_primary, info):
1080 """Creates a block device for an instance.
1082 @type disk: L{objects.Disk}
1083 @param disk: the object describing the disk we should create
1085 @param size: the size of the physical underlying device, in MiB
1087 @param owner: the name of the instance for which disk is created,
1088 used for device cache data
1089 @type on_primary: boolean
1090 @param on_primary: indicates if it is the primary node or not
1092 @param info: string that will be sent to the physical device
1093 creation, used for example to set (LVM) tags on LVs
1095 @return: the new unique_id of the device (this can sometime be
1096 computed only after creation), or None. On secondary nodes,
1097 it's not required to return anything.
1102 for child in disk.children:
1104 crdev = _RecursiveAssembleBD(child, owner, on_primary)
1105 except errors.BlockDeviceError, err:
1106 errmsg = "Can't assemble device %s: %s" % (child, err)
1107 logging.error(errmsg)
1108 return False, errmsg
1109 if on_primary or disk.AssembleOnSecondary():
1110 # we need the children open in case the device itself has to
1114 except errors.BlockDeviceError, err:
1115 errmsg = "Can't make child '%s' read-write: %s" % (child, err)
1116 logging.error(errmsg)
1117 return False, errmsg
1121 device = bdev.Create(disk.dev_type, disk.physical_id, clist, size)
1122 except errors.BlockDeviceError, err:
1123 return False, "Can't create block device: %s" % str(err)
1125 if on_primary or disk.AssembleOnSecondary():
1128 except errors.BlockDeviceError, err:
1129 errmsg = ("Can't assemble device after creation, very"
1130 " unusual event: %s" % str(err))
1131 logging.error(errmsg)
1132 return False, errmsg
1133 device.SetSyncSpeed(constants.SYNC_SPEED)
1134 if on_primary or disk.OpenOnSecondary():
1136 device.Open(force=True)
1137 except errors.BlockDeviceError, err:
1138 errmsg = ("Can't make device r/w after creation, very"
1139 " unusual event: %s" % str(err))
1140 logging.error(errmsg)
1141 return False, errmsg
1142 DevCacheManager.UpdateCache(device.dev_path, owner,
1143 on_primary, disk.iv_name)
1145 device.SetInfo(info)
1147 physical_id = device.unique_id
1148 return True, physical_id
1151 def BlockdevRemove(disk):
1152 """Remove a block device.
1154 @note: This is intended to be called recursively.
1156 @type disk: L{objects.Disk}
1157 @param disk: the disk object we should remove
1159 @return: the success of the operation
1165 rdev = _RecursiveFindBD(disk)
1166 except errors.BlockDeviceError, err:
1167 # probably can't attach
1168 logging.info("Can't attach to device %s in remove", disk)
1170 if rdev is not None:
1171 r_path = rdev.dev_path
1174 except errors.BlockDeviceError, err:
1175 msgs.append(str(err))
1178 DevCacheManager.RemoveCache(r_path)
1181 for child in disk.children:
1182 c_status, c_msg = BlockdevRemove(child)
1183 result = result and c_status
1184 if c_msg: # not an empty message
1187 return (result, "; ".join(msgs))
1190 def _RecursiveAssembleBD(disk, owner, as_primary):
1191 """Activate a block device for an instance.
1193 This is run on the primary and secondary nodes for an instance.
1195 @note: this function is called recursively.
1197 @type disk: L{objects.Disk}
1198 @param disk: the disk we try to assemble
1200 @param owner: the name of the instance which owns the disk
1201 @type as_primary: boolean
1202 @param as_primary: if we should make the block device
1205 @return: the assembled device or None (in case no device
1207 @raise errors.BlockDeviceError: in case there is an error
1208 during the activation of the children or the device
1214 mcn = disk.ChildrenNeeded()
1216 mcn = 0 # max number of Nones allowed
1218 mcn = len(disk.children) - mcn # max number of Nones
1219 for chld_disk in disk.children:
1221 cdev = _RecursiveAssembleBD(chld_disk, owner, as_primary)
1222 except errors.BlockDeviceError, err:
1223 if children.count(None) >= mcn:
1226 logging.error("Error in child activation (but continuing): %s",
1228 children.append(cdev)
1230 if as_primary or disk.AssembleOnSecondary():
1231 r_dev = bdev.Assemble(disk.dev_type, disk.physical_id, children)
1232 r_dev.SetSyncSpeed(constants.SYNC_SPEED)
1234 if as_primary or disk.OpenOnSecondary():
1236 DevCacheManager.UpdateCache(r_dev.dev_path, owner,
1237 as_primary, disk.iv_name)
1244 def BlockdevAssemble(disk, owner, as_primary):
1245 """Activate a block device for an instance.
1247 This is a wrapper over _RecursiveAssembleBD.
1249 @rtype: str or boolean
1250 @return: a C{/dev/...} path for primary nodes, and
1251 C{True} for secondary nodes
1255 result = "no error information"
1257 result = _RecursiveAssembleBD(disk, owner, as_primary)
1258 if isinstance(result, bdev.BlockDev):
1259 result = result.dev_path
1260 except errors.BlockDeviceError, err:
1261 result = "Error while assembling disk: %s" % str(err)
1263 return (status, result)
1266 def BlockdevShutdown(disk):
1267 """Shut down a block device.
1269 First, if the device is assembled (Attach() is successfull), then
1270 the device is shutdown. Then the children of the device are
1273 This function is called recursively. Note that we don't cache the
1274 children or such, as oppossed to assemble, shutdown of different
1275 devices doesn't require that the upper device was active.
1277 @type disk: L{objects.Disk}
1278 @param disk: the description of the disk we should
1281 @return: the success of the operation
1286 r_dev = _RecursiveFindBD(disk)
1287 if r_dev is not None:
1288 r_path = r_dev.dev_path
1291 DevCacheManager.RemoveCache(r_path)
1292 except errors.BlockDeviceError, err:
1293 msgs.append(str(err))
1297 for child in disk.children:
1298 c_status, c_msg = BlockdevShutdown(child)
1299 result = result and c_status
1300 if c_msg: # not an empty message
1303 return (result, "; ".join(msgs))
1306 def BlockdevAddchildren(parent_cdev, new_cdevs):
1307 """Extend a mirrored block device.
1309 @type parent_cdev: L{objects.Disk}
1310 @param parent_cdev: the disk to which we should add children
1311 @type new_cdevs: list of L{objects.Disk}
1312 @param new_cdevs: the list of children which we should add
1314 @return: the success of the operation
1317 parent_bdev = _RecursiveFindBD(parent_cdev)
1318 if parent_bdev is None:
1319 logging.error("Can't find parent device")
1321 new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs]
1322 if new_bdevs.count(None) > 0:
1323 logging.error("Can't find new device(s) to add: %s:%s",
1324 new_bdevs, new_cdevs)
1326 parent_bdev.AddChildren(new_bdevs)
1330 def BlockdevRemovechildren(parent_cdev, new_cdevs):
1331 """Shrink a mirrored block device.
1333 @type parent_cdev: L{objects.Disk}
1334 @param parent_cdev: the disk from which we should remove children
1335 @type new_cdevs: list of L{objects.Disk}
1336 @param new_cdevs: the list of children which we should remove
1338 @return: the success of the operation
1341 parent_bdev = _RecursiveFindBD(parent_cdev)
1342 if parent_bdev is None:
1343 logging.error("Can't find parent in remove children: %s", parent_cdev)
1346 for disk in new_cdevs:
1347 rpath = disk.StaticDevPath()
1349 bd = _RecursiveFindBD(disk)
1351 logging.error("Can't find dynamic device %s while removing children",
1355 devs.append(bd.dev_path)
1358 parent_bdev.RemoveChildren(devs)
1362 def BlockdevGetmirrorstatus(disks):
1363 """Get the mirroring status of a list of devices.
1365 @type disks: list of L{objects.Disk}
1366 @param disks: the list of disks which we should query
1369 a list of (mirror_done, estimated_time) tuples, which
1370 are the result of L{bdev.BlockDev.CombinedSyncStatus}
1371 @raise errors.BlockDeviceError: if any of the disks cannot be
1377 rbd = _RecursiveFindBD(dsk)
1379 raise errors.BlockDeviceError("Can't find device %s" % str(dsk))
1380 stats.append(rbd.CombinedSyncStatus())
1384 def _RecursiveFindBD(disk):
1385 """Check if a device is activated.
1387 If so, return informations about the real device.
1389 @type disk: L{objects.Disk}
1390 @param disk: the disk object we need to find
1392 @return: None if the device can't be found,
1393 otherwise the device instance
1398 for chdisk in disk.children:
1399 children.append(_RecursiveFindBD(chdisk))
1401 return bdev.FindDevice(disk.dev_type, disk.physical_id, children)
1404 def BlockdevFind(disk):
1405 """Check if a device is activated.
1407 If it is, return informations about the real device.
1409 @type disk: L{objects.Disk}
1410 @param disk: the disk to find
1411 @rtype: None or tuple
1412 @return: None if the disk cannot be found, otherwise a
1413 tuple (device_path, major, minor, sync_percent,
1414 estimated_time, is_degraded)
1418 rbd = _RecursiveFindBD(disk)
1419 except errors.BlockDeviceError, err:
1420 return (False, str(err))
1423 return (True, (rbd.dev_path, rbd.major, rbd.minor) + rbd.GetSyncStatus())
1426 def UploadFile(file_name, data, mode, uid, gid, atime, mtime):
1427 """Write a file to the filesystem.
1429 This allows the master to overwrite(!) a file. It will only perform
1430 the operation if the file belongs to a list of configuration files.
1432 @type file_name: str
1433 @param file_name: the target file name
1435 @param data: the new contents of the file
1437 @param mode: the mode to give the file (can be None)
1439 @param uid: the owner of the file (can be -1 for default)
1441 @param gid: the group of the file (can be -1 for default)
1443 @param atime: the atime to set on the file (can be None)
1445 @param mtime: the mtime to set on the file (can be None)
1447 @return: the success of the operation; errors are logged
1448 in the node daemon log
1451 if not os.path.isabs(file_name):
1452 logging.error("Filename passed to UploadFile is not absolute: '%s'",
1457 constants.CLUSTER_CONF_FILE,
1458 constants.ETC_HOSTS,
1459 constants.SSH_KNOWN_HOSTS_FILE,
1460 constants.VNC_PASSWORD_FILE,
1463 if file_name not in allowed_files:
1464 logging.error("Filename passed to UploadFile not in allowed"
1465 " upload targets: '%s'", file_name)
1468 raw_data = _Decompress(data)
1470 utils.WriteFile(file_name, data=raw_data, mode=mode, uid=uid, gid=gid,
1471 atime=atime, mtime=mtime)
1475 def WriteSsconfFiles(values):
1476 """Update all ssconf files.
1478 Wrapper around the SimpleStore.WriteFiles.
1481 ssconf.SimpleStore().WriteFiles(values)
1484 def _ErrnoOrStr(err):
1485 """Format an EnvironmentError exception.
1487 If the L{err} argument has an errno attribute, it will be looked up
1488 and converted into a textual C{E...} description. Otherwise the
1489 string representation of the error will be returned.
1491 @type err: L{EnvironmentError}
1492 @param err: the exception to format
1495 if hasattr(err, 'errno'):
1496 detail = errno.errorcode[err.errno]
1502 def _OSOndiskVersion(name, os_dir):
1503 """Compute and return the API version of a given OS.
1505 This function will try to read the API version of the OS given by
1506 the 'name' parameter and residing in the 'os_dir' directory.
1509 @param name: the OS name we should look for
1511 @param os_dir: the directory inwhich we should look for the OS
1514 Either an integer denoting the version or None in the
1515 case when this is not a valid OS name.
1516 @raise errors.InvalidOS: if the OS cannot be found
1519 api_file = os.path.sep.join([os_dir, "ganeti_api_version"])
1522 st = os.stat(api_file)
1523 except EnvironmentError, err:
1524 raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file not"
1525 " found (%s)" % _ErrnoOrStr(err))
1527 if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
1528 raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file is not"
1534 api_versions = f.readlines()
1537 except EnvironmentError, err:
1538 raise errors.InvalidOS(name, os_dir, "error while reading the"
1539 " API version (%s)" % _ErrnoOrStr(err))
1541 api_versions = [version.strip() for version in api_versions]
1543 api_versions = [int(version) for version in api_versions]
1544 except (TypeError, ValueError), err:
1545 raise errors.InvalidOS(name, os_dir,
1546 "API version is not integer (%s)" % str(err))
1551 def DiagnoseOS(top_dirs=None):
1552 """Compute the validity for all OSes.
1554 @type top_dirs: list
1555 @param top_dirs: the list of directories in which to
1556 search (if not given defaults to
1557 L{constants.OS_SEARCH_PATH})
1558 @rtype: list of L{objects.OS}
1559 @return: an OS object for each name in all the given
1563 if top_dirs is None:
1564 top_dirs = constants.OS_SEARCH_PATH
1567 for dir_name in top_dirs:
1568 if os.path.isdir(dir_name):
1570 f_names = utils.ListVisibleFiles(dir_name)
1571 except EnvironmentError, err:
1572 logging.exception("Can't list the OS directory %s", dir_name)
1574 for name in f_names:
1576 os_inst = OSFromDisk(name, base_dir=dir_name)
1577 result.append(os_inst)
1578 except errors.InvalidOS, err:
1579 result.append(objects.OS.FromInvalidOS(err))
1584 def OSFromDisk(name, base_dir=None):
1585 """Create an OS instance from disk.
1587 This function will return an OS instance if the given name is a
1588 valid OS name. Otherwise, it will raise an appropriate
1589 L{errors.InvalidOS} exception, detailing why this is not a valid OS.
1591 @type base_dir: string
1592 @keyword base_dir: Base directory containing OS installations.
1593 Defaults to a search in all the OS_SEARCH_PATH dirs.
1594 @rtype: L{objects.OS}
1595 @return: the OS instance if we find a valid one
1596 @raise errors.InvalidOS: if we don't find a valid OS
1599 if base_dir is None:
1600 os_dir = utils.FindFile(name, constants.OS_SEARCH_PATH, os.path.isdir)
1602 raise errors.InvalidOS(name, None, "OS dir not found in search path")
1604 os_dir = os.path.sep.join([base_dir, name])
1606 api_versions = _OSOndiskVersion(name, os_dir)
1608 if constants.OS_API_VERSION not in api_versions:
1609 raise errors.InvalidOS(name, os_dir, "API version mismatch"
1610 " (found %s want %s)"
1611 % (api_versions, constants.OS_API_VERSION))
1613 # OS Scripts dictionary, we will populate it with the actual script names
1614 os_scripts = dict.fromkeys(constants.OS_SCRIPTS)
1616 for script in os_scripts:
1617 os_scripts[script] = os.path.sep.join([os_dir, script])
1620 st = os.stat(os_scripts[script])
1621 except EnvironmentError, err:
1622 raise errors.InvalidOS(name, os_dir, "'%s' script missing (%s)" %
1623 (script, _ErrnoOrStr(err)))
1625 if stat.S_IMODE(st.st_mode) & stat.S_IXUSR != stat.S_IXUSR:
1626 raise errors.InvalidOS(name, os_dir, "'%s' script not executable" %
1629 if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
1630 raise errors.InvalidOS(name, os_dir, "'%s' is not a regular file" %
1634 return objects.OS(name=name, path=os_dir, status=constants.OS_VALID_STATUS,
1635 create_script=os_scripts[constants.OS_SCRIPT_CREATE],
1636 export_script=os_scripts[constants.OS_SCRIPT_EXPORT],
1637 import_script=os_scripts[constants.OS_SCRIPT_IMPORT],
1638 rename_script=os_scripts[constants.OS_SCRIPT_RENAME],
1639 api_versions=api_versions)
1641 def OSEnvironment(instance, debug=0):
1642 """Calculate the environment for an os script.
1644 @type instance: L{objects.Instance}
1645 @param instance: target instance for the os script run
1646 @type debug: integer
1647 @param debug: debug level (0 or 1, for OS Api 10)
1649 @return: dict of environment variables
1650 @raise errors.BlockDeviceError: if the block device
1655 result['OS_API_VERSION'] = '%d' % constants.OS_API_VERSION
1656 result['INSTANCE_NAME'] = instance.name
1657 result['INSTANCE_OS'] = instance.os
1658 result['HYPERVISOR'] = instance.hypervisor
1659 result['DISK_COUNT'] = '%d' % len(instance.disks)
1660 result['NIC_COUNT'] = '%d' % len(instance.nics)
1661 result['DEBUG_LEVEL'] = '%d' % debug
1662 for idx, disk in enumerate(instance.disks):
1663 real_disk = _RecursiveFindBD(disk)
1664 if real_disk is None:
1665 raise errors.BlockDeviceError("Block device '%s' is not set up" %
1668 result['DISK_%d_PATH' % idx] = real_disk.dev_path
1669 # FIXME: When disks will have read-only mode, populate this
1670 result['DISK_%d_ACCESS' % idx] = disk.mode
1671 if constants.HV_DISK_TYPE in instance.hvparams:
1672 result['DISK_%d_FRONTEND_TYPE' % idx] = \
1673 instance.hvparams[constants.HV_DISK_TYPE]
1674 if disk.dev_type in constants.LDS_BLOCK:
1675 result['DISK_%d_BACKEND_TYPE' % idx] = 'block'
1676 elif disk.dev_type == constants.LD_FILE:
1677 result['DISK_%d_BACKEND_TYPE' % idx] = \
1678 'file:%s' % disk.physical_id[0]
1679 for idx, nic in enumerate(instance.nics):
1680 result['NIC_%d_MAC' % idx] = nic.mac
1682 result['NIC_%d_IP' % idx] = nic.ip
1683 result['NIC_%d_BRIDGE' % idx] = nic.bridge
1684 if constants.HV_NIC_TYPE in instance.hvparams:
1685 result['NIC_%d_FRONTEND_TYPE' % idx] = \
1686 instance.hvparams[constants.HV_NIC_TYPE]
1690 def BlockdevGrow(disk, amount):
1691 """Grow a stack of block devices.
1693 This function is called recursively, with the childrens being the
1694 first ones to resize.
1696 @type disk: L{objects.Disk}
1697 @param disk: the disk to be grown
1698 @rtype: (status, result)
1699 @return: a tuple with the status of the operation
1700 (True/False), and the errors message if status
1704 r_dev = _RecursiveFindBD(disk)
1706 return False, "Cannot find block device %s" % (disk,)
1710 except errors.BlockDeviceError, err:
1711 return False, str(err)
1716 def BlockdevSnapshot(disk):
1717 """Create a snapshot copy of a block device.
1719 This function is called recursively, and the snapshot is actually created
1720 just for the leaf lvm backend device.
1722 @type disk: L{objects.Disk}
1723 @param disk: the disk to be snapshotted
1725 @return: snapshot disk path
1729 if len(disk.children) == 1:
1730 # only one child, let's recurse on it
1731 return BlockdevSnapshot(disk.children[0])
1733 # more than one child, choose one that matches
1734 for child in disk.children:
1735 if child.size == disk.size:
1736 # return implies breaking the loop
1737 return BlockdevSnapshot(child)
1738 elif disk.dev_type == constants.LD_LV:
1739 r_dev = _RecursiveFindBD(disk)
1740 if r_dev is not None:
1741 # let's stay on the safe side and ask for the full size, for now
1742 return r_dev.Snapshot(disk.size)
1746 raise errors.ProgrammerError("Cannot snapshot non-lvm block device"
1747 " '%s' of type '%s'" %
1748 (disk.unique_id, disk.dev_type))
1751 def ExportSnapshot(disk, dest_node, instance, cluster_name, idx):
1752 """Export a block device snapshot to a remote node.
1754 @type disk: L{objects.Disk}
1755 @param disk: the description of the disk to export
1756 @type dest_node: str
1757 @param dest_node: the destination node to export to
1758 @type instance: L{objects.Instance}
1759 @param instance: the instance object to whom the disk belongs
1760 @type cluster_name: str
1761 @param cluster_name: the cluster name, needed for SSH hostalias
1763 @param idx: the index of the disk in the instance's disk list,
1764 used to export to the OS scripts environment
1766 @return: the success of the operation
1769 export_env = OSEnvironment(instance)
1771 inst_os = OSFromDisk(instance.os)
1772 export_script = inst_os.export_script
1774 logfile = "%s/exp-%s-%s-%s.log" % (constants.LOG_OS_DIR, inst_os.name,
1775 instance.name, int(time.time()))
1776 if not os.path.exists(constants.LOG_OS_DIR):
1777 os.mkdir(constants.LOG_OS_DIR, 0750)
1778 real_disk = _RecursiveFindBD(disk)
1779 if real_disk is None:
1780 raise errors.BlockDeviceError("Block device '%s' is not set up" %
1784 export_env['EXPORT_DEVICE'] = real_disk.dev_path
1785 export_env['EXPORT_INDEX'] = str(idx)
1787 destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
1788 destfile = disk.physical_id[1]
1790 # the target command is built out of three individual commands,
1791 # which are joined by pipes; we check each individual command for
1793 expcmd = utils.BuildShellCmd("cd %s; %s 2>%s", inst_os.path,
1794 export_script, logfile)
1798 destcmd = utils.BuildShellCmd("mkdir -p %s && cat > %s/%s",
1799 destdir, destdir, destfile)
1800 remotecmd = _GetSshRunner(cluster_name).BuildCmd(dest_node,
1801 constants.GANETI_RUNAS,
1804 # all commands have been checked, so we're safe to combine them
1805 command = '|'.join([expcmd, comprcmd, utils.ShellQuoteArgs(remotecmd)])
1807 result = utils.RunCmd(command, env=export_env)
1810 logging.error("os snapshot export command '%s' returned error: %s"
1811 " output: %s", command, result.fail_reason, result.output)
1817 def FinalizeExport(instance, snap_disks):
1818 """Write out the export configuration information.
1820 @type instance: L{objects.Instance}
1821 @param instance: the instance which we export, used for
1822 saving configuration
1823 @type snap_disks: list of L{objects.Disk}
1824 @param snap_disks: list of snapshot block devices, which
1825 will be used to get the actual name of the dump file
1828 @return: the success of the operation
1831 destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
1832 finaldestdir = os.path.join(constants.EXPORT_DIR, instance.name)
1834 config = objects.SerializableConfigParser()
1836 config.add_section(constants.INISECT_EXP)
1837 config.set(constants.INISECT_EXP, 'version', '0')
1838 config.set(constants.INISECT_EXP, 'timestamp', '%d' % int(time.time()))
1839 config.set(constants.INISECT_EXP, 'source', instance.primary_node)
1840 config.set(constants.INISECT_EXP, 'os', instance.os)
1841 config.set(constants.INISECT_EXP, 'compression', 'gzip')
1843 config.add_section(constants.INISECT_INS)
1844 config.set(constants.INISECT_INS, 'name', instance.name)
1845 config.set(constants.INISECT_INS, 'memory', '%d' %
1846 instance.beparams[constants.BE_MEMORY])
1847 config.set(constants.INISECT_INS, 'vcpus', '%d' %
1848 instance.beparams[constants.BE_VCPUS])
1849 config.set(constants.INISECT_INS, 'disk_template', instance.disk_template)
1852 for nic_count, nic in enumerate(instance.nics):
1854 config.set(constants.INISECT_INS, 'nic%d_mac' %
1855 nic_count, '%s' % nic.mac)
1856 config.set(constants.INISECT_INS, 'nic%d_ip' % nic_count, '%s' % nic.ip)
1857 config.set(constants.INISECT_INS, 'nic%d_bridge' % nic_count,
1859 # TODO: redundant: on load can read nics until it doesn't exist
1860 config.set(constants.INISECT_INS, 'nic_count' , '%d' % nic_total)
1863 for disk_count, disk in enumerate(snap_disks):
1866 config.set(constants.INISECT_INS, 'disk%d_ivname' % disk_count,
1867 ('%s' % disk.iv_name))
1868 config.set(constants.INISECT_INS, 'disk%d_dump' % disk_count,
1869 ('%s' % disk.physical_id[1]))
1870 config.set(constants.INISECT_INS, 'disk%d_size' % disk_count,
1873 config.set(constants.INISECT_INS, 'disk_count' , '%d' % disk_total)
1875 utils.WriteFile(os.path.join(destdir, constants.EXPORT_CONF_FILE),
1876 data=config.Dumps())
1877 shutil.rmtree(finaldestdir, True)
1878 shutil.move(destdir, finaldestdir)
1883 def ExportInfo(dest):
1884 """Get export configuration information.
1887 @param dest: directory containing the export
1889 @rtype: L{objects.SerializableConfigParser}
1890 @return: a serializable config file containing the
1894 cff = os.path.join(dest, constants.EXPORT_CONF_FILE)
1896 config = objects.SerializableConfigParser()
1899 if (not config.has_section(constants.INISECT_EXP) or
1900 not config.has_section(constants.INISECT_INS)):
1906 def ImportOSIntoInstance(instance, src_node, src_images, cluster_name):
1907 """Import an os image into an instance.
1909 @type instance: L{objects.Instance}
1910 @param instance: instance to import the disks into
1911 @type src_node: string
1912 @param src_node: source node for the disk images
1913 @type src_images: list of string
1914 @param src_images: absolute paths of the disk images
1915 @rtype: list of boolean
1916 @return: each boolean represent the success of importing the n-th disk
1919 import_env = OSEnvironment(instance)
1920 inst_os = OSFromDisk(instance.os)
1921 import_script = inst_os.import_script
1923 logfile = "%s/import-%s-%s-%s.log" % (constants.LOG_OS_DIR, instance.os,
1924 instance.name, int(time.time()))
1925 if not os.path.exists(constants.LOG_OS_DIR):
1926 os.mkdir(constants.LOG_OS_DIR, 0750)
1929 impcmd = utils.BuildShellCmd("(cd %s; %s >%s 2>&1)", inst_os.path,
1930 import_script, logfile)
1933 for idx, image in enumerate(src_images):
1935 destcmd = utils.BuildShellCmd('cat %s', image)
1936 remotecmd = _GetSshRunner(cluster_name).BuildCmd(src_node,
1937 constants.GANETI_RUNAS,
1939 command = '|'.join([utils.ShellQuoteArgs(remotecmd), comprcmd, impcmd])
1940 import_env['IMPORT_DEVICE'] = import_env['DISK_%d_PATH' % idx]
1941 import_env['IMPORT_INDEX'] = str(idx)
1942 result = utils.RunCmd(command, env=import_env)
1944 logging.error("Disk import command '%s' returned error: %s"
1945 " output: %s", command, result.fail_reason,
1947 final_result.append(False)
1949 final_result.append(True)
1951 final_result.append(True)
1957 """Return a list of exports currently available on this machine.
1960 @return: list of the exports
1963 if os.path.isdir(constants.EXPORT_DIR):
1964 return utils.ListVisibleFiles(constants.EXPORT_DIR)
1969 def RemoveExport(export):
1970 """Remove an existing export from the node.
1973 @param export: the name of the export to remove
1975 @return: the success of the operation
1978 target = os.path.join(constants.EXPORT_DIR, export)
1980 shutil.rmtree(target)
1981 # TODO: catch some of the relevant exceptions and provide a pretty
1982 # error message if rmtree fails.
1987 def BlockdevRename(devlist):
1988 """Rename a list of block devices.
1990 @type devlist: list of tuples
1991 @param devlist: list of tuples of the form (disk,
1992 new_logical_id, new_physical_id); disk is an
1993 L{objects.Disk} object describing the current disk,
1994 and new logical_id/physical_id is the name we
1997 @return: True if all renames succeeded, False otherwise
2001 for disk, unique_id in devlist:
2002 dev = _RecursiveFindBD(disk)
2007 old_rpath = dev.dev_path
2008 dev.Rename(unique_id)
2009 new_rpath = dev.dev_path
2010 if old_rpath != new_rpath:
2011 DevCacheManager.RemoveCache(old_rpath)
2012 # FIXME: we should add the new cache information here, like:
2013 # DevCacheManager.UpdateCache(new_rpath, owner, ...)
2014 # but we don't have the owner here - maybe parse from existing
2015 # cache? for now, we only lose lvm data when we rename, which
2016 # is less critical than DRBD or MD
2017 except errors.BlockDeviceError, err:
2018 logging.exception("Can't rename device '%s' to '%s'", dev, unique_id)
2023 def _TransformFileStorageDir(file_storage_dir):
2024 """Checks whether given file_storage_dir is valid.
2026 Checks wheter the given file_storage_dir is within the cluster-wide
2027 default file_storage_dir stored in SimpleStore. Only paths under that
2028 directory are allowed.
2030 @type file_storage_dir: str
2031 @param file_storage_dir: the path to check
2033 @return: the normalized path if valid, None otherwise
2037 file_storage_dir = os.path.normpath(file_storage_dir)
2038 base_file_storage_dir = cfg.GetFileStorageDir()
2039 if (not os.path.commonprefix([file_storage_dir, base_file_storage_dir]) ==
2040 base_file_storage_dir):
2041 logging.error("file storage directory '%s' is not under base file"
2042 " storage directory '%s'",
2043 file_storage_dir, base_file_storage_dir)
2045 return file_storage_dir
2048 def CreateFileStorageDir(file_storage_dir):
2049 """Create file storage directory.
2051 @type file_storage_dir: str
2052 @param file_storage_dir: directory to create
2055 @return: tuple with first element a boolean indicating wheter dir
2056 creation was successful or not
2059 file_storage_dir = _TransformFileStorageDir(file_storage_dir)
2061 if not file_storage_dir:
2064 if os.path.exists(file_storage_dir):
2065 if not os.path.isdir(file_storage_dir):
2066 logging.error("'%s' is not a directory", file_storage_dir)
2070 os.makedirs(file_storage_dir, 0750)
2071 except OSError, err:
2072 logging.error("Cannot create file storage directory '%s': %s",
2073 file_storage_dir, err)
2078 def RemoveFileStorageDir(file_storage_dir):
2079 """Remove file storage directory.
2081 Remove it only if it's empty. If not log an error and return.
2083 @type file_storage_dir: str
2084 @param file_storage_dir: the directory we should cleanup
2085 @rtype: tuple (success,)
2086 @return: tuple of one element, C{success}, denoting
2087 whether the operation was successfull
2090 file_storage_dir = _TransformFileStorageDir(file_storage_dir)
2092 if not file_storage_dir:
2095 if os.path.exists(file_storage_dir):
2096 if not os.path.isdir(file_storage_dir):
2097 logging.error("'%s' is not a directory", file_storage_dir)
2099 # deletes dir only if empty, otherwise we want to return False
2101 os.rmdir(file_storage_dir)
2102 except OSError, err:
2103 logging.exception("Cannot remove file storage directory '%s'",
2109 def RenameFileStorageDir(old_file_storage_dir, new_file_storage_dir):
2110 """Rename the file storage directory.
2112 @type old_file_storage_dir: str
2113 @param old_file_storage_dir: the current path
2114 @type new_file_storage_dir: str
2115 @param new_file_storage_dir: the name we should rename to
2116 @rtype: tuple (success,)
2117 @return: tuple of one element, C{success}, denoting
2118 whether the operation was successful
2121 old_file_storage_dir = _TransformFileStorageDir(old_file_storage_dir)
2122 new_file_storage_dir = _TransformFileStorageDir(new_file_storage_dir)
2124 if not old_file_storage_dir or not new_file_storage_dir:
2127 if not os.path.exists(new_file_storage_dir):
2128 if os.path.isdir(old_file_storage_dir):
2130 os.rename(old_file_storage_dir, new_file_storage_dir)
2131 except OSError, err:
2132 logging.exception("Cannot rename '%s' to '%s'",
2133 old_file_storage_dir, new_file_storage_dir)
2136 logging.error("'%s' is not a directory", old_file_storage_dir)
2139 if os.path.exists(old_file_storage_dir):
2140 logging.error("Cannot rename '%s' to '%s'. Both locations exist.",
2141 old_file_storage_dir, new_file_storage_dir)
2146 def _IsJobQueueFile(file_name):
2147 """Checks whether the given filename is in the queue directory.
2149 @type file_name: str
2150 @param file_name: the file name we should check
2152 @return: whether the file is under the queue directory
2155 queue_dir = os.path.normpath(constants.QUEUE_DIR)
2156 result = (os.path.commonprefix([queue_dir, file_name]) == queue_dir)
2159 logging.error("'%s' is not a file in the queue directory",
2165 def JobQueueUpdate(file_name, content):
2166 """Updates a file in the queue directory.
2168 This is just a wrapper over L{utils.WriteFile}, with proper
2171 @type file_name: str
2172 @param file_name: the job file name
2174 @param content: the new job contents
2176 @return: the success of the operation
2179 if not _IsJobQueueFile(file_name):
2182 # Write and replace the file atomically
2183 utils.WriteFile(file_name, data=_Decompress(content))
2188 def JobQueueRename(old, new):
2189 """Renames a job queue file.
2191 This is just a wrapper over os.rename with proper checking.
2194 @param old: the old (actual) file name
2196 @param new: the desired file name
2198 @return: the success of the operation
2201 if not (_IsJobQueueFile(old) and _IsJobQueueFile(new)):
2204 utils.RenameFile(old, new, mkdir=True)
2209 def JobQueueSetDrainFlag(drain_flag):
2210 """Set the drain flag for the queue.
2212 This will set or unset the queue drain flag.
2214 @type drain_flag: boolean
2215 @param drain_flag: if True, will set the drain flag, otherwise reset it.
2217 @return: always True
2218 @warning: the function always returns True
2222 utils.WriteFile(constants.JOB_QUEUE_DRAIN_FILE, data="", close=True)
2224 utils.RemoveFile(constants.JOB_QUEUE_DRAIN_FILE)
2229 def BlockdevClose(instance_name, disks):
2230 """Closes the given block devices.
2232 This means they will be switched to secondary mode (in case of
2235 @param instance_name: if the argument is not empty, the symlinks
2236 of this instance will be removed
2237 @type disks: list of L{objects.Disk}
2238 @param disks: the list of disks to be closed
2239 @rtype: tuple (success, message)
2240 @return: a tuple of success and message, where success
2241 indicates the succes of the operation, and message
2242 which will contain the error details in case we
2248 rd = _RecursiveFindBD(cf)
2250 return (False, "Can't find device %s" % cf)
2257 except errors.BlockDeviceError, err:
2258 msg.append(str(err))
2260 return (False, "Can't make devices secondary: %s" % ",".join(msg))
2263 _RemoveBlockDevLinks(instance_name, disks)
2264 return (True, "All devices secondary")
2267 def ValidateHVParams(hvname, hvparams):
2268 """Validates the given hypervisor parameters.
2270 @type hvname: string
2271 @param hvname: the hypervisor name
2272 @type hvparams: dict
2273 @param hvparams: the hypervisor parameters to be validated
2274 @rtype: tuple (success, message)
2275 @return: a tuple of success and message, where success
2276 indicates the succes of the operation, and message
2277 which will contain the error details in case we
2282 hv_type = hypervisor.GetHypervisor(hvname)
2283 hv_type.ValidateParameters(hvparams)
2284 return (True, "Validation passed")
2285 except errors.HypervisorError, err:
2286 return (False, str(err))
2290 """Demotes the current node from master candidate role.
2293 # try to ensure we're not the master by mistake
2294 master, myself = ssconf.GetMasterAndMyself()
2295 if master == myself:
2296 return (False, "ssconf status shows I'm the master node, will not demote")
2297 pid_file = utils.DaemonPidFileName(constants.MASTERD_PID)
2298 if utils.IsProcessAlive(utils.ReadPidFile(pid_file)):
2299 return (False, "The master daemon is running, will not demote")
2301 utils.CreateBackup(constants.CLUSTER_CONF_FILE)
2302 except EnvironmentError, err:
2303 if err.errno != errno.ENOENT:
2304 return (False, "Error while backing up cluster file: %s" % str(err))
2305 utils.RemoveFile(constants.CLUSTER_CONF_FILE)
2306 return (True, "Done")
2309 def _FindDisks(nodes_ip, disks):
2310 """Sets the physical ID on disks and returns the block devices.
2313 # set the correct physical ID
2314 my_name = utils.HostInfo().name
2316 cf.SetPhysicalID(my_name, nodes_ip)
2321 rd = _RecursiveFindBD(cf)
2323 return (False, "Can't find device %s" % cf)
2325 return (True, bdevs)
2328 def DrbdDisconnectNet(nodes_ip, disks):
2329 """Disconnects the network on a list of drbd devices.
2332 status, bdevs = _FindDisks(nodes_ip, disks)
2334 return status, bdevs
2340 except errors.BlockDeviceError, err:
2341 logging.exception("Failed to go into standalone mode")
2342 return (False, "Can't change network configuration: %s" % str(err))
2343 return (True, "All disks are now disconnected")
2346 def DrbdAttachNet(nodes_ip, disks, instance_name, multimaster):
2347 """Attaches the network on a list of drbd devices.
2350 status, bdevs = _FindDisks(nodes_ip, disks)
2352 return status, bdevs
2355 for idx, rd in enumerate(bdevs):
2357 _SymlinkBlockDev(instance_name, rd.dev_path, idx)
2358 except EnvironmentError, err:
2359 return (False, "Can't create symlink: %s" % str(err))
2360 # reconnect disks, switch to new master configuration and if
2361 # needed primary mode
2364 rd.AttachNet(multimaster)
2365 except errors.BlockDeviceError, err:
2366 return (False, "Can't change network configuration: %s" % str(err))
2367 # wait until the disks are connected; we need to retry the re-attach
2368 # if the device becomes standalone, as this might happen if the one
2369 # node disconnects and reconnects in a different mode before the
2370 # other node reconnects; in this case, one or both of the nodes will
2371 # decide it has wrong configuration and switch to standalone
2372 RECONNECT_TIMEOUT = 2 * 60
2373 sleep_time = 0.100 # start with 100 miliseconds
2374 timeout_limit = time.time() + RECONNECT_TIMEOUT
2375 while time.time() < timeout_limit:
2376 all_connected = True
2378 stats = rd.GetProcStatus()
2379 if not (stats.is_connected or stats.is_in_resync):
2380 all_connected = False
2381 if stats.is_standalone:
2382 # peer had different config info and this node became
2383 # standalone, even though this should not happen with the
2384 # new staged way of changing disk configs
2386 rd.ReAttachNet(multimaster)
2387 except errors.BlockDeviceError, err:
2388 return (False, "Can't change network configuration: %s" % str(err))
2391 time.sleep(sleep_time)
2392 sleep_time = min(5, sleep_time * 1.5)
2393 if not all_connected:
2394 return (False, "Timeout in disk reconnecting")
2396 # change to primary mode
2400 except errors.BlockDeviceError, err:
2401 return (False, "Can't change to primary mode: %s" % str(err))
2403 msg = "multi-master and primary"
2405 msg = "single-master"
2406 return (True, "Disks are now configured as %s" % msg)
2409 def DrbdWaitSync(nodes_ip, disks):
2410 """Wait until DRBDs have synchronized.
2413 status, bdevs = _FindDisks(nodes_ip, disks)
2415 return status, bdevs
2421 stats = rd.GetProcStatus()
2422 if not (stats.is_connected or stats.is_in_resync):
2425 alldone = alldone and (not stats.is_in_resync)
2426 if stats.sync_percent is not None:
2427 min_resync = min(min_resync, stats.sync_percent)
2428 return (not failure, (alldone, min_resync))
2431 class HooksRunner(object):
2434 This class is instantiated on the node side (ganeti-noded) and not
2438 RE_MASK = re.compile("^[a-zA-Z0-9_-]+$")
2440 def __init__(self, hooks_base_dir=None):
2441 """Constructor for hooks runner.
2443 @type hooks_base_dir: str or None
2444 @param hooks_base_dir: if not None, this overrides the
2445 L{constants.HOOKS_BASE_DIR} (useful for unittests)
2448 if hooks_base_dir is None:
2449 hooks_base_dir = constants.HOOKS_BASE_DIR
2450 self._BASE_DIR = hooks_base_dir
2453 def ExecHook(script, env):
2454 """Exec one hook script.
2457 @param script: the full path to the script
2459 @param env: the environment with which to exec the script
2460 @rtype: tuple (success, message)
2461 @return: a tuple of success and message, where success
2462 indicates the succes of the operation, and message
2463 which will contain the error details in case we
2467 # exec the process using subprocess and log the output
2470 fdstdin = open("/dev/null", "r")
2471 child = subprocess.Popen([script], stdin=fdstdin, stdout=subprocess.PIPE,
2472 stderr=subprocess.STDOUT, close_fds=True,
2473 shell=False, cwd="/", env=env)
2476 output = child.stdout.read(4096)
2477 child.stdout.close()
2478 except EnvironmentError, err:
2479 output += "Hook script error: %s" % str(err)
2483 result = child.wait()
2485 except EnvironmentError, err:
2486 if err.errno == errno.EINTR:
2490 # try not to leak fds
2491 for fd in (fdstdin, ):
2495 except EnvironmentError, err:
2496 # just log the error
2497 #logging.exception("Error while closing fd %s", fd)
2500 return result == 0, utils.SafeEncode(output.strip())
2502 def RunHooks(self, hpath, phase, env):
2503 """Run the scripts in the hooks directory.
2506 @param hpath: the path to the hooks directory which
2509 @param phase: either L{constants.HOOKS_PHASE_PRE} or
2510 L{constants.HOOKS_PHASE_POST}
2512 @param env: dictionary with the environment for the hook
2514 @return: list of 3-element tuples:
2516 - script result, either L{constants.HKR_SUCCESS} or
2517 L{constants.HKR_FAIL}
2518 - output of the script
2520 @raise errors.ProgrammerError: for invalid input
2524 if phase == constants.HOOKS_PHASE_PRE:
2526 elif phase == constants.HOOKS_PHASE_POST:
2529 raise errors.ProgrammerError("Unknown hooks phase: '%s'" % phase)
2532 subdir = "%s-%s.d" % (hpath, suffix)
2533 dir_name = "%s/%s" % (self._BASE_DIR, subdir)
2535 dir_contents = utils.ListVisibleFiles(dir_name)
2536 except OSError, err:
2537 # FIXME: must log output in case of failures
2540 # we use the standard python sort order,
2541 # so 00name is the recommended naming scheme
2543 for relname in dir_contents:
2544 fname = os.path.join(dir_name, relname)
2545 if not (os.path.isfile(fname) and os.access(fname, os.X_OK) and
2546 self.RE_MASK.match(relname) is not None):
2547 rrval = constants.HKR_SKIP
2550 result, output = self.ExecHook(fname, env)
2552 rrval = constants.HKR_FAIL
2554 rrval = constants.HKR_SUCCESS
2555 rr.append(("%s/%s" % (subdir, relname), rrval, output))
2560 class IAllocatorRunner(object):
2561 """IAllocator runner.
2563 This class is instantiated on the node side (ganeti-noded) and not on
2567 def Run(self, name, idata):
2568 """Run an iallocator script.
2571 @param name: the iallocator script name
2573 @param idata: the allocator input data
2576 @return: four element tuple of:
2577 - run status (one of the IARUN_ constants)
2580 - fail reason (as from L{utils.RunResult})
2583 alloc_script = utils.FindFile(name, constants.IALLOCATOR_SEARCH_PATH,
2585 if alloc_script is None:
2586 return (constants.IARUN_NOTFOUND, None, None, None)
2588 fd, fin_name = tempfile.mkstemp(prefix="ganeti-iallocator.")
2592 result = utils.RunCmd([alloc_script, fin_name])
2594 return (constants.IARUN_FAILURE, result.stdout, result.stderr,
2599 return (constants.IARUN_SUCCESS, result.stdout, result.stderr, None)
2602 class DevCacheManager(object):
2603 """Simple class for managing a cache of block device information.
2606 _DEV_PREFIX = "/dev/"
2607 _ROOT_DIR = constants.BDEV_CACHE_DIR
2610 def _ConvertPath(cls, dev_path):
2611 """Converts a /dev/name path to the cache file name.
2613 This replaces slashes with underscores and strips the /dev
2614 prefix. It then returns the full path to the cache file.
2617 @param dev_path: the C{/dev/} path name
2619 @return: the converted path name
2622 if dev_path.startswith(cls._DEV_PREFIX):
2623 dev_path = dev_path[len(cls._DEV_PREFIX):]
2624 dev_path = dev_path.replace("/", "_")
2625 fpath = "%s/bdev_%s" % (cls._ROOT_DIR, dev_path)
2629 def UpdateCache(cls, dev_path, owner, on_primary, iv_name):
2630 """Updates the cache information for a given device.
2633 @param dev_path: the pathname of the device
2635 @param owner: the owner (instance name) of the device
2636 @type on_primary: bool
2637 @param on_primary: whether this is the primary
2640 @param iv_name: the instance-visible name of the
2641 device, as in objects.Disk.iv_name
2646 if dev_path is None:
2647 logging.error("DevCacheManager.UpdateCache got a None dev_path")
2649 fpath = cls._ConvertPath(dev_path)
2655 iv_name = "not_visible"
2656 fdata = "%s %s %s\n" % (str(owner), state, iv_name)
2658 utils.WriteFile(fpath, data=fdata)
2659 except EnvironmentError, err:
2660 logging.exception("Can't update bdev cache for %s", dev_path)
2663 def RemoveCache(cls, dev_path):
2664 """Remove data for a dev_path.
2666 This is just a wrapper over L{utils.RemoveFile} with a converted
2667 path name and logging.
2670 @param dev_path: the pathname of the device
2675 if dev_path is None:
2676 logging.error("DevCacheManager.RemoveCache got a None dev_path")
2678 fpath = cls._ConvertPath(dev_path)
2680 utils.RemoveFile(fpath)
2681 except EnvironmentError, err:
2682 logging.exception("Can't update bdev cache for %s", dev_path)