4 # Copyright (C) 2006, 2007, 2008, 2010, 2011, 2012 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 """Global Configuration data for Ganeti.
24 This module provides the interface to a special case of cluster
25 configuration data, which is mostly static and available to all nodes.
34 from ganeti import errors
35 from ganeti import constants
36 from ganeti import utils
37 from ganeti import serializer
38 from ganeti import objects
39 from ganeti import netutils
40 from ganeti import pathutils
43 SSCONF_LOCK_TIMEOUT = 10
45 RE_VALID_SSCONF_NAME = re.compile(r"^[-_a-z0-9]+$")
48 class SimpleConfigReader(object):
49 """Simple class to read configuration file.
52 def __init__(self, file_name=pathutils.CLUSTER_CONF_FILE):
53 """Initializes this class.
55 @type file_name: string
56 @param file_name: Configuration file path
59 self._file_name = file_name
60 self._last_inode = None
61 self._last_mtime = None
62 self._last_size = None
64 self._config_data = None
65 self._inst_ips_by_link = None
66 self._ip_to_inst_by_link = None
67 self._instances_ips = None
68 self._mc_primary_ips = None
69 self._nodes_primary_ips = None
71 # we need a forced reload at class init time, to initialize _last_*
72 self._Load(force=True)
74 def _Load(self, force=False):
75 """Loads (or reloads) the config file.
78 @param force: whether to force the reload without checking the mtime
80 @return: boolean value that says whether we reloaded the configuration or
81 not (because we decided it was already up-to-date)
85 cfg_stat = os.stat(self._file_name)
86 except EnvironmentError, err:
87 raise errors.ConfigurationError("Cannot stat config file %s: %s" %
88 (self._file_name, err))
89 inode = cfg_stat.st_ino
90 mtime = cfg_stat.st_mtime
91 size = cfg_stat.st_size
93 if (force or inode != self._last_inode or
94 mtime > self._last_mtime or
95 size != self._last_size):
96 self._last_inode = inode
97 self._last_mtime = mtime
98 self._last_size = size
104 self._config_data = serializer.Load(utils.ReadFile(self._file_name))
105 except EnvironmentError, err:
106 raise errors.ConfigurationError("Cannot read config file %s: %s" %
107 (self._file_name, err))
108 except ValueError, err:
109 raise errors.ConfigurationError("Cannot load config file %s: %s" %
110 (self._file_name, err))
112 self._ip_to_inst_by_link = {}
113 self._instances_ips = []
114 self._inst_ips_by_link = {}
115 c_nparams = self._config_data["cluster"]["nicparams"][constants.PP_DEFAULT]
116 for iname in self._config_data["instances"]:
117 instance = self._config_data["instances"][iname]
118 for nic in instance["nics"]:
119 if "ip" in nic and nic["ip"]:
120 params = objects.FillDict(c_nparams, nic["nicparams"])
121 if not params["link"] in self._inst_ips_by_link:
122 self._inst_ips_by_link[params["link"]] = []
123 self._ip_to_inst_by_link[params["link"]] = {}
124 self._ip_to_inst_by_link[params["link"]][nic["ip"]] = iname
125 self._inst_ips_by_link[params["link"]].append(nic["ip"])
127 self._nodes_primary_ips = []
128 self._mc_primary_ips = []
129 for node_name in self._config_data["nodes"]:
130 node = self._config_data["nodes"][node_name]
131 self._nodes_primary_ips.append(node["primary_ip"])
132 if node["master_candidate"]:
133 self._mc_primary_ips.append(node["primary_ip"])
137 # Clients can request a reload of the config file, so we export our internal
138 # _Load function as Reload.
141 def GetClusterName(self):
142 return self._config_data["cluster"]["cluster_name"]
144 def GetHostKey(self):
145 return self._config_data["cluster"]["rsahostkeypub"]
147 def GetMasterNode(self):
148 return self._config_data["cluster"]["master_node"]
150 def GetMasterIP(self):
151 return self._config_data["cluster"]["master_ip"]
153 def GetMasterNetdev(self):
154 return self._config_data["cluster"]["master_netdev"]
156 def GetMasterNetmask(self):
157 return self._config_data["cluster"]["master_netmask"]
159 def GetFileStorageDir(self):
160 return self._config_data["cluster"]["file_storage_dir"]
162 def GetSharedFileStorageDir(self):
163 return self._config_data["cluster"]["shared_file_storage_dir"]
165 def GetNodeList(self):
166 return self._config_data["nodes"].keys()
168 def GetConfigSerialNo(self):
169 return self._config_data["serial_no"]
171 def GetClusterSerialNo(self):
172 return self._config_data["cluster"]["serial_no"]
174 def GetDefaultNicParams(self):
175 return self._config_data["cluster"]["nicparams"][constants.PP_DEFAULT]
177 def GetDefaultNicLink(self):
178 return self.GetDefaultNicParams()[constants.NIC_LINK]
180 def GetNodeStatusFlags(self, node):
181 """Get a node's status flags
184 @param node: node name
185 @rtype: (bool, bool, bool)
186 @return: (master_candidate, drained, offline) (or None if no such node)
189 if node not in self._config_data["nodes"]:
192 master_candidate = self._config_data["nodes"][node]["master_candidate"]
193 drained = self._config_data["nodes"][node]["drained"]
194 offline = self._config_data["nodes"][node]["offline"]
195 return master_candidate, drained, offline
197 def GetInstanceByLinkIp(self, ip, link):
198 """Get instance name from its link and ip address.
201 @param ip: ip address
203 @param link: nic link
205 @return: instance name
209 link = self.GetDefaultNicLink()
210 if not link in self._ip_to_inst_by_link:
212 if not ip in self._ip_to_inst_by_link[link]:
214 return self._ip_to_inst_by_link[link][ip]
216 def GetNodePrimaryIp(self, node):
217 """Get a node's primary ip
220 @param node: node name
221 @rtype: string, or None
222 @return: node's primary ip, or None if no such node
225 if node not in self._config_data["nodes"]:
227 return self._config_data["nodes"][node]["primary_ip"]
229 def GetInstancePrimaryNode(self, instance):
230 """Get an instance's primary node
232 @type instance: string
233 @param instance: instance name
234 @rtype: string, or None
235 @return: primary node, or None if no such instance
238 if instance not in self._config_data["instances"]:
240 return self._config_data["instances"][instance]["primary_node"]
242 def GetNodesPrimaryIps(self):
243 return self._nodes_primary_ips
245 def GetMasterCandidatesPrimaryIps(self):
246 return self._mc_primary_ips
248 def GetInstancesIps(self, link):
249 """Get list of nic ips connected to a certain link.
252 @param link: nic link
254 @return: list of ips connected to that link
258 link = self.GetDefaultNicLink()
260 if link in self._inst_ips_by_link:
261 return self._inst_ips_by_link[link]
266 class SimpleStore(object):
267 """Interface to static cluster data.
269 This is different that the config.ConfigWriter and
270 SimpleConfigReader classes in that it holds data that will always be
271 present, even on nodes which don't have all the cluster data.
273 Other particularities of the datastore:
274 - keys are restricted to predefined values
278 constants.SS_CLUSTER_NAME,
279 constants.SS_CLUSTER_TAGS,
280 constants.SS_FILE_STORAGE_DIR,
281 constants.SS_SHARED_FILE_STORAGE_DIR,
282 constants.SS_MASTER_CANDIDATES,
283 constants.SS_MASTER_CANDIDATES_IPS,
284 constants.SS_MASTER_IP,
285 constants.SS_MASTER_NETDEV,
286 constants.SS_MASTER_NETMASK,
287 constants.SS_MASTER_NODE,
288 constants.SS_NODE_LIST,
289 constants.SS_NODE_PRIMARY_IPS,
290 constants.SS_NODE_SECONDARY_IPS,
291 constants.SS_OFFLINE_NODES,
292 constants.SS_ONLINE_NODES,
293 constants.SS_PRIMARY_IP_FAMILY,
294 constants.SS_INSTANCE_LIST,
295 constants.SS_RELEASE_VERSION,
296 constants.SS_HYPERVISOR_LIST,
297 constants.SS_MAINTAIN_NODE_HEALTH,
298 constants.SS_UID_POOL,
299 constants.SS_NODEGROUPS,
300 constants.SS_NETWORKS,
304 def __init__(self, cfg_location=None):
305 if cfg_location is None:
306 self._cfg_dir = pathutils.DATA_DIR
308 self._cfg_dir = cfg_location
310 def KeyToFilename(self, key):
311 """Convert a given key into filename.
314 if key not in self._VALID_KEYS:
315 raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'"
318 filename = self._cfg_dir + "/" + constants.SSCONF_FILEPREFIX + key
321 def _ReadFile(self, key, default=None):
322 """Generic routine to read keys.
324 This will read the file which holds the value requested. Errors
325 will be changed into ConfigurationErrors.
328 filename = self.KeyToFilename(key)
330 data = utils.ReadFile(filename, size=self._MAX_SIZE)
331 except EnvironmentError, err:
332 if err.errno == errno.ENOENT and default is not None:
334 raise errors.ConfigurationError("Can't read from the ssconf file:"
336 data = data.rstrip("\n")
339 def WriteFiles(self, values):
340 """Writes ssconf files used by external scripts.
343 @param values: Dictionary of (name, value)
346 ssconf_lock = utils.FileLock.Open(pathutils.SSCONF_LOCK_FILE)
348 # Get lock while writing files
349 ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
351 for name, value in values.iteritems():
352 if value and not value.endswith("\n"):
354 if len(value) > self._MAX_SIZE:
355 raise errors.ConfigurationError("ssconf file %s above maximum size" %
357 utils.WriteFile(self.KeyToFilename(name), data=value,
358 mode=constants.SS_FILE_PERMS)
362 def GetFileList(self):
363 """Return the list of all config files.
365 This is used for computing node replication data.
368 return [self.KeyToFilename(key) for key in self._VALID_KEYS]
370 def GetClusterName(self):
371 """Get the cluster name.
374 return self._ReadFile(constants.SS_CLUSTER_NAME)
376 def GetFileStorageDir(self):
377 """Get the file storage dir.
380 return self._ReadFile(constants.SS_FILE_STORAGE_DIR)
382 def GetSharedFileStorageDir(self):
383 """Get the shared file storage dir.
386 return self._ReadFile(constants.SS_SHARED_FILE_STORAGE_DIR)
388 def GetMasterCandidates(self):
389 """Return the list of master candidates.
392 data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
393 nl = data.splitlines(False)
396 def GetMasterCandidatesIPList(self):
397 """Return the list of master candidates' primary IP.
400 data = self._ReadFile(constants.SS_MASTER_CANDIDATES_IPS)
401 nl = data.splitlines(False)
404 def GetMasterIP(self):
405 """Get the IP of the master node for this cluster.
408 return self._ReadFile(constants.SS_MASTER_IP)
410 def GetMasterNetdev(self):
411 """Get the netdev to which we'll add the master ip.
414 return self._ReadFile(constants.SS_MASTER_NETDEV)
416 def GetMasterNetmask(self):
417 """Get the master netmask.
421 return self._ReadFile(constants.SS_MASTER_NETMASK)
422 except errors.ConfigurationError:
423 family = self.GetPrimaryIPFamily()
424 ipcls = netutils.IPAddress.GetClassFromIpFamily(family)
427 def GetMasterNode(self):
428 """Get the hostname of the master node for this cluster.
431 return self._ReadFile(constants.SS_MASTER_NODE)
433 def GetNodeList(self):
434 """Return the list of cluster nodes.
437 data = self._ReadFile(constants.SS_NODE_LIST)
438 nl = data.splitlines(False)
441 def GetNodePrimaryIPList(self):
442 """Return the list of cluster nodes' primary IP.
445 data = self._ReadFile(constants.SS_NODE_PRIMARY_IPS)
446 nl = data.splitlines(False)
449 def GetNodeSecondaryIPList(self):
450 """Return the list of cluster nodes' secondary IP.
453 data = self._ReadFile(constants.SS_NODE_SECONDARY_IPS)
454 nl = data.splitlines(False)
457 def GetNodegroupList(self):
458 """Return the list of nodegroups.
461 data = self._ReadFile(constants.SS_NODEGROUPS)
462 nl = data.splitlines(False)
465 def GetNetworkList(self):
466 """Return the list of networks.
469 data = self._ReadFile(constants.SS_NETWORKS)
470 nl = data.splitlines(False)
473 def GetClusterTags(self):
474 """Return the cluster tags.
477 data = self._ReadFile(constants.SS_CLUSTER_TAGS)
478 nl = data.splitlines(False)
481 def GetHypervisorList(self):
482 """Return the list of enabled hypervisors.
485 data = self._ReadFile(constants.SS_HYPERVISOR_LIST)
486 nl = data.splitlines(False)
489 def GetMaintainNodeHealth(self):
490 """Return the value of the maintain_node_health option.
493 data = self._ReadFile(constants.SS_MAINTAIN_NODE_HEALTH)
494 # we rely on the bool serialization here
495 return data == "True"
497 def GetUidPool(self):
498 """Return the user-id pool definition string.
500 The separator character is a newline.
502 The return value can be parsed using uidpool.ParseUidPool()::
504 ss = ssconf.SimpleStore()
505 uid_pool = uidpool.ParseUidPool(ss.GetUidPool(), separator="\\n")
508 data = self._ReadFile(constants.SS_UID_POOL)
511 def GetPrimaryIPFamily(self):
512 """Return the cluster-wide primary address family.
516 return int(self._ReadFile(constants.SS_PRIMARY_IP_FAMILY,
517 default=netutils.IP4Address.family))
518 except (ValueError, TypeError), err:
519 raise errors.ConfigurationError("Error while trying to parse primary ip"
523 def WriteSsconfFiles(values):
524 """Update all ssconf files.
526 Wrapper around L{SimpleStore.WriteFiles}.
529 SimpleStore().WriteFiles(values)
532 def GetMasterAndMyself(ss=None):
533 """Get the master node and my own hostname.
535 This can be either used for a 'soft' check (compared to CheckMaster,
536 which exits) or just for computing both at the same time.
538 The function does not handle any errors, these should be handled in
539 the caller (errors.ConfigurationError, errors.ResolverError).
541 @param ss: either a sstore.SimpleConfigReader or a
542 sstore.SimpleStore instance
544 @return: a tuple (master node name, my own name)
549 return ss.GetMasterNode(), netutils.Hostname.GetSysName()
552 def CheckMaster(debug, ss=None):
553 """Checks the node setup.
555 If this is the master, the function will return. Otherwise it will
556 exit with an exit code based on the node status.
560 master_name, myself = GetMasterAndMyself(ss)
561 except errors.ConfigurationError, err:
562 print "Cluster configuration incomplete: '%s'" % str(err)
563 sys.exit(constants.EXIT_NODESETUP_ERROR)
564 except errors.ResolverError, err:
565 sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
566 sys.exit(constants.EXIT_NODESETUP_ERROR)
568 if myself != master_name:
570 sys.stderr.write("Not master, exiting.\n")
571 sys.exit(constants.EXIT_NOTMASTER)