gnt_cluster.py 42.7 KB
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#
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#

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# Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
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#
# 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.

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"""Cluster related commands"""
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# pylint: disable-msg=W0401,W0613,W0614,C0103
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# W0401: Wildcard import ganeti.cli
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# W0613: Unused argument, since all functions follow the same API
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# W0614: Unused import %s from wildcard import (since we need cli)
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# C0103: Invalid name gnt-cluster
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import os.path
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import time
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import OpenSSL
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import itertools
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from ganeti.cli import *
from ganeti import opcodes
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from ganeti import constants
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from ganeti import errors
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from ganeti import utils
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from ganeti import bootstrap
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from ganeti import ssh
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from ganeti import objects
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from ganeti import uidpool
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from ganeti import compat
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from ganeti import netutils


ON_OPT = cli_option("--on", default=False,
                    action="store_true", dest="on",
                    help="Recover from an EPO")

GROUPS_OPT = cli_option("--groups", default=False,
                    action="store_true", dest="groups",
                    help="Arguments are node groups instead of nodes")

_EPO_PING_INTERVAL = 30 # 30 seconds between pings
_EPO_PING_TIMEOUT = 1 # 1 second
_EPO_REACHABLE_TIMEOUT = 15 * 60 # 15 minutes
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@UsesRPC
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def InitCluster(opts, args):
  """Initialize the cluster.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the desired
      cluster name
  @rtype: int
  @return: the desired exit code
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  """
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  if not opts.lvm_storage and opts.vg_name:
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    ToStderr("Options --no-lvm-storage and --vg-name conflict.")
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    return 1

  vg_name = opts.vg_name
  if opts.lvm_storage and not opts.vg_name:
    vg_name = constants.DEFAULT_VG

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  if not opts.drbd_storage and opts.drbd_helper:
    ToStderr("Options --no-drbd-storage and --drbd-usermode-helper conflict.")
    return 1

  drbd_helper = opts.drbd_helper
  if opts.drbd_storage and not opts.drbd_helper:
    drbd_helper = constants.DEFAULT_DRBD_HELPER

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  master_netdev = opts.master_netdev
  if master_netdev is None:
    master_netdev = constants.DEFAULT_BRIDGE

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  hvlist = opts.enabled_hypervisors
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  if hvlist is None:
    hvlist = constants.DEFAULT_ENABLED_HYPERVISOR
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  hvlist = hvlist.split(",")
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  hvparams = dict(opts.hvparams)
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  beparams = opts.beparams
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  nicparams = opts.nicparams
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  # prepare beparams dict
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  beparams = objects.FillDict(constants.BEC_DEFAULTS, beparams)
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  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
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  # prepare nicparams dict
  nicparams = objects.FillDict(constants.NICC_DEFAULTS, nicparams)
  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)

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  # prepare ndparams dict
  if opts.ndparams is None:
    ndparams = dict(constants.NDC_DEFAULTS)
  else:
    ndparams = objects.FillDict(constants.NDC_DEFAULTS, opts.ndparams)
    utils.ForceDictType(ndparams, constants.NDS_PARAMETER_TYPES)

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  # prepare hvparams dict
  for hv in constants.HYPER_TYPES:
    if hv not in hvparams:
      hvparams[hv] = {}
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    hvparams[hv] = objects.FillDict(constants.HVC_DEFAULTS[hv], hvparams[hv])
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    utils.ForceDictType(hvparams[hv], constants.HVS_PARAMETER_TYPES)
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  if opts.candidate_pool_size is None:
    opts.candidate_pool_size = constants.MASTER_POOL_SIZE_DEFAULT

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  if opts.mac_prefix is None:
    opts.mac_prefix = constants.DEFAULT_MAC_PREFIX

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  uid_pool = opts.uid_pool
  if uid_pool is not None:
    uid_pool = uidpool.ParseUidPool(uid_pool)

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  if opts.prealloc_wipe_disks is None:
    opts.prealloc_wipe_disks = False

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  try:
    primary_ip_version = int(opts.primary_ip_version)
  except (ValueError, TypeError), err:
    ToStderr("Invalid primary ip version value: %s" % str(err))
    return 1

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  bootstrap.InitCluster(cluster_name=args[0],
                        secondary_ip=opts.secondary_ip,
                        vg_name=vg_name,
                        mac_prefix=opts.mac_prefix,
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                        master_netdev=master_netdev,
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                        file_storage_dir=opts.file_storage_dir,
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                        shared_file_storage_dir=opts.shared_file_storage_dir,
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                        enabled_hypervisors=hvlist,
                        hvparams=hvparams,
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                        beparams=beparams,
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                        nicparams=nicparams,
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                        ndparams=ndparams,
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                        candidate_pool_size=opts.candidate_pool_size,
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                        modify_etc_hosts=opts.modify_etc_hosts,
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                        modify_ssh_setup=opts.modify_ssh_setup,
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                        maintain_node_health=opts.maintain_node_health,
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                        drbd_helper=drbd_helper,
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                        uid_pool=uid_pool,
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                        default_iallocator=opts.default_iallocator,
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                        primary_ip_version=primary_ip_version,
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                        prealloc_wipe_disks=opts.prealloc_wipe_disks,
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                        )
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  op = opcodes.OpClusterPostInit()
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  SubmitOpCode(op, opts=opts)
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  return 0


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@UsesRPC
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def DestroyCluster(opts, args):
  """Destroy the cluster.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code
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  """
  if not opts.yes_do_it:
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    ToStderr("Destroying a cluster is irreversible. If you really want"
             " destroy this cluster, supply the --yes-do-it option.")
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    return 1

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  op = opcodes.OpClusterDestroy()
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  master = SubmitOpCode(op, opts=opts)
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  # if we reached this, the opcode didn't fail; we can proceed to
  # shutdown all the daemons
  bootstrap.FinalizeClusterDestroy(master)
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  return 0


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def RenameCluster(opts, args):
  """Rename the cluster.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the new cluster name
  @rtype: int
  @return: the desired exit code
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  """
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  cl = GetClient()

  (cluster_name, ) = cl.QueryConfigValues(["cluster_name"])

  new_name = args[0]
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  if not opts.force:
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    usertext = ("This will rename the cluster from '%s' to '%s'. If you are"
                " connected over the network to the cluster name, the"
                " operation is very dangerous as the IP address will be"
                " removed from the node and the change may not go through."
                " Continue?") % (cluster_name, new_name)
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    if not AskUser(usertext):
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      return 1

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  op = opcodes.OpClusterRename(name=new_name)
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  result = SubmitOpCode(op, opts=opts, cl=cl)

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  if result:
    ToStdout("Cluster renamed from '%s' to '%s'", cluster_name, result)
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  return 0


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def RedistributeConfig(opts, args):
  """Forces push of the cluster configuration.

  @param opts: the command line options selected by the user
  @type args: list
  @param args: empty list
  @rtype: int
  @return: the desired exit code

  """
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  op = opcodes.OpClusterRedistConf()
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  SubmitOrSend(op, opts)
  return 0


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def ShowClusterVersion(opts, args):
  """Write version of ganeti software to the standard output.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code
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  """
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  cl = GetClient()
  result = cl.QueryClusterInfo()
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  ToStdout("Software version: %s", result["software_version"])
  ToStdout("Internode protocol: %s", result["protocol_version"])
  ToStdout("Configuration format: %s", result["config_version"])
  ToStdout("OS api version: %s", result["os_api_version"])
  ToStdout("Export interface: %s", result["export_version"])
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  return 0


def ShowClusterMaster(opts, args):
  """Write name of master node to the standard output.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code
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  """
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  master = bootstrap.GetMaster()
  ToStdout(master)
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  return 0

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def _PrintGroupedParams(paramsdict, level=1, roman=False):
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  """Print Grouped parameters (be, nic, disk) by group.

  @type paramsdict: dict of dicts
  @param paramsdict: {group: {param: value, ...}, ...}
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  @type level: int
  @param level: Level of indention
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  """
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  indent = "  " * level
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  for item, val in sorted(paramsdict.items()):
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    if isinstance(val, dict):
      ToStdout("%s- %s:", indent, item)
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      _PrintGroupedParams(val, level=level + 1, roman=roman)
    elif roman and isinstance(val, int):
      ToStdout("%s  %s: %s", indent, item, compat.TryToRoman(val))
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    else:
      ToStdout("%s  %s: %s", indent, item, val)
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def ShowClusterConfig(opts, args):
  """Shows cluster information.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code

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  """
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  cl = GetClient()
  result = cl.QueryClusterInfo()
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  ToStdout("Cluster name: %s", result["name"])
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  ToStdout("Cluster UUID: %s", result["uuid"])
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  ToStdout("Creation time: %s", utils.FormatTime(result["ctime"]))
  ToStdout("Modification time: %s", utils.FormatTime(result["mtime"]))

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  ToStdout("Master node: %s", result["master"])
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  ToStdout("Architecture (this node): %s (%s)",
           result["architecture"][0], result["architecture"][1])
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  if result["tags"]:
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    tags = utils.CommaJoin(utils.NiceSort(result["tags"]))
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  else:
    tags = "(none)"

  ToStdout("Tags: %s", tags)

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  ToStdout("Default hypervisor: %s", result["default_hypervisor"])
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  ToStdout("Enabled hypervisors: %s",
           utils.CommaJoin(result["enabled_hypervisors"]))
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  ToStdout("Hypervisor parameters:")
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  _PrintGroupedParams(result["hvparams"])
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  ToStdout("OS-specific hypervisor parameters:")
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  _PrintGroupedParams(result["os_hvp"])

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  ToStdout("OS parameters:")
  _PrintGroupedParams(result["osparams"])

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  ToStdout("Hidden OSes: %s", utils.CommaJoin(result["hidden_os"]))
  ToStdout("Blacklisted OSes: %s", utils.CommaJoin(result["blacklisted_os"]))

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  ToStdout("Cluster parameters:")
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  ToStdout("  - candidate pool size: %s",
            compat.TryToRoman(result["candidate_pool_size"],
                              convert=opts.roman_integers))
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  ToStdout("  - master netdev: %s", result["master_netdev"])
  ToStdout("  - lvm volume group: %s", result["volume_group_name"])
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  if result["reserved_lvs"]:
    reserved_lvs = utils.CommaJoin(result["reserved_lvs"])
  else:
    reserved_lvs = "(none)"
  ToStdout("  - lvm reserved volumes: %s", reserved_lvs)
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  ToStdout("  - drbd usermode helper: %s", result["drbd_usermode_helper"])
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  ToStdout("  - file storage path: %s", result["file_storage_dir"])
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  ToStdout("  - shared file storage path: %s",
           result["shared_file_storage_dir"])
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  ToStdout("  - maintenance of node health: %s",
           result["maintain_node_health"])
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  ToStdout("  - uid pool: %s",
            uidpool.FormatUidPool(result["uid_pool"],
                                  roman=opts.roman_integers))
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  ToStdout("  - default instance allocator: %s", result["default_iallocator"])
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  ToStdout("  - primary ip version: %d", result["primary_ip_version"])
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  ToStdout("  - preallocation wipe disks: %s", result["prealloc_wipe_disks"])
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  ToStdout("Default node parameters:")
  _PrintGroupedParams(result["ndparams"], roman=opts.roman_integers)

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  ToStdout("Default instance parameters:")
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  _PrintGroupedParams(result["beparams"], roman=opts.roman_integers)
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  ToStdout("Default nic parameters:")
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  _PrintGroupedParams(result["nicparams"], roman=opts.roman_integers)
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  return 0


def ClusterCopyFile(opts, args):
  """Copy a file from master to some nodes.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the path of
      the file to be copied
  @rtype: int
  @return: the desired exit code
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  """
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  filename = args[0]
  if not os.path.exists(filename):
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    raise errors.OpPrereqError("No such filename '%s'" % filename,
                               errors.ECODE_INVAL)
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  cl = GetClient()

  cluster_name = cl.QueryConfigValues(["cluster_name"])[0]

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  results = GetOnlineNodes(nodes=opts.nodes, cl=cl, filter_master=True,
                           secondary_ips=opts.use_replication_network)
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  srun = ssh.SshRunner(cluster_name=cluster_name)
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  for node in results:
    if not srun.CopyFileToNode(node, filename):
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      ToStderr("Copy of file %s to node %s failed", filename, node)
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  return 0


def RunClusterCommand(opts, args):
  """Run a command on some nodes.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain the command to be run and its arguments
  @rtype: int
  @return: the desired exit code
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  """
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  cl = GetClient()
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  command = " ".join(args)
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  nodes = GetOnlineNodes(nodes=opts.nodes, cl=cl)
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  cluster_name, master_node = cl.QueryConfigValues(["cluster_name",
                                                    "master_node"])
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  srun = ssh.SshRunner(cluster_name=cluster_name)
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  # Make sure master node is at list end
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  if master_node in nodes:
    nodes.remove(master_node)
    nodes.append(master_node)

  for name in nodes:
    result = srun.Run(name, "root", command)
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    ToStdout("------------------------------------------------")
    ToStdout("node: %s", name)
    ToStdout("%s", result.output)
    ToStdout("return code = %s", result.exit_code)
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  return 0
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def VerifyCluster(opts, args):
  """Verify integrity of cluster, performing various test on nodes.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code
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  """
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  simulate = opts.simulate_errors
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  skip_checks = []
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  if opts.nodegroup is None:
    # Verify cluster config.
    op = opcodes.OpClusterVerifyConfig(verbose=opts.verbose,
                                       error_codes=opts.error_codes,
                                       debug_simulate_errors=simulate)
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    success, all_groups = SubmitOpCode(op, opts=opts)
  else:
    success = True
    all_groups = [opts.nodegroup]
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  if opts.skip_nplusone_mem:
    skip_checks.append(constants.VERIFY_NPLUSONE_MEM)
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  jex = JobExecutor(opts=opts, verbose=False)

  for group in all_groups:
    op = opcodes.OpClusterVerifyGroup(group_name=group,
                                      skip_checks=skip_checks,
                                      verbose=opts.verbose,
                                      error_codes=opts.error_codes,
                                      debug_simulate_errors=simulate)
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    jex.QueueJob("group " + group, op)
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  results = jex.GetResults()
  success &= compat.all(r[1][0] for r in results)

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  if success:
    return constants.EXIT_SUCCESS
  else:
    return constants.EXIT_FAILURE
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def VerifyDisks(opts, args):
  """Verify integrity of cluster disks.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code
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  """
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  cl = GetClient()

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  op = opcodes.OpClusterVerifyDisks()
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  result = SubmitOpCode(op, opts=opts, cl=cl)
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  if not isinstance(result, (list, tuple)) or len(result) != 3:
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    raise errors.ProgrammerError("Unknown result type for OpClusterVerifyDisks")
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  bad_nodes, instances, missing = result
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  retcode = constants.EXIT_SUCCESS
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  if bad_nodes:
    for node, text in bad_nodes.items():
      ToStdout("Error gathering data on node %s: %s",
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               node, utils.SafeEncode(text[-400:]))
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      retcode |= 1
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      ToStdout("You need to fix these nodes first before fixing instances")
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  if instances:
    for iname in instances:
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      if iname in missing:
        continue
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      op = opcodes.OpInstanceActivateDisks(instance_name=iname)
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      try:
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        ToStdout("Activating disks for instance '%s'", iname)
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        SubmitOpCode(op, opts=opts, cl=cl)
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      except errors.GenericError, err:
        nret, msg = FormatError(err)
        retcode |= nret
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        ToStderr("Error activating disks for instance %s: %s", iname, msg)
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  if missing:
    for iname, ival in missing.iteritems():
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      all_missing = compat.all(x[0] in bad_nodes for x in ival)
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      if all_missing:
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        ToStdout("Instance %s cannot be verified as it lives on"
                 " broken nodes", iname)
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      else:
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        ToStdout("Instance %s has missing logical volumes:", iname)
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        ival.sort()
        for node, vol in ival:
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          if node in bad_nodes:
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            ToStdout("\tbroken node %s /dev/%s", node, vol)
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          else:
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            ToStdout("\t%s /dev/%s", node, vol)
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    ToStdout("You need to run replace or recreate disks for all the above"
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             " instances, if this message persist after fixing nodes.")
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    retcode |= 1
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  return retcode


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def RepairDiskSizes(opts, args):
  """Verify sizes of cluster disks.

  @param opts: the command line options selected by the user
  @type args: list
  @param args: optional list of instances to restrict check to
  @rtype: int
  @return: the desired exit code

  """
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  op = opcodes.OpClusterRepairDiskSizes(instances=args)
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  SubmitOpCode(op, opts=opts)
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@UsesRPC
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def MasterFailover(opts, args):
  """Failover the master node.

  This command, when run on a non-master node, will cause the current
  master to cease being master, and the non-master to become new
  master.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code

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  """
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  if opts.no_voting:
    usertext = ("This will perform the failover even if most other nodes"
                " are down, or if this node is outdated. This is dangerous"
                " as it can lead to a non-consistent cluster. Check the"
                " gnt-cluster(8) man page before proceeding. Continue?")
    if not AskUser(usertext):
      return 1

  return bootstrap.MasterFailover(no_voting=opts.no_voting)
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def MasterPing(opts, args):
  """Checks if the master is alive.

  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code

  """
  try:
    cl = GetClient()
    cl.QueryClusterInfo()
    return 0
  except Exception: # pylint: disable-msg=W0703
    return 1


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def SearchTags(opts, args):
  """Searches the tags on all the cluster.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the tag pattern
  @rtype: int
  @return: the desired exit code

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  """
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  op = opcodes.OpTagsSearch(pattern=args[0])
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  result = SubmitOpCode(op, opts=opts)
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  if not result:
    return 1
  result = list(result)
  result.sort()
  for path, tag in result:
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    ToStdout("%s %s", path, tag)
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def _RenewCrypto(new_cluster_cert, new_rapi_cert, rapi_cert_filename,
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                 new_confd_hmac_key, new_cds, cds_filename,
                 force):
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  """Renews cluster certificates, keys and secrets.

  @type new_cluster_cert: bool
  @param new_cluster_cert: Whether to generate a new cluster certificate
  @type new_rapi_cert: bool
  @param new_rapi_cert: Whether to generate a new RAPI certificate
  @type rapi_cert_filename: string
  @param rapi_cert_filename: Path to file containing new RAPI certificate
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  @type new_confd_hmac_key: bool
  @param new_confd_hmac_key: Whether to generate a new HMAC key
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  @type new_cds: bool
  @param new_cds: Whether to generate a new cluster domain secret
  @type cds_filename: string
  @param cds_filename: Path to file containing new cluster domain secret
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  @type force: bool
  @param force: Whether to ask user for confirmation

  """
  if new_rapi_cert and rapi_cert_filename:
    ToStderr("Only one of the --new-rapi-certficate and --rapi-certificate"
             " options can be specified at the same time.")
    return 1

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  if new_cds and cds_filename:
    ToStderr("Only one of the --new-cluster-domain-secret and"
             " --cluster-domain-secret options can be specified at"
             " the same time.")
    return 1

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  if rapi_cert_filename:
    # Read and verify new certificate
    try:
      rapi_cert_pem = utils.ReadFile(rapi_cert_filename)

      OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM,
                                      rapi_cert_pem)
    except Exception, err: # pylint: disable-msg=W0703
      ToStderr("Can't load new RAPI certificate from %s: %s" %
               (rapi_cert_filename, str(err)))
      return 1

    try:
      OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, rapi_cert_pem)
    except Exception, err: # pylint: disable-msg=W0703
      ToStderr("Can't load new RAPI private key from %s: %s" %
               (rapi_cert_filename, str(err)))
      return 1

  else:
    rapi_cert_pem = None

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  if cds_filename:
    try:
      cds = utils.ReadFile(cds_filename)
    except Exception, err: # pylint: disable-msg=W0703
      ToStderr("Can't load new cluster domain secret from %s: %s" %
               (cds_filename, str(err)))
      return 1
  else:
    cds = None

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  if not force:
    usertext = ("This requires all daemons on all nodes to be restarted and"
                " may take some time. Continue?")
    if not AskUser(usertext):
      return 1

  def _RenewCryptoInner(ctx):
    ctx.feedback_fn("Updating certificates and keys")
    bootstrap.GenerateClusterCrypto(new_cluster_cert, new_rapi_cert,
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                                    new_confd_hmac_key,
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                                    new_cds,
                                    rapi_cert_pem=rapi_cert_pem,
                                    cds=cds)
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    files_to_copy = []

    if new_cluster_cert:
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      files_to_copy.append(constants.NODED_CERT_FILE)
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    if new_rapi_cert or rapi_cert_pem:
      files_to_copy.append(constants.RAPI_CERT_FILE)

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    if new_confd_hmac_key:
      files_to_copy.append(constants.CONFD_HMAC_KEY)
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    if new_cds or cds:
      files_to_copy.append(constants.CLUSTER_DOMAIN_SECRET_FILE)

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    if files_to_copy:
      for node_name in ctx.nonmaster_nodes:
        ctx.feedback_fn("Copying %s to %s" %
                        (", ".join(files_to_copy), node_name))
        for file_name in files_to_copy:
          ctx.ssh.CopyFileToNode(node_name, file_name)

  RunWhileClusterStopped(ToStdout, _RenewCryptoInner)

  ToStdout("All requested certificates and keys have been replaced."
           " Running \"gnt-cluster verify\" now is recommended.")

  return 0


def RenewCrypto(opts, args):
  """Renews cluster certificates, keys and secrets.

  """
  return _RenewCrypto(opts.new_cluster_cert,
                      opts.new_rapi_cert,
                      opts.rapi_cert,
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                      opts.new_confd_hmac_key,
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                      opts.new_cluster_domain_secret,
                      opts.cluster_domain_secret,
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                      opts.force)


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def SetClusterParams(opts, args):
  """Modify the cluster.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should be an empty list
  @rtype: int
  @return: the desired exit code
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  """
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  if not (not opts.lvm_storage or opts.vg_name or
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          not opts.drbd_storage or opts.drbd_helper or
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          opts.enabled_hypervisors or opts.hvparams or
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          opts.beparams or opts.nicparams or opts.ndparams or
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          opts.candidate_pool_size is not None or
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          opts.uid_pool is not None or
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          opts.maintain_node_health is not None or
          opts.add_uids is not None or
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          opts.remove_uids is not None or
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          opts.default_iallocator is not None or
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          opts.reserved_lvs is not None or
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          opts.master_netdev is not None or
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          opts.prealloc_wipe_disks is not None):
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    ToStderr("Please give at least one of the parameters.")
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    return 1

  vg_name = opts.vg_name
  if not opts.lvm_storage and opts.vg_name:
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    ToStderr("Options --no-lvm-storage and --vg-name conflict.")
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    return 1
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  if not opts.lvm_storage:
    vg_name = ""
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  drbd_helper = opts.drbd_helper
  if not opts.drbd_storage and opts.drbd_helper:
    ToStderr("Options --no-drbd-storage and --drbd-usermode-helper conflict.")
    return 1

  if not opts.drbd_storage:
    drbd_helper = ""

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  hvlist = opts.enabled_hypervisors
  if hvlist is not None:
    hvlist = hvlist.split(",")

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  # a list of (name, dict) we can pass directly to dict() (or [])
  hvparams = dict(opts.hvparams)
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  for hv_params in hvparams.values():
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    utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)
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  beparams = opts.beparams
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  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)
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  nicparams = opts.nicparams
  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)

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  ndparams = opts.ndparams
  if ndparams is not None:
    utils.ForceDictType(ndparams, constants.NDS_PARAMETER_TYPES)
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  mnh = opts.maintain_node_health

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  uid_pool = opts.uid_pool
  if uid_pool is not None:
    uid_pool = uidpool.ParseUidPool(uid_pool)

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  add_uids = opts.add_uids
  if add_uids is not None:
    add_uids = uidpool.ParseUidPool(add_uids)

  remove_uids = opts.remove_uids
  if remove_uids is not None:
    remove_uids = uidpool.ParseUidPool(remove_uids)

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  if opts.reserved_lvs is not None:
    if opts.reserved_lvs == "":
      opts.reserved_lvs = []
    else:
      opts.reserved_lvs = utils.UnescapeAndSplit(opts.reserved_lvs, sep=",")

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                                  hvparams=hvparams,
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                                  nicparams=nicparams,
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                                  candidate_pool_size=opts.candidate_pool_size,
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                                  maintain_node_health=mnh,
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                                  add_uids=add_uids,
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                                  master_netdev=opts.master_netdev,
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                                  reserved_lvs=opts.reserved_lvs)
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  SubmitOpCode(op, opts=opts)
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  return 0


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def QueueOps(opts, args):
  """Queue operations.

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  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the subcommand
  @rtype: int
  @return: the desired exit code

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  """
  command = args[0]
  client = GetClient()
  if command in ("drain", "undrain"):
    drain_flag = command == "drain"
    client.SetQueueDrainFlag(drain_flag)
  elif command == "info":
    result = client.QueryConfigValues(["drain_flag"])
    if result[0]:
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      val = "set"
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    else:
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      val = "unset"
    ToStdout("The drain flag is %s" % val)
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  else:
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    raise errors.OpPrereqError("Command '%s' is not valid." % command,
                               errors.ECODE_INVAL)
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  return 0

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def _ShowWatcherPause(until):
  if until is None or until < time.time():
    ToStdout("The watcher is not paused.")
  else:
    ToStdout("The watcher is paused until %s.", time.ctime(until))


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def WatcherOps(opts, args):
  """Watcher operations.

  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the subcommand
  @rtype: int
  @return: the desired exit code

  """
  command = args[0]
  client = GetClient()

  if command == "continue":
    client.SetWatcherPause(None)
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    ToStdout("The watcher is no longer paused.")
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  elif command == "pause":
    if len(args) < 2:
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      raise errors.OpPrereqError("Missing pause duration", errors.ECODE_INVAL)
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    result = client.SetWatcherPause(time.time() + ParseTimespec(args[1]))
    _ShowWatcherPause(result)
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  elif command == "info":
    result = client.QueryConfigValues(["watcher_pause"])
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    _ShowWatcherPause(result[0])
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  else:
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    raise errors.OpPrereqError("Command '%s' is not valid." % command,
                               errors.ECODE_INVAL)
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  return 0


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def _OobPower(opts, node_list, power):
  """Puts the node in the list to desired power state.

  @param opts: The command line options selected by the user
  @param node_list: The list of nodes to operate on
  @param power: True if they should be powered on, False otherwise
  @return: The success of the operation (none failed)

  """
  if power:
    command = constants.OOB_POWER_ON
  else:
    command = constants.OOB_POWER_OFF

  op = opcodes.OpOobCommand(node_names=node_list,
                            command=command,
                            ignore_status=True,
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                            timeout=opts.oob_timeout,
                            power_delay=opts.power_delay)
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  result = SubmitOpCode(op, opts=opts)
  errs = 0
  for node_result in result:
    (node_tuple, data_tuple) = node_result
    (_, node_name) = node_tuple
    (data_status, _) = data_tuple
    if data_status != constants.RS_NORMAL:
      assert data_status != constants.RS_UNAVAIL
      errs += 1
      ToStderr("There was a problem changing power for %s, please investigate",
               node_name)

  if errs > 0:
    return False

  return True


def _InstanceStart(opts, inst_list, start):
  """Puts the instances in the list to desired state.

  @param opts: The command line options selected by the user
  @param inst_list: The list of instances to operate on
  @param start: True if they should be started, False for shutdown
  @return: The success of the operation (none failed)

  """
  if start:
    opcls = opcodes.OpInstanceStartup
    text_submit, text_success, text_failed = ("startup", "started", "starting")
  else:
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    opcls = compat.partial(opcodes.OpInstanceShutdown,
                           timeout=opts.shutdown_timeout)
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    text_submit, text_success, text_failed = ("shutdown", "stopped", "stopping")

  jex = JobExecutor(opts=opts)

  for inst in inst_list:
    ToStdout("Submit %s of instance %s", text_submit, inst)
    op = opcls(instance_name=inst)
    jex.QueueJob(inst, op)

  results = jex.GetResults()
  bad_cnt = len([1 for (success, _) in results if not success])

  if bad_cnt == 0:
    ToStdout("All instances have been %s successfully", text_success)
  else:
    ToStderr("There were errors while %s instances:\n"
             "%d error(s) out of %d instance(s)", text_failed, bad_cnt,
             len(results))
    return False

  return True


class _RunWhenNodesReachableHelper:
  """Helper class to make shared internal state sharing easier.

  @ivar success: Indicates if all action_cb calls were successful

  """
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  def __init__(self, node_list, action_cb, node2ip, port, feedback_fn,
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               _ping_fn=netutils.TcpPing, _sleep_fn=time.sleep):
    """Init the object.

    @param node_list: The list of nodes to be reachable
    @param action_cb: Callback called when a new host is reachable
    @type node2ip: dict
    @param node2ip: Node to ip mapping
    @param port: The port to use for the TCP ping
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    @param feedback_fn: The function used for feedback
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    @param _ping_fn: Function to check reachabilty (for unittest use only)
    @param _sleep_fn: Function to sleep (for unittest use only)

    """
    self.down = set(node_list)
    self.up = set()
    self.node2ip = node2ip
    self.success = True
    self.action_cb = action_cb
    self.port = port
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    self.feedback_fn = feedback_fn
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    self._ping_fn = _ping_fn
    self._sleep_fn = _sleep_fn

  def __call__(self):
    """When called we run action_cb.

    @raises utils.RetryAgain: When there are still down nodes

    """
    if not self.action_cb(self.up):
      self.success = False

    if self.down:
      raise utils.RetryAgain()
    else:
      return self.success

  def Wait(self, secs):
    """Checks if a host is up or waits remaining seconds.

    @param secs: The secs remaining

    """
    start = time.time()
    for node in self.down:
      if self._ping_fn(self.node2ip[node], self.port, timeout=_EPO_PING_TIMEOUT,
                       live_port_needed=True):
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        self.feedback_fn("Node %s became available" % node)
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        self.up.add(node)
        self.down -= self.up
        # If we have a node available there is the possibility to run the
        # action callback successfully, therefore we don't wait and return
        return

    self._sleep_fn(max(0.0, start + secs - time.time()))


def _RunWhenNodesReachable(node_list, action_cb, interval):
  """Run action_cb when nodes become reachable.

  @param node_list: The list of nodes to be reachable
  @param action_cb: Callback called when a new host is reachable
  @param interval: The earliest time to retry

  """
  client = GetClient()
  cluster_info = client.QueryClusterInfo()
  if cluster_info["primary_ip_version"] == constants.IP4_VERSION:
    family = netutils.IPAddress.family
  else:
    family = netutils.IP6Address.family

  node2ip = dict((node, netutils.GetHostname(node, family=family).ip)
                 for node in node_list)

  port = netutils.GetDaemonPort(constants.NODED)
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  helper = _RunWhenNodesReachableHelper(node_list, action_cb, node2ip, port,
                                        ToStdout)
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  try:
    return utils.Retry(helper, interval, _EPO_REACHABLE_TIMEOUT,
                       wait_fn=helper.Wait)
  except utils.RetryTimeout:
    ToStderr("Time exceeded while waiting for nodes to become reachable"
             " again:\n  - %s", "  - ".join(helper.down))
    return False


def _MaybeInstanceStartup(opts, inst_map, nodes_online,
                          _instance_start_fn=_InstanceStart):
  """Start the instances conditional based on node_states.

  @param opts: The command line options selected by the user
  @param inst_map: A dict of inst -> nodes mapping
  @param nodes_online: A list of nodes online
  @param _instance_start_fn: Callback to start instances (unittest use only)
  @return: Success of the operation on all instances

  """
  start_inst_list = []
  for (inst, nodes) in inst_map.items():
    if not (nodes - nodes_online):
      # All nodes the instance lives on are back online
      start_inst_list.append(inst)

  for inst in start_inst_list:
    del inst_map[inst]

  if start_inst_list:
    return _instance_start_fn(opts, start_inst_list, True)

  return True


def _EpoOn(opts, full_node_list, node_list, inst_map):
  """Does the actual power on.

  @param opts: The command line options selected by the user
  @param full_node_list: All nodes to operate on (includes nodes not supporting
                         OOB)
  @param node_list: The list of nodes to operate on (all need to support OOB)
  @param inst_map: A dict of inst -> nodes mapping
  @return: The desired exit status

  """
  if node_list and not _OobPower(opts, node_list, False):
    ToStderr("Not all nodes seem to get back up, investigate and start"
             " manually if needed")

  # Wait for the nodes to be back up
  action_cb = compat.partial(_MaybeInstanceStartup, opts, dict(inst_map))

  ToStdout("Waiting until all nodes are available again")
  if not _RunWhenNodesReachable(full_node_list, action_cb, _EPO_PING_INTERVAL):
    ToStderr("Please investigate and start stopped instances manually")
    return constants.EXIT_FAILURE

  return constants.EXIT_SUCCESS


def _EpoOff(opts, node_list, inst_map):
  """Does the actual power off.

  @param opts: The command line options selected by the user
  @param node_list: The list of nodes to operate on (all need to support OOB)
  @param inst_map: A dict of inst -> nodes mapping
  @return: The desired exit status

  """
  if not _InstanceStart(opts, inst_map.keys(), False):
    ToStderr("Please investigate and stop instances manually before continuing")
    return constants.EXIT_FAILURE

  if not node_list:
    return constants.EXIT_SUCCESS

  if _OobPower(opts, node_list, False):
    return constants.EXIT_SUCCESS
  else:
    return constants.EXIT_FAILURE


def Epo(opts, args):
  """EPO operations.

  @param opts: the command line options selected by the user
  @type args: list
  @param args: should contain only one element, the subcommand
  @rtype: int
  @return: the desired exit code

  """
  if opts.groups and opts.show_all:
    ToStderr("Only one of --groups or --all are allowed")
    return constants.EXIT_FAILURE
  elif args and opts.show_all:
    ToStderr("Arguments in combination with --all are not allowed")
    return constants.EXIT_FAILURE

  client = GetClient()

  if opts.groups:
    node_query_list = itertools.chain(*client.QueryGroups(names=args,
                                                          fields=["node_list"],
                                                          use_locking=False))
  else:
    node_query_list = args

  result = client.QueryNodes(names=node_query_list,
                             fields=["name", "master", "pinst_list",
                                     "sinst_list", "powered", "offline"],
                             use_locking=False)
  node_list = []
  inst_map = {}
  for (idx, (node, master, pinsts, sinsts, powered,
             offline)) in enumerate(result):
    # Normalize the node_query_list as well
    if not opts.show_all:
      node_query_list[idx] = node
    if not offline:
      for inst in (pinsts + sinsts):
        if inst in inst_map:
          if not master:
            inst_map[inst].add(node)
        elif master:
          inst_map[inst] = set()
        else:
          inst_map[inst] = set([node])

    if master and opts.on:
      # We ignore the master for turning on the machines, in fact we are
      # already operating on the master at this point :)
      continue
    elif master and not opts.show_all:
      ToStderr("%s is the master node, please do a master-failover to another"
               " node not affected by the EPO or use --all if you intend to"
               " shutdown the whole cluster", node)
      return constants.EXIT_FAILURE
    elif powered is None:
      ToStdout("Node %s does not support out-of-band handling, it can not be"
               " handled in a fully automated manner", node)
    elif powered == opts.on:
      ToStdout("Node %s is already in desired power state, skipping", node)
    elif not offline or (offline and powered):
      node_list.append(node)

  if not opts.force and not ConfirmOperation(node_query_list, "nodes", "epo"):
    return constants.EXIT_FAILURE

  if opts.on:
    return _EpoOn(opts, node_query_list, node_list, inst_map)
  else:
    return _EpoOff(opts, node_list, inst_map)


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commands = {
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  'init': (
    InitCluster, [ArgHost(min=1, max=1)],
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    [BACKEND_OPT, CP_SIZE_OPT, ENABLED_HV_OPT, GLOBAL_FILEDIR_OPT,
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     HVLIST_OPT, MAC_PREFIX_OPT, MASTER_NETDEV_OPT, NIC_PARAMS_OPT,
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     NOLVM_STORAGE_OPT, NOMODIFY_ETCHOSTS_OPT, NOMODIFY_SSH_SETUP_OPT,
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     SECONDARY_IP_OPT, VG_NAME_OPT, MAINTAIN_NODE_HEALTH_OPT,
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     UIDPOOL_OPT, DRBD_HELPER_OPT, NODRBD_STORAGE_OPT,
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     DEFAULT_IALLOCATOR_OPT, PRIMARY_IP_VERSION_OPT, PREALLOC_WIPE_DISKS_OPT,