root / lib / ssconf.py @ 531baf8e
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2 | a8083063 | Iustin Pop | #
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3 | a8083063 | Iustin Pop | |
4 | 856c67e1 | Michael Hanselmann | # Copyright (C) 2006, 2007, 2008 Google Inc.
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5 | a8083063 | Iustin Pop | #
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6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
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7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
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8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
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9 | a8083063 | Iustin Pop | # (at your option) any later version.
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10 | a8083063 | Iustin Pop | #
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11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
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12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | a8083063 | Iustin Pop | # General Public License for more details.
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15 | a8083063 | Iustin Pop | #
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16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
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17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
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18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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19 | a8083063 | Iustin Pop | # 02110-1301, USA.
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20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Global Configuration data for Ganeti.
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23 | a8083063 | Iustin Pop |
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24 | a8083063 | Iustin Pop | This module provides the interface to a special case of cluster
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25 | a8083063 | Iustin Pop | configuration data, which is mostly static and available to all nodes.
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26 | a8083063 | Iustin Pop |
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27 | a8083063 | Iustin Pop | """
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28 | a8083063 | Iustin Pop | |
29 | 5675cd1f | Iustin Pop | import sys |
30 | 03d1dba2 | Michael Hanselmann | import re |
31 | a8083063 | Iustin Pop | |
32 | a8083063 | Iustin Pop | from ganeti import errors |
33 | a8083063 | Iustin Pop | from ganeti import constants |
34 | 41a57aab | Michael Hanselmann | from ganeti import utils |
35 | 856c67e1 | Michael Hanselmann | from ganeti import serializer |
36 | a8083063 | Iustin Pop | |
37 | a8083063 | Iustin Pop | |
38 | 0c223ea9 | Michael Hanselmann | SSCONF_LOCK_TIMEOUT = 10
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39 | 0c223ea9 | Michael Hanselmann | |
40 | 03d1dba2 | Michael Hanselmann | RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$')
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41 | 03d1dba2 | Michael Hanselmann | |
42 | 0c223ea9 | Michael Hanselmann | |
43 | 02f99608 | Oleksiy Mishchenko | class SimpleConfigReader(object): |
44 | 856c67e1 | Michael Hanselmann | """Simple class to read configuration file.
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45 | 856c67e1 | Michael Hanselmann |
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46 | 856c67e1 | Michael Hanselmann | """
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47 | 856c67e1 | Michael Hanselmann | def __init__(self, file_name=constants.CLUSTER_CONF_FILE): |
48 | 856c67e1 | Michael Hanselmann | """Initializes this class.
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49 | 856c67e1 | Michael Hanselmann |
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50 | 856c67e1 | Michael Hanselmann | @type file_name: string
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51 | 856c67e1 | Michael Hanselmann | @param file_name: Configuration file path
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52 | 856c67e1 | Michael Hanselmann |
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53 | 856c67e1 | Michael Hanselmann | """
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54 | 856c67e1 | Michael Hanselmann | self._file_name = file_name
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55 | 856c67e1 | Michael Hanselmann | self._config_data = serializer.Load(utils.ReadFile(file_name))
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56 | 856c67e1 | Michael Hanselmann | # TODO: Error handling
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57 | 856c67e1 | Michael Hanselmann | |
58 | 856c67e1 | Michael Hanselmann | def GetClusterName(self): |
59 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["cluster_name"] |
60 | 856c67e1 | Michael Hanselmann | |
61 | 856c67e1 | Michael Hanselmann | def GetHostKey(self): |
62 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["rsahostkeypub"] |
63 | 856c67e1 | Michael Hanselmann | |
64 | 856c67e1 | Michael Hanselmann | def GetMasterNode(self): |
65 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["master_node"] |
66 | 856c67e1 | Michael Hanselmann | |
67 | 856c67e1 | Michael Hanselmann | def GetMasterIP(self): |
68 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["master_ip"] |
69 | 856c67e1 | Michael Hanselmann | |
70 | 856c67e1 | Michael Hanselmann | def GetMasterNetdev(self): |
71 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["master_netdev"] |
72 | 856c67e1 | Michael Hanselmann | |
73 | 856c67e1 | Michael Hanselmann | def GetFileStorageDir(self): |
74 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["file_storage_dir"] |
75 | 856c67e1 | Michael Hanselmann | |
76 | 856c67e1 | Michael Hanselmann | def GetHypervisorType(self): |
77 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["hypervisor"] |
78 | 856c67e1 | Michael Hanselmann | |
79 | 856c67e1 | Michael Hanselmann | def GetNodeList(self): |
80 | 856c67e1 | Michael Hanselmann | return self._config_data["nodes"].keys() |
81 | 856c67e1 | Michael Hanselmann | |
82 | 02f99608 | Oleksiy Mishchenko | @classmethod
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83 | 02f99608 | Oleksiy Mishchenko | def FromDict(cls, val, cfg_file=constants.CLUSTER_CONF_FILE): |
84 | 02f99608 | Oleksiy Mishchenko | """Alternative construction from a dictionary.
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85 | 02f99608 | Oleksiy Mishchenko |
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86 | 02f99608 | Oleksiy Mishchenko | """
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87 | 02f99608 | Oleksiy Mishchenko | obj = SimpleConfigReader.__new__(cls) |
88 | 02f99608 | Oleksiy Mishchenko | obj._config_data = val |
89 | 02f99608 | Oleksiy Mishchenko | obj._file_name = cfg_file |
90 | 02f99608 | Oleksiy Mishchenko | return obj
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91 | 02f99608 | Oleksiy Mishchenko | |
92 | 856c67e1 | Michael Hanselmann | |
93 | 856c67e1 | Michael Hanselmann | class SimpleConfigWriter(SimpleConfigReader): |
94 | 856c67e1 | Michael Hanselmann | """Simple class to write configuration file.
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95 | 856c67e1 | Michael Hanselmann |
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96 | 856c67e1 | Michael Hanselmann | """
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97 | 856c67e1 | Michael Hanselmann | def SetMasterNode(self, node): |
98 | 856c67e1 | Michael Hanselmann | """Change master node.
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99 | 856c67e1 | Michael Hanselmann |
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100 | 856c67e1 | Michael Hanselmann | """
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101 | 856c67e1 | Michael Hanselmann | self._config_data["cluster"]["master_node"] = node |
102 | 856c67e1 | Michael Hanselmann | |
103 | 856c67e1 | Michael Hanselmann | def Save(self): |
104 | 856c67e1 | Michael Hanselmann | """Writes configuration file.
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105 | 856c67e1 | Michael Hanselmann |
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106 | 856c67e1 | Michael Hanselmann | Warning: Doesn't take care of locking or synchronizing with other
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107 | 856c67e1 | Michael Hanselmann | processes.
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108 | 856c67e1 | Michael Hanselmann |
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109 | 856c67e1 | Michael Hanselmann | """
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110 | 856c67e1 | Michael Hanselmann | utils.WriteFile(self._file_name,
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111 | 856c67e1 | Michael Hanselmann | data=serializer.Dump(self._config_data),
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112 | 856c67e1 | Michael Hanselmann | mode=0600)
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113 | 856c67e1 | Michael Hanselmann | |
114 | 856c67e1 | Michael Hanselmann | |
115 | 93384844 | Iustin Pop | class SimpleStore(object): |
116 | 93384844 | Iustin Pop | """Interface to static cluster data.
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117 | 93384844 | Iustin Pop |
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118 | 93384844 | Iustin Pop | This is different that the config.ConfigWriter and
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119 | 93384844 | Iustin Pop | SimpleConfigReader classes in that it holds data that will always be
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120 | 93384844 | Iustin Pop | present, even on nodes which don't have all the cluster data.
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121 | 93384844 | Iustin Pop |
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122 | 93384844 | Iustin Pop | Other particularities of the datastore:
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123 | 93384844 | Iustin Pop | - keys are restricted to predefined values
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124 | 93384844 | Iustin Pop |
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125 | 93384844 | Iustin Pop | """
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126 | 93384844 | Iustin Pop | _SS_FILEPREFIX = "ssconf_"
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127 | 93384844 | Iustin Pop | _VALID_KEYS = ( |
128 | 93384844 | Iustin Pop | constants.SS_CLUSTER_NAME, |
129 | 93384844 | Iustin Pop | constants.SS_FILE_STORAGE_DIR, |
130 | f56618e0 | Iustin Pop | constants.SS_MASTER_CANDIDATES, |
131 | 93384844 | Iustin Pop | constants.SS_MASTER_IP, |
132 | 93384844 | Iustin Pop | constants.SS_MASTER_NETDEV, |
133 | 93384844 | Iustin Pop | constants.SS_MASTER_NODE, |
134 | 93384844 | Iustin Pop | constants.SS_NODE_LIST, |
135 | a3316e4a | Iustin Pop | constants.SS_OFFLINE_NODES, |
136 | 93384844 | Iustin Pop | ) |
137 | 93384844 | Iustin Pop | _MAX_SIZE = 131072
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138 | 93384844 | Iustin Pop | |
139 | 93384844 | Iustin Pop | def __init__(self, cfg_location=None): |
140 | 93384844 | Iustin Pop | if cfg_location is None: |
141 | 93384844 | Iustin Pop | self._cfg_dir = constants.DATA_DIR
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142 | 93384844 | Iustin Pop | else:
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143 | 93384844 | Iustin Pop | self._cfg_dir = cfg_location
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144 | 93384844 | Iustin Pop | |
145 | 93384844 | Iustin Pop | def KeyToFilename(self, key): |
146 | 93384844 | Iustin Pop | """Convert a given key into filename.
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147 | 93384844 | Iustin Pop |
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148 | 93384844 | Iustin Pop | """
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149 | 93384844 | Iustin Pop | if key not in self._VALID_KEYS: |
150 | 93384844 | Iustin Pop | raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'" |
151 | 93384844 | Iustin Pop | % str(key))
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152 | 93384844 | Iustin Pop | |
153 | 93384844 | Iustin Pop | filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key |
154 | 93384844 | Iustin Pop | return filename
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155 | 93384844 | Iustin Pop | |
156 | 93384844 | Iustin Pop | def _ReadFile(self, key): |
157 | 93384844 | Iustin Pop | """Generic routine to read keys.
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158 | 93384844 | Iustin Pop |
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159 | 93384844 | Iustin Pop | This will read the file which holds the value requested. Errors
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160 | 93384844 | Iustin Pop | will be changed into ConfigurationErrors.
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161 | 93384844 | Iustin Pop |
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162 | 93384844 | Iustin Pop | """
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163 | 93384844 | Iustin Pop | filename = self.KeyToFilename(key)
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164 | 93384844 | Iustin Pop | try:
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165 | 93384844 | Iustin Pop | fh = file(filename, 'r') |
166 | 93384844 | Iustin Pop | try:
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167 | 93384844 | Iustin Pop | data = fh.read(self._MAX_SIZE)
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168 | 93384844 | Iustin Pop | data = data.rstrip('\n')
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169 | 93384844 | Iustin Pop | finally:
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170 | 93384844 | Iustin Pop | fh.close() |
171 | 93384844 | Iustin Pop | except EnvironmentError, err: |
172 | 93384844 | Iustin Pop | raise errors.ConfigurationError("Can't read from the ssconf file:" |
173 | 93384844 | Iustin Pop | " '%s'" % str(err)) |
174 | 93384844 | Iustin Pop | return data
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175 | 93384844 | Iustin Pop | |
176 | 89b14f05 | Iustin Pop | def WriteFiles(self, values): |
177 | 89b14f05 | Iustin Pop | """Writes ssconf files used by external scripts.
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178 | 89b14f05 | Iustin Pop |
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179 | 89b14f05 | Iustin Pop | @type values: dict
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180 | 89b14f05 | Iustin Pop | @param values: Dictionary of (name, value)
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181 | 89b14f05 | Iustin Pop |
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182 | 89b14f05 | Iustin Pop | """
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183 | 89b14f05 | Iustin Pop | ssconf_lock = utils.FileLock(constants.SSCONF_LOCK_FILE) |
184 | 89b14f05 | Iustin Pop | |
185 | 89b14f05 | Iustin Pop | # Get lock while writing files
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186 | 89b14f05 | Iustin Pop | ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
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187 | 89b14f05 | Iustin Pop | try:
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188 | 89b14f05 | Iustin Pop | for name, value in values.iteritems(): |
189 | 02b31f32 | Iustin Pop | if value and not value.endswith("\n"): |
190 | 89b14f05 | Iustin Pop | value += "\n"
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191 | 89b14f05 | Iustin Pop | utils.WriteFile(self.KeyToFilename(name), data=value)
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192 | 89b14f05 | Iustin Pop | finally:
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193 | 89b14f05 | Iustin Pop | ssconf_lock.Unlock() |
194 | 89b14f05 | Iustin Pop | |
195 | 93384844 | Iustin Pop | def GetFileList(self): |
196 | 93384844 | Iustin Pop | """Return the list of all config files.
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197 | 93384844 | Iustin Pop |
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198 | 93384844 | Iustin Pop | This is used for computing node replication data.
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199 | 93384844 | Iustin Pop |
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200 | 93384844 | Iustin Pop | """
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201 | 93384844 | Iustin Pop | return [self.KeyToFilename(key) for key in self._VALID_KEYS] |
202 | 93384844 | Iustin Pop | |
203 | 93384844 | Iustin Pop | def GetClusterName(self): |
204 | 93384844 | Iustin Pop | """Get the cluster name.
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205 | 93384844 | Iustin Pop |
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206 | 93384844 | Iustin Pop | """
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207 | 93384844 | Iustin Pop | return self._ReadFile(constants.SS_CLUSTER_NAME) |
208 | 93384844 | Iustin Pop | |
209 | 93384844 | Iustin Pop | def GetFileStorageDir(self): |
210 | 93384844 | Iustin Pop | """Get the file storage dir.
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211 | 93384844 | Iustin Pop |
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212 | 93384844 | Iustin Pop | """
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213 | 93384844 | Iustin Pop | return self._ReadFile(constants.SS_FILE_STORAGE_DIR) |
214 | 93384844 | Iustin Pop | |
215 | f56618e0 | Iustin Pop | def GetMasterCandidates(self): |
216 | f56618e0 | Iustin Pop | """Return the list of master candidates.
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217 | f56618e0 | Iustin Pop |
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218 | f56618e0 | Iustin Pop | """
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219 | f56618e0 | Iustin Pop | data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
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220 | f56618e0 | Iustin Pop | nl = data.splitlines(False)
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221 | f56618e0 | Iustin Pop | return nl
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222 | f56618e0 | Iustin Pop | |
223 | 93384844 | Iustin Pop | def GetMasterIP(self): |
224 | 93384844 | Iustin Pop | """Get the IP of the master node for this cluster.
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225 | 93384844 | Iustin Pop |
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226 | 93384844 | Iustin Pop | """
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227 | 93384844 | Iustin Pop | return self._ReadFile(constants.SS_MASTER_IP) |
228 | 93384844 | Iustin Pop | |
229 | 93384844 | Iustin Pop | def GetMasterNetdev(self): |
230 | 93384844 | Iustin Pop | """Get the netdev to which we'll add the master ip.
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231 | 93384844 | Iustin Pop |
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232 | 93384844 | Iustin Pop | """
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233 | 93384844 | Iustin Pop | return self._ReadFile(constants.SS_MASTER_NETDEV) |
234 | 93384844 | Iustin Pop | |
235 | 93384844 | Iustin Pop | def GetMasterNode(self): |
236 | 93384844 | Iustin Pop | """Get the hostname of the master node for this cluster.
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237 | 93384844 | Iustin Pop |
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238 | 93384844 | Iustin Pop | """
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239 | 93384844 | Iustin Pop | return self._ReadFile(constants.SS_MASTER_NODE) |
240 | 93384844 | Iustin Pop | |
241 | 93384844 | Iustin Pop | def GetNodeList(self): |
242 | 93384844 | Iustin Pop | """Return the list of cluster nodes.
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243 | 93384844 | Iustin Pop |
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244 | 93384844 | Iustin Pop | """
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245 | 93384844 | Iustin Pop | data = self._ReadFile(constants.SS_NODE_LIST)
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246 | 93384844 | Iustin Pop | nl = data.splitlines(False)
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247 | 93384844 | Iustin Pop | return nl
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248 | 93384844 | Iustin Pop | |
249 | 93384844 | Iustin Pop | |
250 | b33e986b | Iustin Pop | def GetMasterAndMyself(ss=None): |
251 | b33e986b | Iustin Pop | """Get the master node and my own hostname.
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252 | b33e986b | Iustin Pop |
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253 | b33e986b | Iustin Pop | This can be either used for a 'soft' check (compared to CheckMaster,
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254 | b33e986b | Iustin Pop | which exits) or just for computing both at the same time.
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255 | b33e986b | Iustin Pop |
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256 | b33e986b | Iustin Pop | The function does not handle any errors, these should be handled in
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257 | b33e986b | Iustin Pop | the caller (errors.ConfigurationError, errors.ResolverError).
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258 | b33e986b | Iustin Pop |
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259 | 8135a2db | Iustin Pop | @param ss: either a sstore.SimpleConfigReader or a
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260 | 8135a2db | Iustin Pop | sstore.SimpleStore instance
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261 | 8135a2db | Iustin Pop | @rtype: tuple
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262 | 8135a2db | Iustin Pop | @return: a tuple (master node name, my own name)
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263 | 8135a2db | Iustin Pop |
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264 | b33e986b | Iustin Pop | """
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265 | b33e986b | Iustin Pop | if ss is None: |
266 | 93384844 | Iustin Pop | ss = SimpleStore() |
267 | b33e986b | Iustin Pop | return ss.GetMasterNode(), utils.HostInfo().name
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268 | b33e986b | Iustin Pop | |
269 | 06dc5b44 | Iustin Pop | |
270 | b33e986b | Iustin Pop | def CheckMaster(debug, ss=None): |
271 | 5675cd1f | Iustin Pop | """Checks the node setup.
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272 | 5675cd1f | Iustin Pop |
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273 | 5675cd1f | Iustin Pop | If this is the master, the function will return. Otherwise it will
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274 | 5675cd1f | Iustin Pop | exit with an exit code based on the node status.
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275 | 5675cd1f | Iustin Pop |
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276 | 5675cd1f | Iustin Pop | """
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277 | 5675cd1f | Iustin Pop | try:
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278 | b33e986b | Iustin Pop | master_name, myself = GetMasterAndMyself(ss) |
279 | 5675cd1f | Iustin Pop | except errors.ConfigurationError, err:
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280 | 5675cd1f | Iustin Pop | print "Cluster configuration incomplete: '%s'" % str(err) |
281 | 5675cd1f | Iustin Pop | sys.exit(constants.EXIT_NODESETUP_ERROR) |
282 | 5675cd1f | Iustin Pop | except errors.ResolverError, err:
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283 | 5675cd1f | Iustin Pop | sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0]) |
284 | 5675cd1f | Iustin Pop | sys.exit(constants.EXIT_NODESETUP_ERROR) |
285 | 5675cd1f | Iustin Pop | |
286 | b33e986b | Iustin Pop | if myself != master_name:
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287 | 5675cd1f | Iustin Pop | if debug:
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288 | 5675cd1f | Iustin Pop | sys.stderr.write("Not master, exiting.\n")
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289 | 5675cd1f | Iustin Pop | sys.exit(constants.EXIT_NOTMASTER) |