root / lib / watcher / nodemaint.py @ 194f0764
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# Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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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"""Module doing node maintenance for Ganeti watcher.
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"""
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import logging |
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from ganeti import constants |
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from ganeti import errors |
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from ganeti import hypervisor |
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from ganeti import netutils |
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from ganeti import ssconf |
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from ganeti import utils |
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from ganeti import confd |
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from ganeti.storage import drbd |
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import ganeti.confd.client # pylint: disable=W0611 |
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class NodeMaintenance(object): |
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"""Talks to confd daemons and possible shutdown instances/drbd devices.
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"""
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def __init__(self): |
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self.store_cb = confd.client.StoreResultCallback()
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self.filter_cb = confd.client.ConfdFilterCallback(self.store_cb) |
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self.confd_client = confd.client.GetConfdClient(self.filter_cb) |
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@staticmethod
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def ShouldRun(): |
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"""Checks whether node maintenance should run.
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"""
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try:
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return ssconf.SimpleStore().GetMaintainNodeHealth()
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except errors.ConfigurationError, err:
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logging.error("Configuration error, not activating node maintenance: %s",
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err) |
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return False |
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@staticmethod
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def GetRunningInstances(): |
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"""Compute list of hypervisor/running instances.
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"""
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hyp_list = ssconf.SimpleStore().GetHypervisorList() |
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hvparams = ssconf.SimpleStore().GetHvparams() |
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results = [] |
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for hv_name in hyp_list: |
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try:
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hv = hypervisor.GetHypervisor(hv_name) |
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ilist = hv.ListInstances(hvparams=hvparams) |
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results.extend([(iname, hv_name) for iname in ilist]) |
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except: # pylint: disable=W0702 |
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logging.error("Error while listing instances for hypervisor %s",
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hv_name, exc_info=True)
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return results
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@staticmethod
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def GetUsedDRBDs(): |
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"""Get list of used DRBD minors.
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"""
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return drbd.DRBD8.GetUsedDevs()
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@classmethod
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def DoMaintenance(cls, role): |
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"""Maintain the instance list.
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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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else:
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logging.debug("Not doing anything for role %s", role)
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@staticmethod
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def ShutdownInstances(inst_running): |
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"""Shutdown running instances.
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"""
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names_running = set([i[0] for i in inst_running]) |
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if names_running:
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logging.info("Following instances should not be running,"
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" shutting them down: %s", utils.CommaJoin(names_running))
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# 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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i2h = dict(inst_running)
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for name in names_running: |
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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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@staticmethod
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def ShutdownDRBD(drbd_running): |
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"""Shutdown active DRBD devices.
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"""
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if drbd_running:
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logging.info("Following DRBD minors should not be active,"
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" shutting them down: %s", utils.CommaJoin(drbd_running))
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for minor in drbd_running: |
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drbd.DRBD8.ShutdownAll(minor) |
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def Exec(self): |
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"""Check node status versus cluster desired state.
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"""
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if not constants.ENABLE_CONFD: |
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logging.warning("Confd use not enabled, cannot do maintenance")
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return
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my_name = netutils.Hostname.GetSysName() |
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req = \ |
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confd.client.ConfdClientRequest(type=constants.CONFD_REQ_NODE_ROLE_BYNAME, |
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query=my_name) |
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self.confd_client.SendRequest(req, async=False, coverage=-1) |
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timed_out, _, _ = self.confd_client.WaitForReply(req.rsalt)
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if not timed_out: |
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# should have a valid response
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status, result = self.store_cb.GetResponse(req.rsalt)
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assert status, "Missing result but received replies" |
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if not self.filter_cb.consistent[req.rsalt]: |
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logging.warning("Inconsistent replies, not doing anything")
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return
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self.DoMaintenance(result.server_reply.answer)
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else:
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logging.warning("Confd query timed out, cannot do maintenance actions")
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