root / lib / config.py @ ee513a66
History | View | Annotate | Download (33.6 kB)
1 |
#
|
---|---|
2 |
#
|
3 |
|
4 |
# Copyright (C) 2006, 2007 Google Inc.
|
5 |
#
|
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.
|
10 |
#
|
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.
|
15 |
#
|
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
|
19 |
# 02110-1301, USA.
|
20 |
|
21 |
|
22 |
"""Configuration management for Ganeti
|
23 |
|
24 |
This module provides the interface to the Ganeti cluster configuration.
|
25 |
|
26 |
The configuration data is stored on every node but is updated on the master
|
27 |
only. After each update, the master distributes the data to the other nodes.
|
28 |
|
29 |
Currently, the data storage format is JSON. YAML was slow and consuming too
|
30 |
much memory.
|
31 |
|
32 |
"""
|
33 |
|
34 |
import os |
35 |
import tempfile |
36 |
import random |
37 |
import logging |
38 |
|
39 |
from ganeti import errors |
40 |
from ganeti import locking |
41 |
from ganeti import utils |
42 |
from ganeti import constants |
43 |
from ganeti import rpc |
44 |
from ganeti import objects |
45 |
from ganeti import serializer |
46 |
|
47 |
|
48 |
_config_lock = locking.SharedLock() |
49 |
|
50 |
|
51 |
def _ValidateConfig(data): |
52 |
if data.version != constants.CONFIG_VERSION:
|
53 |
raise errors.ConfigurationError("Cluster configuration version" |
54 |
" mismatch, got %s instead of %s" %
|
55 |
(data.version, |
56 |
constants.CONFIG_VERSION)) |
57 |
|
58 |
|
59 |
class ConfigWriter: |
60 |
"""The interface to the cluster configuration.
|
61 |
|
62 |
"""
|
63 |
def __init__(self, cfg_file=None, offline=False): |
64 |
self.write_count = 0 |
65 |
self._lock = _config_lock
|
66 |
self._config_data = None |
67 |
self._offline = offline
|
68 |
if cfg_file is None: |
69 |
self._cfg_file = constants.CLUSTER_CONF_FILE
|
70 |
else:
|
71 |
self._cfg_file = cfg_file
|
72 |
self._temporary_ids = set() |
73 |
self._temporary_drbds = {}
|
74 |
# Note: in order to prevent errors when resolving our name in
|
75 |
# _DistributeConfig, we compute it here once and reuse it; it's
|
76 |
# better to raise an error before starting to modify the config
|
77 |
# file than after it was modified
|
78 |
self._my_hostname = utils.HostInfo().name
|
79 |
self._OpenConfig()
|
80 |
|
81 |
# this method needs to be static, so that we can call it on the class
|
82 |
@staticmethod
|
83 |
def IsCluster(): |
84 |
"""Check if the cluster is configured.
|
85 |
|
86 |
"""
|
87 |
return os.path.exists(constants.CLUSTER_CONF_FILE)
|
88 |
|
89 |
@locking.ssynchronized(_config_lock, shared=1) |
90 |
def GenerateMAC(self): |
91 |
"""Generate a MAC for an instance.
|
92 |
|
93 |
This should check the current instances for duplicates.
|
94 |
|
95 |
"""
|
96 |
prefix = self._config_data.cluster.mac_prefix
|
97 |
all_macs = self._AllMACs()
|
98 |
retries = 64
|
99 |
while retries > 0: |
100 |
byte1 = random.randrange(0, 256) |
101 |
byte2 = random.randrange(0, 256) |
102 |
byte3 = random.randrange(0, 256) |
103 |
mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
|
104 |
if mac not in all_macs: |
105 |
break
|
106 |
retries -= 1
|
107 |
else:
|
108 |
raise errors.ConfigurationError("Can't generate unique MAC") |
109 |
return mac
|
110 |
|
111 |
@locking.ssynchronized(_config_lock, shared=1) |
112 |
def IsMacInUse(self, mac): |
113 |
"""Predicate: check if the specified MAC is in use in the Ganeti cluster.
|
114 |
|
115 |
This only checks instances managed by this cluster, it does not
|
116 |
check for potential collisions elsewhere.
|
117 |
|
118 |
"""
|
119 |
all_macs = self._AllMACs()
|
120 |
return mac in all_macs |
121 |
|
122 |
@locking.ssynchronized(_config_lock, shared=1) |
123 |
def GenerateDRBDSecret(self): |
124 |
"""Generate a DRBD secret.
|
125 |
|
126 |
This checks the current disks for duplicates.
|
127 |
|
128 |
"""
|
129 |
all_secrets = self._AllDRBDSecrets()
|
130 |
retries = 64
|
131 |
while retries > 0: |
132 |
secret = utils.GenerateSecret() |
133 |
if secret not in all_secrets: |
134 |
break
|
135 |
retries -= 1
|
136 |
else:
|
137 |
raise errors.ConfigurationError("Can't generate unique DRBD secret") |
138 |
return secret
|
139 |
|
140 |
def _ComputeAllLVs(self): |
141 |
"""Compute the list of all LVs.
|
142 |
|
143 |
"""
|
144 |
lvnames = set()
|
145 |
for instance in self._config_data.instances.values(): |
146 |
node_data = instance.MapLVsByNode() |
147 |
for lv_list in node_data.values(): |
148 |
lvnames.update(lv_list) |
149 |
return lvnames
|
150 |
|
151 |
@locking.ssynchronized(_config_lock, shared=1) |
152 |
def GenerateUniqueID(self, exceptions=None): |
153 |
"""Generate an unique disk name.
|
154 |
|
155 |
This checks the current node, instances and disk names for
|
156 |
duplicates.
|
157 |
|
158 |
Args:
|
159 |
- exceptions: a list with some other names which should be checked
|
160 |
for uniqueness (used for example when you want to get
|
161 |
more than one id at one time without adding each one in
|
162 |
turn to the config file
|
163 |
|
164 |
Returns: the unique id as a string
|
165 |
|
166 |
"""
|
167 |
existing = set()
|
168 |
existing.update(self._temporary_ids)
|
169 |
existing.update(self._ComputeAllLVs())
|
170 |
existing.update(self._config_data.instances.keys())
|
171 |
existing.update(self._config_data.nodes.keys())
|
172 |
if exceptions is not None: |
173 |
existing.update(exceptions) |
174 |
retries = 64
|
175 |
while retries > 0: |
176 |
unique_id = utils.NewUUID() |
177 |
if unique_id not in existing and unique_id is not None: |
178 |
break
|
179 |
else:
|
180 |
raise errors.ConfigurationError("Not able generate an unique ID" |
181 |
" (last tried ID: %s" % unique_id)
|
182 |
self._temporary_ids.add(unique_id)
|
183 |
return unique_id
|
184 |
|
185 |
def _AllMACs(self): |
186 |
"""Return all MACs present in the config.
|
187 |
|
188 |
"""
|
189 |
result = [] |
190 |
for instance in self._config_data.instances.values(): |
191 |
for nic in instance.nics: |
192 |
result.append(nic.mac) |
193 |
|
194 |
return result
|
195 |
|
196 |
def _AllDRBDSecrets(self): |
197 |
"""Return all DRBD secrets present in the config.
|
198 |
|
199 |
"""
|
200 |
def helper(disk, result): |
201 |
"""Recursively gather secrets from this disk."""
|
202 |
if disk.dev_type == constants.DT_DRBD8:
|
203 |
result.append(disk.logical_id[5])
|
204 |
if disk.children:
|
205 |
for child in disk.children: |
206 |
helper(child, result) |
207 |
|
208 |
result = [] |
209 |
for instance in self._config_data.instances.values(): |
210 |
for disk in instance.disks: |
211 |
helper(disk, result) |
212 |
|
213 |
return result
|
214 |
|
215 |
@locking.ssynchronized(_config_lock, shared=1) |
216 |
def VerifyConfig(self): |
217 |
"""Verify function.
|
218 |
|
219 |
"""
|
220 |
result = [] |
221 |
seen_macs = [] |
222 |
ports = {} |
223 |
data = self._config_data
|
224 |
for instance_name in data.instances: |
225 |
instance = data.instances[instance_name] |
226 |
if instance.primary_node not in data.nodes: |
227 |
result.append("instance '%s' has invalid primary node '%s'" %
|
228 |
(instance_name, instance.primary_node)) |
229 |
for snode in instance.secondary_nodes: |
230 |
if snode not in data.nodes: |
231 |
result.append("instance '%s' has invalid secondary node '%s'" %
|
232 |
(instance_name, snode)) |
233 |
for idx, nic in enumerate(instance.nics): |
234 |
if nic.mac in seen_macs: |
235 |
result.append("instance '%s' has NIC %d mac %s duplicate" %
|
236 |
(instance_name, idx, nic.mac)) |
237 |
else:
|
238 |
seen_macs.append(nic.mac) |
239 |
|
240 |
# gather the drbd ports for duplicate checks
|
241 |
for dsk in instance.disks: |
242 |
if dsk.dev_type in constants.LDS_DRBD: |
243 |
tcp_port = dsk.logical_id[2]
|
244 |
if tcp_port not in ports: |
245 |
ports[tcp_port] = [] |
246 |
ports[tcp_port].append((instance.name, "drbd disk %s" % dsk.iv_name))
|
247 |
# gather network port reservation
|
248 |
net_port = getattr(instance, "network_port", None) |
249 |
if net_port is not None: |
250 |
if net_port not in ports: |
251 |
ports[net_port] = [] |
252 |
ports[net_port].append((instance.name, "network port"))
|
253 |
|
254 |
# cluster-wide pool of free ports
|
255 |
for free_port in data.cluster.tcpudp_port_pool: |
256 |
if free_port not in ports: |
257 |
ports[free_port] = [] |
258 |
ports[free_port].append(("cluster", "port marked as free")) |
259 |
|
260 |
# compute tcp/udp duplicate ports
|
261 |
keys = ports.keys() |
262 |
keys.sort() |
263 |
for pnum in keys: |
264 |
pdata = ports[pnum] |
265 |
if len(pdata) > 1: |
266 |
txt = ", ".join(["%s/%s" % val for val in pdata]) |
267 |
result.append("tcp/udp port %s has duplicates: %s" % (pnum, txt))
|
268 |
|
269 |
# highest used tcp port check
|
270 |
if keys:
|
271 |
if keys[-1] > data.cluster.highest_used_port: |
272 |
result.append("Highest used port mismatch, saved %s, computed %s" %
|
273 |
(data.cluster.highest_used_port, keys[-1]))
|
274 |
|
275 |
if not data.nodes[data.cluster.master_node].master_candidate: |
276 |
result.append("Master node is not a master candidate")
|
277 |
|
278 |
mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
|
279 |
if mc_now < mc_max:
|
280 |
result.append("Not enough master candidates: actual %d, target %d" %
|
281 |
(mc_now, mc_max)) |
282 |
|
283 |
return result
|
284 |
|
285 |
def _UnlockedSetDiskID(self, disk, node_name): |
286 |
"""Convert the unique ID to the ID needed on the target nodes.
|
287 |
|
288 |
This is used only for drbd, which needs ip/port configuration.
|
289 |
|
290 |
The routine descends down and updates its children also, because
|
291 |
this helps when the only the top device is passed to the remote
|
292 |
node.
|
293 |
|
294 |
This function is for internal use, when the config lock is already held.
|
295 |
|
296 |
"""
|
297 |
if disk.children:
|
298 |
for child in disk.children: |
299 |
self._UnlockedSetDiskID(child, node_name)
|
300 |
|
301 |
if disk.logical_id is None and disk.physical_id is not None: |
302 |
return
|
303 |
if disk.dev_type == constants.LD_DRBD8:
|
304 |
pnode, snode, port, pminor, sminor, secret = disk.logical_id |
305 |
if node_name not in (pnode, snode): |
306 |
raise errors.ConfigurationError("DRBD device not knowing node %s" % |
307 |
node_name) |
308 |
pnode_info = self._UnlockedGetNodeInfo(pnode)
|
309 |
snode_info = self._UnlockedGetNodeInfo(snode)
|
310 |
if pnode_info is None or snode_info is None: |
311 |
raise errors.ConfigurationError("Can't find primary or secondary node" |
312 |
" for %s" % str(disk)) |
313 |
p_data = (pnode_info.secondary_ip, port) |
314 |
s_data = (snode_info.secondary_ip, port) |
315 |
if pnode == node_name:
|
316 |
disk.physical_id = p_data + s_data + (pminor, secret) |
317 |
else: # it must be secondary, we tested above |
318 |
disk.physical_id = s_data + p_data + (sminor, secret) |
319 |
else:
|
320 |
disk.physical_id = disk.logical_id |
321 |
return
|
322 |
|
323 |
@locking.ssynchronized(_config_lock)
|
324 |
def SetDiskID(self, disk, node_name): |
325 |
"""Convert the unique ID to the ID needed on the target nodes.
|
326 |
|
327 |
This is used only for drbd, which needs ip/port configuration.
|
328 |
|
329 |
The routine descends down and updates its children also, because
|
330 |
this helps when the only the top device is passed to the remote
|
331 |
node.
|
332 |
|
333 |
"""
|
334 |
return self._UnlockedSetDiskID(disk, node_name) |
335 |
|
336 |
@locking.ssynchronized(_config_lock)
|
337 |
def AddTcpUdpPort(self, port): |
338 |
"""Adds a new port to the available port pool.
|
339 |
|
340 |
"""
|
341 |
if not isinstance(port, int): |
342 |
raise errors.ProgrammerError("Invalid type passed for port") |
343 |
|
344 |
self._config_data.cluster.tcpudp_port_pool.add(port)
|
345 |
self._WriteConfig()
|
346 |
|
347 |
@locking.ssynchronized(_config_lock, shared=1) |
348 |
def GetPortList(self): |
349 |
"""Returns a copy of the current port list.
|
350 |
|
351 |
"""
|
352 |
return self._config_data.cluster.tcpudp_port_pool.copy() |
353 |
|
354 |
@locking.ssynchronized(_config_lock)
|
355 |
def AllocatePort(self): |
356 |
"""Allocate a port.
|
357 |
|
358 |
The port will be taken from the available port pool or from the
|
359 |
default port range (and in this case we increase
|
360 |
highest_used_port).
|
361 |
|
362 |
"""
|
363 |
# If there are TCP/IP ports configured, we use them first.
|
364 |
if self._config_data.cluster.tcpudp_port_pool: |
365 |
port = self._config_data.cluster.tcpudp_port_pool.pop()
|
366 |
else:
|
367 |
port = self._config_data.cluster.highest_used_port + 1 |
368 |
if port >= constants.LAST_DRBD_PORT:
|
369 |
raise errors.ConfigurationError("The highest used port is greater" |
370 |
" than %s. Aborting." %
|
371 |
constants.LAST_DRBD_PORT) |
372 |
self._config_data.cluster.highest_used_port = port
|
373 |
|
374 |
self._WriteConfig()
|
375 |
return port
|
376 |
|
377 |
def _ComputeDRBDMap(self, instance): |
378 |
"""Compute the used DRBD minor/nodes.
|
379 |
|
380 |
Return: dictionary of node_name: dict of minor: instance_name. The
|
381 |
returned dict will have all the nodes in it (even if with an empty
|
382 |
list).
|
383 |
|
384 |
"""
|
385 |
def _AppendUsedPorts(instance_name, disk, used): |
386 |
if disk.dev_type == constants.LD_DRBD8 and len(disk.logical_id) >= 5: |
387 |
nodeA, nodeB, dummy, minorA, minorB = disk.logical_id[:5]
|
388 |
for node, port in ((nodeA, minorA), (nodeB, minorB)): |
389 |
assert node in used, "Instance node not found in node list" |
390 |
if port in used[node]: |
391 |
raise errors.ProgrammerError("DRBD minor already used:" |
392 |
" %s/%s, %s/%s" %
|
393 |
(node, port, instance_name, |
394 |
used[node][port])) |
395 |
|
396 |
used[node][port] = instance_name |
397 |
if disk.children:
|
398 |
for child in disk.children: |
399 |
_AppendUsedPorts(instance_name, child, used) |
400 |
|
401 |
my_dict = dict((node, {}) for node in self._config_data.nodes) |
402 |
for (node, minor), instance in self._temporary_drbds.iteritems(): |
403 |
my_dict[node][minor] = instance |
404 |
for instance in self._config_data.instances.itervalues(): |
405 |
for disk in instance.disks: |
406 |
_AppendUsedPorts(instance.name, disk, my_dict) |
407 |
return my_dict
|
408 |
|
409 |
@locking.ssynchronized(_config_lock)
|
410 |
def AllocateDRBDMinor(self, nodes, instance): |
411 |
"""Allocate a drbd minor.
|
412 |
|
413 |
The free minor will be automatically computed from the existing
|
414 |
devices. A node can be given multiple times in order to allocate
|
415 |
multiple minors. The result is the list of minors, in the same
|
416 |
order as the passed nodes.
|
417 |
|
418 |
"""
|
419 |
d_map = self._ComputeDRBDMap(instance)
|
420 |
result = [] |
421 |
for nname in nodes: |
422 |
ndata = d_map[nname] |
423 |
if not ndata: |
424 |
# no minors used, we can start at 0
|
425 |
result.append(0)
|
426 |
ndata[0] = instance
|
427 |
self._temporary_drbds[(nname, 0)] = instance |
428 |
continue
|
429 |
keys = ndata.keys() |
430 |
keys.sort() |
431 |
ffree = utils.FirstFree(keys) |
432 |
if ffree is None: |
433 |
# return the next minor
|
434 |
# TODO: implement high-limit check
|
435 |
minor = keys[-1] + 1 |
436 |
else:
|
437 |
minor = ffree |
438 |
result.append(minor) |
439 |
ndata[minor] = instance |
440 |
assert (nname, minor) not in self._temporary_drbds, \ |
441 |
"Attempt to reuse reserved DRBD minor"
|
442 |
self._temporary_drbds[(nname, minor)] = instance
|
443 |
logging.debug("Request to allocate drbd minors, input: %s, returning %s",
|
444 |
nodes, result) |
445 |
return result
|
446 |
|
447 |
@locking.ssynchronized(_config_lock)
|
448 |
def ReleaseDRBDMinors(self, instance): |
449 |
"""Release temporary drbd minors allocated for a given instance.
|
450 |
|
451 |
This should be called on both the error paths and on the success
|
452 |
paths (after the instance has been added or updated).
|
453 |
|
454 |
@type instance: string
|
455 |
@param instance: the instance for which temporary minors should be
|
456 |
released
|
457 |
|
458 |
"""
|
459 |
for key, name in self._temporary_drbds.items(): |
460 |
if name == instance:
|
461 |
del self._temporary_drbds[key] |
462 |
|
463 |
@locking.ssynchronized(_config_lock, shared=1) |
464 |
def GetConfigVersion(self): |
465 |
"""Get the configuration version.
|
466 |
|
467 |
@return: Config version
|
468 |
|
469 |
"""
|
470 |
return self._config_data.version |
471 |
|
472 |
@locking.ssynchronized(_config_lock, shared=1) |
473 |
def GetClusterName(self): |
474 |
"""Get cluster name.
|
475 |
|
476 |
@return: Cluster name
|
477 |
|
478 |
"""
|
479 |
return self._config_data.cluster.cluster_name |
480 |
|
481 |
@locking.ssynchronized(_config_lock, shared=1) |
482 |
def GetMasterNode(self): |
483 |
"""Get the hostname of the master node for this cluster.
|
484 |
|
485 |
@return: Master hostname
|
486 |
|
487 |
"""
|
488 |
return self._config_data.cluster.master_node |
489 |
|
490 |
@locking.ssynchronized(_config_lock, shared=1) |
491 |
def GetMasterIP(self): |
492 |
"""Get the IP of the master node for this cluster.
|
493 |
|
494 |
@return: Master IP
|
495 |
|
496 |
"""
|
497 |
return self._config_data.cluster.master_ip |
498 |
|
499 |
@locking.ssynchronized(_config_lock, shared=1) |
500 |
def GetMasterNetdev(self): |
501 |
"""Get the master network device for this cluster.
|
502 |
|
503 |
"""
|
504 |
return self._config_data.cluster.master_netdev |
505 |
|
506 |
@locking.ssynchronized(_config_lock, shared=1) |
507 |
def GetFileStorageDir(self): |
508 |
"""Get the file storage dir for this cluster.
|
509 |
|
510 |
"""
|
511 |
return self._config_data.cluster.file_storage_dir |
512 |
|
513 |
@locking.ssynchronized(_config_lock, shared=1) |
514 |
def GetHypervisorType(self): |
515 |
"""Get the hypervisor type for this cluster.
|
516 |
|
517 |
"""
|
518 |
return self._config_data.cluster.default_hypervisor |
519 |
|
520 |
@locking.ssynchronized(_config_lock, shared=1) |
521 |
def GetHostKey(self): |
522 |
"""Return the rsa hostkey from the config.
|
523 |
|
524 |
Args: None
|
525 |
|
526 |
Returns: rsa hostkey
|
527 |
"""
|
528 |
return self._config_data.cluster.rsahostkeypub |
529 |
|
530 |
@locking.ssynchronized(_config_lock)
|
531 |
def AddInstance(self, instance): |
532 |
"""Add an instance to the config.
|
533 |
|
534 |
This should be used after creating a new instance.
|
535 |
|
536 |
Args:
|
537 |
instance: the instance object
|
538 |
"""
|
539 |
if not isinstance(instance, objects.Instance): |
540 |
raise errors.ProgrammerError("Invalid type passed to AddInstance") |
541 |
|
542 |
if instance.disk_template != constants.DT_DISKLESS:
|
543 |
all_lvs = instance.MapLVsByNode() |
544 |
logging.info("Instance '%s' DISK_LAYOUT: %s", instance.name, all_lvs)
|
545 |
|
546 |
instance.serial_no = 1
|
547 |
self._config_data.instances[instance.name] = instance
|
548 |
self._WriteConfig()
|
549 |
|
550 |
def _SetInstanceStatus(self, instance_name, status): |
551 |
"""Set the instance's status to a given value.
|
552 |
|
553 |
"""
|
554 |
if status not in ("up", "down"): |
555 |
raise errors.ProgrammerError("Invalid status '%s' passed to" |
556 |
" ConfigWriter._SetInstanceStatus()" %
|
557 |
status) |
558 |
|
559 |
if instance_name not in self._config_data.instances: |
560 |
raise errors.ConfigurationError("Unknown instance '%s'" % |
561 |
instance_name) |
562 |
instance = self._config_data.instances[instance_name]
|
563 |
if instance.status != status:
|
564 |
instance.status = status |
565 |
instance.serial_no += 1
|
566 |
self._WriteConfig()
|
567 |
|
568 |
@locking.ssynchronized(_config_lock)
|
569 |
def MarkInstanceUp(self, instance_name): |
570 |
"""Mark the instance status to up in the config.
|
571 |
|
572 |
"""
|
573 |
self._SetInstanceStatus(instance_name, "up") |
574 |
|
575 |
@locking.ssynchronized(_config_lock)
|
576 |
def RemoveInstance(self, instance_name): |
577 |
"""Remove the instance from the configuration.
|
578 |
|
579 |
"""
|
580 |
if instance_name not in self._config_data.instances: |
581 |
raise errors.ConfigurationError("Unknown instance '%s'" % instance_name) |
582 |
del self._config_data.instances[instance_name] |
583 |
self._WriteConfig()
|
584 |
|
585 |
@locking.ssynchronized(_config_lock)
|
586 |
def RenameInstance(self, old_name, new_name): |
587 |
"""Rename an instance.
|
588 |
|
589 |
This needs to be done in ConfigWriter and not by RemoveInstance
|
590 |
combined with AddInstance as only we can guarantee an atomic
|
591 |
rename.
|
592 |
|
593 |
"""
|
594 |
if old_name not in self._config_data.instances: |
595 |
raise errors.ConfigurationError("Unknown instance '%s'" % old_name) |
596 |
inst = self._config_data.instances[old_name]
|
597 |
del self._config_data.instances[old_name] |
598 |
inst.name = new_name |
599 |
|
600 |
for disk in inst.disks: |
601 |
if disk.dev_type == constants.LD_FILE:
|
602 |
# rename the file paths in logical and physical id
|
603 |
file_storage_dir = os.path.dirname(os.path.dirname(disk.logical_id[1]))
|
604 |
disk.physical_id = disk.logical_id = (disk.logical_id[0],
|
605 |
os.path.join(file_storage_dir, |
606 |
inst.name, |
607 |
disk.iv_name)) |
608 |
|
609 |
self._config_data.instances[inst.name] = inst
|
610 |
self._WriteConfig()
|
611 |
|
612 |
@locking.ssynchronized(_config_lock)
|
613 |
def MarkInstanceDown(self, instance_name): |
614 |
"""Mark the status of an instance to down in the configuration.
|
615 |
|
616 |
"""
|
617 |
self._SetInstanceStatus(instance_name, "down") |
618 |
|
619 |
def _UnlockedGetInstanceList(self): |
620 |
"""Get the list of instances.
|
621 |
|
622 |
This function is for internal use, when the config lock is already held.
|
623 |
|
624 |
"""
|
625 |
return self._config_data.instances.keys() |
626 |
|
627 |
@locking.ssynchronized(_config_lock, shared=1) |
628 |
def GetInstanceList(self): |
629 |
"""Get the list of instances.
|
630 |
|
631 |
Returns:
|
632 |
array of instances, ex. ['instance2.example.com','instance1.example.com']
|
633 |
these contains all the instances, also the ones in Admin_down state
|
634 |
|
635 |
"""
|
636 |
return self._UnlockedGetInstanceList() |
637 |
|
638 |
@locking.ssynchronized(_config_lock, shared=1) |
639 |
def ExpandInstanceName(self, short_name): |
640 |
"""Attempt to expand an incomplete instance name.
|
641 |
|
642 |
"""
|
643 |
return utils.MatchNameComponent(short_name,
|
644 |
self._config_data.instances.keys())
|
645 |
|
646 |
def _UnlockedGetInstanceInfo(self, instance_name): |
647 |
"""Returns informations about an instance.
|
648 |
|
649 |
This function is for internal use, when the config lock is already held.
|
650 |
|
651 |
"""
|
652 |
if instance_name not in self._config_data.instances: |
653 |
return None |
654 |
|
655 |
return self._config_data.instances[instance_name] |
656 |
|
657 |
@locking.ssynchronized(_config_lock, shared=1) |
658 |
def GetInstanceInfo(self, instance_name): |
659 |
"""Returns informations about an instance.
|
660 |
|
661 |
It takes the information from the configuration file. Other informations of
|
662 |
an instance are taken from the live systems.
|
663 |
|
664 |
Args:
|
665 |
instance: name of the instance, ex instance1.example.com
|
666 |
|
667 |
Returns:
|
668 |
the instance object
|
669 |
|
670 |
"""
|
671 |
return self._UnlockedGetInstanceInfo(instance_name) |
672 |
|
673 |
@locking.ssynchronized(_config_lock, shared=1) |
674 |
def GetAllInstancesInfo(self): |
675 |
"""Get the configuration of all instances.
|
676 |
|
677 |
@rtype: dict
|
678 |
@returns: dict of (instance, instance_info), where instance_info is what
|
679 |
would GetInstanceInfo return for the node
|
680 |
|
681 |
"""
|
682 |
my_dict = dict([(instance, self._UnlockedGetInstanceInfo(instance)) |
683 |
for instance in self._UnlockedGetInstanceList()]) |
684 |
return my_dict
|
685 |
|
686 |
@locking.ssynchronized(_config_lock)
|
687 |
def AddNode(self, node): |
688 |
"""Add a node to the configuration.
|
689 |
|
690 |
Args:
|
691 |
node: an object.Node instance
|
692 |
|
693 |
"""
|
694 |
logging.info("Adding node %s to configuration" % node.name)
|
695 |
|
696 |
node.serial_no = 1
|
697 |
self._config_data.nodes[node.name] = node
|
698 |
self._config_data.cluster.serial_no += 1 |
699 |
self._WriteConfig()
|
700 |
|
701 |
@locking.ssynchronized(_config_lock)
|
702 |
def RemoveNode(self, node_name): |
703 |
"""Remove a node from the configuration.
|
704 |
|
705 |
"""
|
706 |
logging.info("Removing node %s from configuration" % node_name)
|
707 |
|
708 |
if node_name not in self._config_data.nodes: |
709 |
raise errors.ConfigurationError("Unknown node '%s'" % node_name) |
710 |
|
711 |
del self._config_data.nodes[node_name] |
712 |
self._config_data.cluster.serial_no += 1 |
713 |
self._WriteConfig()
|
714 |
|
715 |
@locking.ssynchronized(_config_lock, shared=1) |
716 |
def ExpandNodeName(self, short_name): |
717 |
"""Attempt to expand an incomplete instance name.
|
718 |
|
719 |
"""
|
720 |
return utils.MatchNameComponent(short_name,
|
721 |
self._config_data.nodes.keys())
|
722 |
|
723 |
def _UnlockedGetNodeInfo(self, node_name): |
724 |
"""Get the configuration of a node, as stored in the config.
|
725 |
|
726 |
This function is for internal use, when the config lock is already held.
|
727 |
|
728 |
Args: node: nodename (tuple) of the node
|
729 |
|
730 |
Returns: the node object
|
731 |
|
732 |
"""
|
733 |
if node_name not in self._config_data.nodes: |
734 |
return None |
735 |
|
736 |
return self._config_data.nodes[node_name] |
737 |
|
738 |
|
739 |
@locking.ssynchronized(_config_lock, shared=1) |
740 |
def GetNodeInfo(self, node_name): |
741 |
"""Get the configuration of a node, as stored in the config.
|
742 |
|
743 |
Args: node: nodename (tuple) of the node
|
744 |
|
745 |
Returns: the node object
|
746 |
|
747 |
"""
|
748 |
return self._UnlockedGetNodeInfo(node_name) |
749 |
|
750 |
def _UnlockedGetNodeList(self): |
751 |
"""Return the list of nodes which are in the configuration.
|
752 |
|
753 |
This function is for internal use, when the config lock is already held.
|
754 |
|
755 |
"""
|
756 |
return self._config_data.nodes.keys() |
757 |
|
758 |
|
759 |
@locking.ssynchronized(_config_lock, shared=1) |
760 |
def GetNodeList(self): |
761 |
"""Return the list of nodes which are in the configuration.
|
762 |
|
763 |
"""
|
764 |
return self._UnlockedGetNodeList() |
765 |
|
766 |
@locking.ssynchronized(_config_lock, shared=1) |
767 |
def GetAllNodesInfo(self): |
768 |
"""Get the configuration of all nodes.
|
769 |
|
770 |
@rtype: dict
|
771 |
@return: dict of (node, node_info), where node_info is what
|
772 |
would GetNodeInfo return for the node
|
773 |
|
774 |
"""
|
775 |
my_dict = dict([(node, self._UnlockedGetNodeInfo(node)) |
776 |
for node in self._UnlockedGetNodeList()]) |
777 |
return my_dict
|
778 |
|
779 |
def _UnlockedGetMasterCandidateStats(self): |
780 |
"""Get the number of current and maximum desired and possible candidates.
|
781 |
|
782 |
@rtype: tuple
|
783 |
@return: tuple of (current, desired and possible)
|
784 |
|
785 |
"""
|
786 |
mc_now = mc_max = 0
|
787 |
for node in self._config_data.nodes.itervalues(): |
788 |
if not node.offline: |
789 |
mc_max += 1
|
790 |
if node.master_candidate:
|
791 |
mc_now += 1
|
792 |
mc_max = min(mc_max, self._config_data.cluster.candidate_pool_size) |
793 |
return (mc_now, mc_max)
|
794 |
|
795 |
@locking.ssynchronized(_config_lock, shared=1) |
796 |
def GetMasterCandidateStats(self): |
797 |
"""Get the number of current and maximum possible candidates.
|
798 |
|
799 |
This is just a wrapper over L{_UnlockedGetMasterCandidateStats}.
|
800 |
|
801 |
@rtype: tuple
|
802 |
@return: tuple of (current, max)
|
803 |
|
804 |
"""
|
805 |
return self._UnlockedGetMasterCandidateStats() |
806 |
|
807 |
@locking.ssynchronized(_config_lock)
|
808 |
def MaintainCandidatePool(self): |
809 |
"""Try to grow the candidate pool to the desired size.
|
810 |
|
811 |
@rtype: list
|
812 |
@return: list with the adjusted nodes (L{objects.Node} instances)
|
813 |
|
814 |
"""
|
815 |
mc_now, mc_max = self._UnlockedGetMasterCandidateStats()
|
816 |
mod_list = [] |
817 |
if mc_now < mc_max:
|
818 |
node_list = self._config_data.nodes.keys()
|
819 |
random.shuffle(node_list) |
820 |
for name in node_list: |
821 |
if mc_now >= mc_max:
|
822 |
break
|
823 |
node = self._config_data.nodes[name]
|
824 |
if node.master_candidate or node.offline: |
825 |
continue
|
826 |
mod_list.append(node) |
827 |
node.master_candidate = True
|
828 |
node.serial_no += 1
|
829 |
mc_now += 1
|
830 |
if mc_now != mc_max:
|
831 |
# this should not happen
|
832 |
logging.warning("Warning: MaintainCandidatePool didn't manage to"
|
833 |
" fill the candidate pool (%d/%d)", mc_now, mc_max)
|
834 |
if mod_list:
|
835 |
self._config_data.cluster.serial_no += 1 |
836 |
self._WriteConfig()
|
837 |
|
838 |
return mod_list
|
839 |
|
840 |
def _BumpSerialNo(self): |
841 |
"""Bump up the serial number of the config.
|
842 |
|
843 |
"""
|
844 |
self._config_data.serial_no += 1 |
845 |
|
846 |
def _OpenConfig(self): |
847 |
"""Read the config data from disk.
|
848 |
|
849 |
In case we already have configuration data and the config file has
|
850 |
the same mtime as when we read it, we skip the parsing of the
|
851 |
file, since de-serialisation could be slow.
|
852 |
|
853 |
"""
|
854 |
f = open(self._cfg_file, 'r') |
855 |
try:
|
856 |
try:
|
857 |
data = objects.ConfigData.FromDict(serializer.Load(f.read())) |
858 |
except Exception, err: |
859 |
raise errors.ConfigurationError(err)
|
860 |
finally:
|
861 |
f.close() |
862 |
|
863 |
# Make sure the configuration has the right version
|
864 |
_ValidateConfig(data) |
865 |
|
866 |
if (not hasattr(data, 'cluster') or |
867 |
not hasattr(data.cluster, 'rsahostkeypub')): |
868 |
raise errors.ConfigurationError("Incomplete configuration" |
869 |
" (missing cluster.rsahostkeypub)")
|
870 |
self._config_data = data
|
871 |
# init the last serial as -1 so that the next write will cause
|
872 |
# ssconf update
|
873 |
self._last_cluster_serial = -1 |
874 |
|
875 |
def _DistributeConfig(self): |
876 |
"""Distribute the configuration to the other nodes.
|
877 |
|
878 |
Currently, this only copies the configuration file. In the future,
|
879 |
it could be used to encapsulate the 2/3-phase update mechanism.
|
880 |
|
881 |
"""
|
882 |
if self._offline: |
883 |
return True |
884 |
bad = False
|
885 |
|
886 |
node_list = [] |
887 |
addr_list = [] |
888 |
myhostname = self._my_hostname
|
889 |
# we can skip checking whether _UnlockedGetNodeInfo returns None
|
890 |
# since the node list comes from _UnlocketGetNodeList, and we are
|
891 |
# called with the lock held, so no modifications should take place
|
892 |
# in between
|
893 |
for node_name in self._UnlockedGetNodeList(): |
894 |
if node_name == myhostname:
|
895 |
continue
|
896 |
node_info = self._UnlockedGetNodeInfo(node_name)
|
897 |
if not node_info.master_candidate: |
898 |
continue
|
899 |
node_list.append(node_info.name) |
900 |
addr_list.append(node_info.primary_ip) |
901 |
|
902 |
result = rpc.RpcRunner.call_upload_file(node_list, self._cfg_file,
|
903 |
address_list=addr_list) |
904 |
for node in node_list: |
905 |
if not result[node]: |
906 |
logging.error("copy of file %s to node %s failed",
|
907 |
self._cfg_file, node)
|
908 |
bad = True
|
909 |
return not bad |
910 |
|
911 |
def _WriteConfig(self, destination=None): |
912 |
"""Write the configuration data to persistent storage.
|
913 |
|
914 |
"""
|
915 |
if destination is None: |
916 |
destination = self._cfg_file
|
917 |
self._BumpSerialNo()
|
918 |
txt = serializer.Dump(self._config_data.ToDict())
|
919 |
dir_name, file_name = os.path.split(destination) |
920 |
fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
|
921 |
f = os.fdopen(fd, 'w')
|
922 |
try:
|
923 |
f.write(txt) |
924 |
os.fsync(f.fileno()) |
925 |
finally:
|
926 |
f.close() |
927 |
# we don't need to do os.close(fd) as f.close() did it
|
928 |
os.rename(name, destination) |
929 |
self.write_count += 1 |
930 |
|
931 |
# and redistribute the config file to master candidates
|
932 |
self._DistributeConfig()
|
933 |
|
934 |
# Write ssconf files on all nodes (including locally)
|
935 |
if self._last_cluster_serial < self._config_data.cluster.serial_no: |
936 |
if not self._offline: |
937 |
rpc.RpcRunner.call_write_ssconf_files(self._UnlockedGetNodeList(),
|
938 |
self._UnlockedGetSsconfValues())
|
939 |
self._last_cluster_serial = self._config_data.cluster.serial_no |
940 |
|
941 |
def _UnlockedGetSsconfValues(self): |
942 |
"""Return the values needed by ssconf.
|
943 |
|
944 |
@rtype: dict
|
945 |
@return: a dictionary with keys the ssconf names and values their
|
946 |
associated value
|
947 |
|
948 |
"""
|
949 |
fn = "\n".join
|
950 |
node_names = utils.NiceSort(self._UnlockedGetNodeList())
|
951 |
node_info = [self._UnlockedGetNodeInfo(name) for name in node_names] |
952 |
|
953 |
off_data = fn(node.name for node in node_info if node.offline) |
954 |
mc_data = fn(node.name for node in node_info if node.master_candidate) |
955 |
node_data = fn(node_names) |
956 |
|
957 |
cluster = self._config_data.cluster
|
958 |
return {
|
959 |
constants.SS_CLUSTER_NAME: cluster.cluster_name, |
960 |
constants.SS_FILE_STORAGE_DIR: cluster.file_storage_dir, |
961 |
constants.SS_MASTER_CANDIDATES: mc_data, |
962 |
constants.SS_MASTER_IP: cluster.master_ip, |
963 |
constants.SS_MASTER_NETDEV: cluster.master_netdev, |
964 |
constants.SS_MASTER_NODE: cluster.master_node, |
965 |
constants.SS_NODE_LIST: node_data, |
966 |
constants.SS_OFFLINE_NODES: off_data, |
967 |
} |
968 |
|
969 |
@locking.ssynchronized(_config_lock)
|
970 |
def InitConfig(self, version, cluster_config, master_node_config): |
971 |
"""Create the initial cluster configuration.
|
972 |
|
973 |
It will contain the current node, which will also be the master
|
974 |
node, and no instances.
|
975 |
|
976 |
@type version: int
|
977 |
@param version: Configuration version
|
978 |
@type cluster_config: objects.Cluster
|
979 |
@param cluster_config: Cluster configuration
|
980 |
@type master_node_config: objects.Node
|
981 |
@param master_node_config: Master node configuration
|
982 |
|
983 |
"""
|
984 |
nodes = { |
985 |
master_node_config.name: master_node_config, |
986 |
} |
987 |
|
988 |
self._config_data = objects.ConfigData(version=version,
|
989 |
cluster=cluster_config, |
990 |
nodes=nodes, |
991 |
instances={}, |
992 |
serial_no=1)
|
993 |
self._WriteConfig()
|
994 |
|
995 |
@locking.ssynchronized(_config_lock, shared=1) |
996 |
def GetVGName(self): |
997 |
"""Return the volume group name.
|
998 |
|
999 |
"""
|
1000 |
return self._config_data.cluster.volume_group_name |
1001 |
|
1002 |
@locking.ssynchronized(_config_lock)
|
1003 |
def SetVGName(self, vg_name): |
1004 |
"""Set the volume group name.
|
1005 |
|
1006 |
"""
|
1007 |
self._config_data.cluster.volume_group_name = vg_name
|
1008 |
self._config_data.cluster.serial_no += 1 |
1009 |
self._WriteConfig()
|
1010 |
|
1011 |
@locking.ssynchronized(_config_lock, shared=1) |
1012 |
def GetDefBridge(self): |
1013 |
"""Return the default bridge.
|
1014 |
|
1015 |
"""
|
1016 |
return self._config_data.cluster.default_bridge |
1017 |
|
1018 |
@locking.ssynchronized(_config_lock, shared=1) |
1019 |
def GetMACPrefix(self): |
1020 |
"""Return the mac prefix.
|
1021 |
|
1022 |
"""
|
1023 |
return self._config_data.cluster.mac_prefix |
1024 |
|
1025 |
@locking.ssynchronized(_config_lock, shared=1) |
1026 |
def GetClusterInfo(self): |
1027 |
"""Returns informations about the cluster
|
1028 |
|
1029 |
Returns:
|
1030 |
the cluster object
|
1031 |
|
1032 |
"""
|
1033 |
return self._config_data.cluster |
1034 |
|
1035 |
@locking.ssynchronized(_config_lock)
|
1036 |
def Update(self, target): |
1037 |
"""Notify function to be called after updates.
|
1038 |
|
1039 |
This function must be called when an object (as returned by
|
1040 |
GetInstanceInfo, GetNodeInfo, GetCluster) has been updated and the
|
1041 |
caller wants the modifications saved to the backing store. Note
|
1042 |
that all modified objects will be saved, but the target argument
|
1043 |
is the one the caller wants to ensure that it's saved.
|
1044 |
|
1045 |
"""
|
1046 |
if self._config_data is None: |
1047 |
raise errors.ProgrammerError("Configuration file not read," |
1048 |
" cannot save.")
|
1049 |
update_serial = False
|
1050 |
if isinstance(target, objects.Cluster): |
1051 |
test = target == self._config_data.cluster
|
1052 |
elif isinstance(target, objects.Node): |
1053 |
test = target in self._config_data.nodes.values() |
1054 |
update_serial = True
|
1055 |
elif isinstance(target, objects.Instance): |
1056 |
test = target in self._config_data.instances.values() |
1057 |
else:
|
1058 |
raise errors.ProgrammerError("Invalid object type (%s) passed to" |
1059 |
" ConfigWriter.Update" % type(target)) |
1060 |
if not test: |
1061 |
raise errors.ConfigurationError("Configuration updated since object" |
1062 |
" has been read or unknown object")
|
1063 |
target.serial_no += 1
|
1064 |
|
1065 |
if update_serial:
|
1066 |
# for node updates, we need to increase the cluster serial too
|
1067 |
self._config_data.cluster.serial_no += 1 |
1068 |
|
1069 |
self._WriteConfig()
|