4 # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2012, 2013 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 """Base class for all hypervisors
24 The syntax for the _CHECK variables and the contents of the PARAMETERS
25 dict is the same, see the docstring for L{BaseHypervisor.PARAMETERS}.
27 @var _FILE_CHECK: stub for file checks, without the required flag
28 @var _DIR_CHECK: stub for directory checks, without the required flag
29 @var REQ_FILE_CHECK: mandatory file parameter
30 @var OPT_FILE_CHECK: optional file parameter
31 @var REQ_DIR_CHECK: mandatory directory parametr
32 @var OPT_DIR_CHECK: optional directory parameter
33 @var NO_CHECK: parameter without any checks at all
34 @var REQUIRED_CHECK: parameter required to exist (and non-false), but
35 without other checks; beware that this can't be used for boolean
36 parameters, where you should use NO_CHECK or a custom checker
45 from ganeti import errors
46 from ganeti import utils
47 from ganeti import constants
50 def _IsCpuMaskWellFormed(cpu_mask):
51 """Verifies if the given single CPU mask is valid
53 The single CPU mask should be in the form "a,b,c,d", where each
54 letter is a positive number or range.
58 cpu_list = utils.ParseCpuMask(cpu_mask)
59 except errors.ParseError, _:
61 return isinstance(cpu_list, list) and len(cpu_list) > 0
64 def _IsMultiCpuMaskWellFormed(cpu_mask):
65 """Verifies if the given multiple CPU mask is valid
67 A valid multiple CPU mask is in the form "a:b:c:d", where each
68 letter is a single CPU mask.
72 utils.ParseMultiCpuMask(cpu_mask)
73 except errors.ParseError, _:
79 # Read the BaseHypervisor.PARAMETERS docstring for the syntax of the
83 _FILE_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
84 os.path.isfile, "not found or not a file")
87 _DIR_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
88 os.path.isdir, "not found or not a directory")
90 # CPU mask must be well-formed
91 # TODO: implement node level check for the CPU mask
92 _CPU_MASK_CHECK = (_IsCpuMaskWellFormed,
93 "CPU mask definition is not well-formed",
96 # Multiple CPU mask must be well-formed
97 _MULTI_CPU_MASK_CHECK = (_IsMultiCpuMaskWellFormed,
98 "Multiple CPU mask definition is not well-formed",
101 # Check for validity of port number
102 _NET_PORT_CHECK = (lambda x: 0 < x < 65535, "invalid port number",
105 # Check that an integer is non negative
106 _NONNEGATIVE_INT_CHECK = (lambda x: x >= 0, "cannot be negative", None, None)
108 # nice wrappers for users
109 REQ_FILE_CHECK = (True, ) + _FILE_CHECK
110 OPT_FILE_CHECK = (False, ) + _FILE_CHECK
111 REQ_DIR_CHECK = (True, ) + _DIR_CHECK
112 OPT_DIR_CHECK = (False, ) + _DIR_CHECK
113 REQ_NET_PORT_CHECK = (True, ) + _NET_PORT_CHECK
114 OPT_NET_PORT_CHECK = (False, ) + _NET_PORT_CHECK
115 REQ_CPU_MASK_CHECK = (True, ) + _CPU_MASK_CHECK
116 OPT_CPU_MASK_CHECK = (False, ) + _CPU_MASK_CHECK
117 REQ_MULTI_CPU_MASK_CHECK = (True, ) + _MULTI_CPU_MASK_CHECK
118 OPT_MULTI_CPU_MASK_CHECK = (False, ) + _MULTI_CPU_MASK_CHECK
119 REQ_NONNEGATIVE_INT_CHECK = (True, ) + _NONNEGATIVE_INT_CHECK
120 OPT_NONNEGATIVE_INT_CHECK = (False, ) + _NONNEGATIVE_INT_CHECK
123 NO_CHECK = (False, None, None, None, None)
125 # required, but no other checks
126 REQUIRED_CHECK = (True, None, None, None, None)
129 MIGRATION_MODE_CHECK = (True, lambda x: x in constants.HT_MIGRATION_MODES,
130 "invalid migration mode", None, None)
133 def ParamInSet(required, my_set):
134 """Builds parameter checker for set membership.
136 @type required: boolean
137 @param required: whether this is a required parameter
138 @type my_set: tuple, list or set
139 @param my_set: allowed values set
142 fn = lambda x: x in my_set
143 err = ("The value must be one of: %s" % utils.CommaJoin(my_set))
144 return (required, fn, err, None, None)
147 class BaseHypervisor(object):
148 """Abstract virtualisation technology interface
150 The goal is that all aspects of the virtualisation technology are
151 abstracted away from the rest of code.
153 @cvar PARAMETERS: a dict of parameter name: check type; the check type is
154 a five-tuple containing:
155 - the required flag (boolean)
156 - a function to check for syntax, that will be used in
157 L{CheckParameterSyntax}, in the master daemon process
158 - an error message for the above function
159 - a function to check for parameter validity on the remote node,
160 in the L{ValidateParameters} function
161 - an error message for the above function
162 @type CAN_MIGRATE: boolean
163 @cvar CAN_MIGRATE: whether this hypervisor can do migration (either
169 ANCILLARY_FILES_OPT = []
172 def StartInstance(self, instance, block_devices, startup_paused):
173 """Start an instance."""
174 raise NotImplementedError
176 def StopInstance(self, instance, force=False, retry=False, name=None):
179 @type instance: L{objects.Instance}
180 @param instance: instance to stop
182 @param force: whether to do a "hard" stop (destroy)
184 @param retry: whether this is just a retry call
185 @type name: string or None
186 @param name: if this parameter is passed, the the instance object
187 should not be used (will be passed as None), and the shutdown
188 must be done by name only
191 raise NotImplementedError
193 def CleanupInstance(self, instance_name):
194 """Cleanup after a stopped instance
196 This is an optional method, used by hypervisors that need to cleanup after
197 an instance has been stopped.
199 @type instance_name: string
200 @param instance_name: instance name to cleanup after
205 def RebootInstance(self, instance):
206 """Reboot an instance."""
207 raise NotImplementedError
209 def ListInstances(self, hvparams=None):
210 """Get the list of running instances."""
211 raise NotImplementedError
213 def GetInstanceInfo(self, instance_name):
214 """Get instance properties.
216 @type instance_name: string
217 @param instance_name: the instance name
219 @return: tuple (name, id, memory, vcpus, state, times)
222 raise NotImplementedError
224 def GetAllInstancesInfo(self):
225 """Get properties of all instances.
227 @return: list of tuples (name, id, memory, vcpus, stat, times)
230 raise NotImplementedError
232 def GetNodeInfo(self):
233 """Return information about the node.
235 @return: a dict with the following keys (values in MiB):
236 - memory_total: the total memory size on the node
237 - memory_free: the available memory on the node for instances
238 - memory_dom0: the memory used by the node itself, if available
241 raise NotImplementedError
244 def GetInstanceConsole(cls, instance, hvparams, beparams):
245 """Return information for connecting to the console of an instance.
248 raise NotImplementedError
251 def GetAncillaryFiles(cls):
252 """Return a list of ancillary files to be copied to all nodes as ancillary
255 @rtype: (list of absolute paths, list of absolute paths)
256 @return: (all files, optional files)
259 # By default we return a member variable, so that if an hypervisor has just
260 # a static list of files it doesn't have to override this function.
261 assert set(cls.ANCILLARY_FILES).issuperset(cls.ANCILLARY_FILES_OPT), \
262 "Optional ancillary files must be a subset of ancillary files"
264 return (cls.ANCILLARY_FILES, cls.ANCILLARY_FILES_OPT)
266 def Verify(self, hvparams=None):
267 """Verify the hypervisor.
269 @type hvparams: dict of strings
270 @param hvparams: hypervisor parameters to be verified against
272 @return: Problem description if something is wrong, C{None} otherwise
275 raise NotImplementedError
277 def MigrationInfo(self, instance): # pylint: disable=R0201,W0613
278 """Get instance information to perform a migration.
280 By default assume no information is needed.
282 @type instance: L{objects.Instance}
283 @param instance: instance to be migrated
284 @rtype: string/data (opaque)
285 @return: instance migration information - serialized form
290 def AcceptInstance(self, instance, info, target):
291 """Prepare to accept an instance.
293 By default assume no preparation is needed.
295 @type instance: L{objects.Instance}
296 @param instance: instance to be accepted
297 @type info: string/data (opaque)
298 @param info: migration information, from the source node
300 @param target: target host (usually ip), on this node
305 def BalloonInstanceMemory(self, instance, mem):
306 """Balloon an instance memory to a certain value.
308 @type instance: L{objects.Instance}
309 @param instance: instance to be accepted
311 @param mem: actual memory size to use for instance runtime
314 raise NotImplementedError
316 def FinalizeMigrationDst(self, instance, info, success):
317 """Finalize the instance migration on the target node.
319 Should finalize or revert any preparation done to accept the instance.
320 Since by default we do no preparation, we also don't have anything to do
322 @type instance: L{objects.Instance}
323 @param instance: instance whose migration is being finalized
324 @type info: string/data (opaque)
325 @param info: migration information, from the source node
326 @type success: boolean
327 @param success: whether the migration was a success or a failure
332 def MigrateInstance(self, instance, target, live):
333 """Migrate an instance.
335 @type instance: L{objects.Instance}
336 @param instance: the instance to be migrated
338 @param target: hostname (usually ip) of the target node
340 @param live: whether to do a live or non-live migration
343 raise NotImplementedError
345 def FinalizeMigrationSource(self, instance, success, live):
346 """Finalize the instance migration on the source node.
348 @type instance: L{objects.Instance}
349 @param instance: the instance that was migrated
351 @param success: whether the migration succeeded or not
353 @param live: whether the user requested a live migration or not
358 def GetMigrationStatus(self, instance):
359 """Get the migration status
361 @type instance: L{objects.Instance}
362 @param instance: the instance that is being migrated
363 @rtype: L{objects.MigrationStatus}
364 @return: the status of the current migration (one of
365 L{constants.HV_MIGRATION_VALID_STATUSES}), plus any additional
366 progress info that can be retrieved from the hypervisor
369 raise NotImplementedError
371 def _InstanceStartupMemory(self, instance):
372 """Get the correct startup memory for an instance
374 This function calculates how much memory an instance should be started
375 with, making sure it's a value between the minimum and the maximum memory,
376 but also trying to use no more than the current free memory on the node.
378 @type instance: L{objects.Instance}
379 @param instance: the instance that is being started
381 @return: memory the instance should be started with
384 free_memory = self.GetNodeInfo()["memory_free"]
385 max_start_mem = min(instance.beparams[constants.BE_MAXMEM], free_memory)
386 start_mem = max(instance.beparams[constants.BE_MINMEM], max_start_mem)
390 def CheckParameterSyntax(cls, hvparams):
391 """Check the given parameters for validity.
393 This should check the passed set of parameters for
394 validity. Classes should extend, not replace, this function.
397 @param hvparams: dictionary with parameter names/value
398 @raise errors.HypervisorError: when a parameter is not valid
402 if key not in cls.PARAMETERS:
403 raise errors.HypervisorError("Parameter '%s' is not supported" % key)
405 # cheap tests that run on the master, should not access the world
406 for name, (required, check_fn, errstr, _, _) in cls.PARAMETERS.items():
407 if name not in hvparams:
408 raise errors.HypervisorError("Parameter '%s' is missing" % name)
409 value = hvparams[name]
410 if not required and not value:
413 raise errors.HypervisorError("Parameter '%s' is required but"
414 " is currently not defined" % (name, ))
415 if check_fn is not None and not check_fn(value):
416 raise errors.HypervisorError("Parameter '%s' fails syntax"
417 " check: %s (current value: '%s')" %
418 (name, errstr, value))
421 def ValidateParameters(cls, hvparams):
422 """Check the given parameters for validity.
424 This should check the passed set of parameters for
425 validity. Classes should extend, not replace, this function.
428 @param hvparams: dictionary with parameter names/value
429 @raise errors.HypervisorError: when a parameter is not valid
432 for name, (required, _, _, check_fn, errstr) in cls.PARAMETERS.items():
433 value = hvparams[name]
434 if not required and not value:
436 if check_fn is not None and not check_fn(value):
437 raise errors.HypervisorError("Parameter '%s' fails"
438 " validation: %s (current value: '%s')" %
439 (name, errstr, value))
442 def PowercycleNode(cls):
443 """Hard powercycle a node using hypervisor specific methods.
445 This method should hard powercycle the node, using whatever
446 methods the hypervisor provides. Note that this means that all
447 instances running on the node must be stopped too.
450 raise NotImplementedError
453 def GetLinuxNodeInfo():
454 """For linux systems, return actual OS information.
456 This is an abstraction for all non-hypervisor-based classes, where
457 the node actually sees all the memory and CPUs via the /proc
458 interface and standard commands. The other case if for example
459 xen, where you only see the hardware resources via xen-specific
462 @return: a dict with the following keys (values in MiB):
463 - memory_total: the total memory size on the node
464 - memory_free: the available memory on the node for instances
465 - memory_dom0: the memory used by the node itself, if available
469 data = utils.ReadFile("/proc/meminfo").splitlines()
470 except EnvironmentError, err:
471 raise errors.HypervisorError("Failed to list node info: %s" % (err,))
477 splitfields = line.split(":", 1)
479 if len(splitfields) > 1:
480 key = splitfields[0].strip()
481 val = splitfields[1].strip()
482 if key == "MemTotal":
483 result["memory_total"] = int(val.split()[0]) / 1024
484 elif key in ("MemFree", "Buffers", "Cached"):
485 sum_free += int(val.split()[0]) / 1024
486 elif key == "Active":
487 result["memory_dom0"] = int(val.split()[0]) / 1024
488 except (ValueError, TypeError), err:
489 raise errors.HypervisorError("Failed to compute memory usage: %s" %
491 result["memory_free"] = sum_free
495 fh = open("/proc/cpuinfo")
497 cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",
501 except EnvironmentError, err:
502 raise errors.HypervisorError("Failed to list node info: %s" % (err,))
503 result["cpu_total"] = cpu_total
504 # FIXME: export correct data here
505 result["cpu_nodes"] = 1
506 result["cpu_sockets"] = 1
511 def LinuxPowercycle(cls):
512 """Linux-specific powercycle method.
516 fd = os.open("/proc/sysrq-trigger", os.O_WRONLY)
522 logging.exception("Can't open the sysrq-trigger file")
523 result = utils.RunCmd(["reboot", "-n", "-f"])
525 logging.error("Can't run shutdown: %s", result.output)
528 def _FormatVerifyResults(msgs):
529 """Formats the verification results, given a list of errors.
531 @param msgs: list of errors, possibly empty
532 @return: overall problem description if something is wrong,
537 return "; ".join(msgs)