Synnefo » snf-ganeti

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# General Public License for more details.

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"""Functions to bootstrap a new cluster.

"""

import os

import os.path

import re

import logging

import time

import tempfile

from ganeti import rpc

from ganeti import ssh

from ganeti import utils

from ganeti import errors

from ganeti import config

from ganeti import constants

from ganeti import objects

from ganeti import ssconf

from ganeti import serializer

from ganeti import hypervisor

from ganeti import bdev

from ganeti import netutils

from ganeti import luxi

from ganeti import jstore

from ganeti import pathutils

# ec_id for InitConfig's temporary reservation manager

_INITCONF_ECID = "initconfig-ecid"

#: After how many seconds daemon must be responsive

_DAEMON_READY_TIMEOUT = 10.0

def _InitSSHSetup():

  """Setup the SSH configuration for the cluster.

  This generates a dsa keypair for root, adds the pub key to the

  permitted hosts and adds the hostkey to its own known hosts.

  """

  priv_key, pub_key, auth_keys = ssh.GetUserFiles(constants.SSH_LOGIN_USER)

  for name in priv_key, pub_key:

    if os.path.exists(name):

      utils.CreateBackup(name)

    utils.RemoveFile(name)

  result = utils.RunCmd(["ssh-keygen", "-t", "dsa",

                         "-f", priv_key,

                         "-q", "-N", ""])

  if result.failed:

    raise errors.OpExecError("Could not generate ssh keypair, error %s" %

                             result.output)

  utils.AddAuthorizedKey(auth_keys, utils.ReadFile(pub_key))

def GenerateHmacKey(file_name):

  """Writes a new HMAC key.

  @type file_name: str

  @param file_name: Path to output file

  """

  utils.WriteFile(file_name, data="%s\n" % utils.GenerateSecret(), mode=0400,

                  backup=True)

def GenerateClusterCrypto(new_cluster_cert, new_rapi_cert, new_spice_cert,

                          new_confd_hmac_key, new_cds,

                          rapi_cert_pem=None, spice_cert_pem=None,

                          spice_cacert_pem=None, cds=None,

                          nodecert_file=pathutils.NODED_CERT_FILE,

                          rapicert_file=pathutils.RAPI_CERT_FILE,

                          spicecert_file=pathutils.SPICE_CERT_FILE,

                          spicecacert_file=pathutils.SPICE_CACERT_FILE,

                          hmackey_file=pathutils.CONFD_HMAC_KEY,

                          cds_file=pathutils.CLUSTER_DOMAIN_SECRET_FILE):

  """Updates the 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 new_spice_cert: bool

  @param new_spice_cert: Whether to generate a new SPICE certificate

  @type new_confd_hmac_key: bool

  @param new_confd_hmac_key: Whether to generate a new HMAC key

  @type new_cds: bool

  @param new_cds: Whether to generate a new cluster domain secret

  @type rapi_cert_pem: string

  @param rapi_cert_pem: New RAPI certificate in PEM format

  @type spice_cert_pem: string

  @param spice_cert_pem: New SPICE certificate in PEM format

  @type spice_cacert_pem: string

  @param spice_cacert_pem: Certificate of the CA that signed the SPICE

                           certificate, in PEM format

  @type cds: string

  @param cds: New cluster domain secret

  @type nodecert_file: string

  @param nodecert_file: optional override of the node cert file path

  @type rapicert_file: string

  @param rapicert_file: optional override of the rapi cert file path

  @type spicecert_file: string

  @param spicecert_file: optional override of the spice cert file path

  @type spicecacert_file: string

  @param spicecacert_file: optional override of the spice CA cert file path

  @type hmackey_file: string

  @param hmackey_file: optional override of the hmac key file path

  """

  # noded SSL certificate

  cluster_cert_exists = os.path.exists(nodecert_file)

  if new_cluster_cert or not cluster_cert_exists:

    if cluster_cert_exists:

      utils.CreateBackup(nodecert_file)

    logging.debug("Generating new cluster certificate at %s", nodecert_file)

    utils.GenerateSelfSignedSslCert(nodecert_file)

  # confd HMAC key

  if new_confd_hmac_key or not os.path.exists(hmackey_file):

    logging.debug("Writing new confd HMAC key to %s", hmackey_file)

    GenerateHmacKey(hmackey_file)

  # RAPI

  rapi_cert_exists = os.path.exists(rapicert_file)

  if rapi_cert_pem:

    # Assume rapi_pem contains a valid PEM-formatted certificate and key

    logging.debug("Writing RAPI certificate at %s", rapicert_file)

    utils.WriteFile(rapicert_file, data=rapi_cert_pem, backup=True)

  elif new_rapi_cert or not rapi_cert_exists:

    if rapi_cert_exists:

      utils.CreateBackup(rapicert_file)

    logging.debug("Generating new RAPI certificate at %s", rapicert_file)

    utils.GenerateSelfSignedSslCert(rapicert_file)

  # SPICE

  spice_cert_exists = os.path.exists(spicecert_file)

  spice_cacert_exists = os.path.exists(spicecacert_file)

  if spice_cert_pem:

    # spice_cert_pem implies also spice_cacert_pem

    logging.debug("Writing SPICE certificate at %s", spicecert_file)

    utils.WriteFile(spicecert_file, data=spice_cert_pem, backup=True)

    logging.debug("Writing SPICE CA certificate at %s", spicecacert_file)

    utils.WriteFile(spicecacert_file, data=spice_cacert_pem, backup=True)

  elif new_spice_cert or not spice_cert_exists:

    if spice_cert_exists:

      utils.CreateBackup(spicecert_file)

    if spice_cacert_exists:

      utils.CreateBackup(spicecacert_file)

    logging.debug("Generating new self-signed SPICE certificate at %s",

                  spicecert_file)

    (_, cert_pem) = utils.GenerateSelfSignedSslCert(spicecert_file)

    # Self-signed certificate -> the public certificate is also the CA public

    # certificate

    logging.debug("Writing the public certificate to %s",

                  spicecert_file)

    utils.io.WriteFile(spicecacert_file, mode=0400, data=cert_pem)

  # Cluster domain secret

  if cds:

    logging.debug("Writing cluster domain secret to %s", cds_file)

    utils.WriteFile(cds_file, data=cds, backup=True)

  elif new_cds or not os.path.exists(cds_file):

    logging.debug("Generating new cluster domain secret at %s", cds_file)

    GenerateHmacKey(cds_file)

def _InitGanetiServerSetup(master_name):

  """Setup the necessary configuration for the initial node daemon.

  This creates the nodepass file containing the shared password for

  the cluster, generates the SSL certificate and starts the node daemon.

  @type master_name: str

  @param master_name: Name of the master node

  """

  # Generate cluster secrets

  GenerateClusterCrypto(True, False, False, False, False)

  result = utils.RunCmd([pathutils.DAEMON_UTIL, "start", constants.NODED])

  if result.failed:

    raise errors.OpExecError("Could not start the node daemon, command %s"

                             " had exitcode %s and error %s" %

                             (result.cmd, result.exit_code, result.output))

  _WaitForNodeDaemon(master_name)

def _WaitForNodeDaemon(node_name):

  """Wait for node daemon to become responsive.

  """

  def _CheckNodeDaemon():

    # Pylint bug <http://www.logilab.org/ticket/35642>

    # pylint: disable=E1101

    result = rpc.BootstrapRunner().call_version([node_name])[node_name]

    if result.fail_msg:

      raise utils.RetryAgain()

  try:

    utils.Retry(_CheckNodeDaemon, 1.0, _DAEMON_READY_TIMEOUT)

  except utils.RetryTimeout:

    raise errors.OpExecError("Node daemon on %s didn't answer queries within"

                             " %s seconds" % (node_name, _DAEMON_READY_TIMEOUT))

def _WaitForMasterDaemon():

  """Wait for master daemon to become responsive.

  """

  def _CheckMasterDaemon():

    try:

      cl = luxi.Client()

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

    except Exception:

      raise utils.RetryAgain()

    logging.debug("Received cluster name %s from master", cluster_name)

  try:

    utils.Retry(_CheckMasterDaemon, 1.0, _DAEMON_READY_TIMEOUT)

  except utils.RetryTimeout:

    raise errors.OpExecError("Master daemon didn't answer queries within"

                             " %s seconds" % _DAEMON_READY_TIMEOUT)

def RunNodeSetupCmd(cluster_name, node, basecmd, debug, verbose,

                    use_cluster_key, ask_key, strict_host_check, data):

  """Runs a command to configure something on a remote machine.

  @type cluster_name: string

  @param cluster_name: Cluster name

  @type node: string

  @param node: Node name

  @type basecmd: string

  @param basecmd: Base command (path on the remote machine)

  @type debug: bool

  @param debug: Enable debug output

  @type verbose: bool

  @param verbose: Enable verbose output

  @type use_cluster_key: bool

  @param use_cluster_key: See L{ssh.SshRunner.BuildCmd}

  @type ask_key: bool

  @param ask_key: See L{ssh.SshRunner.BuildCmd}

  @type strict_host_check: bool

  @param strict_host_check: See L{ssh.SshRunner.BuildCmd}

  @param data: JSON-serializable input data for script (passed to stdin)

  """

  cmd = [basecmd]

  # Pass --debug/--verbose to the external script if set on our invocation

  if debug:

    cmd.append("--debug")

  if verbose:

    cmd.append("--verbose")

  family = ssconf.SimpleStore().GetPrimaryIPFamily()

  srun = ssh.SshRunner(cluster_name,

                       ipv6=(family == netutils.IP6Address.family))

  scmd = srun.BuildCmd(node, constants.SSH_LOGIN_USER,

                       utils.ShellQuoteArgs(cmd),

                       batch=False, ask_key=ask_key, quiet=False,

                       strict_host_check=strict_host_check,

                       use_cluster_key=use_cluster_key)

  tempfh = tempfile.TemporaryFile()

  try:

    tempfh.write(serializer.DumpJson(data))

    tempfh.seek(0)

    result = utils.RunCmd(scmd, interactive=True, input_fd=tempfh)

  finally:

    tempfh.close()

  if result.failed:

    raise errors.OpExecError("Command '%s' failed: %s" %

                             (result.cmd, result.fail_reason))

def _InitFileStorage(file_storage_dir):

  """Initialize if needed the file storage.

  @param file_storage_dir: the user-supplied value

  @return: either empty string (if file storage was disabled at build

      time) or the normalized path to the storage directory

  """

  file_storage_dir = os.path.normpath(file_storage_dir)

  if not os.path.isabs(file_storage_dir):

    raise errors.OpPrereqError("File storage directory '%s' is not an absolute"

                               " path" % file_storage_dir, errors.ECODE_INVAL)

  if not os.path.exists(file_storage_dir):

    try:

      os.makedirs(file_storage_dir, 0750)

    except OSError, err:

      raise errors.OpPrereqError("Cannot create file storage directory"

                                 " '%s': %s" % (file_storage_dir, err),

                                 errors.ECODE_ENVIRON)

  if not os.path.isdir(file_storage_dir):

    raise errors.OpPrereqError("The file storage directory '%s' is not"

                               " a directory." % file_storage_dir,

                               errors.ECODE_ENVIRON)

  return file_storage_dir

def InitCluster(cluster_name, mac_prefix, # pylint: disable=R0913, R0914

                master_netmask, master_netdev, file_storage_dir,

                shared_file_storage_dir, candidate_pool_size, secondary_ip=None,

                vg_name=None, beparams=None, nicparams=None, ndparams=None,

                hvparams=None, diskparams=None, enabled_hypervisors=None,

                modify_etc_hosts=True, modify_ssh_setup=True,

                maintain_node_health=False, drbd_helper=None, uid_pool=None,

                default_iallocator=None, primary_ip_version=None, ipolicy=None,

                prealloc_wipe_disks=False, use_external_mip_script=False,

                hv_state=None, disk_state=None):

  """Initialise the cluster.

  @type candidate_pool_size: int

  @param candidate_pool_size: master candidate pool size

  """

  # TODO: complete the docstring

  if config.ConfigWriter.IsCluster():

    raise errors.OpPrereqError("Cluster is already initialised",

                               errors.ECODE_STATE)

  if not enabled_hypervisors:

    raise errors.OpPrereqError("Enabled hypervisors list must contain at"

                               " least one member", errors.ECODE_INVAL)

  invalid_hvs = set(enabled_hypervisors) - constants.HYPER_TYPES

  if invalid_hvs:

    raise errors.OpPrereqError("Enabled hypervisors contains invalid"

                               " entries: %s" % invalid_hvs,

                               errors.ECODE_INVAL)

  try:

    ipcls = netutils.IPAddress.GetClassFromIpVersion(primary_ip_version)

  except errors.ProgrammerError:

    raise errors.OpPrereqError("Invalid primary ip version: %d." %

                               primary_ip_version, errors.ECODE_INVAL)

  hostname = netutils.GetHostname(family=ipcls.family)

  if not ipcls.IsValid(hostname.ip):

    raise errors.OpPrereqError("This host's IP (%s) is not a valid IPv%d"

                               " address." % (hostname.ip, primary_ip_version),

                               errors.ECODE_INVAL)

  if ipcls.IsLoopback(hostname.ip):

    raise errors.OpPrereqError("This host's IP (%s) resolves to a loopback"

                               " address. Please fix DNS or %s." %

                               (hostname.ip, pathutils.ETC_HOSTS),

                               errors.ECODE_ENVIRON)

  if not ipcls.Own(hostname.ip):

    raise errors.OpPrereqError("Inconsistency: this host's name resolves"

                               " to %s,\nbut this ip address does not"

                               " belong to this host" %

                               hostname.ip, errors.ECODE_ENVIRON)

  clustername = netutils.GetHostname(name=cluster_name, family=ipcls.family)

  if netutils.TcpPing(clustername.ip, constants.DEFAULT_NODED_PORT, timeout=5):

    raise errors.OpPrereqError("Cluster IP already active",

                               errors.ECODE_NOTUNIQUE)

  if not secondary_ip:

    if primary_ip_version == constants.IP6_VERSION:

      raise errors.OpPrereqError("When using a IPv6 primary address, a valid"

                                 " IPv4 address must be given as secondary",

                                 errors.ECODE_INVAL)

    secondary_ip = hostname.ip

  if not netutils.IP4Address.IsValid(secondary_ip):

    raise errors.OpPrereqError("Secondary IP address (%s) has to be a valid"

                               " IPv4 address." % secondary_ip,

                               errors.ECODE_INVAL)

  if not netutils.IP4Address.Own(secondary_ip):

    raise errors.OpPrereqError("You gave %s as secondary IP,"

                               " but it does not belong to this host." %

                               secondary_ip, errors.ECODE_ENVIRON)

  if master_netmask is not None:

    if not ipcls.ValidateNetmask(master_netmask):

      raise errors.OpPrereqError("CIDR netmask (%s) not valid for IPv%s " %

                                  (master_netmask, primary_ip_version),

                                 errors.ECODE_INVAL)

  else:

    master_netmask = ipcls.iplen

  if vg_name is not None:

    # Check if volume group is valid

    vgstatus = utils.CheckVolumeGroupSize(utils.ListVolumeGroups(), vg_name,

                                          constants.MIN_VG_SIZE)

    if vgstatus:

      raise errors.OpPrereqError("Error: %s\nspecify --no-lvm-storage if"

                                 " you are not using lvm" % vgstatus,

                                 errors.ECODE_INVAL)

  if drbd_helper is not None:

    try:

      curr_helper = bdev.BaseDRBD.GetUsermodeHelper()

    except errors.BlockDeviceError, err:

      raise errors.OpPrereqError("Error while checking drbd helper"

                                 " (specify --no-drbd-storage if you are not"

                                 " using drbd): %s" % str(err),

                                 errors.ECODE_ENVIRON)

    if drbd_helper != curr_helper:

      raise errors.OpPrereqError("Error: requiring %s as drbd helper but %s"

                                 " is the current helper" % (drbd_helper,

                                                             curr_helper),

                                 errors.ECODE_INVAL)

  if constants.ENABLE_FILE_STORAGE:

    file_storage_dir = _InitFileStorage(file_storage_dir)

  else:

    file_storage_dir = ""

  if constants.ENABLE_SHARED_FILE_STORAGE:

    shared_file_storage_dir = _InitFileStorage(shared_file_storage_dir)

  else:

    shared_file_storage_dir = ""

  if not re.match("^[0-9a-z]{2}:[0-9a-z]{2}:[0-9a-z]{2}$", mac_prefix):

    raise errors.OpPrereqError("Invalid mac prefix given '%s'" % mac_prefix,

                               errors.ECODE_INVAL)

  result = utils.RunCmd(["ip", "link", "show", "dev", master_netdev])

  if result.failed:

    raise errors.OpPrereqError("Invalid master netdev given (%s): '%s'" %

                               (master_netdev,

                                result.output.strip()), errors.ECODE_INVAL)

  dirs = [(pathutils.RUN_DIR, constants.RUN_DIRS_MODE)]

  utils.EnsureDirs(dirs)

  objects.UpgradeBeParams(beparams)

  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)

  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)

  objects.NIC.CheckParameterSyntax(nicparams)

  full_ipolicy = objects.FillIPolicy(constants.IPOLICY_DEFAULTS, ipolicy)

  if ndparams is not None:

    utils.ForceDictType(ndparams, constants.NDS_PARAMETER_TYPES)

  else:

    ndparams = dict(constants.NDC_DEFAULTS)

  # This is ugly, as we modify the dict itself

  # FIXME: Make utils.ForceDictType pure functional or write a wrapper

  # around it

  if hv_state:

    for hvname, hvs_data in hv_state.items():

      utils.ForceDictType(hvs_data, constants.HVSTS_PARAMETER_TYPES)

      hv_state[hvname] = objects.Cluster.SimpleFillHvState(hvs_data)

  else:

    hv_state = dict((hvname, constants.HVST_DEFAULTS)

                    for hvname in enabled_hypervisors)

  # FIXME: disk_state has no default values yet

  if disk_state:

    for storage, ds_data in disk_state.items():

      if storage not in constants.DS_VALID_TYPES:

        raise errors.OpPrereqError("Invalid storage type in disk state: %s" %

                                   storage, errors.ECODE_INVAL)

      for ds_name, state in ds_data.items():

        utils.ForceDictType(state, constants.DSS_PARAMETER_TYPES)

        ds_data[ds_name] = objects.Cluster.SimpleFillDiskState(state)

  # hvparams is a mapping of hypervisor->hvparams dict

  for hv_name, hv_params in hvparams.iteritems():

    utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)

    hv_class = hypervisor.GetHypervisor(hv_name)

    hv_class.CheckParameterSyntax(hv_params)

  # diskparams is a mapping of disk-template->diskparams dict

  for template, dt_params in diskparams.items():

    param_keys = set(dt_params.keys())

    default_param_keys = set(constants.DISK_DT_DEFAULTS[template].keys())

    if not (param_keys <= default_param_keys):

      unknown_params = param_keys - default_param_keys

      raise errors.OpPrereqError("Invalid parameters for disk template %s:"

                                 " %s" % (template,

                                          utils.CommaJoin(unknown_params)),

                                 errors.ECODE_INVAL)

    utils.ForceDictType(dt_params, constants.DISK_DT_TYPES)

  try:

    utils.VerifyDictOptions(diskparams, constants.DISK_DT_DEFAULTS)

  except errors.OpPrereqError, err:

    raise errors.OpPrereqError("While verify diskparam options: %s" % err,

                               errors.ECODE_INVAL)

  # set up ssh config and /etc/hosts

  sshline = utils.ReadFile(pathutils.SSH_HOST_RSA_PUB)

  sshkey = sshline.split(" ")[1]

  if modify_etc_hosts:

    utils.AddHostToEtcHosts(hostname.name, hostname.ip)

  if modify_ssh_setup:

    _InitSSHSetup()

  if default_iallocator is not None:

    alloc_script = utils.FindFile(default_iallocator,

                                  constants.IALLOCATOR_SEARCH_PATH,

                                  os.path.isfile)

    if alloc_script is None:

      raise errors.OpPrereqError("Invalid default iallocator script '%s'"

                                 " specified" % default_iallocator,

                                 errors.ECODE_INVAL)

  elif constants.HTOOLS:

    # htools was enabled at build-time, we default to it

    if utils.FindFile(constants.IALLOC_HAIL,

                      constants.IALLOCATOR_SEARCH_PATH,

                      os.path.isfile):

      default_iallocator = constants.IALLOC_HAIL

  now = time.time()

  # init of cluster config file

  cluster_config = objects.Cluster(

    serial_no=1,

    rsahostkeypub=sshkey,

    highest_used_port=(constants.FIRST_DRBD_PORT - 1),

    mac_prefix=mac_prefix,

    volume_group_name=vg_name,

    tcpudp_port_pool=set(),

    master_node=hostname.name,

    master_ip=clustername.ip,

    master_netmask=master_netmask,

    master_netdev=master_netdev,

    cluster_name=clustername.name,

    file_storage_dir=file_storage_dir,

    shared_file_storage_dir=shared_file_storage_dir,

    enabled_hypervisors=enabled_hypervisors,

    beparams={constants.PP_DEFAULT: beparams},

    nicparams={constants.PP_DEFAULT: nicparams},

    ndparams=ndparams,

    hvparams=hvparams,

    diskparams=diskparams,

    candidate_pool_size=candidate_pool_size,

    modify_etc_hosts=modify_etc_hosts,

    modify_ssh_setup=modify_ssh_setup,

    uid_pool=uid_pool,

    ctime=now,

    mtime=now,

    maintain_node_health=maintain_node_health,

    drbd_usermode_helper=drbd_helper,

    default_iallocator=default_iallocator,

    primary_ip_family=ipcls.family,

    prealloc_wipe_disks=prealloc_wipe_disks,

    use_external_mip_script=use_external_mip_script,

    ipolicy=full_ipolicy,

    hv_state_static=hv_state,

    disk_state_static=disk_state,

    )

  master_node_config = objects.Node(name=hostname.name,

                                    primary_ip=hostname.ip,

                                    secondary_ip=secondary_ip,

                                    serial_no=1,

                                    master_candidate=True,

                                    offline=False, drained=False,

                                    ctime=now, mtime=now,

                                    )

  InitConfig(constants.CONFIG_VERSION, cluster_config, master_node_config)

  cfg = config.ConfigWriter(offline=True)

  ssh.WriteKnownHostsFile(cfg, pathutils.SSH_KNOWN_HOSTS_FILE)

  cfg.Update(cfg.GetClusterInfo(), logging.error)

  ssconf.WriteSsconfFiles(cfg.GetSsconfValues())

  # set up the inter-node password and certificate

  _InitGanetiServerSetup(hostname.name)

  logging.debug("Starting daemons")

  result = utils.RunCmd([pathutils.DAEMON_UTIL, "start-all"])

  if result.failed:

    raise errors.OpExecError("Could not start daemons, command %s"

                             " had exitcode %s and error %s" %

                             (result.cmd, result.exit_code, result.output))

  _WaitForMasterDaemon()

def InitConfig(version, cluster_config, master_node_config,

               cfg_file=pathutils.CLUSTER_CONF_FILE):

  """Create the initial cluster configuration.

  It will contain the current node, which will also be the master

  node, and no instances.

  @type version: int

  @param version: configuration version

  @type cluster_config: L{objects.Cluster}

  @param cluster_config: cluster configuration

  @type master_node_config: L{objects.Node}

  @param master_node_config: master node configuration

  @type cfg_file: string

  @param cfg_file: configuration file path

  """

  uuid_generator = config.TemporaryReservationManager()

  cluster_config.uuid = uuid_generator.Generate([], utils.NewUUID,

                                                _INITCONF_ECID)

  master_node_config.uuid = uuid_generator.Generate([], utils.NewUUID,

                                                    _INITCONF_ECID)

  nodes = {

    master_node_config.name: master_node_config,

    }

  default_nodegroup = objects.NodeGroup(

    uuid=uuid_generator.Generate([], utils.NewUUID, _INITCONF_ECID),

    name=constants.INITIAL_NODE_GROUP_NAME,

    members=[master_node_config.name],

    diskparams={},

    )

  nodegroups = {

    default_nodegroup.uuid: default_nodegroup,

    }

  now = time.time()

  config_data = objects.ConfigData(version=version,

                                   cluster=cluster_config,

                                   nodegroups=nodegroups,

                                   nodes=nodes,

                                   instances={},

                                   networks={},

                                   serial_no=1,

                                   ctime=now, mtime=now)

  utils.WriteFile(cfg_file,

                  data=serializer.Dump(config_data.ToDict()),

                  mode=0600)

def FinalizeClusterDestroy(master):

  """Execute the last steps of cluster destroy

  This function shuts down all the daemons, completing the destroy

  begun in cmdlib.LUDestroyOpcode.

  """

  cfg = config.ConfigWriter()

  modify_ssh_setup = cfg.GetClusterInfo().modify_ssh_setup

  runner = rpc.BootstrapRunner()

  master_params = cfg.GetMasterNetworkParameters()

  master_params.name = master

  ems = cfg.GetUseExternalMipScript()

  result = runner.call_node_deactivate_master_ip(master_params.name,

                                                 master_params, ems)

  msg = result.fail_msg

  if msg:

    logging.warning("Could not disable the master IP: %s", msg)

  result = runner.call_node_stop_master(master)

  msg = result.fail_msg

  if msg:

    logging.warning("Could not disable the master role: %s", msg)

  result = runner.call_node_leave_cluster(master, modify_ssh_setup)

  msg = result.fail_msg

  if msg:

    logging.warning("Could not shutdown the node daemon and cleanup"

                    " the node: %s", msg)

def SetupNodeDaemon(opts, cluster_name, node):

  """Add a node to the cluster.

  This function must be called before the actual opcode, and will ssh

  to the remote node, copy the needed files, and start ganeti-noded,

  allowing the master to do the rest via normal rpc calls.

  @param cluster_name: the cluster name

  @param node: the name of the new node

  """

  data = {

    constants.NDS_CLUSTER_NAME: cluster_name,

    constants.NDS_NODE_DAEMON_CERTIFICATE:

      utils.ReadFile(pathutils.NODED_CERT_FILE),

    constants.NDS_SSCONF: ssconf.SimpleStore().ReadAll(),

    constants.NDS_START_NODE_DAEMON: True,

    }

  RunNodeSetupCmd(cluster_name, node, pathutils.NODE_DAEMON_SETUP,

                  opts.debug, opts.verbose,

                  True, opts.ssh_key_check, opts.ssh_key_check, data)

  _WaitForNodeDaemon(node)

def MasterFailover(no_voting=False):

  """Failover the master node.

  This checks that we are not already the master, and will cause the

  current master to cease being master, and the non-master to become

  new master.

  @type no_voting: boolean

  @param no_voting: force the operation without remote nodes agreement

                      (dangerous)

  """

  sstore = ssconf.SimpleStore()

  old_master, new_master = ssconf.GetMasterAndMyself(sstore)

  node_list = sstore.GetNodeList()

  mc_list = sstore.GetMasterCandidates()

  if old_master == new_master:

    raise errors.OpPrereqError("This commands must be run on the node"

                               " where you want the new master to be."

                               " %s is already the master" %

                               old_master, errors.ECODE_INVAL)

  if new_master not in mc_list:

    mc_no_master = [name for name in mc_list if name != old_master]

    raise errors.OpPrereqError("This node is not among the nodes marked"

                               " as master candidates. Only these nodes"

                               " can become masters. Current list of"

                               " master candidates is:\n"

                               "%s" % ("\n".join(mc_no_master)),

                               errors.ECODE_STATE)

  if not no_voting:

    vote_list = GatherMasterVotes(node_list)

    if vote_list:

      voted_master = vote_list[0][0]

      if voted_master is None:

        raise errors.OpPrereqError("Cluster is inconsistent, most nodes did"

                                   " not respond.", errors.ECODE_ENVIRON)

      elif voted_master != old_master:

        raise errors.OpPrereqError("I have a wrong configuration, I believe"

                                   " the master is %s but the other nodes"

                                   " voted %s. Please resync the configuration"

                                   " of this node." %

                                   (old_master, voted_master),

                                   errors.ECODE_STATE)

  # end checks

  rcode = 0

  logging.info("Setting master to %s, old master: %s", new_master, old_master)

  try:

    # instantiate a real config writer, as we now know we have the

    # configuration data

    cfg = config.ConfigWriter(accept_foreign=True)

    cluster_info = cfg.GetClusterInfo()

    cluster_info.master_node = new_master

    # this will also regenerate the ssconf files, since we updated the

    # cluster info

    cfg.Update(cluster_info, logging.error)

  except errors.ConfigurationError, err: