hv_xen.py 19.2 KB
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#
#

# Copyright (C) 2006, 2007, 2008 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


"""Xen hypervisors

"""

import os
import os.path
import time
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import logging
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from cStringIO import StringIO

from ganeti import constants
from ganeti import errors
from ganeti import utils
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from ganeti.hypervisor import hv_base
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class XenHypervisor(hv_base.BaseHypervisor):
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  """Xen generic hypervisor interface

  This is the Xen base class used for both Xen PVM and HVM. It contains
  all the functionality that is identical for both.

  """

  @staticmethod
  def _WriteConfigFile(instance, block_devices, extra_args):
    """Write the Xen config file for the instance.

    """
    raise NotImplementedError

  @staticmethod
  def _RemoveConfigFile(instance):
    """Remove the xen configuration file.

    """
    utils.RemoveFile("/etc/xen/%s" % instance.name)

  @staticmethod
  def _GetXMList(include_node):
    """Return the list of running instances.

    If the `include_node` argument is True, then we return information
    for dom0 also, otherwise we filter that from the return value.

    The return value is a list of (name, id, memory, vcpus, state, time spent)

    """
    for dummy in range(5):
      result = utils.RunCmd(["xm", "list"])
      if not result.failed:
        break
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      logging.error("xm list failed (%s): %s", result.fail_reason,
                    result.output)
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      time.sleep(1)

    if result.failed:
      raise errors.HypervisorError("xm list failed, retries"
                                   " exceeded (%s): %s" %
                                   (result.fail_reason, result.stderr))

    # skip over the heading
    lines = result.stdout.splitlines()[1:]
    result = []
    for line in lines:
      # The format of lines is:
      # Name      ID Mem(MiB) VCPUs State  Time(s)
      # Domain-0   0  3418     4 r-----    266.2
      data = line.split()
      if len(data) != 6:
        raise errors.HypervisorError("Can't parse output of xm list,"
                                     " line: %s" % line)
      try:
        data[1] = int(data[1])
        data[2] = int(data[2])
        data[3] = int(data[3])
        data[5] = float(data[5])
      except ValueError, err:
        raise errors.HypervisorError("Can't parse output of xm list,"
                                     " line: %s, error: %s" % (line, err))

      # skip the Domain-0 (optional)
      if include_node or data[0] != 'Domain-0':
        result.append(data)

    return result

  def ListInstances(self):
    """Get the list of running instances.

    """
    xm_list = self._GetXMList(False)
    names = [info[0] for info in xm_list]
    return names

  def GetInstanceInfo(self, instance_name):
    """Get instance properties.

    Args:
      instance_name: the instance name

    Returns:
      (name, id, memory, vcpus, stat, times)
    """
    xm_list = self._GetXMList(instance_name=="Domain-0")
    result = None
    for data in xm_list:
      if data[0] == instance_name:
        result = data
        break
    return result

  def GetAllInstancesInfo(self):
    """Get properties of all instances.

    Returns:
      [(name, id, memory, vcpus, stat, times),...]
    """
    xm_list = self._GetXMList(False)
    return xm_list

  def StartInstance(self, instance, block_devices, extra_args):
    """Start an instance."""
    self._WriteConfigFile(instance, block_devices, extra_args)
    result = utils.RunCmd(["xm", "create", instance.name])

    if result.failed:
      raise errors.HypervisorError("Failed to start instance %s: %s (%s)" %
                                   (instance.name, result.fail_reason,
                                    result.output))

  def StopInstance(self, instance, force=False):
    """Stop an instance."""
    self._RemoveConfigFile(instance)
    if force:
      command = ["xm", "destroy", instance.name]
    else:
      command = ["xm", "shutdown", instance.name]
    result = utils.RunCmd(command)

    if result.failed:
      raise errors.HypervisorError("Failed to stop instance %s: %s" %
                                   (instance.name, result.fail_reason))

  def RebootInstance(self, instance):
    """Reboot an instance."""
    result = utils.RunCmd(["xm", "reboot", instance.name])

    if result.failed:
      raise errors.HypervisorError("Failed to reboot instance %s: %s" %
                                   (instance.name, result.fail_reason))

  def GetNodeInfo(self):
    """Return information about the node.

    The return value is a dict, which has to have the following items:
      (all values in MiB)
      - memory_total: the total memory size on the node
      - memory_free: the available memory on the node for instances
      - memory_dom0: the memory used by the node itself, if available

    """
    # note: in xen 3, memory has changed to total_memory
    result = utils.RunCmd(["xm", "info"])
    if result.failed:
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      logging.error("Can't run 'xm info' (%s): %s", result.fail_reason,
                    result.output)
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      return None

    xmoutput = result.stdout.splitlines()
    result = {}
    for line in xmoutput:
      splitfields = line.split(":", 1)

      if len(splitfields) > 1:
        key = splitfields[0].strip()
        val = splitfields[1].strip()
        if key == 'memory' or key == 'total_memory':
          result['memory_total'] = int(val)
        elif key == 'free_memory':
          result['memory_free'] = int(val)
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        elif key == 'nr_cpus':
          result['cpu_total'] = int(val)
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    dom0_info = self.GetInstanceInfo("Domain-0")
    if dom0_info is not None:
      result['memory_dom0'] = dom0_info[2]

    return result

  @staticmethod
  def GetShellCommandForConsole(instance):
    """Return a command for connecting to the console of an instance.

    """
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    return "xm console %s" % instance.name

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  def Verify(self):
    """Verify the hypervisor.

    For Xen, this verifies that the xend process is running.

    """
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    result = utils.RunCmd(["xm", "info"])
    if result.failed:
      return "'xm info' failed: %s" % result.fail_reason
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  @staticmethod
  def _GetConfigFileDiskData(disk_template, block_devices):
    """Get disk directive for xen config file.

    This method builds the xen config disk directive according to the
    given disk_template and block_devices.

    Args:
      disk_template: String containing instance disk template
      block_devices: List[tuple1,tuple2,...]
        tuple: (cfdev, rldev)
          cfdev: dict containing ganeti config disk part
          rldev: ganeti.bdev.BlockDev object

    Returns:
      String containing disk directive for xen instance config file

    """
    FILE_DRIVER_MAP = {
      constants.FD_LOOP: "file",
      constants.FD_BLKTAP: "tap:aio",
      }
    disk_data = []
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    if len(block_devices) > 24:
      # 'z' - 'a' = 24
      raise errors.HypervisorError("Too many disks")
    # FIXME: instead of this hardcoding here, each of PVM/HVM should
    # directly export their info (currently HVM will just sed this info)
    namespace = ["sd" + chr(i + ord('a')) for i in range(24)]
    for sd_name, (cfdev, rldev) in zip(namespace, block_devices):
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      if cfdev.dev_type == constants.LD_FILE:
        line = "'%s:%s,%s,w'" % (FILE_DRIVER_MAP[cfdev.physical_id[0]],
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                                 rldev.dev_path, sd_name)
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      else:
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        line = "'phy:%s,%s,w'" % (rldev.dev_path, sd_name)
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      disk_data.append(line)

    return disk_data

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  def MigrateInstance(self, instance, target, live):
    """Migrate an instance to a target node.

    Arguments:
      - instance: the name of the instance
      - target: the ip of the target node
      - live: whether to do live migration or not

    Returns: none, errors will be signaled by exception.

    The migration will not be attempted if the instance is not
    currently running.

    """
    if self.GetInstanceInfo(instance) is None:
      raise errors.HypervisorError("Instance not running, cannot migrate")
    args = ["xm", "migrate"]
    if live:
      args.append("-l")
    args.extend([instance, target])
    result = utils.RunCmd(args)
    if result.failed:
      raise errors.HypervisorError("Failed to migrate instance %s: %s" %
                                   (instance, result.output))

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class XenPvmHypervisor(XenHypervisor):
  """Xen PVM hypervisor interface"""

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  PARAMETERS = [
    constants.HV_KERNEL_PATH,
    constants.HV_INITRD_PATH,
    ]

  @classmethod
  def CheckParameterSyntax(cls, hvparams):
    """Check the given parameters for validity.

    For the PVM hypervisor, this only check the existence of the
    kernel.

    @type hvparams:  dict
    @param hvparams: dictionary with parameter names/value
    @raise errors.HypervisorError: when a parameter is not valid

    """
    super(XenPvmHypervisor, cls).CheckParameterSyntax(hvparams)

    if not hvparams[constants.HV_KERNEL_PATH]:
      raise errors.HypervisorError("Need a kernel for the instance")

    if not os.path.isabs(hvparams[constants.HV_KERNEL_PATH]):
      raise errors.HypervisorError("The kernel path must an absolute path")

    if hvparams[constants.HV_INITRD_PATH]:
      if not os.path.isabs(hvparams[constants.HV_INITRD_PATH]):
        raise errors.HypervisorError("The initrd path must an absolute path"
                                     ", if defined")

  def ValidateParameters(self, hvparams):
    """Check the given parameters for validity.

    For the PVM hypervisor, this only check the existence of the
    kernel.

    """
    super(XenPvmHypervisor, self).ValidateParameters(hvparams)

    kernel_path = hvparams[constants.HV_KERNEL_PATH]
    if not os.path.isfile(kernel_path):
      raise errors.HypervisorError("Instance kernel '%s' not found or"
                                   " not a file" % kernel_path)
    initrd_path = hvparams[constants.HV_INITRD_PATH]
    if initrd_path and not os.path.isfile(initrd_path):
      raise errors.HypervisorError("Instance initrd '%s' not found or"
                                   " not a file" % initrd_path)

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  @classmethod
  def _WriteConfigFile(cls, instance, block_devices, extra_args):
    """Write the Xen config file for the instance.

    """
    config = StringIO()
    config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")

    # kernel handling
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    kpath = instance.hvparams[constants.HV_KERNEL_PATH]
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    config.write("kernel = '%s'\n" % kpath)

    # initrd handling
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    initrd_path = instance.hvparams[constants.HV_INITRD_PATH]
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    if initrd_path:
      config.write("ramdisk = '%s'\n" % initrd_path)

    # rest of the settings
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    config.write("memory = %d\n" % instance.beparams[constants.BE_MEMORY])
    config.write("vcpus = %d\n" % instance.beparams[constants.BE_VCPUS])
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    config.write("name = '%s'\n" % instance.name)

    vif_data = []
    for nic in instance.nics:
      nic_str = "mac=%s, bridge=%s" % (nic.mac, nic.bridge)
      ip = getattr(nic, "ip", None)
      if ip is not None:
        nic_str += ", ip=%s" % ip
      vif_data.append("'%s'" % nic_str)

    config.write("vif = [%s]\n" % ",".join(vif_data))
    config.write("disk = [%s]\n" % ",".join(
                 cls._GetConfigFileDiskData(instance.disk_template,
                                            block_devices)))
    config.write("root = '/dev/sda ro'\n")
    config.write("on_poweroff = 'destroy'\n")
    config.write("on_reboot = 'restart'\n")
    config.write("on_crash = 'restart'\n")
    if extra_args:
      config.write("extra = '%s'\n" % extra_args)
    # just in case it exists
    utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
    try:
      f = open("/etc/xen/%s" % instance.name, "w")
      try:
        f.write(config.getvalue())
      finally:
        f.close()
    except IOError, err:
      raise errors.OpExecError("Cannot write Xen instance confile"
                               " file /etc/xen/%s: %s" % (instance.name, err))
    return True


class XenHvmHypervisor(XenHypervisor):
  """Xen HVM hypervisor interface"""

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  PARAMETERS = [
    constants.HV_ACPI,
    constants.HV_BOOT_ORDER,
    constants.HV_CDROM_IMAGE_PATH,
    constants.HV_DISK_TYPE,
    constants.HV_NIC_TYPE,
    constants.HV_PAE,
    constants.HV_VNC_BIND_ADDRESS,
    ]

  @classmethod
  def CheckParameterSyntax(cls, hvparams):
    """Check the given parameter syntax.

    """
    super(XenHvmHypervisor, cls).CheckParameterSyntax(hvparams)
    # boot order verification
    boot_order = hvparams[constants.HV_BOOT_ORDER]
    if len(boot_order.strip("acdn")) != 0:
      raise errors.HypervisorError("Invalid boot order '%s' specified,"
                                   " must be one or more of [acdn]" %
                                   boot_order)
    # device type checks
    nic_type = hvparams[constants.HV_NIC_TYPE]
    if nic_type not in constants.HT_HVM_VALID_NIC_TYPES:
      raise errors.HypervisorError("Invalid NIC type %s specified for Xen HVM"
                                   " hypervisor" % nic_type)
    disk_type = hvparams[constants.HV_DISK_TYPE]
    if disk_type not in constants.HT_HVM_VALID_DISK_TYPES:
      raise errors.HypervisorError("Invalid disk type %s specified for Xen HVM"
                                   " hypervisor" % disk_type)
    # vnc_bind_address verification
    vnc_bind_address = hvparams[constants.HV_VNC_BIND_ADDRESS]
    if vnc_bind_address is not None:
      if not utils.IsValidIP(vnc_bind_address):
        raise errors.OpPrereqError("given VNC bind address '%s' doesn't look"
                                   " like a valid IP address" %
                                   vnc_bind_address)

    iso_path = hvparams[constants.HV_CDROM_IMAGE_PATH]
    if iso_path and not os.path.isabs(iso_path):
        raise errors.HypervisorError("The path to the HVM CDROM image must"
                                     " be an absolute path or None, not %s" %
                                     iso_path)

  def ValidateParameters(self, hvparams):
    """Check the given parameters for validity.

    For the PVM hypervisor, this only check the existence of the
    kernel.

    @type hvparams:  dict
    @param hvparams: dictionary with parameter names/value
    @raise errors.HypervisorError: when a parameter is not valid

    """
    super(XenHvmHypervisor, self).ValidateParameters(hvparams)

    # hvm_cdrom_image_path verification
    iso_path = hvparams[constants.HV_CDROM_IMAGE_PATH]
    if iso_path and not os.path.isfile(iso_path):
        raise errors.HypervisorError("The HVM CDROM image must either be a"
                                     " regular file or a symlink pointing to"
                                     " an existing regular file, not %s" %
                                     iso_path)

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  @classmethod
  def _WriteConfigFile(cls, instance, block_devices, extra_args):
    """Create a Xen 3.1 HVM config file.

    """
    config = StringIO()
    config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
    config.write("kernel = '/usr/lib/xen/boot/hvmloader'\n")
    config.write("builder = 'hvm'\n")
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    config.write("memory = %d\n" % instance.beparams[constants.BE_MEMORY])
    config.write("vcpus = %d\n" % instance.beparams[constants.BE_VCPUS])
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    config.write("name = '%s'\n" % instance.name)
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    if instance.hvparams[constants.HV_PAE]:
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      config.write("pae = 1\n")
    else:
      config.write("pae = 0\n")
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    if instance.hvparams[constants.HV_ACPI]:
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      config.write("acpi = 1\n")
    else:
      config.write("acpi = 0\n")
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    config.write("apic = 1\n")
    arch = os.uname()[4]
    if '64' in arch:
      config.write("device_model = '/usr/lib64/xen/bin/qemu-dm'\n")
    else:
      config.write("device_model = '/usr/lib/xen/bin/qemu-dm'\n")
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    if instance.hvparams[constants.HV_BOOT_ORDER] is None:
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      config.write("boot = '%s'\n" % constants.HT_HVM_DEFAULT_BOOT_ORDER)
    else:
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      config.write("boot = '%s'\n" % instance.hvparams["boot_order"])
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    config.write("sdl = 0\n")
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    config.write("usb = 1\n")
    config.write("usbdevice = 'tablet'\n")
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    config.write("vnc = 1\n")
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    if instance.hvparams[constants.HV_VNC_BIND_ADDRESS] is None:
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      config.write("vnclisten = '%s'\n" % constants.VNC_DEFAULT_BIND_ADDRESS)
    else:
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      config.write("vnclisten = '%s'\n" %
                   instance.hvparams["vnc_bind_address"])
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    if instance.network_port > constants.HT_HVM_VNC_BASE_PORT:
      display = instance.network_port - constants.HT_HVM_VNC_BASE_PORT
      config.write("vncdisplay = %s\n" % display)
      config.write("vncunused = 0\n")
    else:
      config.write("# vncdisplay = 1\n")
      config.write("vncunused = 1\n")

    try:
      password_file = open(constants.VNC_PASSWORD_FILE, "r")
      try:
        password = password_file.readline()
      finally:
        password_file.close()
    except IOError:
      raise errors.OpExecError("failed to open VNC password file %s " %
                               constants.VNC_PASSWORD_FILE)

    config.write("vncpasswd = '%s'\n" % password.rstrip())

    config.write("serial = 'pty'\n")
    config.write("localtime = 1\n")

    vif_data = []
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    nic_type = instance.hvparams[constants.HV_NIC_TYPE]
    if nic_type is None:
      # ensure old instances don't change
      nic_type_str = ", type=ioemu"
    elif nic_type == constants.HT_HVM_DEV_PARAVIRTUAL:
      nic_type_str = ", type=paravirtualized"
    else:
      nic_type_str = ", model=%s, type=ioemu" % nic_type
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    for nic in instance.nics:
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      nic_str = "mac=%s, bridge=%s%s" % (nic.mac, nic.bridge, nic_type_str)
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      ip = getattr(nic, "ip", None)
      if ip is not None:
        nic_str += ", ip=%s" % ip
      vif_data.append("'%s'" % nic_str)

    config.write("vif = [%s]\n" % ",".join(vif_data))
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    disk_data = cls._GetConfigFileDiskData(instance.disk_template,
                                            block_devices)
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    disk_type = instance.hvparams[constants.HV_DISK_TYPE]
    if disk_type in (None, constants.HT_HVM_DEV_IOEMU):
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      replacement = ",ioemu:hd"
    else:
      replacement = ",hd"
    disk_data = [line.replace(",sd", replacement) for line in disk_data]
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    iso_path = instance.hvparams[constants.HV_CDROM_IMAGE_PATH]
    if iso_path:
      iso = "'file:%s,hdc:cdrom,r'" % iso_path
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      disk_data.append(iso)

    config.write("disk = [%s]\n" % (",".join(disk_data)))

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    config.write("on_poweroff = 'destroy'\n")
    config.write("on_reboot = 'restart'\n")
    config.write("on_crash = 'restart'\n")
    if extra_args:
      config.write("extra = '%s'\n" % extra_args)
    # just in case it exists
    utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
    try:
      f = open("/etc/xen/%s" % instance.name, "w")
      try:
        f.write(config.getvalue())
      finally:
        f.close()
    except IOError, err:
      raise errors.OpExecError("Cannot write Xen instance confile"
                               " file /etc/xen/%s: %s" % (instance.name, err))
    return True