4 # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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
24 @var _ALLOWED_UPLOAD_FILES: denotes which files are accepted in
25 the L{UploadFile} function
26 @var _ALLOWED_CLEAN_DIRS: denotes which directories are accepted
27 in the L{_CleanDirectory} function
31 # pylint: disable-msg=E1103
33 # E1103: %s %r has no %r member (but some types could not be
34 # inferred), because the _TryOSFromDisk returns either (True, os_obj)
35 # or (False, "string") which confuses pylint
52 from ganeti import errors
53 from ganeti import utils
54 from ganeti import ssh
55 from ganeti import hypervisor
56 from ganeti import constants
57 from ganeti import bdev
58 from ganeti import objects
59 from ganeti import ssconf
60 from ganeti import serializer
61 from ganeti import netutils
62 from ganeti import runtime
65 _BOOT_ID_PATH = "/proc/sys/kernel/random/boot_id"
66 _ALLOWED_CLEAN_DIRS = frozenset([
68 constants.JOB_QUEUE_ARCHIVE_DIR,
70 constants.CRYPTO_KEYS_DIR,
72 _MAX_SSL_CERT_VALIDITY = 7 * 24 * 60 * 60
73 _X509_KEY_FILE = "key"
74 _X509_CERT_FILE = "cert"
75 _IES_STATUS_FILE = "status"
79 #: Valid LVS output line regex
80 _LVSLINE_REGEX = re.compile("^ *([^|]+)\|([^|]+)\|([0-9.]+)\|([^|]{6})\|?$")
83 class RPCFail(Exception):
84 """Class denoting RPC failure.
86 Its argument is the error message.
91 def _Fail(msg, *args, **kwargs):
92 """Log an error and the raise an RPCFail exception.
94 This exception is then handled specially in the ganeti daemon and
95 turned into a 'failed' return type. As such, this function is a
96 useful shortcut for logging the error and returning it to the master
100 @param msg: the text of the exception
106 if "log" not in kwargs or kwargs["log"]: # if we should log this error
107 if "exc" in kwargs and kwargs["exc"]:
108 logging.exception(msg)
115 """Simple wrapper to return a SimpleStore.
117 @rtype: L{ssconf.SimpleStore}
118 @return: a SimpleStore instance
121 return ssconf.SimpleStore()
124 def _GetSshRunner(cluster_name):
125 """Simple wrapper to return an SshRunner.
127 @type cluster_name: str
128 @param cluster_name: the cluster name, which is needed
129 by the SshRunner constructor
130 @rtype: L{ssh.SshRunner}
131 @return: an SshRunner instance
134 return ssh.SshRunner(cluster_name)
137 def _Decompress(data):
138 """Unpacks data compressed by the RPC client.
140 @type data: list or tuple
141 @param data: Data sent by RPC client
143 @return: Decompressed data
146 assert isinstance(data, (list, tuple))
147 assert len(data) == 2
148 (encoding, content) = data
149 if encoding == constants.RPC_ENCODING_NONE:
151 elif encoding == constants.RPC_ENCODING_ZLIB_BASE64:
152 return zlib.decompress(base64.b64decode(content))
154 raise AssertionError("Unknown data encoding")
157 def _CleanDirectory(path, exclude=None):
158 """Removes all regular files in a directory.
161 @param path: the directory to clean
163 @param exclude: list of files to be excluded, defaults
167 if path not in _ALLOWED_CLEAN_DIRS:
168 _Fail("Path passed to _CleanDirectory not in allowed clean targets: '%s'",
171 if not os.path.isdir(path):
176 # Normalize excluded paths
177 exclude = [os.path.normpath(i) for i in exclude]
179 for rel_name in utils.ListVisibleFiles(path):
180 full_name = utils.PathJoin(path, rel_name)
181 if full_name in exclude:
183 if os.path.isfile(full_name) and not os.path.islink(full_name):
184 utils.RemoveFile(full_name)
187 def _BuildUploadFileList():
188 """Build the list of allowed upload files.
190 This is abstracted so that it's built only once at module import time.
193 allowed_files = set([
194 constants.CLUSTER_CONF_FILE,
196 constants.SSH_KNOWN_HOSTS_FILE,
197 constants.VNC_PASSWORD_FILE,
198 constants.RAPI_CERT_FILE,
199 constants.RAPI_USERS_FILE,
200 constants.CONFD_HMAC_KEY,
201 constants.CLUSTER_DOMAIN_SECRET_FILE,
204 for hv_name in constants.HYPER_TYPES:
205 hv_class = hypervisor.GetHypervisorClass(hv_name)
206 allowed_files.update(hv_class.GetAncillaryFiles())
208 return frozenset(allowed_files)
211 _ALLOWED_UPLOAD_FILES = _BuildUploadFileList()
215 """Removes job queue files and archived jobs.
221 _CleanDirectory(constants.QUEUE_DIR, exclude=[constants.JOB_QUEUE_LOCK_FILE])
222 _CleanDirectory(constants.JOB_QUEUE_ARCHIVE_DIR)
226 """Returns master information.
228 This is an utility function to compute master information, either
229 for consumption here or from the node daemon.
232 @return: master_netdev, master_ip, master_name, primary_ip_family
233 @raise RPCFail: in case of errors
238 master_netdev = cfg.GetMasterNetdev()
239 master_ip = cfg.GetMasterIP()
240 master_node = cfg.GetMasterNode()
241 primary_ip_family = cfg.GetPrimaryIPFamily()
242 except errors.ConfigurationError, err:
243 _Fail("Cluster configuration incomplete: %s", err, exc=True)
244 return (master_netdev, master_ip, master_node, primary_ip_family)
247 def StartMaster(start_daemons, no_voting):
248 """Activate local node as master node.
250 The function will either try activate the IP address of the master
251 (unless someone else has it) or also start the master daemons, based
252 on the start_daemons parameter.
254 @type start_daemons: boolean
255 @param start_daemons: whether to start the master daemons
256 (ganeti-masterd and ganeti-rapi), or (if false) activate the
258 @type no_voting: boolean
259 @param no_voting: whether to start ganeti-masterd without a node vote
260 (if start_daemons is True), but still non-interactively
264 # GetMasterInfo will raise an exception if not able to return data
265 master_netdev, master_ip, _, family = GetMasterInfo()
268 # either start the master and rapi daemons
271 masterd_args = "--no-voting --yes-do-it"
276 "EXTRA_MASTERD_ARGS": masterd_args,
279 result = utils.RunCmd([constants.DAEMON_UTIL, "start-master"], env=env)
281 msg = "Can't start Ganeti master: %s" % result.output
286 if netutils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
287 if netutils.IPAddress.Own(master_ip):
288 # we already have the ip:
289 logging.debug("Master IP already configured, doing nothing")
291 msg = "Someone else has the master ip, not activating"
295 ipcls = netutils.IP4Address
296 if family == netutils.IP6Address.family:
297 ipcls = netutils.IP6Address
299 result = utils.RunCmd(["ip", "address", "add",
300 "%s/%d" % (master_ip, ipcls.iplen),
301 "dev", master_netdev, "label",
302 "%s:0" % master_netdev])
304 msg = "Can't activate master IP: %s" % result.output
308 # we ignore the exit code of the following cmds
309 if ipcls == netutils.IP4Address:
310 utils.RunCmd(["arping", "-q", "-U", "-c 3", "-I", master_netdev, "-s",
311 master_ip, master_ip])
312 elif ipcls == netutils.IP6Address:
314 utils.RunCmd(["ndisc6", "-q", "-r 3", master_ip, master_netdev])
315 except errors.OpExecError:
316 # TODO: Better error reporting
317 logging.warning("Can't execute ndisc6, please install if missing")
320 _Fail("; ".join(err_msgs))
323 def StopMaster(stop_daemons):
324 """Deactivate this node as master.
326 The function will always try to deactivate the IP address of the
327 master. It will also stop the master daemons depending on the
328 stop_daemons parameter.
330 @type stop_daemons: boolean
331 @param stop_daemons: whether to also stop the master daemons
332 (ganeti-masterd and ganeti-rapi)
336 # TODO: log and report back to the caller the error failures; we
337 # need to decide in which case we fail the RPC for this
339 # GetMasterInfo will raise an exception if not able to return data
340 master_netdev, master_ip, _, family = GetMasterInfo()
342 ipcls = netutils.IP4Address
343 if family == netutils.IP6Address.family:
344 ipcls = netutils.IP6Address
346 result = utils.RunCmd(["ip", "address", "del",
347 "%s/%d" % (master_ip, ipcls.iplen),
348 "dev", master_netdev])
350 logging.error("Can't remove the master IP, error: %s", result.output)
351 # but otherwise ignore the failure
354 result = utils.RunCmd([constants.DAEMON_UTIL, "stop-master"])
356 logging.error("Could not stop Ganeti master, command %s had exitcode %s"
358 result.cmd, result.exit_code, result.output)
361 def EtcHostsModify(mode, host, ip):
362 """Modify a host entry in /etc/hosts.
364 @param mode: The mode to operate. Either add or remove entry
365 @param host: The host to operate on
366 @param ip: The ip associated with the entry
369 if mode == constants.ETC_HOSTS_ADD:
371 RPCFail("Mode 'add' needs 'ip' parameter, but parameter not"
373 utils.AddHostToEtcHosts(host, ip)
374 elif mode == constants.ETC_HOSTS_REMOVE:
376 RPCFail("Mode 'remove' does not allow 'ip' parameter, but"
377 " parameter is present")
378 utils.RemoveHostFromEtcHosts(host)
380 RPCFail("Mode not supported")
383 def LeaveCluster(modify_ssh_setup):
384 """Cleans up and remove the current node.
386 This function cleans up and prepares the current node to be removed
389 If processing is successful, then it raises an
390 L{errors.QuitGanetiException} which is used as a special case to
391 shutdown the node daemon.
393 @param modify_ssh_setup: boolean
396 _CleanDirectory(constants.DATA_DIR)
397 _CleanDirectory(constants.CRYPTO_KEYS_DIR)
402 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
404 utils.RemoveAuthorizedKey(auth_keys, utils.ReadFile(pub_key))
406 utils.RemoveFile(priv_key)
407 utils.RemoveFile(pub_key)
408 except errors.OpExecError:
409 logging.exception("Error while processing ssh files")
412 utils.RemoveFile(constants.CONFD_HMAC_KEY)
413 utils.RemoveFile(constants.RAPI_CERT_FILE)
414 utils.RemoveFile(constants.NODED_CERT_FILE)
415 except: # pylint: disable-msg=W0702
416 logging.exception("Error while removing cluster secrets")
418 result = utils.RunCmd([constants.DAEMON_UTIL, "stop", constants.CONFD])
420 logging.error("Command %s failed with exitcode %s and error %s",
421 result.cmd, result.exit_code, result.output)
423 # Raise a custom exception (handled in ganeti-noded)
424 raise errors.QuitGanetiException(True, 'Shutdown scheduled')
427 def GetNodeInfo(vgname, hypervisor_type):
428 """Gives back a hash with different information about the node.
430 @type vgname: C{string}
431 @param vgname: the name of the volume group to ask for disk space information
432 @type hypervisor_type: C{str}
433 @param hypervisor_type: the name of the hypervisor to ask for
436 @return: dictionary with the following keys:
437 - vg_size is the size of the configured volume group in MiB
438 - vg_free is the free size of the volume group in MiB
439 - memory_dom0 is the memory allocated for domain0 in MiB
440 - memory_free is the currently available (free) ram in MiB
441 - memory_total is the total number of ram in MiB
446 if vgname is not None:
447 vginfo = bdev.LogicalVolume.GetVGInfo([vgname])
448 vg_free = vg_size = None
450 vg_free = int(round(vginfo[0][0], 0))
451 vg_size = int(round(vginfo[0][1], 0))
452 outputarray['vg_size'] = vg_size
453 outputarray['vg_free'] = vg_free
455 if hypervisor_type is not None:
456 hyper = hypervisor.GetHypervisor(hypervisor_type)
457 hyp_info = hyper.GetNodeInfo()
458 if hyp_info is not None:
459 outputarray.update(hyp_info)
461 outputarray["bootid"] = utils.ReadFile(_BOOT_ID_PATH, size=128).rstrip("\n")
466 def VerifyNode(what, cluster_name):
467 """Verify the status of the local node.
469 Based on the input L{what} parameter, various checks are done on the
472 If the I{filelist} key is present, this list of
473 files is checksummed and the file/checksum pairs are returned.
475 If the I{nodelist} key is present, we check that we have
476 connectivity via ssh with the target nodes (and check the hostname
479 If the I{node-net-test} key is present, we check that we have
480 connectivity to the given nodes via both primary IP and, if
481 applicable, secondary IPs.
484 @param what: a dictionary of things to check:
485 - filelist: list of files for which to compute checksums
486 - nodelist: list of nodes we should check ssh communication with
487 - node-net-test: list of nodes we should check node daemon port
489 - hypervisor: list with hypervisors to run the verify for
491 @return: a dictionary with the same keys as the input dict, and
492 values representing the result of the checks
496 my_name = netutils.Hostname.GetSysName()
497 port = netutils.GetDaemonPort(constants.NODED)
498 vm_capable = my_name not in what.get(constants.NV_VMNODES, [])
500 if constants.NV_HYPERVISOR in what and vm_capable:
501 result[constants.NV_HYPERVISOR] = tmp = {}
502 for hv_name in what[constants.NV_HYPERVISOR]:
504 val = hypervisor.GetHypervisor(hv_name).Verify()
505 except errors.HypervisorError, err:
506 val = "Error while checking hypervisor: %s" % str(err)
509 if constants.NV_HVPARAMS in what and vm_capable:
510 result[constants.NV_HVPARAMS] = tmp = []
511 for source, hv_name, hvparms in what[constants.NV_HVPARAMS]:
513 logging.info("Validating hv %s, %s", hv_name, hvparms)
514 hypervisor.GetHypervisor(hv_name).ValidateParameters(hvparms)
515 except errors.HypervisorError, err:
516 tmp.append((source, hv_name, str(err)))
518 if constants.NV_FILELIST in what:
519 result[constants.NV_FILELIST] = utils.FingerprintFiles(
520 what[constants.NV_FILELIST])
522 if constants.NV_NODELIST in what:
523 result[constants.NV_NODELIST] = tmp = {}
524 random.shuffle(what[constants.NV_NODELIST])
525 for node in what[constants.NV_NODELIST]:
526 success, message = _GetSshRunner(cluster_name).VerifyNodeHostname(node)
530 if constants.NV_NODENETTEST in what:
531 result[constants.NV_NODENETTEST] = tmp = {}
532 my_pip = my_sip = None
533 for name, pip, sip in what[constants.NV_NODENETTEST]:
539 tmp[my_name] = ("Can't find my own primary/secondary IP"
542 for name, pip, sip in what[constants.NV_NODENETTEST]:
544 if not netutils.TcpPing(pip, port, source=my_pip):
545 fail.append("primary")
547 if not netutils.TcpPing(sip, port, source=my_sip):
548 fail.append("secondary")
550 tmp[name] = ("failure using the %s interface(s)" %
553 if constants.NV_MASTERIP in what:
554 # FIXME: add checks on incoming data structures (here and in the
555 # rest of the function)
556 master_name, master_ip = what[constants.NV_MASTERIP]
557 if master_name == my_name:
558 source = constants.IP4_ADDRESS_LOCALHOST
561 result[constants.NV_MASTERIP] = netutils.TcpPing(master_ip, port,
564 if constants.NV_OOB_PATHS in what:
565 result[constants.NV_OOB_PATHS] = tmp = []
566 for path in what[constants.NV_OOB_PATHS]:
570 tmp.append("error stating out of band helper: %s" % err)
572 if stat.S_ISREG(st.st_mode):
573 if stat.S_IMODE(st.st_mode) & stat.S_IXUSR:
576 tmp.append("out of band helper %s is not executable" % path)
578 tmp.append("out of band helper %s is not a file" % path)
580 if constants.NV_LVLIST in what and vm_capable:
582 val = GetVolumeList(utils.ListVolumeGroups().keys())
585 result[constants.NV_LVLIST] = val
587 if constants.NV_INSTANCELIST in what and vm_capable:
588 # GetInstanceList can fail
590 val = GetInstanceList(what[constants.NV_INSTANCELIST])
593 result[constants.NV_INSTANCELIST] = val
595 if constants.NV_VGLIST in what and vm_capable:
596 result[constants.NV_VGLIST] = utils.ListVolumeGroups()
598 if constants.NV_PVLIST in what and vm_capable:
599 result[constants.NV_PVLIST] = \
600 bdev.LogicalVolume.GetPVInfo(what[constants.NV_PVLIST],
601 filter_allocatable=False)
603 if constants.NV_VERSION in what:
604 result[constants.NV_VERSION] = (constants.PROTOCOL_VERSION,
605 constants.RELEASE_VERSION)
607 if constants.NV_HVINFO in what and vm_capable:
608 hyper = hypervisor.GetHypervisor(what[constants.NV_HVINFO])
609 result[constants.NV_HVINFO] = hyper.GetNodeInfo()
611 if constants.NV_DRBDLIST in what and vm_capable:
613 used_minors = bdev.DRBD8.GetUsedDevs().keys()
614 except errors.BlockDeviceError, err:
615 logging.warning("Can't get used minors list", exc_info=True)
616 used_minors = str(err)
617 result[constants.NV_DRBDLIST] = used_minors
619 if constants.NV_DRBDHELPER in what and vm_capable:
622 payload = bdev.BaseDRBD.GetUsermodeHelper()
623 except errors.BlockDeviceError, err:
624 logging.error("Can't get DRBD usermode helper: %s", str(err))
627 result[constants.NV_DRBDHELPER] = (status, payload)
629 if constants.NV_NODESETUP in what:
630 result[constants.NV_NODESETUP] = tmpr = []
631 if not os.path.isdir("/sys/block") or not os.path.isdir("/sys/class/net"):
632 tmpr.append("The sysfs filesytem doesn't seem to be mounted"
633 " under /sys, missing required directories /sys/block"
634 " and /sys/class/net")
635 if (not os.path.isdir("/proc/sys") or
636 not os.path.isfile("/proc/sysrq-trigger")):
637 tmpr.append("The procfs filesystem doesn't seem to be mounted"
638 " under /proc, missing required directory /proc/sys and"
639 " the file /proc/sysrq-trigger")
641 if constants.NV_TIME in what:
642 result[constants.NV_TIME] = utils.SplitTime(time.time())
644 if constants.NV_OSLIST in what and vm_capable:
645 result[constants.NV_OSLIST] = DiagnoseOS()
647 if constants.NV_BRIDGES in what and vm_capable:
648 result[constants.NV_BRIDGES] = [bridge
649 for bridge in what[constants.NV_BRIDGES]
650 if not utils.BridgeExists(bridge)]
654 def GetVolumeList(vg_names):
655 """Compute list of logical volumes and their size.
658 @param vg_names: the volume groups whose LVs we should list, or
659 empty for all volume groups
662 dictionary of all partions (key) with value being a tuple of
663 their size (in MiB), inactive and online status::
665 {'xenvg/test1': ('20.06', True, True)}
667 in case of errors, a string is returned with the error
675 result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
676 "--separator=%s" % sep,
677 "-ovg_name,lv_name,lv_size,lv_attr"] + vg_names)
679 _Fail("Failed to list logical volumes, lvs output: %s", result.output)
681 for line in result.stdout.splitlines():
683 match = _LVSLINE_REGEX.match(line)
685 logging.error("Invalid line returned from lvs output: '%s'", line)
687 vg_name, name, size, attr = match.groups()
688 inactive = attr[4] == '-'
689 online = attr[5] == 'o'
690 virtual = attr[0] == 'v'
692 # we don't want to report such volumes as existing, since they
693 # don't really hold data
695 lvs[vg_name+"/"+name] = (size, inactive, online)
700 def ListVolumeGroups():
701 """List the volume groups and their size.
704 @return: dictionary with keys volume name and values the
708 return utils.ListVolumeGroups()
712 """List all volumes on this node.
716 A list of dictionaries, each having four keys:
717 - name: the logical volume name,
718 - size: the size of the logical volume
719 - dev: the physical device on which the LV lives
720 - vg: the volume group to which it belongs
722 In case of errors, we return an empty list and log the
725 Note that since a logical volume can live on multiple physical
726 volumes, the resulting list might include a logical volume
730 result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
732 "--options=lv_name,lv_size,devices,vg_name"])
734 _Fail("Failed to list logical volumes, lvs output: %s",
738 return dev.split('(')[0]
741 return [parse_dev(x) for x in dev.split(",")]
744 line = [v.strip() for v in line]
745 return [{'name': line[0], 'size': line[1],
746 'dev': dev, 'vg': line[3]} for dev in handle_dev(line[2])]
749 for line in result.stdout.splitlines():
750 if line.count('|') >= 3:
751 all_devs.extend(map_line(line.split('|')))
753 logging.warning("Strange line in the output from lvs: '%s'", line)
757 def BridgesExist(bridges_list):
758 """Check if a list of bridges exist on the current node.
761 @return: C{True} if all of them exist, C{False} otherwise
765 for bridge in bridges_list:
766 if not utils.BridgeExists(bridge):
767 missing.append(bridge)
770 _Fail("Missing bridges %s", utils.CommaJoin(missing))
773 def GetInstanceList(hypervisor_list):
774 """Provides a list of instances.
776 @type hypervisor_list: list
777 @param hypervisor_list: the list of hypervisors to query information
780 @return: a list of all running instances on the current node
781 - instance1.example.com
782 - instance2.example.com
786 for hname in hypervisor_list:
788 names = hypervisor.GetHypervisor(hname).ListInstances()
789 results.extend(names)
790 except errors.HypervisorError, err:
791 _Fail("Error enumerating instances (hypervisor %s): %s",
792 hname, err, exc=True)
797 def GetInstanceInfo(instance, hname):
798 """Gives back the information about an instance as a dictionary.
800 @type instance: string
801 @param instance: the instance name
803 @param hname: the hypervisor type of the instance
806 @return: dictionary with the following keys:
807 - memory: memory size of instance (int)
808 - state: xen state of instance (string)
809 - time: cpu time of instance (float)
814 iinfo = hypervisor.GetHypervisor(hname).GetInstanceInfo(instance)
815 if iinfo is not None:
816 output['memory'] = iinfo[2]
817 output['state'] = iinfo[4]
818 output['time'] = iinfo[5]
823 def GetInstanceMigratable(instance):
824 """Gives whether an instance can be migrated.
826 @type instance: L{objects.Instance}
827 @param instance: object representing the instance to be checked.
830 @return: tuple of (result, description) where:
831 - result: whether the instance can be migrated or not
832 - description: a description of the issue, if relevant
835 hyper = hypervisor.GetHypervisor(instance.hypervisor)
836 iname = instance.name
837 if iname not in hyper.ListInstances():
838 _Fail("Instance %s is not running", iname)
840 for idx in range(len(instance.disks)):
841 link_name = _GetBlockDevSymlinkPath(iname, idx)
842 if not os.path.islink(link_name):
843 logging.warning("Instance %s is missing symlink %s for disk %d",
844 iname, link_name, idx)
847 def GetAllInstancesInfo(hypervisor_list):
848 """Gather data about all instances.
850 This is the equivalent of L{GetInstanceInfo}, except that it
851 computes data for all instances at once, thus being faster if one
852 needs data about more than one instance.
854 @type hypervisor_list: list
855 @param hypervisor_list: list of hypervisors to query for instance data
858 @return: dictionary of instance: data, with data having the following keys:
859 - memory: memory size of instance (int)
860 - state: xen state of instance (string)
861 - time: cpu time of instance (float)
862 - vcpus: the number of vcpus
867 for hname in hypervisor_list:
868 iinfo = hypervisor.GetHypervisor(hname).GetAllInstancesInfo()
870 for name, _, memory, vcpus, state, times in iinfo:
878 # we only check static parameters, like memory and vcpus,
879 # and not state and time which can change between the
880 # invocations of the different hypervisors
881 for key in 'memory', 'vcpus':
882 if value[key] != output[name][key]:
883 _Fail("Instance %s is running twice"
884 " with different parameters", name)
890 def _InstanceLogName(kind, os_name, instance):
891 """Compute the OS log filename for a given instance and operation.
893 The instance name and os name are passed in as strings since not all
894 operations have these as part of an instance object.
897 @param kind: the operation type (e.g. add, import, etc.)
898 @type os_name: string
899 @param os_name: the os name
900 @type instance: string
901 @param instance: the name of the instance being imported/added/etc.
904 # TODO: Use tempfile.mkstemp to create unique filename
905 base = ("%s-%s-%s-%s.log" %
906 (kind, os_name, instance, utils.TimestampForFilename()))
907 return utils.PathJoin(constants.LOG_OS_DIR, base)
910 def InstanceOsAdd(instance, reinstall, debug):
911 """Add an OS to an instance.
913 @type instance: L{objects.Instance}
914 @param instance: Instance whose OS is to be installed
915 @type reinstall: boolean
916 @param reinstall: whether this is an instance reinstall
918 @param debug: debug level, passed to the OS scripts
922 inst_os = OSFromDisk(instance.os)
924 create_env = OSEnvironment(instance, inst_os, debug)
926 create_env['INSTANCE_REINSTALL'] = "1"
928 logfile = _InstanceLogName("add", instance.os, instance.name)
930 result = utils.RunCmd([inst_os.create_script], env=create_env,
931 cwd=inst_os.path, output=logfile,)
933 logging.error("os create command '%s' returned error: %s, logfile: %s,"
934 " output: %s", result.cmd, result.fail_reason, logfile,
936 lines = [utils.SafeEncode(val)
937 for val in utils.TailFile(logfile, lines=20)]
938 _Fail("OS create script failed (%s), last lines in the"
939 " log file:\n%s", result.fail_reason, "\n".join(lines), log=False)
942 def RunRenameInstance(instance, old_name, debug):
943 """Run the OS rename script for an instance.
945 @type instance: L{objects.Instance}
946 @param instance: Instance whose OS is to be installed
947 @type old_name: string
948 @param old_name: previous instance name
950 @param debug: debug level, passed to the OS scripts
952 @return: the success of the operation
955 inst_os = OSFromDisk(instance.os)
957 rename_env = OSEnvironment(instance, inst_os, debug)
958 rename_env['OLD_INSTANCE_NAME'] = old_name
960 logfile = _InstanceLogName("rename", instance.os,
961 "%s-%s" % (old_name, instance.name))
963 result = utils.RunCmd([inst_os.rename_script], env=rename_env,
964 cwd=inst_os.path, output=logfile)
967 logging.error("os create command '%s' returned error: %s output: %s",
968 result.cmd, result.fail_reason, result.output)
969 lines = [utils.SafeEncode(val)
970 for val in utils.TailFile(logfile, lines=20)]
971 _Fail("OS rename script failed (%s), last lines in the"
972 " log file:\n%s", result.fail_reason, "\n".join(lines), log=False)
975 def _GetBlockDevSymlinkPath(instance_name, idx):
976 return utils.PathJoin(constants.DISK_LINKS_DIR, "%s%s%d" %
977 (instance_name, constants.DISK_SEPARATOR, idx))
980 def _SymlinkBlockDev(instance_name, device_path, idx):
981 """Set up symlinks to a instance's block device.
983 This is an auxiliary function run when an instance is start (on the primary
984 node) or when an instance is migrated (on the target node).
987 @param instance_name: the name of the target instance
988 @param device_path: path of the physical block device, on the node
989 @param idx: the disk index
990 @return: absolute path to the disk's symlink
993 link_name = _GetBlockDevSymlinkPath(instance_name, idx)
995 os.symlink(device_path, link_name)
997 if err.errno == errno.EEXIST:
998 if (not os.path.islink(link_name) or
999 os.readlink(link_name) != device_path):
1000 os.remove(link_name)
1001 os.symlink(device_path, link_name)
1008 def _RemoveBlockDevLinks(instance_name, disks):
1009 """Remove the block device symlinks belonging to the given instance.
1012 for idx, _ in enumerate(disks):
1013 link_name = _GetBlockDevSymlinkPath(instance_name, idx)
1014 if os.path.islink(link_name):
1016 os.remove(link_name)
1018 logging.exception("Can't remove symlink '%s'", link_name)
1021 def _GatherAndLinkBlockDevs(instance):
1022 """Set up an instance's block device(s).
1024 This is run on the primary node at instance startup. The block
1025 devices must be already assembled.
1027 @type instance: L{objects.Instance}
1028 @param instance: the instance whose disks we shoul assemble
1030 @return: list of (disk_object, device_path)
1034 for idx, disk in enumerate(instance.disks):
1035 device = _RecursiveFindBD(disk)
1037 raise errors.BlockDeviceError("Block device '%s' is not set up." %
1041 link_name = _SymlinkBlockDev(instance.name, device.dev_path, idx)
1043 raise errors.BlockDeviceError("Cannot create block device symlink: %s" %
1046 block_devices.append((disk, link_name))
1048 return block_devices
1051 def StartInstance(instance):
1052 """Start an instance.
1054 @type instance: L{objects.Instance}
1055 @param instance: the instance object
1059 running_instances = GetInstanceList([instance.hypervisor])
1061 if instance.name in running_instances:
1062 logging.info("Instance %s already running, not starting", instance.name)
1066 block_devices = _GatherAndLinkBlockDevs(instance)
1067 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1068 hyper.StartInstance(instance, block_devices)
1069 except errors.BlockDeviceError, err:
1070 _Fail("Block device error: %s", err, exc=True)
1071 except errors.HypervisorError, err:
1072 _RemoveBlockDevLinks(instance.name, instance.disks)
1073 _Fail("Hypervisor error: %s", err, exc=True)
1076 def InstanceShutdown(instance, timeout):
1077 """Shut an instance down.
1079 @note: this functions uses polling with a hardcoded timeout.
1081 @type instance: L{objects.Instance}
1082 @param instance: the instance object
1083 @type timeout: integer
1084 @param timeout: maximum timeout for soft shutdown
1088 hv_name = instance.hypervisor
1089 hyper = hypervisor.GetHypervisor(hv_name)
1090 iname = instance.name
1092 if instance.name not in hyper.ListInstances():
1093 logging.info("Instance %s not running, doing nothing", iname)
1098 self.tried_once = False
1101 if iname not in hyper.ListInstances():
1105 hyper.StopInstance(instance, retry=self.tried_once)
1106 except errors.HypervisorError, err:
1107 if iname not in hyper.ListInstances():
1108 # if the instance is no longer existing, consider this a
1109 # success and go to cleanup
1112 _Fail("Failed to stop instance %s: %s", iname, err)
1114 self.tried_once = True
1116 raise utils.RetryAgain()
1119 utils.Retry(_TryShutdown(), 5, timeout)
1120 except utils.RetryTimeout:
1121 # the shutdown did not succeed
1122 logging.error("Shutdown of '%s' unsuccessful, forcing", iname)
1125 hyper.StopInstance(instance, force=True)
1126 except errors.HypervisorError, err:
1127 if iname in hyper.ListInstances():
1128 # only raise an error if the instance still exists, otherwise
1129 # the error could simply be "instance ... unknown"!
1130 _Fail("Failed to force stop instance %s: %s", iname, err)
1134 if iname in hyper.ListInstances():
1135 _Fail("Could not shutdown instance %s even by destroy", iname)
1138 hyper.CleanupInstance(instance.name)
1139 except errors.HypervisorError, err:
1140 logging.warning("Failed to execute post-shutdown cleanup step: %s", err)
1142 _RemoveBlockDevLinks(iname, instance.disks)
1145 def InstanceReboot(instance, reboot_type, shutdown_timeout):
1146 """Reboot an instance.
1148 @type instance: L{objects.Instance}
1149 @param instance: the instance object to reboot
1150 @type reboot_type: str
1151 @param reboot_type: the type of reboot, one the following
1153 - L{constants.INSTANCE_REBOOT_SOFT}: only reboot the
1154 instance OS, do not recreate the VM
1155 - L{constants.INSTANCE_REBOOT_HARD}: tear down and
1156 restart the VM (at the hypervisor level)
1157 - the other reboot type (L{constants.INSTANCE_REBOOT_FULL}) is
1158 not accepted here, since that mode is handled differently, in
1159 cmdlib, and translates into full stop and start of the
1160 instance (instead of a call_instance_reboot RPC)
1161 @type shutdown_timeout: integer
1162 @param shutdown_timeout: maximum timeout for soft shutdown
1166 running_instances = GetInstanceList([instance.hypervisor])
1168 if instance.name not in running_instances:
1169 _Fail("Cannot reboot instance %s that is not running", instance.name)
1171 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1172 if reboot_type == constants.INSTANCE_REBOOT_SOFT:
1174 hyper.RebootInstance(instance)
1175 except errors.HypervisorError, err:
1176 _Fail("Failed to soft reboot instance %s: %s", instance.name, err)
1177 elif reboot_type == constants.INSTANCE_REBOOT_HARD:
1179 InstanceShutdown(instance, shutdown_timeout)
1180 return StartInstance(instance)
1181 except errors.HypervisorError, err:
1182 _Fail("Failed to hard reboot instance %s: %s", instance.name, err)
1184 _Fail("Invalid reboot_type received: %s", reboot_type)
1187 def MigrationInfo(instance):
1188 """Gather information about an instance to be migrated.
1190 @type instance: L{objects.Instance}
1191 @param instance: the instance definition
1194 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1196 info = hyper.MigrationInfo(instance)
1197 except errors.HypervisorError, err:
1198 _Fail("Failed to fetch migration information: %s", err, exc=True)
1202 def AcceptInstance(instance, info, target):
1203 """Prepare the node to accept an instance.
1205 @type instance: L{objects.Instance}
1206 @param instance: the instance definition
1207 @type info: string/data (opaque)
1208 @param info: migration information, from the source node
1209 @type target: string
1210 @param target: target host (usually ip), on this node
1213 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1215 hyper.AcceptInstance(instance, info, target)
1216 except errors.HypervisorError, err:
1217 _Fail("Failed to accept instance: %s", err, exc=True)
1220 def FinalizeMigration(instance, info, success):
1221 """Finalize any preparation to accept an instance.
1223 @type instance: L{objects.Instance}
1224 @param instance: the instance definition
1225 @type info: string/data (opaque)
1226 @param info: migration information, from the source node
1227 @type success: boolean
1228 @param success: whether the migration was a success or a failure
1231 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1233 hyper.FinalizeMigration(instance, info, success)
1234 except errors.HypervisorError, err:
1235 _Fail("Failed to finalize migration: %s", err, exc=True)
1238 def MigrateInstance(instance, target, live):
1239 """Migrates an instance to another node.
1241 @type instance: L{objects.Instance}
1242 @param instance: the instance definition
1243 @type target: string
1244 @param target: the target node name
1246 @param live: whether the migration should be done live or not (the
1247 interpretation of this parameter is left to the hypervisor)
1249 @return: a tuple of (success, msg) where:
1250 - succes is a boolean denoting the success/failure of the operation
1251 - msg is a string with details in case of failure
1254 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1257 hyper.MigrateInstance(instance, target, live)
1258 except errors.HypervisorError, err:
1259 _Fail("Failed to migrate instance: %s", err, exc=True)
1262 def BlockdevCreate(disk, size, owner, on_primary, info):
1263 """Creates a block device for an instance.
1265 @type disk: L{objects.Disk}
1266 @param disk: the object describing the disk we should create
1268 @param size: the size of the physical underlying device, in MiB
1270 @param owner: the name of the instance for which disk is created,
1271 used for device cache data
1272 @type on_primary: boolean
1273 @param on_primary: indicates if it is the primary node or not
1275 @param info: string that will be sent to the physical device
1276 creation, used for example to set (LVM) tags on LVs
1278 @return: the new unique_id of the device (this can sometime be
1279 computed only after creation), or None. On secondary nodes,
1280 it's not required to return anything.
1283 # TODO: remove the obsolete 'size' argument
1284 # pylint: disable-msg=W0613
1287 for child in disk.children:
1289 crdev = _RecursiveAssembleBD(child, owner, on_primary)
1290 except errors.BlockDeviceError, err:
1291 _Fail("Can't assemble device %s: %s", child, err)
1292 if on_primary or disk.AssembleOnSecondary():
1293 # we need the children open in case the device itself has to
1296 # pylint: disable-msg=E1103
1298 except errors.BlockDeviceError, err:
1299 _Fail("Can't make child '%s' read-write: %s", child, err)
1303 device = bdev.Create(disk.dev_type, disk.physical_id, clist, disk.size)
1304 except errors.BlockDeviceError, err:
1305 _Fail("Can't create block device: %s", err)
1307 if on_primary or disk.AssembleOnSecondary():
1310 except errors.BlockDeviceError, err:
1311 _Fail("Can't assemble device after creation, unusual event: %s", err)
1312 device.SetSyncSpeed(constants.SYNC_SPEED)
1313 if on_primary or disk.OpenOnSecondary():
1315 device.Open(force=True)
1316 except errors.BlockDeviceError, err:
1317 _Fail("Can't make device r/w after creation, unusual event: %s", err)
1318 DevCacheManager.UpdateCache(device.dev_path, owner,
1319 on_primary, disk.iv_name)
1321 device.SetInfo(info)
1323 return device.unique_id
1326 def _WipeDevice(path, offset, size):
1327 """This function actually wipes the device.
1329 @param path: The path to the device to wipe
1330 @param offset: The offset in MiB in the file
1331 @param size: The size in MiB to write
1334 cmd = [constants.DD_CMD, "if=/dev/zero", "seek=%d" % offset,
1335 "bs=%d" % constants.WIPE_BLOCK_SIZE, "oflag=direct", "of=%s" % path,
1337 result = utils.RunCmd(cmd)
1340 _Fail("Wipe command '%s' exited with error: %s; output: %s", result.cmd,
1341 result.fail_reason, result.output)
1344 def BlockdevWipe(disk, offset, size):
1345 """Wipes a block device.
1347 @type disk: L{objects.Disk}
1348 @param disk: the disk object we want to wipe
1350 @param offset: The offset in MiB in the file
1352 @param size: The size in MiB to write
1356 rdev = _RecursiveFindBD(disk)
1357 except errors.BlockDeviceError:
1361 _Fail("Cannot execute wipe for device %s: device not found", disk.iv_name)
1363 # Do cross verify some of the parameters
1364 if offset > rdev.size:
1365 _Fail("Offset is bigger than device size")
1366 if (offset + size) > rdev.size:
1367 _Fail("The provided offset and size to wipe is bigger than device size")
1369 _WipeDevice(rdev.dev_path, offset, size)
1372 def BlockdevPauseResumeSync(disks, pause):
1373 """Pause or resume the sync of the block device.
1375 @type disks: list of L{objects.Disk}
1376 @param disks: the disks object we want to pause/resume
1378 @param pause: Wheater to pause or resume
1384 rdev = _RecursiveFindBD(disk)
1385 except errors.BlockDeviceError:
1389 success.append((False, ("Cannot change sync for device %s:"
1390 " device not found" % disk.iv_name)))
1393 result = rdev.PauseResumeSync(pause)
1396 success.append((result, None))
1402 success.append((result, "%s for device %s failed" % (msg, disk.iv_name)))
1407 def BlockdevRemove(disk):
1408 """Remove a block device.
1410 @note: This is intended to be called recursively.
1412 @type disk: L{objects.Disk}
1413 @param disk: the disk object we should remove
1415 @return: the success of the operation
1420 rdev = _RecursiveFindBD(disk)
1421 except errors.BlockDeviceError, err:
1422 # probably can't attach
1423 logging.info("Can't attach to device %s in remove", disk)
1425 if rdev is not None:
1426 r_path = rdev.dev_path
1429 except errors.BlockDeviceError, err:
1430 msgs.append(str(err))
1432 DevCacheManager.RemoveCache(r_path)
1435 for child in disk.children:
1437 BlockdevRemove(child)
1438 except RPCFail, err:
1439 msgs.append(str(err))
1442 _Fail("; ".join(msgs))
1445 def _RecursiveAssembleBD(disk, owner, as_primary):
1446 """Activate a block device for an instance.
1448 This is run on the primary and secondary nodes for an instance.
1450 @note: this function is called recursively.
1452 @type disk: L{objects.Disk}
1453 @param disk: the disk we try to assemble
1455 @param owner: the name of the instance which owns the disk
1456 @type as_primary: boolean
1457 @param as_primary: if we should make the block device
1460 @return: the assembled device or None (in case no device
1462 @raise errors.BlockDeviceError: in case there is an error
1463 during the activation of the children or the device
1469 mcn = disk.ChildrenNeeded()
1471 mcn = 0 # max number of Nones allowed
1473 mcn = len(disk.children) - mcn # max number of Nones
1474 for chld_disk in disk.children:
1476 cdev = _RecursiveAssembleBD(chld_disk, owner, as_primary)
1477 except errors.BlockDeviceError, err:
1478 if children.count(None) >= mcn:
1481 logging.error("Error in child activation (but continuing): %s",
1483 children.append(cdev)
1485 if as_primary or disk.AssembleOnSecondary():
1486 r_dev = bdev.Assemble(disk.dev_type, disk.physical_id, children, disk.size)
1487 r_dev.SetSyncSpeed(constants.SYNC_SPEED)
1489 if as_primary or disk.OpenOnSecondary():
1491 DevCacheManager.UpdateCache(r_dev.dev_path, owner,
1492 as_primary, disk.iv_name)
1499 def BlockdevAssemble(disk, owner, as_primary, idx):
1500 """Activate a block device for an instance.
1502 This is a wrapper over _RecursiveAssembleBD.
1504 @rtype: str or boolean
1505 @return: a C{/dev/...} path for primary nodes, and
1506 C{True} for secondary nodes
1510 result = _RecursiveAssembleBD(disk, owner, as_primary)
1511 if isinstance(result, bdev.BlockDev):
1512 # pylint: disable-msg=E1103
1513 result = result.dev_path
1515 _SymlinkBlockDev(owner, result, idx)
1516 except errors.BlockDeviceError, err:
1517 _Fail("Error while assembling disk: %s", err, exc=True)
1518 except OSError, err:
1519 _Fail("Error while symlinking disk: %s", err, exc=True)
1524 def BlockdevShutdown(disk):
1525 """Shut down a block device.
1527 First, if the device is assembled (Attach() is successful), then
1528 the device is shutdown. Then the children of the device are
1531 This function is called recursively. Note that we don't cache the
1532 children or such, as oppossed to assemble, shutdown of different
1533 devices doesn't require that the upper device was active.
1535 @type disk: L{objects.Disk}
1536 @param disk: the description of the disk we should
1542 r_dev = _RecursiveFindBD(disk)
1543 if r_dev is not None:
1544 r_path = r_dev.dev_path
1547 DevCacheManager.RemoveCache(r_path)
1548 except errors.BlockDeviceError, err:
1549 msgs.append(str(err))
1552 for child in disk.children:
1554 BlockdevShutdown(child)
1555 except RPCFail, err:
1556 msgs.append(str(err))
1559 _Fail("; ".join(msgs))
1562 def BlockdevAddchildren(parent_cdev, new_cdevs):
1563 """Extend a mirrored block device.
1565 @type parent_cdev: L{objects.Disk}
1566 @param parent_cdev: the disk to which we should add children
1567 @type new_cdevs: list of L{objects.Disk}
1568 @param new_cdevs: the list of children which we should add
1572 parent_bdev = _RecursiveFindBD(parent_cdev)
1573 if parent_bdev is None:
1574 _Fail("Can't find parent device '%s' in add children", parent_cdev)
1575 new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs]
1576 if new_bdevs.count(None) > 0:
1577 _Fail("Can't find new device(s) to add: %s:%s", new_bdevs, new_cdevs)
1578 parent_bdev.AddChildren(new_bdevs)
1581 def BlockdevRemovechildren(parent_cdev, new_cdevs):
1582 """Shrink a mirrored block device.
1584 @type parent_cdev: L{objects.Disk}
1585 @param parent_cdev: the disk from which we should remove children
1586 @type new_cdevs: list of L{objects.Disk}
1587 @param new_cdevs: the list of children which we should remove
1591 parent_bdev = _RecursiveFindBD(parent_cdev)
1592 if parent_bdev is None:
1593 _Fail("Can't find parent device '%s' in remove children", parent_cdev)
1595 for disk in new_cdevs:
1596 rpath = disk.StaticDevPath()
1598 bd = _RecursiveFindBD(disk)
1600 _Fail("Can't find device %s while removing children", disk)
1602 devs.append(bd.dev_path)
1604 if not utils.IsNormAbsPath(rpath):
1605 _Fail("Strange path returned from StaticDevPath: '%s'", rpath)
1607 parent_bdev.RemoveChildren(devs)
1610 def BlockdevGetmirrorstatus(disks):
1611 """Get the mirroring status of a list of devices.
1613 @type disks: list of L{objects.Disk}
1614 @param disks: the list of disks which we should query
1616 @return: List of L{objects.BlockDevStatus}, one for each disk
1617 @raise errors.BlockDeviceError: if any of the disks cannot be
1623 rbd = _RecursiveFindBD(dsk)
1625 _Fail("Can't find device %s", dsk)
1627 stats.append(rbd.CombinedSyncStatus())
1632 def BlockdevGetmirrorstatusMulti(disks):
1633 """Get the mirroring status of a list of devices.
1635 @type disks: list of L{objects.Disk}
1636 @param disks: the list of disks which we should query
1638 @return: List of tuples, (bool, status), one for each disk; bool denotes
1639 success/failure, status is L{objects.BlockDevStatus} on success, string
1646 rbd = _RecursiveFindBD(disk)
1648 result.append((False, "Can't find device %s" % disk))
1651 status = rbd.CombinedSyncStatus()
1652 except errors.BlockDeviceError, err:
1653 logging.exception("Error while getting disk status")
1654 result.append((False, str(err)))
1656 result.append((True, status))
1658 assert len(disks) == len(result)
1663 def _RecursiveFindBD(disk):
1664 """Check if a device is activated.
1666 If so, return information about the real device.
1668 @type disk: L{objects.Disk}
1669 @param disk: the disk object we need to find
1671 @return: None if the device can't be found,
1672 otherwise the device instance
1677 for chdisk in disk.children:
1678 children.append(_RecursiveFindBD(chdisk))
1680 return bdev.FindDevice(disk.dev_type, disk.physical_id, children, disk.size)
1683 def _OpenRealBD(disk):
1684 """Opens the underlying block device of a disk.
1686 @type disk: L{objects.Disk}
1687 @param disk: the disk object we want to open
1690 real_disk = _RecursiveFindBD(disk)
1691 if real_disk is None:
1692 _Fail("Block device '%s' is not set up", disk)
1699 def BlockdevFind(disk):
1700 """Check if a device is activated.
1702 If it is, return information about the real device.
1704 @type disk: L{objects.Disk}
1705 @param disk: the disk to find
1706 @rtype: None or objects.BlockDevStatus
1707 @return: None if the disk cannot be found, otherwise a the current
1712 rbd = _RecursiveFindBD(disk)
1713 except errors.BlockDeviceError, err:
1714 _Fail("Failed to find device: %s", err, exc=True)
1719 return rbd.GetSyncStatus()
1722 def BlockdevGetsize(disks):
1723 """Computes the size of the given disks.
1725 If a disk is not found, returns None instead.
1727 @type disks: list of L{objects.Disk}
1728 @param disks: the list of disk to compute the size for
1730 @return: list with elements None if the disk cannot be found,
1737 rbd = _RecursiveFindBD(cf)
1738 except errors.BlockDeviceError:
1744 result.append(rbd.GetActualSize())
1748 def BlockdevExport(disk, dest_node, dest_path, cluster_name):
1749 """Export a block device to a remote node.
1751 @type disk: L{objects.Disk}
1752 @param disk: the description of the disk to export
1753 @type dest_node: str
1754 @param dest_node: the destination node to export to
1755 @type dest_path: str
1756 @param dest_path: the destination path on the target node
1757 @type cluster_name: str
1758 @param cluster_name: the cluster name, needed for SSH hostalias
1762 real_disk = _OpenRealBD(disk)
1764 # the block size on the read dd is 1MiB to match our units
1765 expcmd = utils.BuildShellCmd("set -e; set -o pipefail; "
1766 "dd if=%s bs=1048576 count=%s",
1767 real_disk.dev_path, str(disk.size))
1769 # we set here a smaller block size as, due to ssh buffering, more
1770 # than 64-128k will mostly ignored; we use nocreat to fail if the
1771 # device is not already there or we pass a wrong path; we use
1772 # notrunc to no attempt truncate on an LV device; we use oflag=dsync
1773 # to not buffer too much memory; this means that at best, we flush
1774 # every 64k, which will not be very fast
1775 destcmd = utils.BuildShellCmd("dd of=%s conv=nocreat,notrunc bs=65536"
1776 " oflag=dsync", dest_path)
1778 remotecmd = _GetSshRunner(cluster_name).BuildCmd(dest_node,
1779 constants.GANETI_RUNAS,
1782 # all commands have been checked, so we're safe to combine them
1783 command = '|'.join([expcmd, utils.ShellQuoteArgs(remotecmd)])
1785 result = utils.RunCmd(["bash", "-c", command])
1788 _Fail("Disk copy command '%s' returned error: %s"
1789 " output: %s", command, result.fail_reason, result.output)
1792 def UploadFile(file_name, data, mode, uid, gid, atime, mtime):
1793 """Write a file to the filesystem.
1795 This allows the master to overwrite(!) a file. It will only perform
1796 the operation if the file belongs to a list of configuration files.
1798 @type file_name: str
1799 @param file_name: the target file name
1801 @param data: the new contents of the file
1803 @param mode: the mode to give the file (can be None)
1805 @param uid: the owner of the file (can be -1 for default)
1807 @param gid: the group of the file (can be -1 for default)
1809 @param atime: the atime to set on the file (can be None)
1811 @param mtime: the mtime to set on the file (can be None)
1815 if not os.path.isabs(file_name):
1816 _Fail("Filename passed to UploadFile is not absolute: '%s'", file_name)
1818 if file_name not in _ALLOWED_UPLOAD_FILES:
1819 _Fail("Filename passed to UploadFile not in allowed upload targets: '%s'",
1822 raw_data = _Decompress(data)
1824 utils.SafeWriteFile(file_name, None,
1825 data=raw_data, mode=mode, uid=uid, gid=gid,
1826 atime=atime, mtime=mtime)
1829 def RunOob(oob_program, command, node, timeout):
1830 """Executes oob_program with given command on given node.
1832 @param oob_program: The path to the executable oob_program
1833 @param command: The command to invoke on oob_program
1834 @param node: The node given as an argument to the program
1835 @param timeout: Timeout after which we kill the oob program
1838 @raise RPCFail: If execution fails for some reason
1841 result = utils.RunCmd([oob_program, command, node], timeout=timeout)
1844 _Fail("'%s' failed with reason '%s'; output: %s", result.cmd,
1845 result.fail_reason, result.output)
1847 return result.stdout
1850 def WriteSsconfFiles(values):
1851 """Update all ssconf files.
1853 Wrapper around the SimpleStore.WriteFiles.
1856 ssconf.SimpleStore().WriteFiles(values)
1859 def _ErrnoOrStr(err):
1860 """Format an EnvironmentError exception.
1862 If the L{err} argument has an errno attribute, it will be looked up
1863 and converted into a textual C{E...} description. Otherwise the
1864 string representation of the error will be returned.
1866 @type err: L{EnvironmentError}
1867 @param err: the exception to format
1870 if hasattr(err, 'errno'):
1871 detail = errno.errorcode[err.errno]
1877 def _OSOndiskAPIVersion(os_dir):
1878 """Compute and return the API version of a given OS.
1880 This function will try to read the API version of the OS residing in
1881 the 'os_dir' directory.
1884 @param os_dir: the directory in which we should look for the OS
1886 @return: tuple (status, data) with status denoting the validity and
1887 data holding either the vaid versions or an error message
1890 api_file = utils.PathJoin(os_dir, constants.OS_API_FILE)
1893 st = os.stat(api_file)
1894 except EnvironmentError, err:
1895 return False, ("Required file '%s' not found under path %s: %s" %
1896 (constants.OS_API_FILE, os_dir, _ErrnoOrStr(err)))
1898 if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
1899 return False, ("File '%s' in %s is not a regular file" %
1900 (constants.OS_API_FILE, os_dir))
1903 api_versions = utils.ReadFile(api_file).splitlines()
1904 except EnvironmentError, err:
1905 return False, ("Error while reading the API version file at %s: %s" %
1906 (api_file, _ErrnoOrStr(err)))
1909 api_versions = [int(version.strip()) for version in api_versions]
1910 except (TypeError, ValueError), err:
1911 return False, ("API version(s) can't be converted to integer: %s" %
1914 return True, api_versions
1917 def DiagnoseOS(top_dirs=None):
1918 """Compute the validity for all OSes.
1920 @type top_dirs: list
1921 @param top_dirs: the list of directories in which to
1922 search (if not given defaults to
1923 L{constants.OS_SEARCH_PATH})
1924 @rtype: list of L{objects.OS}
1925 @return: a list of tuples (name, path, status, diagnose, variants,
1926 parameters, api_version) for all (potential) OSes under all
1927 search paths, where:
1928 - name is the (potential) OS name
1929 - path is the full path to the OS
1930 - status True/False is the validity of the OS
1931 - diagnose is the error message for an invalid OS, otherwise empty
1932 - variants is a list of supported OS variants, if any
1933 - parameters is a list of (name, help) parameters, if any
1934 - api_version is a list of support OS API versions
1937 if top_dirs is None:
1938 top_dirs = constants.OS_SEARCH_PATH
1941 for dir_name in top_dirs:
1942 if os.path.isdir(dir_name):
1944 f_names = utils.ListVisibleFiles(dir_name)
1945 except EnvironmentError, err:
1946 logging.exception("Can't list the OS directory %s: %s", dir_name, err)
1948 for name in f_names:
1949 os_path = utils.PathJoin(dir_name, name)
1950 status, os_inst = _TryOSFromDisk(name, base_dir=dir_name)
1953 variants = os_inst.supported_variants
1954 parameters = os_inst.supported_parameters
1955 api_versions = os_inst.api_versions
1958 variants = parameters = api_versions = []
1959 result.append((name, os_path, status, diagnose, variants,
1960 parameters, api_versions))
1965 def _TryOSFromDisk(name, base_dir=None):
1966 """Create an OS instance from disk.
1968 This function will return an OS instance if the given name is a
1971 @type base_dir: string
1972 @keyword base_dir: Base directory containing OS installations.
1973 Defaults to a search in all the OS_SEARCH_PATH dirs.
1975 @return: success and either the OS instance if we find a valid one,
1979 if base_dir is None:
1980 os_dir = utils.FindFile(name, constants.OS_SEARCH_PATH, os.path.isdir)
1982 os_dir = utils.FindFile(name, [base_dir], os.path.isdir)
1985 return False, "Directory for OS %s not found in search path" % name
1987 status, api_versions = _OSOndiskAPIVersion(os_dir)
1990 return status, api_versions
1992 if not constants.OS_API_VERSIONS.intersection(api_versions):
1993 return False, ("API version mismatch for path '%s': found %s, want %s." %
1994 (os_dir, api_versions, constants.OS_API_VERSIONS))
1996 # OS Files dictionary, we will populate it with the absolute path names
1997 os_files = dict.fromkeys(constants.OS_SCRIPTS)
1999 if max(api_versions) >= constants.OS_API_V15:
2000 os_files[constants.OS_VARIANTS_FILE] = ''
2002 if max(api_versions) >= constants.OS_API_V20:
2003 os_files[constants.OS_PARAMETERS_FILE] = ''
2005 del os_files[constants.OS_SCRIPT_VERIFY]
2007 for filename in os_files:
2008 os_files[filename] = utils.PathJoin(os_dir, filename)
2011 st = os.stat(os_files[filename])
2012 except EnvironmentError, err:
2013 return False, ("File '%s' under path '%s' is missing (%s)" %
2014 (filename, os_dir, _ErrnoOrStr(err)))
2016 if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
2017 return False, ("File '%s' under path '%s' is not a regular file" %
2020 if filename in constants.OS_SCRIPTS:
2021 if stat.S_IMODE(st.st_mode) & stat.S_IXUSR != stat.S_IXUSR:
2022 return False, ("File '%s' under path '%s' is not executable" %
2026 if constants.OS_VARIANTS_FILE in os_files:
2027 variants_file = os_files[constants.OS_VARIANTS_FILE]
2029 variants = utils.ReadFile(variants_file).splitlines()
2030 except EnvironmentError, err:
2031 return False, ("Error while reading the OS variants file at %s: %s" %
2032 (variants_file, _ErrnoOrStr(err)))
2034 return False, ("No supported os variant found")
2037 if constants.OS_PARAMETERS_FILE in os_files:
2038 parameters_file = os_files[constants.OS_PARAMETERS_FILE]
2040 parameters = utils.ReadFile(parameters_file).splitlines()
2041 except EnvironmentError, err:
2042 return False, ("Error while reading the OS parameters file at %s: %s" %
2043 (parameters_file, _ErrnoOrStr(err)))
2044 parameters = [v.split(None, 1) for v in parameters]
2046 os_obj = objects.OS(name=name, path=os_dir,
2047 create_script=os_files[constants.OS_SCRIPT_CREATE],
2048 export_script=os_files[constants.OS_SCRIPT_EXPORT],
2049 import_script=os_files[constants.OS_SCRIPT_IMPORT],
2050 rename_script=os_files[constants.OS_SCRIPT_RENAME],
2051 verify_script=os_files.get(constants.OS_SCRIPT_VERIFY,
2053 supported_variants=variants,
2054 supported_parameters=parameters,
2055 api_versions=api_versions)
2059 def OSFromDisk(name, base_dir=None):
2060 """Create an OS instance from disk.
2062 This function will return an OS instance if the given name is a
2063 valid OS name. Otherwise, it will raise an appropriate
2064 L{RPCFail} exception, detailing why this is not a valid OS.
2066 This is just a wrapper over L{_TryOSFromDisk}, which doesn't raise
2067 an exception but returns true/false status data.
2069 @type base_dir: string
2070 @keyword base_dir: Base directory containing OS installations.
2071 Defaults to a search in all the OS_SEARCH_PATH dirs.
2072 @rtype: L{objects.OS}
2073 @return: the OS instance if we find a valid one
2074 @raise RPCFail: if we don't find a valid OS
2077 name_only = objects.OS.GetName(name)
2078 status, payload = _TryOSFromDisk(name_only, base_dir)
2086 def OSCoreEnv(os_name, inst_os, os_params, debug=0):
2087 """Calculate the basic environment for an os script.
2090 @param os_name: full operating system name (including variant)
2091 @type inst_os: L{objects.OS}
2092 @param inst_os: operating system for which the environment is being built
2093 @type os_params: dict
2094 @param os_params: the OS parameters
2095 @type debug: integer
2096 @param debug: debug level (0 or 1, for OS Api 10)
2098 @return: dict of environment variables
2099 @raise errors.BlockDeviceError: if the block device
2105 max(constants.OS_API_VERSIONS.intersection(inst_os.api_versions))
2106 result['OS_API_VERSION'] = '%d' % api_version
2107 result['OS_NAME'] = inst_os.name
2108 result['DEBUG_LEVEL'] = '%d' % debug
2111 if api_version >= constants.OS_API_V15:
2112 variant = objects.OS.GetVariant(os_name)
2114 variant = inst_os.supported_variants[0]
2115 result['OS_VARIANT'] = variant
2118 for pname, pvalue in os_params.items():
2119 result['OSP_%s' % pname.upper()] = pvalue
2124 def OSEnvironment(instance, inst_os, debug=0):
2125 """Calculate the environment for an os script.
2127 @type instance: L{objects.Instance}
2128 @param instance: target instance for the os script run
2129 @type inst_os: L{objects.OS}
2130 @param inst_os: operating system for which the environment is being built
2131 @type debug: integer
2132 @param debug: debug level (0 or 1, for OS Api 10)
2134 @return: dict of environment variables
2135 @raise errors.BlockDeviceError: if the block device
2139 result = OSCoreEnv(instance.os, inst_os, instance.osparams, debug=debug)
2141 for attr in ["name", "os", "uuid", "ctime", "mtime", "primary_node"]:
2142 result["INSTANCE_%s" % attr.upper()] = str(getattr(instance, attr))
2144 result['HYPERVISOR'] = instance.hypervisor
2145 result['DISK_COUNT'] = '%d' % len(instance.disks)
2146 result['NIC_COUNT'] = '%d' % len(instance.nics)
2147 result['INSTANCE_SECONDARY_NODES'] = \
2148 ('%s' % " ".join(instance.secondary_nodes))
2151 for idx, disk in enumerate(instance.disks):
2152 real_disk = _OpenRealBD(disk)
2153 result['DISK_%d_PATH' % idx] = real_disk.dev_path
2154 result['DISK_%d_ACCESS' % idx] = disk.mode
2155 if constants.HV_DISK_TYPE in instance.hvparams:
2156 result['DISK_%d_FRONTEND_TYPE' % idx] = \
2157 instance.hvparams[constants.HV_DISK_TYPE]
2158 if disk.dev_type in constants.LDS_BLOCK:
2159 result['DISK_%d_BACKEND_TYPE' % idx] = 'block'
2160 elif disk.dev_type == constants.LD_FILE:
2161 result['DISK_%d_BACKEND_TYPE' % idx] = \
2162 'file:%s' % disk.physical_id[0]
2165 for idx, nic in enumerate(instance.nics):
2166 result['NIC_%d_MAC' % idx] = nic.mac
2168 result['NIC_%d_IP' % idx] = nic.ip
2169 result['NIC_%d_MODE' % idx] = nic.nicparams[constants.NIC_MODE]
2170 if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
2171 result['NIC_%d_BRIDGE' % idx] = nic.nicparams[constants.NIC_LINK]
2172 if nic.nicparams[constants.NIC_LINK]:
2173 result['NIC_%d_LINK' % idx] = nic.nicparams[constants.NIC_LINK]
2174 if constants.HV_NIC_TYPE in instance.hvparams:
2175 result['NIC_%d_FRONTEND_TYPE' % idx] = \
2176 instance.hvparams[constants.HV_NIC_TYPE]
2179 for source, kind in [(instance.beparams, "BE"), (instance.hvparams, "HV")]:
2180 for key, value in source.items():
2181 result["INSTANCE_%s_%s" % (kind, key)] = str(value)
2186 def BlockdevGrow(disk, amount):
2187 """Grow a stack of block devices.
2189 This function is called recursively, with the childrens being the
2190 first ones to resize.
2192 @type disk: L{objects.Disk}
2193 @param disk: the disk to be grown
2194 @rtype: (status, result)
2195 @return: a tuple with the status of the operation
2196 (True/False), and the errors message if status
2200 r_dev = _RecursiveFindBD(disk)
2202 _Fail("Cannot find block device %s", disk)
2206 except errors.BlockDeviceError, err:
2207 _Fail("Failed to grow block device: %s", err, exc=True)
2210 def BlockdevSnapshot(disk):
2211 """Create a snapshot copy of a block device.
2213 This function is called recursively, and the snapshot is actually created
2214 just for the leaf lvm backend device.
2216 @type disk: L{objects.Disk}
2217 @param disk: the disk to be snapshotted
2219 @return: snapshot disk ID as (vg, lv)
2222 if disk.dev_type == constants.LD_DRBD8:
2223 if not disk.children:
2224 _Fail("DRBD device '%s' without backing storage cannot be snapshotted",
2226 return BlockdevSnapshot(disk.children[0])
2227 elif disk.dev_type == constants.LD_LV:
2228 r_dev = _RecursiveFindBD(disk)
2229 if r_dev is not None:
2230 # FIXME: choose a saner value for the snapshot size
2231 # let's stay on the safe side and ask for the full size, for now
2232 return r_dev.Snapshot(disk.size)
2234 _Fail("Cannot find block device %s", disk)
2236 _Fail("Cannot snapshot non-lvm block device '%s' of type '%s'",
2237 disk.unique_id, disk.dev_type)
2240 def FinalizeExport(instance, snap_disks):
2241 """Write out the export configuration information.
2243 @type instance: L{objects.Instance}
2244 @param instance: the instance which we export, used for
2245 saving configuration
2246 @type snap_disks: list of L{objects.Disk}
2247 @param snap_disks: list of snapshot block devices, which
2248 will be used to get the actual name of the dump file
2253 destdir = utils.PathJoin(constants.EXPORT_DIR, instance.name + ".new")
2254 finaldestdir = utils.PathJoin(constants.EXPORT_DIR, instance.name)
2256 config = objects.SerializableConfigParser()
2258 config.add_section(constants.INISECT_EXP)
2259 config.set(constants.INISECT_EXP, 'version', '0')
2260 config.set(constants.INISECT_EXP, 'timestamp', '%d' % int(time.time()))
2261 config.set(constants.INISECT_EXP, 'source', instance.primary_node)
2262 config.set(constants.INISECT_EXP, 'os', instance.os)
2263 config.set(constants.INISECT_EXP, "compression", "none")
2265 config.add_section(constants.INISECT_INS)
2266 config.set(constants.INISECT_INS, 'name', instance.name)
2267 config.set(constants.INISECT_INS, 'memory', '%d' %
2268 instance.beparams[constants.BE_MEMORY])
2269 config.set(constants.INISECT_INS, 'vcpus', '%d' %
2270 instance.beparams[constants.BE_VCPUS])
2271 config.set(constants.INISECT_INS, 'disk_template', instance.disk_template)
2272 config.set(constants.INISECT_INS, 'hypervisor', instance.hypervisor)
2275 for nic_count, nic in enumerate(instance.nics):
2277 config.set(constants.INISECT_INS, 'nic%d_mac' %
2278 nic_count, '%s' % nic.mac)
2279 config.set(constants.INISECT_INS, 'nic%d_ip' % nic_count, '%s' % nic.ip)
2280 for param in constants.NICS_PARAMETER_TYPES:
2281 config.set(constants.INISECT_INS, 'nic%d_%s' % (nic_count, param),
2282 '%s' % nic.nicparams.get(param, None))
2283 # TODO: redundant: on load can read nics until it doesn't exist
2284 config.set(constants.INISECT_INS, 'nic_count' , '%d' % nic_total)
2287 for disk_count, disk in enumerate(snap_disks):
2290 config.set(constants.INISECT_INS, 'disk%d_ivname' % disk_count,
2291 ('%s' % disk.iv_name))
2292 config.set(constants.INISECT_INS, 'disk%d_dump' % disk_count,
2293 ('%s' % disk.physical_id[1]))
2294 config.set(constants.INISECT_INS, 'disk%d_size' % disk_count,
2297 config.set(constants.INISECT_INS, 'disk_count' , '%d' % disk_total)
2299 # New-style hypervisor/backend parameters
2301 config.add_section(constants.INISECT_HYP)
2302 for name, value in instance.hvparams.items():
2303 if name not in constants.HVC_GLOBALS:
2304 config.set(constants.INISECT_HYP, name, str(value))
2306 config.add_section(constants.INISECT_BEP)
2307 for name, value in instance.beparams.items():
2308 config.set(constants.INISECT_BEP, name, str(value))
2310 config.add_section(constants.INISECT_OSP)
2311 for name, value in instance.osparams.items():
2312 config.set(constants.INISECT_OSP, name, str(value))
2314 utils.WriteFile(utils.PathJoin(destdir, constants.EXPORT_CONF_FILE),
2315 data=config.Dumps())
2316 shutil.rmtree(finaldestdir, ignore_errors=True)
2317 shutil.move(destdir, finaldestdir)
2320 def ExportInfo(dest):
2321 """Get export configuration information.
2324 @param dest: directory containing the export
2326 @rtype: L{objects.SerializableConfigParser}
2327 @return: a serializable config file containing the
2331 cff = utils.PathJoin(dest, constants.EXPORT_CONF_FILE)
2333 config = objects.SerializableConfigParser()
2336 if (not config.has_section(constants.INISECT_EXP) or
2337 not config.has_section(constants.INISECT_INS)):
2338 _Fail("Export info file doesn't have the required fields")
2340 return config.Dumps()
2344 """Return a list of exports currently available on this machine.
2347 @return: list of the exports
2350 if os.path.isdir(constants.EXPORT_DIR):
2351 return sorted(utils.ListVisibleFiles(constants.EXPORT_DIR))
2353 _Fail("No exports directory")
2356 def RemoveExport(export):
2357 """Remove an existing export from the node.
2360 @param export: the name of the export to remove
2364 target = utils.PathJoin(constants.EXPORT_DIR, export)
2367 shutil.rmtree(target)
2368 except EnvironmentError, err:
2369 _Fail("Error while removing the export: %s", err, exc=True)
2372 def BlockdevRename(devlist):
2373 """Rename a list of block devices.
2375 @type devlist: list of tuples
2376 @param devlist: list of tuples of the form (disk,
2377 new_logical_id, new_physical_id); disk is an
2378 L{objects.Disk} object describing the current disk,
2379 and new logical_id/physical_id is the name we
2382 @return: True if all renames succeeded, False otherwise
2387 for disk, unique_id in devlist:
2388 dev = _RecursiveFindBD(disk)
2390 msgs.append("Can't find device %s in rename" % str(disk))
2394 old_rpath = dev.dev_path
2395 dev.Rename(unique_id)
2396 new_rpath = dev.dev_path
2397 if old_rpath != new_rpath:
2398 DevCacheManager.RemoveCache(old_rpath)
2399 # FIXME: we should add the new cache information here, like:
2400 # DevCacheManager.UpdateCache(new_rpath, owner, ...)
2401 # but we don't have the owner here - maybe parse from existing
2402 # cache? for now, we only lose lvm data when we rename, which
2403 # is less critical than DRBD or MD
2404 except errors.BlockDeviceError, err:
2405 msgs.append("Can't rename device '%s' to '%s': %s" %
2406 (dev, unique_id, err))
2407 logging.exception("Can't rename device '%s' to '%s'", dev, unique_id)
2410 _Fail("; ".join(msgs))
2413 def _TransformFileStorageDir(file_storage_dir):
2414 """Checks whether given file_storage_dir is valid.
2416 Checks wheter the given file_storage_dir is within the cluster-wide
2417 default file_storage_dir stored in SimpleStore. Only paths under that
2418 directory are allowed.
2420 @type file_storage_dir: str
2421 @param file_storage_dir: the path to check
2423 @return: the normalized path if valid, None otherwise
2426 if not constants.ENABLE_FILE_STORAGE:
2427 _Fail("File storage disabled at configure time")
2429 file_storage_dir = os.path.normpath(file_storage_dir)
2430 base_file_storage_dir = cfg.GetFileStorageDir()
2431 if (os.path.commonprefix([file_storage_dir, base_file_storage_dir]) !=
2432 base_file_storage_dir):
2433 _Fail("File storage directory '%s' is not under base file"
2434 " storage directory '%s'", file_storage_dir, base_file_storage_dir)
2435 return file_storage_dir
2438 def CreateFileStorageDir(file_storage_dir):
2439 """Create file storage directory.
2441 @type file_storage_dir: str
2442 @param file_storage_dir: directory to create
2445 @return: tuple with first element a boolean indicating wheter dir
2446 creation was successful or not
2449 file_storage_dir = _TransformFileStorageDir(file_storage_dir)
2450 if os.path.exists(file_storage_dir):
2451 if not os.path.isdir(file_storage_dir):
2452 _Fail("Specified storage dir '%s' is not a directory",
2456 os.makedirs(file_storage_dir, 0750)
2457 except OSError, err:
2458 _Fail("Cannot create file storage directory '%s': %s",
2459 file_storage_dir, err, exc=True)
2462 def RemoveFileStorageDir(file_storage_dir):
2463 """Remove file storage directory.
2465 Remove it only if it's empty. If not log an error and return.
2467 @type file_storage_dir: str
2468 @param file_storage_dir: the directory we should cleanup
2469 @rtype: tuple (success,)
2470 @return: tuple of one element, C{success}, denoting
2471 whether the operation was successful
2474 file_storage_dir = _TransformFileStorageDir(file_storage_dir)
2475 if os.path.exists(file_storage_dir):
2476 if not os.path.isdir(file_storage_dir):
2477 _Fail("Specified Storage directory '%s' is not a directory",
2479 # deletes dir only if empty, otherwise we want to fail the rpc call
2481 os.rmdir(file_storage_dir)
2482 except OSError, err:
2483 _Fail("Cannot remove file storage directory '%s': %s",
2484 file_storage_dir, err)
2487 def RenameFileStorageDir(old_file_storage_dir, new_file_storage_dir):
2488 """Rename the file storage directory.
2490 @type old_file_storage_dir: str
2491 @param old_file_storage_dir: the current path
2492 @type new_file_storage_dir: str
2493 @param new_file_storage_dir: the name we should rename to
2494 @rtype: tuple (success,)
2495 @return: tuple of one element, C{success}, denoting
2496 whether the operation was successful
2499 old_file_storage_dir = _TransformFileStorageDir(old_file_storage_dir)
2500 new_file_storage_dir = _TransformFileStorageDir(new_file_storage_dir)
2501 if not os.path.exists(new_file_storage_dir):
2502 if os.path.isdir(old_file_storage_dir):
2504 os.rename(old_file_storage_dir, new_file_storage_dir)
2505 except OSError, err:
2506 _Fail("Cannot rename '%s' to '%s': %s",
2507 old_file_storage_dir, new_file_storage_dir, err)
2509 _Fail("Specified storage dir '%s' is not a directory",
2510 old_file_storage_dir)
2512 if os.path.exists(old_file_storage_dir):
2513 _Fail("Cannot rename '%s' to '%s': both locations exist",
2514 old_file_storage_dir, new_file_storage_dir)
2517 def _EnsureJobQueueFile(file_name):
2518 """Checks whether the given filename is in the queue directory.
2520 @type file_name: str
2521 @param file_name: the file name we should check
2523 @raises RPCFail: if the file is not valid
2526 queue_dir = os.path.normpath(constants.QUEUE_DIR)
2527 result = (os.path.commonprefix([queue_dir, file_name]) == queue_dir)
2530 _Fail("Passed job queue file '%s' does not belong to"
2531 " the queue directory '%s'", file_name, queue_dir)
2534 def JobQueueUpdate(file_name, content):
2535 """Updates a file in the queue directory.
2537 This is just a wrapper over L{utils.io.WriteFile}, with proper
2540 @type file_name: str
2541 @param file_name: the job file name
2543 @param content: the new job contents
2545 @return: the success of the operation
2548 _EnsureJobQueueFile(file_name)
2549 getents = runtime.GetEnts()
2551 # Write and replace the file atomically
2552 utils.WriteFile(file_name, data=_Decompress(content), uid=getents.masterd_uid,
2553 gid=getents.masterd_gid)
2556 def JobQueueRename(old, new):
2557 """Renames a job queue file.
2559 This is just a wrapper over os.rename with proper checking.
2562 @param old: the old (actual) file name
2564 @param new: the desired file name
2566 @return: the success of the operation and payload
2569 _EnsureJobQueueFile(old)
2570 _EnsureJobQueueFile(new)
2572 utils.RenameFile(old, new, mkdir=True)
2575 def BlockdevClose(instance_name, disks):
2576 """Closes the given block devices.
2578 This means they will be switched to secondary mode (in case of
2581 @param instance_name: if the argument is not empty, the symlinks
2582 of this instance will be removed
2583 @type disks: list of L{objects.Disk}
2584 @param disks: the list of disks to be closed
2585 @rtype: tuple (success, message)
2586 @return: a tuple of success and message, where success
2587 indicates the succes of the operation, and message
2588 which will contain the error details in case we
2594 rd = _RecursiveFindBD(cf)
2596 _Fail("Can't find device %s", cf)
2603 except errors.BlockDeviceError, err:
2604 msg.append(str(err))
2606 _Fail("Can't make devices secondary: %s", ",".join(msg))
2609 _RemoveBlockDevLinks(instance_name, disks)
2612 def ValidateHVParams(hvname, hvparams):
2613 """Validates the given hypervisor parameters.
2615 @type hvname: string
2616 @param hvname: the hypervisor name
2617 @type hvparams: dict
2618 @param hvparams: the hypervisor parameters to be validated
2623 hv_type = hypervisor.GetHypervisor(hvname)
2624 hv_type.ValidateParameters(hvparams)
2625 except errors.HypervisorError, err:
2626 _Fail(str(err), log=False)
2629 def _CheckOSPList(os_obj, parameters):
2630 """Check whether a list of parameters is supported by the OS.
2632 @type os_obj: L{objects.OS}
2633 @param os_obj: OS object to check
2634 @type parameters: list
2635 @param parameters: the list of parameters to check
2638 supported = [v[0] for v in os_obj.supported_parameters]
2639 delta = frozenset(parameters).difference(supported)
2641 _Fail("The following parameters are not supported"
2642 " by the OS %s: %s" % (os_obj.name, utils.CommaJoin(delta)))
2645 def ValidateOS(required, osname, checks, osparams):
2646 """Validate the given OS' parameters.
2648 @type required: boolean
2649 @param required: whether absence of the OS should translate into
2651 @type osname: string
2652 @param osname: the OS to be validated
2654 @param checks: list of the checks to run (currently only 'parameters')
2655 @type osparams: dict
2656 @param osparams: dictionary with OS parameters
2658 @return: True if the validation passed, or False if the OS was not
2659 found and L{required} was false
2662 if not constants.OS_VALIDATE_CALLS.issuperset(checks):
2663 _Fail("Unknown checks required for OS %s: %s", osname,
2664 set(checks).difference(constants.OS_VALIDATE_CALLS))
2666 name_only = objects.OS.GetName(osname)
2667 status, tbv = _TryOSFromDisk(name_only, None)
2675 if max(tbv.api_versions) < constants.OS_API_V20:
2678 if constants.OS_VALIDATE_PARAMETERS in checks:
2679 _CheckOSPList(tbv, osparams.keys())
2681 validate_env = OSCoreEnv(osname, tbv, osparams)
2682 result = utils.RunCmd([tbv.verify_script] + checks, env=validate_env,
2685 logging.error("os validate command '%s' returned error: %s output: %s",
2686 result.cmd, result.fail_reason, result.output)
2687 _Fail("OS validation script failed (%s), output: %s",
2688 result.fail_reason, result.output, log=False)
2694 """Demotes the current node from master candidate role.
2697 # try to ensure we're not the master by mistake
2698 master, myself = ssconf.GetMasterAndMyself()
2699 if master == myself:
2700 _Fail("ssconf status shows I'm the master node, will not demote")
2702 result = utils.RunCmd([constants.DAEMON_UTIL, "check", constants.MASTERD])
2703 if not result.failed:
2704 _Fail("The master daemon is running, will not demote")
2707 if os.path.isfile(constants.CLUSTER_CONF_FILE):
2708 utils.CreateBackup(constants.CLUSTER_CONF_FILE)
2709 except EnvironmentError, err:
2710 if err.errno != errno.ENOENT:
2711 _Fail("Error while backing up cluster file: %s", err, exc=True)
2713 utils.RemoveFile(constants.CLUSTER_CONF_FILE)
2716 def _GetX509Filenames(cryptodir, name):
2717 """Returns the full paths for the private key and certificate.
2720 return (utils.PathJoin(cryptodir, name),
2721 utils.PathJoin(cryptodir, name, _X509_KEY_FILE),
2722 utils.PathJoin(cryptodir, name, _X509_CERT_FILE))
2725 def CreateX509Certificate(validity, cryptodir=constants.CRYPTO_KEYS_DIR):
2726 """Creates a new X509 certificate for SSL/TLS.
2729 @param validity: Validity in seconds
2730 @rtype: tuple; (string, string)
2731 @return: Certificate name and public part
2734 (key_pem, cert_pem) = \
2735 utils.GenerateSelfSignedX509Cert(netutils.Hostname.GetSysName(),
2736 min(validity, _MAX_SSL_CERT_VALIDITY))
2738 cert_dir = tempfile.mkdtemp(dir=cryptodir,
2739 prefix="x509-%s-" % utils.TimestampForFilename())
2741 name = os.path.basename(cert_dir)
2742 assert len(name) > 5
2744 (_, key_file, cert_file) = _GetX509Filenames(cryptodir, name)
2746 utils.WriteFile(key_file, mode=0400, data=key_pem)
2747 utils.WriteFile(cert_file, mode=0400, data=cert_pem)
2749 # Never return private key as it shouldn't leave the node
2750 return (name, cert_pem)
2752 shutil.rmtree(cert_dir, ignore_errors=True)
2756 def RemoveX509Certificate(name, cryptodir=constants.CRYPTO_KEYS_DIR):
2757 """Removes a X509 certificate.
2760 @param name: Certificate name
2763 (cert_dir, key_file, cert_file) = _GetX509Filenames(cryptodir, name)
2765 utils.RemoveFile(key_file)
2766 utils.RemoveFile(cert_file)
2770 except EnvironmentError, err:
2771 _Fail("Cannot remove certificate directory '%s': %s",
2775 def _GetImportExportIoCommand(instance, mode, ieio, ieargs):
2776 """Returns the command for the requested input/output.
2778 @type instance: L{objects.Instance}
2779 @param instance: The instance object
2780 @param mode: Import/export mode
2781 @param ieio: Input/output type
2782 @param ieargs: Input/output arguments
2785 assert mode in (constants.IEM_IMPORT, constants.IEM_EXPORT)
2792 if ieio == constants.IEIO_FILE:
2793 (filename, ) = ieargs
2795 if not utils.IsNormAbsPath(filename):
2796 _Fail("Path '%s' is not normalized or absolute", filename)
2798 directory = os.path.normpath(os.path.dirname(filename))
2800 if (os.path.commonprefix([constants.EXPORT_DIR, directory]) !=
2801 constants.EXPORT_DIR):
2802 _Fail("File '%s' is not under exports directory '%s'",
2803 filename, constants.EXPORT_DIR)
2806 utils.Makedirs(directory, mode=0750)
2808 quoted_filename = utils.ShellQuote(filename)
2810 if mode == constants.IEM_IMPORT:
2811 suffix = "> %s" % quoted_filename
2812 elif mode == constants.IEM_EXPORT:
2813 suffix = "< %s" % quoted_filename
2815 # Retrieve file size
2817 st = os.stat(filename)
2818 except EnvironmentError, err:
2819 logging.error("Can't stat(2) %s: %s", filename, err)
2821 exp_size = utils.BytesToMebibyte(st.st_size)
2823 elif ieio == constants.IEIO_RAW_DISK:
2826 real_disk = _OpenRealBD(disk)
2828 if mode == constants.IEM_IMPORT:
2829 # we set here a smaller block size as, due to transport buffering, more
2830 # than 64-128k will mostly ignored; we use nocreat to fail if the device
2831 # is not already there or we pass a wrong path; we use notrunc to no
2832 # attempt truncate on an LV device; we use oflag=dsync to not buffer too
2833 # much memory; this means that at best, we flush every 64k, which will
2835 suffix = utils.BuildShellCmd(("| dd of=%s conv=nocreat,notrunc"
2836 " bs=%s oflag=dsync"),
2840 elif mode == constants.IEM_EXPORT:
2841 # the block size on the read dd is 1MiB to match our units
2842 prefix = utils.BuildShellCmd("dd if=%s bs=%s count=%s |",
2844 str(1024 * 1024), # 1 MB
2846 exp_size = disk.size
2848 elif ieio == constants.IEIO_SCRIPT:
2849 (disk, disk_index, ) = ieargs
2851 assert isinstance(disk_index, (int, long))
2853 real_disk = _OpenRealBD(disk)
2855 inst_os = OSFromDisk(instance.os)
2856 env = OSEnvironment(instance, inst_os)
2858 if mode == constants.IEM_IMPORT:
2859 env["IMPORT_DEVICE"] = env["DISK_%d_PATH" % disk_index]
2860 env["IMPORT_INDEX"] = str(disk_index)
2861 script = inst_os.import_script
2863 elif mode == constants.IEM_EXPORT:
2864 env["EXPORT_DEVICE"] = real_disk.dev_path
2865 env["EXPORT_INDEX"] = str(disk_index)
2866 script = inst_os.export_script
2868 # TODO: Pass special environment only to script
2869 script_cmd = utils.BuildShellCmd("( cd %s && %s; )", inst_os.path, script)
2871 if mode == constants.IEM_IMPORT:
2872 suffix = "| %s" % script_cmd
2874 elif mode == constants.IEM_EXPORT:
2875 prefix = "%s |" % script_cmd
2877 # Let script predict size
2878 exp_size = constants.IE_CUSTOM_SIZE
2881 _Fail("Invalid %s I/O mode %r", mode, ieio)
2883 return (env, prefix, suffix, exp_size)
2886 def _CreateImportExportStatusDir(prefix):
2887 """Creates status directory for import/export.
2890 return tempfile.mkdtemp(dir=constants.IMPORT_EXPORT_DIR,
2892 (prefix, utils.TimestampForFilename())))
2895 def StartImportExportDaemon(mode, opts, host, port, instance, ieio, ieioargs):
2896 """Starts an import or export daemon.
2898 @param mode: Import/output mode
2899 @type opts: L{objects.ImportExportOptions}
2900 @param opts: Daemon options
2902 @param host: Remote host for export (None for import)
2904 @param port: Remote port for export (None for import)
2905 @type instance: L{objects.Instance}
2906 @param instance: Instance object
2907 @param ieio: Input/output type
2908 @param ieioargs: Input/output arguments
2911 if mode == constants.IEM_IMPORT:
2914 if not (host is None and port is None):
2915 _Fail("Can not specify host or port on import")
2917 elif mode == constants.IEM_EXPORT:
2920 if host is None or port is None:
2921 _Fail("Host and port must be specified for an export")
2924 _Fail("Invalid mode %r", mode)
2926 if (opts.key_name is None) ^ (opts.ca_pem is None):
2927 _Fail("Cluster certificate can only be used for both key and CA")
2929 (cmd_env, cmd_prefix, cmd_suffix, exp_size) = \
2930 _GetImportExportIoCommand(instance, mode, ieio, ieioargs)
2932 if opts.key_name is None:
2934 key_path = constants.NODED_CERT_FILE
2935 cert_path = constants.NODED_CERT_FILE
2936 assert opts.ca_pem is None
2938 (_, key_path, cert_path) = _GetX509Filenames(constants.CRYPTO_KEYS_DIR,
2940 assert opts.ca_pem is not None
2942 for i in [key_path, cert_path]:
2943 if not os.path.exists(i):
2944 _Fail("File '%s' does not exist" % i)
2946 status_dir = _CreateImportExportStatusDir(prefix)
2948 status_file = utils.PathJoin(status_dir, _IES_STATUS_FILE)
2949 pid_file = utils.PathJoin(status_dir, _IES_PID_FILE)
2950 ca_file = utils.PathJoin(status_dir, _IES_CA_FILE)
2952 if opts.ca_pem is None:
2954 ca = utils.ReadFile(constants.NODED_CERT_FILE)
2959 utils.WriteFile(ca_file, data=ca, mode=0400)
2962 constants.IMPORT_EXPORT_DAEMON,
2964 "--key=%s" % key_path,
2965 "--cert=%s" % cert_path,
2966 "--ca=%s" % ca_file,
2970 cmd.append("--host=%s" % host)
2973 cmd.append("--port=%s" % port)
2976 cmd.append("--ipv6")
2978 cmd.append("--ipv4")
2981 cmd.append("--compress=%s" % opts.compress)
2984 cmd.append("--magic=%s" % opts.magic)
2986 if exp_size is not None:
2987 cmd.append("--expected-size=%s" % exp_size)
2990 cmd.append("--cmd-prefix=%s" % cmd_prefix)
2993 cmd.append("--cmd-suffix=%s" % cmd_suffix)
2995 if mode == constants.IEM_EXPORT:
2996 # Retry connection a few times when connecting to remote peer
2997 cmd.append("--connect-retries=%s" % constants.RIE_CONNECT_RETRIES)
2998 cmd.append("--connect-timeout=%s" % constants.RIE_CONNECT_ATTEMPT_TIMEOUT)
2999 elif opts.connect_timeout is not None:
3000 assert mode == constants.IEM_IMPORT
3001 # Overall timeout for establishing connection while listening
3002 cmd.append("--connect-timeout=%s" % opts.connect_timeout)
3004 logfile = _InstanceLogName(prefix, instance.os, instance.name)
3006 # TODO: Once _InstanceLogName uses tempfile.mkstemp, StartDaemon has
3007 # support for receiving a file descriptor for output
3008 utils.StartDaemon(cmd, env=cmd_env, pidfile=pid_file,
3011 # The import/export name is simply the status directory name
3012 return os.path.basename(status_dir)
3015 shutil.rmtree(status_dir, ignore_errors=True)
3019 def GetImportExportStatus(names):
3020 """Returns import/export daemon status.
3022 @type names: sequence
3023 @param names: List of names
3024 @rtype: List of dicts
3025 @return: Returns a list of the state of each named import/export or None if a
3026 status couldn't be read
3032 status_file = utils.PathJoin(constants.IMPORT_EXPORT_DIR, name,
3036 data = utils.ReadFile(status_file)
3037 except EnvironmentError, err:
3038 if err.errno != errno.ENOENT:
3046 result.append(serializer.LoadJson(data))
3051 def AbortImportExport(name):
3052 """Sends SIGTERM to a running import/export daemon.
3055 logging.info("Abort import/export %s", name)
3057 status_dir = utils.PathJoin(constants.IMPORT_EXPORT_DIR, name)
3058 pid = utils.ReadLockedPidFile(utils.PathJoin(status_dir, _IES_PID_FILE))
3061 logging.info("Import/export %s is running with PID %s, sending SIGTERM",
3063 utils.IgnoreProcessNotFound(os.kill, pid, signal.SIGTERM)
3066 def CleanupImportExport(name):
3067 """Cleanup after an import or export.
3069 If the import/export daemon is still running it's killed. Afterwards the
3070 whole status directory is removed.
3073 logging.info("Finalizing import/export %s", name)
3075 status_dir = utils.PathJoin(constants.IMPORT_EXPORT_DIR, name)
3077 pid = utils.ReadLockedPidFile(utils.PathJoin(status_dir, _IES_PID_FILE))
3080 logging.info("Import/export %s is still running with PID %s",
3082 utils.KillProcess(pid, waitpid=False)
3084 shutil.rmtree(status_dir, ignore_errors=True)
3087 def _FindDisks(nodes_ip, disks):
3088 """Sets the physical ID on disks and returns the block devices.
3091 # set the correct physical ID
3092 my_name = netutils.Hostname.GetSysName()
3094 cf.SetPhysicalID(my_name, nodes_ip)
3099 rd = _RecursiveFindBD(cf)
3101 _Fail("Can't find device %s", cf)
3106 def DrbdDisconnectNet(nodes_ip, disks):
3107 """Disconnects the network on a list of drbd devices.
3110 bdevs = _FindDisks(nodes_ip, disks)
3116 except errors.BlockDeviceError, err:
3117 _Fail("Can't change network configuration to standalone mode: %s",
3121 def DrbdAttachNet(nodes_ip, disks, instance_name, multimaster):
3122 """Attaches the network on a list of drbd devices.
3125 bdevs = _FindDisks(nodes_ip, disks)
3128 for idx, rd in enumerate(bdevs):
3130 _SymlinkBlockDev(instance_name, rd.dev_path, idx)
3131 except EnvironmentError, err:
3132 _Fail("Can't create symlink: %s", err)
3133 # reconnect disks, switch to new master configuration and if
3134 # needed primary mode
3137 rd.AttachNet(multimaster)
3138 except errors.BlockDeviceError, err:
3139 _Fail("Can't change network configuration: %s", err)
3141 # wait until the disks are connected; we need to retry the re-attach
3142 # if the device becomes standalone, as this might happen if the one
3143 # node disconnects and reconnects in a different mode before the
3144 # other node reconnects; in this case, one or both of the nodes will
3145 # decide it has wrong configuration and switch to standalone
3148 all_connected = True
3151 stats = rd.GetProcStatus()
3153 all_connected = (all_connected and
3154 (stats.is_connected or stats.is_in_resync))
3156 if stats.is_standalone:
3157 # peer had different config info and this node became
3158 # standalone, even though this should not happen with the
3159 # new staged way of changing disk configs
3161 rd.AttachNet(multimaster)
3162 except errors.BlockDeviceError, err:
3163 _Fail("Can't change network configuration: %s", err)
3165 if not all_connected:
3166 raise utils.RetryAgain()
3169 # Start with a delay of 100 miliseconds and go up to 5 seconds
3170 utils.Retry(_Attach, (0.1, 1.5, 5.0), 2 * 60)
3171 except utils.RetryTimeout:
3172 _Fail("Timeout in disk reconnecting")
3175 # change to primary mode
3179 except errors.BlockDeviceError, err:
3180 _Fail("Can't change to primary mode: %s", err)
3183 def DrbdWaitSync(nodes_ip, disks):
3184 """Wait until DRBDs have synchronized.
3188 stats = rd.GetProcStatus()
3189 if not (stats.is_connected or stats.is_in_resync):
3190 raise utils.RetryAgain()
3193 bdevs = _FindDisks(nodes_ip, disks)
3199 # poll each second for 15 seconds
3200 stats = utils.Retry(_helper, 1, 15, args=[rd])
3201 except utils.RetryTimeout:
3202 stats = rd.GetProcStatus()
3204 if not (stats.is_connected or stats.is_in_resync):
3205 _Fail("DRBD device %s is not in sync: stats=%s", rd, stats)
3206 alldone = alldone and (not stats.is_in_resync)
3207 if stats.sync_percent is not None:
3208 min_resync = min(min_resync, stats.sync_percent)
3210 return (alldone, min_resync)
3213 def GetDrbdUsermodeHelper():
3214 """Returns DRBD usermode helper currently configured.
3218 return bdev.BaseDRBD.GetUsermodeHelper()
3219 except errors.BlockDeviceError, err:
3223 def PowercycleNode(hypervisor_type):
3224 """Hard-powercycle the node.
3226 Because we need to return first, and schedule the powercycle in the
3227 background, we won't be able to report failures nicely.
3230 hyper = hypervisor.GetHypervisor(hypervisor_type)
3234 # if we can't fork, we'll pretend that we're in the child process
3237 return "Reboot scheduled in 5 seconds"
3238 # ensure the child is running on ram
3241 except Exception: # pylint: disable-msg=W0703
3244 hyper.PowercycleNode()
3247 class HooksRunner(object):
3250 This class is instantiated on the node side (ganeti-noded) and not
3254 def __init__(self, hooks_base_dir=None):
3255 """Constructor for hooks runner.
3257 @type hooks_base_dir: str or None
3258 @param hooks_base_dir: if not None, this overrides the
3259 L{constants.HOOKS_BASE_DIR} (useful for unittests)
3262 if hooks_base_dir is None:
3263 hooks_base_dir = constants.HOOKS_BASE_DIR
3264 # yeah, _BASE_DIR is not valid for attributes, we use it like a
3266 self._BASE_DIR = hooks_base_dir # pylint: disable-msg=C0103
3268 def RunHooks(self, hpath, phase, env):
3269 """Run the scripts in the hooks directory.
3272 @param hpath: the path to the hooks directory which
3275 @param phase: either L{constants.HOOKS_PHASE_PRE} or
3276 L{constants.HOOKS_PHASE_POST}
3278 @param env: dictionary with the environment for the hook
3280 @return: list of 3-element tuples:
3282 - script result, either L{constants.HKR_SUCCESS} or
3283 L{constants.HKR_FAIL}
3284 - output of the script
3286 @raise errors.ProgrammerError: for invalid input
3290 if phase == constants.HOOKS_PHASE_PRE:
3292 elif phase == constants.HOOKS_PHASE_POST:
3295 _Fail("Unknown hooks phase '%s'", phase)
3298 subdir = "%s-%s.d" % (hpath, suffix)
3299 dir_name = utils.PathJoin(self._BASE_DIR, subdir)
3303 if not os.path.isdir(dir_name):
3304 # for non-existing/non-dirs, we simply exit instead of logging a
3305 # warning at every operation
3308 runparts_results = utils.RunParts(dir_name, env=env, reset_env=True)
3310 for (relname, relstatus, runresult) in runparts_results:
3311 if relstatus == constants.RUNPARTS_SKIP:
3312 rrval = constants.HKR_SKIP
3314 elif relstatus == constants.RUNPARTS_ERR:
3315 rrval = constants.HKR_FAIL
3316 output = "Hook script execution error: %s" % runresult
3317 elif relstatus == constants.RUNPARTS_RUN:
3318 if runresult.failed:
3319 rrval = constants.HKR_FAIL
3321 rrval = constants.HKR_SUCCESS
3322 output = utils.SafeEncode(runresult.output.strip())
3323 results.append(("%s/%s" % (subdir, relname), rrval, output))
3328 class IAllocatorRunner(object):
3329 """IAllocator runner.
3331 This class is instantiated on the node side (ganeti-noded) and not on
3336 def Run(name, idata):
3337 """Run an iallocator script.
3340 @param name: the iallocator script name
3342 @param idata: the allocator input data
3345 @return: two element tuple of:
3347 - either error message or stdout of allocator (for success)
3350 alloc_script = utils.FindFile(name, constants.IALLOCATOR_SEARCH_PATH,
3352 if alloc_script is None:
3353 _Fail("iallocator module '%s' not found in the search path", name)
3355 fd, fin_name = tempfile.mkstemp(prefix="ganeti-iallocator.")
3359 result = utils.RunCmd([alloc_script, fin_name])
3361 _Fail("iallocator module '%s' failed: %s, output '%s'",
3362 name, result.fail_reason, result.output)
3366 return result.stdout
3369 class DevCacheManager(object):
3370 """Simple class for managing a cache of block device information.
3373 _DEV_PREFIX = "/dev/"
3374 _ROOT_DIR = constants.BDEV_CACHE_DIR
3377 def _ConvertPath(cls, dev_path):
3378 """Converts a /dev/name path to the cache file name.
3380 This replaces slashes with underscores and strips the /dev
3381 prefix. It then returns the full path to the cache file.
3384 @param dev_path: the C{/dev/} path name
3386 @return: the converted path name
3389 if dev_path.startswith(cls._DEV_PREFIX):
3390 dev_path = dev_path[len(cls._DEV_PREFIX):]
3391 dev_path = dev_path.replace("/", "_")
3392 fpath = utils.PathJoin(cls._ROOT_DIR, "bdev_%s" % dev_path)
3396 def UpdateCache(cls, dev_path, owner, on_primary, iv_name):
3397 """Updates the cache information for a given device.
3400 @param dev_path: the pathname of the device
3402 @param owner: the owner (instance name) of the device
3403 @type on_primary: bool
3404 @param on_primary: whether this is the primary
3407 @param iv_name: the instance-visible name of the
3408 device, as in objects.Disk.iv_name
3413 if dev_path is None:
3414 logging.error("DevCacheManager.UpdateCache got a None dev_path")
3416 fpath = cls._ConvertPath(dev_path)
3422 iv_name = "not_visible"
3423 fdata = "%s %s %s\n" % (str(owner), state, iv_name)
3425 utils.WriteFile(fpath, data=fdata)
3426 except EnvironmentError, err:
3427 logging.exception("Can't update bdev cache for %s: %s", dev_path, err)
3430 def RemoveCache(cls, dev_path):
3431 """Remove data for a dev_path.
3433 This is just a wrapper over L{utils.io.RemoveFile} with a converted
3434 path name and logging.
3437 @param dev_path: the pathname of the device
3442 if dev_path is None:
3443 logging.error("DevCacheManager.RemoveCache got a None dev_path")
3445 fpath = cls._ConvertPath(dev_path)
3447 utils.RemoveFile(fpath)
3448 except EnvironmentError, err:
3449 logging.exception("Can't update bdev cache for %s: %s", dev_path, err)