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.

import sys

import os

from optparse import make_option

import textwrap

from cStringIO import StringIO

from ganeti.cli import *

from ganeti import opcodes

from ganeti import logger

from ganeti import constants

from ganeti import utils

def ListInstances(opts, args):

  """List nodes and their properties.

  """

  if opts.output is None:

    selected_fields = ["name", "os", "pnode", "admin_state",

                       "oper_state", "oper_ram"]

  else:

    selected_fields = opts.output.split(",")

  op = opcodes.OpQueryInstances(output_fields=selected_fields)

  output = SubmitOpCode(op)

  if not opts.no_headers:

    headers = {"name": "Instance", "os": "OS", "pnode": "Primary_node",

               "snodes": "Secondary_Nodes", "admin_state": "Autostart",

               "oper_state": "Status", "admin_ram": "Configured_memory",

               "oper_ram": "Memory", "disk_template": "Disk_template",

               "ip": "IP Address", "mac": "MAC Address",

               "bridge": "Bridge"}

  else:

    headers = None

  if opts.human_readable:

    unitfields = ["admin_ram", "oper_ram"]

  else:

    unitfields = None

  numfields = ["admin_ram", "oper_ram"]

  OutputTable(separator=opts.separator, headers=headers,

      fields=selected_fields, unitfields=unitfields,

      numfields=numfields, data=output)

  return 0

def AddInstance(opts, args):

  """Add an instance to the cluster.

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  Opts used:

    mem - amount of memory to allocate to instance (MiB)

    size - amount of disk space to allocate to instance (MiB)

    os - which OS to run on instance

    node - node to run new instance on

  """

  instance = args[0]

  op = opcodes.OpCreateInstance(instance_name=instance, mem_size=opts.mem,

                                disk_size=opts.size, swap_size=opts.swap,

                                disk_template=opts.disk_template,

                                mode=constants.INSTANCE_CREATE,

                                os_type=opts.os, pnode=opts.node,

                                snode=opts.snode, vcpus=opts.vcpus,

                                ip=opts.ip, bridge=opts.bridge, start=True,

                                wait_for_sync=opts.wait_for_sync)

  SubmitOpCode(op)

  return 0

def RemoveInstance(opts, args):

  """Remove an instance.

  Args:

    opts - class with options as members

    args - list containing a single element, the instance name

  """

  instance_name = args[0]

  force = opts.force

  if not force:

    usertext = ("This will remove the volumes of the instance %s"

                " (including mirrors), thus removing all the data"

                " of the instance. Continue?") % instance_name

    if not opts._ask_user(usertext):

      return 1

  op = opcodes.OpRemoveInstance(instance_name=instance_name)

  SubmitOpCode(op)

  return 0

def ActivateDisks(opts, args):

  """Activate an instance's disks.

  This serves two purposes:

    - it allows one (as long as the instance is not running) to mount

    the disks and modify them from the node

    - it repairs inactive secondary drbds

  """

  instance_name = args[0]

  op = opcodes.OpActivateInstanceDisks(instance_name=instance_name)

  disks_info = SubmitOpCode(op)

  for host, iname, nname in disks_info:

    print "%s:%s:%s" % (host, iname, nname)

  return 0

def DeactivateDisks(opts, args):

  """Command-line interface for _ShutdownInstanceBlockDevices.

  This function takes the instance name, looks for its primary node

  and the tries to shutdown its block devices on that node.

  """

  instance_name = args[0]

  op = opcodes.OpDeactivateInstanceDisks(instance_name=instance_name)

  SubmitOpCode(op)

  return 0

def StartupInstance(opts, args):

  """Shutdown an instance.

  Args:

    opts - class with options as members

    args - list containing a single element, the instance name

  """

  instance_name = args[0]

  op = opcodes.OpStartupInstance(instance_name=instance_name, force=opts.force,

                                 extra_args=opts.extra_args)

  SubmitOpCode(op)

  return 0

def ShutdownInstance(opts, args):

  """Shutdown an instance.

  Args:

    opts - class with options as members

    args - list containing a single element, the instance name

  """

  instance_name = args[0]

  op = opcodes.OpShutdownInstance(instance_name=instance_name)

  SubmitOpCode(op)

  return 0

def AddMDDRBDComponent(opts, args):

  """Add a new component to a remote_raid1 disk.

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  """

  op = opcodes.OpAddMDDRBDComponent(instance_name=args[0],

                                    disk_name=opts.disk,

                                    remote_node=opts.node)

  SubmitOpCode(op)

  return 0

def RemoveMDDRBDComponent(opts, args):

  """Connect to the console of an instance

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  """

  op = opcodes.OpRemoveMDDRBDComponent(instance_name=args[0],

                                       disk_name=opts.disk,

                                       disk_id=opts.port)

  SubmitOpCode(op)

  return 0

def ReplaceDisks(opts, args):

  """Replace the disks of an instance

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  """

  instance_name = args[0]

  new_secondary = opts.new_secondary

  op = opcodes.OpReplaceDisks(instance_name=args[0],

                              remote_node=opts.new_secondary)

  SubmitOpCode(op)

  return 0

def FailoverInstance(opts, args):

  """Failover an instance.

  The failover is done by shutting it down on its present node and

  starting it on the secondary.

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  Opts used:

    force - whether to failover without asking questions.

  """

  instance_name = args[0]

  force = opts.force

  if not force:

    usertext = ("Failover will happen to image %s."

                " This requires a shutdown of the instance. Continue?" %

                (instance_name,))

    usertext = textwrap.fill(usertext)

    if not opts._ask_user(usertext):

      return 1

  op = opcodes.OpFailoverInstance(instance_name=instance_name,

                                  ignore_consistency=opts.ignore_consistency)

  SubmitOpCode(op)

  return 0

def ConnectToInstanceConsole(opts, args):

  """Connect to the console of an instance.

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  """

  instance_name = args[0]

  op = opcodes.OpConnectConsole(instance_name=instance_name)

  node, console_cmd = SubmitOpCode(op)

  # drop lock and exec so other commands can run while we have console

  utils.Unlock("cmd")

  try:

    os.execv("/usr/bin/ssh", ["ssh", "-qt", node, console_cmd])

  finally:

    sys.stderr.write("Can't run console command %s on node %s" %

                     (console_cmd, node))

    os._exit(1)

def _FormatBlockDevInfo(buf, dev, indent_level):

  """Show block device information.

  This is only used by ShowInstanceConfig(), but it's too big to be

  left for an inline definition.

  """

  def helper(buf, dtype, status):

    """Format one line for phsyical device status."""

    if not status:

      buf.write("not active\n")

    else:

      (path, major, minor, syncp, estt, degr) = status

      buf.write("%s (%d:%d)" % (path, major, minor))

      if dtype in ("md_raid1", "drbd"):

        if syncp is not None:

          sync_text = "*RECOVERING* %5.2f%%," % syncp

          if estt:

            sync_text += " ETA %ds" % estt

          else:

            sync_text += " ETA unknown"

        else:

          sync_text = "in sync"

        if degr:

          degr_text = "*DEGRADED*"

        else:

          degr_text = "ok"

        buf.write(" %s, status %s" % (sync_text, degr_text))

      buf.write("\n")

  if dev["iv_name"] is not None:

    data = "  - %s, " % dev["iv_name"]

  else:

    data = "  - "

  data += "type: %s" % dev["dev_type"]

  if dev["logical_id"] is not None:

    data += ", logical_id: %s" % (dev["logical_id"],)

  elif dev["physical_id"] is not None:

    data += ", physical_id: %s" % (dev["physical_id"],)

  buf.write("%*s%s\n" % (2*indent_level, "", data))

  buf.write("%*s    primary:   " % (2*indent_level, ""))

  helper(buf, dev["dev_type"], dev["pstatus"])

  if dev["sstatus"]:

    buf.write("%*s    secondary: " % (2*indent_level, ""))

    helper(buf, dev["dev_type"], dev["sstatus"])

  if dev["children"]:

    for child in dev["children"]:

      _FormatBlockDevInfo(buf, child, indent_level+1)

def ShowInstanceConfig(opts, args):

  """Compute instance run-time status.

  """

  retcode = 0

  op = opcodes.OpQueryInstanceData(instances=args)

  result = SubmitOpCode(op)

  if not result:

    logger.ToStdout("No instances.")

    return 1

  buf = StringIO()

  retcode = 0

  for instance_name in result:

    instance = result[instance_name]

    buf.write("Instance name: %s\n" % instance["name"])

    buf.write("State: configured to be %s, actual state is %s\n" %

              (instance["config_state"], instance["run_state"]))

    buf.write("  Nodes:\n")

    buf.write("    - primary: %s\n" % instance["pnode"])

    buf.write("    - secondaries: %s\n" % ", ".join(instance["snodes"]))

    buf.write("  Operating system: %s\n" % instance["os"])

    buf.write("  Hardware:\n")

    buf.write("    - memory: %dMiB\n" % instance["memory"])

    buf.write("    - NICs: %s\n" %

        ", ".join(["{MAC: %s, IP: %s, bridge: %s}" %

                   (mac, ip, bridge)

                     for mac, ip, bridge in instance["nics"]]))

    buf.write("  Block devices:\n")

    for device in instance["disks"]:

      _FormatBlockDevInfo(buf, device, 1)

  logger.ToStdout(buf.getvalue().rstrip('\n'))

  return retcode

def SetInstanceParms(opts, args):

  """Modifies an instance.

  All parameters take effect only at the next restart of the instance.

  Args:

    opts - class with options as members

    args - list with a single element, the instance name

  Opts used:

    memory - the new memory size

    vcpus - the new number of cpus

  """

  if not opts.mem and not opts.vcpus and not opts.ip and not opts.bridge:

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

    return 1

  op = opcodes.OpSetInstanceParms(instance_name=args[0], mem=opts.mem,

                                  vcpus=opts.vcpus, ip=opts.ip,

                                  bridge=opts.bridge)

  result = SubmitOpCode(op)

  if result:

    logger.ToStdout("Modified instance %s" % args[0])

    for param, data in result:

      logger.ToStdout(" - %-5s -> %s" % (param, data))

    logger.ToStdout("Please don't forget that these parameters take effect"

                    " only at the next start of the instance.")

  return 0

# options used in more than one cmd

node_opt = make_option("-n", "--node", dest="node", help="Target node",

                       metavar="<node>")

force_opt = make_option("-f", "--force", dest="force", action="store_true",

                        default=False, help="Force the operation")

# this is defined separately due to readability only

add_opts = [

  DEBUG_OPT,

  node_opt,

  cli_option("-s", "--os-size", dest="size", help="Disk size",

             default=20 * 1024, type="unit", metavar="<size>"),

  cli_option("--swap-size", dest="swap", help="Swap size",

             default=4 * 1024, type="unit", metavar="<size>"),

  cli_option("-o", "--os-type", dest="os", help="What OS to run",

             metavar="<os>"),

  cli_option("-m", "--memory", dest="mem", help="Memory size",

              default=128, type="unit", metavar="<mem>"),

  make_option("-p", "--cpu", dest="vcpus", help="Number of virtual CPUs",

              default=1, type="int", metavar="<PROC>"),

  make_option("-t", "--disk-template", dest="disk_template",

              help="Custom disk setup (diskless, plain, local_raid1 or"

              " remote_raid1)", default=None, metavar="TEMPL"),

  make_option("-i", "--ip", dest="ip",

              help="IP address ('none' [default], 'auto', or specify address)",

              default='none', type="string", metavar="<ADDRESS>"),

  make_option("--no-wait-for-sync", dest="wait_for_sync", default=True,

              action="store_false", help="Don't wait for sync (DANGEROUS!)"),

  make_option("--secondary-node", dest="snode",

              help="Secondary node for remote_raid1 disk layout",

              metavar="<node>"),

  make_option("-b", "--bridge", dest="bridge",

              help="Bridge to connect this instance to",

              default=None, metavar="<bridge>")

  ]

commands = {

  'add': (AddInstance, ARGS_ONE, add_opts,

          "[opts...] <name>",

          "Creates and adds a new instance to the cluster"),

  'add-mirror': (AddMDDRBDComponent, ARGS_ONE,

                [DEBUG_OPT, node_opt,

                 make_option("-b", "--disk", dest="disk", metavar="sdX",

                             help=("The name of the instance disk for which to"

                                   " add the mirror"))],

                "-n node -b disk <instance>",

                "Creates a new mirror for the instance"),

  'console': (ConnectToInstanceConsole, ARGS_ONE, [DEBUG_OPT],

              "<instance>",

              "Opens a console on the specified instance"),

  'failover': (FailoverInstance, ARGS_ONE,

               [DEBUG_OPT, force_opt,

                make_option("--ignore-consistency", dest="ignore_consistency",

                            action="store_true", default=False,

                            help="Ignore the consistency of the disks on"

                            " the secondary"),

                ],

               "[-f] <instance>",

               "Stops the instance and starts it on the backup node, using"

               " the remote mirror (only for instances of type remote_raid1)"),

  'info': (ShowInstanceConfig, ARGS_ANY, [DEBUG_OPT], "[<instance>...]",

           "Show information on the specified instance"),

  'list': (ListInstances, ARGS_NONE,

           [DEBUG_OPT, NOHDR_OPT, SEP_OPT, USEUNITS_OPT, FIELDS_OPT],

           "", "Lists the instances and their status"),

  'remove': (RemoveInstance, ARGS_ONE, [DEBUG_OPT, force_opt],

             "[-f] <instance>", "Shuts down the instance and removes it"),

  'remove-mirror': (RemoveMDDRBDComponent, ARGS_ONE,

                   [DEBUG_OPT, node_opt,

                    make_option("-b", "--disk", dest="disk", metavar="sdX",

                                help=("The name of the instance disk"

                                      " for which to add the mirror")),

                    make_option("-p", "--port", dest="port", metavar="PORT",

                                help=("The port of the drbd device"

                                      " which to remove from the mirror"),

                                type="int"),

                    ],

                   "-b disk -p port <instance>",

                   "Removes a mirror from the instance"),

  'replace-disks': (ReplaceDisks, ARGS_ONE,

                    [DEBUG_OPT,

                     make_option("-n", "--new-secondary", dest="new_secondary",

                                 metavar="NODE",

                                 help=("New secondary node (if you want to"

                                       " change the secondary)"))],

                    "[-n NODE] <instance>",

                    "Replaces all disks for the instance"),

  'modify': (SetInstanceParms, ARGS_ONE,

             [DEBUG_OPT, force_opt,

              cli_option("-m", "--memory", dest="mem",

                         help="Memory size",

                         default=None, type="unit", metavar="<mem>"),

              make_option("-p", "--cpu", dest="vcpus",

                          help="Number of virtual CPUs",

                          default=None, type="int", metavar="<PROC>"),

              make_option("-i", "--ip", dest="ip",

                          help="IP address ('none' or numeric IP)",

                          default=None, type="string", metavar="<ADDRESS>"),

              make_option("-b", "--bridge", dest="bridge",

                          help="Bridge to connect this instance to",

                          default=None, type="string", metavar="<bridge>")

              ],

             "<instance>", "Alters the parameters of an instance"),

  'shutdown': (ShutdownInstance, ARGS_ONE, [DEBUG_OPT],

               "<instance>", "Stops an instance"),

  'startup': (StartupInstance, ARGS_ONE,

              [DEBUG_OPT, force_opt,

               make_option("-e", "--extra", dest="extra_args",

                           help="Extra arguments for the instance's kernel",

                           default=None, type="string", metavar="<PARAMS>"),

               ],

            "<instance>", "Starts an instance"),

  'activate-disks': (ActivateDisks, ARGS_ONE, [DEBUG_OPT],

                     "<instance>",

                     "Activate an instance's disks"),

  'deactivate-disks': (DeactivateDisks, ARGS_ONE, [DEBUG_OPT],

                       "<instance>",

                       "Deactivate an instance's disks"),

  }

if __name__ == '__main__':

  retcode = GenericMain(commands)

  sys.exit(retcode)