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
44 from ganeti import errors
45 from ganeti import utils
48 # Read the BaseHypervisor.PARAMETERS docstring for the syntax of the
52 _FILE_CHECK = (utils.IsNormAbsPath, "must be an absolute normal path",
53 os.path.isfile, "not found or not a file")
56 _DIR_CHECK = (utils.IsNormAbsPath, "must be an absolute normal path",
57 os.path.isdir, "not found or not a directory")
59 # nice wrappers for users
60 REQ_FILE_CHECK = (True, ) + _FILE_CHECK
61 OPT_FILE_CHECK = (False, ) + _FILE_CHECK
62 REQ_DIR_CHECK = (True, ) + _DIR_CHECK
63 OPT_DIR_CHECK = (False, ) + _DIR_CHECK
66 NO_CHECK = (False, None, None, None, None)
68 # required, but no other checks
69 REQUIRED_CHECK = (True, None, None, None, None)
71 def ParamInSet(required, my_set):
72 """Builds parameter checker for set membership.
74 @type required: boolean
75 @param required: whether this is a required parameter
76 @type my_set: tuple, list or set
77 @param my_set: allowed values set
80 fn = lambda x: x in my_set
81 err = ("The value must be one of: %s" % utils.CommaJoin(my_set))
82 return (required, fn, err, None, None)
85 class BaseHypervisor(object):
86 """Abstract virtualisation technology interface
88 The goal is that all aspects of the virtualisation technology are
89 abstracted away from the rest of code.
91 @cvar PARAMETERS: a dict of parameter name: check type; the check type is
92 a five-tuple containing:
93 - the required flag (boolean)
94 - a function to check for syntax, that will be used in
95 L{CheckParameterSyntax}, in the master daemon process
96 - an error message for the above function
97 - a function to check for parameter validity on the remote node,
98 in the L{ValidateParameters} function
99 - an error message for the above function
108 def StartInstance(self, instance, block_devices):
109 """Start an instance."""
110 raise NotImplementedError
112 def StopInstance(self, instance, force=False):
113 """Stop an instance."""
114 raise NotImplementedError
116 def RebootInstance(self, instance):
117 """Reboot an instance."""
118 raise NotImplementedError
120 def ListInstances(self):
121 """Get the list of running instances."""
122 raise NotImplementedError
124 def GetInstanceInfo(self, instance_name):
125 """Get instance properties.
127 @type instance_name: string
128 @param instance_name: the instance name
130 @return: tuple (name, id, memory, vcpus, state, times)
133 raise NotImplementedError
135 def GetAllInstancesInfo(self):
136 """Get properties of all instances.
138 @return: list of tuples (name, id, memory, vcpus, stat, times)
141 raise NotImplementedError
143 def GetNodeInfo(self):
144 """Return information about the node.
146 @return: a dict with the following keys (values in MiB):
147 - memory_total: the total memory size on the node
148 - memory_free: the available memory on the node for instances
149 - memory_dom0: the memory used by the node itself, if available
152 raise NotImplementedError
155 def GetShellCommandForConsole(cls, instance, hvparams, beparams):
156 """Return a command for connecting to the console of an instance.
159 raise NotImplementedError
162 def GetAncillaryFiles(cls):
163 """Return a list of ancillary files to be copied to all nodes as ancillary
166 @rtype: list of strings
167 @return: list of absolute paths of files to ship cluster-wide
170 # By default we return a member variable, so that if an hypervisor has just
171 # a static list of files it doesn't have to override this function.
172 return cls.ANCILLARY_FILES
175 """Verify the hypervisor.
178 raise NotImplementedError
180 def MigrationInfo(self, instance):
181 """Get instance information to perform a migration.
183 By default assume no information is needed.
185 @type instance: L{objects.Instance}
186 @param instance: instance to be migrated
187 @rtype: string/data (opaque)
188 @return: instance migration information - serialized form
193 def AcceptInstance(self, instance, info, target):
194 """Prepare to accept an instance.
196 By default assume no preparation is needed.
198 @type instance: L{objects.Instance}
199 @param instance: instance to be accepted
200 @type info: string/data (opaque)
201 @param info: migration information, from the source node
203 @param target: target host (usually ip), on this node
208 def FinalizeMigration(self, instance, info, success):
209 """Finalized an instance migration.
211 Should finalize or revert any preparation done to accept the instance.
212 Since by default we do no preparation, we also don't have anything to do
214 @type instance: L{objects.Instance}
215 @param instance: instance whose migration is being aborted
216 @type info: string/data (opaque)
217 @param info: migration information, from the source node
218 @type success: boolean
219 @param success: whether the migration was a success or a failure
224 def MigrateInstance(self, name, target, live):
225 """Migrate an instance.
228 @param name: name of the instance to be migrated
230 @param target: hostname (usually ip) of the target node
232 @param live: whether to do a live or non-live migration
235 raise NotImplementedError
238 def CheckParameterSyntax(cls, hvparams):
239 """Check the given parameters for validity.
241 This should check the passed set of parameters for
242 validity. Classes should extend, not replace, this function.
245 @param hvparams: dictionary with parameter names/value
246 @raise errors.HypervisorError: when a parameter is not valid
250 if key not in cls.PARAMETERS:
251 raise errors.HypervisorError("Parameter '%s' is not supported" % key)
253 # cheap tests that run on the master, should not access the world
254 for name, (required, check_fn, errstr, _, _) in cls.PARAMETERS.items():
255 if name not in hvparams:
256 raise errors.HypervisorError("Parameter '%s' is missing" % name)
257 value = hvparams[name]
258 if not required and not value:
261 raise errors.HypervisorError("Parameter '%s' is required but"
262 " is currently not defined" % (name, ))
263 if check_fn is not None and not check_fn(value):
264 raise errors.HypervisorError("Parameter '%s' fails syntax"
265 " check: %s (current value: '%s')" %
266 (name, errstr, value))
269 def ValidateParameters(cls, hvparams):
270 """Check the given parameters for validity.
272 This should check the passed set of parameters for
273 validity. Classes should extend, not replace, this function.
276 @param hvparams: dictionary with parameter names/value
277 @raise errors.HypervisorError: when a parameter is not valid
280 for name, (required, _, _, check_fn, errstr) in cls.PARAMETERS.items():
281 value = hvparams[name]
282 if not required and not value:
284 if check_fn is not None and not check_fn(value):
285 raise errors.HypervisorError("Parameter '%s' fails"
286 " validation: %s (current value: '%s')" %
287 (name, errstr, value))
289 def GetLinuxNodeInfo(self):
290 """For linux systems, return actual OS information.
292 This is an abstraction for all non-hypervisor-based classes, where
293 the node actually sees all the memory and CPUs via the /proc
294 interface and standard commands. The other case if for example
295 xen, where you only see the hardware resources via xen-specific
298 @return: a dict with the following keys (values in MiB):
299 - memory_total: the total memory size on the node
300 - memory_free: the available memory on the node for instances
301 - memory_dom0: the memory used by the node itself, if available
305 fh = file("/proc/meminfo")
307 data = fh.readlines()
310 except EnvironmentError, err:
311 raise errors.HypervisorError("Failed to list node info: %s" % (err,))
317 splitfields = line.split(":", 1)
319 if len(splitfields) > 1:
320 key = splitfields[0].strip()
321 val = splitfields[1].strip()
322 if key == 'MemTotal':
323 result['memory_total'] = int(val.split()[0])/1024
324 elif key in ('MemFree', 'Buffers', 'Cached'):
325 sum_free += int(val.split()[0])/1024
326 elif key == 'Active':
327 result['memory_dom0'] = int(val.split()[0])/1024
328 except (ValueError, TypeError), err:
329 raise errors.HypervisorError("Failed to compute memory usage: %s" %
331 result['memory_free'] = sum_free
335 fh = open("/proc/cpuinfo")
337 cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",
341 except EnvironmentError, err:
342 raise errors.HypervisorError("Failed to list node info: %s" % (err,))
343 result['cpu_total'] = cpu_total
344 # FIXME: export correct data here
345 result['cpu_nodes'] = 1
346 result['cpu_sockets'] = 1