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.
32 from ganeti import errors
33 from ganeti import constants
34 from ganeti import utils
35 from ganeti import serializer
38 SSCONF_LOCK_TIMEOUT = 10
40 RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$')
43 class SimpleConfigReader(object):
44 """Simple class to read configuration file.
47 def __init__(self, file_name=constants.CLUSTER_CONF_FILE):
48 """Initializes this class.
50 @type file_name: string
51 @param file_name: Configuration file path
54 self._file_name = file_name
55 self._config_data = serializer.Load(utils.ReadFile(file_name))
56 # TODO: Error handling
58 def GetClusterName(self):
59 return self._config_data["cluster"]["cluster_name"]
62 return self._config_data["cluster"]["rsahostkeypub"]
64 def GetMasterNode(self):
65 return self._config_data["cluster"]["master_node"]
67 def GetMasterIP(self):
68 return self._config_data["cluster"]["master_ip"]
70 def GetMasterNetdev(self):
71 return self._config_data["cluster"]["master_netdev"]
73 def GetFileStorageDir(self):
74 return self._config_data["cluster"]["file_storage_dir"]
76 def GetHypervisorType(self):
77 return self._config_data["cluster"]["hypervisor"]
79 def GetNodeList(self):
80 return self._config_data["nodes"].keys()
83 def FromDict(cls, val, cfg_file=constants.CLUSTER_CONF_FILE):
84 """Alternative construction from a dictionary.
87 obj = SimpleConfigReader.__new__(cls)
88 obj._config_data = val
89 obj._file_name = cfg_file
93 class SimpleConfigWriter(SimpleConfigReader):
94 """Simple class to write configuration file.
97 def SetMasterNode(self, node):
98 """Change master node.
101 self._config_data["cluster"]["master_node"] = node
104 """Writes configuration file.
106 Warning: Doesn't take care of locking or synchronizing with other
110 utils.WriteFile(self._file_name,
111 data=serializer.Dump(self._config_data),
115 class SimpleStore(object):
116 """Interface to static cluster data.
118 This is different that the config.ConfigWriter and
119 SimpleConfigReader classes in that it holds data that will always be
120 present, even on nodes which don't have all the cluster data.
122 Other particularities of the datastore:
123 - keys are restricted to predefined values
126 _SS_FILEPREFIX = "ssconf_"
128 constants.SS_CLUSTER_NAME,
129 constants.SS_FILE_STORAGE_DIR,
130 constants.SS_MASTER_CANDIDATES,
131 constants.SS_MASTER_IP,
132 constants.SS_MASTER_NETDEV,
133 constants.SS_MASTER_NODE,
134 constants.SS_NODE_LIST,
138 def __init__(self, cfg_location=None):
139 if cfg_location is None:
140 self._cfg_dir = constants.DATA_DIR
142 self._cfg_dir = cfg_location
144 def KeyToFilename(self, key):
145 """Convert a given key into filename.
148 if key not in self._VALID_KEYS:
149 raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'"
152 filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key
155 def _ReadFile(self, key):
156 """Generic routine to read keys.
158 This will read the file which holds the value requested. Errors
159 will be changed into ConfigurationErrors.
162 filename = self.KeyToFilename(key)
164 fh = file(filename, 'r')
166 data = fh.read(self._MAX_SIZE)
167 data = data.rstrip('\n')
170 except EnvironmentError, err:
171 raise errors.ConfigurationError("Can't read from the ssconf file:"
175 def WriteFiles(self, values):
176 """Writes ssconf files used by external scripts.
179 @param values: Dictionary of (name, value)
182 ssconf_lock = utils.FileLock(constants.SSCONF_LOCK_FILE)
184 # Get lock while writing files
185 ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
187 for name, value in values.iteritems():
188 if not value.endswith("\n"):
190 utils.WriteFile(self.KeyToFilename(name), data=value)
194 def GetFileList(self):
195 """Return the list of all config files.
197 This is used for computing node replication data.
200 return [self.KeyToFilename(key) for key in self._VALID_KEYS]
202 def GetClusterName(self):
203 """Get the cluster name.
206 return self._ReadFile(constants.SS_CLUSTER_NAME)
208 def GetFileStorageDir(self):
209 """Get the file storage dir.
212 return self._ReadFile(constants.SS_FILE_STORAGE_DIR)
214 def GetMasterCandidates(self):
215 """Return the list of master candidates.
218 data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
219 nl = data.splitlines(False)
222 def GetMasterIP(self):
223 """Get the IP of the master node for this cluster.
226 return self._ReadFile(constants.SS_MASTER_IP)
228 def GetMasterNetdev(self):
229 """Get the netdev to which we'll add the master ip.
232 return self._ReadFile(constants.SS_MASTER_NETDEV)
234 def GetMasterNode(self):
235 """Get the hostname of the master node for this cluster.
238 return self._ReadFile(constants.SS_MASTER_NODE)
240 def GetNodeList(self):
241 """Return the list of cluster nodes.
244 data = self._ReadFile(constants.SS_NODE_LIST)
245 nl = data.splitlines(False)
249 def GetMasterAndMyself(ss=None):
250 """Get the master node and my own hostname.
252 This can be either used for a 'soft' check (compared to CheckMaster,
253 which exits) or just for computing both at the same time.
255 The function does not handle any errors, these should be handled in
256 the caller (errors.ConfigurationError, errors.ResolverError).
258 @param ss: either a sstore.SimpleConfigReader or a
259 sstore.SimpleStore instance
261 @return: a tuple (master node name, my own name)
266 return ss.GetMasterNode(), utils.HostInfo().name
269 def CheckMaster(debug, ss=None):
270 """Checks the node setup.
272 If this is the master, the function will return. Otherwise it will
273 exit with an exit code based on the node status.
277 master_name, myself = GetMasterAndMyself(ss)
278 except errors.ConfigurationError, err:
279 print "Cluster configuration incomplete: '%s'" % str(err)
280 sys.exit(constants.EXIT_NODESETUP_ERROR)
281 except errors.ResolverError, err:
282 sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0])
283 sys.exit(constants.EXIT_NODESETUP_ERROR)
285 if myself != master_name:
287 sys.stderr.write("Not master, exiting.\n")
288 sys.exit(constants.EXIT_NOTMASTER)