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#!/usr/bin/python |
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# |
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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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|
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|
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"""Ganeti node daemon""" |
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|
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# functions in this module need to have a given name structure, so: |
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# pylint: disable-msg=C0103 |
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|
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import os |
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import sys |
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import resource |
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import traceback |
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|
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from optparse import OptionParser |
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|
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|
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from ganeti import backend |
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from ganeti import logger |
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from ganeti import constants |
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from ganeti import objects |
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from ganeti import errors |
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from ganeti import ssconf |
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|
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from twisted.spread import pb |
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from twisted.internet import reactor |
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from twisted.cred import checkers, portal |
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from OpenSSL import SSL |
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|
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|
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class ServerContextFactory: |
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"""SSL context factory class that uses a given certificate. |
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|
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""" |
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@staticmethod |
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def getContext(): |
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"""Return a customized context. |
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|
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The context will be set to use our certificate. |
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|
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""" |
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ctx = SSL.Context(SSL.TLSv1_METHOD) |
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ctx.use_certificate_file(constants.SSL_CERT_FILE) |
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ctx.use_privatekey_file(constants.SSL_CERT_FILE) |
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return ctx |
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|
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class ServerObject(pb.Avatar): |
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"""The server implementation. |
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|
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This class holds all methods exposed over the RPC interface. |
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|
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""" |
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def __init__(self, name): |
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self.name = name |
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|
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def perspectiveMessageReceived(self, broker, message, args, kw): |
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"""Custom message dispatching function. |
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|
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This function overrides the pb.Avatar function in order to provide |
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a simple form of exception passing (as text only). |
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|
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""" |
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args = broker.unserialize(args, self) |
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kw = broker.unserialize(kw, self) |
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method = getattr(self, "perspective_%s" % message) |
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tb = None |
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state = None |
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try: |
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state = method(*args, **kw) |
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except: |
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tb = traceback.format_exc() |
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|
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return broker.serialize((tb, state), self, method, args, kw) |
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|
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# the new block devices -------------------------- |
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|
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@staticmethod |
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def perspective_blockdev_create(params): |
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"""Create a block device. |
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|
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""" |
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bdev_s, size, on_primary, info = params |
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bdev = objects.ConfigObject.Loads(bdev_s) |
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if bdev is None: |
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raise ValueError("can't unserialize data!") |
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return backend.CreateBlockDevice(bdev, size, on_primary, info) |
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|
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@staticmethod |
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def perspective_blockdev_remove(params): |
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"""Remove a block device. |
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|
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""" |
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bdev_s = params[0] |
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bdev = objects.ConfigObject.Loads(bdev_s) |
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return backend.RemoveBlockDevice(bdev) |
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|
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@staticmethod |
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def perspective_blockdev_assemble(params): |
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"""Assemble a block device. |
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|
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""" |
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bdev_s, on_primary = params |
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bdev = objects.ConfigObject.Loads(bdev_s) |
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if bdev is None: |
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raise ValueError("can't unserialize data!") |
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return backend.AssembleBlockDevice(bdev, on_primary) |
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|
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@staticmethod |
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def perspective_blockdev_shutdown(params): |
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"""Shutdown a block device. |
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|
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""" |
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bdev_s = params[0] |
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bdev = objects.ConfigObject.Loads(bdev_s) |
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if bdev is None: |
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raise ValueError("can't unserialize data!") |
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return backend.ShutdownBlockDevice(bdev) |
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|
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@staticmethod |
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def perspective_blockdev_addchild(params): |
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"""Add a child to a mirror device. |
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|
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Note: this is only valid for mirror devices. It's the caller's duty |
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to send a correct disk, otherwise we raise an error. |
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|
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""" |
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bdev_s, ndev_s = params |
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bdev = objects.ConfigObject.Loads(bdev_s) |
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ndev = objects.ConfigObject.Loads(ndev_s) |
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if bdev is None or ndev is None: |
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raise ValueError("can't unserialize data!") |
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return backend.MirrorAddChild(bdev, ndev) |
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|
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@staticmethod |
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def perspective_blockdev_removechild(params): |
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"""Remove a child from a mirror device. |
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|
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This is only valid for mirror devices, of course. It's the callers |
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duty to send a correct disk, otherwise we raise an error. |
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|
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""" |
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bdev_s, ndev_s = params |
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bdev = objects.ConfigObject.Loads(bdev_s) |
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ndev = objects.ConfigObject.Loads(ndev_s) |
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if bdev is None or ndev is None: |
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raise ValueError("can't unserialize data!") |
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return backend.MirrorRemoveChild(bdev, ndev) |
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|
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@staticmethod |
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def perspective_blockdev_getmirrorstatus(params): |
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"""Return the mirror status for a list of disks. |
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|
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""" |
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disks = [objects.ConfigObject.Loads(dsk_s) |
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for dsk_s in params] |
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return backend.GetMirrorStatus(disks) |
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|
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@staticmethod |
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def perspective_blockdev_find(params): |
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"""Expose the FindBlockDevice functionality for a disk. |
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|
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This will try to find but not activate a disk. |
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|
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""" |
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disk = objects.ConfigObject.Loads(params[0]) |
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return backend.FindBlockDevice(disk) |
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|
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@staticmethod |
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def perspective_blockdev_snapshot(params): |
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"""Create a snapshot device. |
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|
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Note that this is only valid for LVM disks, if we get passed |
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something else we raise an exception. The snapshot device can be |
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remove by calling the generic block device remove call. |
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|
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""" |
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cfbd = objects.ConfigObject.Loads(params[0]) |
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return backend.SnapshotBlockDevice(cfbd) |
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|
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# export/import -------------------------- |
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|
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@staticmethod |
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def perspective_snapshot_export(params): |
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"""Export a given snapshot. |
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|
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""" |
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disk = objects.ConfigObject.Loads(params[0]) |
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dest_node = params[1] |
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instance = objects.ConfigObject.Loads(params[2]) |
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return backend.ExportSnapshot(disk, dest_node, instance) |
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|
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@staticmethod |
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def perspective_finalize_export(params): |
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"""Expose the finalize export functionality. |
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|
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""" |
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instance = objects.ConfigObject.Loads(params[0]) |
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snap_disks = [objects.ConfigObject.Loads(str_data) |
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for str_data in params[1]] |
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return backend.FinalizeExport(instance, snap_disks) |
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|
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@staticmethod |
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def perspective_export_info(params): |
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"""Query information about an existing export on this node. |
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|
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The given path may not contain an export, in which case we return |
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None. |
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|
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""" |
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path = params[0] |
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einfo = backend.ExportInfo(path) |
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if einfo is None: |
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return einfo |
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return einfo.Dumps() |
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|
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@staticmethod |
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def perspective_export_list(params): |
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"""List the available exports on this node. |
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|
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Note that as opposed to export_info, which may query data about an |
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export in any path, this only queries the standard Ganeti path |
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(constants.EXPORT_DIR). |
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|
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""" |
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return backend.ListExports() |
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|
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@staticmethod |
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def perspective_export_remove(params): |
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"""Remove an export. |
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|
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""" |
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export = params[0] |
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return backend.RemoveExport(export) |
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|
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# volume -------------------------- |
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|
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@staticmethod |
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def perspective_volume_list(params): |
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"""Query the list of logical volumes in a given volume group. |
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|
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""" |
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vgname = params[0] |
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return backend.GetVolumeList(vgname) |
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|
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@staticmethod |
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def perspective_vg_list(params): |
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"""Query the list of volume groups. |
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|
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""" |
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return backend.ListVolumeGroups() |
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|
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# bridge -------------------------- |
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|
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@staticmethod |
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def perspective_bridges_exist(params): |
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"""Check if all bridges given exist on this node. |
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|
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""" |
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bridges_list = params[0] |
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return backend.BridgesExist(bridges_list) |
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|
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# instance -------------------------- |
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|
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@staticmethod |
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def perspective_instance_os_add(params): |
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"""Install an OS on a given instance. |
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|
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""" |
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inst_s, os_disk, swap_disk = params |
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inst = objects.ConfigObject.Loads(inst_s) |
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return backend.AddOSToInstance(inst, os_disk, swap_disk) |
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|
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@staticmethod |
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def perspective_instance_os_import(params): |
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"""Run the import function of an OS onto a given instance. |
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|
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""" |
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inst_s, os_disk, swap_disk, src_node, src_image = params |
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inst = objects.ConfigObject.Loads(inst_s) |
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return backend.ImportOSIntoInstance(inst, os_disk, swap_disk, |
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src_node, src_image) |
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|
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@staticmethod |
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def perspective_instance_shutdown(params): |
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"""Shutdown an instance. |
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|
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""" |
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instance = objects.ConfigObject.Loads(params[0]) |
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return backend.ShutdownInstance(instance) |
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|
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@staticmethod |
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def perspective_instance_start(params): |
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"""Start an instance. |
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|
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""" |
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instance = objects.ConfigObject.Loads(params[0]) |
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extra_args = params[1] |
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return backend.StartInstance(instance, extra_args) |
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|
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@staticmethod |
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def perspective_instance_info(params): |
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"""Query instance information. |
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|
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""" |
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return backend.GetInstanceInfo(params[0]) |
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|
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@staticmethod |
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def perspective_all_instances_info(params): |
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"""Query information about all instances. |
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|
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""" |
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return backend.GetAllInstancesInfo() |
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|
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@staticmethod |
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def perspective_instance_list(params): |
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"""Query the list of running instances. |
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|
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""" |
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return backend.GetInstanceList() |
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|
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# node -------------------------- |
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|
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@staticmethod |
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def perspective_node_info(params): |
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"""Query node information. |
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|
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""" |
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vgname = params[0] |
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return backend.GetNodeInfo(vgname) |
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|
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@staticmethod |
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def perspective_node_add(params): |
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"""Complete the registration of this node in the cluster. |
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|
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""" |
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return backend.AddNode(params[0], params[1], params[2], |
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params[3], params[4], params[5]) |
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|
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@staticmethod |
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def perspective_node_verify(params): |
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"""Run a verify sequence on this node. |
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|
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""" |
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return backend.VerifyNode(params[0]) |
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|
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@staticmethod |
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def perspective_node_start_master(params): |
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"""Promote this node to master status. |
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|
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""" |
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return backend.StartMaster() |
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|
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@staticmethod |
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def perspective_node_stop_master(params): |
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"""Demote this node from master status. |
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|
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""" |
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return backend.StopMaster() |
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|
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@staticmethod |
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def perspective_node_leave_cluster(params): |
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"""Cleanup after leaving a cluster. |
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|
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""" |
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return backend.LeaveCluster() |
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|
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@staticmethod |
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def perspective_node_volumes(params): |
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"""Query the list of all logical volume groups. |
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|
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""" |
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return backend.NodeVolumes() |
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|
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# cluster -------------------------- |
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|
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@staticmethod |
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def perspective_version(params): |
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"""Query version information. |
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|
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""" |
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return constants.PROTOCOL_VERSION |
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|
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@staticmethod |
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def perspective_upload_file(params): |
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"""Upload a file. |
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|
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Note that the backend implementation imposes strict rules on which |
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files are accepted. |
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|
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""" |
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return backend.UploadFile(*params) |
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|
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|
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# os ----------------------- |
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|
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@staticmethod |
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def perspective_os_diagnose(params): |
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"""Query detailed information about existing OSes. |
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|
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""" |
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os_list = backend.DiagnoseOS() |
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if not os_list: |
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# this catches also return values of 'False', |
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# for which we can't iterate over |
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return os_list |
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result = [] |
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for data in os_list: |
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if isinstance(data, objects.OS): |
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result.append(data.Dumps()) |
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elif isinstance(data, errors.InvalidOS): |
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result.append(data.args) |
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else: |
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raise errors.ProgrammerError("Invalid result from backend.DiagnoseOS" |
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" (class %s, %s)" % |
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(str(data.__class__), data)) |
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|
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return result |
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|
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@staticmethod |
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def perspective_os_get(params): |
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"""Query information about a given OS. |
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|
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""" |
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name = params[0] |
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try: |
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os_obj = backend.OSFromDisk(name).Dumps() |
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except errors.InvalidOS, err: |
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os_obj = err.args |
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return os_obj |
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|
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# hooks ----------------------- |
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|
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@staticmethod |
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def perspective_hooks_runner(params): |
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"""Run hook scripts. |
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|
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""" |
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hpath, phase, env = params |
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hr = backend.HooksRunner() |
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return hr.RunHooks(hpath, phase, env) |
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|
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|
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class MyRealm: |
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"""Simple realm that forwards all requests to a ServerObject. |
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|
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""" |
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__implements__ = portal.IRealm |
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|
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def requestAvatar(self, avatarId, mind, *interfaces): |
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"""Return an avatar based on our ServerObject class. |
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|
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""" |
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if pb.IPerspective not in interfaces: |
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raise NotImplementedError |
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return pb.IPerspective, ServerObject(avatarId), lambda:None |
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|
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|
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def ParseOptions(): |
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"""Parse the command line options. |
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|
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Returns: |
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(options, args) as from OptionParser.parse_args() |
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|
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""" |
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parser = OptionParser(description="Ganeti node daemon", |
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usage="%prog [-f] [-d]", |
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version="%%prog (ganeti) %s" % |
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constants.RELEASE_VERSION) |
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|
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parser.add_option("-f", "--foreground", dest="fork", |
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help="Don't detach from the current terminal", |
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default=True, action="store_false") |
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parser.add_option("-d", "--debug", dest="debug", |
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help="Enable some debug messages", |
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default=False, action="store_true") |
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options, args = parser.parse_args() |
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return options, args |
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|
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|
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def main(): |
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"""Main function for the node daemon. |
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|
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""" |
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options, args = ParseOptions() |
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for fname in (constants.SSL_CERT_FILE,): |
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if not os.path.isfile(fname): |
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print "config %s not there, will not run." % fname |
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sys.exit(5) |
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|
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try: |
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ss = ssconf.SimpleStore() |
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port = ss.GetNodeDaemonPort() |
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pwdata = ss.GetNodeDaemonPassword() |
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except errors.ConfigurationError, err: |
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print "Cluster configuration incomplete: '%s'" % str(err) |
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sys.exit(5) |
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|
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# become a daemon |
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if options.fork: |
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createDaemon() |
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|
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logger.SetupLogging(twisted_workaround=True, debug=options.debug, |
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program="ganeti-noded") |
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|
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p = portal.Portal(MyRealm()) |
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p.registerChecker( |
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checkers.InMemoryUsernamePasswordDatabaseDontUse(master_node=pwdata)) |
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reactor.listenSSL(port, pb.PBServerFactory(p), ServerContextFactory()) |
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reactor.run() |
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|
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|
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def createDaemon(): |
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"""Detach a process from the controlling terminal and run it in the |
531 |
background as a daemon. |
532 |
|
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""" |
534 |
UMASK = 077 |
535 |
WORKDIR = "/" |
536 |
# Default maximum for the number of available file descriptors. |
537 |
if 'SC_OPEN_MAX' in os.sysconf_names: |
538 |
try: |
539 |
MAXFD = os.sysconf('SC_OPEN_MAX') |
540 |
if MAXFD < 0: |
541 |
MAXFD = 1024 |
542 |
except OSError: |
543 |
MAXFD = 1024 |
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else: |
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MAXFD = 1024 |
546 |
# The standard I/O file descriptors are redirected to /dev/null by default. |
547 |
#REDIRECT_TO = getattr(os, "devnull", "/dev/null") |
548 |
REDIRECT_TO = constants.LOG_NODESERVER |
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try: |
550 |
pid = os.fork() |
551 |
except OSError, e: |
552 |
raise Exception("%s [%d]" % (e.strerror, e.errno)) |
553 |
if (pid == 0): # The first child. |
554 |
os.setsid() |
555 |
try: |
556 |
pid = os.fork() # Fork a second child. |
557 |
except OSError, e: |
558 |
raise Exception("%s [%d]" % (e.strerror, e.errno)) |
559 |
if (pid == 0): # The second child. |
560 |
os.chdir(WORKDIR) |
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os.umask(UMASK) |
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else: |
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# exit() or _exit()? See below. |
564 |
os._exit(0) # Exit parent (the first child) of the second child. |
565 |
else: |
566 |
os._exit(0) # Exit parent of the first child. |
567 |
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1] |
568 |
if (maxfd == resource.RLIM_INFINITY): |
569 |
maxfd = MAXFD |
570 |
|
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# Iterate through and close all file descriptors. |
572 |
for fd in range(0, maxfd): |
573 |
try: |
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os.close(fd) |
575 |
except OSError: # ERROR, fd wasn't open to begin with (ignored) |
576 |
pass |
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os.open(REDIRECT_TO, os.O_RDWR|os.O_CREAT|os.O_APPEND) # standard input (0) |
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# Duplicate standard input to standard output and standard error. |
579 |
os.dup2(0, 1) # standard output (1) |
580 |
os.dup2(0, 2) # standard error (2) |
581 |
return(0) |
582 |
|
583 |
|
584 |
if __name__ == '__main__': |
585 |
main() |