root / lib / hypervisor / hv_xen.py @ a4273aba
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#
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#
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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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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 logger |
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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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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 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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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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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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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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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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@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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class XenHvmHypervisor(XenHypervisor): |
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"""Xen HVM hypervisor interface"""
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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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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.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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if instance.hvm_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.hvm_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.hvm_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.hvm_boot_order)
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config.write("sdl = 0\n")
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config.write("usb = 1\n")
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config.write("usbdevice = 'tablet'\n")
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config.write("vnc = 1\n")
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config.write("vnclisten = '%s'\n" % instance.vnc_bind_address)
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if instance.network_port > constants.HT_HVM_VNC_BASE_PORT:
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display = instance.network_port - constants.HT_HVM_VNC_BASE_PORT |
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config.write("vncdisplay = %s\n" % display)
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config.write("vncunused = 0\n")
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else:
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config.write("# vncdisplay = 1\n")
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config.write("vncunused = 1\n")
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try:
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password_file = open(constants.VNC_PASSWORD_FILE, "r") |
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try:
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password = password_file.readline() |
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finally:
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password_file.close() |
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except IOError: |
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raise errors.OpExecError("failed to open VNC password file %s " % |
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constants.VNC_PASSWORD_FILE) |
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config.write("vncpasswd = '%s'\n" % password.rstrip())
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config.write("serial = 'pty'\n")
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config.write("localtime = 1\n")
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vif_data = [] |
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for nic in instance.nics: |
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if instance.hvm_nic_type is None: # ensure old instances don't change |
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nic_type = ", type=ioemu"
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elif instance.hvm_nic_type == constants.HT_HVM_DEV_PARAVIRTUAL:
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nic_type = ", type=paravirtualized"
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else:
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nic_type = ", model=%s, type=ioemu" % instance.hvm_nic_type
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nic_str = "mac=%s, bridge=%s%s" % (nic.mac, nic.bridge, nic_type)
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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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disk_data = cls._GetConfigFileDiskData(instance.disk_template, |
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block_devices) |
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if ((instance.hvm_disk_type is None) or |
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(instance.hvm_disk_type == constants.HT_HVM_DEV_IOEMU)): |
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replacement = ",ioemu:hd"
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else:
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replacement = ",hd"
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disk_data = [line.replace(",sd", replacement) for line in disk_data] |
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if instance.hvm_cdrom_image_path is not None: |
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iso = "'file:%s,hdc:cdrom,r'" % (instance.hvm_cdrom_image_path)
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disk_data.append(iso) |
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config.write("disk = [%s]\n" % (",".join(disk_data))) |
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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 |