mcpu.py 13.9 KB
Newer Older
Iustin Pop's avatar
Iustin Pop committed
1
#
Iustin Pop's avatar
Iustin Pop committed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
#

# 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.


"""Module implementing the logic behind the cluster operations

This module implements the logic for doing operations in the cluster. There
are two kinds of classes defined:
  - logical units, which know how to deal with their specific opcode only
  - the processor, which dispatches the opcodes to their logical units

"""

31
import logging
Iustin Pop's avatar
Iustin Pop committed
32
33
34
35
36
37

from ganeti import opcodes
from ganeti import constants
from ganeti import errors
from ganeti import rpc
from ganeti import cmdlib
38
from ganeti import locking
Iustin Pop's avatar
Iustin Pop committed
39

40

Iustin Pop's avatar
Iustin Pop committed
41
42
43
44
class Processor(object):
  """Object which runs OpCodes"""
  DISPATCH_TABLE = {
    # Cluster
45
    opcodes.OpPostInitCluster: cmdlib.LUPostInitCluster,
Iustin Pop's avatar
Iustin Pop committed
46
47
48
    opcodes.OpDestroyCluster: cmdlib.LUDestroyCluster,
    opcodes.OpQueryClusterInfo: cmdlib.LUQueryClusterInfo,
    opcodes.OpVerifyCluster: cmdlib.LUVerifyCluster,
49
    opcodes.OpQueryConfigValues: cmdlib.LUQueryConfigValues,
50
    opcodes.OpRenameCluster: cmdlib.LURenameCluster,
51
    opcodes.OpVerifyDisks: cmdlib.LUVerifyDisks,
52
    opcodes.OpSetClusterParams: cmdlib.LUSetClusterParams,
53
    opcodes.OpRedistributeConfig: cmdlib.LURedistributeConfig,
54
    opcodes.OpRepairDiskSizes: cmdlib.LURepairDiskSizes,
Iustin Pop's avatar
Iustin Pop committed
55
56
57
    # node lu
    opcodes.OpAddNode: cmdlib.LUAddNode,
    opcodes.OpQueryNodes: cmdlib.LUQueryNodes,
58
    opcodes.OpQueryNodeVolumes: cmdlib.LUQueryNodeVolumes,
59
    opcodes.OpQueryNodeStorage: cmdlib.LUQueryNodeStorage,
60
    opcodes.OpModifyNodeStorage: cmdlib.LUModifyNodeStorage,
Iustin Pop's avatar
Iustin Pop committed
61
    opcodes.OpRemoveNode: cmdlib.LURemoveNode,
Iustin Pop's avatar
Iustin Pop committed
62
    opcodes.OpSetNodeParams: cmdlib.LUSetNodeParams,
Iustin Pop's avatar
Iustin Pop committed
63
    opcodes.OpPowercycleNode: cmdlib.LUPowercycleNode,
64
    opcodes.OpEvacuateNode: cmdlib.LUEvacuateNode,
65
    opcodes.OpMigrateNode: cmdlib.LUMigrateNode,
Iustin Pop's avatar
Iustin Pop committed
66
67
    # instance lu
    opcodes.OpCreateInstance: cmdlib.LUCreateInstance,
68
    opcodes.OpReinstallInstance: cmdlib.LUReinstallInstance,
Iustin Pop's avatar
Iustin Pop committed
69
    opcodes.OpRemoveInstance: cmdlib.LURemoveInstance,
70
    opcodes.OpRenameInstance: cmdlib.LURenameInstance,
Iustin Pop's avatar
Iustin Pop committed
71
72
73
    opcodes.OpActivateInstanceDisks: cmdlib.LUActivateInstanceDisks,
    opcodes.OpShutdownInstance: cmdlib.LUShutdownInstance,
    opcodes.OpStartupInstance: cmdlib.LUStartupInstance,
74
    opcodes.OpRebootInstance: cmdlib.LURebootInstance,
Iustin Pop's avatar
Iustin Pop committed
75
76
    opcodes.OpDeactivateInstanceDisks: cmdlib.LUDeactivateInstanceDisks,
    opcodes.OpReplaceDisks: cmdlib.LUReplaceDisks,
Iustin Pop's avatar
Iustin Pop committed
77
    opcodes.OpRecreateInstanceDisks: cmdlib.LURecreateInstanceDisks,
Iustin Pop's avatar
Iustin Pop committed
78
    opcodes.OpFailoverInstance: cmdlib.LUFailoverInstance,
79
    opcodes.OpMigrateInstance: cmdlib.LUMigrateInstance,
Iustin Pop's avatar
Iustin Pop committed
80
81
82
    opcodes.OpConnectConsole: cmdlib.LUConnectConsole,
    opcodes.OpQueryInstances: cmdlib.LUQueryInstances,
    opcodes.OpQueryInstanceData: cmdlib.LUQueryInstanceData,
83
    opcodes.OpSetInstanceParams: cmdlib.LUSetInstanceParams,
Iustin Pop's avatar
Iustin Pop committed
84
    opcodes.OpGrowDisk: cmdlib.LUGrowDisk,
Iustin Pop's avatar
Iustin Pop committed
85
86
87
88
89
    # os lu
    opcodes.OpDiagnoseOS: cmdlib.LUDiagnoseOS,
    # exports lu
    opcodes.OpQueryExports: cmdlib.LUQueryExports,
    opcodes.OpExportInstance: cmdlib.LUExportInstance,
90
    opcodes.OpRemoveExport: cmdlib.LURemoveExport,
91
92
    # tags lu
    opcodes.OpGetTags: cmdlib.LUGetTags,
Iustin Pop's avatar
Iustin Pop committed
93
    opcodes.OpSearchTags: cmdlib.LUSearchTags,
94
95
    opcodes.OpAddTags: cmdlib.LUAddTags,
    opcodes.OpDelTags: cmdlib.LUDelTags,
96
97
    # test lu
    opcodes.OpTestDelay: cmdlib.LUTestDelay,
98
    opcodes.OpTestAllocator: cmdlib.LUTestAllocator,
Iustin Pop's avatar
Iustin Pop committed
99
100
    }

101
  def __init__(self, context):
Iustin Pop's avatar
Iustin Pop committed
102
103
    """Constructor for Processor

104
105
106
    Args:
     - feedback_fn: the feedback function (taking one string) to be run when
                    interesting events are happening
Iustin Pop's avatar
Iustin Pop committed
107
    """
108
    self.context = context
109
    self._feedback_fn = None
110
    self.exclusive_BGL = False
Iustin Pop's avatar
Iustin Pop committed
111
    self.rpc = rpc.RpcRunner(context.cfg)
Iustin Pop's avatar
Iustin Pop committed
112

113
114
115
116
117
118
  def _ExecLU(self, lu):
    """Logical Unit execution sequence.

    """
    write_count = self.context.cfg.write_count
    lu.CheckPrereq()
Iustin Pop's avatar
Iustin Pop committed
119
    hm = HooksMaster(self.rpc.call_hooks_runner, self, lu)
120
121
122
    h_results = hm.RunPhase(constants.HOOKS_PHASE_PRE)
    lu.HooksCallBack(constants.HOOKS_PHASE_PRE, h_results,
                     self._feedback_fn, None)
123
124
125
126
127
128
129
130
131

    if getattr(lu.op, "dry_run", False):
      # in this mode, no post-hooks are run, and the config is not
      # written (as it might have been modified by another LU, and we
      # shouldn't do writeout on behalf of other threads
      self.LogInfo("dry-run mode requested, not actually executing"
                   " the operation")
      return lu.dry_run_result

132
133
134
135
136
137
138
139
140
141
142
143
    try:
      result = lu.Exec(self._feedback_fn)
      h_results = hm.RunPhase(constants.HOOKS_PHASE_POST)
      result = lu.HooksCallBack(constants.HOOKS_PHASE_POST, h_results,
                                self._feedback_fn, result)
    finally:
      # FIXME: This needs locks if not lu_class.REQ_BGL
      if write_count != self.context.cfg.write_count:
        hm.RunConfigUpdate()

    return result

144
145
146
147
148
149
150
151
  def _LockAndExecLU(self, lu, level):
    """Execute a Logical Unit, with the needed locks.

    This is a recursive function that starts locking the given level, and
    proceeds up, till there are no more locks to acquire. Then it executes the
    given LU and its opcodes.

    """
152
153
    adding_locks = level in lu.add_locks
    acquiring_locks = level in lu.needed_locks
154
    if level not in locking.LEVELS:
Iustin Pop's avatar
Iustin Pop committed
155
156
      if callable(self._run_notifier):
        self._run_notifier()
157
      result = self._ExecLU(lu)
158
159
160
161
162
163
    elif adding_locks and acquiring_locks:
      # We could both acquire and add locks at the same level, but for now we
      # don't need this, so we'll avoid the complicated code needed.
      raise NotImplementedError(
        "Can't declare locks to acquire when adding others")
    elif adding_locks or acquiring_locks:
Guido Trotter's avatar
Guido Trotter committed
164
      lu.DeclareLocks(level)
Guido Trotter's avatar
Guido Trotter committed
165
      share = lu.share_locks[level]
166
167
168
169
170
171
172
173
174
175
176
177
      if acquiring_locks:
        needed_locks = lu.needed_locks[level]
        lu.acquired_locks[level] = self.context.glm.acquire(level,
                                                            needed_locks,
                                                            shared=share)
      else: # adding_locks
        add_locks = lu.add_locks[level]
        lu.remove_locks[level] = add_locks
        try:
          self.context.glm.add(level, add_locks, acquired=1, shared=share)
        except errors.LockError:
          raise errors.OpPrereqError(
Michael Hanselmann's avatar
Michael Hanselmann committed
178
            "Couldn't add locks (%s), probably because of a race condition"
179
            " with another job, who added them first" % add_locks)
180
      try:
181
182
183
184
185
186
187
        try:
          if adding_locks:
            lu.acquired_locks[level] = add_locks
          result = self._LockAndExecLU(lu, level + 1)
        finally:
          if level in lu.remove_locks:
            self.context.glm.remove(level, lu.remove_locks[level])
188
      finally:
189
        if self.context.glm.is_owned(level):
190
191
          self.context.glm.release(level)
    else:
192
      result = self._LockAndExecLU(lu, level + 1)
193
194
195

    return result

Iustin Pop's avatar
Iustin Pop committed
196
  def ExecOpCode(self, op, feedback_fn, run_notifier):
Iustin Pop's avatar
Iustin Pop committed
197
198
    """Execute an opcode.

Iustin Pop's avatar
Iustin Pop committed
199
200
201
202
203
204
205
206
    @type op: an OpCode instance
    @param op: the opcode to be executed
    @type feedback_fn: a function that takes a single argument
    @param feedback_fn: this function will be used as feedback from the LU
                        code to the end-user
    @type run_notifier: callable (no arguments) or None
    @param run_notifier:  this function (if callable) will be called when
                          we are about to call the lu's Exec() method, that
Michael Hanselmann's avatar
Michael Hanselmann committed
207
                          is, after we have acquired all locks
Iustin Pop's avatar
Iustin Pop committed
208
209
210

    """
    if not isinstance(op, opcodes.OpCode):
211
212
      raise errors.ProgrammerError("Non-opcode instance passed"
                                   " to ExecOpcode")
Iustin Pop's avatar
Iustin Pop committed
213

214
    self._feedback_fn = feedback_fn
Iustin Pop's avatar
Iustin Pop committed
215
    self._run_notifier = run_notifier
Iustin Pop's avatar
Iustin Pop committed
216
217
    lu_class = self.DISPATCH_TABLE.get(op.__class__, None)
    if lu_class is None:
218
      raise errors.OpCodeUnknown("Unknown opcode")
Iustin Pop's avatar
Iustin Pop committed
219

220
221
    # Acquire the Big Ganeti Lock exclusively if this LU requires it, and in a
    # shared fashion otherwise (to prevent concurrent run with an exclusive LU.
Guido Trotter's avatar
Guido Trotter committed
222
    self.context.glm.acquire(locking.LEVEL_CLUSTER, [locking.BGL],
223
                             shared=not lu_class.REQ_BGL)
224
    try:
225
      self.exclusive_BGL = lu_class.REQ_BGL
Iustin Pop's avatar
Iustin Pop committed
226
      lu = lu_class(self, op, self.context, self.rpc)
227
      lu.ExpandNames()
228
      assert lu.needed_locks is not None, "needed_locks not set by LU"
229
      result = self._LockAndExecLU(lu, locking.LEVEL_INSTANCE)
230
    finally:
Guido Trotter's avatar
Guido Trotter committed
231
      self.context.glm.release(locking.LEVEL_CLUSTER)
232
      self.exclusive_BGL = False
233

Iustin Pop's avatar
Iustin Pop committed
234
235
    return result

236
237
238
239
  def LogStep(self, current, total, message):
    """Log a change in LU execution progress.

    """
240
    logging.debug("Step %d/%d %s", current, total, message)
241
242
    self._feedback_fn("STEP %d/%d %s" % (current, total, message))

243
  def LogWarning(self, message, *args, **kwargs):
244
245
    """Log a warning to the logs and the user.

246
247
248
249
    The optional keyword argument is 'hint' and can be used to show a
    hint to the user (presumably related to the warning). If the
    message is empty, it will not be printed at all, allowing one to
    show only a hint.
250

251
252
253
254
255
256
257
258
259
260
261
262
    """
    assert not kwargs or (len(kwargs) == 1 and "hint" in kwargs), \
           "Invalid keyword arguments for LogWarning (%s)" % str(kwargs)
    if args:
      message = message % tuple(args)
    if message:
      logging.warning(message)
      self._feedback_fn(" - WARNING: %s" % message)
    if "hint" in kwargs:
      self._feedback_fn("      Hint: %s" % kwargs["hint"])

  def LogInfo(self, message, *args):
263
264
265
    """Log an informational message to the logs and the user.

    """
266
267
    if args:
      message = message % tuple(args)
268
    logging.info(message)
269
270
    self._feedback_fn(" - INFO: %s" % message)

Iustin Pop's avatar
Iustin Pop committed
271
272
273
274
275
276
277
278
279
280
281
282
283

class HooksMaster(object):
  """Hooks master.

  This class distributes the run commands to the nodes based on the
  specific LU class.

  In order to remove the direct dependency on the rpc module, the
  constructor needs a function which actually does the remote
  call. This will usually be rpc.call_hooks_runner, but any function
  which behaves the same works.

  """
284
  def __init__(self, callfn, proc, lu):
Iustin Pop's avatar
Iustin Pop committed
285
    self.callfn = callfn
286
    self.proc = proc
Iustin Pop's avatar
Iustin Pop committed
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
    self.lu = lu
    self.op = lu.op
    self.env, node_list_pre, node_list_post = self._BuildEnv()
    self.node_list = {constants.HOOKS_PHASE_PRE: node_list_pre,
                      constants.HOOKS_PHASE_POST: node_list_post}

  def _BuildEnv(self):
    """Compute the environment and the target nodes.

    Based on the opcode and the current node list, this builds the
    environment for the hooks and the target node list for the run.

    """
    env = {
      "PATH": "/sbin:/bin:/usr/sbin:/usr/bin",
      "GANETI_HOOKS_VERSION": constants.HOOKS_VERSION,
      "GANETI_OP_CODE": self.op.OP_ID,
      "GANETI_OBJECT_TYPE": self.lu.HTYPE,
305
      "GANETI_DATA_DIR": constants.DATA_DIR,
Iustin Pop's avatar
Iustin Pop committed
306
307
      }

308
309
310
311
312
313
314
    if self.lu.HPATH is not None:
      lu_env, lu_nodes_pre, lu_nodes_post = self.lu.BuildHooksEnv()
      if lu_env:
        for key in lu_env:
          env["GANETI_" + key] = lu_env[key]
    else:
      lu_nodes_pre = lu_nodes_post = []
Iustin Pop's avatar
Iustin Pop committed
315

316
317
318
319
320
321
322
323
324
325
326
    return env, frozenset(lu_nodes_pre), frozenset(lu_nodes_post)

  def _RunWrapper(self, node_list, hpath, phase):
    """Simple wrapper over self.callfn.

    This method fixes the environment before doing the rpc call.

    """
    env = self.env.copy()
    env["GANETI_HOOKS_PHASE"] = phase
    env["GANETI_HOOKS_PATH"] = hpath
Michael Hanselmann's avatar
Michael Hanselmann committed
327
328
329
    if self.lu.cfg is not None:
      env["GANETI_CLUSTER"] = self.lu.cfg.GetClusterName()
      env["GANETI_MASTER"] = self.lu.cfg.GetMasterNode()
Iustin Pop's avatar
Iustin Pop committed
330

331
    env = dict([(str(key), str(val)) for key, val in env.iteritems()])
Iustin Pop's avatar
Iustin Pop committed
332

333
    return self.callfn(node_list, hpath, phase, env)
Iustin Pop's avatar
Iustin Pop committed
334
335
336
337
338
339

  def RunPhase(self, phase):
    """Run all the scripts for a phase.

    This is the main function of the HookMaster.

Iustin Pop's avatar
Iustin Pop committed
340
341
342
343
    @param phase: one of L{constants.HOOKS_PHASE_POST} or
        L{constants.HOOKS_PHASE_PRE}; it denotes the hooks phase
    @return: the processed results of the hooks multi-node rpc call
    @raise errors.HooksFailure: on communication failure to the nodes
344

Iustin Pop's avatar
Iustin Pop committed
345
346
    """
    if not self.node_list[phase]:
347
348
349
      # empty node list, we should not attempt to run this as either
      # we're in the cluster init phase and the rpc client part can't
      # even attempt to run, or this LU doesn't do hooks at all
Iustin Pop's avatar
Iustin Pop committed
350
      return
351
352
    hpath = self.lu.HPATH
    results = self._RunWrapper(self.node_list[phase], hpath, phase)
Iustin Pop's avatar
Iustin Pop committed
353
354
355
    if phase == constants.HOOKS_PHASE_PRE:
      errs = []
      if not results:
356
        raise errors.HooksFailure("Communication failure")
Iustin Pop's avatar
Iustin Pop committed
357
358
      for node_name in results:
        res = results[node_name]
359
        if res.offline:
360
          continue
361
362
363
364
365
366
        msg = res.RemoteFailMsg()
        if msg:
          self.proc.LogWarning("Communication failure to node %s: %s",
                               node_name, msg)
          continue
        for script, hkr, output in res.payload:
Iustin Pop's avatar
Iustin Pop committed
367
368
369
          if hkr == constants.HKR_FAIL:
            errs.append((node_name, script, output))
      if errs:
370
        raise errors.HooksAbort(errs)
371
    return results
372
373
374
375
376
377
378
379
380
381

  def RunConfigUpdate(self):
    """Run the special configuration update hook

    This is a special hook that runs only on the master after each
    top-level LI if the configuration has been updated.

    """
    phase = constants.HOOKS_PHASE_POST
    hpath = constants.HOOKS_NAME_CFGUPDATE
Michael Hanselmann's avatar
Michael Hanselmann committed
382
    nodes = [self.lu.cfg.GetMasterNode()]
Iustin Pop's avatar
Iustin Pop committed
383
    self._RunWrapper(nodes, hpath, phase)