root / lib / hypervisor.py @ 4a72cc75
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#!/usr/bin/python
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#
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module that abstracts the virtualisation interface
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"""
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import time |
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import os |
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from cStringIO import StringIO |
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from ganeti import utils |
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from ganeti import logger |
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from ganeti import ssconf |
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from ganeti.errors import HypervisorError |
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_HT_XEN30 = "xen-3.0"
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_HT_FAKE = "fake"
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VALID_HTYPES = (_HT_XEN30, _HT_FAKE) |
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def GetHypervisor(): |
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"""Return a Hypervisor instance.
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This function parses the cluster hypervisor configuration file and
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instantiates a class based on the value of this file.
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"""
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ht_kind = ssconf.SimpleStore().GetHypervisorType() |
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if ht_kind == _HT_XEN30:
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cls = XenHypervisor |
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elif ht_kind == _HT_FAKE:
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cls = FakeHypervisor |
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else:
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raise HypervisorError("Unknown hypervisor type '%s'" % ht_kind) |
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return cls()
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class BaseHypervisor(object): |
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"""Abstract virtualisation technology interface
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The goal is that all aspects of the virtualisation technology must
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be abstracted away from the rest of code.
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"""
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def __init__(self): |
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pass
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def StartInstance(self, instance, block_devices, extra_args): |
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"""Start an instance."""
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raise NotImplementedError |
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def StopInstance(self, instance, force=False): |
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"""Stop an instance."""
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raise NotImplementedError |
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def ListInstances(self): |
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"""Get the list of running instances."""
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raise NotImplementedError |
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def GetInstanceInfo(self, instance_name): |
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"""Get instance properties.
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Args:
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instance_name: the instance name
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Returns:
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(name, id, memory, vcpus, state, times)
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"""
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raise NotImplementedError |
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def GetAllInstancesInfo(self): |
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"""Get properties of all instances.
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Returns:
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[(name, id, memory, vcpus, stat, times),...]
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"""
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raise NotImplementedError |
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def GetNodeInfo(self): |
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"""Return information about the node.
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The return value is a dict, which has to have the following items:
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(all values in MiB)
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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raise NotImplementedError |
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@staticmethod
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def GetShellCommandForConsole(instance_name): |
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"""Return a command for connecting to the console of an instance.
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"""
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raise NotImplementedError |
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def Verify(self): |
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"""Verify the hypervisor.
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"""
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raise NotImplementedError |
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class XenHypervisor(BaseHypervisor): |
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"""Xen hypervisor interface"""
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@staticmethod
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def _WriteConfigFile(instance, block_devices, extra_args): |
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"""Create a Xen 3.0 config file.
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"""
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config = StringIO() |
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config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")
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config.write("kernel = '/boot/vmlinuz-2.6-xenU'\n")
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if os.path.exists("/boot/initrd-2.6-xenU"): |
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config.write("ramdisk = '/boot/initrd-2.6-xenU'\n")
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config.write("memory = %d\n" % instance.memory)
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config.write("vcpus = %d\n" % instance.vcpus)
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config.write("name = '%s'\n" % instance.name)
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vif_data = [] |
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for nic in instance.nics: |
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nic_str = "mac=%s, bridge=%s" % (nic.mac, nic.bridge)
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ip = getattr(nic, "ip", None) |
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if ip is not None: |
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nic_str += ", ip=%s" % ip
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vif_data.append("'%s'" % nic_str)
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config.write("vif = [%s]\n" % ",".join(vif_data)) |
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disk_data = ["'phy:%s,%s,w'" % (rldev.dev_path, cfdev.iv_name)
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for cfdev, rldev in block_devices] |
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config.write("disk = [%s]\n" % ",".join(disk_data)) |
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config.write("root = '/dev/sda ro'\n")
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config.write("on_poweroff = 'destroy'\n")
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config.write("on_reboot = 'restart'\n")
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config.write("on_crash = 'restart'\n")
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if extra_args:
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config.write("extra = '%s'\n" % extra_args)
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# just in case it exists
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utils.RemoveFile("/etc/xen/auto/%s" % instance.name)
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f = open("/etc/xen/%s" % instance.name, "w") |
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f.write(config.getvalue()) |
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f.close() |
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return True |
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@staticmethod
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def _RemoveConfigFile(instance): |
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"""Remove the xen configuration file.
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"""
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utils.RemoveFile("/etc/xen/%s" % instance.name)
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@staticmethod
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def _GetXMList(include_node): |
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"""Return the list of running instances.
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If the `include_node` argument is True, then we return information
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for dom0 also, otherwise we filter that from the return value.
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The return value is a list of (name, id, memory, vcpus, state, time spent)
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"""
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for dummy in range(5): |
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result = utils.RunCmd(["xm", "list"]) |
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if not result.failed: |
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break
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logger.Error("xm list failed (%s): %s" % (result.fail_reason,
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result.output)) |
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time.sleep(1)
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if result.failed:
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raise HypervisorError("xm list failed, retries exceeded (%s): %s" % |
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(result.fail_reason, result.stderr)) |
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# skip over the heading and the domain 0 line (optional)
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if include_node:
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to_skip = 1
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else:
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to_skip = 2
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lines = result.stdout.splitlines()[to_skip:] |
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result = [] |
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for line in lines: |
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# The format of lines is:
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# Name ID Mem(MiB) VCPUs State Time(s)
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# Domain-0 0 3418 4 r----- 266.2
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data = line.split() |
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if len(data) != 6: |
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raise HypervisorError("Can't parse output of xm list, line: %s" % line) |
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try:
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data[1] = int(data[1]) |
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data[2] = int(data[2]) |
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data[3] = int(data[3]) |
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data[5] = float(data[5]) |
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except ValueError, err: |
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raise HypervisorError("Can't parse output of xm list," |
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" line: %s, error: %s" % (line, err))
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result.append(data) |
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return result
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def ListInstances(self): |
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"""Get the list of running instances.
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"""
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xm_list = self._GetXMList(False) |
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names = [info[0] for info in xm_list] |
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return names
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def GetInstanceInfo(self, instance_name): |
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"""Get instance properties.
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Args:
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instance_name: the instance name
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Returns:
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(name, id, memory, vcpus, stat, times)
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"""
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xm_list = self._GetXMList(instance_name=="Domain-0") |
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result = None
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for data in xm_list: |
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if data[0] == instance_name: |
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result = data |
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break
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return result
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def GetAllInstancesInfo(self): |
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"""Get properties of all instances.
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Returns:
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[(name, id, memory, vcpus, stat, times),...]
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"""
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xm_list = self._GetXMList(False) |
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return xm_list
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def StartInstance(self, instance, block_devices, extra_args): |
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"""Start an instance."""
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self._WriteConfigFile(instance, block_devices, extra_args)
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result = utils.RunCmd(["xm", "create", instance.name]) |
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if result.failed:
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raise HypervisorError("Failed to start instance %s: %s" % |
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(instance.name, result.fail_reason)) |
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def StopInstance(self, instance, force=False): |
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"""Stop an instance."""
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self._RemoveConfigFile(instance)
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if force:
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command = ["xm", "destroy", instance.name] |
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else:
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command = ["xm", "shutdown", instance.name] |
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result = utils.RunCmd(command) |
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if result.failed:
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raise HypervisorError("Failed to stop instance %s: %s" % |
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(instance.name, result.fail_reason)) |
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def GetNodeInfo(self): |
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"""Return information about the node.
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The return value is a dict, which has to have the following items:
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(all values in MiB)
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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# note: in xen 3, memory has changed to total_memory
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result = utils.RunCmd(["xm", "info"]) |
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if result.failed:
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logger.Error("Can't run 'xm info': %s" % result.fail_reason)
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return None |
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xmoutput = result.stdout.splitlines() |
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result = {} |
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for line in xmoutput: |
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splitfields = line.split(":", 1) |
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if len(splitfields) > 1: |
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key = splitfields[0].strip()
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val = splitfields[1].strip()
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if key == 'memory' or key == 'total_memory': |
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result['memory_total'] = int(val) |
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elif key == 'free_memory': |
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result['memory_free'] = int(val) |
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dom0_info = self.GetInstanceInfo("Domain-0") |
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if dom0_info is not None: |
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result['memory_dom0'] = dom0_info[2] |
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return result
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@staticmethod
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def GetShellCommandForConsole(instance_name): |
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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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if not utils.CheckDaemonAlive('/var/run/xend.pid', 'xend'): |
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return "xend daemon is not running" |
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class FakeHypervisor(BaseHypervisor): |
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"""Fake hypervisor interface.
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This can be used for testing the ganeti code without having to have
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a real virtualisation software installed.
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"""
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_ROOT_DIR = "/var/run/ganeti-fake-hypervisor"
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def __init__(self): |
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BaseHypervisor.__init__(self)
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if not os.path.exists(self._ROOT_DIR): |
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os.mkdir(self._ROOT_DIR)
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def ListInstances(self): |
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"""Get the list of running instances.
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"""
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return os.listdir(self._ROOT_DIR) |
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def GetInstanceInfo(self, instance_name): |
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"""Get instance properties.
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Args:
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instance_name: the instance name
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Returns:
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(name, id, memory, vcpus, stat, times)
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"""
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file_name = "%s/%s" % (self._ROOT_DIR, instance_name) |
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if not os.path.exists(file_name): |
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return None |
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try:
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fh = file(file_name, "r") |
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try:
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inst_id = fh.readline().strip() |
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memory = fh.readline().strip() |
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vcpus = fh.readline().strip() |
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stat = "---b-"
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times = "0"
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return (instance_name, inst_id, memory, vcpus, stat, times)
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finally:
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fh.close() |
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except IOError, err: |
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raise HypervisorError("Failed to list instance %s: %s" % |
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(instance_name, err)) |
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def GetAllInstancesInfo(self): |
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"""Get properties of all instances.
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Returns:
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[(name, id, memory, vcpus, stat, times),...]
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"""
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data = [] |
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for file_name in os.listdir(self._ROOT_DIR): |
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try:
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fh = file(self._ROOT_DIR+"/"+file_name, "r") |
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inst_id = "-1"
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memory = "0"
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stat = "-----"
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times = "-1"
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try:
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inst_id = fh.readline().strip() |
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memory = fh.readline().strip() |
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vcpus = fh.readline().strip() |
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stat = "---b-"
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times = "0"
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finally:
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fh.close() |
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data.append((file_name, inst_id, memory, vcpus, stat, times)) |
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except IOError, err: |
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raise HypervisorError("Failed to list instances: %s" % err) |
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return data
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def StartInstance(self, instance, force, extra_args): |
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"""Start an instance.
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For the fake hypervisor, it just creates a file in the base dir,
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creating an exception if it already exists. We don't actually
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handle race conditions properly, since these are *FAKE* instances.
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"""
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file_name = self._ROOT_DIR + "/%s" % instance.name |
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if os.path.exists(file_name):
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raise HypervisorError("Failed to start instance %s: %s" % |
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(instance.name, "already running"))
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try:
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fh = file(file_name, "w") |
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try:
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fh.write("0\n%d\n%d\n" % (instance.memory, instance.vcpus))
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finally:
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fh.close() |
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except IOError, err: |
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raise HypervisorError("Failed to start instance %s: %s" % |
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(instance.name, err)) |
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def StopInstance(self, instance, force=False): |
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"""Stop an instance.
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For the fake hypervisor, this just removes the file in the base
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dir, if it exist, otherwise we raise an exception.
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"""
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file_name = self._ROOT_DIR + "/%s" % instance.name |
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if not os.path.exists(file_name): |
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raise HypervisorError("Failed to stop instance %s: %s" % |
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(instance.name, "not running"))
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utils.RemoveFile(file_name) |
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def GetNodeInfo(self): |
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"""Return information about the node.
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The return value is a dict, which has to have the following items:
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(all values in MiB)
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- memory_total: the total memory size on the node
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- memory_free: the available memory on the node for instances
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- memory_dom0: the memory used by the node itself, if available
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"""
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# global ram usage from the xm info command
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# memory : 3583
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# free_memory : 747
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# note: in xen 3, memory has changed to total_memory
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try:
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fh = file("/proc/meminfo") |
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try:
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data = fh.readlines() |
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finally:
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fh.close() |
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except IOError, err: |
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raise HypervisorError("Failed to list node info: %s" % err) |
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result = {} |
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sum_free = 0
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for line in data: |
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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 == 'MemTotal': |
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result['memory_total'] = int(val.split()[0])/1024 |
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elif key in ('MemFree', 'Buffers', 'Cached'): |
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sum_free += int(val.split()[0])/1024 |
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elif key == 'Active': |
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result['memory_dom0'] = int(val.split()[0])/1024 |
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result['memory_free'] = sum_free
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return result
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@staticmethod
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def GetShellCommandForConsole(instance_name): |
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"""Return a command for connecting to the console of an instance.
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"""
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return "echo Console not available for fake hypervisor" |
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def Verify(self): |
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"""Verify the hypervisor.
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For the fake hypervisor, it just checks the existence of the base
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dir.
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"""
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if not os.path.exists(self._ROOT_DIR): |
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return "The required directory '%s' does not exist." % self._ROOT_DIR |