root / lib / hypervisor / hv_fake.py @ 98c98ab9
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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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"""Fake hypervisor
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"""
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import os |
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import os.path |
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import logging |
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from ganeti import utils |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti.hypervisor import hv_base |
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class FakeHypervisor(hv_base.BaseHypervisor): |
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"""Fake hypervisor interface.
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This can be used for testing the ganeti code without having to have
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a real virtualisation software installed.
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"""
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CAN_MIGRATE = True
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_ROOT_DIR = constants.RUN_DIR + "/ganeti-fake-hypervisor"
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def __init__(self): |
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hv_base.BaseHypervisor.__init__(self)
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utils.EnsureDirs([(self._ROOT_DIR, constants.RUN_DIRS_MODE)])
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def ListInstances(self): |
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"""Get the list of running instances.
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"""
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return os.listdir(self._ROOT_DIR) |
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def GetInstanceInfo(self, instance_name): |
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"""Get instance properties.
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@param instance_name: the instance name
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@return: tuple of (name, id, memory, vcpus, stat, times)
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"""
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file_name = self._InstanceFile(instance_name)
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if not os.path.exists(file_name): |
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return None |
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try:
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fh = open(file_name, "r") |
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try:
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inst_id = fh.readline().strip() |
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memory = utils.TryConvert(int, fh.readline().strip())
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vcpus = utils.TryConvert(int, fh.readline().strip())
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stat = "---b-"
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times = "0"
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return (instance_name, inst_id, memory, vcpus, stat, times)
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finally:
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fh.close() |
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except IOError, err: |
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raise errors.HypervisorError("Failed to list instance %s: %s" % |
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(instance_name, err)) |
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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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data = [] |
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for file_name in os.listdir(self._ROOT_DIR): |
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try:
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fh = open(utils.PathJoin(self._ROOT_DIR, file_name), "r") |
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inst_id = "-1"
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memory = 0
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vcpus = 1
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stat = "-----"
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times = "-1"
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try:
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inst_id = fh.readline().strip() |
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memory = utils.TryConvert(int, fh.readline().strip())
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vcpus = utils.TryConvert(int, fh.readline().strip())
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stat = "---b-"
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times = "0"
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finally:
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fh.close() |
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data.append((file_name, inst_id, memory, vcpus, stat, times)) |
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except IOError, err: |
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raise errors.HypervisorError("Failed to list instances: %s" % err) |
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return data
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@classmethod
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def _InstanceFile(cls, instance_name): |
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"""Compute the instance file for an instance name.
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"""
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return utils.PathJoin(cls._ROOT_DIR, instance_name)
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def _IsAlive(self, instance_name): |
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"""Checks if an instance is alive.
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"""
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file_name = self._InstanceFile(instance_name)
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return os.path.exists(file_name)
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def _MarkUp(self, instance): |
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"""Mark the instance as running.
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This does no checks, which should be done by its callers.
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"""
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file_name = self._InstanceFile(instance.name)
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fh = file(file_name, "w") |
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try:
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fh.write("0\n%d\n%d\n" %
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(instance.beparams[constants.BE_MEMORY], |
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instance.beparams[constants.BE_VCPUS])) |
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finally:
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fh.close() |
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def _MarkDown(self, instance_name): |
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"""Mark the instance as running.
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This does no checks, which should be done by its callers.
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"""
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file_name = self._InstanceFile(instance_name)
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utils.RemoveFile(file_name) |
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def StartInstance(self, instance, block_devices): |
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"""Start an instance.
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For the fake hypervisor, it just creates a file in the base dir,
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creating an exception if it already exists. We don't actually
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handle race conditions properly, since these are *FAKE* instances.
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"""
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if self._IsAlive(instance.name): |
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raise errors.HypervisorError("Failed to start instance %s: %s" % |
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(instance.name, "already running"))
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try:
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self._MarkUp(instance)
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except IOError, err: |
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raise errors.HypervisorError("Failed to start instance %s: %s" % |
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(instance.name, err)) |
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def StopInstance(self, instance, force=False, retry=False, name=None): |
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"""Stop an instance.
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For the fake hypervisor, this just removes the file in the base
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dir, if it exist, otherwise we raise an exception.
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"""
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if name is None: |
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name = instance.name |
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if not self._IsAlive(name): |
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raise errors.HypervisorError("Failed to stop instance %s: %s" % |
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(name, "not running"))
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self._MarkDown(name)
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def RebootInstance(self, instance): |
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"""Reboot an instance.
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For the fake hypervisor, this does nothing.
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"""
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return
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def GetNodeInfo(self): |
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"""Return information about the node.
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This is just a wrapper over the base GetLinuxNodeInfo method.
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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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result = self.GetLinuxNodeInfo()
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# substract running instances
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all_instances = self.GetAllInstancesInfo()
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result['memory_free'] -= min(result['memory_free'], |
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sum([row[2] for row in all_instances])) |
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return result
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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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return "echo Console not available for fake hypervisor" |
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def Verify(self): |
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"""Verify the hypervisor.
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For the fake hypervisor, it just checks the existence of the base
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dir.
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"""
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if not os.path.exists(self._ROOT_DIR): |
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return "The required directory '%s' does not exist." % self._ROOT_DIR |
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@classmethod
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def PowercycleNode(cls): |
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"""Fake hypervisor powercycle, just a wrapper over Linux powercycle.
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"""
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cls.LinuxPowercycle() |
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def AcceptInstance(self, instance, info, target): |
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"""Prepare to accept an instance.
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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
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@param info: instance info, not used
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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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if self._IsAlive(instance.name): |
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raise errors.HypervisorError("Can't accept instance, already running") |
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def MigrateInstance(self, instance, target, live): |
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"""Migrate an instance.
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@type instance: L{objects.Instance}
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@param instance: 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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logging.debug("Fake hypervisor migrating %s to %s (live=%s)",
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instance, target, live) |
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self._MarkDown(instance.name)
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def FinalizeMigration(self, instance, info, success): |
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"""Finalize an instance migration.
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For the fake hv, this just marks the instance up.
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@type instance: L{objects.Instance}
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@param instance: instance whose migration is being finalized
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"""
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if success:
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self._MarkUp(instance)
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else:
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# ensure it's down
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self._MarkDown(instance.name)
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