4 # Copyright (C) 2008, 2009, 2010, 2011 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
41 import affinity # pylint: disable=F0401
45 from ganeti import utils
46 from ganeti import constants
47 from ganeti import errors
48 from ganeti import serializer
49 from ganeti import objects
50 from ganeti import uidpool
51 from ganeti import ssconf
52 from ganeti.hypervisor import hv_base
53 from ganeti import netutils
54 from ganeti.utils import wrapper as utils_wrapper
57 _KVM_NETWORK_SCRIPT = constants.SYSCONFDIR + "/ganeti/kvm-vif-bridge"
58 _KVM_START_PAUSED_FLAG = "-S"
60 # TUN/TAP driver constants, taken from <linux/if_tun.h>
61 # They are architecture-independent and already hardcoded in qemu-kvm source,
62 # so we can safely include them here.
63 TUNSETIFF = 0x400454ca
64 TUNGETIFF = 0x800454d2
65 TUNGETFEATURES = 0x800454cf
71 def _ProbeTapVnetHdr(fd):
72 """Check whether to enable the IFF_VNET_HDR flag.
74 To do this, _all_ of the following conditions must be met:
75 1. TUNGETFEATURES ioctl() *must* be implemented
76 2. TUNGETFEATURES ioctl() result *must* contain the IFF_VNET_HDR flag
77 3. TUNGETIFF ioctl() *must* be implemented; reading the kernel code in
78 drivers/net/tun.c there is no way to test this until after the tap device
79 has been created using TUNSETIFF, and there is no way to change the
80 IFF_VNET_HDR flag after creating the interface, catch-22! However both
81 TUNGETIFF and TUNGETFEATURES were introduced in kernel version 2.6.27,
82 thus we can expect TUNGETIFF to be present if TUNGETFEATURES is.
85 @param fd: the file descriptor of /dev/net/tun
88 req = struct.pack("I", 0)
90 res = fcntl.ioctl(fd, TUNGETFEATURES, req)
91 except EnvironmentError:
92 logging.warning("TUNGETFEATURES ioctl() not implemented")
95 tunflags = struct.unpack("I", res)[0]
96 if tunflags & IFF_VNET_HDR:
99 logging.warning("Host does not support IFF_VNET_HDR, not enabling")
103 def _OpenTap(vnet_hdr=True):
104 """Open a new tap device and return its file descriptor.
106 This is intended to be used by a qemu-type hypervisor together with the -net
107 tap,fd=<fd> command line parameter.
109 @type vnet_hdr: boolean
110 @param vnet_hdr: Enable the VNET Header
111 @return: (ifname, tapfd)
116 tapfd = os.open("/dev/net/tun", os.O_RDWR)
117 except EnvironmentError:
118 raise errors.HypervisorError("Failed to open /dev/net/tun")
120 flags = IFF_TAP | IFF_NO_PI
122 if vnet_hdr and _ProbeTapVnetHdr(tapfd):
123 flags |= IFF_VNET_HDR
125 # The struct ifreq ioctl request (see netdevice(7))
126 ifr = struct.pack("16sh", "", flags)
129 res = fcntl.ioctl(tapfd, TUNSETIFF, ifr)
130 except EnvironmentError:
131 raise errors.HypervisorError("Failed to allocate a new TAP device")
133 # Get the interface name from the ioctl
134 ifname = struct.unpack("16sh", res)[0].strip("\x00")
135 return (ifname, tapfd)
139 """QEMU Messaging Protocol (QMP) message.
142 def __init__(self, data):
143 """Creates a new QMP message based on the passed data.
146 if not isinstance(data, dict):
147 raise TypeError("QmpMessage must be initialized with a dict")
151 def __getitem__(self, field_name):
152 """Get the value of the required field if present, or None.
154 Overrides the [] operator to provide access to the message data,
155 returning None if the required item is not in the message
156 @return: the value of the field_name field, or None if field_name
157 is not contained in the message
160 return self.data.get(field_name, None)
162 def __setitem__(self, field_name, field_value):
163 """Set the value of the required field_name to field_value.
166 self.data[field_name] = field_value
169 def BuildFromJsonString(json_string):
170 """Build a QmpMessage from a JSON encoded string.
172 @type json_string: str
173 @param json_string: JSON string representing the message
174 @rtype: L{QmpMessage}
175 @return: a L{QmpMessage} built from json_string
179 data = serializer.LoadJson(json_string)
180 return QmpMessage(data)
183 # The protocol expects the JSON object to be sent as a single line.
184 return serializer.DumpJson(self.data)
186 def __eq__(self, other):
187 # When comparing two QmpMessages, we are interested in comparing
188 # their internal representation of the message data
189 return self.data == other.data
193 """Connection to the QEMU Monitor using the QEMU Monitor Protocol (QMP).
196 _FIRST_MESSAGE_KEY = "QMP"
199 _RETURN_KEY = RETURN_KEY = "return"
200 _ACTUAL_KEY = ACTUAL_KEY = "actual"
201 _ERROR_CLASS_KEY = "class"
202 _ERROR_DATA_KEY = "data"
203 _ERROR_DESC_KEY = "desc"
204 _EXECUTE_KEY = "execute"
205 _ARGUMENTS_KEY = "arguments"
206 _CAPABILITIES_COMMAND = "qmp_capabilities"
207 _MESSAGE_END_TOKEN = "\r\n"
210 def __init__(self, monitor_filename):
211 """Instantiates the QmpConnection object.
213 @type monitor_filename: string
214 @param monitor_filename: the filename of the UNIX raw socket on which the
215 QMP monitor is listening
218 self.monitor_filename = monitor_filename
219 self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
220 # We want to fail if the server doesn't send a complete message
221 # in a reasonable amount of time
222 self.sock.settimeout(self._SOCKET_TIMEOUT)
223 self._connected = False
226 def _check_socket(self):
229 sock_stat = os.stat(self.monitor_filename)
230 except EnvironmentError, err:
231 if err.errno == errno.ENOENT:
232 raise errors.HypervisorError("No qmp socket found")
234 raise errors.HypervisorError("Error checking qmp socket: %s",
235 utils.ErrnoOrStr(err))
236 if not stat.S_ISSOCK(sock_stat.st_mode):
237 raise errors.HypervisorError("Qmp socket is not a socket")
239 def _check_connection(self):
240 """Make sure that the connection is established.
243 if not self._connected:
244 raise errors.ProgrammerError("To use a QmpConnection you need to first"
245 " invoke connect() on it")
248 """Connects to the QMP monitor.
250 Connects to the UNIX socket and makes sure that we can actually send and
251 receive data to the kvm instance via QMP.
253 @raise errors.HypervisorError: when there are communication errors
254 @raise errors.ProgrammerError: when there are data serialization errors
258 raise errors.ProgrammerError("Cannot connect twice")
262 # Check file existance/stuff
264 self.sock.connect(self.monitor_filename)
265 except EnvironmentError:
266 raise errors.HypervisorError("Can't connect to qmp socket")
267 self._connected = True
269 # Check if we receive a correct greeting message from the server
270 # (As per the QEMU Protocol Specification 0.1 - section 2.2)
271 greeting = self._Recv()
272 if not greeting[self._FIRST_MESSAGE_KEY]:
273 self._connected = False
274 raise errors.HypervisorError("kvm: qmp communication error (wrong"
277 # Let's put the monitor in command mode using the qmp_capabilities
278 # command, or else no command will be executable.
279 # (As per the QEMU Protocol Specification 0.1 - section 4)
280 self.Execute(self._CAPABILITIES_COMMAND)
282 def _ParseMessage(self, buf):
283 """Extract and parse a QMP message from the given buffer.
285 Seeks for a QMP message in the given buf. If found, it parses it and
286 returns it together with the rest of the characters in the buf.
287 If no message is found, returns None and the whole buffer.
289 @raise errors.ProgrammerError: when there are data serialization errors
293 # Check if we got the message end token (CRLF, as per the QEMU Protocol
294 # Specification 0.1 - Section 2.1.1)
295 pos = buf.find(self._MESSAGE_END_TOKEN)
298 message = QmpMessage.BuildFromJsonString(buf[:pos + 1])
299 except Exception, err:
300 raise errors.ProgrammerError("QMP data serialization error: %s" % err)
303 return (message, buf)
306 """Receives a message from QMP and decodes the received JSON object.
309 @return: the received message
310 @raise errors.HypervisorError: when there are communication errors
311 @raise errors.ProgrammerError: when there are data serialization errors
314 self._check_connection()
316 # Check if there is already a message in the buffer
317 (message, self._buf) = self._ParseMessage(self._buf)
321 recv_buffer = StringIO.StringIO(self._buf)
322 recv_buffer.seek(len(self._buf))
325 data = self.sock.recv(4096)
328 recv_buffer.write(data)
330 (message, self._buf) = self._ParseMessage(recv_buffer.getvalue())
334 except socket.timeout, err:
335 raise errors.HypervisorError("Timeout while receiving a QMP message: "
337 except socket.error, err:
338 raise errors.HypervisorError("Unable to receive data from KVM using the"
339 " QMP protocol: %s" % err)
341 def _Send(self, message):
342 """Encodes and sends a message to KVM using QMP.
344 @type message: QmpMessage
345 @param message: message to send to KVM
346 @raise errors.HypervisorError: when there are communication errors
347 @raise errors.ProgrammerError: when there are data serialization errors
350 self._check_connection()
352 message_str = str(message)
353 except Exception, err:
354 raise errors.ProgrammerError("QMP data deserialization error: %s" % err)
357 self.sock.sendall(message_str)
358 except socket.timeout, err:
359 raise errors.HypervisorError("Timeout while sending a QMP message: "
360 "%s (%s)" % (err.string, err.errno))
361 except socket.error, err:
362 raise errors.HypervisorError("Unable to send data from KVM using the"
363 " QMP protocol: %s" % err)
365 def Execute(self, command, arguments=None):
366 """Executes a QMP command and returns the response of the server.
369 @param command: the command to execute
370 @type arguments: dict
371 @param arguments: dictionary of arguments to be passed to the command
373 @return: dictionary representing the received JSON object
374 @raise errors.HypervisorError: when there are communication errors
375 @raise errors.ProgrammerError: when there are data serialization errors
378 self._check_connection()
379 message = QmpMessage({self._EXECUTE_KEY: command})
381 message[self._ARGUMENTS_KEY] = arguments
384 # Events can occur between the sending of the command and the reception
385 # of the response, so we need to filter out messages with the event key.
387 response = self._Recv()
388 err = response[self._ERROR_KEY]
390 raise errors.HypervisorError("kvm: error executing the %s"
391 " command: %s (%s, %s):" %
393 err[self._ERROR_DESC_KEY],
394 err[self._ERROR_CLASS_KEY],
395 err[self._ERROR_DATA_KEY]))
397 elif not response[self._EVENT_KEY]:
401 class KVMHypervisor(hv_base.BaseHypervisor):
402 """KVM hypervisor interface
407 _ROOT_DIR = constants.RUN_GANETI_DIR + "/kvm-hypervisor"
408 _PIDS_DIR = _ROOT_DIR + "/pid" # contains live instances pids
409 _UIDS_DIR = _ROOT_DIR + "/uid" # contains instances reserved uids
410 _CTRL_DIR = _ROOT_DIR + "/ctrl" # contains instances control sockets
411 _CONF_DIR = _ROOT_DIR + "/conf" # contains instances startup data
412 _NICS_DIR = _ROOT_DIR + "/nic" # contains instances nic <-> tap associations
413 _KEYMAP_DIR = _ROOT_DIR + "/keymap" # contains instances keymaps
414 # KVM instances with chroot enabled are started in empty chroot directories.
415 _CHROOT_DIR = _ROOT_DIR + "/chroot" # for empty chroot directories
416 # After an instance is stopped, its chroot directory is removed.
417 # If the chroot directory is not empty, it can't be removed.
418 # A non-empty chroot directory indicates a possible security incident.
419 # To support forensics, the non-empty chroot directory is quarantined in
420 # a separate directory, called 'chroot-quarantine'.
421 _CHROOT_QUARANTINE_DIR = _ROOT_DIR + "/chroot-quarantine"
422 _DIRS = [_ROOT_DIR, _PIDS_DIR, _UIDS_DIR, _CTRL_DIR, _CONF_DIR, _NICS_DIR,
423 _CHROOT_DIR, _CHROOT_QUARANTINE_DIR]
426 constants.HV_KERNEL_PATH: hv_base.OPT_FILE_CHECK,
427 constants.HV_INITRD_PATH: hv_base.OPT_FILE_CHECK,
428 constants.HV_ROOT_PATH: hv_base.NO_CHECK,
429 constants.HV_KERNEL_ARGS: hv_base.NO_CHECK,
430 constants.HV_ACPI: hv_base.NO_CHECK,
431 constants.HV_SERIAL_CONSOLE: hv_base.NO_CHECK,
432 constants.HV_VNC_BIND_ADDRESS:
433 (False, lambda x: (netutils.IP4Address.IsValid(x) or
434 utils.IsNormAbsPath(x)),
435 "the VNC bind address must be either a valid IP address or an absolute"
436 " pathname", None, None),
437 constants.HV_VNC_TLS: hv_base.NO_CHECK,
438 constants.HV_VNC_X509: hv_base.OPT_DIR_CHECK,
439 constants.HV_VNC_X509_VERIFY: hv_base.NO_CHECK,
440 constants.HV_VNC_PASSWORD_FILE: hv_base.OPT_FILE_CHECK,
441 constants.HV_KVM_SPICE_BIND: hv_base.NO_CHECK, # will be checked later
442 constants.HV_KVM_SPICE_IP_VERSION:
443 (False, lambda x: (x == constants.IFACE_NO_IP_VERSION_SPECIFIED or
444 x in constants.VALID_IP_VERSIONS),
445 "the SPICE IP version should be 4 or 6",
447 constants.HV_KVM_SPICE_PASSWORD_FILE: hv_base.OPT_FILE_CHECK,
448 constants.HV_KVM_SPICE_LOSSLESS_IMG_COMPR:
449 hv_base.ParamInSet(False,
450 constants.HT_KVM_SPICE_VALID_LOSSLESS_IMG_COMPR_OPTIONS),
451 constants.HV_KVM_SPICE_JPEG_IMG_COMPR:
452 hv_base.ParamInSet(False,
453 constants.HT_KVM_SPICE_VALID_LOSSY_IMG_COMPR_OPTIONS),
454 constants.HV_KVM_SPICE_ZLIB_GLZ_IMG_COMPR:
455 hv_base.ParamInSet(False,
456 constants.HT_KVM_SPICE_VALID_LOSSY_IMG_COMPR_OPTIONS),
457 constants.HV_KVM_SPICE_STREAMING_VIDEO_DETECTION:
458 hv_base.ParamInSet(False,
459 constants.HT_KVM_SPICE_VALID_VIDEO_STREAM_DETECTION_OPTIONS),
460 constants.HV_KVM_SPICE_AUDIO_COMPR: hv_base.NO_CHECK,
461 constants.HV_KVM_SPICE_USE_TLS: hv_base.NO_CHECK,
462 constants.HV_KVM_SPICE_TLS_CIPHERS: hv_base.NO_CHECK,
463 constants.HV_KVM_SPICE_USE_VDAGENT: hv_base.NO_CHECK,
464 constants.HV_KVM_FLOPPY_IMAGE_PATH: hv_base.OPT_FILE_CHECK,
465 constants.HV_CDROM_IMAGE_PATH: hv_base.OPT_FILE_CHECK,
466 constants.HV_KVM_CDROM2_IMAGE_PATH: hv_base.OPT_FILE_CHECK,
467 constants.HV_BOOT_ORDER:
468 hv_base.ParamInSet(True, constants.HT_KVM_VALID_BO_TYPES),
469 constants.HV_NIC_TYPE:
470 hv_base.ParamInSet(True, constants.HT_KVM_VALID_NIC_TYPES),
471 constants.HV_DISK_TYPE:
472 hv_base.ParamInSet(True, constants.HT_KVM_VALID_DISK_TYPES),
473 constants.HV_KVM_CDROM_DISK_TYPE:
474 hv_base.ParamInSet(False, constants.HT_KVM_VALID_DISK_TYPES),
475 constants.HV_USB_MOUSE:
476 hv_base.ParamInSet(False, constants.HT_KVM_VALID_MOUSE_TYPES),
477 constants.HV_KEYMAP: hv_base.NO_CHECK,
478 constants.HV_MIGRATION_PORT: hv_base.REQ_NET_PORT_CHECK,
479 constants.HV_MIGRATION_BANDWIDTH: hv_base.NO_CHECK,
480 constants.HV_MIGRATION_DOWNTIME: hv_base.NO_CHECK,
481 constants.HV_MIGRATION_MODE: hv_base.MIGRATION_MODE_CHECK,
482 constants.HV_USE_LOCALTIME: hv_base.NO_CHECK,
483 constants.HV_DISK_CACHE:
484 hv_base.ParamInSet(True, constants.HT_VALID_CACHE_TYPES),
485 constants.HV_SECURITY_MODEL:
486 hv_base.ParamInSet(True, constants.HT_KVM_VALID_SM_TYPES),
487 constants.HV_SECURITY_DOMAIN: hv_base.NO_CHECK,
488 constants.HV_KVM_FLAG:
489 hv_base.ParamInSet(False, constants.HT_KVM_FLAG_VALUES),
490 constants.HV_VHOST_NET: hv_base.NO_CHECK,
491 constants.HV_KVM_USE_CHROOT: hv_base.NO_CHECK,
492 constants.HV_MEM_PATH: hv_base.OPT_DIR_CHECK,
493 constants.HV_REBOOT_BEHAVIOR:
494 hv_base.ParamInSet(True, constants.REBOOT_BEHAVIORS),
495 constants.HV_CPU_MASK: hv_base.OPT_MULTI_CPU_MASK_CHECK,
498 _MIGRATION_STATUS_RE = re.compile("Migration\s+status:\s+(\w+)",
500 _MIGRATION_PROGRESS_RE = \
501 re.compile(r"\s*transferred\s+ram:\s+(?P<transferred>\d+)\s+kbytes\s*\n"
502 r"\s*remaining\s+ram:\s+(?P<remaining>\d+)\s+kbytes\s*\n"
503 r"\s*total\s+ram:\s+(?P<total>\d+)\s+kbytes\s*\n", re.I)
505 _MIGRATION_INFO_MAX_BAD_ANSWERS = 5
506 _MIGRATION_INFO_RETRY_DELAY = 2
508 _VERSION_RE = re.compile(r"\b(\d+)\.(\d+)(\.(\d+))?\b")
510 _CPU_INFO_RE = re.compile(r"cpu\s+\#(\d+).*thread_id\s*=\s*(\d+)", re.I)
511 _CPU_INFO_CMD = "info cpus"
517 ANCILLARY_FILES_OPT = [
522 hv_base.BaseHypervisor.__init__(self)
523 # Let's make sure the directories we need exist, even if the RUN_DIR lives
524 # in a tmpfs filesystem or has been otherwise wiped out.
525 dirs = [(dname, constants.RUN_DIRS_MODE) for dname in self._DIRS]
526 utils.EnsureDirs(dirs)
529 def _InstancePidFile(cls, instance_name):
530 """Returns the instance pidfile.
533 return utils.PathJoin(cls._PIDS_DIR, instance_name)
536 def _InstanceUidFile(cls, instance_name):
537 """Returns the instance uidfile.
540 return utils.PathJoin(cls._UIDS_DIR, instance_name)
543 def _InstancePidInfo(cls, pid):
544 """Check pid file for instance information.
546 Check that a pid file is associated with an instance, and retrieve
547 information from its command line.
549 @type pid: string or int
550 @param pid: process id of the instance to check
552 @return: (instance_name, memory, vcpus)
553 @raise errors.HypervisorError: when an instance cannot be found
556 alive = utils.IsProcessAlive(pid)
558 raise errors.HypervisorError("Cannot get info for pid %s" % pid)
560 cmdline_file = utils.PathJoin("/proc", str(pid), "cmdline")
562 cmdline = utils.ReadFile(cmdline_file)
563 except EnvironmentError, err:
564 raise errors.HypervisorError("Can't open cmdline file for pid %s: %s" %
571 arg_list = cmdline.split("\x00")
573 arg = arg_list.pop(0)
575 instance = arg_list.pop(0)
577 memory = int(arg_list.pop(0))
579 vcpus = int(arg_list.pop(0))
582 raise errors.HypervisorError("Pid %s doesn't contain a ganeti kvm"
585 return (instance, memory, vcpus)
587 def _InstancePidAlive(self, instance_name):
588 """Returns the instance pidfile, pid, and liveness.
590 @type instance_name: string
591 @param instance_name: instance name
593 @return: (pid file name, pid, liveness)
596 pidfile = self._InstancePidFile(instance_name)
597 pid = utils.ReadPidFile(pidfile)
601 cmd_instance = self._InstancePidInfo(pid)[0]
602 alive = (cmd_instance == instance_name)
603 except errors.HypervisorError:
606 return (pidfile, pid, alive)
608 def _CheckDown(self, instance_name):
609 """Raises an error unless the given instance is down.
612 alive = self._InstancePidAlive(instance_name)[2]
614 raise errors.HypervisorError("Failed to start instance %s: %s" %
615 (instance_name, "already running"))
618 def _InstanceMonitor(cls, instance_name):
619 """Returns the instance monitor socket name
622 return utils.PathJoin(cls._CTRL_DIR, "%s.monitor" % instance_name)
625 def _InstanceSerial(cls, instance_name):
626 """Returns the instance serial socket name
629 return utils.PathJoin(cls._CTRL_DIR, "%s.serial" % instance_name)
632 def _InstanceQmpMonitor(cls, instance_name):
633 """Returns the instance serial QMP socket name
636 return utils.PathJoin(cls._CTRL_DIR, "%s.qmp" % instance_name)
639 def _SocatUnixConsoleParams():
640 """Returns the correct parameters for socat
642 If we have a new-enough socat we can use raw mode with an escape character.
645 if constants.SOCAT_USE_ESCAPE:
646 return "raw,echo=0,escape=%s" % constants.SOCAT_ESCAPE_CODE
648 return "echo=0,icanon=0"
651 def _InstanceKVMRuntime(cls, instance_name):
652 """Returns the instance KVM runtime filename
655 return utils.PathJoin(cls._CONF_DIR, "%s.runtime" % instance_name)
658 def _InstanceChrootDir(cls, instance_name):
659 """Returns the name of the KVM chroot dir of the instance
662 return utils.PathJoin(cls._CHROOT_DIR, instance_name)
665 def _InstanceNICDir(cls, instance_name):
666 """Returns the name of the directory holding the tap device files for a
670 return utils.PathJoin(cls._NICS_DIR, instance_name)
673 def _InstanceNICFile(cls, instance_name, seq):
674 """Returns the name of the file containing the tap device for a given NIC
677 return utils.PathJoin(cls._InstanceNICDir(instance_name), str(seq))
680 def _InstanceKeymapFile(cls, instance_name):
681 """Returns the name of the file containing the keymap for a given instance
684 return utils.PathJoin(cls._KEYMAP_DIR, instance_name)
687 def _TryReadUidFile(cls, uid_file):
688 """Try to read a uid file
691 if os.path.exists(uid_file):
693 uid = int(utils.ReadOneLineFile(uid_file))
695 except EnvironmentError:
696 logging.warning("Can't read uid file", exc_info=True)
697 except (TypeError, ValueError):
698 logging.warning("Can't parse uid file contents", exc_info=True)
702 def _RemoveInstanceRuntimeFiles(cls, pidfile, instance_name):
703 """Removes an instance's rutime sockets/files/dirs.
706 utils.RemoveFile(pidfile)
707 utils.RemoveFile(cls._InstanceMonitor(instance_name))
708 utils.RemoveFile(cls._InstanceSerial(instance_name))
709 utils.RemoveFile(cls._InstanceQmpMonitor(instance_name))
710 utils.RemoveFile(cls._InstanceKVMRuntime(instance_name))
711 utils.RemoveFile(cls._InstanceKeymapFile(instance_name))
712 uid_file = cls._InstanceUidFile(instance_name)
713 uid = cls._TryReadUidFile(uid_file)
714 utils.RemoveFile(uid_file)
716 uidpool.ReleaseUid(uid)
718 shutil.rmtree(cls._InstanceNICDir(instance_name))
720 if err.errno != errno.ENOENT:
723 chroot_dir = cls._InstanceChrootDir(instance_name)
724 utils.RemoveDir(chroot_dir)
726 if err.errno == errno.ENOTEMPTY:
727 # The chroot directory is expected to be empty, but it isn't.
728 new_chroot_dir = tempfile.mkdtemp(dir=cls._CHROOT_QUARANTINE_DIR,
731 utils.TimestampForFilename()))
732 logging.warning("The chroot directory of instance %s can not be"
733 " removed as it is not empty. Moving it to the"
734 " quarantine instead. Please investigate the"
735 " contents (%s) and clean up manually",
736 instance_name, new_chroot_dir)
737 utils.RenameFile(chroot_dir, new_chroot_dir)
742 def _ConfigureNIC(instance, seq, nic, tap):
743 """Run the network configuration script for a specified NIC
745 @param instance: instance we're acting on
746 @type instance: instance object
747 @param seq: nic sequence number
749 @param nic: nic we're acting on
750 @type nic: nic object
751 @param tap: the host's tap interface this NIC corresponds to
756 tags = " ".join(instance.tags)
761 "PATH": "%s:/sbin:/usr/sbin" % os.environ["PATH"],
762 "INSTANCE": instance.name,
764 "MODE": nic.nicparams[constants.NIC_MODE],
766 "INTERFACE_INDEX": str(seq),
773 if nic.nicparams[constants.NIC_LINK]:
774 env["LINK"] = nic.nicparams[constants.NIC_LINK]
776 if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
777 env["BRIDGE"] = nic.nicparams[constants.NIC_LINK]
779 result = utils.RunCmd([constants.KVM_IFUP, tap], env=env)
781 raise errors.HypervisorError("Failed to configure interface %s: %s."
782 " Network configuration script output: %s" %
783 (tap, result.fail_reason, result.output))
786 def _VerifyAffinityPackage():
788 raise errors.HypervisorError("affinity Python package not"
789 " found; cannot use CPU pinning under KVM")
792 def _BuildAffinityCpuMask(cpu_list):
793 """Create a CPU mask suitable for sched_setaffinity from a list of
796 See man taskset for more info on sched_setaffinity masks.
797 For example: [ 0, 2, 5, 6 ] will return 101 (0x65, 0..01100101).
799 @type cpu_list: list of int
800 @param cpu_list: list of physical CPU numbers to map to vCPUs in order
802 @return: a bit mask of CPU affinities
805 if cpu_list == constants.CPU_PINNING_OFF:
806 return constants.CPU_PINNING_ALL_KVM
808 return sum(2 ** cpu for cpu in cpu_list)
811 def _AssignCpuAffinity(cls, cpu_mask, process_id, thread_dict):
812 """Change CPU affinity for running VM according to given CPU mask.
814 @param cpu_mask: CPU mask as given by the user. e.g. "0-2,4:all:1,3"
815 @type cpu_mask: string
816 @param process_id: process ID of KVM process. Used to pin entire VM
818 @type process_id: int
819 @param thread_dict: map of virtual CPUs to KVM thread IDs
820 @type thread_dict: dict int:int
823 # Convert the string CPU mask to a list of list of int's
824 cpu_list = utils.ParseMultiCpuMask(cpu_mask)
826 if len(cpu_list) == 1:
827 all_cpu_mapping = cpu_list[0]
828 if all_cpu_mapping == constants.CPU_PINNING_OFF:
829 # If CPU pinning has 1 entry that's "all", then do nothing
832 # If CPU pinning has one non-all entry, map the entire VM to
833 # one set of physical CPUs
834 cls._VerifyAffinityPackage()
835 affinity.set_process_affinity_mask(process_id,
836 cls._BuildAffinityCpuMask(all_cpu_mapping))
838 # The number of vCPUs mapped should match the number of vCPUs
839 # reported by KVM. This was already verified earlier, so
840 # here only as a sanity check.
841 assert len(thread_dict) == len(cpu_list)
842 cls._VerifyAffinityPackage()
844 # For each vCPU, map it to the proper list of physical CPUs
845 for vcpu, i in zip(cpu_list, range(len(cpu_list))):
846 affinity.set_process_affinity_mask(thread_dict[i],
847 cls._BuildAffinityCpuMask(vcpu))
849 def _GetVcpuThreadIds(self, instance_name):
850 """Get a mapping of vCPU no. to thread IDs for the instance
852 @type instance_name: string
853 @param instance_name: instance in question
854 @rtype: dictionary of int:int
855 @return: a dictionary mapping vCPU numbers to thread IDs
859 output = self._CallMonitorCommand(instance_name, self._CPU_INFO_CMD)
860 for line in output.stdout.splitlines():
861 match = self._CPU_INFO_RE.search(line)
864 grp = map(int, match.groups())
865 result[grp[0]] = grp[1]
869 def _ExecuteCpuAffinity(self, instance_name, cpu_mask):
870 """Complete CPU pinning.
872 @type instance_name: string
873 @param instance_name: name of instance
874 @type cpu_mask: string
875 @param cpu_mask: CPU pinning mask as entered by user
878 # Get KVM process ID, to be used if need to pin entire VM
879 _, pid, _ = self._InstancePidAlive(instance_name)
880 # Get vCPU thread IDs, to be used if need to pin vCPUs separately
881 thread_dict = self._GetVcpuThreadIds(instance_name)
882 # Run CPU pinning, based on configured mask
883 self._AssignCpuAffinity(cpu_mask, pid, thread_dict)
885 def ListInstances(self):
886 """Get the list of running instances.
888 We can do this by listing our live instances directory and
889 checking whether the associated kvm process is still alive.
893 for name in os.listdir(self._PIDS_DIR):
894 if self._InstancePidAlive(name)[2]:
898 def GetInstanceInfo(self, instance_name):
899 """Get instance properties.
901 @type instance_name: string
902 @param instance_name: the instance name
903 @rtype: tuple of strings
904 @return: (name, id, memory, vcpus, stat, times)
907 _, pid, alive = self._InstancePidAlive(instance_name)
911 _, memory, vcpus = self._InstancePidInfo(pid)
916 qmp = QmpConnection(self._InstanceQmpMonitor(instance_name))
918 vcpus = len(qmp.Execute("query-cpus")[qmp.RETURN_KEY])
919 # Will fail if ballooning is not enabled, but we can then just resort to
921 mem_bytes = qmp.Execute("query-balloon")[qmp.RETURN_KEY][qmp.ACTUAL_KEY]
922 memory = mem_bytes / 1048576
923 except errors.HypervisorError:
926 return (instance_name, pid, memory, vcpus, istat, times)
928 def GetAllInstancesInfo(self):
929 """Get properties of all instances.
931 @return: list of tuples (name, id, memory, vcpus, stat, times)
935 for name in os.listdir(self._PIDS_DIR):
937 info = self.GetInstanceInfo(name)
938 except errors.HypervisorError:
944 def _GenerateKVMRuntime(self, instance, block_devices, startup_paused):
945 """Generate KVM information to start an instance.
948 # pylint: disable=R0914,R0915
949 _, v_major, v_min, _ = self._GetKVMVersion()
951 pidfile = self._InstancePidFile(instance.name)
952 kvm = constants.KVM_PATH
954 # used just by the vnc server, if enabled
955 kvm_cmd.extend(["-name", instance.name])
956 kvm_cmd.extend(["-m", instance.beparams[constants.BE_MAXMEM]])
957 kvm_cmd.extend(["-smp", instance.beparams[constants.BE_VCPUS]])
958 kvm_cmd.extend(["-pidfile", pidfile])
959 kvm_cmd.extend(["-balloon", "virtio"])
960 kvm_cmd.extend(["-daemonize"])
961 if not instance.hvparams[constants.HV_ACPI]:
962 kvm_cmd.extend(["-no-acpi"])
963 if instance.hvparams[constants.HV_REBOOT_BEHAVIOR] == \
964 constants.INSTANCE_REBOOT_EXIT:
965 kvm_cmd.extend(["-no-reboot"])
967 hvp = instance.hvparams
968 boot_disk = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_DISK
969 boot_cdrom = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_CDROM
970 boot_floppy = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_FLOPPY
971 boot_network = hvp[constants.HV_BOOT_ORDER] == constants.HT_BO_NETWORK
973 self.ValidateParameters(hvp)
976 kvm_cmd.extend([_KVM_START_PAUSED_FLAG])
978 if hvp[constants.HV_KVM_FLAG] == constants.HT_KVM_ENABLED:
979 kvm_cmd.extend(["-enable-kvm"])
980 elif hvp[constants.HV_KVM_FLAG] == constants.HT_KVM_DISABLED:
981 kvm_cmd.extend(["-disable-kvm"])
984 kvm_cmd.extend(["-boot", "n"])
986 disk_type = hvp[constants.HV_DISK_TYPE]
987 if disk_type == constants.HT_DISK_PARAVIRTUAL:
988 if_val = ",if=virtio"
990 if_val = ",if=%s" % disk_type
992 disk_cache = hvp[constants.HV_DISK_CACHE]
993 if instance.disk_template in constants.DTS_EXT_MIRROR:
994 if disk_cache != "none":
995 # TODO: make this a hard error, instead of a silent overwrite
996 logging.warning("KVM: overriding disk_cache setting '%s' with 'none'"
997 " to prevent shared storage corruption on migration",
999 cache_val = ",cache=none"
1000 elif disk_cache != constants.HT_CACHE_DEFAULT:
1001 cache_val = ",cache=%s" % disk_cache
1004 for cfdev, dev_path in block_devices:
1005 if cfdev.mode != constants.DISK_RDWR:
1006 raise errors.HypervisorError("Instance has read-only disks which"
1007 " are not supported by KVM")
1008 # TODO: handle FD_LOOP and FD_BLKTAP (?)
1011 kvm_cmd.extend(["-boot", "c"])
1013 if (v_major, v_min) < (0, 14) and disk_type != constants.HT_DISK_IDE:
1014 boot_val = ",boot=on"
1016 drive_val = "file=%s,format=raw%s%s%s" % (dev_path, if_val, boot_val,
1018 kvm_cmd.extend(["-drive", drive_val])
1020 #Now we can specify a different device type for CDROM devices.
1021 cdrom_disk_type = hvp[constants.HV_KVM_CDROM_DISK_TYPE]
1022 if not cdrom_disk_type:
1023 cdrom_disk_type = disk_type
1025 iso_image = hvp[constants.HV_CDROM_IMAGE_PATH]
1027 options = ",format=raw,media=cdrom"
1029 kvm_cmd.extend(["-boot", "d"])
1030 if cdrom_disk_type != constants.HT_DISK_IDE:
1031 options = "%s,boot=on,if=%s" % (options, constants.HT_DISK_IDE)
1033 options = "%s,boot=on" % options
1035 if cdrom_disk_type == constants.HT_DISK_PARAVIRTUAL:
1036 if_val = ",if=virtio"
1038 if_val = ",if=%s" % cdrom_disk_type
1039 options = "%s%s" % (options, if_val)
1040 drive_val = "file=%s%s" % (iso_image, options)
1041 kvm_cmd.extend(["-drive", drive_val])
1043 iso_image2 = hvp[constants.HV_KVM_CDROM2_IMAGE_PATH]
1045 options = ",format=raw,media=cdrom"
1046 if cdrom_disk_type == constants.HT_DISK_PARAVIRTUAL:
1047 if_val = ",if=virtio"
1049 if_val = ",if=%s" % cdrom_disk_type
1050 options = "%s%s" % (options, if_val)
1051 drive_val = "file=%s%s" % (iso_image2, options)
1052 kvm_cmd.extend(["-drive", drive_val])
1054 floppy_image = hvp[constants.HV_KVM_FLOPPY_IMAGE_PATH]
1056 options = ",format=raw,media=disk"
1058 kvm_cmd.extend(["-boot", "a"])
1059 options = "%s,boot=on" % options
1060 if_val = ",if=floppy"
1061 options = "%s%s" % (options, if_val)
1062 drive_val = "file=%s%s" % (floppy_image, options)
1063 kvm_cmd.extend(["-drive", drive_val])
1065 kernel_path = hvp[constants.HV_KERNEL_PATH]
1067 kvm_cmd.extend(["-kernel", kernel_path])
1068 initrd_path = hvp[constants.HV_INITRD_PATH]
1070 kvm_cmd.extend(["-initrd", initrd_path])
1071 root_append = ["root=%s" % hvp[constants.HV_ROOT_PATH],
1072 hvp[constants.HV_KERNEL_ARGS]]
1073 if hvp[constants.HV_SERIAL_CONSOLE]:
1074 root_append.append("console=ttyS0,38400")
1075 kvm_cmd.extend(["-append", " ".join(root_append)])
1077 mem_path = hvp[constants.HV_MEM_PATH]
1079 kvm_cmd.extend(["-mem-path", mem_path, "-mem-prealloc"])
1081 mouse_type = hvp[constants.HV_USB_MOUSE]
1082 vnc_bind_address = hvp[constants.HV_VNC_BIND_ADDRESS]
1085 kvm_cmd.extend(["-usb"])
1086 kvm_cmd.extend(["-usbdevice", mouse_type])
1087 elif vnc_bind_address:
1088 kvm_cmd.extend(["-usbdevice", constants.HT_MOUSE_TABLET])
1090 keymap = hvp[constants.HV_KEYMAP]
1092 keymap_path = self._InstanceKeymapFile(instance.name)
1093 # If a keymap file is specified, KVM won't use its internal defaults. By
1094 # first including the "en-us" layout, an error on loading the actual
1095 # layout (e.g. because it can't be found) won't lead to a non-functional
1096 # keyboard. A keyboard with incorrect keys is still better than none.
1097 utils.WriteFile(keymap_path, data="include en-us\ninclude %s\n" % keymap)
1098 kvm_cmd.extend(["-k", keymap_path])
1100 if vnc_bind_address:
1101 if netutils.IP4Address.IsValid(vnc_bind_address):
1102 if instance.network_port > constants.VNC_BASE_PORT:
1103 display = instance.network_port - constants.VNC_BASE_PORT
1104 if vnc_bind_address == constants.IP4_ADDRESS_ANY:
1105 vnc_arg = ":%d" % (display)
1107 vnc_arg = "%s:%d" % (vnc_bind_address, display)
1109 logging.error("Network port is not a valid VNC display (%d < %d)."
1110 " Not starting VNC", instance.network_port,
1111 constants.VNC_BASE_PORT)
1114 # Only allow tls and other option when not binding to a file, for now.
1115 # kvm/qemu gets confused otherwise about the filename to use.
1117 if hvp[constants.HV_VNC_TLS]:
1118 vnc_append = "%s,tls" % vnc_append
1119 if hvp[constants.HV_VNC_X509_VERIFY]:
1120 vnc_append = "%s,x509verify=%s" % (vnc_append,
1121 hvp[constants.HV_VNC_X509])
1122 elif hvp[constants.HV_VNC_X509]:
1123 vnc_append = "%s,x509=%s" % (vnc_append,
1124 hvp[constants.HV_VNC_X509])
1125 if hvp[constants.HV_VNC_PASSWORD_FILE]:
1126 vnc_append = "%s,password" % vnc_append
1128 vnc_arg = "%s%s" % (vnc_arg, vnc_append)
1131 vnc_arg = "unix:%s/%s.vnc" % (vnc_bind_address, instance.name)
1133 kvm_cmd.extend(["-vnc", vnc_arg])
1135 kvm_cmd.extend(["-nographic"])
1137 monitor_dev = ("unix:%s,server,nowait" %
1138 self._InstanceMonitor(instance.name))
1139 kvm_cmd.extend(["-monitor", monitor_dev])
1140 if hvp[constants.HV_SERIAL_CONSOLE]:
1141 serial_dev = ("unix:%s,server,nowait" %
1142 self._InstanceSerial(instance.name))
1143 kvm_cmd.extend(["-serial", serial_dev])
1145 kvm_cmd.extend(["-serial", "none"])
1147 spice_bind = hvp[constants.HV_KVM_SPICE_BIND]
1148 spice_ip_version = None
1150 if netutils.IsValidInterface(spice_bind):
1151 # The user specified a network interface, we have to figure out the IP
1153 addresses = netutils.GetInterfaceIpAddresses(spice_bind)
1154 spice_ip_version = hvp[constants.HV_KVM_SPICE_IP_VERSION]
1156 # if the user specified an IP version and the interface does not
1157 # have that kind of IP addresses, throw an exception
1158 if spice_ip_version != constants.IFACE_NO_IP_VERSION_SPECIFIED:
1159 if not addresses[spice_ip_version]:
1160 raise errors.HypervisorError("spice: unable to get an IPv%s address"
1161 " for %s" % (spice_ip_version,
1164 # the user did not specify an IP version, we have to figure it out
1165 elif (addresses[constants.IP4_VERSION] and
1166 addresses[constants.IP6_VERSION]):
1167 # we have both ipv4 and ipv6, let's use the cluster default IP
1169 cluster_family = ssconf.SimpleStore().GetPrimaryIPFamily()
1170 spice_ip_version = \
1171 netutils.IPAddress.GetVersionFromAddressFamily(cluster_family)
1172 elif addresses[constants.IP4_VERSION]:
1173 spice_ip_version = constants.IP4_VERSION
1174 elif addresses[constants.IP6_VERSION]:
1175 spice_ip_version = constants.IP6_VERSION
1177 raise errors.HypervisorError("spice: unable to get an IP address"
1178 " for %s" % (spice_bind))
1180 spice_address = addresses[spice_ip_version][0]
1183 # spice_bind is known to be a valid IP address, because
1184 # ValidateParameters checked it.
1185 spice_address = spice_bind
1187 spice_arg = "addr=%s" % spice_address
1188 if hvp[constants.HV_KVM_SPICE_USE_TLS]:
1189 spice_arg = "%s,tls-port=%s,x509-cacert-file=%s" % (spice_arg,
1190 instance.network_port, constants.SPICE_CACERT_FILE)
1191 spice_arg = "%s,x509-key-file=%s,x509-cert-file=%s" % (spice_arg,
1192 constants.SPICE_CERT_FILE, constants.SPICE_CERT_FILE)
1193 tls_ciphers = hvp[constants.HV_KVM_SPICE_TLS_CIPHERS]
1195 spice_arg = "%s,tls-ciphers=%s" % (spice_arg, tls_ciphers)
1197 spice_arg = "%s,port=%s" % (spice_arg, instance.network_port)
1199 if not hvp[constants.HV_KVM_SPICE_PASSWORD_FILE]:
1200 spice_arg = "%s,disable-ticketing" % spice_arg
1202 if spice_ip_version:
1203 spice_arg = "%s,ipv%s" % (spice_arg, spice_ip_version)
1205 # Image compression options
1206 img_lossless = hvp[constants.HV_KVM_SPICE_LOSSLESS_IMG_COMPR]
1207 img_jpeg = hvp[constants.HV_KVM_SPICE_JPEG_IMG_COMPR]
1208 img_zlib_glz = hvp[constants.HV_KVM_SPICE_ZLIB_GLZ_IMG_COMPR]
1210 spice_arg = "%s,image-compression=%s" % (spice_arg, img_lossless)
1212 spice_arg = "%s,jpeg-wan-compression=%s" % (spice_arg, img_jpeg)
1214 spice_arg = "%s,zlib-glz-wan-compression=%s" % (spice_arg, img_zlib_glz)
1216 # Video stream detection
1217 video_streaming = hvp[constants.HV_KVM_SPICE_STREAMING_VIDEO_DETECTION]
1219 spice_arg = "%s,streaming-video=%s" % (spice_arg, video_streaming)
1221 # Audio compression, by default in qemu-kvm it is on
1222 if not hvp[constants.HV_KVM_SPICE_AUDIO_COMPR]:
1223 spice_arg = "%s,playback-compression=off" % spice_arg
1224 if not hvp[constants.HV_KVM_SPICE_USE_VDAGENT]:
1225 spice_arg = "%s,agent-mouse=off" % spice_arg
1227 logging.info("KVM: SPICE will listen on port %s", instance.network_port)
1228 kvm_cmd.extend(["-spice", spice_arg])
1230 # Tell kvm to use the paravirtualized graphic card, optimized for SPICE
1231 kvm_cmd.extend(["-vga", "qxl"])
1233 if hvp[constants.HV_USE_LOCALTIME]:
1234 kvm_cmd.extend(["-localtime"])
1236 if hvp[constants.HV_KVM_USE_CHROOT]:
1237 kvm_cmd.extend(["-chroot", self._InstanceChrootDir(instance.name)])
1239 # Save the current instance nics, but defer their expansion as parameters,
1240 # as we'll need to generate executable temp files for them.
1241 kvm_nics = instance.nics
1244 return (kvm_cmd, kvm_nics, hvparams)
1246 def _WriteKVMRuntime(self, instance_name, data):
1247 """Write an instance's KVM runtime
1251 utils.WriteFile(self._InstanceKVMRuntime(instance_name),
1253 except EnvironmentError, err:
1254 raise errors.HypervisorError("Failed to save KVM runtime file: %s" % err)
1256 def _ReadKVMRuntime(self, instance_name):
1257 """Read an instance's KVM runtime
1261 file_content = utils.ReadFile(self._InstanceKVMRuntime(instance_name))
1262 except EnvironmentError, err:
1263 raise errors.HypervisorError("Failed to load KVM runtime file: %s" % err)
1266 def _SaveKVMRuntime(self, instance, kvm_runtime):
1267 """Save an instance's KVM runtime
1270 kvm_cmd, kvm_nics, hvparams = kvm_runtime
1271 serialized_nics = [nic.ToDict() for nic in kvm_nics]
1272 serialized_form = serializer.Dump((kvm_cmd, serialized_nics, hvparams))
1273 self._WriteKVMRuntime(instance.name, serialized_form)
1275 def _LoadKVMRuntime(self, instance, serialized_runtime=None):
1276 """Load an instance's KVM runtime
1279 if not serialized_runtime:
1280 serialized_runtime = self._ReadKVMRuntime(instance.name)
1281 loaded_runtime = serializer.Load(serialized_runtime)
1282 kvm_cmd, serialized_nics, hvparams = loaded_runtime
1283 kvm_nics = [objects.NIC.FromDict(snic) for snic in serialized_nics]
1284 return (kvm_cmd, kvm_nics, hvparams)
1286 def _RunKVMCmd(self, name, kvm_cmd, tap_fds=None):
1287 """Run the KVM cmd and check for errors
1290 @param name: instance name
1291 @type kvm_cmd: list of strings
1292 @param kvm_cmd: runcmd input for kvm
1293 @type tap_fds: list of int
1294 @param tap_fds: fds of tap devices opened by Ganeti
1298 result = utils.RunCmd(kvm_cmd, noclose_fds=tap_fds)
1301 utils_wrapper.CloseFdNoError(fd)
1304 raise errors.HypervisorError("Failed to start instance %s: %s (%s)" %
1305 (name, result.fail_reason, result.output))
1306 if not self._InstancePidAlive(name)[2]:
1307 raise errors.HypervisorError("Failed to start instance %s" % name)
1309 def _ExecuteKVMRuntime(self, instance, kvm_runtime, incoming=None):
1310 """Execute a KVM cmd, after completing it with some last minute data
1312 @type incoming: tuple of strings
1313 @param incoming: (target_host_ip, port)
1316 # Small _ExecuteKVMRuntime hv parameters programming howto:
1317 # - conf_hvp contains the parameters as configured on ganeti. they might
1318 # have changed since the instance started; only use them if the change
1319 # won't affect the inside of the instance (which hasn't been rebooted).
1320 # - up_hvp contains the parameters as they were when the instance was
1321 # started, plus any new parameter which has been added between ganeti
1322 # versions: it is paramount that those default to a value which won't
1323 # affect the inside of the instance as well.
1324 conf_hvp = instance.hvparams
1325 name = instance.name
1326 self._CheckDown(name)
1330 kvm_cmd, kvm_nics, up_hvp = kvm_runtime
1331 up_hvp = objects.FillDict(conf_hvp, up_hvp)
1333 _, v_major, v_min, _ = self._GetKVMVersion()
1335 # We know it's safe to run as a different user upon migration, so we'll use
1336 # the latest conf, from conf_hvp.
1337 security_model = conf_hvp[constants.HV_SECURITY_MODEL]
1338 if security_model == constants.HT_SM_USER:
1339 kvm_cmd.extend(["-runas", conf_hvp[constants.HV_SECURITY_DOMAIN]])
1341 # We have reasons to believe changing something like the nic driver/type
1342 # upon migration won't exactly fly with the instance kernel, so for nic
1343 # related parameters we'll use up_hvp
1347 kvm_cmd.extend(["-net", "none"])
1351 nic_type = up_hvp[constants.HV_NIC_TYPE]
1352 if nic_type == constants.HT_NIC_PARAVIRTUAL:
1353 # From version 0.12.0, kvm uses a new sintax for network configuration.
1354 if (v_major, v_min) >= (0, 12):
1355 nic_model = "virtio-net-pci"
1358 nic_model = "virtio"
1360 if up_hvp[constants.HV_VHOST_NET]:
1361 # vhost_net is only available from version 0.13.0 or newer
1362 if (v_major, v_min) >= (0, 13):
1363 tap_extra = ",vhost=on"
1365 raise errors.HypervisorError("vhost_net is configured"
1366 " but it is not available")
1368 nic_model = nic_type
1370 for nic_seq, nic in enumerate(kvm_nics):
1371 tapname, tapfd = _OpenTap(vnet_hdr)
1372 tapfds.append(tapfd)
1373 taps.append(tapname)
1374 if (v_major, v_min) >= (0, 12):
1375 nic_val = "%s,mac=%s,netdev=netdev%s" % (nic_model, nic.mac, nic_seq)
1376 tap_val = "type=tap,id=netdev%s,fd=%d%s" % (nic_seq, tapfd, tap_extra)
1377 kvm_cmd.extend(["-netdev", tap_val, "-device", nic_val])
1379 nic_val = "nic,vlan=%s,macaddr=%s,model=%s" % (nic_seq,
1381 tap_val = "tap,vlan=%s,fd=%d" % (nic_seq, tapfd)
1382 kvm_cmd.extend(["-net", tap_val, "-net", nic_val])
1385 target, port = incoming
1386 kvm_cmd.extend(["-incoming", "tcp:%s:%s" % (target, port)])
1388 # Changing the vnc password doesn't bother the guest that much. At most it
1389 # will surprise people who connect to it. Whether positively or negatively
1391 vnc_pwd_file = conf_hvp[constants.HV_VNC_PASSWORD_FILE]
1395 vnc_pwd = utils.ReadOneLineFile(vnc_pwd_file, strict=True)
1396 except EnvironmentError, err:
1397 raise errors.HypervisorError("Failed to open VNC password file %s: %s"
1398 % (vnc_pwd_file, err))
1400 if conf_hvp[constants.HV_KVM_USE_CHROOT]:
1401 utils.EnsureDirs([(self._InstanceChrootDir(name),
1402 constants.SECURE_DIR_MODE)])
1404 # Automatically enable QMP if version is >= 0.14
1405 if (v_major, v_min) >= (0, 14):
1406 logging.debug("Enabling QMP")
1407 kvm_cmd.extend(["-qmp", "unix:%s,server,nowait" %
1408 self._InstanceQmpMonitor(instance.name)])
1410 # Configure the network now for starting instances and bridged interfaces,
1411 # during FinalizeMigration for incoming instances' routed interfaces
1412 for nic_seq, nic in enumerate(kvm_nics):
1414 nic.nicparams[constants.NIC_MODE] != constants.NIC_MODE_BRIDGED):
1416 self._ConfigureNIC(instance, nic_seq, nic, taps[nic_seq])
1418 # CPU affinity requires kvm to start paused, so we set this flag if the
1419 # instance is not already paused and if we are not going to accept a
1420 # migrating instance. In the latter case, pausing is not needed.
1421 start_kvm_paused = not (_KVM_START_PAUSED_FLAG in kvm_cmd) and not incoming
1422 if start_kvm_paused:
1423 kvm_cmd.extend([_KVM_START_PAUSED_FLAG])
1425 # Note: CPU pinning is using up_hvp since changes take effect
1426 # during instance startup anyway, and to avoid problems when soft
1427 # rebooting the instance.
1429 if up_hvp.get(constants.HV_CPU_MASK, None):
1432 if security_model == constants.HT_SM_POOL:
1433 ss = ssconf.SimpleStore()
1434 uid_pool = uidpool.ParseUidPool(ss.GetUidPool(), separator="\n")
1435 all_uids = set(uidpool.ExpandUidPool(uid_pool))
1436 uid = uidpool.RequestUnusedUid(all_uids)
1438 username = pwd.getpwuid(uid.GetUid()).pw_name
1439 kvm_cmd.extend(["-runas", username])
1440 self._RunKVMCmd(name, kvm_cmd, tapfds)
1442 uidpool.ReleaseUid(uid)
1446 utils.WriteFile(self._InstanceUidFile(name), data=uid.AsStr())
1448 self._RunKVMCmd(name, kvm_cmd, tapfds)
1450 utils.EnsureDirs([(self._InstanceNICDir(instance.name),
1451 constants.RUN_DIRS_MODE)])
1452 for nic_seq, tap in enumerate(taps):
1453 utils.WriteFile(self._InstanceNICFile(instance.name, nic_seq),
1457 change_cmd = "change vnc password %s" % vnc_pwd
1458 self._CallMonitorCommand(instance.name, change_cmd)
1460 # Setting SPICE password. We are not vulnerable to malicious passwordless
1461 # connection attempts because SPICE by default does not allow connections
1462 # if neither a password nor the "disable_ticketing" options are specified.
1463 # As soon as we send the password via QMP, that password is a valid ticket
1465 spice_password_file = conf_hvp[constants.HV_KVM_SPICE_PASSWORD_FILE]
1466 if spice_password_file:
1469 spice_pwd = utils.ReadOneLineFile(spice_password_file, strict=True)
1470 except EnvironmentError, err:
1471 raise errors.HypervisorError("Failed to open SPICE password file %s: %s"
1472 % (spice_password_file, err))
1474 qmp = QmpConnection(self._InstanceQmpMonitor(instance.name))
1477 "protocol": "spice",
1478 "password": spice_pwd,
1480 qmp.Execute("set_password", arguments)
1482 for filename in temp_files:
1483 utils.RemoveFile(filename)
1485 # If requested, set CPU affinity and resume instance execution
1487 self._ExecuteCpuAffinity(instance.name, up_hvp[constants.HV_CPU_MASK])
1489 start_memory = self._InstanceStartupMemory(instance)
1490 if start_memory < instance.beparams[constants.BE_MAXMEM]:
1491 self.BalloonInstanceMemory(instance, start_memory)
1493 if start_kvm_paused:
1494 # To control CPU pinning, ballooning, and vnc/spice passwords the VM was
1495 # started in a frozen state. If freezing was not explicitely requested
1496 # resume the vm status.
1497 self._CallMonitorCommand(instance.name, self._CONT_CMD)
1499 def StartInstance(self, instance, block_devices, startup_paused):
1500 """Start an instance.
1503 self._CheckDown(instance.name)
1504 kvm_runtime = self._GenerateKVMRuntime(instance, block_devices,
1506 self._SaveKVMRuntime(instance, kvm_runtime)
1507 self._ExecuteKVMRuntime(instance, kvm_runtime)
1509 def _CallMonitorCommand(self, instance_name, command):
1510 """Invoke a command on the instance monitor.
1513 socat = ("echo %s | %s STDIO UNIX-CONNECT:%s" %
1514 (utils.ShellQuote(command),
1515 constants.SOCAT_PATH,
1516 utils.ShellQuote(self._InstanceMonitor(instance_name))))
1517 result = utils.RunCmd(socat)
1519 msg = ("Failed to send command '%s' to instance %s."
1520 " output: %s, error: %s, fail_reason: %s" %
1521 (command, instance_name,
1522 result.stdout, result.stderr, result.fail_reason))
1523 raise errors.HypervisorError(msg)
1528 def _ParseKVMVersion(cls, text):
1529 """Parse the KVM version from the --help output.
1532 @param text: output of kvm --help
1533 @return: (version, v_maj, v_min, v_rev)
1534 @raise L{errors.HypervisorError}: when the KVM version cannot be retrieved
1537 match = cls._VERSION_RE.search(text.splitlines()[0])
1539 raise errors.HypervisorError("Unable to get KVM version")
1541 v_all = match.group(0)
1542 v_maj = int(match.group(1))
1543 v_min = int(match.group(2))
1545 v_rev = int(match.group(4))
1548 return (v_all, v_maj, v_min, v_rev)
1551 def _GetKVMVersion(cls):
1552 """Return the installed KVM version.
1554 @return: (version, v_maj, v_min, v_rev)
1555 @raise L{errors.HypervisorError}: when the KVM version cannot be retrieved
1558 result = utils.RunCmd([constants.KVM_PATH, "--help"])
1560 raise errors.HypervisorError("Unable to get KVM version")
1561 return cls._ParseKVMVersion(result.output)
1563 def StopInstance(self, instance, force=False, retry=False, name=None):
1564 """Stop an instance.
1567 if name is not None and not force:
1568 raise errors.HypervisorError("Cannot shutdown cleanly by name only")
1570 name = instance.name
1571 acpi = instance.hvparams[constants.HV_ACPI]
1574 _, pid, alive = self._InstancePidAlive(name)
1575 if pid > 0 and alive:
1576 if force or not acpi:
1577 utils.KillProcess(pid)
1579 self._CallMonitorCommand(name, "system_powerdown")
1581 def CleanupInstance(self, instance_name):
1582 """Cleanup after a stopped instance
1585 pidfile, pid, alive = self._InstancePidAlive(instance_name)
1586 if pid > 0 and alive:
1587 raise errors.HypervisorError("Cannot cleanup a live instance")
1588 self._RemoveInstanceRuntimeFiles(pidfile, instance_name)
1590 def RebootInstance(self, instance):
1591 """Reboot an instance.
1594 # For some reason if we do a 'send-key ctrl-alt-delete' to the control
1595 # socket the instance will stop, but now power up again. So we'll resort
1596 # to shutdown and restart.
1597 _, _, alive = self._InstancePidAlive(instance.name)
1599 raise errors.HypervisorError("Failed to reboot instance %s:"
1600 " not running" % instance.name)
1601 # StopInstance will delete the saved KVM runtime so:
1602 # ...first load it...
1603 kvm_runtime = self._LoadKVMRuntime(instance)
1604 # ...now we can safely call StopInstance...
1605 if not self.StopInstance(instance):
1606 self.StopInstance(instance, force=True)
1607 # ...and finally we can save it again, and execute it...
1608 self._SaveKVMRuntime(instance, kvm_runtime)
1609 self._ExecuteKVMRuntime(instance, kvm_runtime)
1611 def MigrationInfo(self, instance):
1612 """Get instance information to perform a migration.
1614 @type instance: L{objects.Instance}
1615 @param instance: instance to be migrated
1617 @return: content of the KVM runtime file
1620 return self._ReadKVMRuntime(instance.name)
1622 def AcceptInstance(self, instance, info, target):
1623 """Prepare to accept an instance.
1625 @type instance: L{objects.Instance}
1626 @param instance: instance to be accepted
1628 @param info: content of the KVM runtime file on the source node
1629 @type target: string
1630 @param target: target host (usually ip), on this node
1633 kvm_runtime = self._LoadKVMRuntime(instance, serialized_runtime=info)
1634 incoming_address = (target, instance.hvparams[constants.HV_MIGRATION_PORT])
1635 self._ExecuteKVMRuntime(instance, kvm_runtime, incoming=incoming_address)
1637 def FinalizeMigrationDst(self, instance, info, success):
1638 """Finalize the instance migration on the target node.
1640 Stop the incoming mode KVM.
1642 @type instance: L{objects.Instance}
1643 @param instance: instance whose migration is being finalized
1647 kvm_runtime = self._LoadKVMRuntime(instance, serialized_runtime=info)
1648 kvm_nics = kvm_runtime[1]
1650 for nic_seq, nic in enumerate(kvm_nics):
1651 if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
1652 # Bridged interfaces have already been configured
1655 tap = utils.ReadFile(self._InstanceNICFile(instance.name, nic_seq))
1656 except EnvironmentError, err:
1657 logging.warning("Failed to find host interface for %s NIC #%d: %s",
1658 instance.name, nic_seq, str(err))
1661 self._ConfigureNIC(instance, nic_seq, nic, tap)
1662 except errors.HypervisorError, err:
1663 logging.warning(str(err))
1665 self._WriteKVMRuntime(instance.name, info)
1667 self.StopInstance(instance, force=True)
1669 def MigrateInstance(self, instance, target, live):
1670 """Migrate an instance to a target node.
1672 The migration will not be attempted if the instance is not
1675 @type instance: L{objects.Instance}
1676 @param instance: the instance to be migrated
1677 @type target: string
1678 @param target: ip address of the target node
1680 @param live: perform a live migration
1683 instance_name = instance.name
1684 port = instance.hvparams[constants.HV_MIGRATION_PORT]
1685 _, _, alive = self._InstancePidAlive(instance_name)
1687 raise errors.HypervisorError("Instance not running, cannot migrate")
1690 self._CallMonitorCommand(instance_name, "stop")
1692 migrate_command = ("migrate_set_speed %dm" %
1693 instance.hvparams[constants.HV_MIGRATION_BANDWIDTH])
1694 self._CallMonitorCommand(instance_name, migrate_command)
1696 migrate_command = ("migrate_set_downtime %dms" %
1697 instance.hvparams[constants.HV_MIGRATION_DOWNTIME])
1698 self._CallMonitorCommand(instance_name, migrate_command)
1700 migrate_command = "migrate -d tcp:%s:%s" % (target, port)
1701 self._CallMonitorCommand(instance_name, migrate_command)
1703 def FinalizeMigrationSource(self, instance, success, live):
1704 """Finalize the instance migration on the source node.
1706 @type instance: L{objects.Instance}
1707 @param instance: the instance that was migrated
1709 @param success: whether the migration succeeded or not
1711 @param live: whether the user requested a live migration or not
1715 pidfile, pid, _ = self._InstancePidAlive(instance.name)
1716 utils.KillProcess(pid)
1717 self._RemoveInstanceRuntimeFiles(pidfile, instance.name)
1719 self._CallMonitorCommand(instance.name, self._CONT_CMD)
1721 def GetMigrationStatus(self, instance):
1722 """Get the migration status
1724 @type instance: L{objects.Instance}
1725 @param instance: the instance that is being migrated
1726 @rtype: L{objects.MigrationStatus}
1727 @return: the status of the current migration (one of
1728 L{constants.HV_MIGRATION_VALID_STATUSES}), plus any additional
1729 progress info that can be retrieved from the hypervisor
1732 info_command = "info migrate"
1733 for _ in range(self._MIGRATION_INFO_MAX_BAD_ANSWERS):
1734 result = self._CallMonitorCommand(instance.name, info_command)
1735 match = self._MIGRATION_STATUS_RE.search(result.stdout)
1737 if not result.stdout:
1738 logging.info("KVM: empty 'info migrate' result")
1740 logging.warning("KVM: unknown 'info migrate' result: %s",
1743 status = match.group(1)
1744 if status in constants.HV_KVM_MIGRATION_VALID_STATUSES:
1745 migration_status = objects.MigrationStatus(status=status)
1746 match = self._MIGRATION_PROGRESS_RE.search(result.stdout)
1748 migration_status.transferred_ram = match.group("transferred")
1749 migration_status.total_ram = match.group("total")
1751 return migration_status
1753 logging.warning("KVM: unknown migration status '%s'", status)
1755 time.sleep(self._MIGRATION_INFO_RETRY_DELAY)
1757 return objects.MigrationStatus(status=constants.HV_MIGRATION_FAILED,
1758 info="Too many 'info migrate' broken answers")
1760 def BalloonInstanceMemory(self, instance, mem):
1761 """Balloon an instance memory to a certain value.
1763 @type instance: L{objects.Instance}
1764 @param instance: instance to be accepted
1766 @param mem: actual memory size to use for instance runtime
1769 self._CallMonitorCommand(instance.name, "balloon %d" % mem)
1771 def GetNodeInfo(self):
1772 """Return information about the node.
1774 @return: a dict with the following keys (values in MiB):
1775 - memory_total: the total memory size on the node
1776 - memory_free: the available memory on the node for instances
1777 - memory_dom0: the memory used by the node itself, if available
1778 - hv_version: the hypervisor version in the form (major, minor,
1782 result = self.GetLinuxNodeInfo()
1783 _, v_major, v_min, v_rev = self._GetKVMVersion()
1784 result[constants.HV_NODEINFO_KEY_VERSION] = (v_major, v_min, v_rev)
1788 def GetInstanceConsole(cls, instance, hvparams, beparams):
1789 """Return a command for connecting to the console of an instance.
1792 if hvparams[constants.HV_SERIAL_CONSOLE]:
1793 cmd = [constants.KVM_CONSOLE_WRAPPER,
1794 constants.SOCAT_PATH, utils.ShellQuote(instance.name),
1795 utils.ShellQuote(cls._InstanceMonitor(instance.name)),
1796 "STDIO,%s" % cls._SocatUnixConsoleParams(),
1797 "UNIX-CONNECT:%s" % cls._InstanceSerial(instance.name)]
1798 return objects.InstanceConsole(instance=instance.name,
1799 kind=constants.CONS_SSH,
1800 host=instance.primary_node,
1801 user=constants.GANETI_RUNAS,
1804 vnc_bind_address = hvparams[constants.HV_VNC_BIND_ADDRESS]
1805 if vnc_bind_address and instance.network_port > constants.VNC_BASE_PORT:
1806 display = instance.network_port - constants.VNC_BASE_PORT
1807 return objects.InstanceConsole(instance=instance.name,
1808 kind=constants.CONS_VNC,
1809 host=vnc_bind_address,
1810 port=instance.network_port,
1813 spice_bind = hvparams[constants.HV_KVM_SPICE_BIND]
1815 return objects.InstanceConsole(instance=instance.name,
1816 kind=constants.CONS_SPICE,
1818 port=instance.network_port)
1820 return objects.InstanceConsole(instance=instance.name,
1821 kind=constants.CONS_MESSAGE,
1822 message=("No serial shell for instance %s" %
1826 """Verify the hypervisor.
1828 Check that the binary exists.
1831 if not os.path.exists(constants.KVM_PATH):
1832 return "The kvm binary ('%s') does not exist." % constants.KVM_PATH
1833 if not os.path.exists(constants.SOCAT_PATH):
1834 return "The socat binary ('%s') does not exist." % constants.SOCAT_PATH
1837 def CheckParameterSyntax(cls, hvparams):
1838 """Check the given parameters for validity.
1840 @type hvparams: dict
1841 @param hvparams: dictionary with parameter names/value
1842 @raise errors.HypervisorError: when a parameter is not valid
1845 super(KVMHypervisor, cls).CheckParameterSyntax(hvparams)
1847 kernel_path = hvparams[constants.HV_KERNEL_PATH]
1849 if not hvparams[constants.HV_ROOT_PATH]:
1850 raise errors.HypervisorError("Need a root partition for the instance,"
1851 " if a kernel is defined")
1853 if (hvparams[constants.HV_VNC_X509_VERIFY] and
1854 not hvparams[constants.HV_VNC_X509]):
1855 raise errors.HypervisorError("%s must be defined, if %s is" %
1856 (constants.HV_VNC_X509,
1857 constants.HV_VNC_X509_VERIFY))
1859 boot_order = hvparams[constants.HV_BOOT_ORDER]
1860 if (boot_order == constants.HT_BO_CDROM and
1861 not hvparams[constants.HV_CDROM_IMAGE_PATH]):
1862 raise errors.HypervisorError("Cannot boot from cdrom without an"
1865 security_model = hvparams[constants.HV_SECURITY_MODEL]
1866 if security_model == constants.HT_SM_USER:
1867 if not hvparams[constants.HV_SECURITY_DOMAIN]:
1868 raise errors.HypervisorError("A security domain (user to run kvm as)"
1869 " must be specified")
1870 elif (security_model == constants.HT_SM_NONE or
1871 security_model == constants.HT_SM_POOL):
1872 if hvparams[constants.HV_SECURITY_DOMAIN]:
1873 raise errors.HypervisorError("Cannot have a security domain when the"
1874 " security model is 'none' or 'pool'")
1876 spice_bind = hvparams[constants.HV_KVM_SPICE_BIND]
1877 spice_ip_version = hvparams[constants.HV_KVM_SPICE_IP_VERSION]
1879 if spice_ip_version != constants.IFACE_NO_IP_VERSION_SPECIFIED:
1880 # if an IP version is specified, the spice_bind parameter must be an
1882 if (netutils.IP4Address.IsValid(spice_bind) and
1883 spice_ip_version != constants.IP4_VERSION):
1884 raise errors.HypervisorError("spice: got an IPv4 address (%s), but"
1885 " the specified IP version is %s" %
1886 (spice_bind, spice_ip_version))
1888 if (netutils.IP6Address.IsValid(spice_bind) and
1889 spice_ip_version != constants.IP6_VERSION):
1890 raise errors.HypervisorError("spice: got an IPv6 address (%s), but"
1891 " the specified IP version is %s" %
1892 (spice_bind, spice_ip_version))
1894 # All the other SPICE parameters depend on spice_bind being set. Raise an
1895 # error if any of them is set without it.
1896 spice_additional_params = frozenset([
1897 constants.HV_KVM_SPICE_IP_VERSION,
1898 constants.HV_KVM_SPICE_PASSWORD_FILE,
1899 constants.HV_KVM_SPICE_LOSSLESS_IMG_COMPR,
1900 constants.HV_KVM_SPICE_JPEG_IMG_COMPR,
1901 constants.HV_KVM_SPICE_ZLIB_GLZ_IMG_COMPR,
1902 constants.HV_KVM_SPICE_STREAMING_VIDEO_DETECTION,
1903 constants.HV_KVM_SPICE_USE_TLS,
1905 for param in spice_additional_params:
1907 raise errors.HypervisorError("spice: %s requires %s to be set" %
1908 (param, constants.HV_KVM_SPICE_BIND))
1911 def ValidateParameters(cls, hvparams):
1912 """Check the given parameters for validity.
1914 @type hvparams: dict
1915 @param hvparams: dictionary with parameter names/value
1916 @raise errors.HypervisorError: when a parameter is not valid
1919 super(KVMHypervisor, cls).ValidateParameters(hvparams)
1921 security_model = hvparams[constants.HV_SECURITY_MODEL]
1922 if security_model == constants.HT_SM_USER:
1923 username = hvparams[constants.HV_SECURITY_DOMAIN]
1925 pwd.getpwnam(username)
1927 raise errors.HypervisorError("Unknown security domain user %s"
1930 spice_bind = hvparams[constants.HV_KVM_SPICE_BIND]
1932 # only one of VNC and SPICE can be used currently.
1933 if hvparams[constants.HV_VNC_BIND_ADDRESS]:
1934 raise errors.HypervisorError("both SPICE and VNC are configured, but"
1935 " only one of them can be used at a"
1938 # KVM version should be >= 0.14.0
1939 _, v_major, v_min, _ = cls._GetKVMVersion()
1940 if (v_major, v_min) < (0, 14):
1941 raise errors.HypervisorError("spice is configured, but it is not"
1942 " available in versions of KVM < 0.14")
1944 # if spice_bind is not an IP address, it must be a valid interface
1945 bound_to_addr = (netutils.IP4Address.IsValid(spice_bind)
1946 or netutils.IP6Address.IsValid(spice_bind))
1947 if not bound_to_addr and not netutils.IsValidInterface(spice_bind):
1948 raise errors.HypervisorError("spice: the %s parameter must be either"
1949 " a valid IP address or interface name" %
1950 constants.HV_KVM_SPICE_BIND)
1953 def PowercycleNode(cls):
1954 """KVM powercycle, just a wrapper over Linux powercycle.
1957 cls.LinuxPowercycle()