Synnefo » snf-ganeti

#!/usr/bin/python

#

# Copyright (C) 2007, 2008, 2009 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.

# pylint: disable-msg=C0103,E1103

# C0103: invalid name NoDefault

# E1103: Instance of 'foor' has no 'bar' member (but some types could

# not be inferred)

"""Tool to upgrade the configuration file.

This code handles only the types supported by simplejson. As an

example, 'set' is a 'list'.

@note: this has lots of duplicate content with C{cfgupgrade}. Ideally, it

should be merged.

"""

import os

import os.path

import sys

import optparse

import logging

import errno

from ganeti import constants

from ganeti import serializer

from ganeti import utils

from ganeti import cli

options = None

args = None

# Unique object to identify calls without default value

NoDefault = object()

# Dictionary with instance old keys, and new hypervisor keys

INST_HV_CHG = {

  'hvm_pae': constants.HV_PAE,

  'vnc_bind_address': constants.HV_VNC_BIND_ADDRESS,

  'initrd_path': constants.HV_INITRD_PATH,

  'hvm_nic_type': constants.HV_NIC_TYPE,

  'kernel_path': constants.HV_KERNEL_PATH,

  'hvm_acpi': constants.HV_ACPI,

  'hvm_cdrom_image_path': constants.HV_CDROM_IMAGE_PATH,

  'hvm_boot_order': constants.HV_BOOT_ORDER,

  'hvm_disk_type': constants.HV_DISK_TYPE,

  }

# Instance beparams changes

INST_BE_CHG = {

  'vcpus': constants.BE_VCPUS,

  'memory': constants.BE_MEMORY,

  'auto_balance': constants.BE_AUTO_BALANCE,

  }

# Field names

F_SERIAL = 'serial_no'

class Error(Exception):

  """Generic exception"""

  pass

def SsconfName(key):

  """Returns the file name of an (old) ssconf key.

  """

  return "%s/ssconf_%s" % (options.data_dir, key)

def ReadFile(file_name, default=NoDefault):

  """Reads a file.

  """

  logging.debug("Reading %s", file_name)

  try:

    fh = open(file_name, 'r')

  except IOError, err:

    if default is not NoDefault and err.errno == errno.ENOENT:

      return default

    raise

  try:

    return fh.read()

  finally:

    fh.close()

def WriteFile(file_name, data):

  """Writes a configuration file.

  """

  logging.debug("Writing %s", file_name)

  utils.WriteFile(file_name=file_name, data=data, mode=0600,

                  dry_run=options.dry_run, backup=True)

def GenerateSecret(all_secrets):

  """Generate an unique DRBD secret.

  This is a copy from ConfigWriter.

  """

  retries = 64

  while retries > 0:

    secret = utils.GenerateSecret()

    if secret not in all_secrets:

      break

    retries -= 1

  else:

    raise Error("Can't generate unique DRBD secret")

  return secret

def SetupLogging():

  """Configures the logging module.

  """

  formatter = logging.Formatter("%(asctime)s: %(message)s")

  stderr_handler = logging.StreamHandler()

  stderr_handler.setFormatter(formatter)

  if options.debug:

    stderr_handler.setLevel(logging.NOTSET)

  elif options.verbose:

    stderr_handler.setLevel(logging.INFO)

  else:

    stderr_handler.setLevel(logging.CRITICAL)

  root_logger = logging.getLogger("")

  root_logger.setLevel(logging.NOTSET)

  root_logger.addHandler(stderr_handler)

def Cluster12To20(cluster):

  """Upgrades the cluster object from 1.2 to 2.0.

  """

  logging.info("Upgrading the cluster object")

  # Upgrade the configuration version

  if 'config_version' in cluster:

    del cluster['config_version']

  # Add old ssconf keys back to config

  logging.info(" - importing ssconf keys")

  for key in ('master_node', 'master_ip', 'master_netdev', 'cluster_name'):

    if key not in cluster:

      cluster[key] = ReadFile(SsconfName(key)).strip()

  if 'default_hypervisor' not in cluster:

    old_hyp = ReadFile(SsconfName('hypervisor')).strip()

    if old_hyp == "xen-3.0":

      hyp = "xen-pvm"

    elif old_hyp == "xen-hvm-3.1":

      hyp = "xen-hvm"

    elif old_hyp == "fake":

      hyp = "fake"

    else:

      raise Error("Unknown old hypervisor name '%s'" % old_hyp)

    logging.info("Setting the default and enabled hypervisor")

    cluster['default_hypervisor'] = hyp

    cluster['enabled_hypervisors'] = [hyp]

  # hv/be params

  if 'hvparams' not in cluster:

    logging.info(" - adding hvparams")

    cluster['hvparams'] = constants.HVC_DEFAULTS

  if 'beparams' not in cluster:

    logging.info(" - adding beparams")

    cluster['beparams'] = {constants.PP_DEFAULT: constants.BEC_DEFAULTS}

  # file storage

  if 'file_storage_dir' not in cluster:

    cluster['file_storage_dir'] = constants.DEFAULT_FILE_STORAGE_DIR

  # candidate pool size

  if 'candidate_pool_size' not in cluster:

    cluster['candidate_pool_size'] = constants.MASTER_POOL_SIZE_DEFAULT

def Node12To20(node):

  """Upgrades a node from 1.2 to 2.0.

  """

  logging.info("Upgrading node %s", node['name'])

  if F_SERIAL not in node:

    node[F_SERIAL] = 1

  if 'master_candidate' not in node:

    node['master_candidate'] = True

  for key in 'offline', 'drained':

    if key not in node:

      node[key] = False

def Instance12To20(drbd_minors, secrets, hypervisor, instance):

  """Upgrades an instance from 1.2 to 2.0.

  """

  if F_SERIAL not in instance:

    instance[F_SERIAL] = 1

  if 'hypervisor' not in instance:

    instance['hypervisor'] = hypervisor

  # hvparams changes

  if 'hvparams' not in instance:

    instance['hvparams'] = hvp = {}

  for old, new in INST_HV_CHG.items():

    if old in instance:

      if (instance[old] is not None and

          instance[old] != constants.VALUE_DEFAULT and # no longer valid in 2.0

          new in constants.HVC_DEFAULTS[hypervisor]):

        hvp[new] = instance[old]

      del instance[old]

  # beparams changes

  if 'beparams' not in instance:

    instance['beparams'] = bep = {}

  for old, new in INST_BE_CHG.items():

    if old in instance:

      if instance[old] is not None:

        bep[new] = instance[old]

      del instance[old]

  # disk changes

  for disk in instance['disks']:

    Disk12To20(drbd_minors, secrets, disk)

  # other instance changes

  if 'status' in instance:

    instance['admin_up'] = instance['status'] == 'up'

    del instance['status']

def Disk12To20(drbd_minors, secrets, disk):

  """Upgrades a disk from 1.2 to 2.0.

  """

  if 'mode' not in disk:

    disk['mode'] = constants.DISK_RDWR

  if disk['dev_type'] == constants.LD_DRBD8:

    old_lid = disk['logical_id']

    for node in old_lid[:2]:

      if node not in drbd_minors:

        raise Error("Can't find node '%s' while upgrading disk" % node)

      drbd_minors[node] += 1

      minor = drbd_minors[node]

      old_lid.append(minor)

    old_lid.append(GenerateSecret(secrets))

    del disk['physical_id']

  if disk['children']:

    for child in disk['children']:

      Disk12To20(drbd_minors, secrets, child)

def main():

  """Main program.

  """

  # pylint: disable-msg=W0603

  global options, args

  program = os.path.basename(sys.argv[0])

  # Option parsing

  parser = optparse.OptionParser(usage="%prog [--debug|--verbose] [--force]")

  parser.add_option('--dry-run', dest='dry_run',

                    action="store_true",

                    help="Try to do the conversion, but don't write"

                         " output file")

  parser.add_option(cli.FORCE_OPT)

  parser.add_option(cli.DEBUG_OPT)

  parser.add_option(cli.VERBOSE_OPT)

  parser.add_option('--path', help="Convert configuration in this"

                    " directory instead of '%s'" % constants.DATA_DIR,

                    default=constants.DATA_DIR, dest="data_dir")

  (options, args) = parser.parse_args()

  # We need to keep filenames locally because they might be renamed between

  # versions.

  options.data_dir = os.path.abspath(options.data_dir)

  options.CONFIG_DATA_PATH = options.data_dir + "/config.data"

  options.SERVER_PEM_PATH = options.data_dir + "/server.pem"

  options.KNOWN_HOSTS_PATH = options.data_dir + "/known_hosts"

  options.RAPI_CERT_FILE = options.data_dir + "/rapi.pem"

  SetupLogging()

  # Option checking

  if args:

    raise Error("No arguments expected")

  if not options.force:

    usertext = ("%s MUST be run on the master node. Is this the master"

                " node and are ALL instances down?" % program)

    if not cli.AskUser(usertext):

      sys.exit(1)

  # Check whether it's a Ganeti configuration directory

  if not (os.path.isfile(options.CONFIG_DATA_PATH) and

          os.path.isfile(options.SERVER_PEM_PATH) or

          os.path.isfile(options.KNOWN_HOSTS_PATH)):

    raise Error(("%s does not seem to be a known Ganeti configuration"

                 " directory") % options.data_dir)

  config_version = ReadFile(SsconfName('config_version'), "1.2").strip()

  logging.info("Found configuration version %s", config_version)

  config_data = serializer.LoadJson(ReadFile(options.CONFIG_DATA_PATH))

  # Ganeti 1.2?

  if config_version == "1.2":

    logging.info("Found a Ganeti 1.2 configuration")

    cluster = config_data["cluster"]

    old_config_version = cluster.get("config_version", None)

    logging.info("Found old configuration version %s", old_config_version)

    if old_config_version not in (3, ):

      raise Error("Unsupported configuration version: %s" %

                  old_config_version)

    if 'version' not in config_data:

      config_data['version'] = constants.BuildVersion(2, 0, 0)

    if F_SERIAL not in config_data:

      config_data[F_SERIAL] = 1

    # Make sure no instance uses remote_raid1 anymore

    remote_raid1_instances = []

    for instance in config_data["instances"].values():

      if instance["disk_template"] == "remote_raid1":

        remote_raid1_instances.append(instance["name"])

    if remote_raid1_instances:

      for name in remote_raid1_instances:

        logging.error("Instance %s still using remote_raid1 disk template",

                      name)

      raise Error("Unable to convert configuration as long as there are"

                  " instances using remote_raid1 disk template")

    # Build content of new known_hosts file

    cluster_name = ReadFile(SsconfName('cluster_name')).rstrip()

    cluster_key = cluster['rsahostkeypub']

    known_hosts = "%s ssh-rsa %s\n" % (cluster_name, cluster_key)

    Cluster12To20(cluster)

    # Add node attributes

    logging.info("Upgrading nodes")

    # stable-sort the names to have repeatable runs

    for node_name in utils.NiceSort(config_data['nodes'].keys()):

      Node12To20(config_data['nodes'][node_name])

    # Instance changes

    logging.info("Upgrading instances")

    drbd_minors = dict.fromkeys(config_data['nodes'], 0)

    secrets = set()

    # stable-sort the names to have repeatable runs

    for instance_name in utils.NiceSort(config_data['instances'].keys()):

      Instance12To20(drbd_minors, secrets, cluster['default_hypervisor'],

                     config_data['instances'][instance_name])

  else:

    logging.info("Found a Ganeti 2.0 configuration")

    if "config_version" in config_data["cluster"]:

      raise Error("Inconsistent configuration: found config_data in"

                  " configuration file")

    known_hosts = None

  try:

    logging.info("Writing configuration file")

    WriteFile(options.CONFIG_DATA_PATH, serializer.DumpJson(config_data))

    if known_hosts is not None:

      logging.info("Writing SSH known_hosts file (%s)", known_hosts.strip())

      WriteFile(options.KNOWN_HOSTS_PATH, known_hosts)

    if not options.dry_run:

      if not os.path.exists(options.RAPI_CERT_FILE):

        logging.debug("Writing RAPI certificate to %s", options.RAPI_CERT_FILE)

        utils.GenerateSelfSignedSslCert(options.RAPI_CERT_FILE)

  except:

    logging.critical("Writing configuration failed. It is probably in an"

                     " inconsistent state and needs manual intervention.")

    raise

  logging.info("Configuration file updated.")

if __name__ == "__main__":

  main()