root / lib / hypervisor / hv_kvm.py @ 14f5f1b6
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# Copyright (C) 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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"""KVM hypervisor
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"""
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import errno |
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import os |
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import os.path |
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import re |
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import tempfile |
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import time |
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import logging |
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import pwd |
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from cStringIO import StringIO |
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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 import serializer |
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from ganeti import objects |
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from ganeti import uidpool |
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from ganeti import ssconf |
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from ganeti.hypervisor import hv_base |
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class KVMHypervisor(hv_base.BaseHypervisor): |
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"""KVM hypervisor interface"""
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CAN_MIGRATE = True
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_ROOT_DIR = constants.RUN_GANETI_DIR + "/kvm-hypervisor"
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_PIDS_DIR = _ROOT_DIR + "/pid" # contains live instances pids |
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_UIDS_DIR = _ROOT_DIR + "/uid" # contains instances reserved uids |
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_CTRL_DIR = _ROOT_DIR + "/ctrl" # contains instances control sockets |
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_CONF_DIR = _ROOT_DIR + "/conf" # contains instances startup data |
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# KVM instances with chroot enabled are started in empty chroot directories.
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_CHROOT_DIR = _ROOT_DIR + "/chroot" # for empty chroot directories |
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# After an instance is stopped, its chroot directory is removed.
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# If the chroot directory is not empty, it can't be removed.
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# A non-empty chroot directory indicates a possible security incident.
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# To support forensics, the non-empty chroot directory is quarantined in
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# a separate directory, called 'chroot-quarantine'.
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_CHROOT_QUARANTINE_DIR = _ROOT_DIR + "/chroot-quarantine"
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_DIRS = [_ROOT_DIR, _PIDS_DIR, _UIDS_DIR, _CTRL_DIR, _CONF_DIR, |
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_CHROOT_DIR, _CHROOT_QUARANTINE_DIR] |
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PARAMETERS = { |
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constants.HV_KERNEL_PATH: hv_base.OPT_FILE_CHECK, |
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constants.HV_INITRD_PATH: hv_base.OPT_FILE_CHECK, |
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constants.HV_ROOT_PATH: hv_base.NO_CHECK, |
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constants.HV_KERNEL_ARGS: hv_base.NO_CHECK, |
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constants.HV_ACPI: hv_base.NO_CHECK, |
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constants.HV_SERIAL_CONSOLE: hv_base.NO_CHECK, |
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constants.HV_VNC_BIND_ADDRESS: |
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(False, lambda x: (utils.IsValidIP(x) or utils.IsNormAbsPath(x)), |
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"the VNC bind address must be either a valid IP address or an absolute"
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" pathname", None, None), |
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constants.HV_VNC_TLS: hv_base.NO_CHECK, |
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constants.HV_VNC_X509: hv_base.OPT_DIR_CHECK, |
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constants.HV_VNC_X509_VERIFY: hv_base.NO_CHECK, |
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constants.HV_VNC_PASSWORD_FILE: hv_base.OPT_FILE_CHECK, |
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constants.HV_CDROM_IMAGE_PATH: hv_base.OPT_FILE_CHECK, |
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constants.HV_BOOT_ORDER: |
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hv_base.ParamInSet(True, constants.HT_KVM_VALID_BO_TYPES),
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constants.HV_NIC_TYPE: |
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hv_base.ParamInSet(True, constants.HT_KVM_VALID_NIC_TYPES),
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constants.HV_DISK_TYPE: |
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hv_base.ParamInSet(True, constants.HT_KVM_VALID_DISK_TYPES),
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constants.HV_USB_MOUSE: |
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hv_base.ParamInSet(False, constants.HT_KVM_VALID_MOUSE_TYPES),
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constants.HV_MIGRATION_PORT: hv_base.NET_PORT_CHECK, |
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constants.HV_MIGRATION_BANDWIDTH: hv_base.NO_CHECK, |
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constants.HV_MIGRATION_DOWNTIME: hv_base.NO_CHECK, |
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constants.HV_USE_LOCALTIME: hv_base.NO_CHECK, |
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constants.HV_DISK_CACHE: |
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hv_base.ParamInSet(True, constants.HT_VALID_CACHE_TYPES),
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constants.HV_SECURITY_MODEL: |
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hv_base.ParamInSet(True, constants.HT_KVM_VALID_SM_TYPES),
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constants.HV_SECURITY_DOMAIN: hv_base.NO_CHECK, |
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constants.HV_KVM_FLAG: |
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hv_base.ParamInSet(False, constants.HT_KVM_FLAG_VALUES),
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constants.HV_VHOST_NET: hv_base.NO_CHECK, |
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constants.HV_KVM_USE_CHROOT: hv_base.NO_CHECK, |
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} |
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_MIGRATION_STATUS_RE = re.compile('Migration\s+status:\s+(\w+)',
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re.M | re.I) |
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_MIGRATION_INFO_MAX_BAD_ANSWERS = 5
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_MIGRATION_INFO_RETRY_DELAY = 2
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_KVM_NETWORK_SCRIPT = constants.SYSCONFDIR + "/ganeti/kvm-vif-bridge"
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ANCILLARY_FILES = [ |
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_KVM_NETWORK_SCRIPT, |
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] |
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def __init__(self): |
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hv_base.BaseHypervisor.__init__(self)
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# Let's make sure the directories we need exist, even if the RUN_DIR lives
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# in a tmpfs filesystem or has been otherwise wiped out.
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dirs = [(dname, constants.RUN_DIRS_MODE) for dname in self._DIRS] |
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utils.EnsureDirs(dirs) |
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@classmethod
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def _InstancePidFile(cls, instance_name): |
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"""Returns the instance pidfile.
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"""
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return utils.PathJoin(cls._PIDS_DIR, instance_name)
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@classmethod
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def _InstanceUidFile(cls, instance_name): |
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"""Returns the instance uidfile.
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"""
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return utils.PathJoin(cls._UIDS_DIR, instance_name)
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@classmethod
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def _InstancePidInfo(cls, pid): |
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"""Check pid file for instance information.
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Check that a pid file is associated with an instance, and retrieve
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information from its command line.
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@type pid: string or int
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@param pid: process id of the instance to check
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@rtype: tuple
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@return: (instance_name, memory, vcpus)
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@raise errors.HypervisorError: when an instance cannot be found
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"""
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alive = utils.IsProcessAlive(pid) |
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if not alive: |
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raise errors.HypervisorError("Cannot get info for pid %s" % pid) |
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cmdline_file = utils.PathJoin("/proc", str(pid), "cmdline") |
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try:
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cmdline = utils.ReadFile(cmdline_file) |
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except EnvironmentError, err: |
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raise errors.HypervisorError("Can't open cmdline file for pid %s: %s" % |
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(pid, err)) |
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instance = None
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memory = 0
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vcpus = 0
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arg_list = cmdline.split('\x00')
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while arg_list:
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arg = arg_list.pop(0)
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if arg == "-name": |
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instance = arg_list.pop(0)
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elif arg == "-m": |
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memory = int(arg_list.pop(0)) |
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elif arg == "-smp": |
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vcpus = int(arg_list.pop(0)) |
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if instance is None: |
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raise errors.HypervisorError("Pid %s doesn't contain a ganeti kvm" |
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" instance" % pid)
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return (instance, memory, vcpus)
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def _InstancePidAlive(self, instance_name): |
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"""Returns the instance pidfile, pid, and liveness.
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@type instance_name: string
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@param instance_name: instance name
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@rtype: tuple
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@return: (pid file name, pid, liveness)
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"""
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pidfile = self._InstancePidFile(instance_name)
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pid = utils.ReadPidFile(pidfile) |
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alive = False
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try:
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cmd_instance = self._InstancePidInfo(pid)[0] |
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alive = (cmd_instance == instance_name) |
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except errors.HypervisorError:
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pass
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return (pidfile, pid, alive)
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def _CheckDown(self, instance_name): |
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"""Raises an error unless the given instance is down.
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"""
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alive = self._InstancePidAlive(instance_name)[2] |
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if alive:
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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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@classmethod
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def _InstanceMonitor(cls, instance_name): |
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"""Returns the instance monitor socket name
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"""
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return utils.PathJoin(cls._CTRL_DIR, "%s.monitor" % instance_name) |
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@classmethod
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def _InstanceSerial(cls, instance_name): |
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"""Returns the instance serial socket name
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"""
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return utils.PathJoin(cls._CTRL_DIR, "%s.serial" % instance_name) |
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@staticmethod
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def _SocatUnixConsoleParams(): |
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"""Returns the correct parameters for socat
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If we have a new-enough socat we can use raw mode with an escape character.
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"""
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if constants.SOCAT_USE_ESCAPE:
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return "raw,echo=0,escape=%s" % constants.SOCAT_ESCAPE_CODE |
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else:
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return "echo=0,icanon=0" |
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@classmethod
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def _InstanceKVMRuntime(cls, instance_name): |
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"""Returns the instance KVM runtime filename
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"""
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return utils.PathJoin(cls._CONF_DIR, "%s.runtime" % instance_name) |
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@classmethod
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def _InstanceChrootDir(cls, instance_name): |
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"""Returns the name of the KVM chroot dir of the instance
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"""
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return utils.PathJoin(cls._CHROOT_DIR, instance_name)
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@classmethod
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def _TryReadUidFile(cls, uid_file): |
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"""Try to read a uid file
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"""
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if os.path.exists(uid_file):
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try:
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uid = int(utils.ReadOneLineFile(uid_file))
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return uid
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except EnvironmentError: |
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logging.warning("Can't read uid file", exc_info=True) |
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except (TypeError, ValueError): |
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logging.warning("Can't parse uid file contents", exc_info=True) |
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return None |
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@classmethod
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def _RemoveInstanceRuntimeFiles(cls, pidfile, instance_name): |
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"""Removes an instance's rutime sockets/files/dirs.
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"""
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utils.RemoveFile(pidfile) |
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utils.RemoveFile(cls._InstanceMonitor(instance_name)) |
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utils.RemoveFile(cls._InstanceSerial(instance_name)) |
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utils.RemoveFile(cls._InstanceKVMRuntime(instance_name)) |
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uid_file = cls._InstanceUidFile(instance_name) |
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uid = cls._TryReadUidFile(uid_file) |
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utils.RemoveFile(uid_file) |
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if uid is not None: |
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uidpool.ReleaseUid(uid) |
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try:
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chroot_dir = cls._InstanceChrootDir(instance_name) |
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utils.RemoveDir(chroot_dir) |
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except OSError, err: |
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if err.errno == errno.ENOTEMPTY:
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# The chroot directory is expected to be empty, but it isn't.
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new_chroot_dir = tempfile.mkdtemp(dir=cls._CHROOT_QUARANTINE_DIR, |
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prefix="%s-%s-" %
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(instance_name, |
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utils.TimestampForFilename())) |
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logging.warning("The chroot directory of instance %s can not be"
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" removed as it is not empty. Moving it to the"
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" quarantine instead. Please investigate the"
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" contents (%s) and clean up manually",
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instance_name, new_chroot_dir) |
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utils.RenameFile(chroot_dir, new_chroot_dir) |
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else:
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raise
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def _WriteNetScript(self, instance, seq, nic): |
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"""Write a script to connect a net interface to the proper bridge.
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This can be used by any qemu-type hypervisor.
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@param instance: instance we're acting on
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@type instance: instance object
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@param seq: nic sequence number
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@type seq: int
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@param nic: nic we're acting on
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@type nic: nic object
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@return: netscript file name
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@rtype: string
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"""
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script = StringIO() |
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script.write("#!/bin/sh\n")
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script.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
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script.write("PATH=$PATH:/sbin:/usr/sbin\n")
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script.write("export INSTANCE=%s\n" % instance.name)
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script.write("export MAC=%s\n" % nic.mac)
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if nic.ip:
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script.write("export IP=%s\n" % nic.ip)
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script.write("export MODE=%s\n" % nic.nicparams[constants.NIC_MODE])
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if nic.nicparams[constants.NIC_LINK]:
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script.write("export LINK=%s\n" % nic.nicparams[constants.NIC_LINK])
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if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
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script.write("export BRIDGE=%s\n" % nic.nicparams[constants.NIC_LINK])
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script.write("export INTERFACE=$1\n")
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if instance.tags:
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script.write("export TAGS=\"%s\"\n" % " ".join(instance.tags)) |
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# TODO: make this configurable at ./configure time
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script.write("if [ -x '%s' ]; then\n" % self._KVM_NETWORK_SCRIPT) |
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script.write(" # Execute the user-specific vif file\n")
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script.write(" %s\n" % self._KVM_NETWORK_SCRIPT) |
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script.write("else\n")
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script.write(" ifconfig $INTERFACE 0.0.0.0 up\n")
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if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
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script.write(" # Connect the interface to the bridge\n")
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script.write(" brctl addif $BRIDGE $INTERFACE\n")
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elif nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_ROUTED:
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if not nic.ip: |
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raise errors.HypervisorError("nic/%d is routed, but has no ip." % seq) |
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script.write(" # Route traffic targeted at the IP to the interface\n")
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if nic.nicparams[constants.NIC_LINK]:
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script.write(" while ip rule del dev $INTERFACE; do :; done\n")
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script.write(" ip rule add dev $INTERFACE table $LINK\n")
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script.write(" ip route replace $IP table $LINK proto static"
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" dev $INTERFACE\n")
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else:
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script.write(" ip route replace $IP proto static"
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" dev $INTERFACE\n")
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interface_v4_conf = "/proc/sys/net/ipv4/conf/$INTERFACE"
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interface_v6_conf = "/proc/sys/net/ipv6/conf/$INTERFACE"
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script.write(" if [ -d %s ]; then\n" % interface_v4_conf)
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script.write(" echo 1 > %s/proxy_arp\n" % interface_v4_conf)
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script.write(" echo 1 > %s/forwarding\n" % interface_v4_conf)
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script.write(" fi\n")
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script.write(" if [ -d %s ]; then\n" % interface_v6_conf)
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script.write(" echo 1 > %s/proxy_ndp\n" % interface_v6_conf)
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script.write(" echo 1 > %s/forwarding\n" % interface_v6_conf)
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script.write(" fi\n")
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script.write("fi\n\n")
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# As much as we'd like to put this in our _ROOT_DIR, that will happen to be
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# mounted noexec sometimes, so we'll have to find another place.
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(tmpfd, tmpfile_name) = tempfile.mkstemp() |
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tmpfile = os.fdopen(tmpfd, 'w')
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try:
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tmpfile.write(script.getvalue()) |
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finally:
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tmpfile.close() |
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os.chmod(tmpfile_name, 0755)
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return tmpfile_name
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def ListInstances(self): |
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"""Get the list of running instances.
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We can do this by listing our live instances directory and
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checking whether the associated kvm process is still alive.
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"""
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result = [] |
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for name in os.listdir(self._PIDS_DIR): |
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if self._InstancePidAlive(name)[2]: |
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result.append(name) |
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return result
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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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@rtype: tuple of strings
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@return: (name, id, memory, vcpus, stat, times)
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"""
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_, pid, alive = self._InstancePidAlive(instance_name)
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if not alive: |
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return None |
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_, memory, vcpus = self._InstancePidInfo(pid)
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stat = "---b-"
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times = "0"
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return (instance_name, pid, memory, vcpus, stat, times)
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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 name in os.listdir(self._PIDS_DIR): |
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try:
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info = self.GetInstanceInfo(name)
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except errors.HypervisorError:
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continue
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if info:
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data.append(info) |
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return data
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|
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def _GenerateKVMRuntime(self, instance, block_devices): |
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"""Generate KVM information to start an instance.
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|
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"""
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pidfile = self._InstancePidFile(instance.name)
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kvm = constants.KVM_PATH |
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kvm_cmd = [kvm] |
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# used just by the vnc server, if enabled
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kvm_cmd.extend(['-name', instance.name])
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kvm_cmd.extend(['-m', instance.beparams[constants.BE_MEMORY]])
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kvm_cmd.extend(['-smp', instance.beparams[constants.BE_VCPUS]])
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kvm_cmd.extend(['-pidfile', pidfile])
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kvm_cmd.extend(['-daemonize'])
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if not instance.hvparams[constants.HV_ACPI]: |
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kvm_cmd.extend(['-no-acpi'])
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|
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hvp = instance.hvparams |
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boot_disk = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_DISK |
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boot_cdrom = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_CDROM |
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boot_network = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_NETWORK |
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|
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if hvp[constants.HV_KVM_FLAG] == constants.HT_KVM_ENABLED:
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kvm_cmd.extend(["-enable-kvm"])
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elif hvp[constants.HV_KVM_FLAG] == constants.HT_KVM_DISABLED:
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kvm_cmd.extend(["-disable-kvm"])
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|
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if boot_network:
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kvm_cmd.extend(['-boot', 'n']) |
450 |
|
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disk_type = hvp[constants.HV_DISK_TYPE] |
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if disk_type == constants.HT_DISK_PARAVIRTUAL:
|
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if_val = ',if=virtio'
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454 |
else:
|
455 |
if_val = ',if=%s' % disk_type
|
456 |
# Cache mode
|
457 |
disk_cache = hvp[constants.HV_DISK_CACHE] |
458 |
if disk_cache != constants.HT_CACHE_DEFAULT:
|
459 |
cache_val = ",cache=%s" % disk_cache
|
460 |
else:
|
461 |
cache_val = ""
|
462 |
for cfdev, dev_path in block_devices: |
463 |
if cfdev.mode != constants.DISK_RDWR:
|
464 |
raise errors.HypervisorError("Instance has read-only disks which" |
465 |
" are not supported by KVM")
|
466 |
# TODO: handle FD_LOOP and FD_BLKTAP (?)
|
467 |
if boot_disk:
|
468 |
kvm_cmd.extend(['-boot', 'c']) |
469 |
if disk_type != constants.HT_DISK_IDE:
|
470 |
boot_val = ',boot=on'
|
471 |
else:
|
472 |
boot_val = ''
|
473 |
# We only boot from the first disk
|
474 |
boot_disk = False
|
475 |
else:
|
476 |
boot_val = ''
|
477 |
|
478 |
drive_val = 'file=%s,format=raw%s%s%s' % (dev_path, if_val, boot_val,
|
479 |
cache_val) |
480 |
kvm_cmd.extend(['-drive', drive_val])
|
481 |
|
482 |
iso_image = hvp[constants.HV_CDROM_IMAGE_PATH] |
483 |
if iso_image:
|
484 |
options = ',format=raw,media=cdrom'
|
485 |
if boot_cdrom:
|
486 |
kvm_cmd.extend(['-boot', 'd']) |
487 |
if disk_type != constants.HT_DISK_IDE:
|
488 |
options = '%s,boot=on' % options
|
489 |
else:
|
490 |
if disk_type == constants.HT_DISK_PARAVIRTUAL:
|
491 |
if_val = ',if=virtio'
|
492 |
else:
|
493 |
if_val = ',if=%s' % disk_type
|
494 |
options = '%s%s' % (options, if_val)
|
495 |
drive_val = 'file=%s%s' % (iso_image, options)
|
496 |
kvm_cmd.extend(['-drive', drive_val])
|
497 |
|
498 |
kernel_path = hvp[constants.HV_KERNEL_PATH] |
499 |
if kernel_path:
|
500 |
kvm_cmd.extend(['-kernel', kernel_path])
|
501 |
initrd_path = hvp[constants.HV_INITRD_PATH] |
502 |
if initrd_path:
|
503 |
kvm_cmd.extend(['-initrd', initrd_path])
|
504 |
root_append = ['root=%s' % hvp[constants.HV_ROOT_PATH],
|
505 |
hvp[constants.HV_KERNEL_ARGS]] |
506 |
if hvp[constants.HV_SERIAL_CONSOLE]:
|
507 |
root_append.append('console=ttyS0,38400')
|
508 |
kvm_cmd.extend(['-append', ' '.join(root_append)]) |
509 |
|
510 |
mouse_type = hvp[constants.HV_USB_MOUSE] |
511 |
if mouse_type:
|
512 |
kvm_cmd.extend(['-usb'])
|
513 |
kvm_cmd.extend(['-usbdevice', mouse_type])
|
514 |
|
515 |
vnc_bind_address = hvp[constants.HV_VNC_BIND_ADDRESS] |
516 |
if vnc_bind_address:
|
517 |
if utils.IsValidIP(vnc_bind_address):
|
518 |
if instance.network_port > constants.VNC_BASE_PORT:
|
519 |
display = instance.network_port - constants.VNC_BASE_PORT |
520 |
if vnc_bind_address == constants.IP4_ADDRESS_ANY:
|
521 |
vnc_arg = ':%d' % (display)
|
522 |
else:
|
523 |
vnc_arg = '%s:%d' % (vnc_bind_address, display)
|
524 |
else:
|
525 |
logging.error("Network port is not a valid VNC display (%d < %d)."
|
526 |
" Not starting VNC", instance.network_port,
|
527 |
constants.VNC_BASE_PORT) |
528 |
vnc_arg = 'none'
|
529 |
|
530 |
# Only allow tls and other option when not binding to a file, for now.
|
531 |
# kvm/qemu gets confused otherwise about the filename to use.
|
532 |
vnc_append = ''
|
533 |
if hvp[constants.HV_VNC_TLS]:
|
534 |
vnc_append = '%s,tls' % vnc_append
|
535 |
if hvp[constants.HV_VNC_X509_VERIFY]:
|
536 |
vnc_append = '%s,x509verify=%s' % (vnc_append,
|
537 |
hvp[constants.HV_VNC_X509]) |
538 |
elif hvp[constants.HV_VNC_X509]:
|
539 |
vnc_append = '%s,x509=%s' % (vnc_append,
|
540 |
hvp[constants.HV_VNC_X509]) |
541 |
if hvp[constants.HV_VNC_PASSWORD_FILE]:
|
542 |
vnc_append = '%s,password' % vnc_append
|
543 |
|
544 |
vnc_arg = '%s%s' % (vnc_arg, vnc_append)
|
545 |
|
546 |
else:
|
547 |
vnc_arg = 'unix:%s/%s.vnc' % (vnc_bind_address, instance.name)
|
548 |
|
549 |
kvm_cmd.extend(['-vnc', vnc_arg])
|
550 |
|
551 |
# Also add a tablet USB device to act as a mouse
|
552 |
# This solves various mouse alignment issues
|
553 |
kvm_cmd.extend(['-usbdevice', 'tablet']) |
554 |
else:
|
555 |
kvm_cmd.extend(['-nographic'])
|
556 |
|
557 |
monitor_dev = ("unix:%s,server,nowait" %
|
558 |
self._InstanceMonitor(instance.name))
|
559 |
kvm_cmd.extend(['-monitor', monitor_dev])
|
560 |
if hvp[constants.HV_SERIAL_CONSOLE]:
|
561 |
serial_dev = ('unix:%s,server,nowait' %
|
562 |
self._InstanceSerial(instance.name))
|
563 |
kvm_cmd.extend(['-serial', serial_dev])
|
564 |
else:
|
565 |
kvm_cmd.extend(['-serial', 'none']) |
566 |
|
567 |
if hvp[constants.HV_USE_LOCALTIME]:
|
568 |
kvm_cmd.extend(['-localtime'])
|
569 |
|
570 |
if hvp[constants.HV_KVM_USE_CHROOT]:
|
571 |
kvm_cmd.extend(['-chroot', self._InstanceChrootDir(instance.name)]) |
572 |
|
573 |
# Save the current instance nics, but defer their expansion as parameters,
|
574 |
# as we'll need to generate executable temp files for them.
|
575 |
kvm_nics = instance.nics |
576 |
hvparams = hvp |
577 |
|
578 |
return (kvm_cmd, kvm_nics, hvparams)
|
579 |
|
580 |
def _WriteKVMRuntime(self, instance_name, data): |
581 |
"""Write an instance's KVM runtime
|
582 |
|
583 |
"""
|
584 |
try:
|
585 |
utils.WriteFile(self._InstanceKVMRuntime(instance_name),
|
586 |
data=data) |
587 |
except EnvironmentError, err: |
588 |
raise errors.HypervisorError("Failed to save KVM runtime file: %s" % err) |
589 |
|
590 |
def _ReadKVMRuntime(self, instance_name): |
591 |
"""Read an instance's KVM runtime
|
592 |
|
593 |
"""
|
594 |
try:
|
595 |
file_content = utils.ReadFile(self._InstanceKVMRuntime(instance_name))
|
596 |
except EnvironmentError, err: |
597 |
raise errors.HypervisorError("Failed to load KVM runtime file: %s" % err) |
598 |
return file_content
|
599 |
|
600 |
def _SaveKVMRuntime(self, instance, kvm_runtime): |
601 |
"""Save an instance's KVM runtime
|
602 |
|
603 |
"""
|
604 |
kvm_cmd, kvm_nics, hvparams = kvm_runtime |
605 |
serialized_nics = [nic.ToDict() for nic in kvm_nics] |
606 |
serialized_form = serializer.Dump((kvm_cmd, serialized_nics, hvparams)) |
607 |
self._WriteKVMRuntime(instance.name, serialized_form)
|
608 |
|
609 |
def _LoadKVMRuntime(self, instance, serialized_runtime=None): |
610 |
"""Load an instance's KVM runtime
|
611 |
|
612 |
"""
|
613 |
if not serialized_runtime: |
614 |
serialized_runtime = self._ReadKVMRuntime(instance.name)
|
615 |
loaded_runtime = serializer.Load(serialized_runtime) |
616 |
kvm_cmd, serialized_nics, hvparams = loaded_runtime |
617 |
kvm_nics = [objects.NIC.FromDict(snic) for snic in serialized_nics] |
618 |
return (kvm_cmd, kvm_nics, hvparams)
|
619 |
|
620 |
def _RunKVMCmd(self, name, kvm_cmd): |
621 |
"""Run the KVM cmd and check for errors
|
622 |
|
623 |
@type name: string
|
624 |
@param name: instance name
|
625 |
@type kvm_cmd: list of strings
|
626 |
@param kvm_cmd: runcmd input for kvm
|
627 |
|
628 |
"""
|
629 |
result = utils.RunCmd(kvm_cmd) |
630 |
if result.failed:
|
631 |
raise errors.HypervisorError("Failed to start instance %s: %s (%s)" % |
632 |
(name, result.fail_reason, result.output)) |
633 |
if not self._InstancePidAlive(name)[2]: |
634 |
raise errors.HypervisorError("Failed to start instance %s" % name) |
635 |
|
636 |
def _ExecuteKVMRuntime(self, instance, kvm_runtime, incoming=None): |
637 |
"""Execute a KVM cmd, after completing it with some last minute data
|
638 |
|
639 |
@type incoming: tuple of strings
|
640 |
@param incoming: (target_host_ip, port)
|
641 |
|
642 |
"""
|
643 |
# Small _ExecuteKVMRuntime hv parameters programming howto:
|
644 |
# - conf_hvp contains the parameters as configured on ganeti. they might
|
645 |
# have changed since the instance started; only use them if the change
|
646 |
# won't affect the inside of the instance (which hasn't been rebooted).
|
647 |
# - up_hvp contains the parameters as they were when the instance was
|
648 |
# started, plus any new parameter which has been added between ganeti
|
649 |
# versions: it is paramount that those default to a value which won't
|
650 |
# affect the inside of the instance as well.
|
651 |
conf_hvp = instance.hvparams |
652 |
name = instance.name |
653 |
self._CheckDown(name)
|
654 |
|
655 |
temp_files = [] |
656 |
|
657 |
kvm_cmd, kvm_nics, up_hvp = kvm_runtime |
658 |
up_hvp = objects.FillDict(conf_hvp, up_hvp) |
659 |
|
660 |
# We know it's safe to run as a different user upon migration, so we'll use
|
661 |
# the latest conf, from conf_hvp.
|
662 |
security_model = conf_hvp[constants.HV_SECURITY_MODEL] |
663 |
if security_model == constants.HT_SM_USER:
|
664 |
kvm_cmd.extend(["-runas", conf_hvp[constants.HV_SECURITY_DOMAIN]])
|
665 |
|
666 |
# We have reasons to believe changing something like the nic driver/type
|
667 |
# upon migration won't exactly fly with the instance kernel, so for nic
|
668 |
# related parameters we'll use up_hvp
|
669 |
if not kvm_nics: |
670 |
kvm_cmd.extend(["-net", "none"]) |
671 |
else:
|
672 |
tap_extra = ""
|
673 |
nic_type = up_hvp[constants.HV_NIC_TYPE] |
674 |
if nic_type == constants.HT_NIC_PARAVIRTUAL:
|
675 |
nic_model = "model=virtio"
|
676 |
if up_hvp[constants.HV_VHOST_NET]:
|
677 |
tap_extra = ",vhost=on"
|
678 |
else:
|
679 |
nic_model = "model=%s" % nic_type
|
680 |
|
681 |
for nic_seq, nic in enumerate(kvm_nics): |
682 |
nic_val = "nic,vlan=%s,macaddr=%s,%s" % (nic_seq, nic.mac, nic_model)
|
683 |
script = self._WriteNetScript(instance, nic_seq, nic)
|
684 |
tap_val = "tap,vlan=%s,script=%s%s" % (nic_seq, script, tap_extra)
|
685 |
kvm_cmd.extend(["-net", nic_val])
|
686 |
kvm_cmd.extend(["-net", tap_val])
|
687 |
temp_files.append(script) |
688 |
|
689 |
if incoming:
|
690 |
target, port = incoming |
691 |
kvm_cmd.extend(['-incoming', 'tcp:%s:%s' % (target, port)]) |
692 |
|
693 |
# Changing the vnc password doesn't bother the guest that much. At most it
|
694 |
# will surprise people who connect to it. Whether positively or negatively
|
695 |
# it's debatable.
|
696 |
vnc_pwd_file = conf_hvp[constants.HV_VNC_PASSWORD_FILE] |
697 |
vnc_pwd = None
|
698 |
if vnc_pwd_file:
|
699 |
try:
|
700 |
vnc_pwd = utils.ReadOneLineFile(vnc_pwd_file, strict=True)
|
701 |
except EnvironmentError, err: |
702 |
raise errors.HypervisorError("Failed to open VNC password file %s: %s" |
703 |
% (vnc_pwd_file, err)) |
704 |
|
705 |
if conf_hvp[constants.HV_KVM_USE_CHROOT]:
|
706 |
utils.EnsureDirs([(self._InstanceChrootDir(name),
|
707 |
constants.SECURE_DIR_MODE)]) |
708 |
|
709 |
if security_model == constants.HT_SM_POOL:
|
710 |
ss = ssconf.SimpleStore() |
711 |
uid_pool = uidpool.ParseUidPool(ss.GetUidPool(), separator="\n")
|
712 |
all_uids = set(uidpool.ExpandUidPool(uid_pool))
|
713 |
uid = uidpool.RequestUnusedUid(all_uids) |
714 |
try:
|
715 |
username = pwd.getpwuid(uid.GetUid()).pw_name |
716 |
kvm_cmd.extend(["-runas", username])
|
717 |
self._RunKVMCmd(name, kvm_cmd)
|
718 |
except:
|
719 |
uidpool.ReleaseUid(uid) |
720 |
raise
|
721 |
else:
|
722 |
uid.Unlock() |
723 |
utils.WriteFile(self._InstanceUidFile(name), data=str(uid)) |
724 |
else:
|
725 |
self._RunKVMCmd(name, kvm_cmd)
|
726 |
|
727 |
if vnc_pwd:
|
728 |
change_cmd = 'change vnc password %s' % vnc_pwd
|
729 |
self._CallMonitorCommand(instance.name, change_cmd)
|
730 |
|
731 |
for filename in temp_files: |
732 |
utils.RemoveFile(filename) |
733 |
|
734 |
def StartInstance(self, instance, block_devices): |
735 |
"""Start an instance.
|
736 |
|
737 |
"""
|
738 |
self._CheckDown(instance.name)
|
739 |
kvm_runtime = self._GenerateKVMRuntime(instance, block_devices)
|
740 |
self._SaveKVMRuntime(instance, kvm_runtime)
|
741 |
self._ExecuteKVMRuntime(instance, kvm_runtime)
|
742 |
|
743 |
def _CallMonitorCommand(self, instance_name, command): |
744 |
"""Invoke a command on the instance monitor.
|
745 |
|
746 |
"""
|
747 |
socat = ("echo %s | %s STDIO UNIX-CONNECT:%s" %
|
748 |
(utils.ShellQuote(command), |
749 |
constants.SOCAT_PATH, |
750 |
utils.ShellQuote(self._InstanceMonitor(instance_name))))
|
751 |
result = utils.RunCmd(socat) |
752 |
if result.failed:
|
753 |
msg = ("Failed to send command '%s' to instance %s."
|
754 |
" output: %s, error: %s, fail_reason: %s" %
|
755 |
(command, instance_name, |
756 |
result.stdout, result.stderr, result.fail_reason)) |
757 |
raise errors.HypervisorError(msg)
|
758 |
|
759 |
return result
|
760 |
|
761 |
def StopInstance(self, instance, force=False, retry=False, name=None): |
762 |
"""Stop an instance.
|
763 |
|
764 |
"""
|
765 |
if name is not None and not force: |
766 |
raise errors.HypervisorError("Cannot shutdown cleanly by name only") |
767 |
if name is None: |
768 |
name = instance.name |
769 |
acpi = instance.hvparams[constants.HV_ACPI] |
770 |
else:
|
771 |
acpi = False
|
772 |
_, pid, alive = self._InstancePidAlive(name)
|
773 |
if pid > 0 and alive: |
774 |
if force or not acpi: |
775 |
utils.KillProcess(pid) |
776 |
else:
|
777 |
self._CallMonitorCommand(name, 'system_powerdown') |
778 |
|
779 |
def CleanupInstance(self, instance_name): |
780 |
"""Cleanup after a stopped instance
|
781 |
|
782 |
"""
|
783 |
pidfile, pid, alive = self._InstancePidAlive(instance_name)
|
784 |
if pid > 0 and alive: |
785 |
raise errors.HypervisorError("Cannot cleanup a live instance") |
786 |
self._RemoveInstanceRuntimeFiles(pidfile, instance_name)
|
787 |
|
788 |
def RebootInstance(self, instance): |
789 |
"""Reboot an instance.
|
790 |
|
791 |
"""
|
792 |
# For some reason if we do a 'send-key ctrl-alt-delete' to the control
|
793 |
# socket the instance will stop, but now power up again. So we'll resort
|
794 |
# to shutdown and restart.
|
795 |
_, _, alive = self._InstancePidAlive(instance.name)
|
796 |
if not alive: |
797 |
raise errors.HypervisorError("Failed to reboot instance %s:" |
798 |
" not running" % instance.name)
|
799 |
# StopInstance will delete the saved KVM runtime so:
|
800 |
# ...first load it...
|
801 |
kvm_runtime = self._LoadKVMRuntime(instance)
|
802 |
# ...now we can safely call StopInstance...
|
803 |
if not self.StopInstance(instance): |
804 |
self.StopInstance(instance, force=True) |
805 |
# ...and finally we can save it again, and execute it...
|
806 |
self._SaveKVMRuntime(instance, kvm_runtime)
|
807 |
self._ExecuteKVMRuntime(instance, kvm_runtime)
|
808 |
|
809 |
def MigrationInfo(self, instance): |
810 |
"""Get instance information to perform a migration.
|
811 |
|
812 |
@type instance: L{objects.Instance}
|
813 |
@param instance: instance to be migrated
|
814 |
@rtype: string
|
815 |
@return: content of the KVM runtime file
|
816 |
|
817 |
"""
|
818 |
return self._ReadKVMRuntime(instance.name) |
819 |
|
820 |
def AcceptInstance(self, instance, info, target): |
821 |
"""Prepare to accept an instance.
|
822 |
|
823 |
@type instance: L{objects.Instance}
|
824 |
@param instance: instance to be accepted
|
825 |
@type info: string
|
826 |
@param info: content of the KVM runtime file on the source node
|
827 |
@type target: string
|
828 |
@param target: target host (usually ip), on this node
|
829 |
|
830 |
"""
|
831 |
kvm_runtime = self._LoadKVMRuntime(instance, serialized_runtime=info)
|
832 |
incoming_address = (target, instance.hvparams[constants.HV_MIGRATION_PORT]) |
833 |
self._ExecuteKVMRuntime(instance, kvm_runtime, incoming=incoming_address)
|
834 |
|
835 |
def FinalizeMigration(self, instance, info, success): |
836 |
"""Finalize an instance migration.
|
837 |
|
838 |
Stop the incoming mode KVM.
|
839 |
|
840 |
@type instance: L{objects.Instance}
|
841 |
@param instance: instance whose migration is being finalized
|
842 |
|
843 |
"""
|
844 |
if success:
|
845 |
self._WriteKVMRuntime(instance.name, info)
|
846 |
else:
|
847 |
self.StopInstance(instance, force=True) |
848 |
|
849 |
def MigrateInstance(self, instance, target, live): |
850 |
"""Migrate an instance to a target node.
|
851 |
|
852 |
The migration will not be attempted if the instance is not
|
853 |
currently running.
|
854 |
|
855 |
@type instance: L{objects.Instance}
|
856 |
@param instance: the instance to be migrated
|
857 |
@type target: string
|
858 |
@param target: ip address of the target node
|
859 |
@type live: boolean
|
860 |
@param live: perform a live migration
|
861 |
|
862 |
"""
|
863 |
instance_name = instance.name |
864 |
port = instance.hvparams[constants.HV_MIGRATION_PORT] |
865 |
pidfile, pid, alive = self._InstancePidAlive(instance_name)
|
866 |
if not alive: |
867 |
raise errors.HypervisorError("Instance not running, cannot migrate") |
868 |
|
869 |
if not utils.TcpPing(target, port, live_port_needed=True): |
870 |
raise errors.HypervisorError("Remote host %s not listening on port" |
871 |
" %s, cannot migrate" % (target, port))
|
872 |
|
873 |
if not live: |
874 |
self._CallMonitorCommand(instance_name, 'stop') |
875 |
|
876 |
migrate_command = ('migrate_set_speed %dm' %
|
877 |
instance.hvparams[constants.HV_MIGRATION_BANDWIDTH]) |
878 |
self._CallMonitorCommand(instance_name, migrate_command)
|
879 |
|
880 |
migrate_command = ('migrate_set_downtime %dms' %
|
881 |
instance.hvparams[constants.HV_MIGRATION_DOWNTIME]) |
882 |
self._CallMonitorCommand(instance_name, migrate_command)
|
883 |
|
884 |
migrate_command = 'migrate -d tcp:%s:%s' % (target, port)
|
885 |
self._CallMonitorCommand(instance_name, migrate_command)
|
886 |
|
887 |
info_command = 'info migrate'
|
888 |
done = False
|
889 |
broken_answers = 0
|
890 |
while not done: |
891 |
result = self._CallMonitorCommand(instance_name, info_command)
|
892 |
match = self._MIGRATION_STATUS_RE.search(result.stdout)
|
893 |
if not match: |
894 |
broken_answers += 1
|
895 |
if not result.stdout: |
896 |
logging.info("KVM: empty 'info migrate' result")
|
897 |
else:
|
898 |
logging.warning("KVM: unknown 'info migrate' result: %s",
|
899 |
result.stdout) |
900 |
time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
|
901 |
else:
|
902 |
status = match.group(1)
|
903 |
if status == 'completed': |
904 |
done = True
|
905 |
elif status == 'active': |
906 |
# reset the broken answers count
|
907 |
broken_answers = 0
|
908 |
time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
|
909 |
elif status == 'failed' or status == 'cancelled': |
910 |
if not live: |
911 |
self._CallMonitorCommand(instance_name, 'cont') |
912 |
raise errors.HypervisorError("Migration %s at the kvm level" % |
913 |
status) |
914 |
else:
|
915 |
logging.warning("KVM: unknown migration status '%s'", status)
|
916 |
broken_answers += 1
|
917 |
time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
|
918 |
if broken_answers >= self._MIGRATION_INFO_MAX_BAD_ANSWERS: |
919 |
raise errors.HypervisorError("Too many 'info migrate' broken answers") |
920 |
|
921 |
utils.KillProcess(pid) |
922 |
self._RemoveInstanceRuntimeFiles(pidfile, instance_name)
|
923 |
|
924 |
def GetNodeInfo(self): |
925 |
"""Return information about the node.
|
926 |
|
927 |
This is just a wrapper over the base GetLinuxNodeInfo method.
|
928 |
|
929 |
@return: a dict with the following keys (values in MiB):
|
930 |
- memory_total: the total memory size on the node
|
931 |
- memory_free: the available memory on the node for instances
|
932 |
- memory_dom0: the memory used by the node itself, if available
|
933 |
|
934 |
"""
|
935 |
return self.GetLinuxNodeInfo() |
936 |
|
937 |
@classmethod
|
938 |
def GetShellCommandForConsole(cls, instance, hvparams, beparams): |
939 |
"""Return a command for connecting to the console of an instance.
|
940 |
|
941 |
"""
|
942 |
if hvparams[constants.HV_SERIAL_CONSOLE]:
|
943 |
shell_command = ("%s STDIO,%s UNIX-CONNECT:%s" %
|
944 |
(constants.SOCAT_PATH, cls._SocatUnixConsoleParams(), |
945 |
utils.ShellQuote(cls._InstanceSerial(instance.name)))) |
946 |
else:
|
947 |
shell_command = "echo 'No serial shell for instance %s'" % instance.name
|
948 |
|
949 |
vnc_bind_address = hvparams[constants.HV_VNC_BIND_ADDRESS] |
950 |
if vnc_bind_address:
|
951 |
if instance.network_port > constants.VNC_BASE_PORT:
|
952 |
display = instance.network_port - constants.VNC_BASE_PORT |
953 |
vnc_command = ("echo 'Instance has VNC listening on %s:%d"
|
954 |
" (display: %d)'" % (vnc_bind_address,
|
955 |
instance.network_port, |
956 |
display)) |
957 |
shell_command = "%s; %s" % (vnc_command, shell_command)
|
958 |
|
959 |
return shell_command
|
960 |
|
961 |
def Verify(self): |
962 |
"""Verify the hypervisor.
|
963 |
|
964 |
Check that the binary exists.
|
965 |
|
966 |
"""
|
967 |
if not os.path.exists(constants.KVM_PATH): |
968 |
return "The kvm binary ('%s') does not exist." % constants.KVM_PATH |
969 |
if not os.path.exists(constants.SOCAT_PATH): |
970 |
return "The socat binary ('%s') does not exist." % constants.SOCAT_PATH |
971 |
|
972 |
|
973 |
@classmethod
|
974 |
def CheckParameterSyntax(cls, hvparams): |
975 |
"""Check the given parameters for validity.
|
976 |
|
977 |
@type hvparams: dict
|
978 |
@param hvparams: dictionary with parameter names/value
|
979 |
@raise errors.HypervisorError: when a parameter is not valid
|
980 |
|
981 |
"""
|
982 |
super(KVMHypervisor, cls).CheckParameterSyntax(hvparams)
|
983 |
|
984 |
kernel_path = hvparams[constants.HV_KERNEL_PATH] |
985 |
if kernel_path:
|
986 |
if not hvparams[constants.HV_ROOT_PATH]: |
987 |
raise errors.HypervisorError("Need a root partition for the instance," |
988 |
" if a kernel is defined")
|
989 |
|
990 |
if (hvparams[constants.HV_VNC_X509_VERIFY] and |
991 |
not hvparams[constants.HV_VNC_X509]):
|
992 |
raise errors.HypervisorError("%s must be defined, if %s is" % |
993 |
(constants.HV_VNC_X509, |
994 |
constants.HV_VNC_X509_VERIFY)) |
995 |
|
996 |
boot_order = hvparams[constants.HV_BOOT_ORDER] |
997 |
if (boot_order == constants.HT_BO_CDROM and |
998 |
not hvparams[constants.HV_CDROM_IMAGE_PATH]):
|
999 |
raise errors.HypervisorError("Cannot boot from cdrom without an" |
1000 |
" ISO path")
|
1001 |
|
1002 |
security_model = hvparams[constants.HV_SECURITY_MODEL] |
1003 |
if security_model == constants.HT_SM_USER:
|
1004 |
if not hvparams[constants.HV_SECURITY_DOMAIN]: |
1005 |
raise errors.HypervisorError("A security domain (user to run kvm as)" |
1006 |
" must be specified")
|
1007 |
elif (security_model == constants.HT_SM_NONE or |
1008 |
security_model == constants.HT_SM_POOL): |
1009 |
if hvparams[constants.HV_SECURITY_DOMAIN]:
|
1010 |
raise errors.HypervisorError("Cannot have a security domain when the" |
1011 |
" security model is 'none' or 'pool'")
|
1012 |
|
1013 |
@classmethod
|
1014 |
def ValidateParameters(cls, hvparams): |
1015 |
"""Check the given parameters for validity.
|
1016 |
|
1017 |
@type hvparams: dict
|
1018 |
@param hvparams: dictionary with parameter names/value
|
1019 |
@raise errors.HypervisorError: when a parameter is not valid
|
1020 |
|
1021 |
"""
|
1022 |
super(KVMHypervisor, cls).ValidateParameters(hvparams)
|
1023 |
|
1024 |
security_model = hvparams[constants.HV_SECURITY_MODEL] |
1025 |
if security_model == constants.HT_SM_USER:
|
1026 |
username = hvparams[constants.HV_SECURITY_DOMAIN] |
1027 |
try:
|
1028 |
pwd.getpwnam(username) |
1029 |
except KeyError: |
1030 |
raise errors.HypervisorError("Unknown security domain user %s" |
1031 |
% username) |
1032 |
|
1033 |
@classmethod
|
1034 |
def PowercycleNode(cls): |
1035 |
"""KVM powercycle, just a wrapper over Linux powercycle.
|
1036 |
|
1037 |
"""
|
1038 |
cls.LinuxPowercycle() |