4 # Copyright (C) 2006, 2007, 2008 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.
33 from ganeti import errors
34 from ganeti import constants
35 from ganeti import utils
36 from ganeti import serializer
37 from ganeti import objects
40 SSCONF_LOCK_TIMEOUT = 10
42 RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$')
45 class SimpleConfigReader(object):
46 """Simple class to read configuration file.
49 def __init__(self, file_name=constants.CLUSTER_CONF_FILE):
50 """Initializes this class.
52 @type file_name: string
53 @param file_name: Configuration file path
56 self._file_name = file_name
57 self._last_inode = None
58 self._last_mtime = None
59 self._last_size = None
61 self._config_data = None
62 self._inst_ips_by_link = None
63 self._ip_to_inst_by_link = None
64 self._instances_ips = None
65 self._mc_primary_ips = None
66 self._nodes_primary_ips = None
68 # we need a forced reload at class init time, to initialize _last_*
69 self._Load(force=True)
71 def _Load(self, force=False):
72 """Loads (or reloads) the config file.
75 @param force: whether to force the reload without checking the mtime
77 @return: boolean value that says whether we reloaded the configuration or
78 not (because we decided it was already up-to-date)
82 cfg_stat = os.stat(self._file_name)
83 except EnvironmentError, err:
84 raise errors.ConfigurationError("Cannot stat config file %s: %s" %
85 (self._file_name, err))
86 inode = cfg_stat.st_ino
87 mtime = cfg_stat.st_mtime
88 size = cfg_stat.st_size
90 if (force or inode != self._last_inode or
91 mtime > self._last_mtime or
92 size != self._last_size):
93 self._last_inode = inode
94 self._last_mtime = mtime
95 self._last_size = size
101 self._config_data = serializer.Load(utils.ReadFile(self._file_name))
102 except EnvironmentError, err:
103 raise errors.ConfigurationError("Cannot read config file %s: %s" %
104 (self._file_name, err))
105 except ValueError, err:
106 raise errors.ConfigurationError("Cannot load config file %s: %s" %
107 (self._file_name, err))
109 self._ip_to_inst_by_link = {}
110 self._instances_ips = []
111 self._inst_ips_by_link = {}
112 c_nparams = self._config_data['cluster']['nicparams'][constants.PP_DEFAULT]
113 for iname in self._config_data['instances']:
114 instance = self._config_data['instances'][iname]
115 for nic in instance['nics']:
116 if 'ip' in nic and nic['ip']:
117 params = objects.FillDict(c_nparams, nic['nicparams'])
118 if not params['link'] in self._inst_ips_by_link:
119 self._inst_ips_by_link[params['link']] = []
120 self._ip_to_inst_by_link[params['link']] = {}
121 self._ip_to_inst_by_link[params['link']][nic['ip']] = iname
122 self._inst_ips_by_link[params['link']].append(nic['ip'])
124 self._nodes_primary_ips = []
125 self._mc_primary_ips = []
126 for node_name in self._config_data["nodes"]:
127 node = self._config_data["nodes"][node_name]
128 self._nodes_primary_ips.append(node["primary_ip"])
129 if node["master_candidate"]:
130 self._mc_primary_ips.append(node["primary_ip"])
134 # Clients can request a reload of the config file, so we export our internal
135 # _Load function as Reload.
138 def GetClusterName(self):
139 return self._config_data["cluster"]["cluster_name"]
141 def GetHostKey(self):
142 return self._config_data["cluster"]["rsahostkeypub"]
144 def GetMasterNode(self):
145 return self._config_data["cluster"]["master_node"]
147 def GetMasterIP(self):
148 return self._config_data["cluster"]["master_ip"]
150 def GetMasterNetdev(self):
151 return self._config_data["cluster"]["master_netdev"]
153 def GetFileStorageDir(self):
154 return self._config_data["cluster"]["file_storage_dir"]
156 def GetNodeList(self):
157 return self._config_data["nodes"].keys()
159 def GetConfigSerialNo(self):
160 return self._config_data["serial_no"]
162 def GetClusterSerialNo(self):
163 return self._config_data["cluster"]["serial_no"]
165 def GetDefaultNicParams(self):
166 return self._config_data["cluster"]["nicparams"][constants.PP_DEFAULT]
168 def GetDefaultNicLink(self):
169 return self.GetDefaultNicParams()[constants.NIC_LINK]
171 def GetNodeStatusFlags(self, node):
172 """Get a node's status flags
175 @param node: node name
176 @rtype: (bool, bool, bool)
177 @return: (master_candidate, drained, offline) (or None if no such node)
180 if node not in self._config_data["nodes"]:
183 master_candidate = self._config_data["nodes"][node]["master_candidate"]
184 drained = self._config_data["nodes"][node]["drained"]
185 offline = self._config_data["nodes"][node]["offline"]
186 return master_candidate, drained, offline
188 def GetInstanceByLinkIp(self, ip, link):
190 link = self.GetDefaultNicLink()
191 if not link in self._ip_to_inst_by_link:
193 if not ip in self._ip_to_inst_by_link[link]:
195 return self._ip_to_inst_by_link[link][ip]
197 def GetNodePrimaryIp(self, node):
198 """Get a node's primary ip
201 @param node: node name
202 @rtype: string, or None
203 @return: node's primary ip, or None if no such node
206 if node not in self._config_data["nodes"]:
208 return self._config_data["nodes"][node]["primary_ip"]
210 def GetInstancePrimaryNode(self, instance):
211 """Get an instance's primary node
213 @type instance: string
214 @param instance: instance name
215 @rtype: string, or None
216 @return: primary node, or None if no such instance
219 if instance not in self._config_data["instances"]:
221 return self._config_data["instances"][instance]["primary_node"]
223 def GetNodesPrimaryIps(self):
224 return self._nodes_primary_ips
226 def GetMasterCandidatesPrimaryIps(self):
227 return self._mc_primary_ips
229 def GetInstancesIps(self, link):
231 link = self.GetDefaultNicLink()
233 if link in self._inst_ips_by_link:
234 return self._inst_ips_by_link[link]
239 class SimpleStore(object):
240 """Interface to static cluster data.
242 This is different that the config.ConfigWriter and
243 SimpleConfigReader classes in that it holds data that will always be
244 present, even on nodes which don't have all the cluster data.
246 Other particularities of the datastore:
247 - keys are restricted to predefined values
250 _SS_FILEPREFIX = "ssconf_"
252 constants.SS_CLUSTER_NAME,
253 constants.SS_CLUSTER_TAGS,
254 constants.SS_FILE_STORAGE_DIR,
255 constants.SS_MASTER_CANDIDATES,
256 constants.SS_MASTER_CANDIDATES_IPS,
257 constants.SS_MASTER_IP,
258 constants.SS_MASTER_NETDEV,
259 constants.SS_MASTER_NODE,
260 constants.SS_NODE_LIST,
261 constants.SS_NODE_PRIMARY_IPS,
262 constants.SS_NODE_SECONDARY_IPS,
263 constants.SS_OFFLINE_NODES,
264 constants.SS_ONLINE_NODES,
265 constants.SS_INSTANCE_LIST,
266 constants.SS_RELEASE_VERSION,
270 def __init__(self, cfg_location=None):
271 if cfg_location is None:
272 self._cfg_dir = constants.DATA_DIR
274 self._cfg_dir = cfg_location
276 def KeyToFilename(self, key):
277 """Convert a given key into filename.
280 if key not in self._VALID_KEYS:
281 raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'"
284 filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key
287 def _ReadFile(self, key):
288 """Generic routine to read keys.
290 This will read the file which holds the value requested. Errors
291 will be changed into ConfigurationErrors.
294 filename = self.KeyToFilename(key)
296 data = utils.ReadFile(filename, size=self._MAX_SIZE)
297 except EnvironmentError, err:
298 raise errors.ConfigurationError("Can't read from the ssconf file:"
300 data = data.rstrip('\n')
303 def WriteFiles(self, values):
304 """Writes ssconf files used by external scripts.
307 @param values: Dictionary of (name, value)
310 ssconf_lock = utils.FileLock.Open(constants.SSCONF_LOCK_FILE)
312 # Get lock while writing files
313 ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
315 for name, value in values.iteritems():
316 if value and not value.endswith("\n"):
318 utils.WriteFile(self.KeyToFilename(name), data=value, mode=0444)
322 def GetFileList(self):
323 """Return the list of all config files.
325 This is used for computing node replication data.
328 return [self.KeyToFilename(key) for key in self._VALID_KEYS]
330 def GetClusterName(self):
331 """Get the cluster name.
334 return self._ReadFile(constants.SS_CLUSTER_NAME)
336 def GetFileStorageDir(self):
337 """Get the file storage dir.
340 return self._ReadFile(constants.SS_FILE_STORAGE_DIR)
342 def GetMasterCandidates(self):
343 """Return the list of master candidates.
346 data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
347 nl = data.splitlines(False)
350 def GetMasterCandidatesIPList(self):
351 """Return the list of master candidates' primary IP.
354 data = self._ReadFile(constants.SS_MASTER_CANDIDATES_IPS)
355 nl = data.splitlines(False)
358 def GetMasterIP(self):
359 """Get the IP of the master node for this cluster.
362 return self._ReadFile(constants.SS_MASTER_IP)
364 def GetMasterNetdev(self):
365 """Get the netdev to which we'll add the master ip.
368 return self._ReadFile(constants.SS_MASTER_NETDEV)
370 def GetMasterNode(self):
371 """Get the hostname of the master node for this cluster.
374 return self._ReadFile(constants.SS_MASTER_NODE)
376 def GetNodeList(self):
377 """Return the list of cluster nodes.
380 data = self._ReadFile(constants.SS_NODE_LIST)
381 nl = data.splitlines(False)
384 def GetNodePrimaryIPList(self):
385 """Return the list of cluster nodes' primary IP.
388 data = self._ReadFile(constants.SS_NODE_PRIMARY_IPS)
389 nl = data.splitlines(False)
392 def GetNodeSecondaryIPList(self):
393 """Return the list of cluster nodes' secondary IP.
396 data = self._ReadFile(constants.SS_NODE_SECONDARY_IPS)
397 nl = data.splitlines(False)
400 def GetClusterTags(self):
401 """Return the cluster tags.
404 data = self._ReadFile(constants.SS_CLUSTER_TAGS)
405 nl = data.splitlines(False)
409 def GetMasterAndMyself(ss=None):
410 """Get the master node and my own hostname.
412 This can be either used for a 'soft' check (compared to CheckMaster,
413 which exits) or just for computing both at the same time.
415 The function does not handle any errors, these should be handled in
416 the caller (errors.ConfigurationError, errors.ResolverError).
418 @param ss: either a sstore.SimpleConfigReader or a
419 sstore.SimpleStore instance
421 @return: a tuple (master node name, my own name)
426 return ss.GetMasterNode(), utils.HostInfo().name
429 def CheckMaster(debug, ss=None):
430 """Checks the node setup.
432 If this is the master, the function will return. Otherwise it will
433 exit with an exit code based on the node status.
437 master_name, myself = GetMasterAndMyself(ss)
438 except errors.ConfigurationError, err:
439 print "Cluster configuration incomplete: '%s'" % str(err)
440 sys.exit(constants.EXIT_NODESETUP_ERROR)
441 except errors.ResolverError, err:
442 sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
443 sys.exit(constants.EXIT_NODESETUP_ERROR)
445 if myself != master_name:
447 sys.stderr.write("Not master, exiting.\n")
448 sys.exit(constants.EXIT_NOTMASTER)
451 def CheckMasterCandidate(debug, ss=None):
452 """Checks the node setup.
454 If this is a master candidate, the function will return. Otherwise it will
455 exit with an exit code based on the node status.
461 myself = utils.HostInfo().name
462 candidates = ss.GetMasterCandidates()
463 except errors.ConfigurationError, err:
464 print "Cluster configuration incomplete: '%s'" % str(err)
465 sys.exit(constants.EXIT_NODESETUP_ERROR)
466 except errors.ResolverError, err:
467 sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
468 sys.exit(constants.EXIT_NODESETUP_ERROR)
470 if myself not in candidates:
472 sys.stderr.write("Not master candidate, exiting.\n")
473 sys.exit(constants.EXIT_NOTCANDIDATE)