root / lib / ssconf.py @ 8113a52e
History | View | Annotate | Download (7.8 kB)
1 |
#
|
---|---|
2 |
#
|
3 |
|
4 |
# Copyright (C) 2006, 2007, 2008 Google Inc.
|
5 |
#
|
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.
|
10 |
#
|
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.
|
15 |
#
|
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
|
19 |
# 02110-1301, USA.
|
20 |
|
21 |
|
22 |
"""Global Configuration data for Ganeti.
|
23 |
|
24 |
This module provides the interface to a special case of cluster
|
25 |
configuration data, which is mostly static and available to all nodes.
|
26 |
|
27 |
"""
|
28 |
|
29 |
import sys |
30 |
import re |
31 |
|
32 |
from ganeti import errors |
33 |
from ganeti import constants |
34 |
from ganeti import utils |
35 |
from ganeti import serializer |
36 |
|
37 |
|
38 |
SSCONF_LOCK_TIMEOUT = 10
|
39 |
|
40 |
RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$')
|
41 |
|
42 |
|
43 |
class SimpleConfigReader(object): |
44 |
"""Simple class to read configuration file.
|
45 |
|
46 |
"""
|
47 |
def __init__(self, file_name=constants.CLUSTER_CONF_FILE): |
48 |
"""Initializes this class.
|
49 |
|
50 |
@type file_name: string
|
51 |
@param file_name: Configuration file path
|
52 |
|
53 |
"""
|
54 |
self._file_name = file_name
|
55 |
self._config_data = serializer.Load(utils.ReadFile(file_name))
|
56 |
# TODO: Error handling
|
57 |
|
58 |
def GetClusterName(self): |
59 |
return self._config_data["cluster"]["cluster_name"] |
60 |
|
61 |
def GetHostKey(self): |
62 |
return self._config_data["cluster"]["rsahostkeypub"] |
63 |
|
64 |
def GetMasterNode(self): |
65 |
return self._config_data["cluster"]["master_node"] |
66 |
|
67 |
def GetMasterIP(self): |
68 |
return self._config_data["cluster"]["master_ip"] |
69 |
|
70 |
def GetMasterNetdev(self): |
71 |
return self._config_data["cluster"]["master_netdev"] |
72 |
|
73 |
def GetFileStorageDir(self): |
74 |
return self._config_data["cluster"]["file_storage_dir"] |
75 |
|
76 |
def GetHypervisorType(self): |
77 |
return self._config_data["cluster"]["hypervisor"] |
78 |
|
79 |
def GetNodeList(self): |
80 |
return self._config_data["nodes"].keys() |
81 |
|
82 |
|
83 |
class SimpleStore(object): |
84 |
"""Interface to static cluster data.
|
85 |
|
86 |
This is different that the config.ConfigWriter and
|
87 |
SimpleConfigReader classes in that it holds data that will always be
|
88 |
present, even on nodes which don't have all the cluster data.
|
89 |
|
90 |
Other particularities of the datastore:
|
91 |
- keys are restricted to predefined values
|
92 |
|
93 |
"""
|
94 |
_SS_FILEPREFIX = "ssconf_"
|
95 |
_VALID_KEYS = ( |
96 |
constants.SS_CLUSTER_NAME, |
97 |
constants.SS_CLUSTER_TAGS, |
98 |
constants.SS_FILE_STORAGE_DIR, |
99 |
constants.SS_MASTER_CANDIDATES, |
100 |
constants.SS_MASTER_CANDIDATES_IPS, |
101 |
constants.SS_MASTER_IP, |
102 |
constants.SS_MASTER_NETDEV, |
103 |
constants.SS_MASTER_NODE, |
104 |
constants.SS_NODE_LIST, |
105 |
constants.SS_NODE_PRIMARY_IPS, |
106 |
constants.SS_NODE_SECONDARY_IPS, |
107 |
constants.SS_OFFLINE_NODES, |
108 |
constants.SS_ONLINE_NODES, |
109 |
constants.SS_INSTANCE_LIST, |
110 |
constants.SS_RELEASE_VERSION, |
111 |
) |
112 |
_MAX_SIZE = 131072
|
113 |
|
114 |
def __init__(self, cfg_location=None): |
115 |
if cfg_location is None: |
116 |
self._cfg_dir = constants.DATA_DIR
|
117 |
else:
|
118 |
self._cfg_dir = cfg_location
|
119 |
|
120 |
def KeyToFilename(self, key): |
121 |
"""Convert a given key into filename.
|
122 |
|
123 |
"""
|
124 |
if key not in self._VALID_KEYS: |
125 |
raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'" |
126 |
% str(key))
|
127 |
|
128 |
filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key |
129 |
return filename
|
130 |
|
131 |
def _ReadFile(self, key): |
132 |
"""Generic routine to read keys.
|
133 |
|
134 |
This will read the file which holds the value requested. Errors
|
135 |
will be changed into ConfigurationErrors.
|
136 |
|
137 |
"""
|
138 |
filename = self.KeyToFilename(key)
|
139 |
try:
|
140 |
data = utils.ReadFile(filename, size=self._MAX_SIZE)
|
141 |
except EnvironmentError, err: |
142 |
raise errors.ConfigurationError("Can't read from the ssconf file:" |
143 |
" '%s'" % str(err)) |
144 |
data = data.rstrip('\n')
|
145 |
return data
|
146 |
|
147 |
def WriteFiles(self, values): |
148 |
"""Writes ssconf files used by external scripts.
|
149 |
|
150 |
@type values: dict
|
151 |
@param values: Dictionary of (name, value)
|
152 |
|
153 |
"""
|
154 |
ssconf_lock = utils.FileLock(constants.SSCONF_LOCK_FILE) |
155 |
|
156 |
# Get lock while writing files
|
157 |
ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT)
|
158 |
try:
|
159 |
for name, value in values.iteritems(): |
160 |
if value and not value.endswith("\n"): |
161 |
value += "\n"
|
162 |
utils.WriteFile(self.KeyToFilename(name), data=value, mode=0444) |
163 |
finally:
|
164 |
ssconf_lock.Unlock() |
165 |
|
166 |
def GetFileList(self): |
167 |
"""Return the list of all config files.
|
168 |
|
169 |
This is used for computing node replication data.
|
170 |
|
171 |
"""
|
172 |
return [self.KeyToFilename(key) for key in self._VALID_KEYS] |
173 |
|
174 |
def GetClusterName(self): |
175 |
"""Get the cluster name.
|
176 |
|
177 |
"""
|
178 |
return self._ReadFile(constants.SS_CLUSTER_NAME) |
179 |
|
180 |
def GetFileStorageDir(self): |
181 |
"""Get the file storage dir.
|
182 |
|
183 |
"""
|
184 |
return self._ReadFile(constants.SS_FILE_STORAGE_DIR) |
185 |
|
186 |
def GetMasterCandidates(self): |
187 |
"""Return the list of master candidates.
|
188 |
|
189 |
"""
|
190 |
data = self._ReadFile(constants.SS_MASTER_CANDIDATES)
|
191 |
nl = data.splitlines(False)
|
192 |
return nl
|
193 |
|
194 |
def GetMasterCandidatesIPList(self): |
195 |
"""Return the list of master candidates' primary IP.
|
196 |
|
197 |
"""
|
198 |
data = self._ReadFile(constants.SS_MASTER_CANDIDATES_IPS)
|
199 |
nl = data.splitlines(False)
|
200 |
return nl
|
201 |
|
202 |
def GetMasterIP(self): |
203 |
"""Get the IP of the master node for this cluster.
|
204 |
|
205 |
"""
|
206 |
return self._ReadFile(constants.SS_MASTER_IP) |
207 |
|
208 |
def GetMasterNetdev(self): |
209 |
"""Get the netdev to which we'll add the master ip.
|
210 |
|
211 |
"""
|
212 |
return self._ReadFile(constants.SS_MASTER_NETDEV) |
213 |
|
214 |
def GetMasterNode(self): |
215 |
"""Get the hostname of the master node for this cluster.
|
216 |
|
217 |
"""
|
218 |
return self._ReadFile(constants.SS_MASTER_NODE) |
219 |
|
220 |
def GetNodeList(self): |
221 |
"""Return the list of cluster nodes.
|
222 |
|
223 |
"""
|
224 |
data = self._ReadFile(constants.SS_NODE_LIST)
|
225 |
nl = data.splitlines(False)
|
226 |
return nl
|
227 |
|
228 |
def GetNodePrimaryIPList(self): |
229 |
"""Return the list of cluster nodes' primary IP.
|
230 |
|
231 |
"""
|
232 |
data = self._ReadFile(constants.SS_NODE_PRIMARY_IPS)
|
233 |
nl = data.splitlines(False)
|
234 |
return nl
|
235 |
|
236 |
def GetNodeSecondaryIPList(self): |
237 |
"""Return the list of cluster nodes' secondary IP.
|
238 |
|
239 |
"""
|
240 |
data = self._ReadFile(constants.SS_NODE_SECONDARY_IPS)
|
241 |
nl = data.splitlines(False)
|
242 |
return nl
|
243 |
|
244 |
def GetClusterTags(self): |
245 |
"""Return the cluster tags.
|
246 |
|
247 |
"""
|
248 |
data = self._ReadFile(constants.SS_CLUSTER_TAGS)
|
249 |
nl = data.splitlines(False)
|
250 |
return nl
|
251 |
|
252 |
|
253 |
def GetMasterAndMyself(ss=None): |
254 |
"""Get the master node and my own hostname.
|
255 |
|
256 |
This can be either used for a 'soft' check (compared to CheckMaster,
|
257 |
which exits) or just for computing both at the same time.
|
258 |
|
259 |
The function does not handle any errors, these should be handled in
|
260 |
the caller (errors.ConfigurationError, errors.ResolverError).
|
261 |
|
262 |
@param ss: either a sstore.SimpleConfigReader or a
|
263 |
sstore.SimpleStore instance
|
264 |
@rtype: tuple
|
265 |
@return: a tuple (master node name, my own name)
|
266 |
|
267 |
"""
|
268 |
if ss is None: |
269 |
ss = SimpleStore() |
270 |
return ss.GetMasterNode(), utils.HostInfo().name
|
271 |
|
272 |
|
273 |
def CheckMaster(debug, ss=None): |
274 |
"""Checks the node setup.
|
275 |
|
276 |
If this is the master, the function will return. Otherwise it will
|
277 |
exit with an exit code based on the node status.
|
278 |
|
279 |
"""
|
280 |
try:
|
281 |
master_name, myself = GetMasterAndMyself(ss) |
282 |
except errors.ConfigurationError, err:
|
283 |
print "Cluster configuration incomplete: '%s'" % str(err) |
284 |
sys.exit(constants.EXIT_NODESETUP_ERROR) |
285 |
except errors.ResolverError, err:
|
286 |
sys.stderr.write("Cannot resolve my own name (%s)\n" % err.args[0]) |
287 |
sys.exit(constants.EXIT_NODESETUP_ERROR) |
288 |
|
289 |
if myself != master_name:
|
290 |
if debug:
|
291 |
sys.stderr.write("Not master, exiting.\n")
|
292 |
sys.exit(constants.EXIT_NOTMASTER) |