gnt-cluster

#!/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,W0613,W0614,C0103
# W0401: Wildcard import ganeti.cli
# W0613: Unused argument, since all functions follow the same API
# 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}))