root / lib / ssconf.py @ e4376078
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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 | a8083063 | Iustin Pop | |
31 | a8083063 | Iustin Pop | from ganeti import errors |
32 | a8083063 | Iustin Pop | from ganeti import constants |
33 | 41a57aab | Michael Hanselmann | from ganeti import utils |
34 | 856c67e1 | Michael Hanselmann | from ganeti import serializer |
35 | a8083063 | Iustin Pop | |
36 | a8083063 | Iustin Pop | |
37 | 0c223ea9 | Michael Hanselmann | SSCONF_LOCK_TIMEOUT = 10
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38 | 0c223ea9 | Michael Hanselmann | |
39 | 0c223ea9 | Michael Hanselmann | |
40 | 02f99608 | Oleksiy Mishchenko | class SimpleConfigReader(object): |
41 | 856c67e1 | Michael Hanselmann | """Simple class to read configuration file.
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42 | 856c67e1 | Michael Hanselmann |
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43 | 856c67e1 | Michael Hanselmann | """
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44 | 856c67e1 | Michael Hanselmann | def __init__(self, file_name=constants.CLUSTER_CONF_FILE): |
45 | 856c67e1 | Michael Hanselmann | """Initializes this class.
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46 | 856c67e1 | Michael Hanselmann |
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47 | 856c67e1 | Michael Hanselmann | @type file_name: string
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48 | 856c67e1 | Michael Hanselmann | @param file_name: Configuration file path
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49 | 856c67e1 | Michael Hanselmann |
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50 | 856c67e1 | Michael Hanselmann | """
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51 | 856c67e1 | Michael Hanselmann | self._file_name = file_name
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52 | 856c67e1 | Michael Hanselmann | self._config_data = serializer.Load(utils.ReadFile(file_name))
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53 | 856c67e1 | Michael Hanselmann | # TODO: Error handling
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54 | 856c67e1 | Michael Hanselmann | |
55 | 856c67e1 | Michael Hanselmann | def GetClusterName(self): |
56 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["cluster_name"] |
57 | 856c67e1 | Michael Hanselmann | |
58 | 856c67e1 | Michael Hanselmann | def GetHostKey(self): |
59 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["rsahostkeypub"] |
60 | 856c67e1 | Michael Hanselmann | |
61 | 856c67e1 | Michael Hanselmann | def GetMasterNode(self): |
62 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["master_node"] |
63 | 856c67e1 | Michael Hanselmann | |
64 | 856c67e1 | Michael Hanselmann | def GetMasterIP(self): |
65 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["master_ip"] |
66 | 856c67e1 | Michael Hanselmann | |
67 | 856c67e1 | Michael Hanselmann | def GetMasterNetdev(self): |
68 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["master_netdev"] |
69 | 856c67e1 | Michael Hanselmann | |
70 | 856c67e1 | Michael Hanselmann | def GetFileStorageDir(self): |
71 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["file_storage_dir"] |
72 | 856c67e1 | Michael Hanselmann | |
73 | 856c67e1 | Michael Hanselmann | def GetHypervisorType(self): |
74 | 856c67e1 | Michael Hanselmann | return self._config_data["cluster"]["hypervisor"] |
75 | 856c67e1 | Michael Hanselmann | |
76 | 856c67e1 | Michael Hanselmann | def GetNodeList(self): |
77 | 856c67e1 | Michael Hanselmann | return self._config_data["nodes"].keys() |
78 | 856c67e1 | Michael Hanselmann | |
79 | 02f99608 | Oleksiy Mishchenko | @classmethod
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80 | 02f99608 | Oleksiy Mishchenko | def FromDict(cls, val, cfg_file=constants.CLUSTER_CONF_FILE): |
81 | 02f99608 | Oleksiy Mishchenko | """Alternative construction from a dictionary.
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82 | 02f99608 | Oleksiy Mishchenko |
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83 | 02f99608 | Oleksiy Mishchenko | """
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84 | 02f99608 | Oleksiy Mishchenko | obj = SimpleConfigReader.__new__(cls) |
85 | 02f99608 | Oleksiy Mishchenko | obj._config_data = val |
86 | 02f99608 | Oleksiy Mishchenko | obj._file_name = cfg_file |
87 | 02f99608 | Oleksiy Mishchenko | return obj
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88 | 02f99608 | Oleksiy Mishchenko | |
89 | 856c67e1 | Michael Hanselmann | |
90 | 856c67e1 | Michael Hanselmann | class SimpleConfigWriter(SimpleConfigReader): |
91 | 856c67e1 | Michael Hanselmann | """Simple class to write configuration file.
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92 | 856c67e1 | Michael Hanselmann |
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93 | 856c67e1 | Michael Hanselmann | """
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94 | 856c67e1 | Michael Hanselmann | def SetMasterNode(self, node): |
95 | 856c67e1 | Michael Hanselmann | """Change master node.
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96 | 856c67e1 | Michael Hanselmann |
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97 | 856c67e1 | Michael Hanselmann | """
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98 | 856c67e1 | Michael Hanselmann | self._config_data["cluster"]["master_node"] = node |
99 | 856c67e1 | Michael Hanselmann | |
100 | 856c67e1 | Michael Hanselmann | def Save(self): |
101 | 856c67e1 | Michael Hanselmann | """Writes configuration file.
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102 | 856c67e1 | Michael Hanselmann |
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103 | 856c67e1 | Michael Hanselmann | Warning: Doesn't take care of locking or synchronizing with other
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104 | 856c67e1 | Michael Hanselmann | processes.
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105 | 856c67e1 | Michael Hanselmann |
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106 | 856c67e1 | Michael Hanselmann | """
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107 | 856c67e1 | Michael Hanselmann | utils.WriteFile(self._file_name,
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108 | 856c67e1 | Michael Hanselmann | data=serializer.Dump(self._config_data),
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109 | 856c67e1 | Michael Hanselmann | mode=0600)
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110 | 856c67e1 | Michael Hanselmann | |
111 | 856c67e1 | Michael Hanselmann | |
112 | 0c223ea9 | Michael Hanselmann | def _SsconfPath(name): |
113 | 0c223ea9 | Michael Hanselmann | return "%s/ssconf_%s" % (constants.DATA_DIR, name) |
114 | 0c223ea9 | Michael Hanselmann | |
115 | 0c223ea9 | Michael Hanselmann | |
116 | 0c223ea9 | Michael Hanselmann | def WriteSsconfFiles(file_name): |
117 | 0c223ea9 | Michael Hanselmann | """Writes legacy ssconf files to be used by external scripts.
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118 | 0c223ea9 | Michael Hanselmann |
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119 | 0c223ea9 | Michael Hanselmann | @type file_name: string
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120 | 0c223ea9 | Michael Hanselmann | @param file_name: Path to configuration file
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121 | 0c223ea9 | Michael Hanselmann |
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122 | 0c223ea9 | Michael Hanselmann | """
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123 | 0c223ea9 | Michael Hanselmann | ssconf_lock = utils.FileLock(constants.SSCONF_LOCK_FILE) |
124 | 0c223ea9 | Michael Hanselmann | |
125 | 0c223ea9 | Michael Hanselmann | # Read config
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126 | 0c223ea9 | Michael Hanselmann | cfg = SimpleConfigReader(file_name=file_name) |
127 | 0c223ea9 | Michael Hanselmann | |
128 | 0c223ea9 | Michael Hanselmann | # Get lock while writing files
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129 | 0c223ea9 | Michael Hanselmann | ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
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130 | 0c223ea9 | Michael Hanselmann | try:
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131 | 0c223ea9 | Michael Hanselmann | utils.WriteFile(_SsconfPath("cluster_name"),
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132 | 0c223ea9 | Michael Hanselmann | data="%s\n" % cfg.GetClusterName())
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133 | 0c223ea9 | Michael Hanselmann | |
134 | 0c223ea9 | Michael Hanselmann | utils.WriteFile(_SsconfPath("master_ip"),
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135 | 0c223ea9 | Michael Hanselmann | data="%s\n" % cfg.GetMasterIP())
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136 | 0c223ea9 | Michael Hanselmann | |
137 | 0c223ea9 | Michael Hanselmann | utils.WriteFile(_SsconfPath("master_netdev"),
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138 | 0c223ea9 | Michael Hanselmann | data="%s\n" % cfg.GetMasterNetdev())
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139 | 0c223ea9 | Michael Hanselmann | |
140 | 0c223ea9 | Michael Hanselmann | utils.WriteFile(_SsconfPath("master_node"),
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141 | 0c223ea9 | Michael Hanselmann | data="%s\n" % cfg.GetMasterNode())
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142 | 0c223ea9 | Michael Hanselmann | finally:
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143 | 0c223ea9 | Michael Hanselmann | ssconf_lock.Unlock() |
144 | 0c223ea9 | Michael Hanselmann | |
145 | 0c223ea9 | Michael Hanselmann | |
146 | b33e986b | Iustin Pop | def GetMasterAndMyself(ss=None): |
147 | b33e986b | Iustin Pop | """Get the master node and my own hostname.
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148 | b33e986b | Iustin Pop |
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149 | b33e986b | Iustin Pop | This can be either used for a 'soft' check (compared to CheckMaster,
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150 | b33e986b | Iustin Pop | which exits) or just for computing both at the same time.
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151 | b33e986b | Iustin Pop |
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152 | b33e986b | Iustin Pop | The function does not handle any errors, these should be handled in
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153 | b33e986b | Iustin Pop | the caller (errors.ConfigurationError, errors.ResolverError).
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154 | b33e986b | Iustin Pop |
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155 | b33e986b | Iustin Pop | """
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156 | b33e986b | Iustin Pop | if ss is None: |
157 | 06dc5b44 | Iustin Pop | ss = SimpleConfigReader() |
158 | b33e986b | Iustin Pop | return ss.GetMasterNode(), utils.HostInfo().name
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159 | b33e986b | Iustin Pop | |
160 | 06dc5b44 | Iustin Pop | |
161 | b33e986b | Iustin Pop | def CheckMaster(debug, ss=None): |
162 | 5675cd1f | Iustin Pop | """Checks the node setup.
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163 | 5675cd1f | Iustin Pop |
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164 | 5675cd1f | Iustin Pop | If this is the master, the function will return. Otherwise it will
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165 | 5675cd1f | Iustin Pop | exit with an exit code based on the node status.
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166 | 5675cd1f | Iustin Pop |
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167 | 5675cd1f | Iustin Pop | """
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168 | 5675cd1f | Iustin Pop | try:
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169 | b33e986b | Iustin Pop | master_name, myself = GetMasterAndMyself(ss) |
170 | 5675cd1f | Iustin Pop | except errors.ConfigurationError, err:
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171 | 5675cd1f | Iustin Pop | print "Cluster configuration incomplete: '%s'" % str(err) |
172 | 5675cd1f | Iustin Pop | sys.exit(constants.EXIT_NODESETUP_ERROR) |
173 | 5675cd1f | Iustin Pop | except errors.ResolverError, err:
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174 | 5675cd1f | Iustin Pop | sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0]) |
175 | 5675cd1f | Iustin Pop | sys.exit(constants.EXIT_NODESETUP_ERROR) |
176 | 5675cd1f | Iustin Pop | |
177 | b33e986b | Iustin Pop | if myself != master_name:
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178 | 5675cd1f | Iustin Pop | if debug:
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179 | 5675cd1f | Iustin Pop | sys.stderr.write("Not master, exiting.\n")
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180 | 5675cd1f | Iustin Pop | sys.exit(constants.EXIT_NOTMASTER) |