Source Code for Module ganeti.watcher.nodemaint

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 29   
 30   
 31  """Module doing node maintenance for Ganeti watcher. 
 32   
 33  """ 
 34   
 35  import logging 
 36   
 37  from ganeti import constants 
 38  from ganeti import errors 
 39  from ganeti import hypervisor 
 40  from ganeti import netutils 
 41  from ganeti import ssconf 
 42  from ganeti import utils 
 43  from ganeti import confd 
 44  from ganeti.storage import drbd 
 45   
 46  import ganeti.confd.client # pylint: disable=W0611 
 47   
 48   
 49 -class NodeMaintenance(object): 
 50    """Talks to confd daemons and possible shutdown instances/drbd devices. 
 51   
 52    """ 
 53 -  def __init__(self): 
 54      self.store_cb = confd.client.StoreResultCallback() 
 55      self.filter_cb = confd.client.ConfdFilterCallback(self.store_cb) 
 56      self.confd_client = confd.client.GetConfdClient(self.filter_cb) 
 57   
 58    @staticmethod 
 59 -  def ShouldRun(): 
 60      """Checks whether node maintenance should run. 
 61   
 62      """ 
 63      try: 
 64        return ssconf.SimpleStore().GetMaintainNodeHealth() 
 65      except errors.ConfigurationError, err: 
 66        logging.error("Configuration error, not activating node maintenance: %s", 
 67                      err) 
 68        return False 
 69   
 70    @staticmethod 
 71 -  def GetRunningInstances(): 
 72      """Compute list of hypervisor/running instances. 
 73   
 74      """ 
 75      hyp_list = ssconf.SimpleStore().GetHypervisorList() 
 76      hvparams = ssconf.SimpleStore().GetHvparams() 
 77      results = [] 
 78      for hv_name in hyp_list: 
 79        try: 
 80          hv = hypervisor.GetHypervisor(hv_name) 
 81          ilist = hv.ListInstances(hvparams=hvparams) 
 82          results.extend([(iname, hv_name) for iname in ilist]) 
 83        except: # pylint: disable=W0702 
 84          logging.error("Error while listing instances for hypervisor %s", 
 85                        hv_name, exc_info=True) 
 86      return results 
 87   
 88    @staticmethod 
 89 -  def GetUsedDRBDs(): 
 90      """Get list of used DRBD minors. 
 91   
 92      """ 
 93      return drbd.DRBD8.GetUsedDevs() 
 94   
 95    @classmethod 
 96 -  def DoMaintenance(cls, role): 
 97      """Maintain the instance list. 
 98   
 99      """ 
100      if role == constants.CONFD_NODE_ROLE_OFFLINE: 
101        inst_running = cls.GetRunningInstances() 
102        cls.ShutdownInstances(inst_running) 
103        drbd_running = cls.GetUsedDRBDs() 
104        cls.ShutdownDRBD(drbd_running) 
105      else: 
106        logging.debug("Not doing anything for role %s", role) 
107   
108    @staticmethod 
109 -  def ShutdownInstances(inst_running): 
110      """Shutdown running instances. 
111   
112      """ 
113      names_running = set([i[0] for i in inst_running]) 
114      if names_running: 
115        logging.info("Following instances should not be running," 
116                     " shutting them down: %s", utils.CommaJoin(names_running)) 
117        # this dictionary will collapse duplicate instance names (only 
118        # xen pvm/vhm) into a single key, which is fine 
119        i2h = dict(inst_running) 
120        for name in names_running: 
121          hv_name = i2h[name] 
122          hv = hypervisor.GetHypervisor(hv_name) 
123          hv.StopInstance(None, force=True, name=name) 
124   
125    @staticmethod 
126 -  def ShutdownDRBD(drbd_running): 
127      """Shutdown active DRBD devices. 
128   
129      """ 
130      if drbd_running: 
131        logging.info("Following DRBD minors should not be active," 
132                     " shutting them down: %s", utils.CommaJoin(drbd_running)) 
133        for minor in drbd_running: 
134          drbd.DRBD8.ShutdownAll(minor) 
135   
136 -  def Exec(self): 
137      """Check node status versus cluster desired state. 
138   
139      """ 
140      if not constants.ENABLE_CONFD: 
141        logging.warning("Confd use not enabled, cannot do maintenance") 
142        return 
143   
144      my_name = netutils.Hostname.GetSysName() 
145      req = \ 
146        confd.client.ConfdClientRequest(type=constants.CONFD_REQ_NODE_ROLE_BYNAME, 
147                                        query=my_name) 
148      self.confd_client.SendRequest(req, async=False, coverage=-1) 
149      timed_out, _, _ = self.confd_client.WaitForReply(req.rsalt) 
150      if not timed_out: 
151        # should have a valid response 
152        status, result = self.store_cb.GetResponse(req.rsalt) 
153        assert status, "Missing result but received replies" 
154        if not self.filter_cb.consistent[req.rsalt]: 
155          logging.warning("Inconsistent replies, not doing anything") 
156          return 
157        self.DoMaintenance(result.server_reply.answer) 
158      else: 
159        logging.warning("Confd query timed out, cannot do maintenance actions") 
160