4 # Copyright (C) 2006, 2007 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 """Module implementing the logic behind the cluster operations
24 This module implements the logic for doing operations in the cluster. There
25 are two kinds of classes defined:
26 - logical units, which know how to deal with their specific opcode only
27 - the processor, which dispatches the opcodes to their logical units
32 from ganeti import opcodes
33 from ganeti import constants
34 from ganeti import errors
35 from ganeti import rpc
36 from ganeti import cmdlib
37 from ganeti import logger
38 from ganeti import locking
41 class Processor(object):
42 """Object which runs OpCodes"""
45 opcodes.OpDestroyCluster: cmdlib.LUDestroyCluster,
46 opcodes.OpQueryClusterInfo: cmdlib.LUQueryClusterInfo,
47 opcodes.OpVerifyCluster: cmdlib.LUVerifyCluster,
48 opcodes.OpQueryConfigValues: cmdlib.LUQueryConfigValues,
49 opcodes.OpRenameCluster: cmdlib.LURenameCluster,
50 opcodes.OpVerifyDisks: cmdlib.LUVerifyDisks,
51 opcodes.OpSetClusterParams: cmdlib.LUSetClusterParams,
53 opcodes.OpAddNode: cmdlib.LUAddNode,
54 opcodes.OpQueryNodes: cmdlib.LUQueryNodes,
55 opcodes.OpQueryNodeVolumes: cmdlib.LUQueryNodeVolumes,
56 opcodes.OpRemoveNode: cmdlib.LURemoveNode,
58 opcodes.OpCreateInstance: cmdlib.LUCreateInstance,
59 opcodes.OpReinstallInstance: cmdlib.LUReinstallInstance,
60 opcodes.OpRemoveInstance: cmdlib.LURemoveInstance,
61 opcodes.OpRenameInstance: cmdlib.LURenameInstance,
62 opcodes.OpActivateInstanceDisks: cmdlib.LUActivateInstanceDisks,
63 opcodes.OpShutdownInstance: cmdlib.LUShutdownInstance,
64 opcodes.OpStartupInstance: cmdlib.LUStartupInstance,
65 opcodes.OpRebootInstance: cmdlib.LURebootInstance,
66 opcodes.OpDeactivateInstanceDisks: cmdlib.LUDeactivateInstanceDisks,
67 opcodes.OpReplaceDisks: cmdlib.LUReplaceDisks,
68 opcodes.OpFailoverInstance: cmdlib.LUFailoverInstance,
69 opcodes.OpConnectConsole: cmdlib.LUConnectConsole,
70 opcodes.OpQueryInstances: cmdlib.LUQueryInstances,
71 opcodes.OpQueryInstanceData: cmdlib.LUQueryInstanceData,
72 opcodes.OpSetInstanceParams: cmdlib.LUSetInstanceParams,
73 opcodes.OpGrowDisk: cmdlib.LUGrowDisk,
75 opcodes.OpDiagnoseOS: cmdlib.LUDiagnoseOS,
77 opcodes.OpQueryExports: cmdlib.LUQueryExports,
78 opcodes.OpExportInstance: cmdlib.LUExportInstance,
79 opcodes.OpRemoveExport: cmdlib.LURemoveExport,
81 opcodes.OpGetTags: cmdlib.LUGetTags,
82 opcodes.OpSearchTags: cmdlib.LUSearchTags,
83 opcodes.OpAddTags: cmdlib.LUAddTags,
84 opcodes.OpDelTags: cmdlib.LUDelTags,
86 opcodes.OpTestDelay: cmdlib.LUTestDelay,
87 opcodes.OpTestAllocator: cmdlib.LUTestAllocator,
90 def __init__(self, context):
91 """Constructor for Processor
94 - feedback_fn: the feedback function (taking one string) to be run when
95 interesting events are happening
97 self.context = context
98 self._feedback_fn = None
99 self.exclusive_BGL = False
101 def _ExecLU(self, lu):
102 """Logical Unit execution sequence.
105 write_count = self.context.cfg.write_count
107 hm = HooksMaster(rpc.call_hooks_runner, self, lu)
108 h_results = hm.RunPhase(constants.HOOKS_PHASE_PRE)
109 lu.HooksCallBack(constants.HOOKS_PHASE_PRE, h_results,
110 self._feedback_fn, None)
112 result = lu.Exec(self._feedback_fn)
113 h_results = hm.RunPhase(constants.HOOKS_PHASE_POST)
114 result = lu.HooksCallBack(constants.HOOKS_PHASE_POST, h_results,
115 self._feedback_fn, result)
117 # FIXME: This needs locks if not lu_class.REQ_BGL
118 if write_count != self.context.cfg.write_count:
123 def _LockAndExecLU(self, lu, level):
124 """Execute a Logical Unit, with the needed locks.
126 This is a recursive function that starts locking the given level, and
127 proceeds up, till there are no more locks to acquire. Then it executes the
128 given LU and its opcodes.
131 adding_locks = level in lu.add_locks
132 acquiring_locks = level in lu.needed_locks
133 if level not in locking.LEVELS:
134 if callable(self._run_notifier):
136 result = self._ExecLU(lu)
137 elif adding_locks and acquiring_locks:
138 # We could both acquire and add locks at the same level, but for now we
139 # don't need this, so we'll avoid the complicated code needed.
140 raise NotImplementedError(
141 "Can't declare locks to acquire when adding others")
142 elif adding_locks or acquiring_locks:
143 lu.DeclareLocks(level)
144 share = lu.share_locks[level]
146 needed_locks = lu.needed_locks[level]
147 lu.acquired_locks[level] = self.context.glm.acquire(level,
151 add_locks = lu.add_locks[level]
152 lu.remove_locks[level] = add_locks
154 self.context.glm.add(level, add_locks, acquired=1, shared=share)
155 except errors.LockError:
156 raise errors.OpPrereqError(
157 "Coudn't add locks (%s), probably because of a race condition"
158 " with another job, who added them first" % add_locks)
162 lu.acquired_locks[level] = add_locks
163 result = self._LockAndExecLU(lu, level + 1)
165 if level in lu.remove_locks:
166 self.context.glm.remove(level, lu.remove_locks[level])
168 if self.context.glm.is_owned(level):
169 self.context.glm.release(level)
171 result = self._LockAndExecLU(lu, level + 1)
175 def ExecOpCode(self, op, feedback_fn, run_notifier):
176 """Execute an opcode.
178 @type op: an OpCode instance
179 @param op: the opcode to be executed
180 @type feedback_fn: a function that takes a single argument
181 @param feedback_fn: this function will be used as feedback from the LU
183 @type run_notifier: callable (no arguments) or None
184 @param run_notifier: this function (if callable) will be called when
185 we are about to call the lu's Exec() method, that
186 is, after we have aquired all locks
189 if not isinstance(op, opcodes.OpCode):
190 raise errors.ProgrammerError("Non-opcode instance passed"
193 self._feedback_fn = feedback_fn
194 self._run_notifier = run_notifier
195 lu_class = self.DISPATCH_TABLE.get(op.__class__, None)
197 raise errors.OpCodeUnknown("Unknown opcode")
199 # Acquire the Big Ganeti Lock exclusively if this LU requires it, and in a
200 # shared fashion otherwise (to prevent concurrent run with an exclusive LU.
201 self.context.glm.acquire(locking.LEVEL_CLUSTER, [locking.BGL],
202 shared=not lu_class.REQ_BGL)
204 self.exclusive_BGL = lu_class.REQ_BGL
205 lu = lu_class(self, op, self.context)
207 assert lu.needed_locks is not None, "needed_locks not set by LU"
208 result = self._LockAndExecLU(lu, locking.LEVEL_INSTANCE)
210 self.context.glm.release(locking.LEVEL_CLUSTER)
211 self.exclusive_BGL = False
215 def LogStep(self, current, total, message):
216 """Log a change in LU execution progress.
219 logger.Debug("Step %d/%d %s" % (current, total, message))
220 self._feedback_fn("STEP %d/%d %s" % (current, total, message))
222 def LogWarning(self, message, hint=None):
223 """Log a warning to the logs and the user.
226 logger.Error(message)
227 self._feedback_fn(" - WARNING: %s" % message)
229 self._feedback_fn(" Hint: %s" % hint)
231 def LogInfo(self, message):
232 """Log an informational message to the logs and the user.
236 self._feedback_fn(" - INFO: %s" % message)
239 class HooksMaster(object):
242 This class distributes the run commands to the nodes based on the
245 In order to remove the direct dependency on the rpc module, the
246 constructor needs a function which actually does the remote
247 call. This will usually be rpc.call_hooks_runner, but any function
248 which behaves the same works.
251 def __init__(self, callfn, proc, lu):
256 self.env, node_list_pre, node_list_post = self._BuildEnv()
257 self.node_list = {constants.HOOKS_PHASE_PRE: node_list_pre,
258 constants.HOOKS_PHASE_POST: node_list_post}
261 """Compute the environment and the target nodes.
263 Based on the opcode and the current node list, this builds the
264 environment for the hooks and the target node list for the run.
268 "PATH": "/sbin:/bin:/usr/sbin:/usr/bin",
269 "GANETI_HOOKS_VERSION": constants.HOOKS_VERSION,
270 "GANETI_OP_CODE": self.op.OP_ID,
271 "GANETI_OBJECT_TYPE": self.lu.HTYPE,
272 "GANETI_DATA_DIR": constants.DATA_DIR,
275 if self.lu.HPATH is not None:
276 lu_env, lu_nodes_pre, lu_nodes_post = self.lu.BuildHooksEnv()
279 env["GANETI_" + key] = lu_env[key]
281 lu_nodes_pre = lu_nodes_post = []
283 return env, frozenset(lu_nodes_pre), frozenset(lu_nodes_post)
285 def _RunWrapper(self, node_list, hpath, phase):
286 """Simple wrapper over self.callfn.
288 This method fixes the environment before doing the rpc call.
291 env = self.env.copy()
292 env["GANETI_HOOKS_PHASE"] = phase
293 env["GANETI_HOOKS_PATH"] = hpath
294 if self.lu.cfg is not None:
295 env["GANETI_CLUSTER"] = self.lu.cfg.GetClusterName()
296 env["GANETI_MASTER"] = self.lu.cfg.GetMasterNode()
298 env = dict([(str(key), str(val)) for key, val in env.iteritems()])
300 return self.callfn(node_list, hpath, phase, env)
302 def RunPhase(self, phase):
303 """Run all the scripts for a phase.
305 This is the main function of the HookMaster.
308 phase: the hooks phase to run
311 the result of the hooks multi-node rpc call
314 if not self.node_list[phase]:
315 # empty node list, we should not attempt to run this as either
316 # we're in the cluster init phase and the rpc client part can't
317 # even attempt to run, or this LU doesn't do hooks at all
319 hpath = self.lu.HPATH
320 results = self._RunWrapper(self.node_list[phase], hpath, phase)
321 if phase == constants.HOOKS_PHASE_PRE:
324 raise errors.HooksFailure("Communication failure")
325 for node_name in results:
326 res = results[node_name]
327 if res is False or not isinstance(res, list):
328 self.proc.LogWarning("Communication failure to node %s" % node_name)
330 for script, hkr, output in res:
331 if hkr == constants.HKR_FAIL:
332 output = output.strip().encode("string_escape")
333 errs.append((node_name, script, output))
335 raise errors.HooksAbort(errs)
338 def RunConfigUpdate(self):
339 """Run the special configuration update hook
341 This is a special hook that runs only on the master after each
342 top-level LI if the configuration has been updated.
345 phase = constants.HOOKS_PHASE_POST
346 hpath = constants.HOOKS_NAME_CFGUPDATE
347 nodes = [self.lu.cfg.GetMasterNode()]
348 results = self._RunWrapper(nodes, hpath, phase)