4 # Copyright (C) 2006, 2007 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 """Functions used by the node daemon"""
39 from ganeti import errors
40 from ganeti import utils
41 from ganeti import ssh
42 from ganeti import hypervisor
43 from ganeti import constants
44 from ganeti import bdev
45 from ganeti import objects
46 from ganeti import ssconf
50 """Simple wrapper to return a SimpleStore.
52 @rtype: L{ssconf.SimpleStore}
53 @return: a SimpleStore instance
56 return ssconf.SimpleStore()
59 def _GetSshRunner(cluster_name):
60 """Simple wrapper to return an SshRunner.
62 @type cluster_name: str
63 @param cluster_name: the cluster name, which is needed
64 by the SshRunner constructor
65 @rtype: L{ssh.SshRunner}
66 @return: an SshRunner instance
69 return ssh.SshRunner(cluster_name)
72 def _Decompress(data):
73 """Unpacks data compressed by the RPC client.
75 @type data: list or tuple
76 @param data: Data sent by RPC client
78 @return: Decompressed data
81 assert isinstance(data, (list, tuple))
83 (encoding, content) = data
84 if encoding == constants.RPC_ENCODING_NONE:
86 elif encoding == constants.RPC_ENCODING_ZLIB_BASE64:
87 return zlib.decompress(base64.b64decode(content))
89 raise AssertionError("Unknown data encoding")
92 def _CleanDirectory(path, exclude=None):
93 """Removes all regular files in a directory.
96 @param path: the directory to clean
98 @param exclude: list of files to be excluded, defaults
102 if not os.path.isdir(path):
107 # Normalize excluded paths
108 exclude = [os.path.normpath(i) for i in exclude]
110 for rel_name in utils.ListVisibleFiles(path):
111 full_name = os.path.normpath(os.path.join(path, rel_name))
112 if full_name in exclude:
114 if os.path.isfile(full_name) and not os.path.islink(full_name):
115 utils.RemoveFile(full_name)
119 """Removes job queue files and archived jobs.
124 _CleanDirectory(constants.QUEUE_DIR, exclude=[constants.JOB_QUEUE_LOCK_FILE])
125 _CleanDirectory(constants.JOB_QUEUE_ARCHIVE_DIR)
129 """Returns master information.
131 This is an utility function to compute master information, either
132 for consumption here or from the node daemon.
135 @return: (master_netdev, master_ip, master_name) if we have a good
136 configuration, otherwise (None, None, None)
141 master_netdev = cfg.GetMasterNetdev()
142 master_ip = cfg.GetMasterIP()
143 master_node = cfg.GetMasterNode()
144 except errors.ConfigurationError, err:
145 logging.exception("Cluster configuration incomplete")
146 return (None, None, None)
147 return (master_netdev, master_ip, master_node)
150 def StartMaster(start_daemons):
151 """Activate local node as master node.
153 The function will always try activate the IP address of the master
154 (unless someone else has it). It will also start the master daemons,
155 based on the start_daemons parameter.
157 @type start_daemons: boolean
158 @param start_daemons: whther to also start the master
159 daemons (ganeti-masterd and ganeti-rapi)
164 master_netdev, master_ip, _ = GetMasterInfo()
165 if not master_netdev:
168 if utils.TcpPing(master_ip, constants.DEFAULT_NODED_PORT):
169 if utils.OwnIpAddress(master_ip):
170 # we already have the ip:
171 logging.debug("Already started")
173 logging.error("Someone else has the master ip, not activating")
176 result = utils.RunCmd(["ip", "address", "add", "%s/32" % master_ip,
177 "dev", master_netdev, "label",
178 "%s:0" % master_netdev])
180 logging.error("Can't activate master IP: %s", result.output)
183 result = utils.RunCmd(["arping", "-q", "-U", "-c 3", "-I", master_netdev,
184 "-s", master_ip, master_ip])
185 # we'll ignore the exit code of arping
187 # and now start the master and rapi daemons
189 for daemon in 'ganeti-masterd', 'ganeti-rapi':
190 result = utils.RunCmd([daemon])
192 logging.error("Can't start daemon %s: %s", daemon, result.output)
197 def StopMaster(stop_daemons):
198 """Deactivate this node as master.
200 The function will always try to deactivate the IP address of the
201 master. It will also stop the master daemons depending on the
202 stop_daemons parameter.
204 @type stop_daemons: boolean
205 @param stop_daemons: whether to also stop the master daemons
206 (ganeti-masterd and ganeti-rapi)
210 master_netdev, master_ip, _ = GetMasterInfo()
211 if not master_netdev:
214 result = utils.RunCmd(["ip", "address", "del", "%s/32" % master_ip,
215 "dev", master_netdev])
217 logging.error("Can't remove the master IP, error: %s", result.output)
218 # but otherwise ignore the failure
221 # stop/kill the rapi and the master daemon
222 for daemon in constants.RAPI_PID, constants.MASTERD_PID:
223 utils.KillProcess(utils.ReadPidFile(utils.DaemonPidFileName(daemon)))
228 def AddNode(dsa, dsapub, rsa, rsapub, sshkey, sshpub):
229 """Joins this node to the cluster.
231 This does the following:
232 - updates the hostkeys of the machine (rsa and dsa)
233 - adds the ssh private key to the user
234 - adds the ssh public key to the users' authorized_keys file
237 @param dsa: the DSA private key to write
239 @param dsapub: the DSA public key to write
241 @param rsa: the RSA private key to write
243 @param rsapub: the RSA public key to write
245 @param sshkey: the SSH private key to write
247 @param sshpub: the SSH public key to write
249 @return: the success of the operation
252 sshd_keys = [(constants.SSH_HOST_RSA_PRIV, rsa, 0600),
253 (constants.SSH_HOST_RSA_PUB, rsapub, 0644),
254 (constants.SSH_HOST_DSA_PRIV, dsa, 0600),
255 (constants.SSH_HOST_DSA_PUB, dsapub, 0644)]
256 for name, content, mode in sshd_keys:
257 utils.WriteFile(name, data=content, mode=mode)
260 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS,
262 except errors.OpExecError, err:
263 msg = "Error while processing user ssh files"
264 logging.exception(msg)
265 return (False, "%s: %s" % (msg, err))
267 for name, content in [(priv_key, sshkey), (pub_key, sshpub)]:
268 utils.WriteFile(name, data=content, mode=0600)
270 utils.AddAuthorizedKey(auth_keys, sshpub)
272 utils.RunCmd([constants.SSH_INITD_SCRIPT, "restart"])
274 return (True, "Node added successfully")
278 """Cleans up and remove the current node.
280 This function cleans up and prepares the current node to be removed
283 If processing is successful, then it raises an
284 L{errors.QuitGanetiException} which is used as a special case to
285 shutdown the node daemon.
288 _CleanDirectory(constants.DATA_DIR)
292 priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.GANETI_RUNAS)
293 except errors.OpExecError:
294 logging.exception("Error while processing ssh files")
297 f = open(pub_key, 'r')
299 utils.RemoveAuthorizedKey(auth_keys, f.read(8192))
303 utils.RemoveFile(priv_key)
304 utils.RemoveFile(pub_key)
306 # Return a reassuring string to the caller, and quit
307 raise errors.QuitGanetiException(False, 'Shutdown scheduled')
310 def GetNodeInfo(vgname, hypervisor_type):
311 """Gives back a hash with different informations about the node.
313 @type vgname: C{string}
314 @param vgname: the name of the volume group to ask for disk space information
315 @type hypervisor_type: C{str}
316 @param hypervisor_type: the name of the hypervisor to ask for
319 @return: dictionary with the following keys:
320 - vg_size is the size of the configured volume group in MiB
321 - vg_free is the free size of the volume group in MiB
322 - memory_dom0 is the memory allocated for domain0 in MiB
323 - memory_free is the currently available (free) ram in MiB
324 - memory_total is the total number of ram in MiB
328 vginfo = _GetVGInfo(vgname)
329 outputarray['vg_size'] = vginfo['vg_size']
330 outputarray['vg_free'] = vginfo['vg_free']
332 hyper = hypervisor.GetHypervisor(hypervisor_type)
333 hyp_info = hyper.GetNodeInfo()
334 if hyp_info is not None:
335 outputarray.update(hyp_info)
337 f = open("/proc/sys/kernel/random/boot_id", 'r')
339 outputarray["bootid"] = f.read(128).rstrip("\n")
346 def VerifyNode(what, cluster_name):
347 """Verify the status of the local node.
349 Based on the input L{what} parameter, various checks are done on the
352 If the I{filelist} key is present, this list of
353 files is checksummed and the file/checksum pairs are returned.
355 If the I{nodelist} key is present, we check that we have
356 connectivity via ssh with the target nodes (and check the hostname
359 If the I{node-net-test} key is present, we check that we have
360 connectivity to the given nodes via both primary IP and, if
361 applicable, secondary IPs.
364 @param what: a dictionary of things to check:
365 - filelist: list of files for which to compute checksums
366 - nodelist: list of nodes we should check ssh communication with
367 - node-net-test: list of nodes we should check node daemon port
369 - hypervisor: list with hypervisors to run the verify for
371 @return: a dictionary with the same keys as the input dict, and
372 values representing the result of the checks
377 if constants.NV_HYPERVISOR in what:
378 result[constants.NV_HYPERVISOR] = tmp = {}
379 for hv_name in what[constants.NV_HYPERVISOR]:
380 tmp[hv_name] = hypervisor.GetHypervisor(hv_name).Verify()
382 if constants.NV_FILELIST in what:
383 result[constants.NV_FILELIST] = utils.FingerprintFiles(
384 what[constants.NV_FILELIST])
386 if constants.NV_NODELIST in what:
387 result[constants.NV_NODELIST] = tmp = {}
388 random.shuffle(what[constants.NV_NODELIST])
389 for node in what[constants.NV_NODELIST]:
390 success, message = _GetSshRunner(cluster_name).VerifyNodeHostname(node)
394 if constants.NV_NODENETTEST in what:
395 result[constants.NV_NODENETTEST] = tmp = {}
396 my_name = utils.HostInfo().name
397 my_pip = my_sip = None
398 for name, pip, sip in what[constants.NV_NODENETTEST]:
404 tmp[my_name] = ("Can't find my own primary/secondary IP"
407 port = utils.GetNodeDaemonPort()
408 for name, pip, sip in what[constants.NV_NODENETTEST]:
410 if not utils.TcpPing(pip, port, source=my_pip):
411 fail.append("primary")
413 if not utils.TcpPing(sip, port, source=my_sip):
414 fail.append("secondary")
416 tmp[name] = ("failure using the %s interface(s)" %
419 if constants.NV_LVLIST in what:
420 result[constants.NV_LVLIST] = GetVolumeList(what[constants.NV_LVLIST])
422 if constants.NV_INSTANCELIST in what:
423 result[constants.NV_INSTANCELIST] = GetInstanceList(
424 what[constants.NV_INSTANCELIST])
426 if constants.NV_VGLIST in what:
427 result[constants.NV_VGLIST] = ListVolumeGroups()
429 if constants.NV_VERSION in what:
430 result[constants.NV_VERSION] = (constants.PROTOCOL_VERSION,
431 constants.RELEASE_VERSION)
433 if constants.NV_HVINFO in what:
434 hyper = hypervisor.GetHypervisor(what[constants.NV_HVINFO])
435 result[constants.NV_HVINFO] = hyper.GetNodeInfo()
437 if constants.NV_DRBDLIST in what:
439 used_minors = bdev.DRBD8.GetUsedDevs().keys()
440 except errors.BlockDeviceError:
441 logging.warning("Can't get used minors list", exc_info=True)
443 result[constants.NV_DRBDLIST] = used_minors
448 def GetVolumeList(vg_name):
449 """Compute list of logical volumes and their size.
452 @param vg_name: the volume group whose LVs we should list
455 dictionary of all partions (key) with value being a tuple of
456 their size (in MiB), inactive and online status::
458 {'test1': ('20.06', True, True)}
460 in case of errors, a string is returned with the error
466 result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
467 "--separator=%s" % sep,
468 "-olv_name,lv_size,lv_attr", vg_name])
470 logging.error("Failed to list logical volumes, lvs output: %s",
474 valid_line_re = re.compile("^ *([^|]+)\|([0-9.]+)\|([^|]{6})\|?$")
475 for line in result.stdout.splitlines():
477 match = valid_line_re.match(line)
479 logging.error("Invalid line returned from lvs output: '%s'", line)
481 name, size, attr = match.groups()
482 inactive = attr[4] == '-'
483 online = attr[5] == 'o'
484 lvs[name] = (size, inactive, online)
489 def ListVolumeGroups():
490 """List the volume groups and their size.
493 @return: dictionary with keys volume name and values the
497 return utils.ListVolumeGroups()
501 """List all volumes on this node.
505 A list of dictionaries, each having four keys:
506 - name: the logical volume name,
507 - size: the size of the logical volume
508 - dev: the physical device on which the LV lives
509 - vg: the volume group to which it belongs
511 In case of errors, we return an empty list and log the
514 Note that since a logical volume can live on multiple physical
515 volumes, the resulting list might include a logical volume
519 result = utils.RunCmd(["lvs", "--noheadings", "--units=m", "--nosuffix",
521 "--options=lv_name,lv_size,devices,vg_name"])
523 logging.error("Failed to list logical volumes, lvs output: %s",
529 return dev.split('(')[0]
535 'name': line[0].strip(),
536 'size': line[1].strip(),
537 'dev': parse_dev(line[2].strip()),
538 'vg': line[3].strip(),
541 return [map_line(line.split('|')) for line in result.stdout.splitlines()
542 if line.count('|') >= 3]
545 def BridgesExist(bridges_list):
546 """Check if a list of bridges exist on the current node.
549 @return: C{True} if all of them exist, C{False} otherwise
552 for bridge in bridges_list:
553 if not utils.BridgeExists(bridge):
559 def GetInstanceList(hypervisor_list):
560 """Provides a list of instances.
562 @type hypervisor_list: list
563 @param hypervisor_list: the list of hypervisors to query information
566 @return: a list of all running instances on the current node
567 - instance1.example.com
568 - instance2.example.com
572 for hname in hypervisor_list:
574 names = hypervisor.GetHypervisor(hname).ListInstances()
575 results.extend(names)
576 except errors.HypervisorError, err:
577 logging.exception("Error enumerating instances for hypevisor %s", hname)
578 # FIXME: should we somehow not propagate this to the master?
584 def GetInstanceInfo(instance, hname):
585 """Gives back the informations about an instance as a dictionary.
587 @type instance: string
588 @param instance: the instance name
590 @param hname: the hypervisor type of the instance
593 @return: dictionary with the following keys:
594 - memory: memory size of instance (int)
595 - state: xen state of instance (string)
596 - time: cpu time of instance (float)
601 iinfo = hypervisor.GetHypervisor(hname).GetInstanceInfo(instance)
602 if iinfo is not None:
603 output['memory'] = iinfo[2]
604 output['state'] = iinfo[4]
605 output['time'] = iinfo[5]
610 def GetInstanceMigratable(instance):
611 """Gives whether an instance can be migrated.
613 @type instance: L{objects.Instance}
614 @param instance: object representing the instance to be checked.
617 @return: tuple of (result, description) where:
618 - result: whether the instance can be migrated or not
619 - description: a description of the issue, if relevant
622 hyper = hypervisor.GetHypervisor(instance.hypervisor)
623 if instance.name not in hyper.ListInstances():
624 return (False, 'not running')
626 for idx in range(len(instance.disks)):
627 link_name = _GetBlockDevSymlinkPath(instance.name, idx)
628 if not os.path.islink(link_name):
629 return (False, 'not restarted since ganeti 1.2.5')
634 def GetAllInstancesInfo(hypervisor_list):
635 """Gather data about all instances.
637 This is the equivalent of L{GetInstanceInfo}, except that it
638 computes data for all instances at once, thus being faster if one
639 needs data about more than one instance.
641 @type hypervisor_list: list
642 @param hypervisor_list: list of hypervisors to query for instance data
645 @return: dictionary of instance: data, with data having the following keys:
646 - memory: memory size of instance (int)
647 - state: xen state of instance (string)
648 - time: cpu time of instance (float)
649 - vcpus: the number of vcpus
654 for hname in hypervisor_list:
655 iinfo = hypervisor.GetHypervisor(hname).GetAllInstancesInfo()
657 for name, inst_id, memory, vcpus, state, times in iinfo:
664 if name in output and output[name] != value:
665 raise errors.HypervisorError("Instance %s running duplicate"
666 " with different parameters" % name)
672 def InstanceOsAdd(instance):
673 """Add an OS to an instance.
675 @type instance: L{objects.Instance}
676 @param instance: Instance whose OS is to be installed
678 @return: the success of the operation
682 inst_os = OSFromDisk(instance.os)
683 except errors.InvalidOS, err:
684 os_name, os_dir, os_err = err.args
686 return (False, "Can't find OS '%s': %s" % (os_name, os_err))
688 return (False, "Error parsing OS '%s' in directory %s: %s" %
689 (os_name, os_dir, os_err))
691 create_env = OSEnvironment(instance)
693 logfile = "%s/add-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
694 instance.name, int(time.time()))
696 result = utils.RunCmd([inst_os.create_script], env=create_env,
697 cwd=inst_os.path, output=logfile,)
699 logging.error("os create command '%s' returned error: %s, logfile: %s,"
700 " output: %s", result.cmd, result.fail_reason, logfile,
702 lines = [utils.SafeEncode(val)
703 for val in utils.TailFile(logfile, lines=20)]
704 return (False, "OS create script failed (%s), last lines in the"
705 " log file:\n%s" % (result.fail_reason, "\n".join(lines)))
707 return (True, "Successfully installed")
710 def RunRenameInstance(instance, old_name):
711 """Run the OS rename script for an instance.
713 @type instance: L{objects.Instance}
714 @param instance: Instance whose OS is to be installed
715 @type old_name: string
716 @param old_name: previous instance name
718 @return: the success of the operation
721 inst_os = OSFromDisk(instance.os)
723 rename_env = OSEnvironment(instance)
724 rename_env['OLD_INSTANCE_NAME'] = old_name
726 logfile = "%s/rename-%s-%s-%s-%d.log" % (constants.LOG_OS_DIR, instance.os,
728 instance.name, int(time.time()))
730 result = utils.RunCmd([inst_os.rename_script], env=rename_env,
731 cwd=inst_os.path, output=logfile)
734 logging.error("os create command '%s' returned error: %s output: %s",
735 result.cmd, result.fail_reason, result.output)
736 lines = [utils.SafeEncode(val)
737 for val in utils.TailFile(logfile, lines=20)]
738 return (False, "OS rename script failed (%s), last lines in the"
739 " log file:\n%s" % (result.fail_reason, "\n".join(lines)))
741 return (True, "Rename successful")
744 def _GetVGInfo(vg_name):
745 """Get informations about the volume group.
748 @param vg_name: the volume group which we query
751 A dictionary with the following keys:
752 - C{vg_size} is the total size of the volume group in MiB
753 - C{vg_free} is the free size of the volume group in MiB
754 - C{pv_count} are the number of physical disks in that VG
756 If an error occurs during gathering of data, we return the same dict
757 with keys all set to None.
760 retdic = dict.fromkeys(["vg_size", "vg_free", "pv_count"])
762 retval = utils.RunCmd(["vgs", "-ovg_size,vg_free,pv_count", "--noheadings",
763 "--nosuffix", "--units=m", "--separator=:", vg_name])
766 logging.error("volume group %s not present", vg_name)
768 valarr = retval.stdout.strip().rstrip(':').split(':')
772 "vg_size": int(round(float(valarr[0]), 0)),
773 "vg_free": int(round(float(valarr[1]), 0)),
774 "pv_count": int(valarr[2]),
776 except ValueError, err:
777 logging.exception("Fail to parse vgs output")
779 logging.error("vgs output has the wrong number of fields (expected"
780 " three): %s", str(valarr))
784 def _GetBlockDevSymlinkPath(instance_name, idx):
785 return os.path.join(constants.DISK_LINKS_DIR,
786 "%s:%d" % (instance_name, idx))
789 def _SymlinkBlockDev(instance_name, device_path, idx):
790 """Set up symlinks to a instance's block device.
792 This is an auxiliary function run when an instance is start (on the primary
793 node) or when an instance is migrated (on the target node).
796 @param instance_name: the name of the target instance
797 @param device_path: path of the physical block device, on the node
798 @param idx: the disk index
799 @return: absolute path to the disk's symlink
802 link_name = _GetBlockDevSymlinkPath(instance_name, idx)
804 os.symlink(device_path, link_name)
806 if err.errno == errno.EEXIST:
807 if (not os.path.islink(link_name) or
808 os.readlink(link_name) != device_path):
810 os.symlink(device_path, link_name)
817 def _RemoveBlockDevLinks(instance_name, disks):
818 """Remove the block device symlinks belonging to the given instance.
821 for idx, disk in enumerate(disks):
822 link_name = _GetBlockDevSymlinkPath(instance_name, idx)
823 if os.path.islink(link_name):
827 logging.exception("Can't remove symlink '%s'", link_name)
830 def _GatherAndLinkBlockDevs(instance):
831 """Set up an instance's block device(s).
833 This is run on the primary node at instance startup. The block
834 devices must be already assembled.
836 @type instance: L{objects.Instance}
837 @param instance: the instance whose disks we shoul assemble
839 @return: list of (disk_object, device_path)
843 for idx, disk in enumerate(instance.disks):
844 device = _RecursiveFindBD(disk)
846 raise errors.BlockDeviceError("Block device '%s' is not set up." %
850 link_name = _SymlinkBlockDev(instance.name, device.dev_path, idx)
852 raise errors.BlockDeviceError("Cannot create block device symlink: %s" %
855 block_devices.append((disk, link_name))
860 def StartInstance(instance, extra_args):
861 """Start an instance.
863 @type instance: L{objects.Instance}
864 @param instance: the instance object
866 @return: whether the startup was successful or not
869 running_instances = GetInstanceList([instance.hypervisor])
871 if instance.name in running_instances:
872 return (True, "Already running")
875 block_devices = _GatherAndLinkBlockDevs(instance)
876 hyper = hypervisor.GetHypervisor(instance.hypervisor)
877 hyper.StartInstance(instance, block_devices, extra_args)
878 except errors.BlockDeviceError, err:
879 logging.exception("Failed to start instance")
880 return (False, "Block device error: %s" % str(err))
881 except errors.HypervisorError, err:
882 logging.exception("Failed to start instance")
883 _RemoveBlockDevLinks(instance.name, instance.disks)
884 return (False, "Hypervisor error: %s" % str(err))
886 return (True, "Instance started successfully")
889 def ShutdownInstance(instance):
890 """Shut an instance down.
892 @note: this functions uses polling with a hardcoded timeout.
894 @type instance: L{objects.Instance}
895 @param instance: the instance object
897 @return: whether the startup was successful or not
900 hv_name = instance.hypervisor
901 running_instances = GetInstanceList([hv_name])
903 if instance.name not in running_instances:
906 hyper = hypervisor.GetHypervisor(hv_name)
908 hyper.StopInstance(instance)
909 except errors.HypervisorError, err:
910 logging.error("Failed to stop instance: %s" % err)
913 # test every 10secs for 2min
916 for dummy in range(11):
917 if instance.name not in GetInstanceList([hv_name]):
921 # the shutdown did not succeed
922 logging.error("Shutdown of '%s' unsuccessful, using destroy",
926 hyper.StopInstance(instance, force=True)
927 except errors.HypervisorError, err:
928 logging.exception("Failed to stop instance: %s" % err)
932 if instance.name in GetInstanceList([hv_name]):
933 logging.error("Could not shutdown instance '%s' even by destroy",
937 _RemoveBlockDevLinks(instance.name, instance.disks)
942 def RebootInstance(instance, reboot_type, extra_args):
943 """Reboot an instance.
945 @type instance: L{objects.Instance}
946 @param instance: the instance object to reboot
947 @type reboot_type: str
948 @param reboot_type: the type of reboot, one the following
950 - L{constants.INSTANCE_REBOOT_SOFT}: only reboot the
951 instance OS, do not recreate the VM
952 - L{constants.INSTANCE_REBOOT_HARD}: tear down and
953 restart the VM (at the hypervisor level)
954 - the other reboot type (L{constants.INSTANCE_REBOOT_HARD})
955 is not accepted here, since that mode is handled
958 @return: the success of the operation
961 running_instances = GetInstanceList([instance.hypervisor])
963 if instance.name not in running_instances:
964 logging.error("Cannot reboot instance that is not running")
967 hyper = hypervisor.GetHypervisor(instance.hypervisor)
968 if reboot_type == constants.INSTANCE_REBOOT_SOFT:
970 hyper.RebootInstance(instance)
971 except errors.HypervisorError, err:
972 logging.exception("Failed to soft reboot instance")
974 elif reboot_type == constants.INSTANCE_REBOOT_HARD:
976 ShutdownInstance(instance)
977 StartInstance(instance, extra_args)
978 except errors.HypervisorError, err:
979 logging.exception("Failed to hard reboot instance")
982 raise errors.ParameterError("reboot_type invalid")
987 def MigrationInfo(instance):
988 """Gather information about an instance to be migrated.
990 @type instance: L{objects.Instance}
991 @param instance: the instance definition
994 hyper = hypervisor.GetHypervisor(instance.hypervisor)
996 info = hyper.MigrationInfo(instance)
997 except errors.HypervisorError, err:
998 msg = "Failed to fetch migration information"
999 logging.exception(msg)
1000 return (False, '%s: %s' % (msg, err))
1004 def AcceptInstance(instance, info, target):
1005 """Prepare the node to accept an instance.
1007 @type instance: L{objects.Instance}
1008 @param instance: the instance definition
1009 @type info: string/data (opaque)
1010 @param info: migration information, from the source node
1011 @type target: string
1012 @param target: target host (usually ip), on this node
1015 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1017 hyper.AcceptInstance(instance, info, target)
1018 except errors.HypervisorError, err:
1019 msg = "Failed to accept instance"
1020 logging.exception(msg)
1021 return (False, '%s: %s' % (msg, err))
1022 return (True, "Accept successfull")
1025 def FinalizeMigration(instance, info, success):
1026 """Finalize any preparation to accept an instance.
1028 @type instance: L{objects.Instance}
1029 @param instance: the instance definition
1030 @type info: string/data (opaque)
1031 @param info: migration information, from the source node
1032 @type success: boolean
1033 @param success: whether the migration was a success or a failure
1036 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1038 hyper.FinalizeMigration(instance, info, success)
1039 except errors.HypervisorError, err:
1040 msg = "Failed to finalize migration"
1041 logging.exception(msg)
1042 return (False, '%s: %s' % (msg, err))
1043 return (True, "Migration Finalized")
1046 def MigrateInstance(instance, target, live):
1047 """Migrates an instance to another node.
1049 @type instance: L{objects.Instance}
1050 @param instance: the instance definition
1051 @type target: string
1052 @param target: the target node name
1054 @param live: whether the migration should be done live or not (the
1055 interpretation of this parameter is left to the hypervisor)
1057 @return: a tuple of (success, msg) where:
1058 - succes is a boolean denoting the success/failure of the operation
1059 - msg is a string with details in case of failure
1062 hyper = hypervisor.GetHypervisor(instance.hypervisor)
1065 hyper.MigrateInstance(instance.name, target, live)
1066 except errors.HypervisorError, err:
1067 msg = "Failed to migrate instance"
1068 logging.exception(msg)
1069 return (False, "%s: %s" % (msg, err))
1070 return (True, "Migration successfull")
1073 def BlockdevCreate(disk, size, owner, on_primary, info):
1074 """Creates a block device for an instance.
1076 @type disk: L{objects.Disk}
1077 @param disk: the object describing the disk we should create
1079 @param size: the size of the physical underlying device, in MiB
1081 @param owner: the name of the instance for which disk is created,
1082 used for device cache data
1083 @type on_primary: boolean
1084 @param on_primary: indicates if it is the primary node or not
1086 @param info: string that will be sent to the physical device
1087 creation, used for example to set (LVM) tags on LVs
1089 @return: the new unique_id of the device (this can sometime be
1090 computed only after creation), or None. On secondary nodes,
1091 it's not required to return anything.
1096 for child in disk.children:
1097 crdev = _RecursiveAssembleBD(child, owner, on_primary)
1098 if on_primary or disk.AssembleOnSecondary():
1099 # we need the children open in case the device itself has to
1105 device = bdev.Create(disk.dev_type, disk.physical_id, clist, size)
1106 except errors.GenericError, err:
1107 return False, "Can't create block device: %s" % str(err)
1109 if on_primary or disk.AssembleOnSecondary():
1110 if not device.Assemble():
1111 errorstring = "Can't assemble device after creation, very unusual event"
1112 logging.error(errorstring)
1113 return False, errorstring
1114 device.SetSyncSpeed(constants.SYNC_SPEED)
1115 if on_primary or disk.OpenOnSecondary():
1116 device.Open(force=True)
1117 DevCacheManager.UpdateCache(device.dev_path, owner,
1118 on_primary, disk.iv_name)
1120 device.SetInfo(info)
1122 physical_id = device.unique_id
1123 return True, physical_id
1126 def BlockdevRemove(disk):
1127 """Remove a block device.
1129 @note: This is intended to be called recursively.
1131 @type disk: L{objects.Disk}
1132 @param disk: the disk object we should remove
1134 @return: the success of the operation
1138 rdev = _RecursiveFindBD(disk)
1139 except errors.BlockDeviceError, err:
1140 # probably can't attach
1141 logging.info("Can't attach to device %s in remove", disk)
1143 if rdev is not None:
1144 r_path = rdev.dev_path
1145 result = rdev.Remove()
1147 DevCacheManager.RemoveCache(r_path)
1151 for child in disk.children:
1152 result = result and BlockdevRemove(child)
1156 def _RecursiveAssembleBD(disk, owner, as_primary):
1157 """Activate a block device for an instance.
1159 This is run on the primary and secondary nodes for an instance.
1161 @note: this function is called recursively.
1163 @type disk: L{objects.Disk}
1164 @param disk: the disk we try to assemble
1166 @param owner: the name of the instance which owns the disk
1167 @type as_primary: boolean
1168 @param as_primary: if we should make the block device
1171 @return: the assembled device or None (in case no device
1173 @raise errors.BlockDeviceError: in case there is an error
1174 during the activation of the children or the device
1180 mcn = disk.ChildrenNeeded()
1182 mcn = 0 # max number of Nones allowed
1184 mcn = len(disk.children) - mcn # max number of Nones
1185 for chld_disk in disk.children:
1187 cdev = _RecursiveAssembleBD(chld_disk, owner, as_primary)
1188 except errors.BlockDeviceError, err:
1189 if children.count(None) >= mcn:
1192 logging.error("Error in child activation: %s", str(err))
1193 children.append(cdev)
1195 if as_primary or disk.AssembleOnSecondary():
1196 r_dev = bdev.Assemble(disk.dev_type, disk.physical_id, children)
1197 r_dev.SetSyncSpeed(constants.SYNC_SPEED)
1199 if as_primary or disk.OpenOnSecondary():
1201 DevCacheManager.UpdateCache(r_dev.dev_path, owner,
1202 as_primary, disk.iv_name)
1209 def BlockdevAssemble(disk, owner, as_primary):
1210 """Activate a block device for an instance.
1212 This is a wrapper over _RecursiveAssembleBD.
1214 @rtype: str or boolean
1215 @return: a C{/dev/...} path for primary nodes, and
1216 C{True} for secondary nodes
1220 result = "no error information"
1222 result = _RecursiveAssembleBD(disk, owner, as_primary)
1223 if isinstance(result, bdev.BlockDev):
1224 result = result.dev_path
1228 except errors.BlockDeviceError, err:
1229 result = "Error while assembling disk: %s" % str(err)
1230 return (status, result)
1233 def BlockdevShutdown(disk):
1234 """Shut down a block device.
1236 First, if the device is assembled (Attach() is successfull), then
1237 the device is shutdown. Then the children of the device are
1240 This function is called recursively. Note that we don't cache the
1241 children or such, as oppossed to assemble, shutdown of different
1242 devices doesn't require that the upper device was active.
1244 @type disk: L{objects.Disk}
1245 @param disk: the description of the disk we should
1248 @return: the success of the operation
1253 r_dev = _RecursiveFindBD(disk)
1254 if r_dev is not None:
1255 r_path = r_dev.dev_path
1258 DevCacheManager.RemoveCache(r_path)
1259 except errors.BlockDeviceError, err:
1260 msgs.append(str(err))
1264 for child in disk.children:
1265 c_status, c_msg = BlockdevShutdown(child)
1266 result = result and c_status
1267 if c_msg: # not an empty message
1270 return (result, "; ".join(msgs))
1273 def BlockdevAddchildren(parent_cdev, new_cdevs):
1274 """Extend a mirrored block device.
1276 @type parent_cdev: L{objects.Disk}
1277 @param parent_cdev: the disk to which we should add children
1278 @type new_cdevs: list of L{objects.Disk}
1279 @param new_cdevs: the list of children which we should add
1281 @return: the success of the operation
1284 parent_bdev = _RecursiveFindBD(parent_cdev)
1285 if parent_bdev is None:
1286 logging.error("Can't find parent device")
1288 new_bdevs = [_RecursiveFindBD(disk) for disk in new_cdevs]
1289 if new_bdevs.count(None) > 0:
1290 logging.error("Can't find new device(s) to add: %s:%s",
1291 new_bdevs, new_cdevs)
1293 parent_bdev.AddChildren(new_bdevs)
1297 def BlockdevRemovechildren(parent_cdev, new_cdevs):
1298 """Shrink a mirrored block device.
1300 @type parent_cdev: L{objects.Disk}
1301 @param parent_cdev: the disk from which we should remove children
1302 @type new_cdevs: list of L{objects.Disk}
1303 @param new_cdevs: the list of children which we should remove
1305 @return: the success of the operation
1308 parent_bdev = _RecursiveFindBD(parent_cdev)
1309 if parent_bdev is None:
1310 logging.error("Can't find parent in remove children: %s", parent_cdev)
1313 for disk in new_cdevs:
1314 rpath = disk.StaticDevPath()
1316 bd = _RecursiveFindBD(disk)
1318 logging.error("Can't find dynamic device %s while removing children",
1322 devs.append(bd.dev_path)
1325 parent_bdev.RemoveChildren(devs)
1329 def BlockdevGetmirrorstatus(disks):
1330 """Get the mirroring status of a list of devices.
1332 @type disks: list of L{objects.Disk}
1333 @param disks: the list of disks which we should query
1336 a list of (mirror_done, estimated_time) tuples, which
1337 are the result of L{bdev.BlockDev.CombinedSyncStatus}
1338 @raise errors.BlockDeviceError: if any of the disks cannot be
1344 rbd = _RecursiveFindBD(dsk)
1346 raise errors.BlockDeviceError("Can't find device %s" % str(dsk))
1347 stats.append(rbd.CombinedSyncStatus())
1351 def _RecursiveFindBD(disk):
1352 """Check if a device is activated.
1354 If so, return informations about the real device.
1356 @type disk: L{objects.Disk}
1357 @param disk: the disk object we need to find
1359 @return: None if the device can't be found,
1360 otherwise the device instance
1365 for chdisk in disk.children:
1366 children.append(_RecursiveFindBD(chdisk))
1368 return bdev.FindDevice(disk.dev_type, disk.physical_id, children)
1371 def BlockdevFind(disk):
1372 """Check if a device is activated.
1374 If it is, return informations about the real device.
1376 @type disk: L{objects.Disk}
1377 @param disk: the disk to find
1378 @rtype: None or tuple
1379 @return: None if the disk cannot be found, otherwise a
1380 tuple (device_path, major, minor, sync_percent,
1381 estimated_time, is_degraded)
1385 rbd = _RecursiveFindBD(disk)
1386 except errors.BlockDeviceError, err:
1387 return (False, str(err))
1390 return (True, (rbd.dev_path, rbd.major, rbd.minor) + rbd.GetSyncStatus())
1393 def UploadFile(file_name, data, mode, uid, gid, atime, mtime):
1394 """Write a file to the filesystem.
1396 This allows the master to overwrite(!) a file. It will only perform
1397 the operation if the file belongs to a list of configuration files.
1399 @type file_name: str
1400 @param file_name: the target file name
1402 @param data: the new contents of the file
1404 @param mode: the mode to give the file (can be None)
1406 @param uid: the owner of the file (can be -1 for default)
1408 @param gid: the group of the file (can be -1 for default)
1410 @param atime: the atime to set on the file (can be None)
1412 @param mtime: the mtime to set on the file (can be None)
1414 @return: the success of the operation; errors are logged
1415 in the node daemon log
1418 if not os.path.isabs(file_name):
1419 logging.error("Filename passed to UploadFile is not absolute: '%s'",
1424 constants.CLUSTER_CONF_FILE,
1425 constants.ETC_HOSTS,
1426 constants.SSH_KNOWN_HOSTS_FILE,
1427 constants.VNC_PASSWORD_FILE,
1430 if file_name not in allowed_files:
1431 logging.error("Filename passed to UploadFile not in allowed"
1432 " upload targets: '%s'", file_name)
1435 raw_data = _Decompress(data)
1437 utils.WriteFile(file_name, data=raw_data, mode=mode, uid=uid, gid=gid,
1438 atime=atime, mtime=mtime)
1442 def WriteSsconfFiles(values):
1443 """Update all ssconf files.
1445 Wrapper around the SimpleStore.WriteFiles.
1448 ssconf.SimpleStore().WriteFiles(values)
1451 def _ErrnoOrStr(err):
1452 """Format an EnvironmentError exception.
1454 If the L{err} argument has an errno attribute, it will be looked up
1455 and converted into a textual C{E...} description. Otherwise the
1456 string representation of the error will be returned.
1458 @type err: L{EnvironmentError}
1459 @param err: the exception to format
1462 if hasattr(err, 'errno'):
1463 detail = errno.errorcode[err.errno]
1469 def _OSOndiskVersion(name, os_dir):
1470 """Compute and return the API version of a given OS.
1472 This function will try to read the API version of the OS given by
1473 the 'name' parameter and residing in the 'os_dir' directory.
1476 @param name: the OS name we should look for
1478 @param os_dir: the directory inwhich we should look for the OS
1481 Either an integer denoting the version or None in the
1482 case when this is not a valid OS name.
1483 @raise errors.InvalidOS: if the OS cannot be found
1486 api_file = os.path.sep.join([os_dir, "ganeti_api_version"])
1489 st = os.stat(api_file)
1490 except EnvironmentError, err:
1491 raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file not"
1492 " found (%s)" % _ErrnoOrStr(err))
1494 if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
1495 raise errors.InvalidOS(name, os_dir, "'ganeti_api_version' file is not"
1501 api_versions = f.readlines()
1504 except EnvironmentError, err:
1505 raise errors.InvalidOS(name, os_dir, "error while reading the"
1506 " API version (%s)" % _ErrnoOrStr(err))
1508 api_versions = [version.strip() for version in api_versions]
1510 api_versions = [int(version) for version in api_versions]
1511 except (TypeError, ValueError), err:
1512 raise errors.InvalidOS(name, os_dir,
1513 "API version is not integer (%s)" % str(err))
1518 def DiagnoseOS(top_dirs=None):
1519 """Compute the validity for all OSes.
1521 @type top_dirs: list
1522 @param top_dirs: the list of directories in which to
1523 search (if not given defaults to
1524 L{constants.OS_SEARCH_PATH})
1525 @rtype: list of L{objects.OS}
1526 @return: an OS object for each name in all the given
1530 if top_dirs is None:
1531 top_dirs = constants.OS_SEARCH_PATH
1534 for dir_name in top_dirs:
1535 if os.path.isdir(dir_name):
1537 f_names = utils.ListVisibleFiles(dir_name)
1538 except EnvironmentError, err:
1539 logging.exception("Can't list the OS directory %s", dir_name)
1541 for name in f_names:
1543 os_inst = OSFromDisk(name, base_dir=dir_name)
1544 result.append(os_inst)
1545 except errors.InvalidOS, err:
1546 result.append(objects.OS.FromInvalidOS(err))
1551 def OSFromDisk(name, base_dir=None):
1552 """Create an OS instance from disk.
1554 This function will return an OS instance if the given name is a
1555 valid OS name. Otherwise, it will raise an appropriate
1556 L{errors.InvalidOS} exception, detailing why this is not a valid OS.
1558 @type base_dir: string
1559 @keyword base_dir: Base directory containing OS installations.
1560 Defaults to a search in all the OS_SEARCH_PATH dirs.
1561 @rtype: L{objects.OS}
1562 @return: the OS instance if we find a valid one
1563 @raise errors.InvalidOS: if we don't find a valid OS
1566 if base_dir is None:
1567 os_dir = utils.FindFile(name, constants.OS_SEARCH_PATH, os.path.isdir)
1569 raise errors.InvalidOS(name, None, "OS dir not found in search path")
1571 os_dir = os.path.sep.join([base_dir, name])
1573 api_versions = _OSOndiskVersion(name, os_dir)
1575 if constants.OS_API_VERSION not in api_versions:
1576 raise errors.InvalidOS(name, os_dir, "API version mismatch"
1577 " (found %s want %s)"
1578 % (api_versions, constants.OS_API_VERSION))
1580 # OS Scripts dictionary, we will populate it with the actual script names
1581 os_scripts = dict.fromkeys(constants.OS_SCRIPTS)
1583 for script in os_scripts:
1584 os_scripts[script] = os.path.sep.join([os_dir, script])
1587 st = os.stat(os_scripts[script])
1588 except EnvironmentError, err:
1589 raise errors.InvalidOS(name, os_dir, "'%s' script missing (%s)" %
1590 (script, _ErrnoOrStr(err)))
1592 if stat.S_IMODE(st.st_mode) & stat.S_IXUSR != stat.S_IXUSR:
1593 raise errors.InvalidOS(name, os_dir, "'%s' script not executable" %
1596 if not stat.S_ISREG(stat.S_IFMT(st.st_mode)):
1597 raise errors.InvalidOS(name, os_dir, "'%s' is not a regular file" %
1601 return objects.OS(name=name, path=os_dir, status=constants.OS_VALID_STATUS,
1602 create_script=os_scripts[constants.OS_SCRIPT_CREATE],
1603 export_script=os_scripts[constants.OS_SCRIPT_EXPORT],
1604 import_script=os_scripts[constants.OS_SCRIPT_IMPORT],
1605 rename_script=os_scripts[constants.OS_SCRIPT_RENAME],
1606 api_versions=api_versions)
1608 def OSEnvironment(instance, debug=0):
1609 """Calculate the environment for an os script.
1611 @type instance: L{objects.Instance}
1612 @param instance: target instance for the os script run
1613 @type debug: integer
1614 @param debug: debug level (0 or 1, for OS Api 10)
1616 @return: dict of environment variables
1617 @raise errors.BlockDeviceError: if the block device
1622 result['OS_API_VERSION'] = '%d' % constants.OS_API_VERSION
1623 result['INSTANCE_NAME'] = instance.name
1624 result['INSTANCE_OS'] = instance.os
1625 result['HYPERVISOR'] = instance.hypervisor
1626 result['DISK_COUNT'] = '%d' % len(instance.disks)
1627 result['NIC_COUNT'] = '%d' % len(instance.nics)
1628 result['DEBUG_LEVEL'] = '%d' % debug
1629 for idx, disk in enumerate(instance.disks):
1630 real_disk = _RecursiveFindBD(disk)
1631 if real_disk is None:
1632 raise errors.BlockDeviceError("Block device '%s' is not set up" %
1635 result['DISK_%d_PATH' % idx] = real_disk.dev_path
1636 # FIXME: When disks will have read-only mode, populate this
1637 result['DISK_%d_ACCESS' % idx] = disk.mode
1638 if constants.HV_DISK_TYPE in instance.hvparams:
1639 result['DISK_%d_FRONTEND_TYPE' % idx] = \
1640 instance.hvparams[constants.HV_DISK_TYPE]
1641 if disk.dev_type in constants.LDS_BLOCK:
1642 result['DISK_%d_BACKEND_TYPE' % idx] = 'block'
1643 elif disk.dev_type == constants.LD_FILE:
1644 result['DISK_%d_BACKEND_TYPE' % idx] = \
1645 'file:%s' % disk.physical_id[0]
1646 for idx, nic in enumerate(instance.nics):
1647 result['NIC_%d_MAC' % idx] = nic.mac
1649 result['NIC_%d_IP' % idx] = nic.ip
1650 result['NIC_%d_BRIDGE' % idx] = nic.bridge
1651 if constants.HV_NIC_TYPE in instance.hvparams:
1652 result['NIC_%d_FRONTEND_TYPE' % idx] = \
1653 instance.hvparams[constants.HV_NIC_TYPE]
1657 def BlockdevGrow(disk, amount):
1658 """Grow a stack of block devices.
1660 This function is called recursively, with the childrens being the
1661 first ones to resize.
1663 @type disk: L{objects.Disk}
1664 @param disk: the disk to be grown
1665 @rtype: (status, result)
1666 @return: a tuple with the status of the operation
1667 (True/False), and the errors message if status
1671 r_dev = _RecursiveFindBD(disk)
1673 return False, "Cannot find block device %s" % (disk,)
1677 except errors.BlockDeviceError, err:
1678 return False, str(err)
1683 def BlockdevSnapshot(disk):
1684 """Create a snapshot copy of a block device.
1686 This function is called recursively, and the snapshot is actually created
1687 just for the leaf lvm backend device.
1689 @type disk: L{objects.Disk}
1690 @param disk: the disk to be snapshotted
1692 @return: snapshot disk path
1696 if len(disk.children) == 1:
1697 # only one child, let's recurse on it
1698 return BlockdevSnapshot(disk.children[0])
1700 # more than one child, choose one that matches
1701 for child in disk.children:
1702 if child.size == disk.size:
1703 # return implies breaking the loop
1704 return BlockdevSnapshot(child)
1705 elif disk.dev_type == constants.LD_LV:
1706 r_dev = _RecursiveFindBD(disk)
1707 if r_dev is not None:
1708 # let's stay on the safe side and ask for the full size, for now
1709 return r_dev.Snapshot(disk.size)
1713 raise errors.ProgrammerError("Cannot snapshot non-lvm block device"
1714 " '%s' of type '%s'" %
1715 (disk.unique_id, disk.dev_type))
1718 def ExportSnapshot(disk, dest_node, instance, cluster_name, idx):
1719 """Export a block device snapshot to a remote node.
1721 @type disk: L{objects.Disk}
1722 @param disk: the description of the disk to export
1723 @type dest_node: str
1724 @param dest_node: the destination node to export to
1725 @type instance: L{objects.Instance}
1726 @param instance: the instance object to whom the disk belongs
1727 @type cluster_name: str
1728 @param cluster_name: the cluster name, needed for SSH hostalias
1730 @param idx: the index of the disk in the instance's disk list,
1731 used to export to the OS scripts environment
1733 @return: the success of the operation
1736 export_env = OSEnvironment(instance)
1738 inst_os = OSFromDisk(instance.os)
1739 export_script = inst_os.export_script
1741 logfile = "%s/exp-%s-%s-%s.log" % (constants.LOG_OS_DIR, inst_os.name,
1742 instance.name, int(time.time()))
1743 if not os.path.exists(constants.LOG_OS_DIR):
1744 os.mkdir(constants.LOG_OS_DIR, 0750)
1745 real_disk = _RecursiveFindBD(disk)
1746 if real_disk is None:
1747 raise errors.BlockDeviceError("Block device '%s' is not set up" %
1751 export_env['EXPORT_DEVICE'] = real_disk.dev_path
1752 export_env['EXPORT_INDEX'] = str(idx)
1754 destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
1755 destfile = disk.physical_id[1]
1757 # the target command is built out of three individual commands,
1758 # which are joined by pipes; we check each individual command for
1760 expcmd = utils.BuildShellCmd("cd %s; %s 2>%s", inst_os.path,
1761 export_script, logfile)
1765 destcmd = utils.BuildShellCmd("mkdir -p %s && cat > %s/%s",
1766 destdir, destdir, destfile)
1767 remotecmd = _GetSshRunner(cluster_name).BuildCmd(dest_node,
1768 constants.GANETI_RUNAS,
1771 # all commands have been checked, so we're safe to combine them
1772 command = '|'.join([expcmd, comprcmd, utils.ShellQuoteArgs(remotecmd)])
1774 result = utils.RunCmd(command, env=export_env)
1777 logging.error("os snapshot export command '%s' returned error: %s"
1778 " output: %s", command, result.fail_reason, result.output)
1784 def FinalizeExport(instance, snap_disks):
1785 """Write out the export configuration information.
1787 @type instance: L{objects.Instance}
1788 @param instance: the instance which we export, used for
1789 saving configuration
1790 @type snap_disks: list of L{objects.Disk}
1791 @param snap_disks: list of snapshot block devices, which
1792 will be used to get the actual name of the dump file
1795 @return: the success of the operation
1798 destdir = os.path.join(constants.EXPORT_DIR, instance.name + ".new")
1799 finaldestdir = os.path.join(constants.EXPORT_DIR, instance.name)
1801 config = objects.SerializableConfigParser()
1803 config.add_section(constants.INISECT_EXP)
1804 config.set(constants.INISECT_EXP, 'version', '0')
1805 config.set(constants.INISECT_EXP, 'timestamp', '%d' % int(time.time()))
1806 config.set(constants.INISECT_EXP, 'source', instance.primary_node)
1807 config.set(constants.INISECT_EXP, 'os', instance.os)
1808 config.set(constants.INISECT_EXP, 'compression', 'gzip')
1810 config.add_section(constants.INISECT_INS)
1811 config.set(constants.INISECT_INS, 'name', instance.name)
1812 config.set(constants.INISECT_INS, 'memory', '%d' %
1813 instance.beparams[constants.BE_MEMORY])
1814 config.set(constants.INISECT_INS, 'vcpus', '%d' %
1815 instance.beparams[constants.BE_VCPUS])
1816 config.set(constants.INISECT_INS, 'disk_template', instance.disk_template)
1819 for nic_count, nic in enumerate(instance.nics):
1821 config.set(constants.INISECT_INS, 'nic%d_mac' %
1822 nic_count, '%s' % nic.mac)
1823 config.set(constants.INISECT_INS, 'nic%d_ip' % nic_count, '%s' % nic.ip)
1824 config.set(constants.INISECT_INS, 'nic%d_bridge' % nic_count,
1826 # TODO: redundant: on load can read nics until it doesn't exist
1827 config.set(constants.INISECT_INS, 'nic_count' , '%d' % nic_total)
1830 for disk_count, disk in enumerate(snap_disks):
1833 config.set(constants.INISECT_INS, 'disk%d_ivname' % disk_count,
1834 ('%s' % disk.iv_name))
1835 config.set(constants.INISECT_INS, 'disk%d_dump' % disk_count,
1836 ('%s' % disk.physical_id[1]))
1837 config.set(constants.INISECT_INS, 'disk%d_size' % disk_count,
1840 config.set(constants.INISECT_INS, 'disk_count' , '%d' % disk_total)
1842 utils.WriteFile(os.path.join(destdir, constants.EXPORT_CONF_FILE),
1843 data=config.Dumps())
1844 shutil.rmtree(finaldestdir, True)
1845 shutil.move(destdir, finaldestdir)
1850 def ExportInfo(dest):
1851 """Get export configuration information.
1854 @param dest: directory containing the export
1856 @rtype: L{objects.SerializableConfigParser}
1857 @return: a serializable config file containing the
1861 cff = os.path.join(dest, constants.EXPORT_CONF_FILE)
1863 config = objects.SerializableConfigParser()
1866 if (not config.has_section(constants.INISECT_EXP) or
1867 not config.has_section(constants.INISECT_INS)):
1873 def ImportOSIntoInstance(instance, src_node, src_images, cluster_name):
1874 """Import an os image into an instance.
1876 @type instance: L{objects.Instance}
1877 @param instance: instance to import the disks into
1878 @type src_node: string
1879 @param src_node: source node for the disk images
1880 @type src_images: list of string
1881 @param src_images: absolute paths of the disk images
1882 @rtype: list of boolean
1883 @return: each boolean represent the success of importing the n-th disk
1886 import_env = OSEnvironment(instance)
1887 inst_os = OSFromDisk(instance.os)
1888 import_script = inst_os.import_script
1890 logfile = "%s/import-%s-%s-%s.log" % (constants.LOG_OS_DIR, instance.os,
1891 instance.name, int(time.time()))
1892 if not os.path.exists(constants.LOG_OS_DIR):
1893 os.mkdir(constants.LOG_OS_DIR, 0750)
1896 impcmd = utils.BuildShellCmd("(cd %s; %s >%s 2>&1)", inst_os.path,
1897 import_script, logfile)
1900 for idx, image in enumerate(src_images):
1902 destcmd = utils.BuildShellCmd('cat %s', image)
1903 remotecmd = _GetSshRunner(cluster_name).BuildCmd(src_node,
1904 constants.GANETI_RUNAS,
1906 command = '|'.join([utils.ShellQuoteArgs(remotecmd), comprcmd, impcmd])
1907 import_env['IMPORT_DEVICE'] = import_env['DISK_%d_PATH' % idx]
1908 import_env['IMPORT_INDEX'] = str(idx)
1909 result = utils.RunCmd(command, env=import_env)
1911 logging.error("Disk import command '%s' returned error: %s"
1912 " output: %s", command, result.fail_reason,
1914 final_result.append(False)
1916 final_result.append(True)
1918 final_result.append(True)
1924 """Return a list of exports currently available on this machine.
1927 @return: list of the exports
1930 if os.path.isdir(constants.EXPORT_DIR):
1931 return utils.ListVisibleFiles(constants.EXPORT_DIR)
1936 def RemoveExport(export):
1937 """Remove an existing export from the node.
1940 @param export: the name of the export to remove
1942 @return: the success of the operation
1945 target = os.path.join(constants.EXPORT_DIR, export)
1947 shutil.rmtree(target)
1948 # TODO: catch some of the relevant exceptions and provide a pretty
1949 # error message if rmtree fails.
1954 def BlockdevRename(devlist):
1955 """Rename a list of block devices.
1957 @type devlist: list of tuples
1958 @param devlist: list of tuples of the form (disk,
1959 new_logical_id, new_physical_id); disk is an
1960 L{objects.Disk} object describing the current disk,
1961 and new logical_id/physical_id is the name we
1964 @return: True if all renames succeeded, False otherwise
1968 for disk, unique_id in devlist:
1969 dev = _RecursiveFindBD(disk)
1974 old_rpath = dev.dev_path
1975 dev.Rename(unique_id)
1976 new_rpath = dev.dev_path
1977 if old_rpath != new_rpath:
1978 DevCacheManager.RemoveCache(old_rpath)
1979 # FIXME: we should add the new cache information here, like:
1980 # DevCacheManager.UpdateCache(new_rpath, owner, ...)
1981 # but we don't have the owner here - maybe parse from existing
1982 # cache? for now, we only lose lvm data when we rename, which
1983 # is less critical than DRBD or MD
1984 except errors.BlockDeviceError, err:
1985 logging.exception("Can't rename device '%s' to '%s'", dev, unique_id)
1990 def _TransformFileStorageDir(file_storage_dir):
1991 """Checks whether given file_storage_dir is valid.
1993 Checks wheter the given file_storage_dir is within the cluster-wide
1994 default file_storage_dir stored in SimpleStore. Only paths under that
1995 directory are allowed.
1997 @type file_storage_dir: str
1998 @param file_storage_dir: the path to check
2000 @return: the normalized path if valid, None otherwise
2004 file_storage_dir = os.path.normpath(file_storage_dir)
2005 base_file_storage_dir = cfg.GetFileStorageDir()
2006 if (not os.path.commonprefix([file_storage_dir, base_file_storage_dir]) ==
2007 base_file_storage_dir):
2008 logging.error("file storage directory '%s' is not under base file"
2009 " storage directory '%s'",
2010 file_storage_dir, base_file_storage_dir)
2012 return file_storage_dir
2015 def CreateFileStorageDir(file_storage_dir):
2016 """Create file storage directory.
2018 @type file_storage_dir: str
2019 @param file_storage_dir: directory to create
2022 @return: tuple with first element a boolean indicating wheter dir
2023 creation was successful or not
2026 file_storage_dir = _TransformFileStorageDir(file_storage_dir)
2028 if not file_storage_dir:
2031 if os.path.exists(file_storage_dir):
2032 if not os.path.isdir(file_storage_dir):
2033 logging.error("'%s' is not a directory", file_storage_dir)
2037 os.makedirs(file_storage_dir, 0750)
2038 except OSError, err:
2039 logging.error("Cannot create file storage directory '%s': %s",
2040 file_storage_dir, err)
2045 def RemoveFileStorageDir(file_storage_dir):
2046 """Remove file storage directory.
2048 Remove it only if it's empty. If not log an error and return.
2050 @type file_storage_dir: str
2051 @param file_storage_dir: the directory we should cleanup
2052 @rtype: tuple (success,)
2053 @return: tuple of one element, C{success}, denoting
2054 whether the operation was successfull
2057 file_storage_dir = _TransformFileStorageDir(file_storage_dir)
2059 if not file_storage_dir:
2062 if os.path.exists(file_storage_dir):
2063 if not os.path.isdir(file_storage_dir):
2064 logging.error("'%s' is not a directory", file_storage_dir)
2066 # deletes dir only if empty, otherwise we want to return False
2068 os.rmdir(file_storage_dir)
2069 except OSError, err:
2070 logging.exception("Cannot remove file storage directory '%s'",
2076 def RenameFileStorageDir(old_file_storage_dir, new_file_storage_dir):
2077 """Rename the file storage directory.
2079 @type old_file_storage_dir: str
2080 @param old_file_storage_dir: the current path
2081 @type new_file_storage_dir: str
2082 @param new_file_storage_dir: the name we should rename to
2083 @rtype: tuple (success,)
2084 @return: tuple of one element, C{success}, denoting
2085 whether the operation was successful
2088 old_file_storage_dir = _TransformFileStorageDir(old_file_storage_dir)
2089 new_file_storage_dir = _TransformFileStorageDir(new_file_storage_dir)
2091 if not old_file_storage_dir or not new_file_storage_dir:
2094 if not os.path.exists(new_file_storage_dir):
2095 if os.path.isdir(old_file_storage_dir):
2097 os.rename(old_file_storage_dir, new_file_storage_dir)
2098 except OSError, err:
2099 logging.exception("Cannot rename '%s' to '%s'",
2100 old_file_storage_dir, new_file_storage_dir)
2103 logging.error("'%s' is not a directory", old_file_storage_dir)
2106 if os.path.exists(old_file_storage_dir):
2107 logging.error("Cannot rename '%s' to '%s'. Both locations exist.",
2108 old_file_storage_dir, new_file_storage_dir)
2113 def _IsJobQueueFile(file_name):
2114 """Checks whether the given filename is in the queue directory.
2116 @type file_name: str
2117 @param file_name: the file name we should check
2119 @return: whether the file is under the queue directory
2122 queue_dir = os.path.normpath(constants.QUEUE_DIR)
2123 result = (os.path.commonprefix([queue_dir, file_name]) == queue_dir)
2126 logging.error("'%s' is not a file in the queue directory",
2132 def JobQueueUpdate(file_name, content):
2133 """Updates a file in the queue directory.
2135 This is just a wrapper over L{utils.WriteFile}, with proper
2138 @type file_name: str
2139 @param file_name: the job file name
2141 @param content: the new job contents
2143 @return: the success of the operation
2146 if not _IsJobQueueFile(file_name):
2149 # Write and replace the file atomically
2150 utils.WriteFile(file_name, data=_Decompress(content))
2155 def JobQueueRename(old, new):
2156 """Renames a job queue file.
2158 This is just a wrapper over os.rename with proper checking.
2161 @param old: the old (actual) file name
2163 @param new: the desired file name
2165 @return: the success of the operation
2168 if not (_IsJobQueueFile(old) and _IsJobQueueFile(new)):
2171 utils.RenameFile(old, new, mkdir=True)
2176 def JobQueueSetDrainFlag(drain_flag):
2177 """Set the drain flag for the queue.
2179 This will set or unset the queue drain flag.
2181 @type drain_flag: boolean
2182 @param drain_flag: if True, will set the drain flag, otherwise reset it.
2184 @return: always True
2185 @warning: the function always returns True
2189 utils.WriteFile(constants.JOB_QUEUE_DRAIN_FILE, data="", close=True)
2191 utils.RemoveFile(constants.JOB_QUEUE_DRAIN_FILE)
2196 def BlockdevClose(instance_name, disks):
2197 """Closes the given block devices.
2199 This means they will be switched to secondary mode (in case of
2202 @param instance_name: if the argument is not empty, the symlinks
2203 of this instance will be removed
2204 @type disks: list of L{objects.Disk}
2205 @param disks: the list of disks to be closed
2206 @rtype: tuple (success, message)
2207 @return: a tuple of success and message, where success
2208 indicates the succes of the operation, and message
2209 which will contain the error details in case we
2215 rd = _RecursiveFindBD(cf)
2217 return (False, "Can't find device %s" % cf)
2224 except errors.BlockDeviceError, err:
2225 msg.append(str(err))
2227 return (False, "Can't make devices secondary: %s" % ",".join(msg))
2230 _RemoveBlockDevLinks(instance_name, disks)
2231 return (True, "All devices secondary")
2234 def ValidateHVParams(hvname, hvparams):
2235 """Validates the given hypervisor parameters.
2237 @type hvname: string
2238 @param hvname: the hypervisor name
2239 @type hvparams: dict
2240 @param hvparams: the hypervisor parameters to be validated
2241 @rtype: tuple (success, message)
2242 @return: a tuple of success and message, where success
2243 indicates the succes of the operation, and message
2244 which will contain the error details in case we
2249 hv_type = hypervisor.GetHypervisor(hvname)
2250 hv_type.ValidateParameters(hvparams)
2251 return (True, "Validation passed")
2252 except errors.HypervisorError, err:
2253 return (False, str(err))
2257 """Demotes the current node from master candidate role.
2260 # try to ensure we're not the master by mistake
2261 master, myself = ssconf.GetMasterAndMyself()
2262 if master == myself:
2263 return (False, "ssconf status shows I'm the master node, will not demote")
2264 pid_file = utils.DaemonPidFileName(constants.MASTERD_PID)
2265 if utils.IsProcessAlive(utils.ReadPidFile(pid_file)):
2266 return (False, "The master daemon is running, will not demote")
2268 utils.CreateBackup(constants.CLUSTER_CONF_FILE)
2269 except EnvironmentError, err:
2270 if err.errno != errno.ENOENT:
2271 return (False, "Error while backing up cluster file: %s" % str(err))
2272 utils.RemoveFile(constants.CLUSTER_CONF_FILE)
2273 return (True, "Done")
2276 def _FindDisks(nodes_ip, disks):
2277 """Sets the physical ID on disks and returns the block devices.
2280 # set the correct physical ID
2281 my_name = utils.HostInfo().name
2283 cf.SetPhysicalID(my_name, nodes_ip)
2288 rd = _RecursiveFindBD(cf)
2290 return (False, "Can't find device %s" % cf)
2292 return (True, bdevs)
2295 def DrbdDisconnectNet(nodes_ip, disks):
2296 """Disconnects the network on a list of drbd devices.
2299 status, bdevs = _FindDisks(nodes_ip, disks)
2301 return status, bdevs
2307 except errors.BlockDeviceError, err:
2308 logging.exception("Failed to go into standalone mode")
2309 return (False, "Can't change network configuration: %s" % str(err))
2310 return (True, "All disks are now disconnected")
2313 def DrbdAttachNet(nodes_ip, disks, instance_name, multimaster):
2314 """Attaches the network on a list of drbd devices.
2317 status, bdevs = _FindDisks(nodes_ip, disks)
2319 return status, bdevs
2322 for idx, rd in enumerate(bdevs):
2324 _SymlinkBlockDev(instance_name, rd.dev_path, idx)
2325 except EnvironmentError, err:
2326 return (False, "Can't create symlink: %s" % str(err))
2327 # reconnect disks, switch to new master configuration and if
2328 # needed primary mode
2331 rd.AttachNet(multimaster)
2332 except errors.BlockDeviceError, err:
2333 return (False, "Can't change network configuration: %s" % str(err))
2334 # wait until the disks are connected; we need to retry the re-attach
2335 # if the device becomes standalone, as this might happen if the one
2336 # node disconnects and reconnects in a different mode before the
2337 # other node reconnects; in this case, one or both of the nodes will
2338 # decide it has wrong configuration and switch to standalone
2339 RECONNECT_TIMEOUT = 2 * 60
2340 sleep_time = 0.100 # start with 100 miliseconds
2341 timeout_limit = time.time() + RECONNECT_TIMEOUT
2342 while time.time() < timeout_limit:
2343 all_connected = True
2345 stats = rd.GetProcStatus()
2346 if not (stats.is_connected or stats.is_in_resync):
2347 all_connected = False
2348 if stats.is_standalone:
2349 # peer had different config info and this node became
2350 # standalone, even though this should not happen with the
2351 # new staged way of changing disk configs
2353 rd.ReAttachNet(multimaster)
2354 except errors.BlockDeviceError, err:
2355 return (False, "Can't change network configuration: %s" % str(err))
2358 time.sleep(sleep_time)
2359 sleep_time = min(5, sleep_time * 1.5)
2360 if not all_connected:
2361 return (False, "Timeout in disk reconnecting")
2363 # change to primary mode
2367 except errors.BlockDeviceError, err:
2368 return (False, "Can't change to primary mode: %s" % str(err))
2370 msg = "multi-master and primary"
2372 msg = "single-master"
2373 return (True, "Disks are now configured as %s" % msg)
2376 def DrbdWaitSync(nodes_ip, disks):
2377 """Wait until DRBDs have synchronized.
2380 status, bdevs = _FindDisks(nodes_ip, disks)
2382 return status, bdevs
2388 stats = rd.GetProcStatus()
2389 if not (stats.is_connected or stats.is_in_resync):
2392 alldone = alldone and (not stats.is_in_resync)
2393 if stats.sync_percent is not None:
2394 min_resync = min(min_resync, stats.sync_percent)
2395 return (not failure, (alldone, min_resync))
2398 class HooksRunner(object):
2401 This class is instantiated on the node side (ganeti-noded) and not
2405 RE_MASK = re.compile("^[a-zA-Z0-9_-]+$")
2407 def __init__(self, hooks_base_dir=None):
2408 """Constructor for hooks runner.
2410 @type hooks_base_dir: str or None
2411 @param hooks_base_dir: if not None, this overrides the
2412 L{constants.HOOKS_BASE_DIR} (useful for unittests)
2415 if hooks_base_dir is None:
2416 hooks_base_dir = constants.HOOKS_BASE_DIR
2417 self._BASE_DIR = hooks_base_dir
2420 def ExecHook(script, env):
2421 """Exec one hook script.
2424 @param script: the full path to the script
2426 @param env: the environment with which to exec the script
2427 @rtype: tuple (success, message)
2428 @return: a tuple of success and message, where success
2429 indicates the succes of the operation, and message
2430 which will contain the error details in case we
2434 # exec the process using subprocess and log the output
2437 fdstdin = open("/dev/null", "r")
2438 child = subprocess.Popen([script], stdin=fdstdin, stdout=subprocess.PIPE,
2439 stderr=subprocess.STDOUT, close_fds=True,
2440 shell=False, cwd="/", env=env)
2443 output = child.stdout.read(4096)
2444 child.stdout.close()
2445 except EnvironmentError, err:
2446 output += "Hook script error: %s" % str(err)
2450 result = child.wait()
2452 except EnvironmentError, err:
2453 if err.errno == errno.EINTR:
2457 # try not to leak fds
2458 for fd in (fdstdin, ):
2462 except EnvironmentError, err:
2463 # just log the error
2464 #logging.exception("Error while closing fd %s", fd)
2467 return result == 0, utils.SafeEncode(output.strip())
2469 def RunHooks(self, hpath, phase, env):
2470 """Run the scripts in the hooks directory.
2473 @param hpath: the path to the hooks directory which
2476 @param phase: either L{constants.HOOKS_PHASE_PRE} or
2477 L{constants.HOOKS_PHASE_POST}
2479 @param env: dictionary with the environment for the hook
2481 @return: list of 3-element tuples:
2483 - script result, either L{constants.HKR_SUCCESS} or
2484 L{constants.HKR_FAIL}
2485 - output of the script
2487 @raise errors.ProgrammerError: for invalid input
2491 if phase == constants.HOOKS_PHASE_PRE:
2493 elif phase == constants.HOOKS_PHASE_POST:
2496 raise errors.ProgrammerError("Unknown hooks phase: '%s'" % phase)
2499 subdir = "%s-%s.d" % (hpath, suffix)
2500 dir_name = "%s/%s" % (self._BASE_DIR, subdir)
2502 dir_contents = utils.ListVisibleFiles(dir_name)
2503 except OSError, err:
2504 # FIXME: must log output in case of failures
2507 # we use the standard python sort order,
2508 # so 00name is the recommended naming scheme
2510 for relname in dir_contents:
2511 fname = os.path.join(dir_name, relname)
2512 if not (os.path.isfile(fname) and os.access(fname, os.X_OK) and
2513 self.RE_MASK.match(relname) is not None):
2514 rrval = constants.HKR_SKIP
2517 result, output = self.ExecHook(fname, env)
2519 rrval = constants.HKR_FAIL
2521 rrval = constants.HKR_SUCCESS
2522 rr.append(("%s/%s" % (subdir, relname), rrval, output))
2527 class IAllocatorRunner(object):
2528 """IAllocator runner.
2530 This class is instantiated on the node side (ganeti-noded) and not on
2534 def Run(self, name, idata):
2535 """Run an iallocator script.
2538 @param name: the iallocator script name
2540 @param idata: the allocator input data
2543 @return: four element tuple of:
2544 - run status (one of the IARUN_ constants)
2547 - fail reason (as from L{utils.RunResult})
2550 alloc_script = utils.FindFile(name, constants.IALLOCATOR_SEARCH_PATH,
2552 if alloc_script is None:
2553 return (constants.IARUN_NOTFOUND, None, None, None)
2555 fd, fin_name = tempfile.mkstemp(prefix="ganeti-iallocator.")
2559 result = utils.RunCmd([alloc_script, fin_name])
2561 return (constants.IARUN_FAILURE, result.stdout, result.stderr,
2566 return (constants.IARUN_SUCCESS, result.stdout, result.stderr, None)
2569 class DevCacheManager(object):
2570 """Simple class for managing a cache of block device information.
2573 _DEV_PREFIX = "/dev/"
2574 _ROOT_DIR = constants.BDEV_CACHE_DIR
2577 def _ConvertPath(cls, dev_path):
2578 """Converts a /dev/name path to the cache file name.
2580 This replaces slashes with underscores and strips the /dev
2581 prefix. It then returns the full path to the cache file.
2584 @param dev_path: the C{/dev/} path name
2586 @return: the converted path name
2589 if dev_path.startswith(cls._DEV_PREFIX):
2590 dev_path = dev_path[len(cls._DEV_PREFIX):]
2591 dev_path = dev_path.replace("/", "_")
2592 fpath = "%s/bdev_%s" % (cls._ROOT_DIR, dev_path)
2596 def UpdateCache(cls, dev_path, owner, on_primary, iv_name):
2597 """Updates the cache information for a given device.
2600 @param dev_path: the pathname of the device
2602 @param owner: the owner (instance name) of the device
2603 @type on_primary: bool
2604 @param on_primary: whether this is the primary
2607 @param iv_name: the instance-visible name of the
2608 device, as in objects.Disk.iv_name
2613 if dev_path is None:
2614 logging.error("DevCacheManager.UpdateCache got a None dev_path")
2616 fpath = cls._ConvertPath(dev_path)
2622 iv_name = "not_visible"
2623 fdata = "%s %s %s\n" % (str(owner), state, iv_name)
2625 utils.WriteFile(fpath, data=fdata)
2626 except EnvironmentError, err:
2627 logging.exception("Can't update bdev cache for %s", dev_path)
2630 def RemoveCache(cls, dev_path):
2631 """Remove data for a dev_path.
2633 This is just a wrapper over L{utils.RemoveFile} with a converted
2634 path name and logging.
2637 @param dev_path: the pathname of the device
2642 if dev_path is None:
2643 logging.error("DevCacheManager.RemoveCache got a None dev_path")
2645 fpath = cls._ConvertPath(dev_path)
2647 utils.RemoveFile(fpath)
2648 except EnvironmentError, err:
2649 logging.exception("Can't update bdev cache for %s", dev_path)