root / lib / hypervisor / hv_base.py @ 17c61836
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# Copyright (C) 2006, 2007, 2008 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Base class for all hypervisors
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The syntax for the _CHECK variables and the contents of the PARAMETERS
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dict is the same, see the docstring for L{BaseHypervisor.PARAMETERS}.
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@var _FILE_CHECK: stub for file checks, without the required flag
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@var _DIR_CHECK: stub for directory checks, without the required flag
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@var REQ_FILE_CHECK: mandatory file parameter
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@var OPT_FILE_CHECK: optional file parameter
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@var REQ_DIR_CHECK: mandatory directory parametr
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@var OPT_DIR_CHECK: optional directory parameter
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@var NO_CHECK: parameter without any checks at all
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@var REQUIRED_CHECK: parameter required to exist (and non-false), but
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without other checks; beware that this can't be used for boolean
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parameters, where you should use NO_CHECK or a custom checker
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"""
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import os |
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import re |
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from ganeti import errors |
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from ganeti import utils |
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# Read the BaseHypervisor.PARAMETERS docstring for the syntax of the
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# _CHECK values
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# must be afile
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_FILE_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
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os.path.isfile, "not found or not a file")
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# must be a directory
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_DIR_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
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os.path.isdir, "not found or not a directory")
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# nice wrappers for users
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REQ_FILE_CHECK = (True, ) + _FILE_CHECK
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OPT_FILE_CHECK = (False, ) + _FILE_CHECK
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REQ_DIR_CHECK = (True, ) + _DIR_CHECK
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OPT_DIR_CHECK = (False, ) + _DIR_CHECK
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# no checks at all
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NO_CHECK = (False, None, None, None, None) |
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# required, but no other checks
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REQUIRED_CHECK = (True, None, None, None, None) |
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def ParamInSet(required, my_set): |
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"""Builds parameter checker for set membership.
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@type required: boolean
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@param required: whether this is a required parameter
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@type my_set: tuple, list or set
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@param my_set: allowed values set
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"""
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fn = lambda x: x in my_set |
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err = ("The value must be one of: %s" % utils.CommaJoin(my_set))
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return (required, fn, err, None, None) |
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class BaseHypervisor(object): |
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"""Abstract virtualisation technology interface
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The goal is that all aspects of the virtualisation technology are
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abstracted away from the rest of code.
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@cvar PARAMETERS: a dict of parameter name: check type; the check type is
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a five-tuple containing:
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- the required flag (boolean)
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- a function to check for syntax, that will be used in
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L{CheckParameterSyntax}, in the master daemon process
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- an error message for the above function
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- a function to check for parameter validity on the remote node,
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in the L{ValidateParameters} function
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- an error message for the above function
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"""
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PARAMETERS = {} |
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ANCILLARY_FILES = [] |
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def __init__(self): |
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pass
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def StartInstance(self, instance, block_devices): |
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"""Start an instance."""
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raise NotImplementedError |
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def StopInstance(self, instance, force=False): |
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"""Stop an instance."""
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raise NotImplementedError |
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def RebootInstance(self, instance): |
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"""Reboot an instance."""
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raise NotImplementedError |
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def ListInstances(self): |
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"""Get the list of running instances."""
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raise NotImplementedError |
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def GetInstanceInfo(self, instance_name): |
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"""Get instance properties.
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@type instance_name: string
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@param instance_name: the instance name
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@return: tuple (name, id, memory, vcpus, state, times)
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"""
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raise NotImplementedError |
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def GetAllInstancesInfo(self): |
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"""Get properties of all instances.
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@return: list of tuples (name, id, memory, vcpus, stat, times)
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"""
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raise NotImplementedError |
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def GetNodeInfo(self): |
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"""Return information about the node.
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@return: a dict with the following keys (values in MiB):
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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raise NotImplementedError |
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@classmethod
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def GetShellCommandForConsole(cls, instance, hvparams, beparams): |
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"""Return a command for connecting to the console of an instance.
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"""
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raise NotImplementedError |
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@classmethod
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def GetAncillaryFiles(cls): |
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"""Return a list of ancillary files to be copied to all nodes as ancillary
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configuration files.
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@rtype: list of strings
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@return: list of absolute paths of files to ship cluster-wide
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"""
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# By default we return a member variable, so that if an hypervisor has just
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# a static list of files it doesn't have to override this function.
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return cls.ANCILLARY_FILES
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def Verify(self): |
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"""Verify the hypervisor.
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"""
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raise NotImplementedError |
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def MigrationInfo(self, instance): |
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"""Get instance information to perform a migration.
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By default assume no information is needed.
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@type instance: L{objects.Instance}
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@param instance: instance to be migrated
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@rtype: string/data (opaque)
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@return: instance migration information - serialized form
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"""
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return '' |
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def AcceptInstance(self, instance, info, target): |
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"""Prepare to accept an instance.
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By default assume no preparation is needed.
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@type instance: L{objects.Instance}
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@param instance: instance to be accepted
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@type info: string/data (opaque)
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@param info: migration information, from the source node
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@type target: string
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@param target: target host (usually ip), on this node
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"""
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pass
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def FinalizeMigration(self, instance, info, success): |
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"""Finalized an instance migration.
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Should finalize or revert any preparation done to accept the instance.
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Since by default we do no preparation, we also don't have anything to do
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@type instance: L{objects.Instance}
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@param instance: instance whose migration is being aborted
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@type info: string/data (opaque)
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@param info: migration information, from the source node
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@type success: boolean
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@param success: whether the migration was a success or a failure
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"""
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pass
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def MigrateInstance(self, name, target, live): |
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"""Migrate an instance.
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@type name: string
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@param name: name of the instance to be migrated
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@type target: string
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@param target: hostname (usually ip) of the target node
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@type live: boolean
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@param live: whether to do a live or non-live migration
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"""
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raise NotImplementedError |
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@classmethod
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def CheckParameterSyntax(cls, hvparams): |
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"""Check the given parameters for validity.
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This should check the passed set of parameters for
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validity. Classes should extend, not replace, this function.
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@type hvparams: dict
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@param hvparams: dictionary with parameter names/value
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@raise errors.HypervisorError: when a parameter is not valid
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"""
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for key in hvparams: |
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if key not in cls.PARAMETERS: |
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raise errors.HypervisorError("Parameter '%s' is not supported" % key) |
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# cheap tests that run on the master, should not access the world
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for name, (required, check_fn, errstr, _, _) in cls.PARAMETERS.items(): |
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if name not in hvparams: |
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raise errors.HypervisorError("Parameter '%s' is missing" % name) |
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value = hvparams[name] |
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if not required and not value: |
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continue
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if not value: |
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raise errors.HypervisorError("Parameter '%s' is required but" |
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" is currently not defined" % (name, ))
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if check_fn is not None and not check_fn(value): |
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raise errors.HypervisorError("Parameter '%s' fails syntax" |
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" check: %s (current value: '%s')" %
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(name, errstr, value)) |
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@classmethod
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def ValidateParameters(cls, hvparams): |
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"""Check the given parameters for validity.
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This should check the passed set of parameters for
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validity. Classes should extend, not replace, this function.
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@type hvparams: dict
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@param hvparams: dictionary with parameter names/value
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@raise errors.HypervisorError: when a parameter is not valid
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"""
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for name, (required, _, _, check_fn, errstr) in cls.PARAMETERS.items(): |
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value = hvparams[name] |
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if not required and not value: |
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continue
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if check_fn is not None and not check_fn(value): |
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raise errors.HypervisorError("Parameter '%s' fails" |
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" validation: %s (current value: '%s')" %
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(name, errstr, value)) |
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def GetLinuxNodeInfo(self): |
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"""For linux systems, return actual OS information.
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This is an abstraction for all non-hypervisor-based classes, where
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the node actually sees all the memory and CPUs via the /proc
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interface and standard commands. The other case if for example
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xen, where you only see the hardware resources via xen-specific
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tools.
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@return: a dict with the following keys (values in MiB):
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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try:
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fh = file("/proc/meminfo") |
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try:
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data = fh.readlines() |
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finally:
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fh.close() |
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except EnvironmentError, err: |
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raise errors.HypervisorError("Failed to list node info: %s" % (err,)) |
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result = {} |
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sum_free = 0
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try:
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for line in data: |
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splitfields = line.split(":", 1) |
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if len(splitfields) > 1: |
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key = splitfields[0].strip()
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val = splitfields[1].strip()
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if key == 'MemTotal': |
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result['memory_total'] = int(val.split()[0])/1024 |
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elif key in ('MemFree', 'Buffers', 'Cached'): |
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sum_free += int(val.split()[0])/1024 |
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elif key == 'Active': |
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result['memory_dom0'] = int(val.split()[0])/1024 |
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except (ValueError, TypeError), err: |
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raise errors.HypervisorError("Failed to compute memory usage: %s" % |
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(err,)) |
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result['memory_free'] = sum_free
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cpu_total = 0
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try:
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fh = open("/proc/cpuinfo") |
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try:
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cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$", |
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fh.read())) |
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finally:
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fh.close() |
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except EnvironmentError, err: |
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raise errors.HypervisorError("Failed to list node info: %s" % (err,)) |
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result['cpu_total'] = cpu_total
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# FIXME: export correct data here
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result['cpu_nodes'] = 1 |
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result['cpu_sockets'] = 1 |
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return result
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