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.


import sys
from optparse import make_option
import pprint
import os.path

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 ssconf


def InitCluster(opts, args):
  """Initialize the cluster.

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

  """
  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

  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)
  return 0


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

  Args:
    opts - class with options as members

  """
  if not opts.yes_do_it:
    print ("Destroying a cluster is irreversibly. 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.

  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
    if not AskUser(usertext):
      return 1

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


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

  """
  print GetClient().QueryConfigValues(["master_node"])[0]
  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"])

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

  print ("Cluster hypervisor: %s" % result["hypervisor_type"])

  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

  """
  # TODO: Query master
  cfg = ssconf.SimpleConfigReader()

  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]

  # TODO: Potential inconsistency between local node and master
  srun = ssh.SshRunner(cfg)
  for node in results:
    if not srun.CopyFileToNode(node, filename):
      print >> sys.stderr, ("Copy of file %s to node %s failed" %
                            (filename, node))

  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

  """
  # TODO: Query master
  cfg = ssconf.SimpleConfigReader()

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

  # TODO: Potential inconsistency between local node and master
  master_node = cfg.GetMasterNode()
  srun = ssh.SshRunner(cfg)

  # 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)
    print ("------------------------------------------------")
    print ("node: %s" % name)
    print ("%s" % result.output)
    print ("return code = %s" % result.exit_code)

  return 0


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

  Args:
    opts - class with options as members

  """
  skip_checks = []
  if opts.skip_nplusone_mem:
    skip_checks.append(constants.VERIFY_NPLUSONE_MEM)
  op = opcodes.OpVerifyCluster(skip_checks=skip_checks)
  if SubmitOpCode(op):
    return 0
  else:
    return 1


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

  Args:
    opts - class with options as members

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

  nodes, nlvm, instances, missing = result

  if nodes:
    print "Nodes unreachable or with bad data:"
    for name in nodes:
      print "\t%s" % name
  retcode = constants.EXIT_SUCCESS

  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"

  if instances:
    for iname in instances:
      if iname in missing:
        continue
      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
        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

  return retcode


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.

  """
  return bootstrap.MasterFailover()


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)


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


# 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",
                          help="Node to copy to (if not given, all nodes),"
                               " can be given multiple times",
                          metavar="<node>", default=[])

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",
                        help="Specify the hypervisor type "
                        "(xen-3.0, kvm, fake, xen-hvm-3.1)",
                        metavar="TYPE", choices=["xen-3.0",
                                                 "kvm",
                                                 "fake",
                                                 "xen-hvm-3.1"],
                        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",
                        default=None,),
            make_option("-b", "--bridge", dest="def_bridge",
                        help="Specify the default bridge name (cluster-wide)"
                          " to connect the instances to [%s]" %
                          constants.DEFAULT_BRIDGE,
                        metavar="BRIDGE",
                        default=constants.DEFAULT_BRIDGE,),
            make_option("--master-netdev", dest="master_netdev",
                        help="Specify the node interface (cluster-wide)"
                          " on which the master IP address will be added "
                          " [%s]" % constants.DEFAULT_BRIDGE,
                        metavar="NETDEV",
                        default=constants.DEFAULT_BRIDGE,),
            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,),
            make_option("--no-lvm-storage", dest="lvm_storage",
                        help="No support for lvm based instances"
                             " (cluster-wide)",
                        action="store_false", default=True,),
            ],
           "[opts...] <cluster_name>",
           "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"),
              ],
              "", "Destroy cluster"),
  'rename': (RenameCluster, ARGS_ONE, [DEBUG_OPT, FORCE_OPT],
               "<new_name>",
               "Renames the cluster"),
  '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,),
             ],
             "", "Does a check on the cluster configuration"),
  'verify-disks': (VerifyDisks, ARGS_NONE, [DEBUG_OPT],
                   "", "Does a check on the cluster disk status"),
  'masterfailover': (MasterFailover, ARGS_NONE, [DEBUG_OPT],
                     "", "Makes the current node the master"),
  'version': (ShowClusterVersion, ARGS_NONE, [DEBUG_OPT],
              "", "Shows the cluster version"),
  'getmaster': (ShowClusterMaster, ARGS_NONE, [DEBUG_OPT],
                "", "Shows the cluster master"),
  'copyfile': (ClusterCopyFile, ARGS_ONE, [DEBUG_OPT, node_option],
               "[-n node...] <filename>",
               "Copies a file to all (or only some) nodes"),
  'command': (RunClusterCommand, ARGS_ATLEAST(1), [DEBUG_OPT, node_option],
              "[-n node...] <command>",
              "Runs a command on all (or only some) nodes"),
  'info': (ShowClusterConfig, ARGS_NONE, [DEBUG_OPT],
                 "", "Show cluster configuration"),
  'list-tags': (ListTags, ARGS_NONE,
                [DEBUG_OPT], "", "List the tags of the cluster"),
  'add-tags': (AddTags, ARGS_ANY, [DEBUG_OPT, TAG_SRC_OPT],
               "tag...", "Add tags to the cluster"),
  'remove-tags': (RemoveTags, ARGS_ANY, [DEBUG_OPT, TAG_SRC_OPT],
                  "tag...", "Remove tags from the cluster"),
  'search-tags': (SearchTags, ARGS_ONE,
                  [DEBUG_OPT], "", "Searches the tags on all objects on"
                  " the cluster for a given pattern (regex)"),
  '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"),
  }

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