Synnefo » snf-ganeti

		    GNU GENERAL PUBLIC LICENSE

		       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.

     51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 Everyone is permitted to copy and distribute verbatim copies

 of this license document, but changing it is not allowed.

			    Preamble

  The licenses for most software are designed to take away your

freedom to share and change it.  By contrast, the GNU General Public

License is intended to guarantee your freedom to share and change free

software--to make sure the software is free for all its users.  This

General Public License applies to most of the Free Software

Foundation's software and to any other program whose authors commit to

using it.  (Some other Free Software Foundation software is covered by

the GNU Library General Public License instead.)  You can apply it to

your programs, too.

  When we speak of free software, we are referring to freedom, not

price.  Our General Public Licenses are designed to make sure that you

have the freedom to distribute copies of free software (and charge for

this service if you wish), that you receive source code or can get it

if you want it, that you can change the software or use pieces of it

in new free programs; and that you know you can do these things.

  To protect your rights, we need to make restrictions that forbid

anyone to deny you these rights or to ask you to surrender the rights.

These restrictions translate to certain responsibilities for you if you

distribute copies of the software, or if you modify it.

  For example, if you distribute copies of such a program, whether

gratis or for a fee, you must give the recipients all the rights that

you have.  You must make sure that they, too, receive or can get the

source code.  And you must show them these terms so they know their

rights.

  We protect your rights with two steps: (1) copyright the software, and

(2) offer you this license which gives you legal permission to copy,

distribute and/or modify the software.

  Also, for each author's protection and ours, we want to make certain

that everyone understands that there is no warranty for this free

software.  If the software is modified by someone else and passed on, we

want its recipients to know that what they have is not the original, so

that any problems introduced by others will not reflect on the original

authors' reputations.

  Finally, any free program is threatened constantly by software

patents.  We wish to avoid the danger that redistributors of a free

program will individually obtain patent licenses, in effect making the

program proprietary.  To prevent this, we have made it clear that any

patent must be licensed for everyone's free use or not licensed at all.

  The precise terms and conditions for copying, distribution and

modification follow.

		    GNU GENERAL PUBLIC LICENSE

   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains

a notice placed by the copyright holder saying it may be distributed

under the terms of this General Public License.  The "Program", below,

refers to any such program or work, and a "work based on the Program"

means either the Program or any derivative work under copyright law:

that is to say, a work containing the Program or a portion of it,

either verbatim or with modifications and/or translated into another

language.  (Hereinafter, translation is included without limitation in

the term "modification".)  Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not

covered by this License; they are outside its scope.  The act of

running the Program is not restricted, and the output from the Program

is covered only if its contents constitute a work based on the

Program (independent of having been made by running the Program).

Whether that is true depends on what the Program does.

  1. You may copy and distribute verbatim copies of the Program's

source code as you receive it, in any medium, provided that you

conspicuously and appropriately publish on each copy an appropriate

copyright notice and disclaimer of warranty; keep intact all the

notices that refer to this License and to the absence of any warranty;

and give any other recipients of the Program a copy of this License

along with the Program.

You may charge a fee for the physical act of transferring a copy, and

you may at your option offer warranty protection in exchange for a fee.

  2. You may modify your copy or copies of the Program or any portion

of it, thus forming a work based on the Program, and copy and

distribute such modifications or work under the terms of Section 1

above, provided that you also meet all of these conditions:

    a) You must cause the modified files to carry prominent notices

    stating that you changed the files and the date of any change.

    b) You must cause any work that you distribute or publish, that in

    whole or in part contains or is derived from the Program or any

    part thereof, to be licensed as a whole at no charge to all third

    parties under the terms of this License.

    c) If the modified program normally reads commands interactively

    when run, you must cause it, when started running for such

    interactive use in the most ordinary way, to print or display an

    announcement including an appropriate copyright notice and a

    notice that there is no warranty (or else, saying that you provide

    a warranty) and that users may redistribute the program under

    these conditions, and telling the user how to view a copy of this

    License.  (Exception: if the Program itself is interactive but

    does not normally print such an announcement, your work based on

    the Program is not required to print an announcement.)

These requirements apply to the modified work as a whole.  If

identifiable sections of that work are not derived from the Program,

and can be reasonably considered independent and separate works in

themselves, then this License, and its terms, do not apply to those

sections when you distribute them as separate works.  But when you

distribute the same sections as part of a whole which is a work based

on the Program, the distribution of the whole must be on the terms of

this License, whose permissions for other licensees extend to the

entire whole, and thus to each and every part regardless of who wrote it.

Thus, it is not the intent of this section to claim rights or contest

your rights to work written entirely by you; rather, the intent is to

exercise the right to control the distribution of derivative or

collective works based on the Program.

In addition, mere aggregation of another work not based on the Program

with the Program (or with a work based on the Program) on a volume of

a storage or distribution medium does not bring the other work under

the scope of this License.

  3. You may copy and distribute the Program (or a work based on it,

under Section 2) in object code or executable form under the terms of

Sections 1 and 2 above provided that you also do one of the following:

    a) Accompany it with the complete corresponding machine-readable

    source code, which must be distributed under the terms of Sections

    1 and 2 above on a medium customarily used for software interchange; or,

    b) Accompany it with a written offer, valid for at least three

    years, to give any third party, for a charge no more than your

    cost of physically performing source distribution, a complete

    machine-readable copy of the corresponding source code, to be

    distributed under the terms of Sections 1 and 2 above on a medium

    customarily used for software interchange; or,

    c) Accompany it with the information you received as to the offer

    to distribute corresponding source code.  (This alternative is

    allowed only for noncommercial distribution and only if you

    received the program in object code or executable form with such

    an offer, in accord with Subsection b above.)

The source code for a work means the preferred form of the work for

making modifications to it.  For an executable work, complete source

code means all the source code for all modules it contains, plus any

associated interface definition files, plus the scripts used to

control compilation and installation of the executable.  However, as a

special exception, the source code distributed need not include

anything that is normally distributed (in either source or binary

form) with the major components (compiler, kernel, and so on) of the

operating system on which the executable runs, unless that component

itself accompanies the executable.

If distribution of executable or object code is made by offering

access to copy from a designated place, then offering equivalent

access to copy the source code from the same place counts as

distribution of the source code, even though third parties are not

compelled to copy the source along with the object code.

  4. You may not copy, modify, sublicense, or distribute the Program

except as expressly provided under this License.  Any attempt

otherwise to copy, modify, sublicense or distribute the Program is

void, and will automatically terminate your rights under this License.

However, parties who have received copies, or rights, from you under

this License will not have their licenses terminated so long as such

parties remain in full compliance.

  5. You are not required to accept this License, since you have not

signed it.  However, nothing else grants you permission to modify or

distribute the Program or its derivative works.  These actions are

prohibited by law if you do not accept this License.  Therefore, by

modifying or distributing the Program (or any work based on the

Program), you indicate your acceptance of this License to do so, and

all its terms and conditions for copying, distributing or modifying

the Program or works based on it.

  6. Each time you redistribute the Program (or any work based on the

Program), the recipient automatically receives a license from the

original licensor to copy, distribute or modify the Program subject to

these terms and conditions.  You may not impose any further

restrictions on the recipients' exercise of the rights granted herein.

You are not responsible for enforcing compliance by third parties to

this License.

  7. If, as a consequence of a court judgment or allegation of patent

infringement or for any other reason (not limited to patent issues),

conditions are imposed on you (whether by court order, agreement or

otherwise) that contradict the conditions of this License, they do not

excuse you from the conditions of this License.  If you cannot

distribute so as to satisfy simultaneously your obligations under this

License and any other pertinent obligations, then as a consequence you

may not distribute the Program at all.  For example, if a patent

license would not permit royalty-free redistribution of the Program by

all those who receive copies directly or indirectly through you, then

the only way you could satisfy both it and this License would be to

refrain entirely from distribution of the Program.

If any portion of this section is held invalid or unenforceable under

any particular circumstance, the balance of the section is intended to

apply and the section as a whole is intended to apply in other

circumstances.

It is not the purpose of this section to induce you to infringe any

patents or other property right claims or to contest validity of any

such claims; this section has the sole purpose of protecting the

integrity of the free software distribution system, which is

implemented by public license practices.  Many people have made

generous contributions to the wide range of software distributed

through that system in reliance on consistent application of that

system; it is up to the author/donor to decide if he or she is willing

to distribute software through any other system and a licensee cannot

impose that choice.

This section is intended to make thoroughly clear what is believed to

be a consequence of the rest of this License.

  8. If the distribution and/or use of the Program is restricted in

certain countries either by patents or by copyrighted interfaces, the

original copyright holder who places the Program under this License

may add an explicit geographical distribution limitation excluding

those countries, so that distribution is permitted only in or among

countries not thus excluded.  In such case, this License incorporates

the limitation as if written in the body of this License.

  9. The Free Software Foundation may publish revised and/or new versions

of the General Public License from time to time.  Such new versions will

be similar in spirit to the present version, but may differ in detail to

address new problems or concerns.

Each version is given a distinguishing version number.  If the Program

specifies a version number of this License which applies to it and "any

later version", you have the option of following the terms and conditions

either of that version or of any later version published by the Free

Software Foundation.  If the Program does not specify a version number of

this License, you may choose any version ever published by the Free Software

Foundation.

  10. If you wish to incorporate parts of the Program into other free

programs whose distribution conditions are different, write to the author

to ask for permission.  For software which is copyrighted by the Free

Software Foundation, write to the Free Software Foundation; we sometimes

make exceptions for this.  Our decision will be guided by the two goals

of preserving the free status of all derivatives of our free software and

of promoting the sharing and reuse of software generally.

			    NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY

FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN

OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES

PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED

OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS

TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE

PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,

REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING

WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR

REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,

INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING

OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED

TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY

YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER

PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGES.

		     END OF TERMS AND CONDITIONS

	    How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest

possible use to the public, the best way to achieve this is to make it

free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest

to attach them to the start of each source file to most effectively

convey the exclusion of warranty; and each file should have at least

the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>

    Copyright (C) <year>  <name of author>

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this

when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) year  name of author

    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

    This is free software, and you are welcome to redistribute it

    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate

parts of the General Public License.  Of course, the commands you use may

be called something other than `show w' and `show c'; they could even be

mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your

school, if any, to sign a "copyright disclaimer" for the program, if

necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program

  `Gnomovision' (which makes passes at compilers) written by James Hacker.

  <signature of Ty Coon>, 1 April 1989

  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into

proprietary programs.  If your program is a subroutine library, you may

consider it more useful to permit linking proprietary applications with the

library.  If this is what you want to do, use the GNU Library General

Public License instead of this License.

Installation of the software

============================

Before installing, please verify that you have the following programs:

  - lvm 2

  - ssh

  - fping

  - python twisted library (the core is enough)

  - python openssl bindings

To install, simply do ./configure && make && make install

This will install the software under /usr/local. You then need to copy

ganeti.init to /etc/init.d and integrate it into your boot sequence

(``chkconfig``, ``update-rc.d``, etc.).

Cluster initialisation

======================

Before initialising the cluster, on each node you need to create the following

directories:

  - /etc/ganeti

  - /var/log/ganeti

  - /var/lib/ganeti

  - /srv/ganeti and /srv/ganeti/os

After this, use ``gnt-cluster init``.

# standard automake rules

SUBDIRS = man lib scripts daemons docs testing tools

EXTRA_DIST = ganeti.initd

# custom rules

depgraph: depgraph.png

depgraph.png: depgraph.dot

	dot -Tpng -o $@ $<

depgraph.ps: depgraph.dot

	dot -Tps -o $@ $<

depgraph.dot: ganeti/*.py

	pylint.python2.4 --indent-string '  ' --rcfile=/dev/null --reports y --int-import-graph $@ --persistent n ganeti >/dev/null

Ganeti 1.2

==========

For installation instructions, read the INSTALL file.

For a brief introduction, read the ganeti(7) manpage and the other pages

it suggests.

#                                               -*- Autoconf -*-

# Process this file with autoconf to produce a configure script.

AC_PREREQ(2.59)

AC_INIT(ganeti, 1.2a, ganeti@googlegroups.com)

AM_INIT_AUTOMAKE(foreign)

# Checks for programs.

AC_PROG_INSTALL

# Checks for python

AM_PATH_PYTHON(2.4)

# Checks for libraries.

# Checks for header files.

# Checks for typedefs, structures, and compiler characteristics.

# Checks for library functions.

AC_CONFIG_FILES([Makefile man/Makefile docs/Makefile 

		testing/Makefile tools/Makefile

		lib/Makefile scripts/Makefile daemons/Makefile])

AC_OUTPUT

dist_sbin_SCRIPTS = ganeti-noded ganeti-watcher

#!/usr/bin/python

#

# Copyright (C) 2006, 2007 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Ganeti node daemon"""

import os

import sys

import resource

import traceback

from optparse import OptionParser

from ganeti import backend

from ganeti import logger

from ganeti import constants

from ganeti import objects

from ganeti import errors

from ganeti import ssconf

from twisted.spread import pb

from twisted.internet import reactor

from twisted.cred import checkers, portal

from OpenSSL import SSL

class ServerContextFactory:

  def getContext(self):

    ctx = SSL.Context(SSL.TLSv1_METHOD)

    ctx.use_certificate_file(constants.SSL_CERT_FILE)

    ctx.use_privatekey_file(constants.SSL_CERT_FILE)

    return ctx

class ServerObject(pb.Avatar):

  def __init__(self, name):

    self.name = name

  def perspectiveMessageReceived(self, broker, message, args, kw):

    """This method is called when a network message is received.

    I will call::

      |  self.perspective_%(message)s(*broker.unserialize(args),

      |                               **broker.unserialize(kw))

    to handle the method; subclasses of Avatar are expected to

    implement methods of this naming convention.

    """

    args = broker.unserialize(args, self)

    kw = broker.unserialize(kw, self)

    method = getattr(self, "perspective_%s" % message)

    tb = None

    state = None

    try:

      state = method(*args, **kw)

    except:

      tb = traceback.format_exc()

    return broker.serialize((tb, state), self, method, args, kw)

  # the new block devices  --------------------------

  def perspective_blockdev_create(self,params):

    bdev_s, size, on_primary = params

    bdev = objects.ConfigObject.Loads(bdev_s)

    if bdev is None:

      raise ValueError("can't unserialize data!")

    return backend.CreateBlockDevice(bdev, size, on_primary)

  def perspective_blockdev_remove(self,params):

    bdev_s = params[0]

    bdev = objects.ConfigObject.Loads(bdev_s)

    return backend.RemoveBlockDevice(bdev)

  def perspective_blockdev_assemble(self,params):

    bdev_s, on_primary = params

    bdev = objects.ConfigObject.Loads(bdev_s)

    if bdev is None:

      raise ValueError("can't unserialize data!")

    return backend.AssembleBlockDevice(bdev, on_primary)

  def perspective_blockdev_shutdown(self,params):

    bdev_s = params[0]

    bdev = objects.ConfigObject.Loads(bdev_s)

    if bdev is None:

      raise ValueError("can't unserialize data!")

    return backend.ShutdownBlockDevice(bdev)

  def perspective_blockdev_addchild(self,params):

    bdev_s, ndev_s = params

    bdev = objects.ConfigObject.Loads(bdev_s)

    ndev = objects.ConfigObject.Loads(ndev_s)

    if bdev is None or ndev is None:

      raise ValueError("can't unserialize data!")

    return backend.MirrorAddChild(bdev, ndev)

  def perspective_blockdev_removechild(self,params):

    bdev_s, ndev_s = params

    bdev = objects.ConfigObject.Loads(bdev_s)

    ndev = objects.ConfigObject.Loads(ndev_s)

    if bdev is None or ndev is None:

      raise ValueError("can't unserialize data!")

    return backend.MirrorRemoveChild(bdev, ndev)

  def perspective_blockdev_getmirrorstatus(self, params):

    disks = [objects.ConfigObject.Loads(dsk_s)

            for dsk_s in params]

    return backend.GetMirrorStatus(disks)

  def perspective_blockdev_find(self, params):

    disk = objects.ConfigObject.Loads(params[0])

    return backend.FindBlockDevice(disk)

  def perspective_blockdev_snapshot(self,params):

    cfbd = objects.ConfigObject.Loads(params[0])

    return backend.SnapshotBlockDevice(cfbd)

  # export/import  --------------------------

  def perspective_snapshot_export(self,params):

    disk = objects.ConfigObject.Loads(params[0])

    dest_node = params[1]

    instance = objects.ConfigObject.Loads(params[2])

    return backend.ExportSnapshot(disk,dest_node,instance)

  def perspective_finalize_export(self,params):

    instance = objects.ConfigObject.Loads(params[0])

    snap_disks = [objects.ConfigObject.Loads(str_data)

                  for str_data in params[1]]

    return backend.FinalizeExport(instance, snap_disks)

  def perspective_export_info(self,params):

    dir = params[0]

    einfo = backend.ExportInfo(dir)

    if einfo is None:

      return einfo

    return einfo.Dumps()

  def perspective_export_list(self, params):

    return backend.ListExports()

  def perspective_export_remove(self, params):

    export = params[0]

    return backend.RemoveExport(export)

  # volume  --------------------------

  def perspective_volume_list(self,params):

    vgname = params[0]

    return backend.GetVolumeList(vgname)

  def perspective_vg_list(self,params):

    return backend.ListVolumeGroups()

  # bridge  --------------------------

  def perspective_bridges_exist(self,params):

    bridges_list = params[0]

    return backend.BridgesExist(bridges_list)

  # instance  --------------------------

  def perspective_instance_os_add(self,params):

    inst_s, os_disk, swap_disk = params

    inst = objects.ConfigObject.Loads(inst_s)

    return backend.AddOSToInstance(inst, os_disk, swap_disk)

  def perspective_instance_os_import(self, params):

    inst_s, os_disk, swap_disk, src_node, src_image = params

    inst = objects.ConfigObject.Loads(inst_s)

    return backend.ImportOSIntoInstance(inst, os_disk, swap_disk,

                                        src_node, src_image)

  def perspective_instance_shutdown(self,params):

    instance = objects.ConfigObject.Loads(params[0])

    return backend.ShutdownInstance(instance)

  def perspective_instance_start(self,params):

    instance = objects.ConfigObject.Loads(params[0])

    extra_args = params[1]

    return backend.StartInstance(instance, extra_args)

  def perspective_instance_info(self,params):

    return backend.GetInstanceInfo(params[0])

  def perspective_all_instances_info(self,params):

    return backend.GetAllInstancesInfo()

  def perspective_instance_list(self,params):

    return backend.GetInstanceList()

  # node --------------------------

  def perspective_node_info(self,params):

    vgname = params[0]

    return backend.GetNodeInfo(vgname)

  def perspective_node_add(self,params):

    return backend.AddNode(params[0], params[1], params[2],

                           params[3], params[4], params[5])

  def perspective_node_verify(self,params):

    return backend.VerifyNode(params[0])

  def perspective_node_start_master(self, params):

    return backend.StartMaster()

  def perspective_node_stop_master(self, params):

    return backend.StopMaster()

  def perspective_node_leave_cluster(self, params):

    return backend.LeaveCluster()

  # cluster --------------------------

  def perspective_version(self,params):

    return constants.PROTOCOL_VERSION

  def perspective_configfile_list(self,params):

    return backend.ListConfigFiles()

  def perspective_upload_file(self,params):

    return backend.UploadFile(*params)

  # os -----------------------

  def perspective_os_diagnose(self, params):

    os_list = backend.DiagnoseOS()

    if not os_list:

      # this catches also return values of 'False',

      # for which we can't iterate over

      return os_list

    result = []

    for data in os_list:

      if isinstance(data, objects.OS):

        result.append(data.Dumps())

      elif isinstance(data, errors.InvalidOS):

        result.append(data.args)

      else:

        raise errors.ProgrammerError, ("Invalid result from backend.DiagnoseOS"

                                       " (class %s, %s)" %

                                       (str(data.__class__), data))

    return result

  def perspective_os_get(self, params):

    name = params[0]

    try:

      os = backend.OSFromDisk(name).Dumps()

    except errors.InvalidOS, err:

      os = err.args

    return os

  # hooks -----------------------

  def perspective_hooks_runner(self, params):

    hpath, phase, env = params

    hr = backend.HooksRunner()

    return hr.RunHooks(hpath, phase, env)

class MyRealm:

  __implements__ = portal.IRealm

  def requestAvatar(self, avatarId, mind, *interfaces):

    if pb.IPerspective not in interfaces:

      raise NotImplementedError

    return pb.IPerspective, ServerObject(avatarId), lambda:None

def ParseOptions():

  """Parse the command line options.

  Returns:

    (options, args) as from OptionParser.parse_args()

  """

  parser = OptionParser(description="Ganeti node daemon",

                        usage="%prog [-f] [-d]",

                        version="%%prog (ganeti) %s" %

                        constants.RELEASE_VERSION)

  parser.add_option("-f", "--foreground", dest="fork",

                    help="Don't detach from the current terminal",

                    default=True, action="store_false")

  parser.add_option("-d", "--debug", dest="debug",

                    help="Enable some debug messages",

                    default=False, action="store_true")

  options, args = parser.parse_args()

  return options, args

def main():

  options, args = ParseOptions()

  for fname in (constants.SSL_CERT_FILE,):

    if not os.path.isfile(fname):

      print "config %s not there, will not run." % fname

      sys.exit(5)

  try:

    ss = ssconf.SimpleStore()

    port = ss.GetNodeDaemonPort()

    pwdata = ss.GetNodeDaemonPassword()

  except errors.ConfigurationError, err:

    print "Cluster configuration incomplete: '%s'" % str(err)

    sys.exit(5)

  # become a daemon

  if options.fork:

    createDaemon()

  logger.SetupLogging(twisted_workaround=True, debug=options.debug,

                      program="ganeti-noded")

  p = portal.Portal(MyRealm())

  p.registerChecker(

    checkers.InMemoryUsernamePasswordDatabaseDontUse(master_node=pwdata))

  reactor.listenSSL(port, pb.PBServerFactory(p), ServerContextFactory())

  reactor.run()

def createDaemon():

  """Detach a process from the controlling terminal and run it in the

  background as a daemon.

  """

  UMASK = 077

  WORKDIR = "/"

  # Default maximum for the number of available file descriptors.

  if 'SC_OPEN_MAX' in os.sysconf_names:

    try:

      MAXFD = os.sysconf('SC_OPEN_MAX')

      if MAXFD < 0:

        MAXFD = 1024

    except OSError:

      MAXFD = 1024

  else:

    MAXFD = 1024

  # The standard I/O file descriptors are redirected to /dev/null by default.

  #REDIRECT_TO = getattr(os, "devnull", "/dev/null")

  REDIRECT_TO = constants.LOG_NODESERVER

  try:

    pid = os.fork()

  except OSError, e:

    raise Exception, "%s [%d]" % (e.strerror, e.errno)

  if (pid == 0):	# The first child.

    os.setsid()

    try:

      pid = os.fork()	# Fork a second child.

    except OSError, e:

      raise Exception, "%s [%d]" % (e.strerror, e.errno)

    if (pid == 0):	# The second child.

      os.chdir(WORKDIR)

      os.umask(UMASK)

    else:

      # exit() or _exit()?  See below.

      os._exit(0)	# Exit parent (the first child) of the second child.

  else:

    os._exit(0)	# Exit parent of the first child.

  maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]

  if (maxfd == resource.RLIM_INFINITY):

    maxfd = MAXFD

  # Iterate through and close all file descriptors.

  for fd in range(0, maxfd):

    try:

      os.close(fd)

    except OSError:	# ERROR, fd wasn't open to begin with (ignored)

      pass

  os.open(REDIRECT_TO, os.O_RDWR|os.O_CREAT|os.O_APPEND) # standard input (0)

  # Duplicate standard input to standard output and standard error.

  os.dup2(0, 1)			# standard output (1)

  os.dup2(0, 2)			# standard error (2)

  return(0)

if __name__=='__main__':

  main()

#!/usr/bin/python

#

# Copyright (C) 2006, 2007 Google Inc.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Tool to restart erronously downed virtual machines.

This program and set of classes implement a watchdog to restart

virtual machines in a Ganeti cluster that have crashed or been killed

by a node reboot.  Run from cron or similar.

"""

LOGFILE = '/var/log/ganeti/watcher.log'

MAXTRIES = 5

BAD_STATES = ['stopped']

HELPLESS_STATES = ['(node down)']

NOTICE = 'NOTICE'

ERROR = 'ERROR'

import os

import sys

import time

import fcntl

import errno

from optparse import OptionParser

from ganeti import utils

from ganeti import constants

class Error(Exception):

  """Generic custom error class."""

  pass

def Indent(s, prefix='| '):

  """Indent a piece of text with a given prefix before each line.

  Args:

    s: The string to indent

    prefix: The string to prepend each line.

  """

  return "%s%s\n" % (prefix, ('\n' + prefix).join(s.splitlines()))

def DoCmd(cmd):

  """Run a shell command.

  Args:

    cmd: the command to run.

  Raises CommandError with verbose commentary on error.

  """

  res = utils.RunCmd(cmd)

  if res.failed:

    raise Error("Command %s failed:\n%s\nstdout:\n%sstderr:\n%s" %

                (repr(cmd),

                 Indent(res.fail_reason),

                 Indent(res.stdout),

                 Indent(res.stderr)))

  return res

class RestarterState(object):

  """Interface to a state file recording restart attempts.

  Methods:

    Open(): open, lock, read and parse the file.

            Raises StandardError on lock contention.

    NumberOfAttempts(name): returns the number of times in succession

                            a restart has been attempted of the named instance.

    RecordAttempt(name, when): records one restart attempt of name at

                               time in when.

    Remove(name): remove record given by name, if exists.

    Save(name): saves all records to file, releases lock and closes file.

  """

  def __init__(self):

    # The two-step dance below is necessary to allow both opening existing

    # file read/write and creating if not existing.  Vanilla open will truncate

    # an existing file -or- allow creating if not existing.

    f = os.open(constants.WATCHER_STATEFILE, os.O_RDWR | os.O_CREAT)

    f = os.fdopen(f, 'w+')

    try:

      fcntl.flock(f.fileno(), fcntl.LOCK_EX|fcntl.LOCK_NB)

    except IOError, x:

      if x.errno == errno.EAGAIN:

        raise StandardError('State file already locked')

      raise

    self.statefile = f

    self.inst_map = {}

    for line in f:

      name, when, count = line.rstrip().split(':')

      when = int(when)

      count = int(count)

      self.inst_map[name] = (when, count)

  def NumberOfAttempts(self, instance):

    """Returns number of previous restart attempts.

    Args:

      instance - the instance to look up.

    """

    assert self.statefile

    if instance.name in self.inst_map:

      return self.inst_map[instance.name][1]

    return 0

  def RecordAttempt(self, instance):

    """Record a restart attempt.

    Args:

      instance - the instance being restarted

    """

    assert self.statefile

    when = time.time()

    self.inst_map[instance.name] = (when, 1 + self.NumberOfAttempts(instance))

  def Remove(self, instance):

    """Update state to reflect that a machine is running, i.e. remove record

    Args:

      instance - the instance to remove from books

    This method removes the record for a named instance

    """

    assert self.statefile

    if instance.name in self.inst_map:

      del self.inst_map[instance.name]

  def Save(self):

    """Save records to file, then unlock and close file.

    """

    assert self.statefile

    self.statefile.seek(0)

    self.statefile.truncate()

    for name in self.inst_map:

      print >> self.statefile, "%s:%d:%d" % ((name,) + self.inst_map[name])

    fcntl.flock(self.statefile.fileno(), fcntl.LOCK_UN)

    self.statefile.close()

    self.statefile = None

class Instance(object):

  """Abstraction for a Virtual Machine instance.

  Methods:

    Restart(): issue a command to restart the represented machine.

  """

  def __init__(self, name, state):

    self.name = name

    self.state = state

  def Restart(self):

    DoCmd(['gnt-instance', 'startup', '--lock-retries=15', self.name])

class InstanceList(object):

  """The set of Virtual Machine instances on a cluster.

  """

  cmd = ['gnt-instance', 'list', '--lock-retries=15',

         '-o', 'name,admin_state,oper_state', '--no-headers', '--separator=:']

  def __init__(self):

    res = DoCmd(self.cmd)

    lines = res.stdout.splitlines()

    self.instances = []

    for line in lines:

      fields = [fld.strip() for fld in line.split(':')]

      if len(fields) != 3:

        continue

      if fields[1] == "no": #no autostart, we don't care about this instance

        continue

      name, status = fields[0], fields[2]

      self.instances.append(Instance(name, status))

  def __iter__(self):

    return self.instances.__iter__()

class Message(object):

  """Encapsulation of a notice or error message.

  """

  def __init__(self, level, msg):

    self.level = level

    self.msg = msg

    self.when = time.time()

  def __str__(self):

    return self.level + ' ' + time.ctime(self.when) + '\n' + Indent(self.msg)

class Restarter(object):

  """Encapsulate the logic for restarting erronously halted virtual machines.

  The calling program should periodically instantiate me and call Run().

  This will traverse the list of instances, and make up to MAXTRIES attempts

  to restart machines that are down.

  """

  def __init__(self):

    self.instances = InstanceList()

    self.messages = []

  def Run(self):

    """Make a pass over the list of instances, restarting downed ones.

    """

    notepad = RestarterState()

    for instance in self.instances:

      if instance.state in BAD_STATES:

        n = notepad.NumberOfAttempts(instance)

        if n > MAXTRIES:

          # stay quiet.

          continue

        elif n < MAXTRIES:

          last = " (Attempt #%d)" % (n + 1)

        else:

          notepad.RecordAttempt(instance)

          self.messages.append(Message(ERROR, "Could not restart %s for %d"

                                       " times, giving up..." %

                                       (instance.name, MAXTRIES)))

          continue

        try:

          self.messages.append(Message(NOTICE,

                                       "Restarting %s%s." %

                                       (instance.name, last)))

          instance.Restart()

        except Error, x:

          self.messages.append(Message(ERROR, str(x)))

        notepad.RecordAttempt(instance)

      elif instance.state in HELPLESS_STATES:

        if notepad.NumberOfAttempts(instance):

          notepad.Remove(instance)

      else:

        if notepad.NumberOfAttempts(instance):

          notepad.Remove(instance)

          msg = Message(NOTICE,

                        "Restart of %s succeeded." % instance.name)

          self.messages.append(msg)

    notepad.Save()

  def WriteReport(self, logfile):

    """

    Log all messages to file.

    Args:

      logfile: file object open for writing (the log file)

    """

    for msg in self.messages:

      print >> logfile, str(msg)

def ParseOptions():

  """Parse the command line options.

  Returns:

    (options, args) as from OptionParser.parse_args()

  """

  parser = OptionParser(description="Ganeti cluster watcher",

                        usage="%prog [-d]",

                        version="%%prog (ganeti) %s" %

                        constants.RELEASE_VERSION)

  parser.add_option("-d", "--debug", dest="debug",

                    help="Don't redirect messages to the log file",

                    default=False, action="store_true")

  options, args = parser.parse_args()

  return options, args

def main():

  """Main function.

  """

  options, args = ParseOptions()

  if not options.debug:

    sys.stderr = sys.stdout = open(LOGFILE, 'a')

  try:

    restarter = Restarter()

    restarter.Run()

    restarter.WriteReport(sys.stdout)

  except Error, err:

    print err

if __name__ == '__main__':

  main()

docdir = $(datadir)/doc/$(PACKAGE)

dist_doc_DATA = hooks.html hooks.pdf

EXTRA_DIST = hooks.sgml

%.html: %.sgml

	docbook2html --nochunks $<

%.pdf: %.sgml

	docbook2pdf $<

<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook V4.2//EN" [

]>

  <article class="specification">

  <articleinfo>

    <title>Ganeti customisation using hooks</title>

  </articleinfo>

  <para>Documents ganeti version 1.2</para>

  <section>

    <title>Introduction</title>

    <para>

      In order to allow customisation of operations, ganeti will run

      scripts under <filename

      class="directory">/etc/ganeti/hooks</filename> based on certain

      rules.

    </para>

      <para>This is similar to the <filename

      class="directory">/etc/network/</filename> structure present in

      Debian for network interface handling.</para>

    </section>

    <section>

      <title>Organisation</title>

      <para>For every operation, two sets of scripts are run:

      <itemizedlist>

          <listitem>

            <simpara>pre phase (for authorization/checking)</simpara>

          </listitem>

          <listitem>

            <simpara>post phase (for logging)</simpara>

          </listitem>

        </itemizedlist>

      </para>

      <para>Also, for each operation, the scripts are run on one or

      more nodes, depending on the operation type.</para>

      <para>Note that, even though we call them scripts, we are

      actually talking about any executable.</para>

      <section>

        <title><emphasis>pre</emphasis> scripts</title>

        <para>The <emphasis>pre</emphasis> scripts have a definite

        target: to check that the operation is allowed given the

        site-specific constraints. You could have, for example, a rule

        that says every new instance is required to exists in a

        database; to implement this, you could write a script that

        checks the new instance parameters against your

        database.</para>

        <para>The objective of these scripts should be their return

        code (zero or non-zero for success and failure). However, if

        they modify the environment in any way, they should be

        idempotent, as failed executions could be restarted and thus

        the script(s) run again with exactly the same

        parameters.</para>

      </section>

      <section>

        <title><emphasis>post</emphasis> scripts</title>

        <para>These scripts should do whatever you need as a reaction

        to the completion of an operation. Their return code is not

        checked (but logged), and they should not depend on the fact

        that the <emphasis>pre</emphasis> scripts have been

        run.</para>

      </section>

      <section>

        <title>Naming</title>

        <para>The allowed names for the scripts consist of (similar to

        <citerefentry> <refentrytitle>run-parts</refentrytitle>

        <manvolnum>8</manvolnum> </citerefentry>) upper and lower

        case, digits, underscores and hyphens. In other words, the

        regexp

        <computeroutput>^[a-zA-Z0-9_-]+$</computeroutput>. Also,

        non-executable scripts will be ignored.

        </para>

      </section>

      <section>

        <title>Order of execution</title>

        <para>On a single node, the scripts in a directory are run in

        lexicographic order (more exactly, the python string

        comparison order). It is advisable to implement the usual

        <emphasis>NN-name</emphasis> convention where

        <emphasis>NN</emphasis> is a two digit number.</para>

        <para>For an operation whose hooks are run on multiple nodes,

        there is no specific ordering of nodes with regard to hooks

        execution; you should assume that the scripts are run in

        parallel on the target nodes (keeping on each node the above

        specified ordering).  If you need any kind of inter-node

        synchronisation, you have to implement it yourself in the

        scripts.</para>

      </section>

      <section>

        <title>Execution environment</title>

        <para>The scripts will be run as follows:

          <itemizedlist>

          <listitem>

            <simpara>no command line arguments</simpara>

          </listitem>

            <listitem>

              <simpara>no controlling <acronym>tty</acronym></simpara>

            </listitem>

            <listitem>

              <simpara><varname>stdin</varname> is

              actually <filename>/dev/null</filename></simpara>

            </listitem>

            <listitem>

              <simpara><varname>stdout</varname> and

              <varname>stderr</varname> are directed to

              files</simpara>

            </listitem>

          <listitem>

            <simpara>the <varname>PATH</varname> is reset to

            <literal>/sbin:/bin:/usr/sbin:/usr/bin</literal></simpara>

          </listitem>

          <listitem>

            <simpara>the environment is cleared, and only

            ganeti-specific variables will be left</simpara>

          </listitem>

          </itemizedlist>

        </para>

      <para>All informations about the cluster is passed using

      environment variables. Different operations will have sligthly

      different environments, but most of the variables are

      common.</para>

    </section>

    <section>

      <title>Operation list</title>

      <table>

        <title>Operation list</title>

        <tgroup cols="7">

          <colspec>

          <colspec>

          <colspec>

          <colspec>

          <colspec>

          <colspec colname="prehooks">

          <colspec colname="posthooks">

          <spanspec namest="prehooks" nameend="posthooks"

            spanname="bothhooks">

          <thead>

            <row>

              <entry>Operation ID</entry>

              <entry>Directory prefix</entry>

              <entry>Description</entry>

              <entry>Command</entry>

              <entry>Supported env. variables</entry>

              <entry><emphasis>pre</emphasis> hooks</entry>

              <entry><emphasis>post</emphasis> hooks</entry>

            </row>

          </thead>

          <tbody>

            <row>

              <entry>OP_INIT_CLUSTER</entry>

              <entry><filename class="directory">cluster-init</filename></entry>

              <entry>Initialises the cluster</entry>

              <entry><computeroutput>gnt-cluster init</computeroutput></entry>

              <entry><constant>CLUSTER</constant>, <constant>MASTER</constant></entry>

              <entry spanname="bothhooks">master node, cluster name</entry>

            </row>

            <row>

              <entry>OP_MASTER_FAILOVER</entry>

              <entry><filename class="directory">master-failover</filename></entry>

              <entry>Changes the master</entry>

              <entry><computeroutput>gnt-cluster master-failover</computeroutput></entry>

              <entry><constant>OLD_MASTER</constant>, <constant>NEW_MASTER</constant></entry>

              <entry>the new master</entry>

              <entry>all nodes</entry>

            </row>

            <row>

              <entry>OP_ADD_NODE</entry>

              <entry><filename class="directory">node-add</filename></entry>

              <entry>Adds a new node to the cluster</entry>

              <entry><computeroutput>gnt-node add</computeroutput></entry>

              <entry><constant>NODE_NAME</constant>, <constant>NODE_PIP</constant>, <constant>NODE_SIP</constant></entry>

              <entry>all existing nodes</entry>

              <entry>all existing nodes plus the new node</entry>

            </row>

            <row>

              <entry>OP_REMOVE_NODE</entry>

              <entry><filename class="directory">node-remove</filename></entry>

              <entry>Removes a node from the cluster</entry>

              <entry><computeroutput>gnt-node remove</computeroutput></entry>

              <entry><constant>NODE_NAME</constant></entry>

              <entry spanname="bothhooks">all existing nodes except the removed node</entry>

            </row>

            <row>

              <entry>OP_INSTANCE_ADD</entry>

              <entry><filename class="directory">instance-add</filename></entry>

              <entry>Creates a new instance</entry>

              <entry><computeroutput>gnt-instance add</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>INSTANCE_PRIMARY</constant>, <constant>INSTANCE_SECONDARIES</constant>, <constant>DISK_TEMPLATE</constant>, <constant>MEM_SIZE</constant>, <constant>DISK_SIZE</constant>, <constant>SWAP_SIZE</constant>, <constant>VCPUS</constant>, <constant>INSTANCE_IP</constant>, <constant>INSTANCE_ADD_MODE</constant>, <constant>SRC_NODE</constant>, <constant>SRC_PATH</constant>, <constant>SRC_IMAGE</constant></entry>

              <entry spanname="bothhooks" morerows="4">master node, primary and

                   secondary nodes</entry>

            </row>

            <row>

              <entry>OP_BACKUP_EXPORT</entry>

              <entry><filename class="directory">instance-export</filename></entry>

              <entry>Export the instance</entry>

              <entry><computeroutput>gnt-backup export</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>EXPORT_NODE</constant>, <constant>EXPORT_DO_SHUTDOWN</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_START</entry>

              <entry><filename class="directory">instance-start</filename></entry>

              <entry>Starts an instance</entry>

              <entry><computeroutput>gnt-instance start</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>INSTANCE_PRIMARY</constant>, <constant>INSTANCE_SECONDARIES</constant>, <constant>FORCE</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_SHUTDOWN</entry>

              <entry><filename class="directory">instance-shutdown</filename></entry>

              <entry>Stops an instance</entry>

              <entry><computeroutput>gnt-instance shutdown</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>INSTANCE_PRIMARY</constant>, <constant>INSTANCE_SECONDARIES</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_MODIFY</entry>

              <entry><filename class="directory">instance-modify</filename></entry>

              <entry>Modifies the instance parameters.</entry>

              <entry><computeroutput>gnt-instance modify</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>MEM_SIZE</constant>, <constant>VCPUS</constant>, <constant>INSTANCE_IP</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_FAILOVER</entry>

              <entry><filename class="directory">instance-failover</filename></entry>

              <entry>Failover an instance</entry>

              <entry><computeroutput>gnt-instance start</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>INSTANCE_PRIMARY</constant>, <constant>INSTANCE_SECONDARIES</constant>, <constant>IGNORE_CONSISTENCY</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_REMOVE</entry>

              <entry><filename class="directory">instance-remove</filename></entry>

              <entry>Remove an instance</entry>

              <entry><computeroutput>gnt-instance remove</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>INSTANCE_PRIMARY</constant>, <constant>INSTANCE_SECONDARIES</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_ADD_MDDRBD</entry>

              <entry><filename class="directory">mirror-add</filename></entry>

              <entry>Adds a mirror component</entry>

              <entry><computeroutput>gnt-instance add-mirror</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>NEW_SECONDARY</constant>, <constant>DISK_NAME</constant></entry>

            </row>

            <row>

              <entry>OP_INSTANCE_REMOVE_MDDRBD</entry>

              <entry><filename class="directory">mirror-remove</filename></entry>

              <entry>Removes a mirror component</entry>

              <entry><computeroutput>gnt-instance remove-mirror</computeroutput></entry>

              <entry><constant>INSTANCE_NAME</constant>, <constant>OLD_SECONDARY</constant>, <constant>DISK_NAME</constant>, <constant>DISK_ID</constant></entry>

            </row>

            <row>