Synnefo » snf-ganeti » ganeti-local

# --with-iallocator-search-path=...

# do a bit of black sed magic to for quoting of the strings in the list

AC_ARG_WITH([iallocator-search-path],

  [AS_HELP_STRING([--with-iallocator-search-path=LIST],

    [comma separated list of directories to]

    [ search for instance allocators (default is $libdir/ganeti/iallocators)]

  )],

  [iallocator_search_path=`echo -n "$withval" | sed -e "s/\([[^,]]*\)/'\1'/g"`],

  [iallocator_search_path="'$libdir/$PACKAGE_NAME/iallocators'"])

AC_SUBST(IALLOCATOR_SEARCH_PATH, $iallocator_search_path)

#!/usr/bin/python

#

# Copyright (C) 2008 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.

"""Simple first-fit allocator for ganeti instance allocation framework.

This allocator just iterates over the nodes and selects the first one

that fits in both memory and disk space, without any consideration for

equal spread or VCPU oversubscription.

"""

import simplejson

import sys

def SelectNode(nodes, request, to_skip):

  """Select a node for the given instance

  """

  disk_size = request["disk_space_total"]

  selected = None

  for nname, ninfo in nodes.iteritems():

    if nname in to_skip:

      continue

    if request["memory"] > ninfo["free_memory"]:

      continue

    if disk_size > ninfo["free_disk"]:

      continue

    selected = nname

    break

  return selected

def OutputError(text):

  """Builds an error response with a given info message.

  """

  error = {

    "success": False,

    "info": text,

    }

  print simplejson.dumps(error, indent=2)

  return 1

def main():

  """Main function.

  """

  if len(sys.argv) < 2:

    print >> sys.stderr, "Usage: %s cluster.json" % (sys.argv[0])

    return 1

  data = simplejson.load(open(sys.argv[1]))

  nodes =  data["nodes"]

  request = data["request"]

  req_type = request["type"]

  if req_type != "allocate":

    print >> sys.stderr, "Unsupported allocator mode '%s'" % req_type

    return 1

  npri = SelectNode(nodes, request, [])

  if npri is None:

    return OutputError("Can't find a suitable primary node")

  result_nodes = [npri]

  if request["disk_template"] == "drbd":

    nsec = SelectNode(nodes, request, result_nodes)

    if nsec is None:

      return OutputError("Can't find a suitable secondary node (%s selected"

                         " as primary)" % npri)

    result_nodes.append(nsec)

  result = {

          "success": True,

          "info": "Allocation successful",

          "nodes": result_nodes,

          }

  print simplejson.dumps(result, indent=2)

  return 0

if __name__ == "__main__":

    sys.exit(main())

	  echo "IALLOCATOR_SEARCH_PATH = [$(IALLOCATOR_SEARCH_PATH)]"; \

def _IAllocatorGetClusterData(cfg, sstore):

def _IAllocatorAddNewInstance(data, op):

  if len(op.disks) != 2:

    raise errors.OpExecError("Only two-disk configurations supported")

  disk_space = _ComputeDiskSize(op.disk_template,

                                op.disks[0]["size"], op.disks[1]["size"])

    "disk_space_total": disk_space,

def _IAllocatorAddRelocateInstance(data, op):

  This in combination with _IAllocatorGetClusterData will create the

def _IAllocatorRun(name, data):

  """Run an instance allocator and return the results.

  """

  alloc_script = utils.FindFile(name, constants.IALLOCATOR_SEARCH_PATH,

                                os.path.isfile)

  if alloc_script is None:

    raise errors.OpExecError("Can't find allocator")

  fd, fin_name = tempfile.mkstemp(prefix="ganeti-iallocator.")

  try:

    os.write(fd, data)

    os.close(fd)

    result = utils.RunCmd([alloc_script, fin_name])

    if result.failed:

      raise errors.OpExecError("Instance allocator call failed: %s,"

                               " output: %s" %

                               (result.fail_reason, result.stdout))

  finally:

    os.unlink(fin_name)

  return result.stdout

    if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:

      if len(self.op.disks) != 2:

        raise errors.OpPrereqError("Only two-disk configurations supported")

    elif self.op.mode == constants.IALLOCATOR_MODE_RELOC:

    if self.op.direction == constants.IALLOCATOR_DIR_OUT:

      if not hasattr(self.op, "allocator") or self.op.allocator is None:

    elif self.op.direction != constants.IALLOCATOR_DIR_IN:

    data = _IAllocatorGetClusterData(self.cfg, self.sstore)

    if self.op.mode == constants.IALLOCATOR_MODE_ALLOC:

      _IAllocatorAddNewInstance(data, self.op)

      _IAllocatorAddRelocateInstance(data, self.op)

    if self.op.direction == constants.IALLOCATOR_DIR_IN:

      result = text

    else:

      result = _IAllocatorRun(self.op.allocator, text)

    return result

IALLOCATOR_DIR_IN = "in"

IALLOCATOR_DIR_OUT = "out"

IALLOCATOR_MODE_ALLOC = "allocate"

IALLOCATOR_MODE_RELOC = "relocate"

IALLOCATOR_SEARCH_PATH = _autoconf.IALLOCATOR_SEARCH_PATH