#
#
-# Copyright (C) 2006, 2007, 2008 Google Inc.
+# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2012, 2013 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
"""Base class for all hypervisors
+The syntax for the _CHECK variables and the contents of the PARAMETERS
+dict is the same, see the docstring for L{BaseHypervisor.PARAMETERS}.
+
+@var _FILE_CHECK: stub for file checks, without the required flag
+@var _DIR_CHECK: stub for directory checks, without the required flag
+@var REQ_FILE_CHECK: mandatory file parameter
+@var OPT_FILE_CHECK: optional file parameter
+@var REQ_DIR_CHECK: mandatory directory parametr
+@var OPT_DIR_CHECK: optional directory parameter
+@var NO_CHECK: parameter without any checks at all
+@var REQUIRED_CHECK: parameter required to exist (and non-false), but
+ without other checks; beware that this can't be used for boolean
+ parameters, where you should use NO_CHECK or a custom checker
+
"""
+import os
+import re
+import logging
+
+
from ganeti import errors
+from ganeti import utils
+from ganeti import constants
+
+
+def _IsCpuMaskWellFormed(cpu_mask):
+ """Verifies if the given single CPU mask is valid
+
+ The single CPU mask should be in the form "a,b,c,d", where each
+ letter is a positive number or range.
+
+ """
+ try:
+ cpu_list = utils.ParseCpuMask(cpu_mask)
+ except errors.ParseError, _:
+ return False
+ return isinstance(cpu_list, list) and len(cpu_list) > 0
+
+
+def _IsMultiCpuMaskWellFormed(cpu_mask):
+ """Verifies if the given multiple CPU mask is valid
+
+ A valid multiple CPU mask is in the form "a:b:c:d", where each
+ letter is a single CPU mask.
+
+ """
+ try:
+ utils.ParseMultiCpuMask(cpu_mask)
+ except errors.ParseError, _:
+ return False
+
+ return True
+
+
+# Read the BaseHypervisor.PARAMETERS docstring for the syntax of the
+# _CHECK values
+
+# must be afile
+_FILE_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
+ os.path.isfile, "not found or not a file")
+
+# must be a directory
+_DIR_CHECK = (utils.IsNormAbsPath, "must be an absolute normalized path",
+ os.path.isdir, "not found or not a directory")
+
+# CPU mask must be well-formed
+# TODO: implement node level check for the CPU mask
+_CPU_MASK_CHECK = (_IsCpuMaskWellFormed,
+ "CPU mask definition is not well-formed",
+ None, None)
+
+# Multiple CPU mask must be well-formed
+_MULTI_CPU_MASK_CHECK = (_IsMultiCpuMaskWellFormed,
+ "Multiple CPU mask definition is not well-formed",
+ None, None)
+
+# Check for validity of port number
+_NET_PORT_CHECK = (lambda x: 0 < x < 65535, "invalid port number",
+ None, None)
+
+# Check that an integer is non negative
+_NONNEGATIVE_INT_CHECK = (lambda x: x >= 0, "cannot be negative", None, None)
+
+# nice wrappers for users
+REQ_FILE_CHECK = (True, ) + _FILE_CHECK
+OPT_FILE_CHECK = (False, ) + _FILE_CHECK
+REQ_DIR_CHECK = (True, ) + _DIR_CHECK
+OPT_DIR_CHECK = (False, ) + _DIR_CHECK
+REQ_NET_PORT_CHECK = (True, ) + _NET_PORT_CHECK
+OPT_NET_PORT_CHECK = (False, ) + _NET_PORT_CHECK
+REQ_CPU_MASK_CHECK = (True, ) + _CPU_MASK_CHECK
+OPT_CPU_MASK_CHECK = (False, ) + _CPU_MASK_CHECK
+REQ_MULTI_CPU_MASK_CHECK = (True, ) + _MULTI_CPU_MASK_CHECK
+OPT_MULTI_CPU_MASK_CHECK = (False, ) + _MULTI_CPU_MASK_CHECK
+REQ_NONNEGATIVE_INT_CHECK = (True, ) + _NONNEGATIVE_INT_CHECK
+OPT_NONNEGATIVE_INT_CHECK = (False, ) + _NONNEGATIVE_INT_CHECK
+
+# no checks at all
+NO_CHECK = (False, None, None, None, None)
+
+# required, but no other checks
+REQUIRED_CHECK = (True, None, None, None, None)
+
+# migration type
+MIGRATION_MODE_CHECK = (True, lambda x: x in constants.HT_MIGRATION_MODES,
+ "invalid migration mode", None, None)
+
+
+def ParamInSet(required, my_set):
+ """Builds parameter checker for set membership.
+
+ @type required: boolean
+ @param required: whether this is a required parameter
+ @type my_set: tuple, list or set
+ @param my_set: allowed values set
+
+ """
+ fn = lambda x: x in my_set
+ err = ("The value must be one of: %s" % utils.CommaJoin(my_set))
+ return (required, fn, err, None, None)
class BaseHypervisor(object):
The goal is that all aspects of the virtualisation technology are
abstracted away from the rest of code.
- """
- PARAMETERS = []
+ @cvar PARAMETERS: a dict of parameter name: check type; the check type is
+ a five-tuple containing:
+ - the required flag (boolean)
+ - a function to check for syntax, that will be used in
+ L{CheckParameterSyntax}, in the master daemon process
+ - an error message for the above function
+ - a function to check for parameter validity on the remote node,
+ in the L{ValidateParameters} function
+ - an error message for the above function
+ @type CAN_MIGRATE: boolean
+ @cvar CAN_MIGRATE: whether this hypervisor can do migration (either
+ live or non-live)
- def __init__(self):
- pass
+ """
+ PARAMETERS = {}
+ ANCILLARY_FILES = []
+ ANCILLARY_FILES_OPT = []
+ CAN_MIGRATE = False
- def StartInstance(self, instance, block_devices, extra_args):
+ def StartInstance(self, instance, block_devices, startup_paused):
"""Start an instance."""
raise NotImplementedError
- def StopInstance(self, instance, force=False):
- """Stop an instance."""
+ def StopInstance(self, instance, force=False, retry=False, name=None):
+ """Stop an instance
+
+ @type instance: L{objects.Instance}
+ @param instance: instance to stop
+ @type force: boolean
+ @param force: whether to do a "hard" stop (destroy)
+ @type retry: boolean
+ @param retry: whether this is just a retry call
+ @type name: string or None
+ @param name: if this parameter is passed, the the instance object
+ should not be used (will be passed as None), and the shutdown
+ must be done by name only
+
+ """
raise NotImplementedError
+ def CleanupInstance(self, instance_name):
+ """Cleanup after a stopped instance
+
+ This is an optional method, used by hypervisors that need to cleanup after
+ an instance has been stopped.
+
+ @type instance_name: string
+ @param instance_name: instance name to cleanup after
+
+ """
+ pass
+
def RebootInstance(self, instance):
"""Reboot an instance."""
raise NotImplementedError
- def ListInstances(self):
+ def ListInstances(self, hvparams=None):
"""Get the list of running instances."""
raise NotImplementedError
def GetInstanceInfo(self, instance_name):
"""Get instance properties.
+ @type instance_name: string
@param instance_name: the instance name
@return: tuple (name, id, memory, vcpus, state, times)
"""
raise NotImplementedError
- @staticmethod
- def GetShellCommandForConsole(instance):
- """Return a command for connecting to the console of an instance.
+ @classmethod
+ def GetInstanceConsole(cls, instance, hvparams, beparams):
+ """Return information for connecting to the console of an instance.
"""
raise NotImplementedError
- def Verify(self):
+ @classmethod
+ def GetAncillaryFiles(cls):
+ """Return a list of ancillary files to be copied to all nodes as ancillary
+ configuration files.
+
+ @rtype: (list of absolute paths, list of absolute paths)
+ @return: (all files, optional files)
+
+ """
+ # By default we return a member variable, so that if an hypervisor has just
+ # a static list of files it doesn't have to override this function.
+ assert set(cls.ANCILLARY_FILES).issuperset(cls.ANCILLARY_FILES_OPT), \
+ "Optional ancillary files must be a subset of ancillary files"
+
+ return (cls.ANCILLARY_FILES, cls.ANCILLARY_FILES_OPT)
+
+ def Verify(self, hvparams=None):
"""Verify the hypervisor.
+ @type hvparams: dict of strings
+ @param hvparams: hypervisor parameters to be verified against
+
+ @return: Problem description if something is wrong, C{None} otherwise
+
"""
raise NotImplementedError
- def MigrateInstance(self, name, target, live):
+ def MigrationInfo(self, instance): # pylint: disable=R0201,W0613
+ """Get instance information to perform a migration.
+
+ By default assume no information is needed.
+
+ @type instance: L{objects.Instance}
+ @param instance: instance to be migrated
+ @rtype: string/data (opaque)
+ @return: instance migration information - serialized form
+
+ """
+ return ""
+
+ def AcceptInstance(self, instance, info, target):
+ """Prepare to accept an instance.
+
+ By default assume no preparation is needed.
+
+ @type instance: L{objects.Instance}
+ @param instance: instance to be accepted
+ @type info: string/data (opaque)
+ @param info: migration information, from the source node
+ @type target: string
+ @param target: target host (usually ip), on this node
+
+ """
+ pass
+
+ def BalloonInstanceMemory(self, instance, mem):
+ """Balloon an instance memory to a certain value.
+
+ @type instance: L{objects.Instance}
+ @param instance: instance to be accepted
+ @type mem: int
+ @param mem: actual memory size to use for instance runtime
+
+ """
+ raise NotImplementedError
+
+ def FinalizeMigrationDst(self, instance, info, success):
+ """Finalize the instance migration on the target node.
+
+ Should finalize or revert any preparation done to accept the instance.
+ Since by default we do no preparation, we also don't have anything to do
+
+ @type instance: L{objects.Instance}
+ @param instance: instance whose migration is being finalized
+ @type info: string/data (opaque)
+ @param info: migration information, from the source node
+ @type success: boolean
+ @param success: whether the migration was a success or a failure
+
+ """
+ pass
+
+ def MigrateInstance(self, instance, target, live):
"""Migrate an instance.
- Arguments:
- - name: the name of the instance
- - target: the target of the migration (usually will be IP and not name)
- - live: whether to do live migration or not
+ @type instance: L{objects.Instance}
+ @param instance: the instance to be migrated
+ @type target: string
+ @param target: hostname (usually ip) of the target node
+ @type live: boolean
+ @param live: whether to do a live or non-live migration
+
+ """
+ raise NotImplementedError
+
+ def FinalizeMigrationSource(self, instance, success, live):
+ """Finalize the instance migration on the source node.
+
+ @type instance: L{objects.Instance}
+ @param instance: the instance that was migrated
+ @type success: bool
+ @param success: whether the migration succeeded or not
+ @type live: bool
+ @param live: whether the user requested a live migration or not
- Returns: none, errors will be signaled by exception.
+ """
+ pass
+
+ def GetMigrationStatus(self, instance):
+ """Get the migration status
+
+ @type instance: L{objects.Instance}
+ @param instance: the instance that is being migrated
+ @rtype: L{objects.MigrationStatus}
+ @return: the status of the current migration (one of
+ L{constants.HV_MIGRATION_VALID_STATUSES}), plus any additional
+ progress info that can be retrieved from the hypervisor
"""
raise NotImplementedError
+ def _InstanceStartupMemory(self, instance):
+ """Get the correct startup memory for an instance
+
+ This function calculates how much memory an instance should be started
+ with, making sure it's a value between the minimum and the maximum memory,
+ but also trying to use no more than the current free memory on the node.
+
+ @type instance: L{objects.Instance}
+ @param instance: the instance that is being started
+ @rtype: integer
+ @return: memory the instance should be started with
+
+ """
+ free_memory = self.GetNodeInfo()["memory_free"]
+ max_start_mem = min(instance.beparams[constants.BE_MAXMEM], free_memory)
+ start_mem = max(instance.beparams[constants.BE_MINMEM], max_start_mem)
+ return start_mem
@classmethod
def CheckParameterSyntax(cls, hvparams):
"""
for key in hvparams:
if key not in cls.PARAMETERS:
- raise errors.HypervisorError("Hypervisor parameter '%s'"
- " not supported" % key)
- for key in cls.PARAMETERS:
- if key not in hvparams:
- raise errors.HypervisorError("Hypervisor parameter '%s'"
- " missing" % key)
-
- def ValidateParameters(self, hvparams):
+ raise errors.HypervisorError("Parameter '%s' is not supported" % key)
+
+ # cheap tests that run on the master, should not access the world
+ for name, (required, check_fn, errstr, _, _) in cls.PARAMETERS.items():
+ if name not in hvparams:
+ raise errors.HypervisorError("Parameter '%s' is missing" % name)
+ value = hvparams[name]
+ if not required and not value:
+ continue
+ if not value:
+ raise errors.HypervisorError("Parameter '%s' is required but"
+ " is currently not defined" % (name, ))
+ if check_fn is not None and not check_fn(value):
+ raise errors.HypervisorError("Parameter '%s' fails syntax"
+ " check: %s (current value: '%s')" %
+ (name, errstr, value))
+
+ @classmethod
+ def ValidateParameters(cls, hvparams):
"""Check the given parameters for validity.
This should check the passed set of parameters for
@raise errors.HypervisorError: when a parameter is not valid
"""
- pass
+ for name, (required, _, _, check_fn, errstr) in cls.PARAMETERS.items():
+ value = hvparams[name]
+ if not required and not value:
+ continue
+ if check_fn is not None and not check_fn(value):
+ raise errors.HypervisorError("Parameter '%s' fails"
+ " validation: %s (current value: '%s')" %
+ (name, errstr, value))
+
+ @classmethod
+ def PowercycleNode(cls):
+ """Hard powercycle a node using hypervisor specific methods.
+
+ This method should hard powercycle the node, using whatever
+ methods the hypervisor provides. Note that this means that all
+ instances running on the node must be stopped too.
+
+ """
+ raise NotImplementedError
+
+ @staticmethod
+ def GetLinuxNodeInfo():
+ """For linux systems, return actual OS information.
+
+ This is an abstraction for all non-hypervisor-based classes, where
+ the node actually sees all the memory and CPUs via the /proc
+ interface and standard commands. The other case if for example
+ xen, where you only see the hardware resources via xen-specific
+ tools.
+
+ @return: a dict with the following keys (values in MiB):
+ - memory_total: the total memory size on the node
+ - memory_free: the available memory on the node for instances
+ - memory_dom0: the memory used by the node itself, if available
+
+ """
+ try:
+ data = utils.ReadFile("/proc/meminfo").splitlines()
+ except EnvironmentError, err:
+ raise errors.HypervisorError("Failed to list node info: %s" % (err,))
+
+ result = {}
+ sum_free = 0
+ try:
+ for line in data:
+ splitfields = line.split(":", 1)
+
+ if len(splitfields) > 1:
+ key = splitfields[0].strip()
+ val = splitfields[1].strip()
+ if key == "MemTotal":
+ result["memory_total"] = int(val.split()[0]) / 1024
+ elif key in ("MemFree", "Buffers", "Cached"):
+ sum_free += int(val.split()[0]) / 1024
+ elif key == "Active":
+ result["memory_dom0"] = int(val.split()[0]) / 1024
+ except (ValueError, TypeError), err:
+ raise errors.HypervisorError("Failed to compute memory usage: %s" %
+ (err,))
+ result["memory_free"] = sum_free
+
+ cpu_total = 0
+ try:
+ fh = open("/proc/cpuinfo")
+ try:
+ cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",
+ fh.read()))
+ finally:
+ fh.close()
+ except EnvironmentError, err:
+ raise errors.HypervisorError("Failed to list node info: %s" % (err,))
+ result["cpu_total"] = cpu_total
+ # FIXME: export correct data here
+ result["cpu_nodes"] = 1
+ result["cpu_sockets"] = 1
+
+ return result
+
+ @classmethod
+ def LinuxPowercycle(cls):
+ """Linux-specific powercycle method.
+
+ """
+ try:
+ fd = os.open("/proc/sysrq-trigger", os.O_WRONLY)
+ try:
+ os.write(fd, "b")
+ finally:
+ fd.close()
+ except OSError:
+ logging.exception("Can't open the sysrq-trigger file")
+ result = utils.RunCmd(["reboot", "-n", "-f"])
+ if not result:
+ logging.error("Can't run shutdown: %s", result.output)
+
+ @staticmethod
+ def _FormatVerifyResults(msgs):
+ """Formats the verification results, given a list of errors.
+
+ @param msgs: list of errors, possibly empty
+ @return: overall problem description if something is wrong,
+ C{None} otherwise
+
+ """
+ if msgs:
+ return "; ".join(msgs)
+ else:
+ return None
projects / ganeti-local / blobdiff