root / lib / hypervisor / hv_xen.py @ 58d38b02
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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 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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REBOOT_RETRY_COUNT = 60
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REBOOT_RETRY_INTERVAL = 10
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ANCILLARY_FILES = [ |
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'/etc/xen/xend-config.sxp',
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'/etc/xen/scripts/vif-bridge',
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] |
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@classmethod
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def _WriteConfigFile(cls, instance, block_devices): |
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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 _WriteConfigFileStatic(instance_name, data): |
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"""Write the Xen config file for the instance.
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This version of the function just writes the config file from static data.
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"""
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utils.WriteFile("/etc/xen/%s" % instance_name, data=data)
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@staticmethod
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def _ReadConfigFile(instance_name): |
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"""Returns the contents of the instance config file.
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"""
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try:
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file_content = utils.ReadFile("/etc/xen/%s" % instance_name)
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except EnvironmentError, err: |
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raise errors.HypervisorError("Failed to load Xen config file: %s" % err) |
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return file_content
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@staticmethod
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def _RemoveConfigFile(instance_name): |
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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 _RunXmList(xmlist_errors): |
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"""Helper function for L{_GetXMList} to run "xm list".
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"""
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result = utils.RunCmd(["xm", "list"]) |
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if result.failed:
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logging.error("xm list failed (%s): %s", result.fail_reason,
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result.output) |
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xmlist_errors.append(result) |
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raise utils.RetryAgain()
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# skip over the heading
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return result.stdout.splitlines()[1:] |
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@classmethod
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def _GetXMList(cls, 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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@return: list of (name, id, memory, vcpus, state, time spent)
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"""
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xmlist_errors = [] |
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try:
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lines = utils.Retry(cls._RunXmList, 1, 5, args=(xmlist_errors, )) |
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except utils.RetryTimeout:
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if xmlist_errors:
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xmlist_result = xmlist_errors.pop() |
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errmsg = ("xm list failed, timeout exceeded (%s): %s" %
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(xmlist_result.fail_reason, xmlist_result.output)) |
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else:
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errmsg = "xm list failed"
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raise errors.HypervisorError(errmsg)
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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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@param instance_name: the instance name
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@return: tuple (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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@return: list of tuples (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): |
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"""Start an instance.
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"""
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self._WriteConfigFile(instance, block_devices)
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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, retry=False): |
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"""Stop an instance.
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"""
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self._RemoveConfigFile(instance.name)
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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, %s" % |
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(instance.name, result.fail_reason, |
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result.output)) |
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def RebootInstance(self, instance): |
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"""Reboot an instance.
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"""
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ini_info = self.GetInstanceInfo(instance.name)
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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, %s" % |
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(instance.name, result.fail_reason, |
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result.output)) |
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def _CheckInstance(): |
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new_info = self.GetInstanceInfo(instance.name)
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# check if the domain ID has changed or the run time has decreased
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if new_info[1] != ini_info[1] or new_info[5] < ini_info[5]: |
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return
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raise utils.RetryAgain()
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try:
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utils.Retry(_CheckInstance, self.REBOOT_RETRY_INTERVAL,
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self.REBOOT_RETRY_INTERVAL * self.REBOOT_RETRY_COUNT) |
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except utils.RetryTimeout:
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raise errors.HypervisorError("Failed to reboot instance %s: instance" |
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" did not reboot in the expected interval" %
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(instance.name, )) |
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def GetNodeInfo(self): |
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"""Return information about the node.
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@return: a dict with the following keys (memory 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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- nr_cpus: total number of CPUs
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- nr_nodes: in a NUMA system, the number of domains
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- nr_sockets: the number of physical CPU sockets in the node
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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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cores_per_socket = threads_per_core = nr_cpus = None
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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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nr_cpus = result['cpu_total'] = int(val) |
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elif key == 'nr_nodes': |
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result['cpu_nodes'] = int(val) |
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elif key == 'cores_per_socket': |
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cores_per_socket = int(val)
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elif key == 'threads_per_core': |
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threads_per_core = int(val)
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if (cores_per_socket is not None and |
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threads_per_core is not None and nr_cpus is not None): |
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result['cpu_sockets'] = nr_cpus / (cores_per_socket * threads_per_core)
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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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@classmethod
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def GetShellCommandForConsole(cls, instance, hvparams, beparams): |
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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, %s" % (result.fail_reason, result.output) |
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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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@param disk_template: string containing instance disk template
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@param block_devices: list of tuples (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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@return: 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, dev_path) in zip(namespace, block_devices): |
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if cfdev.mode == constants.DISK_RDWR:
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mode = "w"
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else:
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mode = "r"
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if cfdev.dev_type == constants.LD_FILE:
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line = "'%s:%s,%s,%s'" % (FILE_DRIVER_MAP[cfdev.physical_id[0]], |
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dev_path, sd_name, mode) |
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else:
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line = "'phy:%s,%s,%s'" % (dev_path, sd_name, mode)
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disk_data.append(line) |
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return disk_data
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def MigrationInfo(self, instance): |
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"""Get instance information to perform a migration.
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@type instance: L{objects.Instance}
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@param instance: instance to be migrated
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@rtype: string
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@return: content of the xen config file
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"""
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return self._ReadConfigFile(instance.name) |
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def AcceptInstance(self, instance, info, target): |
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"""Prepare to accept an instance.
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@type instance: L{objects.Instance}
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@param instance: instance to be accepted
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@type info: string
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@param info: content of the xen config file on the source node
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@type target: string
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@param target: target host (usually ip), on this node
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"""
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pass
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def FinalizeMigration(self, instance, info, success): |
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"""Finalize an instance migration.
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After a successful migration we write the xen config file.
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We do nothing on a failure, as we did not change anything at accept time.
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@type instance: L{objects.Instance}
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@param instance: instance whose migration is being aborted
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@type info: string
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@param info: content of the xen config file on the source node
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@type success: boolean
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@param success: whether the migration was a success or a failure
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"""
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if success:
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self._WriteConfigFileStatic(instance.name, info)
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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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The migration will not be attempted if the instance is not
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currently running.
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@type instance: L{objects.Instance}
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@param instance: the instance to be migrated
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@type target: string
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@param target: ip address of the target node
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@type live: boolean
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@param live: perform a live migration
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"""
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if self.GetInstanceInfo(instance.name) 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.name, 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.name, result.output)) |
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# remove old xen file after migration succeeded
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try:
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self._RemoveConfigFile(instance.name)
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except EnvironmentError: |
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logging.exception("Failure while removing instance config file")
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@classmethod
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def PowercycleNode(cls): |
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"""Xen-specific powercycle.
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This first does a Linux reboot (which triggers automatically a Xen
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reboot), and if that fails it tries to do a Xen reboot. The reason
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we don't try a Xen reboot first is that the xen reboot launches an
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external command which connects to the Xen hypervisor, and that
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won't work in case the root filesystem is broken and/or the xend
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daemon is not working.
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"""
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try:
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cls.LinuxPowercycle() |
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finally:
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utils.RunCmd(["xm", "debug", "R"]) |
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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_USE_BOOTLOADER: hv_base.NO_CHECK, |
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constants.HV_BOOTLOADER_PATH: hv_base.OPT_FILE_CHECK, |
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constants.HV_BOOTLOADER_ARGS: hv_base.NO_CHECK, |
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constants.HV_KERNEL_PATH: hv_base.REQ_FILE_CHECK, |
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constants.HV_INITRD_PATH: hv_base.OPT_FILE_CHECK, |
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constants.HV_ROOT_PATH: hv_base.REQUIRED_CHECK, |
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constants.HV_KERNEL_ARGS: hv_base.NO_CHECK, |
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} |
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@classmethod
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def _WriteConfigFile(cls, instance, block_devices): |
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"""Write the Xen config file for the instance.
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|
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"""
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hvp = instance.hvparams |
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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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# if bootloader is True, use bootloader instead of kernel and ramdisk
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# parameters.
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if hvp[constants.HV_USE_BOOTLOADER]:
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# bootloader handling
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bootloader_path = hvp[constants.HV_BOOTLOADER_PATH] |
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if bootloader_path:
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config.write("bootloader = '%s'\n" % bootloader_path)
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else:
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raise errors.HypervisorError("Bootloader enabled, but missing" |
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" bootloader path")
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bootloader_args = hvp[constants.HV_BOOTLOADER_ARGS] |
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if bootloader_args:
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config.write("bootargs = '%s'\n" % bootloader_args)
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else:
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# kernel handling
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kpath = hvp[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 = hvp[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" % (nic.mac)
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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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if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
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nic_str += ", bridge=%s" % nic.nicparams[constants.NIC_LINK]
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|
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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 = '%s'\n" % hvp[constants.HV_ROOT_PATH])
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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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config.write("extra = '%s'\n" % hvp[constants.HV_KERNEL_ARGS])
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# just in case it exists
|
509 |
utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
|
510 |
try:
|
511 |
utils.WriteFile("/etc/xen/%s" % instance.name, data=config.getvalue())
|
512 |
except EnvironmentError, err: |
513 |
raise errors.HypervisorError("Cannot write Xen instance confile" |
514 |
" file /etc/xen/%s: %s" %
|
515 |
(instance.name, err)) |
516 |
|
517 |
return True |
518 |
|
519 |
|
520 |
class XenHvmHypervisor(XenHypervisor): |
521 |
"""Xen HVM hypervisor interface"""
|
522 |
|
523 |
ANCILLARY_FILES = XenHypervisor.ANCILLARY_FILES + [ |
524 |
constants.VNC_PASSWORD_FILE, |
525 |
] |
526 |
|
527 |
PARAMETERS = { |
528 |
constants.HV_ACPI: hv_base.NO_CHECK, |
529 |
constants.HV_BOOT_ORDER: (True, ) +
|
530 |
(lambda x: x and len(x.strip("acdn")) == 0, |
531 |
"Invalid boot order specified, must be one or more of [acdn]",
|
532 |
None, None), |
533 |
constants.HV_CDROM_IMAGE_PATH: hv_base.OPT_FILE_CHECK, |
534 |
constants.HV_DISK_TYPE: |
535 |
hv_base.ParamInSet(True, constants.HT_HVM_VALID_DISK_TYPES),
|
536 |
constants.HV_NIC_TYPE: |
537 |
hv_base.ParamInSet(True, constants.HT_HVM_VALID_NIC_TYPES),
|
538 |
constants.HV_PAE: hv_base.NO_CHECK, |
539 |
constants.HV_VNC_BIND_ADDRESS: |
540 |
(False, utils.IsValidIP,
|
541 |
"VNC bind address is not a valid IP address", None, None), |
542 |
constants.HV_KERNEL_PATH: hv_base.REQ_FILE_CHECK, |
543 |
constants.HV_DEVICE_MODEL: hv_base.REQ_FILE_CHECK, |
544 |
constants.HV_VNC_PASSWORD_FILE: hv_base.REQ_FILE_CHECK, |
545 |
} |
546 |
|
547 |
@classmethod
|
548 |
def _WriteConfigFile(cls, instance, block_devices): |
549 |
"""Create a Xen 3.1 HVM config file.
|
550 |
|
551 |
"""
|
552 |
hvp = instance.hvparams |
553 |
|
554 |
config = StringIO() |
555 |
config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
|
556 |
|
557 |
# kernel handling
|
558 |
kpath = hvp[constants.HV_KERNEL_PATH] |
559 |
config.write("kernel = '%s'\n" % kpath)
|
560 |
|
561 |
config.write("builder = 'hvm'\n")
|
562 |
config.write("memory = %d\n" % instance.beparams[constants.BE_MEMORY])
|
563 |
config.write("vcpus = %d\n" % instance.beparams[constants.BE_VCPUS])
|
564 |
config.write("name = '%s'\n" % instance.name)
|
565 |
if hvp[constants.HV_PAE]:
|
566 |
config.write("pae = 1\n")
|
567 |
else:
|
568 |
config.write("pae = 0\n")
|
569 |
if hvp[constants.HV_ACPI]:
|
570 |
config.write("acpi = 1\n")
|
571 |
else:
|
572 |
config.write("acpi = 0\n")
|
573 |
config.write("apic = 1\n")
|
574 |
config.write("device_model = '%s'\n" % hvp[constants.HV_DEVICE_MODEL])
|
575 |
config.write("boot = '%s'\n" % hvp[constants.HV_BOOT_ORDER])
|
576 |
config.write("sdl = 0\n")
|
577 |
config.write("usb = 1\n")
|
578 |
config.write("usbdevice = 'tablet'\n")
|
579 |
config.write("vnc = 1\n")
|
580 |
if hvp[constants.HV_VNC_BIND_ADDRESS] is None: |
581 |
config.write("vnclisten = '%s'\n" % constants.VNC_DEFAULT_BIND_ADDRESS)
|
582 |
else:
|
583 |
config.write("vnclisten = '%s'\n" % hvp[constants.HV_VNC_BIND_ADDRESS])
|
584 |
|
585 |
if instance.network_port > constants.VNC_BASE_PORT:
|
586 |
display = instance.network_port - constants.VNC_BASE_PORT |
587 |
config.write("vncdisplay = %s\n" % display)
|
588 |
config.write("vncunused = 0\n")
|
589 |
else:
|
590 |
config.write("# vncdisplay = 1\n")
|
591 |
config.write("vncunused = 1\n")
|
592 |
|
593 |
vnc_pwd_file = hvp[constants.HV_VNC_PASSWORD_FILE] |
594 |
try:
|
595 |
password = utils.ReadFile(vnc_pwd_file) |
596 |
except EnvironmentError, err: |
597 |
raise errors.HypervisorError("Failed to open VNC password file %s: %s" % |
598 |
(vnc_pwd_file, err)) |
599 |
|
600 |
config.write("vncpasswd = '%s'\n" % password.rstrip())
|
601 |
|
602 |
config.write("serial = 'pty'\n")
|
603 |
config.write("localtime = 1\n")
|
604 |
|
605 |
vif_data = [] |
606 |
nic_type = hvp[constants.HV_NIC_TYPE] |
607 |
if nic_type is None: |
608 |
# ensure old instances don't change
|
609 |
nic_type_str = ", type=ioemu"
|
610 |
elif nic_type == constants.HT_NIC_PARAVIRTUAL:
|
611 |
nic_type_str = ", type=paravirtualized"
|
612 |
else:
|
613 |
nic_type_str = ", model=%s, type=ioemu" % nic_type
|
614 |
for nic in instance.nics: |
615 |
nic_str = "mac=%s%s" % (nic.mac, nic_type_str)
|
616 |
ip = getattr(nic, "ip", None) |
617 |
if ip is not None: |
618 |
nic_str += ", ip=%s" % ip
|
619 |
vif_data.append("'%s'" % nic_str)
|
620 |
if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
|
621 |
nic_str += ", bridge=%s" % nic.nicparams[constants.NIC_LINK]
|
622 |
|
623 |
config.write("vif = [%s]\n" % ",".join(vif_data)) |
624 |
disk_data = cls._GetConfigFileDiskData(instance.disk_template, |
625 |
block_devices) |
626 |
disk_type = hvp[constants.HV_DISK_TYPE] |
627 |
if disk_type in (None, constants.HT_DISK_IOEMU): |
628 |
replacement = ",ioemu:hd"
|
629 |
else:
|
630 |
replacement = ",hd"
|
631 |
disk_data = [line.replace(",sd", replacement) for line in disk_data] |
632 |
iso_path = hvp[constants.HV_CDROM_IMAGE_PATH] |
633 |
if iso_path:
|
634 |
iso = "'file:%s,hdc:cdrom,r'" % iso_path
|
635 |
disk_data.append(iso) |
636 |
|
637 |
config.write("disk = [%s]\n" % (",".join(disk_data))) |
638 |
|
639 |
config.write("on_poweroff = 'destroy'\n")
|
640 |
config.write("on_reboot = 'restart'\n")
|
641 |
config.write("on_crash = 'restart'\n")
|
642 |
# just in case it exists
|
643 |
utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
|
644 |
try:
|
645 |
utils.WriteFile("/etc/xen/%s" % instance.name,
|
646 |
data=config.getvalue()) |
647 |
except EnvironmentError, err: |
648 |
raise errors.HypervisorError("Cannot write Xen instance confile" |
649 |
" file /etc/xen/%s: %s" %
|
650 |
(instance.name, err)) |
651 |
|
652 |
return True |