root / lib / hypervisor / hv_xen.py @ 8ef418bb
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#
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# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 logging |
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import string # pylint: disable=W0402 |
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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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from ganeti import netutils |
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from ganeti import objects |
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from ganeti import pathutils |
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from ganeti import ssconf |
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XEND_CONFIG_FILE = utils.PathJoin(pathutils.XEN_CONFIG_DIR, "xend-config.sxp")
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XL_CONFIG_FILE = utils.PathJoin(pathutils.XEN_CONFIG_DIR, "xen/xl.conf")
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VIF_BRIDGE_SCRIPT = utils.PathJoin(pathutils.XEN_CONFIG_DIR, |
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"scripts/vif-bridge")
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_DOM0_NAME = "Domain-0"
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_DISK_LETTERS = string.ascii_lowercase |
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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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def _CreateConfigCpus(cpu_mask): |
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"""Create a CPU config string for Xen's config file.
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"""
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# Convert the string CPU mask to a list of list of int's
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cpu_list = utils.ParseMultiCpuMask(cpu_mask) |
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if len(cpu_list) == 1: |
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all_cpu_mapping = cpu_list[0]
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if all_cpu_mapping == constants.CPU_PINNING_OFF:
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# If CPU pinning has 1 entry that's "all", then remove the
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# parameter from the config file
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return None |
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else:
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# If CPU pinning has one non-all entry, mapping all vCPUS (the entire
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# VM) to one physical CPU, using format 'cpu = "C"'
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return "cpu = \"%s\"" % ",".join(map(str, all_cpu_mapping)) |
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else:
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def _GetCPUMap(vcpu): |
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if vcpu[0] == constants.CPU_PINNING_ALL_VAL: |
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cpu_map = constants.CPU_PINNING_ALL_XEN |
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else:
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cpu_map = ",".join(map(str, vcpu)) |
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return "\"%s\"" % cpu_map |
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# build the result string in format 'cpus = [ "c", "c", "c" ]',
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# where each c is a physical CPU number, a range, a list, or any
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# combination
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return "cpus = [ %s ]" % ", ".join(map(_GetCPUMap, cpu_list)) |
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def _RunInstanceList(fn, instance_list_errors): |
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"""Helper function for L{_GetInstanceList} to retrieve the list of instances
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from xen.
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@type fn: callable
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@param fn: Function to query xen for the list of instances
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@type instance_list_errors: list
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@param instance_list_errors: Error list
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@rtype: list
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"""
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result = fn() |
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if result.failed:
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logging.error("Retrieving the instance list from xen failed (%s): %s",
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result.fail_reason, result.output) |
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instance_list_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()
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def _ParseInstanceList(lines, include_node): |
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"""Parses the output of listing instances by xen.
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@type lines: list
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@param lines: Result of retrieving the instance list from xen
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@type include_node: boolean
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@param include_node: If True, return information for Dom0
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@return: list of tuple containing (name, id, memory, vcpus, state, time
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spent)
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"""
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result = [] |
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# Iterate through all lines while ignoring header
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for line in lines[1:]: |
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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 instance 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 (TypeError, ValueError), err: |
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raise errors.HypervisorError("Can't parse instance 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] != _DOM0_NAME: |
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result.append(data) |
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return result
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def _GetInstanceList(fn, include_node, _timeout=5): |
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"""Return the list of running instances.
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See L{_RunInstanceList} and L{_ParseInstanceList} for parameter details.
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"""
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instance_list_errors = [] |
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try:
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lines = utils.Retry(_RunInstanceList, (0.3, 1.5, 1.0), _timeout, |
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args=(fn, instance_list_errors)) |
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except utils.RetryTimeout:
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if instance_list_errors:
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instance_list_result = instance_list_errors.pop() |
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errmsg = ("listing instances failed, timeout exceeded (%s): %s" %
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(instance_list_result.fail_reason, instance_list_result.output)) |
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else:
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errmsg = "listing instances failed"
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raise errors.HypervisorError(errmsg)
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return _ParseInstanceList(lines, include_node)
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def _ParseNodeInfo(info): |
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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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- 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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- hv_version: the hypervisor version in the form (major, minor)
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"""
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result = {} |
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cores_per_socket = threads_per_core = nr_cpus = None
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xen_major, xen_minor = None, None |
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memory_total = None
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memory_free = None
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for line in info.splitlines(): |
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fields = line.split(":", 1) |
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if len(fields) < 2: |
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continue
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(key, val) = map(lambda s: s.strip(), fields) |
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# Note: in Xen 3, memory has changed to total_memory
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if key in ("memory", "total_memory"): |
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memory_total = int(val)
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elif key == "free_memory": |
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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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elif key == "xen_major": |
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xen_major = int(val)
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elif key == "xen_minor": |
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xen_minor = int(val)
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if None not in [cores_per_socket, threads_per_core, nr_cpus]: |
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result["cpu_sockets"] = nr_cpus / (cores_per_socket * threads_per_core)
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if memory_free is not None: |
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result["memory_free"] = memory_free
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if memory_total is not None: |
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result["memory_total"] = memory_total
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if not (xen_major is None or xen_minor is None): |
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result[constants.HV_NODEINFO_KEY_VERSION] = (xen_major, xen_minor) |
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return result
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def _MergeInstanceInfo(info, instance_list): |
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"""Updates node information from L{_ParseNodeInfo} with instance info.
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@type info: dict
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@param info: Result from L{_ParseNodeInfo}
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@type instance_list: list of tuples
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@param instance_list: list of instance information; one tuple per instance
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@rtype: dict
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"""
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total_instmem = 0
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for (name, _, mem, vcpus, _, _) in instance_list: |
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if name == _DOM0_NAME:
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info["memory_dom0"] = mem
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info["dom0_cpus"] = vcpus
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# Include Dom0 in total memory usage
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total_instmem += mem |
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memory_free = info.get("memory_free")
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memory_total = info.get("memory_total")
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# Calculate memory used by hypervisor
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if None not in [memory_total, memory_free, total_instmem]: |
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info["memory_hv"] = memory_total - memory_free - total_instmem
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return info
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def _GetNodeInfo(info, instance_list): |
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"""Combines L{_MergeInstanceInfo} and L{_ParseNodeInfo}.
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@type instance_list: list of tuples
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@param instance_list: list of instance information; one tuple per instance
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"""
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return _MergeInstanceInfo(_ParseNodeInfo(info), instance_list)
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def _GetConfigFileDiskData(block_devices, blockdev_prefix, |
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_letters=_DISK_LETTERS): |
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"""Get disk directives 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 block_devices: list of tuples (cfdev, rldev):
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- cfdev: dict containing ganeti config disk part
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- rldev: ganeti.block.bdev.BlockDev object
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@param blockdev_prefix: a string containing blockdevice prefix,
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e.g. "sd" for /dev/sda
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@return: string containing disk directive for xen instance config file
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"""
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if len(block_devices) > len(_letters): |
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raise errors.HypervisorError("Too many disks") |
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disk_data = [] |
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for sd_suffix, (cfdev, dev_path) in zip(_letters, block_devices): |
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sd_name = blockdev_prefix + sd_suffix |
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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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driver = _FILE_DRIVER_MAP[cfdev.physical_id[0]]
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else:
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driver = "phy"
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disk_data.append("'%s:%s,%s,%s'" % (driver, dev_path, sd_name, mode))
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return disk_data
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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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CAN_MIGRATE = True
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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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XEND_CONFIG_FILE, |
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XL_CONFIG_FILE, |
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VIF_BRIDGE_SCRIPT, |
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] |
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ANCILLARY_FILES_OPT = [ |
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XL_CONFIG_FILE, |
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] |
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def __init__(self, _cfgdir=None, _run_cmd_fn=None, _cmd=None): |
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hv_base.BaseHypervisor.__init__(self)
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if _cfgdir is None: |
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self._cfgdir = pathutils.XEN_CONFIG_DIR
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else:
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self._cfgdir = _cfgdir
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if _run_cmd_fn is None: |
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self._run_cmd_fn = utils.RunCmd
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else:
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self._run_cmd_fn = _run_cmd_fn
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self._cmd = _cmd
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def _GetCommand(self, hvparams): |
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"""Returns Xen command to use.
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@type hvparams: dict of strings
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@param hvparams: hypervisor parameters
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"""
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if self._cmd is None: |
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if hvparams is None or constants.HV_XEN_CMD not in hvparams: |
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raise errors.HypervisorError("Cannot determine xen command.") |
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else:
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cmd = hvparams[constants.HV_XEN_CMD] |
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else:
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cmd = self._cmd
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if cmd not in constants.KNOWN_XEN_COMMANDS: |
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raise errors.ProgrammerError("Unknown Xen command '%s'" % cmd) |
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return cmd
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def _RunXen(self, args, hvparams): |
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"""Wrapper around L{utils.process.RunCmd} to run Xen command.
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@type hvparams: dict of strings
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@param hvparams: dictionary of hypervisor params
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@see: L{utils.process.RunCmd}
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"""
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cmd = [self._GetCommand(hvparams)]
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cmd.extend(args) |
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return self._run_cmd_fn(cmd) |
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def _ConfigFileName(self, instance_name): |
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"""Get the config file name for an instance.
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@param instance_name: instance name
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@type instance_name: str
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@return: fully qualified path to instance config file
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@rtype: str
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"""
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return utils.PathJoin(self._cfgdir, instance_name) |
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@classmethod
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def _GetConfig(cls, instance, startup_memory, block_devices): |
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"""Build Xen configuration for an instance.
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"""
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raise NotImplementedError |
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def _WriteConfigFile(self, 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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# just in case it exists
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utils.RemoveFile(utils.PathJoin(self._cfgdir, "auto", instance_name)) |
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cfg_file = self._ConfigFileName(instance_name)
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try:
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utils.WriteFile(cfg_file, data=data) |
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except EnvironmentError, err: |
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raise errors.HypervisorError("Cannot write Xen instance configuration" |
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" file %s: %s" % (cfg_file, err))
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def _ReadConfigFile(self, instance_name): |
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"""Returns the contents of the instance config file.
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"""
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filename = self._ConfigFileName(instance_name)
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try:
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file_content = utils.ReadFile(filename) |
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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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def _RemoveConfigFile(self, instance_name): |
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"""Remove the xen configuration file.
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"""
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utils.RemoveFile(self._ConfigFileName(instance_name))
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def _StashConfigFile(self, instance_name): |
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"""Move the Xen config file to the log directory and return its new path.
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"""
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old_filename = self._ConfigFileName(instance_name)
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base = ("%s-%s" %
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(instance_name, utils.TimestampForFilename())) |
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new_filename = utils.PathJoin(pathutils.LOG_XEN_DIR, base) |
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utils.RenameFile(old_filename, new_filename) |
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return new_filename
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def _GetInstanceList(self, include_node, hvparams): |
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"""Wrapper around module level L{_GetInstanceList}.
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@type hvparams: dict of strings
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@param hvparams: hypervisor parameters to be used on this node
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"""
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return _GetInstanceList(lambda: self._RunXen(["list"], hvparams), |
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include_node) |
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def ListInstances(self, hvparams=None): |
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"""Get the list of running instances.
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"""
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instance_list = self._GetInstanceList(False, hvparams) |
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names = [info[0] for info in instance_list] |
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return names
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def GetInstanceInfo(self, instance_name, hvparams=None): |
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"""Get instance properties.
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@type instance_name: string
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@param instance_name: the instance name
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@type hvparams: dict of strings
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@param hvparams: the instance's hypervisor params
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@return: tuple (name, id, memory, vcpus, stat, times)
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"""
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instance_list = self._GetInstanceList(instance_name == _DOM0_NAME, hvparams)
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result = None
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for data in instance_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, hvparams=None): |
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"""Get properties of all instances.
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@type hvparams: dict of strings
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@param hvparams: hypervisor parameters
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@return: list of tuples (name, id, memory, vcpus, stat, times)
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"""
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return self._GetInstanceList(False, hvparams) |
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def _MakeConfigFile(self, instance, startup_memory, block_devices): |
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"""Gather configuration details and write to disk.
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See L{_GetConfig} for arguments.
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"""
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buf = StringIO() |
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buf.write("# Automatically generated by Ganeti. Do not edit!\n")
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buf.write("\n")
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buf.write(self._GetConfig(instance, startup_memory, block_devices))
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buf.write("\n")
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self._WriteConfigFile(instance.name, buf.getvalue())
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def StartInstance(self, instance, block_devices, startup_paused): |
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"""Start an instance.
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"""
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startup_memory = self._InstanceStartupMemory(instance,
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hvparams=instance.hvparams) |
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self._MakeConfigFile(instance, startup_memory, block_devices)
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cmd = ["create"]
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if startup_paused:
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cmd.append("-p")
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cmd.append(self._ConfigFileName(instance.name))
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result = self._RunXen(cmd, instance.hvparams)
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if result.failed:
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# Move the Xen configuration file to the log directory to avoid
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# leaving a stale config file behind.
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stashed_config = self._StashConfigFile(instance.name)
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raise errors.HypervisorError("Failed to start instance %s: %s (%s). Moved" |
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" config file to %s" %
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(instance.name, result.fail_reason, |
522 |
result.output, stashed_config)) |
523 |
|
524 |
def StopInstance(self, instance, force=False, retry=False, name=None): |
525 |
"""Stop an instance.
|
526 |
|
527 |
"""
|
528 |
if name is None: |
529 |
name = instance.name |
530 |
|
531 |
return self._StopInstance(name, force, instance.hvparams) |
532 |
|
533 |
def _StopInstance(self, name, force, hvparams): |
534 |
"""Stop an instance.
|
535 |
|
536 |
@type name: string
|
537 |
@param name: name of the instance to be shutdown
|
538 |
@type force: boolean
|
539 |
@param force: flag specifying whether shutdown should be forced
|
540 |
@type hvparams: dict of string
|
541 |
@param hvparams: hypervisor parameters of the instance
|
542 |
|
543 |
"""
|
544 |
if force:
|
545 |
action = "destroy"
|
546 |
else:
|
547 |
action = "shutdown"
|
548 |
|
549 |
result = self._RunXen([action, name], hvparams)
|
550 |
if result.failed:
|
551 |
raise errors.HypervisorError("Failed to stop instance %s: %s, %s" % |
552 |
(name, result.fail_reason, result.output)) |
553 |
|
554 |
# Remove configuration file if stopping/starting instance was successful
|
555 |
self._RemoveConfigFile(name)
|
556 |
|
557 |
def RebootInstance(self, instance): |
558 |
"""Reboot an instance.
|
559 |
|
560 |
"""
|
561 |
ini_info = self.GetInstanceInfo(instance.name, hvparams=instance.hvparams)
|
562 |
|
563 |
if ini_info is None: |
564 |
raise errors.HypervisorError("Failed to reboot instance %s," |
565 |
" not running" % instance.name)
|
566 |
|
567 |
result = self._RunXen(["reboot", instance.name], instance.hvparams) |
568 |
if result.failed:
|
569 |
raise errors.HypervisorError("Failed to reboot instance %s: %s, %s" % |
570 |
(instance.name, result.fail_reason, |
571 |
result.output)) |
572 |
|
573 |
def _CheckInstance(): |
574 |
new_info = self.GetInstanceInfo(instance.name, hvparams=instance.hvparams)
|
575 |
|
576 |
# check if the domain ID has changed or the run time has decreased
|
577 |
if (new_info is not None and |
578 |
(new_info[1] != ini_info[1] or new_info[5] < ini_info[5])): |
579 |
return
|
580 |
|
581 |
raise utils.RetryAgain()
|
582 |
|
583 |
try:
|
584 |
utils.Retry(_CheckInstance, self.REBOOT_RETRY_INTERVAL,
|
585 |
self.REBOOT_RETRY_INTERVAL * self.REBOOT_RETRY_COUNT) |
586 |
except utils.RetryTimeout:
|
587 |
raise errors.HypervisorError("Failed to reboot instance %s: instance" |
588 |
" did not reboot in the expected interval" %
|
589 |
(instance.name, )) |
590 |
|
591 |
def BalloonInstanceMemory(self, instance, mem): |
592 |
"""Balloon an instance memory to a certain value.
|
593 |
|
594 |
@type instance: L{objects.Instance}
|
595 |
@param instance: instance to be accepted
|
596 |
@type mem: int
|
597 |
@param mem: actual memory size to use for instance runtime
|
598 |
|
599 |
"""
|
600 |
result = self._RunXen(["mem-set", instance.name, mem], instance.hvparams) |
601 |
if result.failed:
|
602 |
raise errors.HypervisorError("Failed to balloon instance %s: %s (%s)" % |
603 |
(instance.name, result.fail_reason, |
604 |
result.output)) |
605 |
|
606 |
# Update configuration file
|
607 |
cmd = ["sed", "-ie", "s/^memory.*$/memory = %s/" % mem] |
608 |
cmd.append(self._ConfigFileName(instance.name))
|
609 |
|
610 |
result = utils.RunCmd(cmd) |
611 |
if result.failed:
|
612 |
raise errors.HypervisorError("Failed to update memory for %s: %s (%s)" % |
613 |
(instance.name, result.fail_reason, |
614 |
result.output)) |
615 |
|
616 |
def GetNodeInfo(self, hvparams=None): |
617 |
"""Return information about the node.
|
618 |
|
619 |
@see: L{_GetNodeInfo} and L{_ParseNodeInfo}
|
620 |
|
621 |
"""
|
622 |
result = self._RunXen(["info"], hvparams) |
623 |
if result.failed:
|
624 |
logging.error("Can't retrieve xen hypervisor information (%s): %s",
|
625 |
result.fail_reason, result.output) |
626 |
return None |
627 |
|
628 |
instance_list = self._GetInstanceList(True, hvparams) |
629 |
return _GetNodeInfo(result.stdout, instance_list)
|
630 |
|
631 |
def GetInstanceConsole(self, instance, hvparams, beparams): |
632 |
"""Return a command for connecting to the console of an instance.
|
633 |
|
634 |
"""
|
635 |
xen_cmd = self._GetCommand(hvparams)
|
636 |
return objects.InstanceConsole(instance=instance.name,
|
637 |
kind=constants.CONS_SSH, |
638 |
host=instance.primary_node, |
639 |
user=constants.SSH_CONSOLE_USER, |
640 |
command=[pathutils.XEN_CONSOLE_WRAPPER, |
641 |
xen_cmd, instance.name]) |
642 |
|
643 |
def Verify(self, hvparams=None): |
644 |
"""Verify the hypervisor.
|
645 |
|
646 |
For Xen, this verifies that the xend process is running.
|
647 |
|
648 |
@type hvparams: dict of strings
|
649 |
@param hvparams: hypervisor parameters to be verified against
|
650 |
|
651 |
@return: Problem description if something is wrong, C{None} otherwise
|
652 |
|
653 |
"""
|
654 |
if hvparams is None: |
655 |
return "Could not verify the hypervisor, because no hvparams were" \ |
656 |
" provided."
|
657 |
|
658 |
if constants.HV_XEN_CMD in hvparams: |
659 |
xen_cmd = hvparams[constants.HV_XEN_CMD] |
660 |
try:
|
661 |
self._CheckToolstack(xen_cmd)
|
662 |
except errors.HypervisorError:
|
663 |
return "The configured xen toolstack '%s' is not available on this" \ |
664 |
" node." % xen_cmd
|
665 |
|
666 |
result = self._RunXen(["info"], hvparams) |
667 |
if result.failed:
|
668 |
return "Retrieving information from xen failed: %s, %s" % \ |
669 |
(result.fail_reason, result.output) |
670 |
|
671 |
return None |
672 |
|
673 |
def MigrationInfo(self, instance): |
674 |
"""Get instance information to perform a migration.
|
675 |
|
676 |
@type instance: L{objects.Instance}
|
677 |
@param instance: instance to be migrated
|
678 |
@rtype: string
|
679 |
@return: content of the xen config file
|
680 |
|
681 |
"""
|
682 |
return self._ReadConfigFile(instance.name) |
683 |
|
684 |
def AcceptInstance(self, instance, info, target): |
685 |
"""Prepare to accept an instance.
|
686 |
|
687 |
@type instance: L{objects.Instance}
|
688 |
@param instance: instance to be accepted
|
689 |
@type info: string
|
690 |
@param info: content of the xen config file on the source node
|
691 |
@type target: string
|
692 |
@param target: target host (usually ip), on this node
|
693 |
|
694 |
"""
|
695 |
pass
|
696 |
|
697 |
def FinalizeMigrationDst(self, instance, info, success): |
698 |
"""Finalize an instance migration.
|
699 |
|
700 |
After a successful migration we write the xen config file.
|
701 |
We do nothing on a failure, as we did not change anything at accept time.
|
702 |
|
703 |
@type instance: L{objects.Instance}
|
704 |
@param instance: instance whose migration is being finalized
|
705 |
@type info: string
|
706 |
@param info: content of the xen config file on the source node
|
707 |
@type success: boolean
|
708 |
@param success: whether the migration was a success or a failure
|
709 |
|
710 |
"""
|
711 |
if success:
|
712 |
self._WriteConfigFile(instance.name, info)
|
713 |
|
714 |
def MigrateInstance(self, instance, target, live): |
715 |
"""Migrate an instance to a target node.
|
716 |
|
717 |
The migration will not be attempted if the instance is not
|
718 |
currently running.
|
719 |
|
720 |
@type instance: L{objects.Instance}
|
721 |
@param instance: the instance to be migrated
|
722 |
@type target: string
|
723 |
@param target: ip address of the target node
|
724 |
@type live: boolean
|
725 |
@param live: perform a live migration
|
726 |
|
727 |
"""
|
728 |
port = instance.hvparams[constants.HV_MIGRATION_PORT] |
729 |
|
730 |
# TODO: Pass cluster name via RPC
|
731 |
cluster_name = ssconf.SimpleStore().GetClusterName() |
732 |
|
733 |
return self._MigrateInstance(cluster_name, instance.name, target, port, |
734 |
live, instance.hvparams) |
735 |
|
736 |
def _MigrateInstance(self, cluster_name, instance_name, target, port, live, |
737 |
hvparams, _ping_fn=netutils.TcpPing): |
738 |
"""Migrate an instance to a target node.
|
739 |
|
740 |
@see: L{MigrateInstance} for details
|
741 |
|
742 |
"""
|
743 |
if hvparams is None: |
744 |
raise errors.HypervisorError("No hvparams provided.") |
745 |
|
746 |
if self.GetInstanceInfo(instance_name, hvparams=hvparams) is None: |
747 |
raise errors.HypervisorError("Instance not running, cannot migrate") |
748 |
|
749 |
cmd = self._GetCommand(hvparams)
|
750 |
|
751 |
if (cmd == constants.XEN_CMD_XM and |
752 |
not _ping_fn(target, port, live_port_needed=True)): |
753 |
raise errors.HypervisorError("Remote host %s not listening on port" |
754 |
" %s, cannot migrate" % (target, port))
|
755 |
|
756 |
args = ["migrate"]
|
757 |
|
758 |
if cmd == constants.XEN_CMD_XM:
|
759 |
args.extend(["-p", "%d" % port]) |
760 |
if live:
|
761 |
args.append("-l")
|
762 |
|
763 |
elif cmd == constants.XEN_CMD_XL:
|
764 |
args.extend([ |
765 |
"-s", constants.XL_SSH_CMD % cluster_name,
|
766 |
"-C", self._ConfigFileName(instance_name), |
767 |
]) |
768 |
|
769 |
else:
|
770 |
raise errors.HypervisorError("Unsupported Xen command: %s" % self._cmd) |
771 |
|
772 |
args.extend([instance_name, target]) |
773 |
|
774 |
result = self._RunXen(args, hvparams)
|
775 |
if result.failed:
|
776 |
raise errors.HypervisorError("Failed to migrate instance %s: %s" % |
777 |
(instance_name, result.output)) |
778 |
|
779 |
def FinalizeMigrationSource(self, instance, success, live): |
780 |
"""Finalize the instance migration on the source node.
|
781 |
|
782 |
@type instance: L{objects.Instance}
|
783 |
@param instance: the instance that was migrated
|
784 |
@type success: bool
|
785 |
@param success: whether the migration succeeded or not
|
786 |
@type live: bool
|
787 |
@param live: whether the user requested a live migration or not
|
788 |
|
789 |
"""
|
790 |
# pylint: disable=W0613
|
791 |
if success:
|
792 |
# remove old xen file after migration succeeded
|
793 |
try:
|
794 |
self._RemoveConfigFile(instance.name)
|
795 |
except EnvironmentError: |
796 |
logging.exception("Failure while removing instance config file")
|
797 |
|
798 |
def GetMigrationStatus(self, instance): |
799 |
"""Get the migration status
|
800 |
|
801 |
As MigrateInstance for Xen is still blocking, if this method is called it
|
802 |
means that MigrateInstance has completed successfully. So we can safely
|
803 |
assume that the migration was successful and notify this fact to the client.
|
804 |
|
805 |
@type instance: L{objects.Instance}
|
806 |
@param instance: the instance that is being migrated
|
807 |
@rtype: L{objects.MigrationStatus}
|
808 |
@return: the status of the current migration (one of
|
809 |
L{constants.HV_MIGRATION_VALID_STATUSES}), plus any additional
|
810 |
progress info that can be retrieved from the hypervisor
|
811 |
|
812 |
"""
|
813 |
return objects.MigrationStatus(status=constants.HV_MIGRATION_COMPLETED)
|
814 |
|
815 |
def PowercycleNode(self, hvparams=None): |
816 |
"""Xen-specific powercycle.
|
817 |
|
818 |
This first does a Linux reboot (which triggers automatically a Xen
|
819 |
reboot), and if that fails it tries to do a Xen reboot. The reason
|
820 |
we don't try a Xen reboot first is that the xen reboot launches an
|
821 |
external command which connects to the Xen hypervisor, and that
|
822 |
won't work in case the root filesystem is broken and/or the xend
|
823 |
daemon is not working.
|
824 |
|
825 |
@type hvparams: dict of strings
|
826 |
@param hvparams: hypervisor params to be used on this node
|
827 |
|
828 |
"""
|
829 |
try:
|
830 |
self.LinuxPowercycle()
|
831 |
finally:
|
832 |
xen_cmd = self._GetCommand(hvparams)
|
833 |
utils.RunCmd([xen_cmd, "debug", "R"]) |
834 |
|
835 |
def _CheckToolstack(self, xen_cmd): |
836 |
"""Check whether the given toolstack is available on the node.
|
837 |
|
838 |
@type xen_cmd: string
|
839 |
@param xen_cmd: xen command (e.g. 'xm' or 'xl')
|
840 |
|
841 |
"""
|
842 |
binary_found = self._CheckToolstackBinary(xen_cmd)
|
843 |
if not binary_found: |
844 |
raise errors.HypervisorError("No '%s' binary found on node." % xen_cmd) |
845 |
elif xen_cmd == constants.XEN_CMD_XL:
|
846 |
if not self._CheckToolstackXlConfigured(): |
847 |
raise errors.HypervisorError("Toolstack '%s' is not enabled on this" |
848 |
"node." % xen_cmd)
|
849 |
|
850 |
def _CheckToolstackBinary(self, xen_cmd): |
851 |
"""Checks whether the xen command's binary is found on the machine.
|
852 |
|
853 |
"""
|
854 |
if xen_cmd not in constants.KNOWN_XEN_COMMANDS: |
855 |
raise errors.HypervisorError("Unknown xen command '%s'." % xen_cmd) |
856 |
result = self._run_cmd_fn(["which", xen_cmd]) |
857 |
return not result.failed |
858 |
|
859 |
def _CheckToolstackXlConfigured(self): |
860 |
"""Checks whether xl is enabled on an xl-capable node.
|
861 |
|
862 |
@rtype: bool
|
863 |
@returns: C{True} if 'xl' is enabled, C{False} otherwise
|
864 |
|
865 |
"""
|
866 |
result = self._run_cmd_fn([constants.XEN_CMD_XL, "help"]) |
867 |
if not result.failed: |
868 |
return True |
869 |
elif result.failed:
|
870 |
if "toolstack" in result.stderr: |
871 |
return False |
872 |
# xl fails for some other reason than the toolstack
|
873 |
else:
|
874 |
raise errors.HypervisorError("Cannot run xen ('%s'). Error: %s." |
875 |
% (constants.XEN_CMD_XL, result.stderr)) |
876 |
|
877 |
|
878 |
class XenPvmHypervisor(XenHypervisor): |
879 |
"""Xen PVM hypervisor interface"""
|
880 |
|
881 |
PARAMETERS = { |
882 |
constants.HV_USE_BOOTLOADER: hv_base.NO_CHECK, |
883 |
constants.HV_BOOTLOADER_PATH: hv_base.OPT_FILE_CHECK, |
884 |
constants.HV_BOOTLOADER_ARGS: hv_base.NO_CHECK, |
885 |
constants.HV_KERNEL_PATH: hv_base.REQ_FILE_CHECK, |
886 |
constants.HV_INITRD_PATH: hv_base.OPT_FILE_CHECK, |
887 |
constants.HV_ROOT_PATH: hv_base.NO_CHECK, |
888 |
constants.HV_KERNEL_ARGS: hv_base.NO_CHECK, |
889 |
constants.HV_MIGRATION_PORT: hv_base.REQ_NET_PORT_CHECK, |
890 |
constants.HV_MIGRATION_MODE: hv_base.MIGRATION_MODE_CHECK, |
891 |
# TODO: Add a check for the blockdev prefix (matching [a-z:] or similar).
|
892 |
constants.HV_BLOCKDEV_PREFIX: hv_base.NO_CHECK, |
893 |
constants.HV_REBOOT_BEHAVIOR: |
894 |
hv_base.ParamInSet(True, constants.REBOOT_BEHAVIORS),
|
895 |
constants.HV_CPU_MASK: hv_base.OPT_MULTI_CPU_MASK_CHECK, |
896 |
constants.HV_CPU_CAP: hv_base.OPT_NONNEGATIVE_INT_CHECK, |
897 |
constants.HV_CPU_WEIGHT: |
898 |
(False, lambda x: 0 < x < 65536, "invalid weight", None, None), |
899 |
constants.HV_XEN_CMD: |
900 |
hv_base.ParamInSet(True, constants.KNOWN_XEN_COMMANDS),
|
901 |
} |
902 |
|
903 |
def _GetConfig(self, instance, startup_memory, block_devices): |
904 |
"""Write the Xen config file for the instance.
|
905 |
|
906 |
"""
|
907 |
hvp = instance.hvparams |
908 |
config = StringIO() |
909 |
config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
|
910 |
|
911 |
# if bootloader is True, use bootloader instead of kernel and ramdisk
|
912 |
# parameters.
|
913 |
if hvp[constants.HV_USE_BOOTLOADER]:
|
914 |
# bootloader handling
|
915 |
bootloader_path = hvp[constants.HV_BOOTLOADER_PATH] |
916 |
if bootloader_path:
|
917 |
config.write("bootloader = '%s'\n" % bootloader_path)
|
918 |
else:
|
919 |
raise errors.HypervisorError("Bootloader enabled, but missing" |
920 |
" bootloader path")
|
921 |
|
922 |
bootloader_args = hvp[constants.HV_BOOTLOADER_ARGS] |
923 |
if bootloader_args:
|
924 |
config.write("bootargs = '%s'\n" % bootloader_args)
|
925 |
else:
|
926 |
# kernel handling
|
927 |
kpath = hvp[constants.HV_KERNEL_PATH] |
928 |
config.write("kernel = '%s'\n" % kpath)
|
929 |
|
930 |
# initrd handling
|
931 |
initrd_path = hvp[constants.HV_INITRD_PATH] |
932 |
if initrd_path:
|
933 |
config.write("ramdisk = '%s'\n" % initrd_path)
|
934 |
|
935 |
# rest of the settings
|
936 |
config.write("memory = %d\n" % startup_memory)
|
937 |
config.write("maxmem = %d\n" % instance.beparams[constants.BE_MAXMEM])
|
938 |
config.write("vcpus = %d\n" % instance.beparams[constants.BE_VCPUS])
|
939 |
cpu_pinning = _CreateConfigCpus(hvp[constants.HV_CPU_MASK]) |
940 |
if cpu_pinning:
|
941 |
config.write("%s\n" % cpu_pinning)
|
942 |
cpu_cap = hvp[constants.HV_CPU_CAP] |
943 |
if cpu_cap:
|
944 |
config.write("cpu_cap=%d\n" % cpu_cap)
|
945 |
cpu_weight = hvp[constants.HV_CPU_WEIGHT] |
946 |
if cpu_weight:
|
947 |
config.write("cpu_weight=%d\n" % cpu_weight)
|
948 |
|
949 |
config.write("name = '%s'\n" % instance.name)
|
950 |
|
951 |
vif_data = [] |
952 |
for nic in instance.nics: |
953 |
nic_str = "mac=%s" % (nic.mac)
|
954 |
ip = getattr(nic, "ip", None) |
955 |
if ip is not None: |
956 |
nic_str += ", ip=%s" % ip
|
957 |
if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
|
958 |
nic_str += ", bridge=%s" % nic.nicparams[constants.NIC_LINK]
|
959 |
vif_data.append("'%s'" % nic_str)
|
960 |
|
961 |
disk_data = \ |
962 |
_GetConfigFileDiskData(block_devices, hvp[constants.HV_BLOCKDEV_PREFIX]) |
963 |
|
964 |
config.write("vif = [%s]\n" % ",".join(vif_data)) |
965 |
config.write("disk = [%s]\n" % ",".join(disk_data)) |
966 |
|
967 |
if hvp[constants.HV_ROOT_PATH]:
|
968 |
config.write("root = '%s'\n" % hvp[constants.HV_ROOT_PATH])
|
969 |
config.write("on_poweroff = 'destroy'\n")
|
970 |
if hvp[constants.HV_REBOOT_BEHAVIOR] == constants.INSTANCE_REBOOT_ALLOWED:
|
971 |
config.write("on_reboot = 'restart'\n")
|
972 |
else:
|
973 |
config.write("on_reboot = 'destroy'\n")
|
974 |
config.write("on_crash = 'restart'\n")
|
975 |
config.write("extra = '%s'\n" % hvp[constants.HV_KERNEL_ARGS])
|
976 |
|
977 |
return config.getvalue()
|
978 |
|
979 |
|
980 |
class XenHvmHypervisor(XenHypervisor): |
981 |
"""Xen HVM hypervisor interface"""
|
982 |
|
983 |
ANCILLARY_FILES = XenHypervisor.ANCILLARY_FILES + [ |
984 |
pathutils.VNC_PASSWORD_FILE, |
985 |
] |
986 |
ANCILLARY_FILES_OPT = XenHypervisor.ANCILLARY_FILES_OPT + [ |
987 |
pathutils.VNC_PASSWORD_FILE, |
988 |
] |
989 |
|
990 |
PARAMETERS = { |
991 |
constants.HV_ACPI: hv_base.NO_CHECK, |
992 |
constants.HV_BOOT_ORDER: (True, ) +
|
993 |
(lambda x: x and len(x.strip("acdn")) == 0, |
994 |
"Invalid boot order specified, must be one or more of [acdn]",
|
995 |
None, None), |
996 |
constants.HV_CDROM_IMAGE_PATH: hv_base.OPT_FILE_CHECK, |
997 |
constants.HV_DISK_TYPE: |
998 |
hv_base.ParamInSet(True, constants.HT_HVM_VALID_DISK_TYPES),
|
999 |
constants.HV_NIC_TYPE: |
1000 |
hv_base.ParamInSet(True, constants.HT_HVM_VALID_NIC_TYPES),
|
1001 |
constants.HV_PAE: hv_base.NO_CHECK, |
1002 |
constants.HV_VNC_BIND_ADDRESS: |
1003 |
(False, netutils.IP4Address.IsValid,
|
1004 |
"VNC bind address is not a valid IP address", None, None), |
1005 |
constants.HV_KERNEL_PATH: hv_base.REQ_FILE_CHECK, |
1006 |
constants.HV_DEVICE_MODEL: hv_base.REQ_FILE_CHECK, |
1007 |
constants.HV_VNC_PASSWORD_FILE: hv_base.REQ_FILE_CHECK, |
1008 |
constants.HV_MIGRATION_PORT: hv_base.REQ_NET_PORT_CHECK, |
1009 |
constants.HV_MIGRATION_MODE: hv_base.MIGRATION_MODE_CHECK, |
1010 |
constants.HV_USE_LOCALTIME: hv_base.NO_CHECK, |
1011 |
# TODO: Add a check for the blockdev prefix (matching [a-z:] or similar).
|
1012 |
constants.HV_BLOCKDEV_PREFIX: hv_base.NO_CHECK, |
1013 |
# Add PCI passthrough
|
1014 |
constants.HV_PASSTHROUGH: hv_base.NO_CHECK, |
1015 |
constants.HV_REBOOT_BEHAVIOR: |
1016 |
hv_base.ParamInSet(True, constants.REBOOT_BEHAVIORS),
|
1017 |
constants.HV_CPU_MASK: hv_base.OPT_MULTI_CPU_MASK_CHECK, |
1018 |
constants.HV_CPU_CAP: hv_base.NO_CHECK, |
1019 |
constants.HV_CPU_WEIGHT: |
1020 |
(False, lambda x: 0 < x < 65535, "invalid weight", None, None), |
1021 |
constants.HV_VIF_TYPE: |
1022 |
hv_base.ParamInSet(False, constants.HT_HVM_VALID_VIF_TYPES),
|
1023 |
constants.HV_XEN_CMD: |
1024 |
hv_base.ParamInSet(True, constants.KNOWN_XEN_COMMANDS),
|
1025 |
} |
1026 |
|
1027 |
def _GetConfig(self, instance, startup_memory, block_devices): |
1028 |
"""Create a Xen 3.1 HVM config file.
|
1029 |
|
1030 |
"""
|
1031 |
hvp = instance.hvparams |
1032 |
|
1033 |
config = StringIO() |
1034 |
|
1035 |
# kernel handling
|
1036 |
kpath = hvp[constants.HV_KERNEL_PATH] |
1037 |
config.write("kernel = '%s'\n" % kpath)
|
1038 |
|
1039 |
config.write("builder = 'hvm'\n")
|
1040 |
config.write("memory = %d\n" % startup_memory)
|
1041 |
config.write("maxmem = %d\n" % instance.beparams[constants.BE_MAXMEM])
|
1042 |
config.write("vcpus = %d\n" % instance.beparams[constants.BE_VCPUS])
|
1043 |
cpu_pinning = _CreateConfigCpus(hvp[constants.HV_CPU_MASK]) |
1044 |
if cpu_pinning:
|
1045 |
config.write("%s\n" % cpu_pinning)
|
1046 |
cpu_cap = hvp[constants.HV_CPU_CAP] |
1047 |
if cpu_cap:
|
1048 |
config.write("cpu_cap=%d\n" % cpu_cap)
|
1049 |
cpu_weight = hvp[constants.HV_CPU_WEIGHT] |
1050 |
if cpu_weight:
|
1051 |
config.write("cpu_weight=%d\n" % cpu_weight)
|
1052 |
|
1053 |
config.write("name = '%s'\n" % instance.name)
|
1054 |
if hvp[constants.HV_PAE]:
|
1055 |
config.write("pae = 1\n")
|
1056 |
else:
|
1057 |
config.write("pae = 0\n")
|
1058 |
if hvp[constants.HV_ACPI]:
|
1059 |
config.write("acpi = 1\n")
|
1060 |
else:
|
1061 |
config.write("acpi = 0\n")
|
1062 |
config.write("apic = 1\n")
|
1063 |
config.write("device_model = '%s'\n" % hvp[constants.HV_DEVICE_MODEL])
|
1064 |
config.write("boot = '%s'\n" % hvp[constants.HV_BOOT_ORDER])
|
1065 |
config.write("sdl = 0\n")
|
1066 |
config.write("usb = 1\n")
|
1067 |
config.write("usbdevice = 'tablet'\n")
|
1068 |
config.write("vnc = 1\n")
|
1069 |
if hvp[constants.HV_VNC_BIND_ADDRESS] is None: |
1070 |
config.write("vnclisten = '%s'\n" % constants.VNC_DEFAULT_BIND_ADDRESS)
|
1071 |
else:
|
1072 |
config.write("vnclisten = '%s'\n" % hvp[constants.HV_VNC_BIND_ADDRESS])
|
1073 |
|
1074 |
if instance.network_port > constants.VNC_BASE_PORT:
|
1075 |
display = instance.network_port - constants.VNC_BASE_PORT |
1076 |
config.write("vncdisplay = %s\n" % display)
|
1077 |
config.write("vncunused = 0\n")
|
1078 |
else:
|
1079 |
config.write("# vncdisplay = 1\n")
|
1080 |
config.write("vncunused = 1\n")
|
1081 |
|
1082 |
vnc_pwd_file = hvp[constants.HV_VNC_PASSWORD_FILE] |
1083 |
try:
|
1084 |
password = utils.ReadFile(vnc_pwd_file) |
1085 |
except EnvironmentError, err: |
1086 |
raise errors.HypervisorError("Failed to open VNC password file %s: %s" % |
1087 |
(vnc_pwd_file, err)) |
1088 |
|
1089 |
config.write("vncpasswd = '%s'\n" % password.rstrip())
|
1090 |
|
1091 |
config.write("serial = 'pty'\n")
|
1092 |
if hvp[constants.HV_USE_LOCALTIME]:
|
1093 |
config.write("localtime = 1\n")
|
1094 |
|
1095 |
vif_data = [] |
1096 |
# Note: what is called 'nic_type' here, is used as value for the xen nic
|
1097 |
# vif config parameter 'model'. For the xen nic vif parameter 'type', we use
|
1098 |
# the 'vif_type' to avoid a clash of notation.
|
1099 |
nic_type = hvp[constants.HV_NIC_TYPE] |
1100 |
|
1101 |
if nic_type is None: |
1102 |
vif_type_str = ""
|
1103 |
if hvp[constants.HV_VIF_TYPE]:
|
1104 |
vif_type_str = ", type=%s" % hvp[constants.HV_VIF_TYPE]
|
1105 |
# ensure old instances don't change
|
1106 |
nic_type_str = vif_type_str |
1107 |
elif nic_type == constants.HT_NIC_PARAVIRTUAL:
|
1108 |
nic_type_str = ", type=paravirtualized"
|
1109 |
else:
|
1110 |
# parameter 'model' is only valid with type 'ioemu'
|
1111 |
nic_type_str = ", model=%s, type=%s" % \
|
1112 |
(nic_type, constants.HT_HVM_VIF_IOEMU) |
1113 |
for nic in instance.nics: |
1114 |
nic_str = "mac=%s%s" % (nic.mac, nic_type_str)
|
1115 |
ip = getattr(nic, "ip", None) |
1116 |
if ip is not None: |
1117 |
nic_str += ", ip=%s" % ip
|
1118 |
if nic.nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
|
1119 |
nic_str += ", bridge=%s" % nic.nicparams[constants.NIC_LINK]
|
1120 |
vif_data.append("'%s'" % nic_str)
|
1121 |
|
1122 |
config.write("vif = [%s]\n" % ",".join(vif_data)) |
1123 |
|
1124 |
disk_data = \ |
1125 |
_GetConfigFileDiskData(block_devices, hvp[constants.HV_BLOCKDEV_PREFIX]) |
1126 |
|
1127 |
iso_path = hvp[constants.HV_CDROM_IMAGE_PATH] |
1128 |
if iso_path:
|
1129 |
iso = "'file:%s,hdc:cdrom,r'" % iso_path
|
1130 |
disk_data.append(iso) |
1131 |
|
1132 |
config.write("disk = [%s]\n" % (",".join(disk_data))) |
1133 |
# Add PCI passthrough
|
1134 |
pci_pass_arr = [] |
1135 |
pci_pass = hvp[constants.HV_PASSTHROUGH] |
1136 |
if pci_pass:
|
1137 |
pci_pass_arr = pci_pass.split(";")
|
1138 |
config.write("pci = %s\n" % pci_pass_arr)
|
1139 |
config.write("on_poweroff = 'destroy'\n")
|
1140 |
if hvp[constants.HV_REBOOT_BEHAVIOR] == constants.INSTANCE_REBOOT_ALLOWED:
|
1141 |
config.write("on_reboot = 'restart'\n")
|
1142 |
else:
|
1143 |
config.write("on_reboot = 'destroy'\n")
|
1144 |
config.write("on_crash = 'restart'\n")
|
1145 |
|
1146 |
return config.getvalue()
|