Source Code for Module ganeti.watcher.nodemaint

  1  # 
  2  # 
  3   
  4  # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 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  """Module doing node maintenance for Ganeti watcher. 
 23   
 24  """ 
 25   
 26  import logging 
 27   
 28  from ganeti import bdev 
 29  from ganeti import constants 
 30  from ganeti import errors 
 31  from ganeti import hypervisor 
 32  from ganeti import netutils 
 33  from ganeti import ssconf 
 34  from ganeti import utils 
 35  from ganeti import confd 
 36   
 37  import ganeti.confd.client # pylint: disable=W0611 
 38   
 39   
 40 -class NodeMaintenance(object): 
 41    """Talks to confd daemons and possible shutdown instances/drbd devices. 
 42   
 43    """ 
 44 -  def __init__(self): 
 45      self.store_cb = confd.client.StoreResultCallback() 
 46      self.filter_cb = confd.client.ConfdFilterCallback(self.store_cb) 
 47      self.confd_client = confd.client.GetConfdClient(self.filter_cb) 
 48   
 49    @staticmethod 
 50 -  def ShouldRun(): 
 51      """Checks whether node maintenance should run. 
 52   
 53      """ 
 54      try: 
 55        return ssconf.SimpleStore().GetMaintainNodeHealth() 
 56      except errors.ConfigurationError, err: 
 57        logging.error("Configuration error, not activating node maintenance: %s", 
 58                      err) 
 59        return False 
 60   
 61    @staticmethod 
 62 -  def GetRunningInstances(): 
 63      """Compute list of hypervisor/running instances. 
 64   
 65      """ 
 66      hyp_list = ssconf.SimpleStore().GetHypervisorList() 
 67      results = [] 
 68      for hv_name in hyp_list: 
 69        try: 
 70          hv = hypervisor.GetHypervisor(hv_name) 
 71          ilist = hv.ListInstances() 
 72          results.extend([(iname, hv_name) for iname in ilist]) 
 73        except: # pylint: disable=W0702 
 74          logging.error("Error while listing instances for hypervisor %s", 
 75                        hv_name, exc_info=True) 
 76      return results 
 77   
 78    @staticmethod 
 79 -  def GetUsedDRBDs(): 
 80      """Get list of used DRBD minors. 
 81   
 82      """ 
 83      return bdev.DRBD8.GetUsedDevs().keys() 
 84   
 85    @classmethod 
 86 -  def DoMaintenance(cls, role): 
 87      """Maintain the instance list. 
 88   
 89      """ 
 90      if role == constants.CONFD_NODE_ROLE_OFFLINE: 
 91        inst_running = cls.GetRunningInstances() 
 92        cls.ShutdownInstances(inst_running) 
 93        drbd_running = cls.GetUsedDRBDs() 
 94        cls.ShutdownDRBD(drbd_running) 
 95      else: 
 96        logging.debug("Not doing anything for role %s", role) 
 97   
 98    @staticmethod 
 99 -  def ShutdownInstances(inst_running): 
100      """Shutdown running instances. 
101   
102      """ 
103      names_running = set([i[0] for i in inst_running]) 
104      if names_running: 
105        logging.info("Following instances should not be running," 
106                     " shutting them down: %s", utils.CommaJoin(names_running)) 
107        # this dictionary will collapse duplicate instance names (only 
108        # xen pvm/vhm) into a single key, which is fine 
109        i2h = dict(inst_running) 
110        for name in names_running: 
111          hv_name = i2h[name] 
112          hv = hypervisor.GetHypervisor(hv_name) 
113          hv.StopInstance(None, force=True, name=name) 
114   
115    @staticmethod 
116 -  def ShutdownDRBD(drbd_running): 
117      """Shutdown active DRBD devices. 
118   
119      """ 
120      if drbd_running: 
121        logging.info("Following DRBD minors should not be active," 
122                     " shutting them down: %s", utils.CommaJoin(drbd_running)) 
123        for minor in drbd_running: 
124          # pylint: disable=W0212 
125          # using the private method as is, pending enhancements to the DRBD 
126          # interface 
127          bdev.DRBD8._ShutdownAll(minor) 
128   
129 -  def Exec(self): 
130      """Check node status versus cluster desired state. 
131   
132      """ 
133      if not constants.ENABLE_CONFD: 
134        logging.warning("Confd use not enabled, cannot do maintenance") 
135        return 
136   
137      my_name = netutils.Hostname.GetSysName() 
138      req = \ 
139        confd.client.ConfdClientRequest(type=constants.CONFD_REQ_NODE_ROLE_BYNAME, 
140                                        query=my_name) 
141      self.confd_client.SendRequest(req, async=False, coverage=-1) 
142      timed_out, _, _ = self.confd_client.WaitForReply(req.rsalt) 
143      if not timed_out: 
144        # should have a valid response 
145        status, result = self.store_cb.GetResponse(req.rsalt) 
146        assert status, "Missing result but received replies" 
147        if not self.filter_cb.consistent[req.rsalt]: 
148          logging.warning("Inconsistent replies, not doing anything") 
149          return 
150        self.DoMaintenance(result.server_reply.answer) 
151      else: 
152        logging.warning("Confd query timed out, cannot do maintenance actions") 
153