4 # Copyright (C) 2006, 2007, 2008, 2010 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
42 SSCONF_LOCK_TIMEOUT = 10
44 RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$')
47 class SimpleConfigReader(object):
48 """Simple class to read configuration file.
51 def __init__(self, file_name=constants.CLUSTER_CONF_FILE):
52 """Initializes this class.
54 @type file_name: string
55 @param file_name: Configuration file path
58 self._file_name = file_name
59 self._last_inode = None
60 self._last_mtime = None
61 self._last_size = None
63 self._config_data = None
64 self._inst_ips_by_link = None
65 self._ip_to_inst_by_link = None
66 self._instances_ips = None
67 self._mc_primary_ips = None
68 self._nodes_primary_ips = None
70 # we need a forced reload at class init time, to initialize _last_*
71 self._Load(force=True)
73 def _Load(self, force=False):
74 """Loads (or reloads) the config file.
77 @param force: whether to force the reload without checking the mtime
79 @return: boolean value that says whether we reloaded the configuration or
80 not (because we decided it was already up-to-date)
84 cfg_stat = os.stat(self._file_name)
85 except EnvironmentError, err:
86 raise errors.ConfigurationError("Cannot stat config file %s: %s" %
87 (self._file_name, err))
88 inode = cfg_stat.st_ino
89 mtime = cfg_stat.st_mtime
90 size = cfg_stat.st_size
92 if (force or inode != self._last_inode or
93 mtime > self._last_mtime or
94 size != self._last_size):
95 self._last_inode = inode
96 self._last_mtime = mtime
97 self._last_size = size
103 self._config_data = serializer.Load(utils.ReadFile(self._file_name))
104 except EnvironmentError, err:
105 raise errors.ConfigurationError("Cannot read config file %s: %s" %
106 (self._file_name, err))
107 except ValueError, err:
108 raise errors.ConfigurationError("Cannot load config file %s: %s" %
109 (self._file_name, err))
111 self._ip_to_inst_by_link = {}
112 self._instances_ips = []
113 self._inst_ips_by_link = {}
114 c_nparams = self._config_data['cluster']['nicparams'][constants.PP_DEFAULT]
115 for iname in self._config_data['instances']:
116 instance = self._config_data['instances'][iname]
117 for nic in instance['nics']:
118 if 'ip' in nic and nic['ip']:
119 params = objects.FillDict(c_nparams, nic['nicparams'])
120 if not params['link'] in self._inst_ips_by_link:
121 self._inst_ips_by_link[params['link']] = []
122 self._ip_to_inst_by_link[params['link']] = {}
123 self._ip_to_inst_by_link[params['link']][nic['ip']] = iname
124 self._inst_ips_by_link[params['link']].append(nic['ip'])
126 self._nodes_primary_ips = []
127 self._mc_primary_ips = []
128 for node_name in self._config_data["nodes"]:
129 node = self._config_data["nodes"][node_name]
130 self._nodes_primary_ips.append(node["primary_ip"])
131 if node["master_candidate"]:
132 self._mc_primary_ips.append(node["primary_ip"])
136 # Clients can request a reload of the config file, so we export our internal
137 # _Load function as Reload.
140 def GetClusterName(self):
141 return self._config_data["cluster"]["cluster_name"]
143 def GetHostKey(self):
144 return self._config_data["cluster"]["rsahostkeypub"]
146 def GetMasterNode(self):
147 return self._config_data["cluster"]["master_node"]
149 def GetMasterIP(self):
150 return self._config_data["cluster"]["master_ip"]
152 def GetMasterNetdev(self):
153 return self._config_data["cluster"]["master_netdev"]
155 def GetFileStorageDir(self):
156 return self._config_data["cluster"]["file_storage_dir"]
158 def GetNodeList(self):
159 return self._config_data["nodes"].keys()
161 def GetConfigSerialNo(self):
162 return self._config_data["serial_no"]
164 def GetClusterSerialNo(self):
165 return self._config_data["cluster"]["serial_no"]
167 def GetDefaultNicParams(self):
168 return self._config_data["cluster"]["nicparams"][constants.PP_DEFAULT]
170 def GetDefaultNicLink(self):
171 return self.GetDefaultNicParams()[constants.NIC_LINK]
173 def GetNodeStatusFlags(self, node):
174 """Get a node's status flags
177 @param node: node name
178 @rtype: (bool, bool, bool)
179 @return: (master_candidate, drained, offline) (or None if no such node)
182 if node not in self._config_data["nodes"]:
185 master_candidate = self._config_data["nodes"][node]["master_candidate"]
186 drained = self._config_data["nodes"][node]["drained"]
187 offline = self._config_data["nodes"][node]["offline"]
188 return master_candidate, drained, offline
190 def GetInstanceByLinkIp(self, ip, link):
191 """Get instance name from its link and ip address.
194 @param ip: ip address
196 @param link: nic link
198 @return: instance name
202 link = self.GetDefaultNicLink()
203 if not link in self._ip_to_inst_by_link:
205 if not ip in self._ip_to_inst_by_link[link]:
207 return self._ip_to_inst_by_link[link][ip]
209 def GetNodePrimaryIp(self, node):
210 """Get a node's primary ip
213 @param node: node name
214 @rtype: string, or None
215 @return: node's primary ip, or None if no such node
218 if node not in self._config_data["nodes"]:
220 return self._config_data["nodes"][node]["primary_ip"]
222 def GetInstancePrimaryNode(self, instance):
223 """Get an instance's primary node
225 @type instance: string
226 @param instance: instance name
227 @rtype: string, or None
228 @return: primary node, or None if no such instance
231 if instance not in self._config_data["instances"]:
233 return self._config_data["instances"][instance]["primary_node"]
235 def GetNodesPrimaryIps(self):
236 return self._nodes_primary_ips
238 def GetMasterCandidatesPrimaryIps(self):
239 return self._mc_primary_ips
241 def GetInstancesIps(self, link):
242 """Get list of nic ips connected to a certain link.
245 @param link: nic link
247 @return: list of ips connected to that link
251 link = self.GetDefaultNicLink()
253 if link in self._inst_ips_by_link:
254 return self._inst_ips_by_link[link]
259 class SimpleStore(object):
260 """Interface to static cluster data.
262 This is different that the config.ConfigWriter and
263 SimpleConfigReader classes in that it holds data that will always be
264 present, even on nodes which don't have all the cluster data.
266 Other particularities of the datastore:
267 - keys are restricted to predefined values
270 _SS_FILEPREFIX = "ssconf_"
272 constants.SS_CLUSTER_NAME,
273 constants.SS_CLUSTER_TAGS,
274 constants.SS_FILE_STORAGE_DIR,
275 constants.SS_MASTER_CANDIDATES,
276 constants.SS_MASTER_CANDIDATES_IPS,
277 constants.SS_MASTER_IP,
278 constants.SS_MASTER_NETDEV,
279 constants.SS_MASTER_NODE,
280 constants.SS_NODE_LIST,
281 constants.SS_NODE_PRIMARY_IPS,
282 constants.SS_NODE_SECONDARY_IPS,
283 constants.SS_OFFLINE_NODES,
284 constants.SS_ONLINE_NODES,
285 constants.SS_PRIMARY_IP_FAMILY,
286 constants.SS_INSTANCE_LIST,
287 constants.SS_RELEASE_VERSION,
288 constants.SS_HYPERVISOR_LIST,
289 constants.SS_MAINTAIN_NODE_HEALTH,
290 constants.SS_UID_POOL,
294 def __init__(self, cfg_location=None):
295 if cfg_location is None:
296 self._cfg_dir = constants.DATA_DIR
298 self._cfg_dir = cfg_location
300 def KeyToFilename(self, key):
301 """Convert a given key into filename.
304 if key not in self._VALID_KEYS:
305 raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'"
308 filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key
311 def _ReadFile(self, key, default=None):
312 """Generic routine to read keys.
314 This will read the file which holds the value requested. Errors
315 will be changed into ConfigurationErrors.
318 filename = self.KeyToFilename(key)
320 data = utils.ReadFile(filename, size=self._MAX_SIZE)
321 except EnvironmentError, err:
322 if err.errno == errno.ENOENT and default is not None:
324 raise errors.ConfigurationError("Can't read from the ssconf file:"
326 data = data.rstrip('\n')
329 def WriteFiles(self, values):
330 """Writes ssconf files used by external scripts.
333 @param values: Dictionary of (name, value)
336 ssconf_lock = utils.FileLock.Open(constants.SSCONF_LOCK_FILE)
338 # Get lock while writing files
339 ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
341 for name, value in values.iteritems():
342 if value and not value.endswith("\n"):
344 if len(value) > self._MAX_SIZE:
345 raise errors.ConfigurationError("ssconf file %s above maximum size" %
347 utils.WriteFile(self.KeyToFilename(name), data=value, mode=0444)
351 def GetFileList(self):
352 """Return the list of all config files.
354 This is used for computing node replication data.
357 return [self.KeyToFilename(key) for key in self._VALID_KEYS]
359 def GetClusterName(self):
360 """Get the cluster name.
363 return self._ReadFile(constants.SS_CLUSTER_NAME)
365 def GetFileStorageDir(self):
366 """Get the file storage dir.
369 return self._ReadFile(constants.SS_FILE_STORAGE_DIR)
371 def GetMasterCandidates(self):
372 """Return the list of master candidates.
375 data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
376 nl = data.splitlines(False)
379 def GetMasterCandidatesIPList(self):
380 """Return the list of master candidates' primary IP.
383 data = self._ReadFile(constants.SS_MASTER_CANDIDATES_IPS)
384 nl = data.splitlines(False)
387 def GetMasterIP(self):
388 """Get the IP of the master node for this cluster.
391 return self._ReadFile(constants.SS_MASTER_IP)
393 def GetMasterNetdev(self):
394 """Get the netdev to which we'll add the master ip.
397 return self._ReadFile(constants.SS_MASTER_NETDEV)
399 def GetMasterNode(self):
400 """Get the hostname of the master node for this cluster.
403 return self._ReadFile(constants.SS_MASTER_NODE)
405 def GetNodeList(self):
406 """Return the list of cluster nodes.
409 data = self._ReadFile(constants.SS_NODE_LIST)
410 nl = data.splitlines(False)
413 def GetNodePrimaryIPList(self):
414 """Return the list of cluster nodes' primary IP.
417 data = self._ReadFile(constants.SS_NODE_PRIMARY_IPS)
418 nl = data.splitlines(False)
421 def GetNodeSecondaryIPList(self):
422 """Return the list of cluster nodes' secondary IP.
425 data = self._ReadFile(constants.SS_NODE_SECONDARY_IPS)
426 nl = data.splitlines(False)
429 def GetClusterTags(self):
430 """Return the cluster tags.
433 data = self._ReadFile(constants.SS_CLUSTER_TAGS)
434 nl = data.splitlines(False)
437 def GetHypervisorList(self):
438 """Return the list of enabled hypervisors.
441 data = self._ReadFile(constants.SS_HYPERVISOR_LIST)
442 nl = data.splitlines(False)
445 def GetMaintainNodeHealth(self):
446 """Return the value of the maintain_node_health option.
449 data = self._ReadFile(constants.SS_MAINTAIN_NODE_HEALTH)
450 # we rely on the bool serialization here
451 return data == "True"
453 def GetUidPool(self):
454 """Return the user-id pool definition string.
456 The separator character is a newline.
458 The return value can be parsed using uidpool.ParseUidPool()::
460 ss = ssconf.SimpleStore()
461 uid_pool = uidpool.ParseUidPool(ss.GetUidPool(), separator="\\n")
464 data = self._ReadFile(constants.SS_UID_POOL)
467 def GetPrimaryIPFamily(self):
468 """Return the cluster-wide primary address family.
472 return int(self._ReadFile(constants.SS_PRIMARY_IP_FAMILY,
473 default=netutils.IP4Address.family))
474 except (ValueError, TypeError), err:
475 raise errors.ConfigurationError("Error while trying to parse primary ip"
479 def GetMasterAndMyself(ss=None):
480 """Get the master node and my own hostname.
482 This can be either used for a 'soft' check (compared to CheckMaster,
483 which exits) or just for computing both at the same time.
485 The function does not handle any errors, these should be handled in
486 the caller (errors.ConfigurationError, errors.ResolverError).
488 @param ss: either a sstore.SimpleConfigReader or a
489 sstore.SimpleStore instance
491 @return: a tuple (master node name, my own name)
496 return ss.GetMasterNode(), netutils.Hostname.GetSysName()
499 def CheckMaster(debug, ss=None):
500 """Checks the node setup.
502 If this is the master, the function will return. Otherwise it will
503 exit with an exit code based on the node status.
507 master_name, myself = GetMasterAndMyself(ss)
508 except errors.ConfigurationError, err:
509 print "Cluster configuration incomplete: '%s'" % str(err)
510 sys.exit(constants.EXIT_NODESETUP_ERROR)
511 except errors.ResolverError, err:
512 sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
513 sys.exit(constants.EXIT_NODESETUP_ERROR)
515 if myself != master_name:
517 sys.stderr.write("Not master, exiting.\n")
518 sys.exit(constants.EXIT_NOTMASTER)