4 # Copyright (C) 2006, 2007, 2008 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
49 # Read the BaseHypervisor.PARAMETERS docstring for the syntax of the
53 _FILE_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
54 os.path.isfile, "not found or not a file")
57 _DIR_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
58 os.path.isdir, "not found or not a directory")
60 # nice wrappers for users
61 REQ_FILE_CHECK = (True, ) + _FILE_CHECK
62 OPT_FILE_CHECK = (False, ) + _FILE_CHECK
63 REQ_DIR_CHECK = (True, ) + _DIR_CHECK
64 OPT_DIR_CHECK = (False, ) + _DIR_CHECK
67 NO_CHECK = (False, None, None, None, None)
69 # required, but no other checks
70 REQUIRED_CHECK = (True, None, None, None, None)
73 def ParamInSet(required, my_set):
74 """Builds parameter checker for set membership.
76 @type required: boolean
77 @param required: whether this is a required parameter
78 @type my_set: tuple, list or set
79 @param my_set: allowed values set
82 fn = lambda x: x in my_set
83 err = ("The value must be one of: %s" % " ,".join(my_set))
84 return (required, fn, err, None, None)
87 class BaseHypervisor(object):
88 """Abstract virtualisation technology interface
90 The goal is that all aspects of the virtualisation technology are
91 abstracted away from the rest of code.
93 @cvar PARAMETERS: a dict of parameter name: check type; the check type is
94 a five-tuple containing:
95 - the required flag (boolean)
96 - a function to check for syntax, that will be used in
97 L{CheckParameterSyntax}, in the master daemon process
98 - an error message for the above function
99 - a function to check for parameter validity on the remote node,
100 in the L{ValidateParameters} function
101 - an error message for the above function
110 def StartInstance(self, instance, block_devices):
111 """Start an instance."""
112 raise NotImplementedError
114 def StopInstance(self, instance, force=False, retry=False):
117 @type instance: L{objects.Instance}
118 @param instance: instance to stop
120 @param force: whether to do a "hard" stop (destroy)
122 @param retry: whether this is just a retry call
125 raise NotImplementedError
127 def RebootInstance(self, instance):
128 """Reboot an instance."""
129 raise NotImplementedError
131 def ListInstances(self):
132 """Get the list of running instances."""
133 raise NotImplementedError
135 def GetInstanceInfo(self, instance_name):
136 """Get instance properties.
138 @type instance_name: string
139 @param instance_name: the instance name
141 @return: tuple (name, id, memory, vcpus, state, times)
144 raise NotImplementedError
146 def GetAllInstancesInfo(self):
147 """Get properties of all instances.
149 @return: list of tuples (name, id, memory, vcpus, stat, times)
152 raise NotImplementedError
154 def GetNodeInfo(self):
155 """Return information about the node.
157 @return: a dict with the following keys (values in MiB):
158 - memory_total: the total memory size on the node
159 - memory_free: the available memory on the node for instances
160 - memory_dom0: the memory used by the node itself, if available
163 raise NotImplementedError
166 def GetShellCommandForConsole(cls, instance, hvparams, beparams):
167 """Return a command for connecting to the console of an instance.
170 raise NotImplementedError
173 def GetAncillaryFiles(cls):
174 """Return a list of ancillary files to be copied to all nodes as ancillary
177 @rtype: list of strings
178 @return: list of absolute paths of files to ship cluster-wide
181 # By default we return a member variable, so that if an hypervisor has just
182 # a static list of files it doesn't have to override this function.
183 return cls.ANCILLARY_FILES
186 """Verify the hypervisor.
189 raise NotImplementedError
191 def MigrationInfo(self, instance):
192 """Get instance information to perform a migration.
194 By default assume no information is needed.
196 @type instance: L{objects.Instance}
197 @param instance: instance to be migrated
198 @rtype: string/data (opaque)
199 @return: instance migration information - serialized form
204 def AcceptInstance(self, instance, info, target):
205 """Prepare to accept an instance.
207 By default assume no preparation is needed.
209 @type instance: L{objects.Instance}
210 @param instance: instance to be accepted
211 @type info: string/data (opaque)
212 @param info: migration information, from the source node
214 @param target: target host (usually ip), on this node
219 def FinalizeMigration(self, instance, info, success):
220 """Finalized an instance migration.
222 Should finalize or revert any preparation done to accept the instance.
223 Since by default we do no preparation, we also don't have anything to do
225 @type instance: L{objects.Instance}
226 @param instance: instance whose migration is being aborted
227 @type info: string/data (opaque)
228 @param info: migration information, from the source node
229 @type success: boolean
230 @param success: whether the migration was a success or a failure
235 def MigrateInstance(self, instance, target, live):
236 """Migrate an instance.
238 @type instance: L{object.Instance}
239 @param name: the instance to be migrated
241 @param target: hostname (usually ip) of the target node
243 @param live: whether to do a live or non-live migration
246 raise NotImplementedError
249 def CheckParameterSyntax(cls, hvparams):
250 """Check the given parameters for validity.
252 This should check the passed set of parameters for
253 validity. Classes should extend, not replace, this function.
256 @param hvparams: dictionary with parameter names/value
257 @raise errors.HypervisorError: when a parameter is not valid
261 if key not in cls.PARAMETERS:
262 raise errors.HypervisorError("Parameter '%s' is not supported" % key)
264 # cheap tests that run on the master, should not access the world
265 for name, (required, check_fn, errstr, _, _) in cls.PARAMETERS.items():
266 if name not in hvparams:
267 raise errors.HypervisorError("Parameter '%s' is missing" % name)
268 value = hvparams[name]
269 if not required and not value:
272 raise errors.HypervisorError("Parameter '%s' is required but"
273 " is currently not defined" % (name, ))
274 if check_fn is not None and not check_fn(value):
275 raise errors.HypervisorError("Parameter '%s' fails syntax"
276 " check: %s (current value: '%s')" %
277 (name, errstr, value))
280 def ValidateParameters(cls, hvparams):
281 """Check the given parameters for validity.
283 This should check the passed set of parameters for
284 validity. Classes should extend, not replace, this function.
287 @param hvparams: dictionary with parameter names/value
288 @raise errors.HypervisorError: when a parameter is not valid
291 for name, (required, _, _, check_fn, errstr) in cls.PARAMETERS.items():
292 value = hvparams[name]
293 if not required and not value:
295 if check_fn is not None and not check_fn(value):
296 raise errors.HypervisorError("Parameter '%s' fails"
297 " validation: %s (current value: '%s')" %
298 (name, errstr, value))
301 def PowercycleNode(cls):
302 """Hard powercycle a node using hypervisor specific methods.
304 This method should hard powercycle the node, using whatever
305 methods the hypervisor provides. Note that this means that all
306 instances running on the node must be stopped too.
309 raise NotImplementedError
312 def GetLinuxNodeInfo(self):
313 """For linux systems, return actual OS information.
315 This is an abstraction for all non-hypervisor-based classes, where
316 the node actually sees all the memory and CPUs via the /proc
317 interface and standard commands. The other case if for example
318 xen, where you only see the hardware resources via xen-specific
321 @return: a dict with the following keys (values in MiB):
322 - memory_total: the total memory size on the node
323 - memory_free: the available memory on the node for instances
324 - memory_dom0: the memory used by the node itself, if available
328 data = utils.ReadFile("/proc/meminfo").splitlines()
329 except EnvironmentError, err:
330 raise errors.HypervisorError("Failed to list node info: %s" % (err,))
336 splitfields = line.split(":", 1)
338 if len(splitfields) > 1:
339 key = splitfields[0].strip()
340 val = splitfields[1].strip()
341 if key == 'MemTotal':
342 result['memory_total'] = int(val.split()[0])/1024
343 elif key in ('MemFree', 'Buffers', 'Cached'):
344 sum_free += int(val.split()[0])/1024
345 elif key == 'Active':
346 result['memory_dom0'] = int(val.split()[0])/1024
347 except (ValueError, TypeError), err:
348 raise errors.HypervisorError("Failed to compute memory usage: %s" %
350 result['memory_free'] = sum_free
354 fh = open("/proc/cpuinfo")
356 cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",
360 except EnvironmentError, err:
361 raise errors.HypervisorError("Failed to list node info: %s" % (err,))
362 result['cpu_total'] = cpu_total
363 # FIXME: export correct data here
364 result['cpu_nodes'] = 1
365 result['cpu_sockets'] = 1
370 def LinuxPowercycle(cls):
371 """Linux-specific powercycle method.
375 fd = os.open("/proc/sysrq-trigger", os.O_WRONLY)
381 logging.exception("Can't open the sysrq-trigger file")
382 result = utils.RunCmd(["reboot", "-n", "-f"])
384 logging.error("Can't run shutdown: %s", result.output)