Revision 9f4bb951
b/.gitignore | ||
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36 | 36 |
/daemons/daemon-util |
37 | 37 |
/daemons/ensure-dirs |
38 | 38 |
/daemons/ganeti-cleaner |
39 |
/daemons/ganeti-watcher |
|
39 | 40 |
|
40 | 41 |
# devel |
41 | 42 |
/devel/clean-cluster |
b/Makefile.am | ||
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23 | 23 |
masterddir = $(pkgpythondir)/masterd |
24 | 24 |
confddir = $(pkgpythondir)/confd |
25 | 25 |
rapidir = $(pkgpythondir)/rapi |
26 |
watcherdir = $(pkgpythondir)/watcher |
|
26 | 27 |
impexpddir = $(pkgpythondir)/impexpd |
27 | 28 |
toolsdir = $(pkglibdir)/tools |
28 | 29 |
docdir = $(datadir)/doc/$(PACKAGE) |
... | ... | |
47 | 48 |
lib/impexpd \ |
48 | 49 |
lib/masterd \ |
49 | 50 |
lib/rapi \ |
51 |
lib/watcher \ |
|
50 | 52 |
man \ |
51 | 53 |
qa \ |
52 | 54 |
test \ |
... | ... | |
188 | 190 |
impexpd_PYTHON = \ |
189 | 191 |
lib/impexpd/__init__.py |
190 | 192 |
|
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watcher_PYTHON = \ |
|
194 |
lib/watcher/__init__.py |
|
195 |
|
|
191 | 196 |
docrst = \ |
192 | 197 |
doc/admin.rst \ |
193 | 198 |
doc/design-2.0.rst \ |
... | ... | |
270 | 275 |
scripts/gnt-os |
271 | 276 |
|
272 | 277 |
PYTHON_BOOTSTRAP = \ |
278 |
daemons/ganeti-watcher \ |
|
273 | 279 |
scripts/gnt-backup \ |
274 | 280 |
scripts/gnt-cluster \ |
275 | 281 |
scripts/gnt-debug \ |
... | ... | |
280 | 286 |
|
281 | 287 |
dist_sbin_SCRIPTS = \ |
282 | 288 |
daemons/ganeti-noded \ |
283 |
daemons/ganeti-watcher \ |
|
284 | 289 |
daemons/ganeti-masterd \ |
285 | 290 |
daemons/ganeti-confd \ |
286 | 291 |
daemons/ganeti-rapi |
... | ... | |
468 | 473 |
$(confd_PYTHON) \ |
469 | 474 |
$(masterd_PYTHON) \ |
470 | 475 |
$(impexpd_PYTHON) \ |
476 |
$(watcher_PYTHON) \ |
|
471 | 477 |
$(noinst_PYTHON) |
472 | 478 |
|
473 | 479 |
srclink_files = \ |
... | ... | |
634 | 640 |
} > $@ |
635 | 641 |
|
636 | 642 |
# Using deferred evaluation |
643 |
daemons/ganeti-watcher: MODULE = ganeti.watcher |
|
637 | 644 |
scripts/%: MODULE = ganeti.client.$(subst -,_,$(notdir $@)) |
638 | 645 |
|
639 | 646 |
$(PYTHON_BOOTSTRAP): Makefile | $(all_dirfiles) |
/dev/null | ||
---|---|---|
1 |
#!/usr/bin/python |
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2 |
# |
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|
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# Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, but |
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# WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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# General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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# 02110-1301, USA. |
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|
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|
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"""Tool to restart erroneously downed virtual machines. |
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|
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This program and set of classes implement a watchdog to restart |
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virtual machines in a Ganeti cluster that have crashed or been killed |
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by a node reboot. Run from cron or similar. |
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|
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""" |
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|
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# pylint: disable-msg=C0103,W0142 |
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|
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# C0103: Invalid name ganeti-watcher |
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|
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import os |
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import sys |
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import time |
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import logging |
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from optparse import OptionParser |
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|
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from ganeti import utils |
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from ganeti import constants |
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from ganeti import serializer |
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from ganeti import errors |
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from ganeti import opcodes |
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from ganeti import cli |
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from ganeti import luxi |
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from ganeti import ssconf |
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from ganeti import bdev |
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from ganeti import hypervisor |
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from ganeti import rapi |
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from ganeti.confd import client as confd_client |
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from ganeti import netutils |
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|
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import ganeti.rapi.client # pylint: disable-msg=W0611 |
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|
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56 |
|
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MAXTRIES = 5 |
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# Delete any record that is older than 8 hours; this value is based on |
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# the fact that the current retry counter is 5, and watcher runs every |
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# 5 minutes, so it takes around half an hour to exceed the retry |
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# counter, so 8 hours (16*1/2h) seems like a reasonable reset time |
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RETRY_EXPIRATION = 8 * 3600 |
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63 |
BAD_STATES = ['ERROR_down'] |
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HELPLESS_STATES = ['ERROR_nodedown', 'ERROR_nodeoffline'] |
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65 |
NOTICE = 'NOTICE' |
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ERROR = 'ERROR' |
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KEY_RESTART_COUNT = "restart_count" |
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KEY_RESTART_WHEN = "restart_when" |
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KEY_BOOT_ID = "bootid" |
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|
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|
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# Global client object |
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client = None |
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|
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|
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class NotMasterError(errors.GenericError): |
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"""Exception raised when this host is not the master.""" |
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78 |
|
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79 |
|
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def ShouldPause(): |
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"""Check whether we should pause. |
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|
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""" |
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return bool(utils.ReadWatcherPauseFile(constants.WATCHER_PAUSEFILE)) |
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85 |
|
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86 |
|
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def StartNodeDaemons(): |
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"""Start all the daemons that should be running on all nodes. |
|
89 |
|
|
90 |
""" |
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# on master or not, try to start the node daemon |
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utils.EnsureDaemon(constants.NODED) |
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# start confd as well. On non candidates it will be in disabled mode. |
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utils.EnsureDaemon(constants.CONFD) |
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95 |
|
|
96 |
|
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97 |
def RunWatcherHooks(): |
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98 |
"""Run the watcher hooks. |
|
99 |
|
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100 |
""" |
|
101 |
hooks_dir = utils.PathJoin(constants.HOOKS_BASE_DIR, |
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102 |
constants.HOOKS_NAME_WATCHER) |
|
103 |
if not os.path.isdir(hooks_dir): |
|
104 |
return |
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105 |
|
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106 |
try: |
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results = utils.RunParts(hooks_dir) |
|
108 |
except Exception, msg: # pylint: disable-msg=W0703 |
|
109 |
logging.critical("RunParts %s failed: %s", hooks_dir, msg) |
|
110 |
|
|
111 |
for (relname, status, runresult) in results: |
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112 |
if status == constants.RUNPARTS_SKIP: |
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113 |
logging.debug("Watcher hook %s: skipped", relname) |
|
114 |
elif status == constants.RUNPARTS_ERR: |
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logging.warning("Watcher hook %s: error (%s)", relname, runresult) |
|
116 |
elif status == constants.RUNPARTS_RUN: |
|
117 |
if runresult.failed: |
|
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logging.warning("Watcher hook %s: failed (exit: %d) (output: %s)", |
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relname, runresult.exit_code, runresult.output) |
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120 |
else: |
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logging.debug("Watcher hook %s: success (output: %s)", relname, |
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runresult.output) |
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123 |
|
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124 |
|
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125 |
class NodeMaintenance(object): |
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"""Talks to confd daemons and possible shutdown instances/drbd devices. |
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127 |
|
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""" |
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129 |
def __init__(self): |
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130 |
self.store_cb = confd_client.StoreResultCallback() |
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131 |
self.filter_cb = confd_client.ConfdFilterCallback(self.store_cb) |
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132 |
self.confd_client = confd_client.GetConfdClient(self.filter_cb) |
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133 |
|
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134 |
@staticmethod |
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135 |
def ShouldRun(): |
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"""Checks whether node maintenance should run. |
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137 |
|
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138 |
""" |
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139 |
try: |
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140 |
return ssconf.SimpleStore().GetMaintainNodeHealth() |
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141 |
except errors.ConfigurationError, err: |
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142 |
logging.error("Configuration error, not activating node maintenance: %s", |
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err) |
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return False |
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145 |
|
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146 |
@staticmethod |
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147 |
def GetRunningInstances(): |
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"""Compute list of hypervisor/running instances. |
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149 |
|
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150 |
""" |
|
151 |
hyp_list = ssconf.SimpleStore().GetHypervisorList() |
|
152 |
results = [] |
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153 |
for hv_name in hyp_list: |
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154 |
try: |
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155 |
hv = hypervisor.GetHypervisor(hv_name) |
|
156 |
ilist = hv.ListInstances() |
|
157 |
results.extend([(iname, hv_name) for iname in ilist]) |
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158 |
except: # pylint: disable-msg=W0702 |
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159 |
logging.error("Error while listing instances for hypervisor %s", |
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160 |
hv_name, exc_info=True) |
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161 |
return results |
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162 |
|
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@staticmethod |
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164 |
def GetUsedDRBDs(): |
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"""Get list of used DRBD minors. |
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166 |
|
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""" |
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return bdev.DRBD8.GetUsedDevs().keys() |
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169 |
|
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170 |
@classmethod |
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171 |
def DoMaintenance(cls, role): |
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"""Maintain the instance list. |
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173 |
|
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""" |
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if role == constants.CONFD_NODE_ROLE_OFFLINE: |
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inst_running = cls.GetRunningInstances() |
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cls.ShutdownInstances(inst_running) |
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drbd_running = cls.GetUsedDRBDs() |
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cls.ShutdownDRBD(drbd_running) |
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180 |
else: |
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logging.debug("Not doing anything for role %s", role) |
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182 |
|
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183 |
@staticmethod |
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184 |
def ShutdownInstances(inst_running): |
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"""Shutdown running instances. |
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186 |
|
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""" |
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188 |
names_running = set([i[0] for i in inst_running]) |
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189 |
if names_running: |
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190 |
logging.info("Following instances should not be running," |
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" shutting them down: %s", utils.CommaJoin(names_running)) |
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192 |
# this dictionary will collapse duplicate instance names (only |
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# xen pvm/vhm) into a single key, which is fine |
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194 |
i2h = dict(inst_running) |
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195 |
for name in names_running: |
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196 |
hv_name = i2h[name] |
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hv = hypervisor.GetHypervisor(hv_name) |
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hv.StopInstance(None, force=True, name=name) |
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199 |
|
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200 |
@staticmethod |
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201 |
def ShutdownDRBD(drbd_running): |
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202 |
"""Shutdown active DRBD devices. |
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203 |
|
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204 |
""" |
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205 |
if drbd_running: |
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206 |
logging.info("Following DRBD minors should not be active," |
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207 |
" shutting them down: %s", utils.CommaJoin(drbd_running)) |
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208 |
for minor in drbd_running: |
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# pylint: disable-msg=W0212 |
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210 |
# using the private method as is, pending enhancements to the DRBD |
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# interface |
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bdev.DRBD8._ShutdownAll(minor) |
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213 |
|
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def Exec(self): |
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215 |
"""Check node status versus cluster desired state. |
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216 |
|
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217 |
""" |
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218 |
my_name = netutils.Hostname.GetSysName() |
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219 |
req = confd_client.ConfdClientRequest(type= |
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220 |
constants.CONFD_REQ_NODE_ROLE_BYNAME, |
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query=my_name) |
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222 |
self.confd_client.SendRequest(req, async=False, coverage=-1) |
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223 |
timed_out, _, _ = self.confd_client.WaitForReply(req.rsalt) |
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224 |
if not timed_out: |
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# should have a valid response |
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226 |
status, result = self.store_cb.GetResponse(req.rsalt) |
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227 |
assert status, "Missing result but received replies" |
|
228 |
if not self.filter_cb.consistent[req.rsalt]: |
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229 |
logging.warning("Inconsistent replies, not doing anything") |
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230 |
return |
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231 |
self.DoMaintenance(result.server_reply.answer) |
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232 |
else: |
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logging.warning("Confd query timed out, cannot do maintenance actions") |
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234 |
|
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235 |
|
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236 |
class WatcherState(object): |
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237 |
"""Interface to a state file recording restart attempts. |
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238 |
|
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239 |
""" |
|
240 |
def __init__(self, statefile): |
|
241 |
"""Open, lock, read and parse the file. |
|
242 |
|
|
243 |
@type statefile: file |
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244 |
@param statefile: State file object |
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245 |
|
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246 |
""" |
|
247 |
self.statefile = statefile |
|
248 |
|
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249 |
try: |
|
250 |
state_data = self.statefile.read() |
|
251 |
if not state_data: |
|
252 |
self._data = {} |
|
253 |
else: |
|
254 |
self._data = serializer.Load(state_data) |
|
255 |
except Exception, msg: # pylint: disable-msg=W0703 |
|
256 |
# Ignore errors while loading the file and treat it as empty |
|
257 |
self._data = {} |
|
258 |
logging.warning(("Invalid state file. Using defaults." |
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259 |
" Error message: %s"), msg) |
|
260 |
|
|
261 |
if "instance" not in self._data: |
|
262 |
self._data["instance"] = {} |
|
263 |
if "node" not in self._data: |
|
264 |
self._data["node"] = {} |
|
265 |
|
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266 |
self._orig_data = serializer.Dump(self._data) |
|
267 |
|
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268 |
def Save(self): |
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269 |
"""Save state to file, then unlock and close it. |
|
270 |
|
|
271 |
""" |
|
272 |
assert self.statefile |
|
273 |
|
|
274 |
serialized_form = serializer.Dump(self._data) |
|
275 |
if self._orig_data == serialized_form: |
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276 |
logging.debug("Data didn't change, just touching status file") |
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277 |
os.utime(constants.WATCHER_STATEFILE, None) |
|
278 |
return |
|
279 |
|
|
280 |
# We need to make sure the file is locked before renaming it, otherwise |
|
281 |
# starting ganeti-watcher again at the same time will create a conflict. |
|
282 |
fd = utils.WriteFile(constants.WATCHER_STATEFILE, |
|
283 |
data=serialized_form, |
|
284 |
prewrite=utils.LockFile, close=False) |
|
285 |
self.statefile = os.fdopen(fd, 'w+') |
|
286 |
|
|
287 |
def Close(self): |
|
288 |
"""Unlock configuration file and close it. |
|
289 |
|
|
290 |
""" |
|
291 |
assert self.statefile |
|
292 |
|
|
293 |
# Files are automatically unlocked when closing them |
|
294 |
self.statefile.close() |
|
295 |
self.statefile = None |
|
296 |
|
|
297 |
def GetNodeBootID(self, name): |
|
298 |
"""Returns the last boot ID of a node or None. |
|
299 |
|
|
300 |
""" |
|
301 |
ndata = self._data["node"] |
|
302 |
|
|
303 |
if name in ndata and KEY_BOOT_ID in ndata[name]: |
|
304 |
return ndata[name][KEY_BOOT_ID] |
|
305 |
return None |
|
306 |
|
|
307 |
def SetNodeBootID(self, name, bootid): |
|
308 |
"""Sets the boot ID of a node. |
|
309 |
|
|
310 |
""" |
|
311 |
assert bootid |
|
312 |
|
|
313 |
ndata = self._data["node"] |
|
314 |
|
|
315 |
if name not in ndata: |
|
316 |
ndata[name] = {} |
|
317 |
|
|
318 |
ndata[name][KEY_BOOT_ID] = bootid |
|
319 |
|
|
320 |
def NumberOfRestartAttempts(self, instance): |
|
321 |
"""Returns number of previous restart attempts. |
|
322 |
|
|
323 |
@type instance: L{Instance} |
|
324 |
@param instance: the instance to look up |
|
325 |
|
|
326 |
""" |
|
327 |
idata = self._data["instance"] |
|
328 |
|
|
329 |
if instance.name in idata: |
|
330 |
return idata[instance.name][KEY_RESTART_COUNT] |
|
331 |
|
|
332 |
return 0 |
|
333 |
|
|
334 |
def MaintainInstanceList(self, instances): |
|
335 |
"""Perform maintenance on the recorded instances. |
|
336 |
|
|
337 |
@type instances: list of string |
|
338 |
@param instances: the list of currently existing instances |
|
339 |
|
|
340 |
""" |
|
341 |
idict = self._data["instance"] |
|
342 |
# First, delete obsolete instances |
|
343 |
obsolete_instances = set(idict).difference(instances) |
|
344 |
for inst in obsolete_instances: |
|
345 |
logging.debug("Forgetting obsolete instance %s", inst) |
|
346 |
del idict[inst] |
|
347 |
|
|
348 |
# Second, delete expired records |
|
349 |
earliest = time.time() - RETRY_EXPIRATION |
|
350 |
expired_instances = [i for i in idict |
|
351 |
if idict[i][KEY_RESTART_WHEN] < earliest] |
|
352 |
for inst in expired_instances: |
|
353 |
logging.debug("Expiring record for instance %s", inst) |
|
354 |
del idict[inst] |
|
355 |
|
|
356 |
def RecordRestartAttempt(self, instance): |
|
357 |
"""Record a restart attempt. |
|
358 |
|
|
359 |
@type instance: L{Instance} |
|
360 |
@param instance: the instance being restarted |
|
361 |
|
|
362 |
""" |
|
363 |
idata = self._data["instance"] |
|
364 |
|
|
365 |
if instance.name not in idata: |
|
366 |
inst = idata[instance.name] = {} |
|
367 |
else: |
|
368 |
inst = idata[instance.name] |
|
369 |
|
|
370 |
inst[KEY_RESTART_WHEN] = time.time() |
|
371 |
inst[KEY_RESTART_COUNT] = inst.get(KEY_RESTART_COUNT, 0) + 1 |
|
372 |
|
|
373 |
def RemoveInstance(self, instance): |
|
374 |
"""Update state to reflect that a machine is running. |
|
375 |
|
|
376 |
This method removes the record for a named instance (as we only |
|
377 |
track down instances). |
|
378 |
|
|
379 |
@type instance: L{Instance} |
|
380 |
@param instance: the instance to remove from books |
|
381 |
|
|
382 |
""" |
|
383 |
idata = self._data["instance"] |
|
384 |
|
|
385 |
if instance.name in idata: |
|
386 |
del idata[instance.name] |
|
387 |
|
|
388 |
|
|
389 |
class Instance(object): |
|
390 |
"""Abstraction for a Virtual Machine instance. |
|
391 |
|
|
392 |
""" |
|
393 |
def __init__(self, name, state, autostart): |
|
394 |
self.name = name |
|
395 |
self.state = state |
|
396 |
self.autostart = autostart |
|
397 |
|
|
398 |
def Restart(self): |
|
399 |
"""Encapsulates the start of an instance. |
|
400 |
|
|
401 |
""" |
|
402 |
op = opcodes.OpStartupInstance(instance_name=self.name, force=False) |
|
403 |
cli.SubmitOpCode(op, cl=client) |
|
404 |
|
|
405 |
def ActivateDisks(self): |
|
406 |
"""Encapsulates the activation of all disks of an instance. |
|
407 |
|
|
408 |
""" |
|
409 |
op = opcodes.OpActivateInstanceDisks(instance_name=self.name) |
|
410 |
cli.SubmitOpCode(op, cl=client) |
|
411 |
|
|
412 |
|
|
413 |
def GetClusterData(): |
|
414 |
"""Get a list of instances on this cluster. |
|
415 |
|
|
416 |
""" |
|
417 |
op1_fields = ["name", "status", "admin_state", "snodes"] |
|
418 |
op1 = opcodes.OpQueryInstances(output_fields=op1_fields, names=[], |
|
419 |
use_locking=True) |
|
420 |
op2_fields = ["name", "bootid", "offline"] |
|
421 |
op2 = opcodes.OpQueryNodes(output_fields=op2_fields, names=[], |
|
422 |
use_locking=True) |
|
423 |
|
|
424 |
job_id = client.SubmitJob([op1, op2]) |
|
425 |
|
|
426 |
all_results = cli.PollJob(job_id, cl=client, feedback_fn=logging.debug) |
|
427 |
|
|
428 |
logging.debug("Got data from cluster, writing instance status file") |
|
429 |
|
|
430 |
result = all_results[0] |
|
431 |
smap = {} |
|
432 |
|
|
433 |
instances = {} |
|
434 |
|
|
435 |
# write the upfile |
|
436 |
up_data = "".join(["%s %s\n" % (fields[0], fields[1]) for fields in result]) |
|
437 |
utils.WriteFile(file_name=constants.INSTANCE_UPFILE, data=up_data) |
|
438 |
|
|
439 |
for fields in result: |
|
440 |
(name, status, autostart, snodes) = fields |
|
441 |
|
|
442 |
# update the secondary node map |
|
443 |
for node in snodes: |
|
444 |
if node not in smap: |
|
445 |
smap[node] = [] |
|
446 |
smap[node].append(name) |
|
447 |
|
|
448 |
instances[name] = Instance(name, status, autostart) |
|
449 |
|
|
450 |
nodes = dict([(name, (bootid, offline)) |
|
451 |
for name, bootid, offline in all_results[1]]) |
|
452 |
|
|
453 |
client.ArchiveJob(job_id) |
|
454 |
|
|
455 |
return instances, nodes, smap |
|
456 |
|
|
457 |
|
|
458 |
class Watcher(object): |
|
459 |
"""Encapsulate the logic for restarting erroneously halted virtual machines. |
|
460 |
|
|
461 |
The calling program should periodically instantiate me and call Run(). |
|
462 |
This will traverse the list of instances, and make up to MAXTRIES attempts |
|
463 |
to restart machines that are down. |
|
464 |
|
|
465 |
""" |
|
466 |
def __init__(self, opts, notepad): |
|
467 |
self.notepad = notepad |
|
468 |
master = client.QueryConfigValues(["master_node"])[0] |
|
469 |
if master != netutils.Hostname.GetSysName(): |
|
470 |
raise NotMasterError("This is not the master node") |
|
471 |
# first archive old jobs |
|
472 |
self.ArchiveJobs(opts.job_age) |
|
473 |
# and only then submit new ones |
|
474 |
self.instances, self.bootids, self.smap = GetClusterData() |
|
475 |
self.started_instances = set() |
|
476 |
self.opts = opts |
|
477 |
|
|
478 |
def Run(self): |
|
479 |
"""Watcher run sequence. |
|
480 |
|
|
481 |
""" |
|
482 |
notepad = self.notepad |
|
483 |
self.CheckInstances(notepad) |
|
484 |
self.CheckDisks(notepad) |
|
485 |
self.VerifyDisks() |
|
486 |
|
|
487 |
@staticmethod |
|
488 |
def ArchiveJobs(age): |
|
489 |
"""Archive old jobs. |
|
490 |
|
|
491 |
""" |
|
492 |
arch_count, left_count = client.AutoArchiveJobs(age) |
|
493 |
logging.debug("Archived %s jobs, left %s", arch_count, left_count) |
|
494 |
|
|
495 |
def CheckDisks(self, notepad): |
|
496 |
"""Check all nodes for restarted ones. |
|
497 |
|
|
498 |
""" |
|
499 |
check_nodes = [] |
|
500 |
for name, (new_id, offline) in self.bootids.iteritems(): |
|
501 |
old = notepad.GetNodeBootID(name) |
|
502 |
if new_id is None: |
|
503 |
# Bad node, not returning a boot id |
|
504 |
if not offline: |
|
505 |
logging.debug("Node %s missing boot id, skipping secondary checks", |
|
506 |
name) |
|
507 |
continue |
|
508 |
if old != new_id: |
|
509 |
# Node's boot ID has changed, proably through a reboot. |
|
510 |
check_nodes.append(name) |
|
511 |
|
|
512 |
if check_nodes: |
|
513 |
# Activate disks for all instances with any of the checked nodes as a |
|
514 |
# secondary node. |
|
515 |
for node in check_nodes: |
|
516 |
if node not in self.smap: |
|
517 |
continue |
|
518 |
for instance_name in self.smap[node]: |
|
519 |
instance = self.instances[instance_name] |
|
520 |
if not instance.autostart: |
|
521 |
logging.info(("Skipping disk activation for non-autostart" |
|
522 |
" instance %s"), instance.name) |
|
523 |
continue |
|
524 |
if instance.name in self.started_instances: |
|
525 |
# we already tried to start the instance, which should have |
|
526 |
# activated its drives (if they can be at all) |
|
527 |
continue |
|
528 |
try: |
|
529 |
logging.info("Activating disks for instance %s", instance.name) |
|
530 |
instance.ActivateDisks() |
|
531 |
except Exception: # pylint: disable-msg=W0703 |
|
532 |
logging.exception("Error while activating disks for instance %s", |
|
533 |
instance.name) |
|
534 |
|
|
535 |
# Keep changed boot IDs |
|
536 |
for name in check_nodes: |
|
537 |
notepad.SetNodeBootID(name, self.bootids[name][0]) |
|
538 |
|
|
539 |
def CheckInstances(self, notepad): |
|
540 |
"""Make a pass over the list of instances, restarting downed ones. |
|
541 |
|
|
542 |
""" |
|
543 |
notepad.MaintainInstanceList(self.instances.keys()) |
|
544 |
|
|
545 |
for instance in self.instances.values(): |
|
546 |
if instance.state in BAD_STATES: |
|
547 |
n = notepad.NumberOfRestartAttempts(instance) |
|
548 |
|
|
549 |
if n > MAXTRIES: |
|
550 |
logging.warning("Not restarting instance %s, retries exhausted", |
|
551 |
instance.name) |
|
552 |
continue |
|
553 |
elif n < MAXTRIES: |
|
554 |
last = " (Attempt #%d)" % (n + 1) |
|
555 |
else: |
|
556 |
notepad.RecordRestartAttempt(instance) |
|
557 |
logging.error("Could not restart %s after %d attempts, giving up", |
|
558 |
instance.name, MAXTRIES) |
|
559 |
continue |
|
560 |
try: |
|
561 |
logging.info("Restarting %s%s", |
|
562 |
instance.name, last) |
|
563 |
instance.Restart() |
|
564 |
self.started_instances.add(instance.name) |
|
565 |
except Exception: # pylint: disable-msg=W0703 |
|
566 |
logging.exception("Error while restarting instance %s", |
|
567 |
instance.name) |
|
568 |
|
|
569 |
notepad.RecordRestartAttempt(instance) |
|
570 |
elif instance.state in HELPLESS_STATES: |
|
571 |
if notepad.NumberOfRestartAttempts(instance): |
|
572 |
notepad.RemoveInstance(instance) |
|
573 |
else: |
|
574 |
if notepad.NumberOfRestartAttempts(instance): |
|
575 |
notepad.RemoveInstance(instance) |
|
576 |
logging.info("Restart of %s succeeded", instance.name) |
|
577 |
|
|
578 |
@staticmethod |
|
579 |
def VerifyDisks(): |
|
580 |
"""Run gnt-cluster verify-disks. |
|
581 |
|
|
582 |
""" |
|
583 |
op = opcodes.OpVerifyDisks() |
|
584 |
job_id = client.SubmitJob([op]) |
|
585 |
result = cli.PollJob(job_id, cl=client, feedback_fn=logging.debug)[0] |
|
586 |
client.ArchiveJob(job_id) |
|
587 |
if not isinstance(result, (tuple, list)): |
|
588 |
logging.error("Can't get a valid result from verify-disks") |
|
589 |
return |
|
590 |
offline_disk_instances = result[2] |
|
591 |
if not offline_disk_instances: |
|
592 |
# nothing to do |
|
593 |
return |
|
594 |
logging.debug("Will activate disks for instances %s", |
|
595 |
utils.CommaJoin(offline_disk_instances)) |
|
596 |
# we submit only one job, and wait for it. not optimal, but spams |
|
597 |
# less the job queue |
|
598 |
job = [opcodes.OpActivateInstanceDisks(instance_name=name) |
|
599 |
for name in offline_disk_instances] |
|
600 |
job_id = cli.SendJob(job, cl=client) |
|
601 |
|
|
602 |
try: |
|
603 |
cli.PollJob(job_id, cl=client, feedback_fn=logging.debug) |
|
604 |
except Exception: # pylint: disable-msg=W0703 |
|
605 |
logging.exception("Error while activating disks") |
|
606 |
|
|
607 |
|
|
608 |
def OpenStateFile(path): |
|
609 |
"""Opens the state file and acquires a lock on it. |
|
610 |
|
|
611 |
@type path: string |
|
612 |
@param path: Path to state file |
|
613 |
|
|
614 |
""" |
|
615 |
# The two-step dance below is necessary to allow both opening existing |
|
616 |
# file read/write and creating if not existing. Vanilla open will truncate |
|
617 |
# an existing file -or- allow creating if not existing. |
|
618 |
statefile_fd = os.open(path, os.O_RDWR | os.O_CREAT) |
|
619 |
|
|
620 |
# Try to acquire lock on state file. If this fails, another watcher instance |
|
621 |
# might already be running or another program is temporarily blocking the |
|
622 |
# watcher from running. |
|
623 |
try: |
|
624 |
utils.LockFile(statefile_fd) |
|
625 |
except errors.LockError, err: |
|
626 |
logging.error("Can't acquire lock on state file %s: %s", path, err) |
|
627 |
return None |
|
628 |
|
|
629 |
return os.fdopen(statefile_fd, "w+") |
|
630 |
|
|
631 |
|
|
632 |
def IsRapiResponding(hostname): |
|
633 |
"""Connects to RAPI port and does a simple test. |
|
634 |
|
|
635 |
Connects to RAPI port of hostname and does a simple test. At this time, the |
|
636 |
test is GetVersion. |
|
637 |
|
|
638 |
@type hostname: string |
|
639 |
@param hostname: hostname of the node to connect to. |
|
640 |
@rtype: bool |
|
641 |
@return: Whether RAPI is working properly |
|
642 |
|
|
643 |
""" |
|
644 |
curl_config = rapi.client.GenericCurlConfig() |
|
645 |
rapi_client = rapi.client.GanetiRapiClient(hostname, |
|
646 |
curl_config_fn=curl_config) |
|
647 |
try: |
|
648 |
master_version = rapi_client.GetVersion() |
|
649 |
except rapi.client.CertificateError, err: |
|
650 |
logging.warning("RAPI Error: CertificateError (%s)", err) |
|
651 |
return False |
|
652 |
except rapi.client.GanetiApiError, err: |
|
653 |
logging.warning("RAPI Error: GanetiApiError (%s)", err) |
|
654 |
return False |
|
655 |
logging.debug("RAPI Result: master_version is %s", master_version) |
|
656 |
return master_version == constants.RAPI_VERSION |
|
657 |
|
|
658 |
|
|
659 |
def ParseOptions(): |
|
660 |
"""Parse the command line options. |
|
661 |
|
|
662 |
@return: (options, args) as from OptionParser.parse_args() |
|
663 |
|
|
664 |
""" |
|
665 |
parser = OptionParser(description="Ganeti cluster watcher", |
|
666 |
usage="%prog [-d]", |
|
667 |
version="%%prog (ganeti) %s" % |
|
668 |
constants.RELEASE_VERSION) |
|
669 |
|
|
670 |
parser.add_option(cli.DEBUG_OPT) |
|
671 |
parser.add_option("-A", "--job-age", dest="job_age", |
|
672 |
help="Autoarchive jobs older than this age (default" |
|
673 |
" 6 hours)", default=6*3600) |
|
674 |
parser.add_option("--ignore-pause", dest="ignore_pause", default=False, |
|
675 |
action="store_true", help="Ignore cluster pause setting") |
|
676 |
options, args = parser.parse_args() |
|
677 |
options.job_age = cli.ParseTimespec(options.job_age) |
|
678 |
return options, args |
|
679 |
|
|
680 |
|
|
681 |
@rapi.client.UsesRapiClient |
|
682 |
def main(): |
|
683 |
"""Main function. |
|
684 |
|
|
685 |
""" |
|
686 |
global client # pylint: disable-msg=W0603 |
|
687 |
|
|
688 |
options, args = ParseOptions() |
|
689 |
|
|
690 |
if args: # watcher doesn't take any arguments |
|
691 |
print >> sys.stderr, ("Usage: %s [-f] " % sys.argv[0]) |
|
692 |
sys.exit(constants.EXIT_FAILURE) |
|
693 |
|
|
694 |
utils.SetupLogging(constants.LOG_WATCHER, debug=options.debug, |
|
695 |
stderr_logging=options.debug) |
|
696 |
|
|
697 |
if ShouldPause() and not options.ignore_pause: |
|
698 |
logging.debug("Pause has been set, exiting") |
|
699 |
sys.exit(constants.EXIT_SUCCESS) |
|
700 |
|
|
701 |
statefile = OpenStateFile(constants.WATCHER_STATEFILE) |
|
702 |
if not statefile: |
|
703 |
sys.exit(constants.EXIT_FAILURE) |
|
704 |
|
|
705 |
update_file = False |
|
706 |
try: |
|
707 |
StartNodeDaemons() |
|
708 |
RunWatcherHooks() |
|
709 |
# run node maintenance in all cases, even if master, so that old |
|
710 |
# masters can be properly cleaned up too |
|
711 |
if NodeMaintenance.ShouldRun(): |
|
712 |
NodeMaintenance().Exec() |
|
713 |
|
|
714 |
notepad = WatcherState(statefile) |
|
715 |
try: |
|
716 |
try: |
|
717 |
client = cli.GetClient() |
|
718 |
except errors.OpPrereqError: |
|
719 |
# this is, from cli.GetClient, a not-master case |
|
720 |
logging.debug("Not on master, exiting") |
|
721 |
update_file = True |
|
722 |
sys.exit(constants.EXIT_SUCCESS) |
|
723 |
except luxi.NoMasterError, err: |
|
724 |
logging.warning("Master seems to be down (%s), trying to restart", |
|
725 |
str(err)) |
|
726 |
if not utils.EnsureDaemon(constants.MASTERD): |
|
727 |
logging.critical("Can't start the master, exiting") |
|
728 |
sys.exit(constants.EXIT_FAILURE) |
|
729 |
# else retry the connection |
|
730 |
client = cli.GetClient() |
|
731 |
|
|
732 |
# we are on master now |
|
733 |
utils.EnsureDaemon(constants.RAPI) |
|
734 |
|
|
735 |
# If RAPI isn't responding to queries, try one restart. |
|
736 |
logging.debug("Attempting to talk with RAPI.") |
|
737 |
if not IsRapiResponding(constants.IP4_ADDRESS_LOCALHOST): |
|
738 |
logging.warning("Couldn't get answer from Ganeti RAPI daemon." |
|
739 |
" Restarting Ganeti RAPI.") |
|
740 |
utils.StopDaemon(constants.RAPI) |
|
741 |
utils.EnsureDaemon(constants.RAPI) |
|
742 |
logging.debug("Second attempt to talk with RAPI") |
|
743 |
if not IsRapiResponding(constants.IP4_ADDRESS_LOCALHOST): |
|
744 |
logging.fatal("RAPI is not responding. Please investigate.") |
|
745 |
logging.debug("Successfully talked to RAPI.") |
|
746 |
|
|
747 |
try: |
|
748 |
watcher = Watcher(options, notepad) |
|
749 |
except errors.ConfigurationError: |
|
750 |
# Just exit if there's no configuration |
|
751 |
update_file = True |
|
752 |
sys.exit(constants.EXIT_SUCCESS) |
|
753 |
|
|
754 |
watcher.Run() |
|
755 |
update_file = True |
|
756 |
|
|
757 |
finally: |
|
758 |
if update_file: |
|
759 |
notepad.Save() |
|
760 |
else: |
|
761 |
logging.debug("Not updating status file due to failure") |
|
762 |
except SystemExit: |
|
763 |
raise |
|
764 |
except NotMasterError: |
|
765 |
logging.debug("Not master, exiting") |
|
766 |
sys.exit(constants.EXIT_NOTMASTER) |
|
767 |
except errors.ResolverError, err: |
|
768 |
logging.error("Cannot resolve hostname '%s', exiting.", err.args[0]) |
|
769 |
sys.exit(constants.EXIT_NODESETUP_ERROR) |
|
770 |
except errors.JobQueueFull: |
|
771 |
logging.error("Job queue is full, can't query cluster state") |
|
772 |
except errors.JobQueueDrainError: |
|
773 |
logging.error("Job queue is drained, can't maintain cluster state") |
|
774 |
except Exception, err: |
|
775 |
logging.exception(str(err)) |
|
776 |
sys.exit(constants.EXIT_FAILURE) |
|
777 |
|
|
778 |
|
|
779 |
if __name__ == '__main__': |
|
780 |
main() |
b/lib/watcher/__init__.py | ||
---|---|---|
1 |
# |
|
2 |
# |
|
3 |
|
|
4 |
# Copyright (C) 2006, 2007, 2008, 2009, 2010 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 |
"""Tool to restart erroneously downed virtual machines. |
|
23 |
|
|
24 |
This program and set of classes implement a watchdog to restart |
|
25 |
virtual machines in a Ganeti cluster that have crashed or been killed |
|
26 |
by a node reboot. Run from cron or similar. |
|
27 |
|
|
28 |
""" |
|
29 |
|
|
30 |
# pylint: disable-msg=C0103,W0142 |
|
31 |
|
|
32 |
# C0103: Invalid name ganeti-watcher |
|
33 |
|
|
34 |
import os |
|
35 |
import sys |
|
36 |
import time |
|
37 |
import logging |
|
38 |
from optparse import OptionParser |
|
39 |
|
|
40 |
from ganeti import utils |
|
41 |
from ganeti import constants |
|
42 |
from ganeti import serializer |
|
43 |
from ganeti import errors |
|
44 |
from ganeti import opcodes |
|
45 |
from ganeti import cli |
|
46 |
from ganeti import luxi |
|
47 |
from ganeti import ssconf |
|
48 |
from ganeti import bdev |
|
49 |
from ganeti import hypervisor |
|
50 |
from ganeti import rapi |
|
51 |
from ganeti.confd import client as confd_client |
|
52 |
from ganeti import netutils |
|
53 |
|
|
54 |
import ganeti.rapi.client # pylint: disable-msg=W0611 |
|
55 |
|
|
56 |
|
|
57 |
MAXTRIES = 5 |
|
58 |
# Delete any record that is older than 8 hours; this value is based on |
|
59 |
# the fact that the current retry counter is 5, and watcher runs every |
|
60 |
# 5 minutes, so it takes around half an hour to exceed the retry |
|
61 |
# counter, so 8 hours (16*1/2h) seems like a reasonable reset time |
|
62 |
RETRY_EXPIRATION = 8 * 3600 |
|
63 |
BAD_STATES = ['ERROR_down'] |
|
64 |
HELPLESS_STATES = ['ERROR_nodedown', 'ERROR_nodeoffline'] |
|
65 |
NOTICE = 'NOTICE' |
|
66 |
ERROR = 'ERROR' |
|
67 |
KEY_RESTART_COUNT = "restart_count" |
|
68 |
KEY_RESTART_WHEN = "restart_when" |
|
69 |
KEY_BOOT_ID = "bootid" |
|
70 |
|
|
71 |
|
|
72 |
# Global client object |
|
73 |
client = None |
|
74 |
|
|
75 |
|
|
76 |
class NotMasterError(errors.GenericError): |
|
77 |
"""Exception raised when this host is not the master.""" |
|
78 |
|
|
79 |
|
|
80 |
def ShouldPause(): |
|
81 |
"""Check whether we should pause. |
|
82 |
|
|
83 |
""" |
|
84 |
return bool(utils.ReadWatcherPauseFile(constants.WATCHER_PAUSEFILE)) |
|
85 |
|
|
86 |
|
|
87 |
def StartNodeDaemons(): |
|
88 |
"""Start all the daemons that should be running on all nodes. |
|
89 |
|
|
90 |
""" |
|
91 |
# on master or not, try to start the node daemon |
|
92 |
utils.EnsureDaemon(constants.NODED) |
|
93 |
# start confd as well. On non candidates it will be in disabled mode. |
|
94 |
utils.EnsureDaemon(constants.CONFD) |
|
95 |
|
|
96 |
|
|
97 |
def RunWatcherHooks(): |
|
98 |
"""Run the watcher hooks. |
|
99 |
|
|
100 |
""" |
|
101 |
hooks_dir = utils.PathJoin(constants.HOOKS_BASE_DIR, |
|
102 |
constants.HOOKS_NAME_WATCHER) |
|
103 |
if not os.path.isdir(hooks_dir): |
|
104 |
return |
|
105 |
|
|
106 |
try: |
|
107 |
results = utils.RunParts(hooks_dir) |
|
108 |
except Exception, msg: # pylint: disable-msg=W0703 |
|
109 |
logging.critical("RunParts %s failed: %s", hooks_dir, msg) |
|
110 |
|
|
111 |
for (relname, status, runresult) in results: |
|
112 |
if status == constants.RUNPARTS_SKIP: |
|
113 |
logging.debug("Watcher hook %s: skipped", relname) |
|
114 |
elif status == constants.RUNPARTS_ERR: |
|
115 |
logging.warning("Watcher hook %s: error (%s)", relname, runresult) |
|
116 |
elif status == constants.RUNPARTS_RUN: |
|
117 |
if runresult.failed: |
|
118 |
logging.warning("Watcher hook %s: failed (exit: %d) (output: %s)", |
|
119 |
relname, runresult.exit_code, runresult.output) |
|
120 |
else: |
|
121 |
logging.debug("Watcher hook %s: success (output: %s)", relname, |
|
122 |
runresult.output) |
|
123 |
|
|
124 |
|
|
125 |
class NodeMaintenance(object): |
|
126 |
"""Talks to confd daemons and possible shutdown instances/drbd devices. |
|
127 |
|
|
128 |
""" |
|
129 |
def __init__(self): |
|
130 |
self.store_cb = confd_client.StoreResultCallback() |
|
131 |
self.filter_cb = confd_client.ConfdFilterCallback(self.store_cb) |
|
132 |
self.confd_client = confd_client.GetConfdClient(self.filter_cb) |
|
133 |
|
|
134 |
@staticmethod |
|
135 |
def ShouldRun(): |
|
136 |
"""Checks whether node maintenance should run. |
|
137 |
|
|
138 |
""" |
|
139 |
try: |
|
140 |
return ssconf.SimpleStore().GetMaintainNodeHealth() |
|
141 |
except errors.ConfigurationError, err: |
|
142 |
logging.error("Configuration error, not activating node maintenance: %s", |
|
143 |
err) |
|
144 |
return False |
|
145 |
|
|
146 |
@staticmethod |
|
147 |
def GetRunningInstances(): |
|
148 |
"""Compute list of hypervisor/running instances. |
|
149 |
|
|
150 |
""" |
|
151 |
hyp_list = ssconf.SimpleStore().GetHypervisorList() |
|
152 |
results = [] |
|
153 |
for hv_name in hyp_list: |
|
154 |
try: |
|
155 |
hv = hypervisor.GetHypervisor(hv_name) |
|
156 |
ilist = hv.ListInstances() |
|
157 |
results.extend([(iname, hv_name) for iname in ilist]) |
|
158 |
except: # pylint: disable-msg=W0702 |
|
159 |
logging.error("Error while listing instances for hypervisor %s", |
|
160 |
hv_name, exc_info=True) |
|
161 |
return results |
|
162 |
|
|
163 |
@staticmethod |
|
164 |
def GetUsedDRBDs(): |
|
165 |
"""Get list of used DRBD minors. |
|
166 |
|
|
167 |
""" |
|
168 |
return bdev.DRBD8.GetUsedDevs().keys() |
|
169 |
|
|
170 |
@classmethod |
|
171 |
def DoMaintenance(cls, role): |
|
172 |
"""Maintain the instance list. |
|
173 |
|
|
174 |
""" |
|
175 |
if role == constants.CONFD_NODE_ROLE_OFFLINE: |
|
176 |
inst_running = cls.GetRunningInstances() |
|
177 |
cls.ShutdownInstances(inst_running) |
|
178 |
drbd_running = cls.GetUsedDRBDs() |
|
179 |
cls.ShutdownDRBD(drbd_running) |
|
180 |
else: |
|
181 |
logging.debug("Not doing anything for role %s", role) |
|
182 |
|
|
183 |
@staticmethod |
|
184 |
def ShutdownInstances(inst_running): |
|
185 |
"""Shutdown running instances. |
|
186 |
|
|
187 |
""" |
|
188 |
names_running = set([i[0] for i in inst_running]) |
|
189 |
if names_running: |
|
190 |
logging.info("Following instances should not be running," |
|
191 |
" shutting them down: %s", utils.CommaJoin(names_running)) |
|
192 |
# this dictionary will collapse duplicate instance names (only |
|
193 |
# xen pvm/vhm) into a single key, which is fine |
|
194 |
i2h = dict(inst_running) |
|
195 |
for name in names_running: |
|
196 |
hv_name = i2h[name] |
|
197 |
hv = hypervisor.GetHypervisor(hv_name) |
|
198 |
hv.StopInstance(None, force=True, name=name) |
|
199 |
|
|
200 |
@staticmethod |
|
201 |
def ShutdownDRBD(drbd_running): |
|
202 |
"""Shutdown active DRBD devices. |
|
203 |
|
|
204 |
""" |
|
205 |
if drbd_running: |
|
206 |
logging.info("Following DRBD minors should not be active," |
|
207 |
" shutting them down: %s", utils.CommaJoin(drbd_running)) |
|
208 |
for minor in drbd_running: |
|
209 |
# pylint: disable-msg=W0212 |
|
210 |
# using the private method as is, pending enhancements to the DRBD |
|
211 |
# interface |
|
212 |
bdev.DRBD8._ShutdownAll(minor) |
|
213 |
|
|
214 |
def Exec(self): |
|
215 |
"""Check node status versus cluster desired state. |
|
216 |
|
|
217 |
""" |
|
218 |
my_name = netutils.Hostname.GetSysName() |
|
219 |
req = confd_client.ConfdClientRequest(type= |
|
220 |
constants.CONFD_REQ_NODE_ROLE_BYNAME, |
|
221 |
query=my_name) |
|
222 |
self.confd_client.SendRequest(req, async=False, coverage=-1) |
|
223 |
timed_out, _, _ = self.confd_client.WaitForReply(req.rsalt) |
|
224 |
if not timed_out: |
|
225 |
# should have a valid response |
|
226 |
status, result = self.store_cb.GetResponse(req.rsalt) |
|
227 |
assert status, "Missing result but received replies" |
|
228 |
if not self.filter_cb.consistent[req.rsalt]: |
|
229 |
logging.warning("Inconsistent replies, not doing anything") |
|
230 |
return |
|
231 |
self.DoMaintenance(result.server_reply.answer) |
|
232 |
else: |
|
233 |
logging.warning("Confd query timed out, cannot do maintenance actions") |
|
234 |
|
|
235 |
|
|
236 |
class WatcherState(object): |
|
237 |
"""Interface to a state file recording restart attempts. |
|
238 |
|
|
239 |
""" |
|
240 |
def __init__(self, statefile): |
|
241 |
"""Open, lock, read and parse the file. |
|
242 |
|
|
243 |
@type statefile: file |
|
244 |
@param statefile: State file object |
|
245 |
|
|
246 |
""" |
|
247 |
self.statefile = statefile |
|
248 |
|
|
249 |
try: |
|
250 |
state_data = self.statefile.read() |
|
251 |
if not state_data: |
|
252 |
self._data = {} |
|
253 |
else: |
|
254 |
self._data = serializer.Load(state_data) |
|
255 |
except Exception, msg: # pylint: disable-msg=W0703 |
|
256 |
# Ignore errors while loading the file and treat it as empty |
|
257 |
self._data = {} |
|
258 |
logging.warning(("Invalid state file. Using defaults." |
|
259 |
" Error message: %s"), msg) |
|
260 |
|
|
261 |
if "instance" not in self._data: |
|
262 |
self._data["instance"] = {} |
|
263 |
if "node" not in self._data: |
|
264 |
self._data["node"] = {} |
|
265 |
|
|
266 |
self._orig_data = serializer.Dump(self._data) |
|
267 |
|
|
268 |
def Save(self): |
|
269 |
"""Save state to file, then unlock and close it. |
|
270 |
|
|
271 |
""" |
|
272 |
assert self.statefile |
|
273 |
|
|
274 |
serialized_form = serializer.Dump(self._data) |
|
275 |
if self._orig_data == serialized_form: |
|
276 |
logging.debug("Data didn't change, just touching status file") |
|
277 |
os.utime(constants.WATCHER_STATEFILE, None) |
|
278 |
return |
|
279 |
|
|
280 |
# We need to make sure the file is locked before renaming it, otherwise |
|
281 |
# starting ganeti-watcher again at the same time will create a conflict. |
|
282 |
fd = utils.WriteFile(constants.WATCHER_STATEFILE, |
|
283 |
data=serialized_form, |
|
284 |
prewrite=utils.LockFile, close=False) |
|
285 |
self.statefile = os.fdopen(fd, 'w+') |
|
286 |
|
|
287 |
def Close(self): |
|
288 |
"""Unlock configuration file and close it. |
|
289 |
|
|
290 |
""" |
|
291 |
assert self.statefile |
|
292 |
|
|
293 |
# Files are automatically unlocked when closing them |
|
294 |
self.statefile.close() |
|
295 |
self.statefile = None |
|
296 |
|
|
297 |
def GetNodeBootID(self, name): |
|
298 |
"""Returns the last boot ID of a node or None. |
|
299 |
|
|
300 |
""" |
|
301 |
ndata = self._data["node"] |
|
302 |
|
|
303 |
if name in ndata and KEY_BOOT_ID in ndata[name]: |
|
304 |
return ndata[name][KEY_BOOT_ID] |
|
305 |
return None |
|
306 |
|
|
307 |
def SetNodeBootID(self, name, bootid): |
|
308 |
"""Sets the boot ID of a node. |
|
309 |
|
|
310 |
""" |
|
311 |
assert bootid |
|
312 |
|
|
313 |
ndata = self._data["node"] |
|
314 |
|
|
315 |
if name not in ndata: |
|
316 |
ndata[name] = {} |
|
317 |
|
|
318 |
ndata[name][KEY_BOOT_ID] = bootid |
|
319 |
|
|
320 |
def NumberOfRestartAttempts(self, instance): |
|
321 |
"""Returns number of previous restart attempts. |
|
322 |
|
|
323 |
@type instance: L{Instance} |
|
324 |
@param instance: the instance to look up |
|
325 |
|
|
326 |
""" |
|
327 |
idata = self._data["instance"] |
|
328 |
|
|
329 |
if instance.name in idata: |
|
330 |
return idata[instance.name][KEY_RESTART_COUNT] |
|
331 |
|
|
332 |
return 0 |
|
333 |
|
|
334 |
def MaintainInstanceList(self, instances): |
|
335 |
"""Perform maintenance on the recorded instances. |
|
336 |
|
|
337 |
@type instances: list of string |
|
338 |
@param instances: the list of currently existing instances |
|
339 |
|
|
340 |
""" |
|
341 |
idict = self._data["instance"] |
|
342 |
# First, delete obsolete instances |
|
343 |
obsolete_instances = set(idict).difference(instances) |
|
344 |
for inst in obsolete_instances: |
|
345 |
logging.debug("Forgetting obsolete instance %s", inst) |
|
346 |
del idict[inst] |
|
347 |
|
|
348 |
# Second, delete expired records |
|
349 |
earliest = time.time() - RETRY_EXPIRATION |
|
350 |
expired_instances = [i for i in idict |
|
351 |
if idict[i][KEY_RESTART_WHEN] < earliest] |
|
352 |
for inst in expired_instances: |
|
353 |
logging.debug("Expiring record for instance %s", inst) |
|
354 |
del idict[inst] |
|
355 |
|
|
356 |
def RecordRestartAttempt(self, instance): |
|
357 |
"""Record a restart attempt. |
|
358 |
|
|
359 |
@type instance: L{Instance} |
|
360 |
@param instance: the instance being restarted |
|
361 |
|
|
362 |
""" |
|
363 |
idata = self._data["instance"] |
|
364 |
|
|
365 |
if instance.name not in idata: |
|
366 |
inst = idata[instance.name] = {} |
|
367 |
else: |
|
368 |
inst = idata[instance.name] |
|
369 |
|
|
370 |
inst[KEY_RESTART_WHEN] = time.time() |
|
371 |
inst[KEY_RESTART_COUNT] = inst.get(KEY_RESTART_COUNT, 0) + 1 |
|
372 |
|
|
373 |
def RemoveInstance(self, instance): |
|
374 |
"""Update state to reflect that a machine is running. |
|
375 |
|
|
376 |
This method removes the record for a named instance (as we only |
|
377 |
track down instances). |
|
378 |
|
|
379 |
@type instance: L{Instance} |
|
380 |
@param instance: the instance to remove from books |
|
381 |
|
|
382 |
""" |
|
383 |
idata = self._data["instance"] |
|
384 |
|
|
385 |
if instance.name in idata: |
|
386 |
del idata[instance.name] |
|
387 |
|
|
388 |
|
|
389 |
class Instance(object): |
|
390 |
"""Abstraction for a Virtual Machine instance. |
|
391 |
|
|
392 |
""" |
|
393 |
def __init__(self, name, state, autostart): |
|
394 |
self.name = name |
|
395 |
self.state = state |
|
396 |
self.autostart = autostart |
|
397 |
|
|
398 |
def Restart(self): |
|
399 |
"""Encapsulates the start of an instance. |
|
400 |
|
|
401 |
""" |
|
402 |
op = opcodes.OpStartupInstance(instance_name=self.name, force=False) |
|
403 |
cli.SubmitOpCode(op, cl=client) |
|
404 |
|
|
405 |
def ActivateDisks(self): |
|
406 |
"""Encapsulates the activation of all disks of an instance. |
|
407 |
|
|
408 |
""" |
|
409 |
op = opcodes.OpActivateInstanceDisks(instance_name=self.name) |
|
410 |
cli.SubmitOpCode(op, cl=client) |
|
411 |
|
|
412 |
|
|
413 |
def GetClusterData(): |
|
414 |
"""Get a list of instances on this cluster. |
|
415 |
|
|
416 |
""" |
|
417 |
op1_fields = ["name", "status", "admin_state", "snodes"] |
|
418 |
op1 = opcodes.OpQueryInstances(output_fields=op1_fields, names=[], |
|
419 |
use_locking=True) |
|
420 |
op2_fields = ["name", "bootid", "offline"] |
|
421 |
op2 = opcodes.OpQueryNodes(output_fields=op2_fields, names=[], |
|
422 |
use_locking=True) |
|
423 |
|
|
424 |
job_id = client.SubmitJob([op1, op2]) |
|
425 |
|
|
426 |
all_results = cli.PollJob(job_id, cl=client, feedback_fn=logging.debug) |
|
427 |
|
|
428 |
logging.debug("Got data from cluster, writing instance status file") |
|
429 |
|
|
430 |
result = all_results[0] |
|
431 |
smap = {} |
|
432 |
|
|
433 |
instances = {} |
|
434 |
|
|
435 |
# write the upfile |
|
436 |
up_data = "".join(["%s %s\n" % (fields[0], fields[1]) for fields in result]) |
|
437 |
utils.WriteFile(file_name=constants.INSTANCE_UPFILE, data=up_data) |
|
438 |
|
|
439 |
for fields in result: |
|
440 |
(name, status, autostart, snodes) = fields |
|
441 |
|
|
442 |
# update the secondary node map |
|
443 |
for node in snodes: |
|
444 |
if node not in smap: |
|
445 |
smap[node] = [] |
|
446 |
smap[node].append(name) |
|
447 |
|
|
448 |
instances[name] = Instance(name, status, autostart) |
|
449 |
|
|
450 |
nodes = dict([(name, (bootid, offline)) |
|
451 |
for name, bootid, offline in all_results[1]]) |
|
452 |
|
|
453 |
client.ArchiveJob(job_id) |
|
454 |
|
|
455 |
return instances, nodes, smap |
|
456 |
|
|
457 |
|
|
458 |
class Watcher(object): |
|
459 |
"""Encapsulate the logic for restarting erroneously halted virtual machines. |
|
460 |
|
|
461 |
The calling program should periodically instantiate me and call Run(). |
|
462 |
This will traverse the list of instances, and make up to MAXTRIES attempts |
|
463 |
to restart machines that are down. |
|
464 |
|
|
465 |
""" |
|
466 |
def __init__(self, opts, notepad): |
|
467 |
self.notepad = notepad |
|
468 |
master = client.QueryConfigValues(["master_node"])[0] |
|
469 |
if master != netutils.Hostname.GetSysName(): |
|
470 |
raise NotMasterError("This is not the master node") |
|
471 |
# first archive old jobs |
|
472 |
self.ArchiveJobs(opts.job_age) |
|
473 |
# and only then submit new ones |
|
474 |
self.instances, self.bootids, self.smap = GetClusterData() |
|
475 |
self.started_instances = set() |
|
476 |
self.opts = opts |
|
477 |
|
|
478 |
def Run(self): |
|
479 |
"""Watcher run sequence. |
|
480 |
|
|
481 |
""" |
|
482 |
notepad = self.notepad |
|
483 |
self.CheckInstances(notepad) |
|
484 |
self.CheckDisks(notepad) |
|
485 |
self.VerifyDisks() |
|
486 |
|
|
487 |
@staticmethod |
|
488 |
def ArchiveJobs(age): |
|
489 |
"""Archive old jobs. |
|
490 |
|
|
491 |
""" |
|
492 |
arch_count, left_count = client.AutoArchiveJobs(age) |
|
493 |
logging.debug("Archived %s jobs, left %s", arch_count, left_count) |
|
494 |
|
|
495 |
def CheckDisks(self, notepad): |
|
496 |
"""Check all nodes for restarted ones. |
|
497 |
|
|
498 |
""" |
|
499 |
check_nodes = [] |
|
500 |
for name, (new_id, offline) in self.bootids.iteritems(): |
|
501 |
old = notepad.GetNodeBootID(name) |
|
502 |
if new_id is None: |
|
503 |
# Bad node, not returning a boot id |
|
504 |
if not offline: |
|
505 |
logging.debug("Node %s missing boot id, skipping secondary checks", |
|
506 |
name) |
|
507 |
continue |
|
508 |
if old != new_id: |
|
509 |
# Node's boot ID has changed, proably through a reboot. |
|
510 |
check_nodes.append(name) |
|
511 |
|
|
512 |
if check_nodes: |
|
513 |
# Activate disks for all instances with any of the checked nodes as a |
|
514 |
# secondary node. |
|
515 |
for node in check_nodes: |
|
516 |
if node not in self.smap: |
|
517 |
continue |
|
518 |
for instance_name in self.smap[node]: |
|
519 |
instance = self.instances[instance_name] |
|
520 |
if not instance.autostart: |
|
521 |
logging.info(("Skipping disk activation for non-autostart" |
|
522 |
" instance %s"), instance.name) |
|
523 |
continue |
|
524 |
if instance.name in self.started_instances: |
|
525 |
# we already tried to start the instance, which should have |
|
526 |
# activated its drives (if they can be at all) |
|
527 |
continue |
|
528 |
try: |
|
529 |
logging.info("Activating disks for instance %s", instance.name) |
|
530 |
instance.ActivateDisks() |
|
531 |
except Exception: # pylint: disable-msg=W0703 |
|
532 |
logging.exception("Error while activating disks for instance %s", |
|
533 |
instance.name) |
|
534 |
|
|
535 |
# Keep changed boot IDs |
|
536 |
for name in check_nodes: |
|
537 |
notepad.SetNodeBootID(name, self.bootids[name][0]) |
|
538 |
|
|
539 |
def CheckInstances(self, notepad): |
|
540 |
"""Make a pass over the list of instances, restarting downed ones. |
|
541 |
|
|
542 |
""" |
|
543 |
notepad.MaintainInstanceList(self.instances.keys()) |
|
544 |
|
|
545 |
for instance in self.instances.values(): |
|
546 |
if instance.state in BAD_STATES: |
|
547 |
n = notepad.NumberOfRestartAttempts(instance) |
|
548 |
|
|
549 |
if n > MAXTRIES: |
|
550 |
logging.warning("Not restarting instance %s, retries exhausted", |
|
551 |
instance.name) |
|
552 |
continue |
|
553 |
elif n < MAXTRIES: |
|
554 |
last = " (Attempt #%d)" % (n + 1) |
|
555 |
else: |
|
556 |
notepad.RecordRestartAttempt(instance) |
|
557 |
logging.error("Could not restart %s after %d attempts, giving up", |
|
558 |
instance.name, MAXTRIES) |
|
559 |
continue |
|
560 |
try: |
|
561 |
logging.info("Restarting %s%s", |
|
562 |
instance.name, last) |
|
563 |
instance.Restart() |
|
564 |
self.started_instances.add(instance.name) |
|
565 |
except Exception: # pylint: disable-msg=W0703 |
|
566 |
logging.exception("Error while restarting instance %s", |
|
567 |
instance.name) |
|
568 |
|
|
569 |
notepad.RecordRestartAttempt(instance) |
|
570 |
elif instance.state in HELPLESS_STATES: |
|
571 |
if notepad.NumberOfRestartAttempts(instance): |
|
572 |
notepad.RemoveInstance(instance) |
|
573 |
else: |
|
574 |
if notepad.NumberOfRestartAttempts(instance): |
|
575 |
notepad.RemoveInstance(instance) |
|
576 |
logging.info("Restart of %s succeeded", instance.name) |
|
577 |
|
|
578 |
@staticmethod |
|
579 |
def VerifyDisks(): |
|
580 |
"""Run gnt-cluster verify-disks. |
|
581 |
|
|
582 |
""" |
|
583 |
op = opcodes.OpVerifyDisks() |
|
584 |
job_id = client.SubmitJob([op]) |
|
585 |
result = cli.PollJob(job_id, cl=client, feedback_fn=logging.debug)[0] |
|
586 |
client.ArchiveJob(job_id) |
|
587 |
if not isinstance(result, (tuple, list)): |
|
588 |
logging.error("Can't get a valid result from verify-disks") |
|
589 |
return |
|
590 |
offline_disk_instances = result[2] |
|
591 |
if not offline_disk_instances: |
|
592 |
# nothing to do |
|
593 |
return |
|
594 |
logging.debug("Will activate disks for instances %s", |
|
595 |
utils.CommaJoin(offline_disk_instances)) |
|
596 |
# we submit only one job, and wait for it. not optimal, but spams |
|
597 |
# less the job queue |
|
598 |
job = [opcodes.OpActivateInstanceDisks(instance_name=name) |
|
599 |
for name in offline_disk_instances] |
|
600 |
job_id = cli.SendJob(job, cl=client) |
|
601 |
|
|
602 |
try: |
|
603 |
cli.PollJob(job_id, cl=client, feedback_fn=logging.debug) |
|
604 |
except Exception: # pylint: disable-msg=W0703 |
|
605 |
logging.exception("Error while activating disks") |
|
606 |
|
|
607 |
|
|
608 |
def OpenStateFile(path): |
|
609 |
"""Opens the state file and acquires a lock on it. |
|
610 |
|
|
611 |
@type path: string |
|
612 |
@param path: Path to state file |
|
613 |
|
|
614 |
""" |
|
615 |
# The two-step dance below is necessary to allow both opening existing |
|
616 |
# file read/write and creating if not existing. Vanilla open will truncate |
|
617 |
# an existing file -or- allow creating if not existing. |
|
618 |
statefile_fd = os.open(path, os.O_RDWR | os.O_CREAT) |
|
619 |
|
|
620 |
# Try to acquire lock on state file. If this fails, another watcher instance |
|
621 |
# might already be running or another program is temporarily blocking the |
|
622 |
# watcher from running. |
|
623 |
try: |
|
624 |
utils.LockFile(statefile_fd) |
|
625 |
except errors.LockError, err: |
|
626 |
logging.error("Can't acquire lock on state file %s: %s", path, err) |
Also available in: Unified diff