root / lib / hypervisor / hv_xen.py @ dafc7302
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# Copyright (C) 2006, 2007, 2008 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Xen hypervisors
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"""
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import os |
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import os.path |
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import time |
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import logging |
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from cStringIO import StringIO |
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from ganeti import constants |
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from ganeti import errors |
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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
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This is the Xen base class used for both Xen PVM and HVM. It contains
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all the functionality that is identical for both.
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"""
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@staticmethod
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def _WriteConfigFile(instance, block_devices, extra_args): |
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"""Write the Xen config file for the instance.
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"""
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raise NotImplementedError |
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@staticmethod
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def _RemoveConfigFile(instance): |
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"""Remove the xen configuration file.
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"""
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utils.RemoveFile("/etc/xen/%s" % instance.name)
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@staticmethod
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def _GetXMList(include_node): |
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"""Return the list of running instances.
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If the `include_node` argument is True, then we return information
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for dom0 also, otherwise we filter that from the return value.
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The return value is a list of (name, id, memory, vcpus, state, time spent)
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"""
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for dummy in range(5): |
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result = utils.RunCmd(["xm", "list"]) |
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if not result.failed: |
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break
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logging.error("xm list failed (%s): %s", result.fail_reason,
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result.output) |
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time.sleep(1)
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if result.failed:
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raise errors.HypervisorError("xm list failed, retries" |
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" exceeded (%s): %s" %
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(result.fail_reason, result.stderr)) |
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# skip over the heading
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lines = result.stdout.splitlines()[1:]
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result = [] |
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for line in lines: |
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# The format of lines is:
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# Name ID Mem(MiB) VCPUs State Time(s)
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# Domain-0 0 3418 4 r----- 266.2
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data = line.split() |
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if len(data) != 6: |
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raise errors.HypervisorError("Can't parse output of xm list," |
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" line: %s" % line)
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try:
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data[1] = int(data[1]) |
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data[2] = int(data[2]) |
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data[3] = int(data[3]) |
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data[5] = float(data[5]) |
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except ValueError, err: |
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raise errors.HypervisorError("Can't parse output of xm list," |
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" line: %s, error: %s" % (line, err))
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# skip the Domain-0 (optional)
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if include_node or data[0] != 'Domain-0': |
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result.append(data) |
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return result
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def ListInstances(self): |
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"""Get the list of running instances.
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"""
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xm_list = self._GetXMList(False) |
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names = [info[0] for info in xm_list] |
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return names
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def GetInstanceInfo(self, instance_name): |
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"""Get instance properties.
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Args:
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instance_name: the instance name
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Returns:
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(name, id, memory, vcpus, stat, times)
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"""
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xm_list = self._GetXMList(instance_name=="Domain-0") |
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result = None
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for data in xm_list: |
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if data[0] == instance_name: |
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result = data |
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break
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return result
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def GetAllInstancesInfo(self): |
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"""Get properties of all instances.
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Returns:
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[(name, id, memory, vcpus, stat, times),...]
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"""
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xm_list = self._GetXMList(False) |
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return xm_list
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def StartInstance(self, instance, block_devices, extra_args): |
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"""Start an instance."""
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self._WriteConfigFile(instance, block_devices, extra_args)
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result = utils.RunCmd(["xm", "create", instance.name]) |
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if result.failed:
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raise errors.HypervisorError("Failed to start instance %s: %s (%s)" % |
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(instance.name, result.fail_reason, |
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result.output)) |
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def StopInstance(self, instance, force=False): |
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"""Stop an instance."""
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self._RemoveConfigFile(instance)
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if force:
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command = ["xm", "destroy", instance.name] |
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else:
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command = ["xm", "shutdown", instance.name] |
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result = utils.RunCmd(command) |
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if result.failed:
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raise errors.HypervisorError("Failed to stop instance %s: %s" % |
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(instance.name, result.fail_reason)) |
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def RebootInstance(self, instance): |
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"""Reboot an instance."""
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result = utils.RunCmd(["xm", "reboot", instance.name]) |
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if result.failed:
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raise errors.HypervisorError("Failed to reboot instance %s: %s" % |
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(instance.name, result.fail_reason)) |
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def GetNodeInfo(self): |
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"""Return information about the node.
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The return value is a dict, which has to have the following items:
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(all values in MiB)
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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# note: in xen 3, memory has changed to total_memory
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result = utils.RunCmd(["xm", "info"]) |
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if result.failed:
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logging.error("Can't run 'xm info' (%s): %s", result.fail_reason,
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result.output) |
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return None |
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xmoutput = result.stdout.splitlines() |
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result = {} |
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for line in xmoutput: |
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splitfields = line.split(":", 1) |
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if len(splitfields) > 1: |
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key = splitfields[0].strip()
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val = splitfields[1].strip()
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if key == 'memory' or key == 'total_memory': |
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result['memory_total'] = int(val) |
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elif key == 'free_memory': |
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result['memory_free'] = int(val) |
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elif key == 'nr_cpus': |
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result['cpu_total'] = int(val) |
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dom0_info = self.GetInstanceInfo("Domain-0") |
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if dom0_info is not None: |
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result['memory_dom0'] = dom0_info[2] |
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return result
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@staticmethod
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def GetShellCommandForConsole(instance): |
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"""Return a command for connecting to the console of an instance.
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"""
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return "xm console %s" % instance.name |
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def Verify(self): |
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"""Verify the hypervisor.
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For Xen, this verifies that the xend process is running.
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"""
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result = utils.RunCmd(["xm", "info"]) |
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if result.failed:
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return "'xm info' failed: %s" % result.fail_reason |
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@staticmethod
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def _GetConfigFileDiskData(disk_template, block_devices): |
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"""Get disk directive for xen config file.
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This method builds the xen config disk directive according to the
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given disk_template and block_devices.
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Args:
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disk_template: String containing instance disk template
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block_devices: List[tuple1,tuple2,...]
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tuple: (cfdev, rldev)
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cfdev: dict containing ganeti config disk part
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rldev: ganeti.bdev.BlockDev object
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Returns:
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String containing disk directive for xen instance config file
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"""
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FILE_DRIVER_MAP = { |
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constants.FD_LOOP: "file",
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constants.FD_BLKTAP: "tap:aio",
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} |
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disk_data = [] |
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if len(block_devices) > 24: |
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# 'z' - 'a' = 24
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raise errors.HypervisorError("Too many disks") |
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# FIXME: instead of this hardcoding here, each of PVM/HVM should
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# directly export their info (currently HVM will just sed this info)
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namespace = ["sd" + chr(i + ord('a')) for i in range(24)] |
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for sd_name, (cfdev, rldev) in zip(namespace, block_devices): |
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if cfdev.dev_type == constants.LD_FILE:
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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) |
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return disk_data
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def MigrateInstance(self, instance, target, live): |
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"""Migrate an instance to a target node.
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Arguments:
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- instance: the name of the instance
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- target: the ip of the target node
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- live: whether to do live migration or not
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Returns: none, errors will be signaled by exception.
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The migration will not be attempted if the instance is not
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currently running.
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"""
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if self.GetInstanceInfo(instance) is None: |
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raise errors.HypervisorError("Instance not running, cannot migrate") |
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args = ["xm", "migrate"] |
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if live:
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args.append("-l")
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args.extend([instance, target]) |
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result = utils.RunCmd(args) |
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if result.failed:
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raise errors.HypervisorError("Failed to migrate instance %s: %s" % |
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(instance, result.output)) |
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class XenPvmHypervisor(XenHypervisor): |
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"""Xen PVM hypervisor interface"""
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PARAMETERS = [ |
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constants.HV_KERNEL_PATH, |
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constants.HV_INITRD_PATH, |
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] |
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@classmethod
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def CheckParameterSyntax(cls, hvparams): |
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"""Check the given parameters for validity.
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For the PVM hypervisor, this only check the existence of the
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kernel.
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@type hvparams: dict
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@param hvparams: dictionary with parameter names/value
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@raise errors.HypervisorError: when a parameter is not valid
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"""
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super(XenPvmHypervisor, cls).CheckParameterSyntax(hvparams)
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if not hvparams[constants.HV_KERNEL_PATH]: |
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raise errors.HypervisorError("Need a kernel for the instance") |
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if not os.path.isabs(hvparams[constants.HV_KERNEL_PATH]): |
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raise errors.HypervisorError("The kernel path must an absolute path") |
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if hvparams[constants.HV_INITRD_PATH]:
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if not os.path.isabs(hvparams[constants.HV_INITRD_PATH]): |
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raise errors.HypervisorError("The initrd path must an absolute path" |
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", if defined")
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def ValidateParameters(self, hvparams): |
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"""Check the given parameters for validity.
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For the PVM hypervisor, this only check the existence of the
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kernel.
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"""
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super(XenPvmHypervisor, self).ValidateParameters(hvparams) |
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kernel_path = hvparams[constants.HV_KERNEL_PATH] |
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if not os.path.isfile(kernel_path): |
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raise errors.HypervisorError("Instance kernel '%s' not found or" |
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" not a file" % kernel_path)
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initrd_path = hvparams[constants.HV_INITRD_PATH] |
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if initrd_path and not os.path.isfile(initrd_path): |
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raise errors.HypervisorError("Instance initrd '%s' not found or" |
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" not a file" % initrd_path)
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@classmethod
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def _WriteConfigFile(cls, instance, block_devices, extra_args): |
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"""Write the Xen config file for the instance.
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"""
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config = StringIO() |
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config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
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# kernel handling
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kpath = instance.hvparams[constants.HV_KERNEL_PATH] |
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config.write("kernel = '%s'\n" % kpath)
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# initrd handling
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initrd_path = instance.hvparams[constants.HV_INITRD_PATH] |
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if initrd_path:
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config.write("ramdisk = '%s'\n" % initrd_path)
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# rest of the settings
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config.write("memory = %d\n" % instance.beparams[constants.BE_MEMORY])
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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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vif_data = [] |
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for nic in instance.nics: |
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nic_str = "mac=%s, bridge=%s" % (nic.mac, nic.bridge)
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ip = getattr(nic, "ip", None) |
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if ip is not None: |
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nic_str += ", ip=%s" % ip
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vif_data.append("'%s'" % nic_str)
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config.write("vif = [%s]\n" % ",".join(vif_data)) |
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config.write("disk = [%s]\n" % ",".join( |
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cls._GetConfigFileDiskData(instance.disk_template, |
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block_devices))) |
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config.write("root = '/dev/sda ro'\n")
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config.write("on_poweroff = 'destroy'\n")
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config.write("on_reboot = 'restart'\n")
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config.write("on_crash = 'restart'\n")
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if extra_args:
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config.write("extra = '%s'\n" % extra_args)
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# just in case it exists
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utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
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try:
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f = open("/etc/xen/%s" % instance.name, "w") |
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try:
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f.write(config.getvalue()) |
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finally:
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f.close() |
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except IOError, err: |
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raise errors.OpExecError("Cannot write Xen instance confile" |
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" file /etc/xen/%s: %s" % (instance.name, err))
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return True |
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class XenHvmHypervisor(XenHypervisor): |
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"""Xen HVM hypervisor interface"""
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PARAMETERS = [ |
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constants.HV_ACPI, |
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constants.HV_BOOT_ORDER, |
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constants.HV_CDROM_IMAGE_PATH, |
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constants.HV_DISK_TYPE, |
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constants.HV_NIC_TYPE, |
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constants.HV_PAE, |
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constants.HV_VNC_BIND_ADDRESS, |
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] |
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@classmethod
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def CheckParameterSyntax(cls, hvparams): |
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"""Check the given parameter syntax.
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"""
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super(XenHvmHypervisor, cls).CheckParameterSyntax(hvparams)
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# boot order verification
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boot_order = hvparams[constants.HV_BOOT_ORDER] |
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if len(boot_order.strip("acdn")) != 0: |
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raise errors.HypervisorError("Invalid boot order '%s' specified," |
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" must be one or more of [acdn]" %
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boot_order) |
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# device type checks
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nic_type = hvparams[constants.HV_NIC_TYPE] |
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if nic_type not in constants.HT_HVM_VALID_NIC_TYPES: |
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raise errors.HypervisorError("Invalid NIC type %s specified for Xen HVM" |
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" hypervisor" % nic_type)
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disk_type = hvparams[constants.HV_DISK_TYPE] |
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if disk_type not in constants.HT_HVM_VALID_DISK_TYPES: |
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raise errors.HypervisorError("Invalid disk type %s specified for Xen HVM" |
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" hypervisor" % disk_type)
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# vnc_bind_address verification
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vnc_bind_address = hvparams[constants.HV_VNC_BIND_ADDRESS] |
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if vnc_bind_address is not None: |
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if not utils.IsValidIP(vnc_bind_address): |
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raise errors.OpPrereqError("given VNC bind address '%s' doesn't look" |
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" like a valid IP address" %
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vnc_bind_address) |
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|
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iso_path = hvparams[constants.HV_CDROM_IMAGE_PATH] |
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if iso_path and not os.path.isabs(iso_path): |
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raise errors.HypervisorError("The path to the HVM CDROM image must" |
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" be an absolute path or None, not %s" %
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iso_path) |
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def ValidateParameters(self, hvparams): |
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"""Check the given parameters for validity.
|
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|
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For the PVM hypervisor, this only check the existence of the
|
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kernel.
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@type hvparams: dict
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@param hvparams: dictionary with parameter names/value
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@raise errors.HypervisorError: when a parameter is not valid
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"""
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super(XenHvmHypervisor, self).ValidateParameters(hvparams) |
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# hvm_cdrom_image_path verification
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iso_path = hvparams[constants.HV_CDROM_IMAGE_PATH] |
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if iso_path and not os.path.isfile(iso_path): |
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raise errors.HypervisorError("The HVM CDROM image must either be a" |
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" regular file or a symlink pointing to"
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" an existing regular file, not %s" %
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iso_path) |
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@classmethod
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def _WriteConfigFile(cls, instance, block_devices, extra_args): |
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"""Create a Xen 3.1 HVM config file.
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|
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"""
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config = StringIO() |
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config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
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config.write("kernel = '/usr/lib/xen/boot/hvmloader'\n")
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config.write("builder = 'hvm'\n")
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config.write("memory = %d\n" % instance.beparams[constants.BE_MEMORY])
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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")
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else:
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config.write("pae = 0\n")
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if instance.hvparams[constants.HV_ACPI]:
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config.write("acpi = 1\n")
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else:
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config.write("acpi = 0\n")
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config.write("apic = 1\n")
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arch = os.uname()[4]
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if '64' in arch: |
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config.write("device_model = '/usr/lib64/xen/bin/qemu-dm'\n")
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else:
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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)
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else:
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config.write("boot = '%s'\n" % instance.hvparams["boot_order"]) |
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config.write("sdl = 0\n")
|
499 |
config.write("usb = 1\n")
|
500 |
config.write("usbdevice = 'tablet'\n")
|
501 |
config.write("vnc = 1\n")
|
502 |
if instance.hvparams[constants.HV_VNC_BIND_ADDRESS] is None: |
503 |
config.write("vnclisten = '%s'\n" % constants.VNC_DEFAULT_BIND_ADDRESS)
|
504 |
else:
|
505 |
config.write("vnclisten = '%s'\n" %
|
506 |
instance.hvparams["vnc_bind_address"])
|
507 |
|
508 |
if instance.network_port > constants.HT_HVM_VNC_BASE_PORT:
|
509 |
display = instance.network_port - constants.HT_HVM_VNC_BASE_PORT |
510 |
config.write("vncdisplay = %s\n" % display)
|
511 |
config.write("vncunused = 0\n")
|
512 |
else:
|
513 |
config.write("# vncdisplay = 1\n")
|
514 |
config.write("vncunused = 1\n")
|
515 |
|
516 |
try:
|
517 |
password_file = open(constants.VNC_PASSWORD_FILE, "r") |
518 |
try:
|
519 |
password = password_file.readline() |
520 |
finally:
|
521 |
password_file.close() |
522 |
except IOError: |
523 |
raise errors.OpExecError("failed to open VNC password file %s " % |
524 |
constants.VNC_PASSWORD_FILE) |
525 |
|
526 |
config.write("vncpasswd = '%s'\n" % password.rstrip())
|
527 |
|
528 |
config.write("serial = 'pty'\n")
|
529 |
config.write("localtime = 1\n")
|
530 |
|
531 |
vif_data = [] |
532 |
nic_type = instance.hvparams[constants.HV_NIC_TYPE] |
533 |
if nic_type is None: |
534 |
# ensure old instances don't change
|
535 |
nic_type_str = ", type=ioemu"
|
536 |
elif nic_type == constants.HT_HVM_DEV_PARAVIRTUAL:
|
537 |
nic_type_str = ", type=paravirtualized"
|
538 |
else:
|
539 |
nic_type_str = ", model=%s, type=ioemu" % nic_type
|
540 |
for nic in instance.nics: |
541 |
nic_str = "mac=%s, bridge=%s%s" % (nic.mac, nic.bridge, nic_type_str)
|
542 |
ip = getattr(nic, "ip", None) |
543 |
if ip is not None: |
544 |
nic_str += ", ip=%s" % ip
|
545 |
vif_data.append("'%s'" % nic_str)
|
546 |
|
547 |
config.write("vif = [%s]\n" % ",".join(vif_data)) |
548 |
disk_data = cls._GetConfigFileDiskData(instance.disk_template, |
549 |
block_devices) |
550 |
disk_type = instance.hvparams[constants.HV_DISK_TYPE] |
551 |
if disk_type in (None, constants.HT_HVM_DEV_IOEMU): |
552 |
replacement = ",ioemu:hd"
|
553 |
else:
|
554 |
replacement = ",hd"
|
555 |
disk_data = [line.replace(",sd", replacement) for line in disk_data] |
556 |
iso_path = instance.hvparams[constants.HV_CDROM_IMAGE_PATH] |
557 |
if iso_path:
|
558 |
iso = "'file:%s,hdc:cdrom,r'" % iso_path
|
559 |
disk_data.append(iso) |
560 |
|
561 |
config.write("disk = [%s]\n" % (",".join(disk_data))) |
562 |
|
563 |
config.write("on_poweroff = 'destroy'\n")
|
564 |
config.write("on_reboot = 'restart'\n")
|
565 |
config.write("on_crash = 'restart'\n")
|
566 |
if extra_args:
|
567 |
config.write("extra = '%s'\n" % extra_args)
|
568 |
# just in case it exists
|
569 |
utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
|
570 |
try:
|
571 |
f = open("/etc/xen/%s" % instance.name, "w") |
572 |
try:
|
573 |
f.write(config.getvalue()) |
574 |
finally:
|
575 |
f.close() |
576 |
except IOError, err: |
577 |
raise errors.OpExecError("Cannot write Xen instance confile" |
578 |
" file /etc/xen/%s: %s" % (instance.name, err))
|
579 |
return True |