gnt-cluster 14.9 KB
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#!/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.


import sys
from optparse import make_option
import pprint
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import os.path
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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
from ganeti import ssconf
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def InitCluster(opts, args):
  """Initialize the cluster.

  Args:
    opts - class with options as members
    args - list of arguments, expected to be [clustername]

  """
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  if not opts.lvm_storage and opts.vg_name:
    print ("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

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  bootstrap.InitCluster(cluster_name=args[0],
                        secondary_ip=opts.secondary_ip,
                        hypervisor_type=opts.hypervisor_type,
                        vg_name=vg_name,
                        mac_prefix=opts.mac_prefix,
                        def_bridge=opts.def_bridge,
                        master_netdev=opts.master_netdev,
                        file_storage_dir=opts.file_storage_dir)
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  return 0


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

  Args:
    opts - class with options as members
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  """
  if not opts.yes_do_it:
    print ("Destroying a cluster is irreversibly. If you really want destroy"
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           " this cluster, supply the --yes-do-it option.")
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    return 1

  op = opcodes.OpDestroyCluster()
  SubmitOpCode(op)
  return 0


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

  Args:
    opts - class with options as members, we use force only
    args - list of arguments, expected to be [new_name]

  """
  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
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    if not AskUser(usertext):
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      return 1

  op = opcodes.OpRenameCluster(name=name)
  SubmitOpCode(op)
  return 0


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

  Args:
    opts - class with options as members

  """
  op = opcodes.OpQueryClusterInfo()
  result = SubmitOpCode(op)
  print ("Software version: %s" % result["software_version"])
  print ("Internode protocol: %s" % result["protocol_version"])
  print ("Configuration format: %s" % result["config_version"])
  print ("OS api version: %s" % result["os_api_version"])
  print ("Export interface: %s" % result["export_version"])
  return 0


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

  Args:
    opts - class with options as members

  """
  op = opcodes.OpQueryClusterInfo()
  result = SubmitOpCode(op)
  print (result["master"])
  return 0


def ShowClusterConfig(opts, args):
  """Shows cluster information.

  """
  op = opcodes.OpQueryClusterInfo()
  result = SubmitOpCode(op)

  print ("Cluster name: %s" % result["name"])

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

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  print ("Architecture (this node): %s (%s)" %
         (result["architecture"][0], result["architecture"][1]))
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  print ("Cluster hypervisor: %s" % result["hypervisor_type"])

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  return 0


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

  Args:
    opts - class with options as members
    args - list containing a single element, the file name
  Opts used:
    nodes - list containing the name of target nodes; if empty, all nodes

  """
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  filename = args[0]
  if not os.path.exists(filename):
    raise errors.OpPrereqError("No such filename '%s'" % filename)

  myname = utils.HostInfo().name

  op = opcodes.OpQueryNodes(output_fields=["name"], names=opts.nodes)
  results = [row[0] for row in SubmitOpCode(op) if row[0] != myname]
  srun = ssh.SshRunner()
  for node in results:
    if not srun.CopyFileToNode(node, filename):
      print >> sys.stderr, ("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.

  Args:
    opts - class with options as members
    args - the command list as a list
  Opts used:
    nodes: list containing the name of target nodes; if empty, all nodes

  """
  command = " ".join(args)
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  op = opcodes.OpQueryNodes(output_fields=["name"], names=opts.nodes)
  nodes = [row[0] for row in SubmitOpCode(op)]

  sstore = ssconf.SimpleStore()
  master_node = sstore.GetMasterNode()
  srun = ssh.SshRunner(sstore=sstore)

  if master_node in nodes:
    nodes.remove(master_node)
    nodes.append(master_node)

  for name in nodes:
    result = srun.Run(name, "root", command)
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    print ("------------------------------------------------")
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    print ("node: %s" % name)
    print ("%s" % result.output)
    print ("return code = %s" % result.exit_code)

  return 0
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def VerifyCluster(opts, args):
  """Verify integrity of cluster, performing various test on nodes.

  Args:
    opts - class with options as members

  """
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  skip_checks = []
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  if opts.skip_nplusone_mem:
    skip_checks.append(constants.VERIFY_NPLUSONE_MEM)
  op = opcodes.OpVerifyCluster(skip_checks=skip_checks)
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  result = SubmitOpCode(op)
  return result


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def VerifyDisks(opts, args):
  """Verify integrity of cluster disks.

  Args:
    opts - class with options as members

  """
  op = opcodes.OpVerifyDisks()
  result = SubmitOpCode(op)
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  if not isinstance(result, tuple) or len(result) != 4:
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    raise errors.ProgrammerError("Unknown result type for OpVerifyDisks")

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  nodes, nlvm, instances, missing = result

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  if nodes:
    print "Nodes unreachable or with bad data:"
    for name in nodes:
      print "\t%s" % name
  retcode = constants.EXIT_SUCCESS
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  if nlvm:
    for node, text in nlvm.iteritems():
      print ("Error on node %s: LVM error: %s" %
             (node, text[-400:].encode('string_escape')))
      retcode |= 1
      print "You need to fix these nodes first before fixing instances"

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  if instances:
    for iname in instances:
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      if iname in missing:
        continue
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      op = opcodes.OpActivateInstanceDisks(instance_name=iname)
      try:
        print "Activating disks for instance '%s'" % iname
        SubmitOpCode(op)
      except errors.GenericError, err:
        nret, msg = FormatError(err)
        retcode |= nret
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        print >> sys.stderr, ("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 nlvm)
      if all_missing:
        print ("Instance %s cannot be verified as it lives on"
               " broken nodes" % iname)
      else:
        print "Instance %s has missing logical volumes:" % iname
        ival.sort()
        for node, vol in ival:
          if node in nlvm:
            print ("\tbroken node %s /dev/xenvg/%s" % (node, vol))
          else:
            print ("\t%s /dev/xenvg/%s" % (node, vol))
    print ("You need to run replace_disks for all the above"
           " instances, if this message persist after fixing nodes.")
    retcode |= 1
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  return retcode


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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.

  """
  op = opcodes.OpMasterFailover()
  SubmitOpCode(op)


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

  """
  op = opcodes.OpSearchTags(pattern=args[0])
  result = SubmitOpCode(op)
  if not result:
    return 1
  result = list(result)
  result.sort()
  for path, tag in result:
    print "%s %s" % (path, tag)


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

  Args:
    opts - class with options as members

  """
  if not (not opts.lvm_storage or opts.vg_name):
    print "Please give at least one of the parameters."
    return 1

  vg_name = opts.vg_name
  if not opts.lvm_storage and opts.vg_name:
    print ("Options --no-lvm-storage and --vg-name conflict.")
    return 1

  op = opcodes.OpSetClusterParams(vg_name=opts.vg_name)
  SubmitOpCode(op)
  return 0


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# this is an option common to more than one command, so we declare
# it here and reuse it
node_option = make_option("-n", "--node", action="append", dest="nodes",
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                          help="Node to copy to (if not given, all nodes),"
                               " can be given multiple times",
                          metavar="<node>", default=[])
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commands = {
  'init': (InitCluster, ARGS_ONE,
           [DEBUG_OPT,
            make_option("-s", "--secondary-ip", dest="secondary_ip",
                        help="Specify the secondary ip for this node;"
                        " if given, the entire cluster must have secondary"
                        " addresses",
                        metavar="ADDRESS", default=None),
            make_option("-t", "--hypervisor-type", dest="hypervisor_type",
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                        help="Specify the hypervisor type "
                        "(xen-3.0, fake, xen-hvm-3.1)",
                        metavar="TYPE", choices=["xen-3.0",
                                                 "fake",
                                                 "xen-hvm-3.1"],
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                        default="xen-3.0",),
            make_option("-m", "--mac-prefix", dest="mac_prefix",
                        help="Specify the mac prefix for the instance IP"
                        " addresses, in the format XX:XX:XX",
                        metavar="PREFIX",
                        default="aa:00:00",),
            make_option("-g", "--vg-name", dest="vg_name",
                        help="Specify the volume group name "
                        " (cluster-wide) for disk allocation [xenvg]",
                        metavar="VG",
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                        default=None,),
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            make_option("-b", "--bridge", dest="def_bridge",
                        help="Specify the default bridge name (cluster-wide)"
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                          " to connect the instances to [%s]" %
                          constants.DEFAULT_BRIDGE,
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                        metavar="BRIDGE",
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                        default=constants.DEFAULT_BRIDGE,),
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            make_option("--master-netdev", dest="master_netdev",
                        help="Specify the node interface (cluster-wide)"
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                          " on which the master IP address will be added "
                          " [%s]" % constants.DEFAULT_BRIDGE,
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                        metavar="NETDEV",
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                        default=constants.DEFAULT_BRIDGE,),
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            make_option("--file-storage-dir", dest="file_storage_dir",
                        help="Specify the default directory (cluster-wide)"
                             " for storing the file-based disks [%s]" %
                             constants.DEFAULT_FILE_STORAGE_DIR,
                        metavar="DIR",
                        default=constants.DEFAULT_FILE_STORAGE_DIR,),
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            make_option("--no-lvm-storage", dest="lvm_storage",
                        help="No support for lvm based instances"
                             " (cluster-wide)",
                        action="store_false", default=True,),
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            ],
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           "[opts...] <cluster_name>",
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           "Initialises a new cluster configuration"),
  'destroy': (DestroyCluster, ARGS_NONE,
              [DEBUG_OPT,
               make_option("--yes-do-it", dest="yes_do_it",
                           help="Destroy cluster",
                           action="store_true"),
              ],
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              "", "Destroy cluster"),
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  'rename': (RenameCluster, ARGS_ONE, [DEBUG_OPT, FORCE_OPT],
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               "<new_name>",
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               "Renames the cluster"),
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  'verify': (VerifyCluster, ARGS_NONE, [DEBUG_OPT,
             make_option("--no-nplus1-mem", dest="skip_nplusone_mem",
                         help="Skip N+1 memory redundancy tests",
                         action="store_true",
                         default=False,),
             ],
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             "", "Does a check on the cluster configuration"),
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  'verify-disks': (VerifyDisks, ARGS_NONE, [DEBUG_OPT],
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                   "", "Does a check on the cluster disk status"),
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  'masterfailover': (MasterFailover, ARGS_NONE, [DEBUG_OPT],
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                     "", "Makes the current node the master"),
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  'version': (ShowClusterVersion, ARGS_NONE, [DEBUG_OPT],
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              "", "Shows the cluster version"),
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  'getmaster': (ShowClusterMaster, ARGS_NONE, [DEBUG_OPT],
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                "", "Shows the cluster master"),
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  'copyfile': (ClusterCopyFile, ARGS_ONE, [DEBUG_OPT, node_option],
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               "[-n node...] <filename>",
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               "Copies a file to all (or only some) nodes"),
  'command': (RunClusterCommand, ARGS_ATLEAST(1), [DEBUG_OPT, node_option],
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              "[-n node...] <command>",
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              "Runs a command on all (or only some) nodes"),
  'info': (ShowClusterConfig, ARGS_NONE, [DEBUG_OPT],
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                 "", "Show cluster configuration"),
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  'list-tags': (ListTags, ARGS_NONE,
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                [DEBUG_OPT], "", "List the tags of the cluster"),
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  'add-tags': (AddTags, ARGS_ANY, [DEBUG_OPT, TAG_SRC_OPT],
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               "tag...", "Add tags to the cluster"),
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  'remove-tags': (RemoveTags, ARGS_ANY, [DEBUG_OPT, TAG_SRC_OPT],
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                  "tag...", "Remove tags from the cluster"),
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  'search-tags': (SearchTags, ARGS_ONE,
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                  [DEBUG_OPT], "", "Searches the tags on all objects on"
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                  " the cluster for a given pattern (regex)"),
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  'modify': (SetClusterParams, ARGS_NONE,
             [DEBUG_OPT,
              make_option("-g", "--vg-name", dest="vg_name",
                          help="Specify the volume group name "
                          " (cluster-wide) for disk allocation "
                          "and enable lvm based storage",
                          metavar="VG",),
              make_option("--no-lvm-storage", dest="lvm_storage",
                          help="Disable support for lvm based instances"
                               " (cluster-wide)",
                          action="store_false", default=True,),
              ],
             "[opts...]",
             "Alters the parameters of the cluster"),
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  }

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