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# Copyright (C) 2006, 2007 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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"""Module that abstracts the virtualisation interface |
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""" |
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import time |
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import os |
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from cStringIO import StringIO |
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from ganeti import utils |
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from ganeti import logger |
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from ganeti import ssconf |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti.errors import HypervisorError |
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def GetHypervisor(): |
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"""Return a Hypervisor instance. |
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This function parses the cluster hypervisor configuration file and |
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instantiates a class based on the value of this file. |
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""" |
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ht_kind = ssconf.SimpleStore().GetHypervisorType() |
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if ht_kind == constants.HT_XEN_PVM30: |
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cls = XenPvmHypervisor |
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elif ht_kind == constants.HT_FAKE: |
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cls = FakeHypervisor |
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elif ht_kind == constants.HT_XEN_HVM31: |
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cls = XenHvmHypervisor |
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else: |
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raise HypervisorError("Unknown hypervisor type '%s'" % ht_kind) |
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return cls() |
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class BaseHypervisor(object): |
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"""Abstract virtualisation technology interface |
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The goal is that all aspects of the virtualisation technology must |
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be abstracted away from the rest of code. |
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""" |
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def __init__(self): |
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pass |
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def StartInstance(self, instance, block_devices, extra_args): |
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"""Start an instance.""" |
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raise NotImplementedError |
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def StopInstance(self, instance, force=False): |
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"""Stop an instance.""" |
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raise NotImplementedError |
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def RebootInstance(self, instance): |
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"""Reboot an instance.""" |
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raise NotImplementedError |
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def ListInstances(self): |
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"""Get the list of running instances.""" |
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raise NotImplementedError |
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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, state, times) |
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""" |
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raise NotImplementedError |
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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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raise NotImplementedError |
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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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raise NotImplementedError |
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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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raise NotImplementedError |
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def Verify(self): |
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"""Verify the hypervisor. |
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""" |
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raise NotImplementedError |
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class XenHypervisor(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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logger.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 HypervisorError("xm list failed, retries 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 HypervisorError("Can't parse output of xm list, 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 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 HypervisorError("Failed to start instance %s: %s (%s)" % |
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(instance.name, result.fail_reason, 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 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 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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logger.Error("Can't run 'xm info': %s" % result.fail_reason) |
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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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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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raise NotImplementedError |
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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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if not utils.CheckDaemonAlive('/var/run/xend.pid', 'xend'): |
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return "xend daemon is not running" |
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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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for cfdev, rldev in 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, cfdev.iv_name) |
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else: |
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line = "'phy:%s,%s,w'" % (rldev.dev_path, cfdev.iv_name) |
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disk_data.append(line) |
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return disk_data |
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class XenPvmHypervisor(XenHypervisor): |
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"""Xen PVM hypervisor interface""" |
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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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if instance.kernel_path in (None, constants.VALUE_DEFAULT): |
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kpath = constants.XEN_KERNEL |
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else: |
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if not os.path.exists(instance.kernel_path): |
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raise errors.HypervisorError("The kernel %s for instance %s is" |
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" missing" % (instance.kernel_path, |
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instance.name)) |
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kpath = instance.kernel_path |
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config.write("kernel = '%s'\n" % kpath) |
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# initrd handling |
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if instance.initrd_path in (None, constants.VALUE_DEFAULT): |
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if os.path.exists(constants.XEN_INITRD): |
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initrd_path = constants.XEN_INITRD |
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else: |
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initrd_path = None |
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elif instance.initrd_path == constants.VALUE_NONE: |
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initrd_path = None |
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else: |
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if not os.path.exists(instance.initrd_path): |
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raise errors.HypervisorError("The initrd %s for instance %s is" |
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" missing" % (instance.initrd_path, |
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instance.name)) |
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initrd_path = instance.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.memory) |
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config.write("vcpus = %d\n" % instance.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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@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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class FakeHypervisor(BaseHypervisor): |
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"""Fake hypervisor interface. |
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This can be used for testing the ganeti code without having to have |
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a real virtualisation software installed. |
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""" |
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_ROOT_DIR = constants.RUN_DIR + "/ganeti-fake-hypervisor" |
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def __init__(self): |
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BaseHypervisor.__init__(self) |
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if not os.path.exists(self._ROOT_DIR): |
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os.mkdir(self._ROOT_DIR) |
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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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return os.listdir(self._ROOT_DIR) |
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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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file_name = "%s/%s" % (self._ROOT_DIR, instance_name) |
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if not os.path.exists(file_name): |
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return None |
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try: |
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fh = file(file_name, "r") |
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try: |
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inst_id = fh.readline().strip() |
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memory = fh.readline().strip() |
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vcpus = fh.readline().strip() |
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stat = "---b-" |
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times = "0" |
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return (instance_name, inst_id, memory, vcpus, stat, times) |
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finally: |
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fh.close() |
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except IOError, err: |
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raise HypervisorError("Failed to list instance %s: %s" % |
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(instance_name, err)) |
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|
|
478 |
def GetAllInstancesInfo(self): |
|
479 |
"""Get properties of all instances. |
|
480 |
|
|
481 |
Returns: |
|
482 |
[(name, id, memory, vcpus, stat, times),...] |
|
483 |
""" |
|
484 |
data = [] |
|
485 |
for file_name in os.listdir(self._ROOT_DIR): |
|
486 |
try: |
|
487 |
fh = file(self._ROOT_DIR+"/"+file_name, "r") |
|
488 |
inst_id = "-1" |
|
489 |
memory = "0" |
|
490 |
stat = "-----" |
|
491 |
times = "-1" |
|
492 |
try: |
|
493 |
inst_id = fh.readline().strip() |
|
494 |
memory = fh.readline().strip() |
|
495 |
vcpus = fh.readline().strip() |
|
496 |
stat = "---b-" |
|
497 |
times = "0" |
|
498 |
finally: |
|
499 |
fh.close() |
|
500 |
data.append((file_name, inst_id, memory, vcpus, stat, times)) |
|
501 |
except IOError, err: |
|
502 |
raise HypervisorError("Failed to list instances: %s" % err) |
|
503 |
return data |
|
504 |
|
|
505 |
def StartInstance(self, instance, force, extra_args): |
|
506 |
"""Start an instance. |
|
507 |
|
|
508 |
For the fake hypervisor, it just creates a file in the base dir, |
|
509 |
creating an exception if it already exists. We don't actually |
|
510 |
handle race conditions properly, since these are *FAKE* instances. |
|
511 |
|
|
512 |
""" |
|
513 |
file_name = self._ROOT_DIR + "/%s" % instance.name |
|
514 |
if os.path.exists(file_name): |
|
515 |
raise HypervisorError("Failed to start instance %s: %s" % |
|
516 |
(instance.name, "already running")) |
|
517 |
try: |
|
518 |
fh = file(file_name, "w") |
|
519 |
try: |
|
520 |
fh.write("0\n%d\n%d\n" % (instance.memory, instance.vcpus)) |
|
521 |
finally: |
|
522 |
fh.close() |
|
523 |
except IOError, err: |
|
524 |
raise HypervisorError("Failed to start instance %s: %s" % |
|
525 |
(instance.name, err)) |
|
526 |
|
|
527 |
def StopInstance(self, instance, force=False): |
|
528 |
"""Stop an instance. |
|
529 |
|
|
530 |
For the fake hypervisor, this just removes the file in the base |
|
531 |
dir, if it exist, otherwise we raise an exception. |
|
532 |
|
|
533 |
""" |
|
534 |
file_name = self._ROOT_DIR + "/%s" % instance.name |
|
535 |
if not os.path.exists(file_name): |
|
536 |
raise HypervisorError("Failed to stop instance %s: %s" % |
|
537 |
(instance.name, "not running")) |
|
538 |
utils.RemoveFile(file_name) |
|
539 |
|
|
540 |
def RebootInstance(self, instance): |
|
541 |
"""Reboot an instance. |
|
542 |
|
|
543 |
For the fake hypervisor, this does nothing. |
|
544 |
|
|
545 |
""" |
|
546 |
return |
|
547 |
|
|
548 |
def GetNodeInfo(self): |
|
549 |
"""Return information about the node. |
|
550 |
|
|
551 |
The return value is a dict, which has to have the following items: |
|
552 |
(all values in MiB) |
|
553 |
- memory_total: the total memory size on the node |
|
554 |
- memory_free: the available memory on the node for instances |
|
555 |
- memory_dom0: the memory used by the node itself, if available |
|
556 |
|
|
557 |
""" |
|
558 |
# global ram usage from the xm info command |
|
559 |
# memory : 3583 |
|
560 |
# free_memory : 747 |
|
561 |
# note: in xen 3, memory has changed to total_memory |
|
562 |
try: |
|
563 |
fh = file("/proc/meminfo") |
|
564 |
try: |
|
565 |
data = fh.readlines() |
|
566 |
finally: |
|
567 |
fh.close() |
|
568 |
except IOError, err: |
|
569 |
raise HypervisorError("Failed to list node info: %s" % err) |
|
570 |
|
|
571 |
result = {} |
|
572 |
sum_free = 0 |
|
573 |
for line in data: |
|
574 |
splitfields = line.split(":", 1) |
|
575 |
|
|
576 |
if len(splitfields) > 1: |
|
577 |
key = splitfields[0].strip() |
|
578 |
val = splitfields[1].strip() |
|
579 |
if key == 'MemTotal': |
|
580 |
result['memory_total'] = int(val.split()[0])/1024 |
|
581 |
elif key in ('MemFree', 'Buffers', 'Cached'): |
|
582 |
sum_free += int(val.split()[0])/1024 |
|
583 |
elif key == 'Active': |
|
584 |
result['memory_dom0'] = int(val.split()[0])/1024 |
|
585 |
|
|
586 |
result['memory_free'] = sum_free |
|
587 |
return result |
|
588 |
|
|
589 |
@staticmethod |
|
590 |
def GetShellCommandForConsole(instance): |
|
591 |
"""Return a command for connecting to the console of an instance. |
|
592 |
|
|
593 |
""" |
|
594 |
return "echo Console not available for fake hypervisor" |
|
595 |
|
|
596 |
def Verify(self): |
|
597 |
"""Verify the hypervisor. |
|
598 |
|
|
599 |
For the fake hypervisor, it just checks the existence of the base |
|
600 |
dir. |
|
601 |
|
|
602 |
""" |
|
603 |
if not os.path.exists(self._ROOT_DIR): |
|
604 |
return "The required directory '%s' does not exist." % self._ROOT_DIR |
|
605 |
|
|
606 |
|
|
607 |
class XenHvmHypervisor(XenHypervisor): |
|
608 |
"""Xen HVM hypervisor interface""" |
|
609 |
|
|
610 |
@classmethod |
|
611 |
def _WriteConfigFile(cls, instance, block_devices, extra_args): |
|
612 |
"""Create a Xen 3.1 HVM config file. |
|
613 |
|
|
614 |
""" |
|
615 |
config = StringIO() |
|
616 |
config.write("# this is autogenerated by Ganeti, please do not edit\n#\n") |
|
617 |
config.write("kernel = '/usr/lib/xen/boot/hvmloader'\n") |
|
618 |
config.write("builder = 'hvm'\n") |
|
619 |
config.write("memory = %d\n" % instance.memory) |
|
620 |
config.write("vcpus = %d\n" % instance.vcpus) |
|
621 |
config.write("name = '%s'\n" % instance.name) |
|
622 |
config.write("pae = 1\n") |
|
623 |
config.write("acpi = 1\n") |
|
624 |
config.write("apic = 1\n") |
|
625 |
arch = os.uname()[4] |
|
626 |
if '64' in arch: |
|
627 |
config.write("device_model = '/usr/lib64/xen/bin/qemu-dm'\n") |
|
628 |
else: |
|
629 |
config.write("device_model = '/usr/lib/xen/bin/qemu-dm'\n") |
|
630 |
if instance.hvm_boot_order is None: |
|
631 |
config.write("boot = '%s'\n" % constants.HT_HVM_DEFAULT_BOOT_ORDER) |
|
632 |
else: |
|
633 |
config.write("boot = '%s'\n" % instance.hvm_boot_order) |
|
634 |
config.write("sdl = 0\n") |
|
635 |
config.write("usb = 1\n"); |
|
636 |
config.write("usbdevice = 'tablet'\n"); |
|
637 |
config.write("vnc = 1\n") |
|
638 |
config.write("vnclisten = '0.0.0.0'\n") |
|
639 |
|
|
640 |
if instance.network_port > constants.HT_HVM_VNC_BASE_PORT: |
|
641 |
display = instance.network_port - constants.HT_HVM_VNC_BASE_PORT |
|
642 |
config.write("vncdisplay = %s\n" % display) |
|
643 |
config.write("vncunused = 0\n") |
|
644 |
else: |
|
645 |
config.write("# vncdisplay = 1\n") |
|
646 |
config.write("vncunused = 1\n") |
|
647 |
|
|
648 |
try: |
|
649 |
password_file = open(constants.VNC_PASSWORD_FILE, "r") |
|
650 |
try: |
|
651 |
password = password_file.readline() |
|
652 |
finally: |
|
653 |
password_file.close() |
|
654 |
except IOError: |
|
655 |
raise errors.OpExecError("failed to open VNC password file %s " % |
|
656 |
constants.VNC_PASSWORD_FILE) |
|
657 |
|
|
658 |
config.write("vncpasswd = '%s'\n" % password.rstrip()) |
|
659 |
|
|
660 |
config.write("serial = 'pty'\n") |
|
661 |
config.write("localtime = 1\n") |
|
662 |
|
|
663 |
vif_data = [] |
|
664 |
for nic in instance.nics: |
|
665 |
nic_str = "mac=%s, bridge=%s, type=ioemu" % (nic.mac, nic.bridge) |
|
666 |
ip = getattr(nic, "ip", None) |
|
667 |
if ip is not None: |
|
668 |
nic_str += ", ip=%s" % ip |
|
669 |
vif_data.append("'%s'" % nic_str) |
|
670 |
|
|
671 |
config.write("vif = [%s]\n" % ",".join(vif_data)) |
|
672 |
iso = "'file:/srv/ganeti/iso/hvm-install.iso,hdc:cdrom,r'" |
|
673 |
config.write("disk = [%s, %s]\n" % (",".join( |
|
674 |
cls._GetConfigFileDiskData(instance.disk_template, |
|
675 |
block_devices)), iso)) |
|
676 |
config.write("on_poweroff = 'destroy'\n") |
|
677 |
config.write("on_reboot = 'restart'\n") |
|
678 |
config.write("on_crash = 'restart'\n") |
|
679 |
if extra_args: |
|
680 |
config.write("extra = '%s'\n" % extra_args) |
|
681 |
# just in case it exists |
|
682 |
utils.RemoveFile("/etc/xen/auto/%s" % instance.name) |
|
683 |
try: |
|
684 |
f = open("/etc/xen/%s" % instance.name, "w") |
|
685 |
try: |
|
686 |
f.write(config.getvalue()) |
|
687 |
finally: |
|
688 |
f.close() |
|
689 |
except IOError, err: |
|
690 |
raise errors.OpExecError("Cannot write Xen instance confile" |
|
691 |
" file /etc/xen/%s: %s" % (instance.name, err)) |
|
692 |
return True |
|
693 |
|
|
694 |
@staticmethod |
|
695 |
def GetShellCommandForConsole(instance): |
|
696 |
"""Return a command for connecting to the console of an instance. |
|
697 |
|
|
698 |
""" |
|
699 |
if instance.network_port is None: |
|
700 |
raise errors.OpExecError("no console port defined for %s" |
|
701 |
% instance.name) |
|
702 |
else: |
|
703 |
raise errors.OpExecError("no PTY console, connect to %s:%s via VNC" |
|
704 |
% (instance.primary_node, |
|
705 |
instance.network_port)) |
Also available in: Unified diff