root / lib / hypervisor / hv_kvm.py @ 7548396c
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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 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.hypervisor import hv_base |
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class KVMHypervisor(hv_base.BaseHypervisor): |
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"""KVM hypervisor interface"""
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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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_DIRS = [_ROOT_DIR, _PIDS_DIR, _UIDS_DIR, _CTRL_DIR, _CONF_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_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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} |
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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 _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.ReadFile(uid_file))
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except EnvironmentError: |
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logging.warning("Can't read uid file", exc_info=True) |
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return None |
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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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return uid
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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.
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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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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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# 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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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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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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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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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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if boot_network:
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kvm_cmd.extend(['-boot', 'n']) |
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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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else:
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if_val = ',if=%s' % disk_type
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# Cache mode
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disk_cache = hvp[constants.HV_DISK_CACHE] |
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if disk_cache != constants.HT_CACHE_DEFAULT:
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cache_val = ",cache=%s" % disk_cache
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else:
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cache_val = ""
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for cfdev, dev_path in block_devices: |
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if cfdev.mode != constants.DISK_RDWR:
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raise errors.HypervisorError("Instance has read-only disks which" |
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" are not supported by KVM")
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# TODO: handle FD_LOOP and FD_BLKTAP (?)
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if boot_disk:
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kvm_cmd.extend(['-boot', 'c']) |
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boot_val = ',boot=on'
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# We only boot from the first disk
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boot_disk = False
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else:
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boot_val = ''
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drive_val = 'file=%s,format=raw%s%s%s' % (dev_path, if_val, boot_val,
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cache_val) |
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kvm_cmd.extend(['-drive', drive_val])
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iso_image = hvp[constants.HV_CDROM_IMAGE_PATH] |
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if iso_image:
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options = ',format=raw,media=cdrom'
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if boot_cdrom:
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kvm_cmd.extend(['-boot', 'd']) |
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options = '%s,boot=on' % options
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else:
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options = '%s,if=virtio' % options
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drive_val = 'file=%s%s' % (iso_image, options)
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kvm_cmd.extend(['-drive', drive_val])
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|
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kernel_path = hvp[constants.HV_KERNEL_PATH] |
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if kernel_path:
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kvm_cmd.extend(['-kernel', kernel_path])
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initrd_path = hvp[constants.HV_INITRD_PATH] |
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if initrd_path:
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kvm_cmd.extend(['-initrd', initrd_path])
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root_append = ['root=%s' % hvp[constants.HV_ROOT_PATH],
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hvp[constants.HV_KERNEL_ARGS]] |
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if hvp[constants.HV_SERIAL_CONSOLE]:
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root_append.append('console=ttyS0,38400')
|
457 |
kvm_cmd.extend(['-append', ' '.join(root_append)]) |
458 |
|
459 |
mouse_type = hvp[constants.HV_USB_MOUSE] |
460 |
if mouse_type:
|
461 |
kvm_cmd.extend(['-usb'])
|
462 |
kvm_cmd.extend(['-usbdevice', mouse_type])
|
463 |
|
464 |
vnc_bind_address = hvp[constants.HV_VNC_BIND_ADDRESS] |
465 |
if vnc_bind_address:
|
466 |
if utils.IsValidIP(vnc_bind_address):
|
467 |
if instance.network_port > constants.VNC_BASE_PORT:
|
468 |
display = instance.network_port - constants.VNC_BASE_PORT |
469 |
if vnc_bind_address == '0.0.0.0': |
470 |
vnc_arg = ':%d' % (display)
|
471 |
else:
|
472 |
vnc_arg = '%s:%d' % (vnc_bind_address, display)
|
473 |
else:
|
474 |
logging.error("Network port is not a valid VNC display (%d < %d)."
|
475 |
" Not starting VNC", instance.network_port,
|
476 |
constants.VNC_BASE_PORT) |
477 |
vnc_arg = 'none'
|
478 |
|
479 |
# Only allow tls and other option when not binding to a file, for now.
|
480 |
# kvm/qemu gets confused otherwise about the filename to use.
|
481 |
vnc_append = ''
|
482 |
if hvp[constants.HV_VNC_TLS]:
|
483 |
vnc_append = '%s,tls' % vnc_append
|
484 |
if hvp[constants.HV_VNC_X509_VERIFY]:
|
485 |
vnc_append = '%s,x509verify=%s' % (vnc_append,
|
486 |
hvp[constants.HV_VNC_X509]) |
487 |
elif hvp[constants.HV_VNC_X509]:
|
488 |
vnc_append = '%s,x509=%s' % (vnc_append,
|
489 |
hvp[constants.HV_VNC_X509]) |
490 |
if hvp[constants.HV_VNC_PASSWORD_FILE]:
|
491 |
vnc_append = '%s,password' % vnc_append
|
492 |
|
493 |
vnc_arg = '%s%s' % (vnc_arg, vnc_append)
|
494 |
|
495 |
else:
|
496 |
vnc_arg = 'unix:%s/%s.vnc' % (vnc_bind_address, instance.name)
|
497 |
|
498 |
kvm_cmd.extend(['-vnc', vnc_arg])
|
499 |
else:
|
500 |
kvm_cmd.extend(['-nographic'])
|
501 |
|
502 |
monitor_dev = ("unix:%s,server,nowait" %
|
503 |
self._InstanceMonitor(instance.name))
|
504 |
kvm_cmd.extend(['-monitor', monitor_dev])
|
505 |
if hvp[constants.HV_SERIAL_CONSOLE]:
|
506 |
serial_dev = ('unix:%s,server,nowait' %
|
507 |
self._InstanceSerial(instance.name))
|
508 |
kvm_cmd.extend(['-serial', serial_dev])
|
509 |
else:
|
510 |
kvm_cmd.extend(['-serial', 'none']) |
511 |
|
512 |
if hvp[constants.HV_USE_LOCALTIME]:
|
513 |
kvm_cmd.extend(['-localtime'])
|
514 |
|
515 |
# Save the current instance nics, but defer their expansion as parameters,
|
516 |
# as we'll need to generate executable temp files for them.
|
517 |
kvm_nics = instance.nics |
518 |
hvparams = hvp |
519 |
|
520 |
return (kvm_cmd, kvm_nics, hvparams)
|
521 |
|
522 |
def _WriteKVMRuntime(self, instance_name, data): |
523 |
"""Write an instance's KVM runtime
|
524 |
|
525 |
"""
|
526 |
try:
|
527 |
utils.WriteFile(self._InstanceKVMRuntime(instance_name),
|
528 |
data=data) |
529 |
except EnvironmentError, err: |
530 |
raise errors.HypervisorError("Failed to save KVM runtime file: %s" % err) |
531 |
|
532 |
def _ReadKVMRuntime(self, instance_name): |
533 |
"""Read an instance's KVM runtime
|
534 |
|
535 |
"""
|
536 |
try:
|
537 |
file_content = utils.ReadFile(self._InstanceKVMRuntime(instance_name))
|
538 |
except EnvironmentError, err: |
539 |
raise errors.HypervisorError("Failed to load KVM runtime file: %s" % err) |
540 |
return file_content
|
541 |
|
542 |
def _SaveKVMRuntime(self, instance, kvm_runtime): |
543 |
"""Save an instance's KVM runtime
|
544 |
|
545 |
"""
|
546 |
kvm_cmd, kvm_nics, hvparams = kvm_runtime |
547 |
serialized_nics = [nic.ToDict() for nic in kvm_nics] |
548 |
serialized_form = serializer.Dump((kvm_cmd, serialized_nics, hvparams)) |
549 |
self._WriteKVMRuntime(instance.name, serialized_form)
|
550 |
|
551 |
def _LoadKVMRuntime(self, instance, serialized_runtime=None): |
552 |
"""Load an instance's KVM runtime
|
553 |
|
554 |
"""
|
555 |
if not serialized_runtime: |
556 |
serialized_runtime = self._ReadKVMRuntime(instance.name)
|
557 |
loaded_runtime = serializer.Load(serialized_runtime) |
558 |
kvm_cmd, serialized_nics, hvparams = loaded_runtime |
559 |
kvm_nics = [objects.NIC.FromDict(snic) for snic in serialized_nics] |
560 |
return (kvm_cmd, kvm_nics, hvparams)
|
561 |
|
562 |
def _ExecuteKVMRuntime(self, instance, kvm_runtime, incoming=None): |
563 |
"""Execute a KVM cmd, after completing it with some last minute data
|
564 |
|
565 |
@type incoming: tuple of strings
|
566 |
@param incoming: (target_host_ip, port)
|
567 |
|
568 |
"""
|
569 |
hvp = instance.hvparams |
570 |
name = instance.name |
571 |
self._CheckDown(name)
|
572 |
|
573 |
temp_files = [] |
574 |
|
575 |
kvm_cmd, kvm_nics, hvparams = kvm_runtime |
576 |
|
577 |
security_model = hvp[constants.HV_SECURITY_MODEL] |
578 |
if security_model == constants.HT_SM_USER:
|
579 |
kvm_cmd.extend(["-runas", hvp[constants.HV_SECURITY_DOMAIN]])
|
580 |
|
581 |
if not kvm_nics: |
582 |
kvm_cmd.extend(['-net', 'none']) |
583 |
else:
|
584 |
nic_type = hvparams[constants.HV_NIC_TYPE] |
585 |
if nic_type == constants.HT_NIC_PARAVIRTUAL:
|
586 |
nic_model = "model=virtio"
|
587 |
else:
|
588 |
nic_model = "model=%s" % nic_type
|
589 |
|
590 |
for nic_seq, nic in enumerate(kvm_nics): |
591 |
nic_val = "nic,vlan=%s,macaddr=%s,%s" % (nic_seq, nic.mac, nic_model)
|
592 |
script = self._WriteNetScript(instance, nic_seq, nic)
|
593 |
kvm_cmd.extend(['-net', nic_val])
|
594 |
kvm_cmd.extend(['-net', 'tap,vlan=%s,script=%s' % (nic_seq, script)]) |
595 |
temp_files.append(script) |
596 |
|
597 |
if incoming:
|
598 |
target, port = incoming |
599 |
kvm_cmd.extend(['-incoming', 'tcp:%s:%s' % (target, port)]) |
600 |
|
601 |
vnc_pwd_file = hvp[constants.HV_VNC_PASSWORD_FILE] |
602 |
vnc_pwd = None
|
603 |
if vnc_pwd_file:
|
604 |
try:
|
605 |
vnc_pwd = utils.ReadFile(vnc_pwd_file) |
606 |
except EnvironmentError, err: |
607 |
raise errors.HypervisorError("Failed to open VNC password file %s: %s" |
608 |
% (vnc_pwd_file, err)) |
609 |
|
610 |
result = utils.RunCmd(kvm_cmd) |
611 |
if result.failed:
|
612 |
raise errors.HypervisorError("Failed to start instance %s: %s (%s)" % |
613 |
(name, result.fail_reason, result.output)) |
614 |
|
615 |
if not self._InstancePidAlive(name)[2]: |
616 |
raise errors.HypervisorError("Failed to start instance %s" % name) |
617 |
|
618 |
if vnc_pwd:
|
619 |
change_cmd = 'change vnc password %s' % vnc_pwd
|
620 |
self._CallMonitorCommand(instance.name, change_cmd)
|
621 |
|
622 |
for filename in temp_files: |
623 |
utils.RemoveFile(filename) |
624 |
|
625 |
def StartInstance(self, instance, block_devices): |
626 |
"""Start an instance.
|
627 |
|
628 |
"""
|
629 |
self._CheckDown(instance.name)
|
630 |
kvm_runtime = self._GenerateKVMRuntime(instance, block_devices)
|
631 |
self._SaveKVMRuntime(instance, kvm_runtime)
|
632 |
self._ExecuteKVMRuntime(instance, kvm_runtime)
|
633 |
|
634 |
def _CallMonitorCommand(self, instance_name, command): |
635 |
"""Invoke a command on the instance monitor.
|
636 |
|
637 |
"""
|
638 |
socat = ("echo %s | %s STDIO UNIX-CONNECT:%s" %
|
639 |
(utils.ShellQuote(command), |
640 |
constants.SOCAT_PATH, |
641 |
utils.ShellQuote(self._InstanceMonitor(instance_name))))
|
642 |
result = utils.RunCmd(socat) |
643 |
if result.failed:
|
644 |
msg = ("Failed to send command '%s' to instance %s."
|
645 |
" output: %s, error: %s, fail_reason: %s" %
|
646 |
(command, instance_name, |
647 |
result.stdout, result.stderr, result.fail_reason)) |
648 |
raise errors.HypervisorError(msg)
|
649 |
|
650 |
return result
|
651 |
|
652 |
def StopInstance(self, instance, force=False, retry=False, name=None): |
653 |
"""Stop an instance.
|
654 |
|
655 |
"""
|
656 |
if name is not None and not force: |
657 |
raise errors.HypervisorError("Cannot shutdown cleanly by name only") |
658 |
if name is None: |
659 |
name = instance.name |
660 |
acpi = instance.hvparams[constants.HV_ACPI] |
661 |
else:
|
662 |
acpi = False
|
663 |
_, pid, alive = self._InstancePidAlive(name)
|
664 |
if pid > 0 and alive: |
665 |
if force or not acpi: |
666 |
utils.KillProcess(pid) |
667 |
else:
|
668 |
self._CallMonitorCommand(name, 'system_powerdown') |
669 |
|
670 |
def CleanupInstance(self, instance_name): |
671 |
"""Cleanup after a stopped instance
|
672 |
|
673 |
"""
|
674 |
pidfile, pid, alive = self._InstancePidAlive(instance_name)
|
675 |
if pid > 0 and alive: |
676 |
raise errors.HypervisorError("Cannot cleanup a live instance") |
677 |
self._RemoveInstanceRuntimeFiles(pidfile, instance_name)
|
678 |
|
679 |
def RebootInstance(self, instance): |
680 |
"""Reboot an instance.
|
681 |
|
682 |
"""
|
683 |
# For some reason if we do a 'send-key ctrl-alt-delete' to the control
|
684 |
# socket the instance will stop, but now power up again. So we'll resort
|
685 |
# to shutdown and restart.
|
686 |
_, _, alive = self._InstancePidAlive(instance.name)
|
687 |
if not alive: |
688 |
raise errors.HypervisorError("Failed to reboot instance %s:" |
689 |
" not running" % instance.name)
|
690 |
# StopInstance will delete the saved KVM runtime so:
|
691 |
# ...first load it...
|
692 |
kvm_runtime = self._LoadKVMRuntime(instance)
|
693 |
# ...now we can safely call StopInstance...
|
694 |
if not self.StopInstance(instance): |
695 |
self.StopInstance(instance, force=True) |
696 |
# ...and finally we can save it again, and execute it...
|
697 |
self._SaveKVMRuntime(instance, kvm_runtime)
|
698 |
self._ExecuteKVMRuntime(instance, kvm_runtime)
|
699 |
|
700 |
def MigrationInfo(self, instance): |
701 |
"""Get instance information to perform a migration.
|
702 |
|
703 |
@type instance: L{objects.Instance}
|
704 |
@param instance: instance to be migrated
|
705 |
@rtype: string
|
706 |
@return: content of the KVM runtime file
|
707 |
|
708 |
"""
|
709 |
return self._ReadKVMRuntime(instance.name) |
710 |
|
711 |
def AcceptInstance(self, instance, info, target): |
712 |
"""Prepare to accept an instance.
|
713 |
|
714 |
@type instance: L{objects.Instance}
|
715 |
@param instance: instance to be accepted
|
716 |
@type info: string
|
717 |
@param info: content of the KVM runtime file on the source node
|
718 |
@type target: string
|
719 |
@param target: target host (usually ip), on this node
|
720 |
|
721 |
"""
|
722 |
kvm_runtime = self._LoadKVMRuntime(instance, serialized_runtime=info)
|
723 |
incoming_address = (target, instance.hvparams[constants.HV_MIGRATION_PORT]) |
724 |
self._ExecuteKVMRuntime(instance, kvm_runtime, incoming=incoming_address)
|
725 |
|
726 |
def FinalizeMigration(self, instance, info, success): |
727 |
"""Finalize an instance migration.
|
728 |
|
729 |
Stop the incoming mode KVM.
|
730 |
|
731 |
@type instance: L{objects.Instance}
|
732 |
@param instance: instance whose migration is being aborted
|
733 |
|
734 |
"""
|
735 |
if success:
|
736 |
self._WriteKVMRuntime(instance.name, info)
|
737 |
else:
|
738 |
self.StopInstance(instance, force=True) |
739 |
|
740 |
def MigrateInstance(self, instance, target, live): |
741 |
"""Migrate an instance to a target node.
|
742 |
|
743 |
The migration will not be attempted if the instance is not
|
744 |
currently running.
|
745 |
|
746 |
@type instance: L{objects.Instance}
|
747 |
@param instance: the instance to be migrated
|
748 |
@type target: string
|
749 |
@param target: ip address of the target node
|
750 |
@type live: boolean
|
751 |
@param live: perform a live migration
|
752 |
|
753 |
"""
|
754 |
instance_name = instance.name |
755 |
port = instance.hvparams[constants.HV_MIGRATION_PORT] |
756 |
pidfile, pid, alive = self._InstancePidAlive(instance_name)
|
757 |
if not alive: |
758 |
raise errors.HypervisorError("Instance not running, cannot migrate") |
759 |
|
760 |
if not utils.TcpPing(target, port, live_port_needed=True): |
761 |
raise errors.HypervisorError("Remote host %s not listening on port" |
762 |
" %s, cannot migrate" % (target, port))
|
763 |
|
764 |
if not live: |
765 |
self._CallMonitorCommand(instance_name, 'stop') |
766 |
|
767 |
migrate_command = 'migrate -d tcp:%s:%s' % (target, port)
|
768 |
self._CallMonitorCommand(instance_name, migrate_command)
|
769 |
|
770 |
info_command = 'info migrate'
|
771 |
done = False
|
772 |
broken_answers = 0
|
773 |
while not done: |
774 |
result = self._CallMonitorCommand(instance_name, info_command)
|
775 |
match = self._MIGRATION_STATUS_RE.search(result.stdout)
|
776 |
if not match: |
777 |
broken_answers += 1
|
778 |
if not result.stdout: |
779 |
logging.info("KVM: empty 'info migrate' result")
|
780 |
else:
|
781 |
logging.warning("KVM: unknown 'info migrate' result: %s",
|
782 |
result.stdout) |
783 |
time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
|
784 |
else:
|
785 |
status = match.group(1)
|
786 |
if status == 'completed': |
787 |
done = True
|
788 |
elif status == 'active': |
789 |
# reset the broken answers count
|
790 |
broken_answers = 0
|
791 |
time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
|
792 |
elif status == 'failed' or status == 'cancelled': |
793 |
if not live: |
794 |
self._CallMonitorCommand(instance_name, 'cont') |
795 |
raise errors.HypervisorError("Migration %s at the kvm level" % |
796 |
status) |
797 |
else:
|
798 |
logging.warning("KVM: unknown migration status '%s'", status)
|
799 |
broken_answers += 1
|
800 |
time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
|
801 |
if broken_answers >= self._MIGRATION_INFO_MAX_BAD_ANSWERS: |
802 |
raise errors.HypervisorError("Too many 'info migrate' broken answers") |
803 |
|
804 |
utils.KillProcess(pid) |
805 |
self._RemoveInstanceRuntimeFiles(pidfile, instance_name)
|
806 |
|
807 |
def GetNodeInfo(self): |
808 |
"""Return information about the node.
|
809 |
|
810 |
This is just a wrapper over the base GetLinuxNodeInfo method.
|
811 |
|
812 |
@return: a dict with the following keys (values in MiB):
|
813 |
- memory_total: the total memory size on the node
|
814 |
- memory_free: the available memory on the node for instances
|
815 |
- memory_dom0: the memory used by the node itself, if available
|
816 |
|
817 |
"""
|
818 |
return self.GetLinuxNodeInfo() |
819 |
|
820 |
@classmethod
|
821 |
def GetShellCommandForConsole(cls, instance, hvparams, beparams): |
822 |
"""Return a command for connecting to the console of an instance.
|
823 |
|
824 |
"""
|
825 |
if hvparams[constants.HV_SERIAL_CONSOLE]:
|
826 |
shell_command = ("%s STDIO,%s UNIX-CONNECT:%s" %
|
827 |
(constants.SOCAT_PATH, cls._SocatUnixConsoleParams(), |
828 |
utils.ShellQuote(cls._InstanceSerial(instance.name)))) |
829 |
else:
|
830 |
shell_command = "echo 'No serial shell for instance %s'" % instance.name
|
831 |
|
832 |
vnc_bind_address = hvparams[constants.HV_VNC_BIND_ADDRESS] |
833 |
if vnc_bind_address:
|
834 |
if instance.network_port > constants.VNC_BASE_PORT:
|
835 |
display = instance.network_port - constants.VNC_BASE_PORT |
836 |
vnc_command = ("echo 'Instance has VNC listening on %s:%d"
|
837 |
" (display: %d)'" % (vnc_bind_address,
|
838 |
instance.network_port, |
839 |
display)) |
840 |
shell_command = "%s; %s" % (vnc_command, shell_command)
|
841 |
|
842 |
return shell_command
|
843 |
|
844 |
def Verify(self): |
845 |
"""Verify the hypervisor.
|
846 |
|
847 |
Check that the binary exists.
|
848 |
|
849 |
"""
|
850 |
if not os.path.exists(constants.KVM_PATH): |
851 |
return "The kvm binary ('%s') does not exist." % constants.KVM_PATH |
852 |
if not os.path.exists(constants.SOCAT_PATH): |
853 |
return "The socat binary ('%s') does not exist." % constants.SOCAT_PATH |
854 |
|
855 |
|
856 |
@classmethod
|
857 |
def CheckParameterSyntax(cls, hvparams): |
858 |
"""Check the given parameters for validity.
|
859 |
|
860 |
@type hvparams: dict
|
861 |
@param hvparams: dictionary with parameter names/value
|
862 |
@raise errors.HypervisorError: when a parameter is not valid
|
863 |
|
864 |
"""
|
865 |
super(KVMHypervisor, cls).CheckParameterSyntax(hvparams)
|
866 |
|
867 |
kernel_path = hvparams[constants.HV_KERNEL_PATH] |
868 |
if kernel_path:
|
869 |
if not hvparams[constants.HV_ROOT_PATH]: |
870 |
raise errors.HypervisorError("Need a root partition for the instance," |
871 |
" if a kernel is defined")
|
872 |
|
873 |
if (hvparams[constants.HV_VNC_X509_VERIFY] and |
874 |
not hvparams[constants.HV_VNC_X509]):
|
875 |
raise errors.HypervisorError("%s must be defined, if %s is" % |
876 |
(constants.HV_VNC_X509, |
877 |
constants.HV_VNC_X509_VERIFY)) |
878 |
|
879 |
boot_order = hvparams[constants.HV_BOOT_ORDER] |
880 |
if (boot_order == constants.HT_BO_CDROM and |
881 |
not hvparams[constants.HV_CDROM_IMAGE_PATH]):
|
882 |
raise errors.HypervisorError("Cannot boot from cdrom without an" |
883 |
" ISO path")
|
884 |
|
885 |
security_model = hvparams[constants.HV_SECURITY_MODEL] |
886 |
if security_model == constants.HT_SM_USER:
|
887 |
if not hvparams[constants.HV_SECURITY_DOMAIN]: |
888 |
raise errors.HypervisorError("A security domain (user to run kvm as)" |
889 |
" must be specified")
|
890 |
elif (security_model == constants.HT_SM_NONE or |
891 |
security_model == constants.HT_SM_POOL): |
892 |
if hvparams[constants.HV_SECURITY_DOMAIN]:
|
893 |
raise errors.HypervisorError("Cannot have a security domain when the" |
894 |
" security model is 'none' or 'pool'")
|
895 |
if security_model == constants.HT_SM_POOL:
|
896 |
raise errors.HypervisorError("Security model pool is not supported yet") |
897 |
|
898 |
@classmethod
|
899 |
def ValidateParameters(cls, hvparams): |
900 |
"""Check the given parameters for validity.
|
901 |
|
902 |
@type hvparams: dict
|
903 |
@param hvparams: dictionary with parameter names/value
|
904 |
@raise errors.HypervisorError: when a parameter is not valid
|
905 |
|
906 |
"""
|
907 |
super(KVMHypervisor, cls).ValidateParameters(hvparams)
|
908 |
|
909 |
security_model = hvparams[constants.HV_SECURITY_MODEL] |
910 |
if security_model == constants.HT_SM_USER:
|
911 |
username = hvparams[constants.HV_SECURITY_DOMAIN] |
912 |
try:
|
913 |
pwd.getpwnam(username) |
914 |
except KeyError: |
915 |
raise errors.HypervisorError("Unknown security domain user %s" |
916 |
% username) |
917 |
|
918 |
@classmethod
|
919 |
def PowercycleNode(cls): |
920 |
"""KVM powercycle, just a wrapper over Linux powercycle.
|
921 |
|
922 |
"""
|
923 |
cls.LinuxPowercycle() |