root / lib / ssconf.py @ 742f39ac
History | View | Annotate | Download (5.6 kB)
1 | 2f31098c | Iustin Pop | #
|
---|---|---|---|
2 | a8083063 | Iustin Pop | #
|
3 | a8083063 | Iustin Pop | |
4 | a8083063 | Iustin Pop | # Copyright (C) 2006, 2007 Google Inc.
|
5 | a8083063 | Iustin Pop | #
|
6 | a8083063 | Iustin Pop | # This program is free software; you can redistribute it and/or modify
|
7 | a8083063 | Iustin Pop | # it under the terms of the GNU General Public License as published by
|
8 | a8083063 | Iustin Pop | # the Free Software Foundation; either version 2 of the License, or
|
9 | a8083063 | Iustin Pop | # (at your option) any later version.
|
10 | a8083063 | Iustin Pop | #
|
11 | a8083063 | Iustin Pop | # This program is distributed in the hope that it will be useful, but
|
12 | a8083063 | Iustin Pop | # WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 | a8083063 | Iustin Pop | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 | a8083063 | Iustin Pop | # General Public License for more details.
|
15 | a8083063 | Iustin Pop | #
|
16 | a8083063 | Iustin Pop | # You should have received a copy of the GNU General Public License
|
17 | a8083063 | Iustin Pop | # along with this program; if not, write to the Free Software
|
18 | a8083063 | Iustin Pop | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 | a8083063 | Iustin Pop | # 02110-1301, USA.
|
20 | a8083063 | Iustin Pop | |
21 | a8083063 | Iustin Pop | |
22 | a8083063 | Iustin Pop | """Global Configuration data for Ganeti.
|
23 | a8083063 | Iustin Pop |
|
24 | a8083063 | Iustin Pop | This module provides the interface to a special case of cluster
|
25 | a8083063 | Iustin Pop | configuration data, which is mostly static and available to all nodes.
|
26 | a8083063 | Iustin Pop |
|
27 | a8083063 | Iustin Pop | """
|
28 | a8083063 | Iustin Pop | |
29 | a8083063 | Iustin Pop | import socket |
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 | a8083063 | Iustin Pop | |
35 | a8083063 | Iustin Pop | |
36 | a8083063 | Iustin Pop | class SimpleStore: |
37 | a8083063 | Iustin Pop | """Interface to static cluster data.
|
38 | a8083063 | Iustin Pop |
|
39 | a8083063 | Iustin Pop | This is different that the config.ConfigWriter class in that it
|
40 | a8083063 | Iustin Pop | holds data that is (mostly) constant after the cluster
|
41 | a8083063 | Iustin Pop | initialization. Its purpose is to allow limited customization of
|
42 | a8083063 | Iustin Pop | things which would otherwise normally live in constants.py. Note
|
43 | a8083063 | Iustin Pop | that this data cannot live in ConfigWriter as that is available only
|
44 | a8083063 | Iustin Pop | on the master node, and our data must be readable by both the master
|
45 | a8083063 | Iustin Pop | and the nodes.
|
46 | a8083063 | Iustin Pop |
|
47 | a8083063 | Iustin Pop | Other particularities of the datastore:
|
48 | a8083063 | Iustin Pop | - keys are restricted to predefined values
|
49 | a8083063 | Iustin Pop | - values are small (<4k)
|
50 | a8083063 | Iustin Pop | - since the data is practically static, read keys are cached in memory
|
51 | a8083063 | Iustin Pop | - some keys are handled specially (read from the system, so
|
52 | a8083063 | Iustin Pop | we can't update them)
|
53 | a8083063 | Iustin Pop |
|
54 | a8083063 | Iustin Pop | """
|
55 | a8083063 | Iustin Pop | _SS_FILEPREFIX = "ssconf_"
|
56 | a8083063 | Iustin Pop | SS_HYPERVISOR = "hypervisor"
|
57 | a8083063 | Iustin Pop | SS_NODED_PASS = "node_pass"
|
58 | 880478f8 | Iustin Pop | SS_MASTER_NODE = "master_node"
|
59 | 880478f8 | Iustin Pop | SS_MASTER_IP = "master_ip"
|
60 | 880478f8 | Iustin Pop | SS_MASTER_NETDEV = "master_netdev"
|
61 | 5fcdc80d | Iustin Pop | SS_CLUSTER_NAME = "cluster_name"
|
62 | 17dfc522 | Manuel Franceschini | SS_FILE_STORAGE_DIR = "file_storage_dir"
|
63 | 742f39ac | Michael Hanselmann | SS_CONFIG_VERSION = "config_version"
|
64 | 880478f8 | Iustin Pop | _VALID_KEYS = (SS_HYPERVISOR, SS_NODED_PASS, SS_MASTER_NODE, SS_MASTER_IP, |
65 | 742f39ac | Michael Hanselmann | SS_MASTER_NETDEV, SS_CLUSTER_NAME, SS_FILE_STORAGE_DIR, |
66 | 742f39ac | Michael Hanselmann | SS_CONFIG_VERSION) |
67 | a8083063 | Iustin Pop | _MAX_SIZE = 4096
|
68 | a8083063 | Iustin Pop | |
69 | a8083063 | Iustin Pop | def __init__(self, cfg_location=None): |
70 | a8083063 | Iustin Pop | if cfg_location is None: |
71 | a8083063 | Iustin Pop | self._cfg_dir = constants.DATA_DIR
|
72 | a8083063 | Iustin Pop | else:
|
73 | a8083063 | Iustin Pop | self._cfg_dir = cfg_location
|
74 | a8083063 | Iustin Pop | self._cache = {}
|
75 | a8083063 | Iustin Pop | |
76 | a8083063 | Iustin Pop | def KeyToFilename(self, key): |
77 | a8083063 | Iustin Pop | """Convert a given key into filename.
|
78 | a8083063 | Iustin Pop |
|
79 | a8083063 | Iustin Pop | """
|
80 | a8083063 | Iustin Pop | if key not in self._VALID_KEYS: |
81 | 3ecf6786 | Iustin Pop | raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'" |
82 | 3ecf6786 | Iustin Pop | % str(key))
|
83 | a8083063 | Iustin Pop | |
84 | a8083063 | Iustin Pop | filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key |
85 | a8083063 | Iustin Pop | return filename
|
86 | a8083063 | Iustin Pop | |
87 | a8083063 | Iustin Pop | def _ReadFile(self, key): |
88 | a8083063 | Iustin Pop | """Generic routine to read keys.
|
89 | a8083063 | Iustin Pop |
|
90 | a8083063 | Iustin Pop | This will read the file which holds the value requested. Errors
|
91 | a8083063 | Iustin Pop | will be changed into ConfigurationErrors.
|
92 | a8083063 | Iustin Pop |
|
93 | a8083063 | Iustin Pop | """
|
94 | a8083063 | Iustin Pop | if key in self._cache: |
95 | a8083063 | Iustin Pop | return self._cache[key] |
96 | a8083063 | Iustin Pop | filename = self.KeyToFilename(key)
|
97 | a8083063 | Iustin Pop | try:
|
98 | a8083063 | Iustin Pop | fh = file(filename, 'r') |
99 | a8083063 | Iustin Pop | try:
|
100 | a8083063 | Iustin Pop | data = fh.readline(self._MAX_SIZE)
|
101 | a8083063 | Iustin Pop | data = data.rstrip('\n')
|
102 | a8083063 | Iustin Pop | finally:
|
103 | a8083063 | Iustin Pop | fh.close() |
104 | a8083063 | Iustin Pop | except EnvironmentError, err: |
105 | 3ecf6786 | Iustin Pop | raise errors.ConfigurationError("Can't read from the ssconf file:" |
106 | 3ecf6786 | Iustin Pop | " '%s'" % str(err)) |
107 | a8083063 | Iustin Pop | self._cache[key] = data
|
108 | a8083063 | Iustin Pop | return data
|
109 | a8083063 | Iustin Pop | |
110 | a8083063 | Iustin Pop | def GetNodeDaemonPort(self): |
111 | a8083063 | Iustin Pop | """Get the node daemon port for this cluster.
|
112 | a8083063 | Iustin Pop |
|
113 | a8083063 | Iustin Pop | Note that this routine does not read a ganeti-specific file, but
|
114 | a8083063 | Iustin Pop | instead uses socket.getservbyname to allow pre-customization of
|
115 | a8083063 | Iustin Pop | this parameter outside of ganeti.
|
116 | a8083063 | Iustin Pop |
|
117 | a8083063 | Iustin Pop | """
|
118 | a8083063 | Iustin Pop | try:
|
119 | a8083063 | Iustin Pop | port = socket.getservbyname("ganeti-noded", "tcp") |
120 | a8083063 | Iustin Pop | except socket.error:
|
121 | a8083063 | Iustin Pop | port = constants.DEFAULT_NODED_PORT |
122 | a8083063 | Iustin Pop | |
123 | a8083063 | Iustin Pop | return port
|
124 | a8083063 | Iustin Pop | |
125 | a8083063 | Iustin Pop | def GetHypervisorType(self): |
126 | a8083063 | Iustin Pop | """Get the hypervisor type for this cluster.
|
127 | a8083063 | Iustin Pop |
|
128 | a8083063 | Iustin Pop | """
|
129 | a8083063 | Iustin Pop | return self._ReadFile(self.SS_HYPERVISOR) |
130 | a8083063 | Iustin Pop | |
131 | a8083063 | Iustin Pop | def GetNodeDaemonPassword(self): |
132 | a8083063 | Iustin Pop | """Get the node password for this cluster.
|
133 | a8083063 | Iustin Pop |
|
134 | a8083063 | Iustin Pop | """
|
135 | a8083063 | Iustin Pop | return self._ReadFile(self.SS_NODED_PASS) |
136 | a8083063 | Iustin Pop | |
137 | 880478f8 | Iustin Pop | def GetMasterNode(self): |
138 | 880478f8 | Iustin Pop | """Get the hostname of the master node for this cluster.
|
139 | 880478f8 | Iustin Pop |
|
140 | 880478f8 | Iustin Pop | """
|
141 | 880478f8 | Iustin Pop | return self._ReadFile(self.SS_MASTER_NODE) |
142 | 880478f8 | Iustin Pop | |
143 | 880478f8 | Iustin Pop | def GetMasterIP(self): |
144 | 880478f8 | Iustin Pop | """Get the IP of the master node for this cluster.
|
145 | 880478f8 | Iustin Pop |
|
146 | 880478f8 | Iustin Pop | """
|
147 | 880478f8 | Iustin Pop | return self._ReadFile(self.SS_MASTER_IP) |
148 | 880478f8 | Iustin Pop | |
149 | 880478f8 | Iustin Pop | def GetMasterNetdev(self): |
150 | 880478f8 | Iustin Pop | """Get the netdev to which we'll add the master ip.
|
151 | 880478f8 | Iustin Pop |
|
152 | 880478f8 | Iustin Pop | """
|
153 | 880478f8 | Iustin Pop | return self._ReadFile(self.SS_MASTER_NETDEV) |
154 | 880478f8 | Iustin Pop | |
155 | 5fcdc80d | Iustin Pop | def GetClusterName(self): |
156 | 5fcdc80d | Iustin Pop | """Get the cluster name.
|
157 | 5fcdc80d | Iustin Pop |
|
158 | 5fcdc80d | Iustin Pop | """
|
159 | 5fcdc80d | Iustin Pop | return self._ReadFile(self.SS_CLUSTER_NAME) |
160 | 5fcdc80d | Iustin Pop | |
161 | 17dfc522 | Manuel Franceschini | def GetFileStorageDir(self): |
162 | 17dfc522 | Manuel Franceschini | """Get the file storage dir.
|
163 | 17dfc522 | Manuel Franceschini |
|
164 | 17dfc522 | Manuel Franceschini | """
|
165 | 17dfc522 | Manuel Franceschini | return self._ReadFile(self.SS_FILE_STORAGE_DIR) |
166 | 17dfc522 | Manuel Franceschini | |
167 | 742f39ac | Michael Hanselmann | def GetConfigVersion(self): |
168 | 742f39ac | Michael Hanselmann | """Get the configuration version.
|
169 | 742f39ac | Michael Hanselmann |
|
170 | 742f39ac | Michael Hanselmann | """
|
171 | 742f39ac | Michael Hanselmann | value = self._ReadFile(self.SS_CONFIG_VERSION) |
172 | 742f39ac | Michael Hanselmann | try:
|
173 | 742f39ac | Michael Hanselmann | return int(value) |
174 | 742f39ac | Michael Hanselmann | except (ValueError, TypeError), err: |
175 | 742f39ac | Michael Hanselmann | raise errors.ConfigurationError("Failed to convert config version %s to" |
176 | 742f39ac | Michael Hanselmann | " int: '%s'" % (value, str(err))) |
177 | 742f39ac | Michael Hanselmann | |
178 | a8083063 | Iustin Pop | def SetKey(self, key, value): |
179 | a8083063 | Iustin Pop | """Set the value of a key.
|
180 | a8083063 | Iustin Pop |
|
181 | a8083063 | Iustin Pop | This should be used only when adding a node to a cluster.
|
182 | a8083063 | Iustin Pop |
|
183 | a8083063 | Iustin Pop | """
|
184 | a8083063 | Iustin Pop | file_name = self.KeyToFilename(key)
|
185 | 41a57aab | Michael Hanselmann | utils.WriteFile(file_name, data="%s\n" % str(value), |
186 | 41a57aab | Michael Hanselmann | uid=0, gid=0, mode=0400) |
187 | 41a57aab | Michael Hanselmann | self._cache[key] = value
|
188 | a8083063 | Iustin Pop | |
189 | a8083063 | Iustin Pop | def GetFileList(self): |
190 | 742f39ac | Michael Hanselmann | """Return the list of all config files.
|
191 | a8083063 | Iustin Pop |
|
192 | a8083063 | Iustin Pop | This is used for computing node replication data.
|
193 | a8083063 | Iustin Pop |
|
194 | a8083063 | Iustin Pop | """
|
195 | a8083063 | Iustin Pop | return [self.KeyToFilename(key) for key in self._VALID_KEYS] |