Synnefo » snf-ganeti

#!/usr/bin/python

#

# Copyright (C) 2006, 2007 Google Inc.

#

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

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

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

# (at your option) any later version.

#

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

# WITHOUT ANY WARRANTY; without even the implied warranty of

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

# General Public License for more details.

#

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

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

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

# 02110-1301, USA.

"""Cluster related commands"""

# pylint: disable-msg=W0401,W0614,C0103

# W0401: Wildcard import ganeti.cli

# W0614: Unused import %s from wildcard import (since we need cli)

# C0103: Invalid name gnt-cluster

import sys

import os.path

import time

from ganeti.cli import *

from ganeti import opcodes

from ganeti import constants

from ganeti import errors

from ganeti import utils

from ganeti import bootstrap

from ganeti import ssh

from ganeti import objects

@UsesRPC

def InitCluster(opts, args):

  """Initialize the cluster.

  @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

  """

  if not opts.lvm_storage and opts.vg_name:

    ToStderr("Options --no-lvm-storage and --vg-name conflict.")

    return 1

  vg_name = opts.vg_name

  if opts.lvm_storage and not opts.vg_name:

    vg_name = constants.DEFAULT_VG

  hvlist = opts.enabled_hypervisors

  if hvlist is None:

    hvlist = constants.DEFAULT_ENABLED_HYPERVISOR

  hvlist = hvlist.split(",")

  hvparams = dict(opts.hvparams)

  beparams = opts.beparams

  nicparams = opts.nicparams

  # prepare beparams dict

  beparams = objects.FillDict(constants.BEC_DEFAULTS, beparams)

  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)

  # prepare nicparams dict

  nicparams = objects.FillDict(constants.NICC_DEFAULTS, nicparams)

  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)

  # prepare hvparams dict

  for hv in constants.HYPER_TYPES:

    if hv not in hvparams:

      hvparams[hv] = {}

    hvparams[hv] = objects.FillDict(constants.HVC_DEFAULTS[hv], hvparams[hv])

    utils.ForceDictType(hvparams[hv], constants.HVS_PARAMETER_TYPES)

  if opts.candidate_pool_size is None:

    opts.candidate_pool_size = constants.MASTER_POOL_SIZE_DEFAULT

  if opts.mac_prefix is None:

    opts.mac_prefix = constants.DEFAULT_MAC_PREFIX

  bootstrap.InitCluster(cluster_name=args[0],

                        secondary_ip=opts.secondary_ip,

                        vg_name=vg_name,

                        mac_prefix=opts.mac_prefix,

                        master_netdev=opts.master_netdev,

                        file_storage_dir=opts.file_storage_dir,

                        enabled_hypervisors=hvlist,

                        hvparams=hvparams,

                        beparams=beparams,

                        nicparams=nicparams,

                        candidate_pool_size=opts.candidate_pool_size,

                        modify_etc_hosts=opts.modify_etc_hosts,

                        modify_ssh_setup=opts.modify_ssh_setup,

                        )

  op = opcodes.OpPostInitCluster()

  SubmitOpCode(op)

  return 0

@UsesRPC

def DestroyCluster(opts, args):

  """Destroy the cluster.

  @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

  """

  if not opts.yes_do_it:

    ToStderr("Destroying a cluster is irreversible. If you really want"

             " destroy this cluster, supply the --yes-do-it option.")

    return 1

  op = opcodes.OpDestroyCluster()

  master = SubmitOpCode(op)

  # if we reached this, the opcode didn't fail; we can proceed to

  # shutdown all the daemons

  bootstrap.FinalizeClusterDestroy(master)

  return 0

def RenameCluster(opts, args):

  """Rename the cluster.

  @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

  """

  name = args[0]

  if not opts.force:

    usertext = ("This will rename the cluster 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?") % name

    if not AskUser(usertext):

      return 1

  op = opcodes.OpRenameCluster(name=name)

  SubmitOpCode(op)

  return 0

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

  """

  op = opcodes.OpRedistributeConfig()

  SubmitOrSend(op, opts)

  return 0

def ShowClusterVersion(opts, args):

  """Write version of ganeti software to the standard output.

  @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

  """

  cl = GetClient()

  result = cl.QueryClusterInfo()

  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"])

  return 0

def ShowClusterMaster(opts, args):

  """Write name of master node to the standard output.

  @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

  """

  master = bootstrap.GetMaster()

  ToStdout(master)

  return 0

def _PrintGroupedParams(paramsdict):

  """Print Grouped parameters (be, nic, disk) by group.

  @type paramsdict: dict of dicts

  @param paramsdict: {group: {param: value, ...}, ...}

  """

  for gr_name, gr_dict in paramsdict.items():

    ToStdout("  - %s:", gr_name)

    for item, val in gr_dict.iteritems():

      ToStdout("      %s: %s", item, val)

def ShowClusterConfig(opts, args):

  """Shows cluster information.

  @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

  """

  cl = GetClient()

  result = cl.QueryClusterInfo()

  ToStdout("Cluster name: %s", result["name"])

  ToStdout("Cluster UUID: %s", result["uuid"])

  ToStdout("Creation time: %s", utils.FormatTime(result["ctime"]))

  ToStdout("Modification time: %s", utils.FormatTime(result["mtime"]))

  ToStdout("Master node: %s", result["master"])

  ToStdout("Architecture (this node): %s (%s)",

           result["architecture"][0], result["architecture"][1])

  if result["tags"]:

    tags = utils.CommaJoin(utils.NiceSort(result["tags"]))

  else:

    tags = "(none)"

  ToStdout("Tags: %s", tags)

  ToStdout("Default hypervisor: %s", result["default_hypervisor"])

  ToStdout("Enabled hypervisors: %s",

           utils.CommaJoin(result["enabled_hypervisors"]))

  ToStdout("Hypervisor parameters:")

  _PrintGroupedParams(result["hvparams"])

  ToStdout("Cluster parameters:")

  ToStdout("  - candidate pool size: %s", result["candidate_pool_size"])

  ToStdout("  - master netdev: %s", result["master_netdev"])

  ToStdout("  - lvm volume group: %s", result["volume_group_name"])

  ToStdout("  - file storage path: %s", result["file_storage_dir"])

  ToStdout("Default instance parameters:")

  _PrintGroupedParams(result["beparams"])

  ToStdout("Default nic parameters:")

  _PrintGroupedParams(result["nicparams"])

  return 0

def ClusterCopyFile(opts, args):

  """Copy a file from master to some nodes.

  @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

  """

  filename = args[0]

  if not os.path.exists(filename):

    raise errors.OpPrereqError("No such filename '%s'" % filename,

                               errors.ECODE_INVAL)

  cl = GetClient()

  myname = utils.GetHostInfo().name

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

  results = GetOnlineNodes(nodes=opts.nodes, cl=cl)

  results = [name for name in results if name != myname]

  srun = ssh.SshRunner(cluster_name=cluster_name)

  for node in results:

    if not srun.CopyFileToNode(node, filename):

      ToStderr("Copy of file %s to node %s failed", filename, node)

  return 0

def RunClusterCommand(opts, args):

  """Run a command on some nodes.

  @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

  """

  cl = GetClient()

  command = " ".join(args)

  nodes = GetOnlineNodes(nodes=opts.nodes, cl=cl)

  cluster_name, master_node = cl.QueryConfigValues(["cluster_name",

                                                    "master_node"])

  srun = ssh.SshRunner(cluster_name=cluster_name)

  # Make sure master node is at list end

  if master_node in nodes:

    nodes.remove(master_node)

    nodes.append(master_node)

  for name in nodes:

    result = srun.Run(name, "root", command)

    ToStdout("------------------------------------------------")

    ToStdout("node: %s", name)

    ToStdout("%s", result.output)

    ToStdout("return code = %s", result.exit_code)

  return 0

def VerifyCluster(opts, args):

  """Verify integrity of cluster, performing various test on nodes.

  @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

  """

  skip_checks = []

  if opts.skip_nplusone_mem:

    skip_checks.append(constants.VERIFY_NPLUSONE_MEM)

  op = opcodes.OpVerifyCluster(skip_checks=skip_checks,

                               verbose=opts.verbose,

                               error_codes=opts.error_codes,

                               debug_simulate_errors=opts.simulate_errors)

  if SubmitOpCode(op):

    return 0

  else:

    return 1

def VerifyDisks(opts, args):

  """Verify integrity of cluster disks.

  @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

  """

  op = opcodes.OpVerifyDisks()

  result = SubmitOpCode(op)

  if not isinstance(result, (list, tuple)) or len(result) != 3:

    raise errors.ProgrammerError("Unknown result type for OpVerifyDisks")

  bad_nodes, instances, missing = result

  retcode = constants.EXIT_SUCCESS

  if bad_nodes:

    for node, text in bad_nodes.items():

      ToStdout("Error gathering data on node %s: %s",

               node, utils.SafeEncode(text[-400:]))

      retcode |= 1

      ToStdout("You need to fix these nodes first before fixing instances")

  if instances:

    for iname in instances:

      if iname in missing:

        continue

      op = opcodes.OpActivateInstanceDisks(instance_name=iname)

      try:

        ToStdout("Activating disks for instance '%s'", iname)

        SubmitOpCode(op)

      except errors.GenericError, err:

        nret, msg = FormatError(err)

        retcode |= nret

        ToStderr("Error activating disks for instance %s: %s", iname, msg)

  if missing:

    for iname, ival in missing.iteritems():

      all_missing = utils.all(ival, lambda x: x[0] in bad_nodes)

      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/xenvg/%s", node, vol)

          else:

            ToStdout("\t%s /dev/xenvg/%s", node, vol)

    ToStdout("You need to run replace_disks for all the above"

           " instances, if this message persist after fixing nodes.")

    retcode |= 1

  return retcode

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

  """

  op = opcodes.OpRepairDiskSizes(instances=args)

  SubmitOpCode(op)

@UsesRPC

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.

  @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

  """

  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)

def SearchTags(opts, args):

  """Searches the tags on all the cluster.

  @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

  """

  op = opcodes.OpSearchTags(pattern=args[0])

  result = SubmitOpCode(op)

  if not result:

    return 1

  result = list(result)

  result.sort()

  for path, tag in result:

    ToStdout("%s %s", path, tag)

def SetClusterParams(opts, args):

  """Modify the cluster.

  @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

  """

  if not (not opts.lvm_storage or opts.vg_name or

          opts.enabled_hypervisors or opts.hvparams or

          opts.beparams or opts.nicparams or

          opts.candidate_pool_size is not None):

    ToStderr("Please give at least one of the parameters.")

    return 1

  vg_name = opts.vg_name

  if not opts.lvm_storage and opts.vg_name:

    ToStdout("Options --no-lvm-storage and --vg-name conflict.")

    return 1

  elif not opts.lvm_storage:

    vg_name = ''

  hvlist = opts.enabled_hypervisors

  if hvlist is not None:

    hvlist = hvlist.split(",")

  # a list of (name, dict) we can pass directly to dict() (or [])

  hvparams = dict(opts.hvparams)

  for hv_params in hvparams.values():

    utils.ForceDictType(hv_params, constants.HVS_PARAMETER_TYPES)

  beparams = opts.beparams

  utils.ForceDictType(beparams, constants.BES_PARAMETER_TYPES)

  nicparams = opts.nicparams

  utils.ForceDictType(nicparams, constants.NICS_PARAMETER_TYPES)

  op = opcodes.OpSetClusterParams(vg_name=vg_name,

                                  enabled_hypervisors=hvlist,

                                  hvparams=hvparams,

                                  beparams=beparams,

                                  nicparams=nicparams,

                                  candidate_pool_size=opts.candidate_pool_size)

  SubmitOpCode(op)

  return 0

def QueueOps(opts, args):

  """Queue 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 in ("drain", "undrain"):

    drain_flag = command == "drain"

    client.SetQueueDrainFlag(drain_flag)

  elif command == "info":

    result = client.QueryConfigValues(["drain_flag"])

    if result[0]:

      val = "set"

    else:

      val = "unset"

    ToStdout("The drain flag is %s" % val)

  else:

    raise errors.OpPrereqError("Command '%s' is not valid." % command,

                               errors.ECODE_INVAL)

  return 0

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))

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)

    ToStdout("The watcher is no longer paused.")

  elif command == "pause":

    if len(args) < 2:

      raise errors.OpPrereqError("Missing pause duration", errors.ECODE_INVAL)

    result = client.SetWatcherPause(time.time() + ParseTimespec(args[1]))

    _ShowWatcherPause(result)

  elif command == "info":

    result = client.QueryConfigValues(["watcher_pause"])

    _ShowWatcherPause(result)

  else:

    raise errors.OpPrereqError("Command '%s' is not valid." % command,

                               errors.ECODE_INVAL)

  return 0

commands = {

  'init': (

    InitCluster, [ArgHost(min=1, max=1)],

    [BACKEND_OPT, CP_SIZE_OPT, ENABLED_HV_OPT, GLOBAL_FILEDIR_OPT,

     HVLIST_OPT, MAC_PREFIX_OPT, MASTER_NETDEV_OPT, NIC_PARAMS_OPT,

     NOLVM_STORAGE_OPT, NOMODIFY_ETCHOSTS_OPT, NOMODIFY_SSH_SETUP_OPT,

     SECONDARY_IP_OPT, VG_NAME_OPT],

    "[opts...] <cluster_name>", "Initialises a new cluster configuration"),

  'destroy': (

    DestroyCluster, ARGS_NONE, [YES_DOIT_OPT],

    "", "Destroy cluster"),

  'rename': (

    RenameCluster, [ArgHost(min=1, max=1)],

    [FORCE_OPT],

    "<new_name>",

    "Renames the cluster"),

  'redist-conf': (

    RedistributeConfig, ARGS_NONE, [SUBMIT_OPT],

    "", "Forces a push of the configuration file and ssconf files"

    " to the nodes in the cluster"),

  'verify': (

    VerifyCluster, ARGS_NONE,

    [VERBOSE_OPT, DEBUG_SIMERR_OPT, ERROR_CODES_OPT, NONPLUS1_OPT],

    "", "Does a check on the cluster configuration"),

  'verify-disks': (

    VerifyDisks, ARGS_NONE, [],

    "", "Does a check on the cluster disk status"),

  'repair-disk-sizes': (

    RepairDiskSizes, ARGS_MANY_INSTANCES, [],

    "", "Updates mismatches in recorded disk sizes"),

  'masterfailover': (

    MasterFailover, ARGS_NONE, [NOVOTING_OPT],

    "", "Makes the current node the master"),

  'version': (

    ShowClusterVersion, ARGS_NONE, [],

    "", "Shows the cluster version"),

  'getmaster': (

    ShowClusterMaster, ARGS_NONE, [],

    "", "Shows the cluster master"),

  'copyfile': (

    ClusterCopyFile, [ArgFile(min=1, max=1)],

    [NODE_LIST_OPT],

    "[-n node...] <filename>", "Copies a file to all (or only some) nodes"),

  'command': (

    RunClusterCommand, [ArgCommand(min=1)],

    [NODE_LIST_OPT],

    "[-n node...] <command>", "Runs a command on all (or only some) nodes"),

  'info': (

    ShowClusterConfig, ARGS_NONE, [],

    "", "Show cluster configuration"),

  'list-tags': (

    ListTags, ARGS_NONE, [], "", "List the tags of the cluster"),

  'add-tags': (

    AddTags, [ArgUnknown()], [TAG_SRC_OPT],

    "tag...", "Add tags to the cluster"),

  'remove-tags': (

    RemoveTags, [ArgUnknown()], [TAG_SRC_OPT],

    "tag...", "Remove tags from the cluster"),

  'search-tags': (

    SearchTags, [ArgUnknown(min=1, max=1)],

    [], "", "Searches the tags on all objects on"

    " the cluster for a given pattern (regex)"),

  'queue': (

    QueueOps,

    [ArgChoice(min=1, max=1, choices=["drain", "undrain", "info"])],

    [], "drain|undrain|info", "Change queue properties"),

  'watcher': (

    WatcherOps,

    [ArgChoice(min=1, max=1, choices=["pause", "continue", "info"]),

     ArgSuggest(min=0, max=1, choices=["30m", "1h", "4h"])],

    [],

    "{pause <timespec>|continue|info}", "Change watcher properties"),

  'modify': (

    SetClusterParams, ARGS_NONE,

    [BACKEND_OPT, CP_SIZE_OPT, ENABLED_HV_OPT, HVLIST_OPT,

     NIC_PARAMS_OPT, NOLVM_STORAGE_OPT, VG_NAME_OPT],

    "[opts...]",

    "Alters the parameters of the cluster"),

  }

if __name__ == '__main__':

  sys.exit(GenericMain(commands, override={"tag_type": constants.TAG_CLUSTER}))