gnt_cluster.py 52.1 KB
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#
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#

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# Copyright (C) 2006, 2007, 2010, 2011, 2012 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=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
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from ganeti import pathutils
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ON_OPT = cli_option("--on", default=False,
                    action="store_true", dest="on",
                    help="Recover from an EPO")

GROUPS_OPT = cli_option("--groups", default=False,
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                        action="store_true", dest="groups",
                        help="Arguments are node groups instead of nodes")
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FORCE_FAILOVER = cli_option("--yes-do-it", dest="yes_do_it",
                            help="Override interactive check for --no-voting",
                            default=False, action="store_true")

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_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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  diskparams = dict(opts.diskparams)

  # check the disk template types here, as we cannot rely on the type check done
  # by the opcode parameter types
  diskparams_keys = set(diskparams.keys())
  if not (diskparams_keys <= constants.DISK_TEMPLATES):
    unknown = utils.NiceSort(diskparams_keys - constants.DISK_TEMPLATES)
    ToStderr("Disk templates unknown: %s" % utils.CommaJoin(unknown))
    return 1

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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_COMPAT)
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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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  # prepare diskparams dict
  for templ in constants.DISK_TEMPLATES:
    if templ not in diskparams:
      diskparams[templ] = {}
    diskparams[templ] = objects.FillDict(constants.DISK_DT_DEFAULTS[templ],
                                         diskparams[templ])
    utils.ForceDictType(diskparams[templ], constants.DISK_DT_TYPES)

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  # prepare ipolicy dict
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  ipolicy_raw = CreateIPolicyFromOpts(
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    ispecs_mem_size=opts.ispecs_mem_size,
    ispecs_cpu_count=opts.ispecs_cpu_count,
    ispecs_disk_count=opts.ispecs_disk_count,
    ispecs_disk_size=opts.ispecs_disk_size,
    ispecs_nic_count=opts.ispecs_nic_count,
    ipolicy_disk_templates=opts.ipolicy_disk_templates,
    ipolicy_vcpu_ratio=opts.ipolicy_vcpu_ratio,
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    ipolicy_spindle_ratio=opts.ipolicy_spindle_ratio,
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    fill_all=True)
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  ipolicy = objects.FillIPolicy(constants.IPOLICY_DEFAULTS, ipolicy_raw)
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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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  external_ip_setup_script = opts.use_external_mip_script
  if external_ip_setup_script is None:
    external_ip_setup_script = 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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  master_netmask = opts.master_netmask
  try:
    if master_netmask is not None:
      master_netmask = int(master_netmask)
  except (ValueError, TypeError), err:
    ToStderr("Invalid master netmask value: %s" % str(err))
    return 1

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  if opts.disk_state:
    disk_state = utils.FlatToDict(opts.disk_state)
  else:
    disk_state = {}

  hv_state = dict(opts.hv_state)

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  enabled_storage_types = opts.enabled_storage_types
  if enabled_storage_types is not None:
    enabled_storage_types = enabled_storage_types.split(",")
  else:
    enabled_storage_types = list(constants.DEFAULT_ENABLED_STORAGE_TYPES)

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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_netmask=master_netmask,
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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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                        diskparams=diskparams,
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                        ipolicy=ipolicy,
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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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                        use_external_mip_script=external_ip_setup_script,
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                        hv_state=hv_state,
                        disk_state=disk_state,
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                        enabled_storage_types=enabled_storage_types,
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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 ActivateMasterIp(opts, args):
  """Activates the master IP.

  """
  op = opcodes.OpClusterActivateMasterIp()
  SubmitOpCode(op)
  return 0


def DeactivateMasterIp(opts, args):
  """Deactivates the master IP.

  """
  if not opts.confirm:
    usertext = ("This will disable the master IP. All the open connections to"
                " the master IP will be closed. To reach the master you will"
                " need to use its node IP."
                " Continue?")
    if not AskUser(usertext):
      return 1

  op = opcodes.OpClusterDeactivateMasterIp()
  SubmitOpCode(op)
  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(query=True)
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  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(query=True)
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  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"])
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  ToStdout("  - master netmask: %s", result["master_netmask"])
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  ToStdout("  - use external master IP address setup script: %s",
           result["use_external_mip_script"])
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  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"]))
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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("  - OS search path: %s", utils.CommaJoin(pathutils.OS_SEARCH_PATH))
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  ToStdout("  - ExtStorage Providers search path: %s",
           utils.CommaJoin(pathutils.ES_SEARCH_PATH))
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  ToStdout("  - enabled storage types: %s",
           utils.CommaJoin(result["enabled_storage_types"]))
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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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  ToStdout("Default disk parameters:")
  _PrintGroupedParams(result["diskparams"], roman=opts.roman_integers)

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  ToStdout("Instance policy - limits for instances:")
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  for key in constants.IPOLICY_ISPECS:
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    ToStdout("  - %s", key)
    _PrintGroupedParams(result["ipolicy"][key], roman=opts.roman_integers)
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  ToStdout("  - enabled disk templates: %s",
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           utils.CommaJoin(result["ipolicy"][constants.IPOLICY_DTS]))
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  for key in constants.IPOLICY_PARAMETERS:
    ToStdout("  - %s: %s", key, result["ipolicy"][key])
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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,
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                           secondary_ips=opts.use_replication_network,
                           nodegroup=opts.nodegroup)
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  srun = ssh.SshRunner(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, nodegroup=opts.nodegroup)
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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:
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    result = srun.Run(name, constants.SSH_LOGIN_USER, command)
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    if opts.failure_only and result.exit_code == constants.EXIT_SUCCESS:
      # Do not output anything for successful commands
      continue

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    ToStdout("------------------------------------------------")
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    if opts.show_machine_names:
      for line in result.output.splitlines():
        ToStdout("%s: %s", name, line)
    else:
      ToStdout("node: %s", name)
      ToStdout("%s", result.output)
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    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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  skip_checks = []
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  if opts.skip_nplusone_mem:
    skip_checks.append(constants.VERIFY_NPLUSONE_MEM)
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  cl = GetClient()
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  op = opcodes.OpClusterVerify(verbose=opts.verbose,
                               error_codes=opts.error_codes,
                               debug_simulate_errors=opts.simulate_errors,
                               skip_checks=skip_checks,
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                               ignore_errors=opts.ignore_errors,
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                               group_name=opts.nodegroup)
  result = SubmitOpCode(op, cl=cl, opts=opts)
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  # Keep track of submitted jobs
  jex = JobExecutor(cl=cl, opts=opts)

  for (status, job_id) in result[constants.JOB_IDS_KEY]:
    jex.AddJobId(None, status, job_id)
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  results = jex.GetResults()
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  (bad_jobs, bad_results) = \
    map(len,
        # Convert iterators to lists
        map(list,
            # Count errors
            map(compat.partial(itertools.ifilterfalse, bool),
                # Convert result to booleans in a tuple
                zip(*((job_success, len(op_results) == 1 and op_results[0])
                      for (job_success, op_results) in results)))))

  if bad_jobs == 0 and bad_results == 0:
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    rcode = constants.EXIT_SUCCESS
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  else:
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    rcode = constants.EXIT_FAILURE
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    if bad_jobs > 0:
      ToStdout("%s job(s) failed while verifying the cluster.", bad_jobs)
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  return rcode
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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, cl=cl, opts=opts)

  # Keep track of submitted jobs
  jex = JobExecutor(cl=cl, opts=opts)

  for (status, job_id) in result[constants.JOB_IDS_KEY]:
    jex.AddJobId(None, status, job_id)
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  retcode = constants.EXIT_SUCCESS
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  for (status, result) in jex.GetResults():
    if not status:
      ToStdout("Job failed: %s", result)
      continue

    ((bad_nodes, instances, missing), ) = result

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    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 = constants.EXIT_FAILURE
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      ToStdout("You need to fix these nodes first before fixing instances")
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    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():
        all_missing = compat.all(x[0] in bad_nodes for x in ival)
        if all_missing:
          ToStdout("Instance %s cannot be verified as it lives on"
                   " broken nodes", iname)
        else:
          ToStdout("Instance %s has missing logical volumes:", iname)
          ival.sort()
          for node, vol in ival:
            if node in bad_nodes:
              ToStdout("\tbroken node %s /dev/%s", node, vol)
            else:
              ToStdout("\t%s /dev/%s", node, vol)

      ToStdout("You need to replace or recreate disks for all the above"
               " instances if this message persists after fixing broken nodes.")
      retcode = constants.EXIT_FAILURE
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    elif not instances:
      ToStdout("No disks need to be activated.")
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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 and not opts.yes_do_it:
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    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
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  except Exception: # pylint: disable=W0703
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    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 _ReadAndVerifyCert(cert_filename, verify_private_key=False):
  """Reads and verifies an X509 certificate.

  @type cert_filename: string
  @param cert_filename: the path of the file containing the certificate to
                        verify encoded in PEM format
  @type verify_private_key: bool
  @param verify_private_key: whether to verify the private key in addition to
                             the public certificate
  @rtype: string
  @return: a string containing the PEM-encoded certificate.

  """
  try:
    pem = utils.ReadFile(cert_filename)
  except IOError, err:
    raise errors.X509CertError(cert_filename,
                               "Unable to read certificate: %s" % str(err))

  try:
    OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, pem)
  except Exception, err:
    raise errors.X509CertError(cert_filename,
                               "Unable to load certificate: %s" % str(err))

  if verify_private_key:
    try:
      OpenSSL.crypto.load_privatekey(OpenSSL.crypto.FILETYPE_PEM, pem)
    except Exception, err:
      raise errors.X509CertError(cert_filename,
                                 "Unable to load private key: %s" % str(err))

  return pem


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def _RenewCrypto(new_cluster_cert, new_rapi_cert, # pylint: disable=R0911
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                 rapi_cert_filename, new_spice_cert, spice_cert_filename,
                 spice_cacert_filename, 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_spice_cert: bool
  @param new_spice_cert: Whether to generate a new SPICE certificate
  @type spice_cert_filename: string
  @param spice_cert_filename: Path to file containing new SPICE certificate
  @type spice_cacert_filename: string
  @param spice_cacert_filename: Path to file containing the certificate of the
                                CA that signed the SPICE 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:
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    ToStderr("Only one of the --new-rapi-certificate and --rapi-certificate"
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             " 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 new_spice_cert and (spice_cert_filename or spice_cacert_filename):
    ToStderr("When using --new-spice-certificate, the --spice-certificate"
             " and --spice-ca-certificate must not be used.")
    return 1
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  if bool(spice_cacert_filename) ^ bool(spice_cert_filename):
    ToStderr("Both --spice-certificate and --spice-ca-certificate must be"
             " specified.")
    return 1
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  rapi_cert_pem, spice_cert_pem, spice_cacert_pem = (None, None, None)
  try:
    if rapi_cert_filename:
      rapi_cert_pem = _ReadAndVerifyCert(rapi_cert_filename, True)
    if spice_cert_filename:
      spice_cert_pem = _ReadAndVerifyCert(spice_cert_filename, True)
      spice_cacert_pem = _ReadAndVerifyCert(spice_cacert_filename)
  except errors.X509CertError, err:
    ToStderr("Unable to load X509 certificate from %s: %s", err[0], err[1])
    return 1
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  if cds_filename:
    try:
      cds = utils.ReadFile(cds_filename)
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    except Exception, err: # pylint: disable=W0703
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      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")
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    bootstrap.GenerateClusterCrypto(new_cluster_cert,
                                    new_rapi_cert,
                                    new_spice_cert,
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                                    new_confd_hmac_key,
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                                    new_cds,
                                    rapi_cert_pem=rapi_cert_pem,
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                                    spice_cert_pem=spice_cert_pem,
                                    spice_cacert_pem=spice_cacert_pem,
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                                    cds=cds)
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    files_to_copy = []

    if new_cluster_cert:
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      files_to_copy.append(pathutils.NODED_CERT_FILE)
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    if new_rapi_cert or rapi_cert_pem:
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      files_to_copy.append(pathutils.RAPI_CERT_FILE)
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    if new_spice_cert or spice_cert_pem:
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      files_to_copy.append(pathutils.SPICE_CERT_FILE)
      files_to_copy.append(pathutils.SPICE_CACERT_FILE)
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    if new_confd_hmac_key:
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      files_to_copy.append(pathutils.CONFD_HMAC_KEY)
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    if new_cds or cds:
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      files_to_copy.append(pathutils.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_spice_cert,
                      opts.spice_cert,
                      opts.spice_cacert,
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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 opts.diskparams 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.master_netmask is not None or
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          opts.use_external_mip_script is not None or
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          opts.prealloc_wipe_disks is not None or
          opts.hv_state or
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          opts.enabled_storage_types or
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          opts.disk_state or
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          opts.ispecs_mem_size or
          opts.ispecs_cpu_count or
          opts.ispecs_disk_count or
          opts.ispecs_disk_size or
          opts.ispecs_nic_count or
          opts.ipolicy_disk_templates is not None or
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          opts.ipolicy_vcpu_ratio is not None or
          opts.ipolicy_spindle_ratio 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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  enabled_storage_types = opts.enabled_storage_types
  if enabled_storage_types is not None:
    enabled_storage_types = enabled_storage_types.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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  diskparams = dict(opts.diskparams)

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  for dt_params in diskparams.values():
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    utils.ForceDictType(dt_params, constants.DISK_DT_TYPES)

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  beparams = opts.beparams
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  utils.ForceDictType(beparams, constants.BES_PARAMETER_COMPAT)
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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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  ipolicy = CreateIPolicyFromOpts(
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    ispecs_mem_size=opts.ispecs_mem_size,
    ispecs_cpu_count=opts.ispecs_cpu_count,
    ispecs_disk_count=opts.ispecs_disk_count,
    ispecs_disk_size=opts.ispecs_disk_size,
    ispecs_nic_count=opts.ispecs_nic_count,
    ipolicy_disk_templates=opts.ipolicy_disk_templates,
    ipolicy_vcpu_ratio=opts.ipolicy_vcpu_ratio,
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    ipolicy_spindle_ratio=opts.ipolicy_spindle_ratio,
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    )
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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=",")