Joshua M. Boniface
351076c15e
Avoids situations where two migrates, to different nodes, happen in rapid succession. Aborts the migration if the current target node no longer matches what was set at the start of the execution.
757 lines
34 KiB
Python
757 lines
34 KiB
Python
#!/usr/bin/env python3
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# VMInstance.py - Class implementing a PVC virtual machine in pvcnoded
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2020 Joshua M. Boniface <joshua@boniface.me>
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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 3 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,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU 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, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import uuid
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import time
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import libvirt
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import json
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from threading import Thread
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import pvcnoded.log as log
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import pvcnoded.zkhandler as zkhandler
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import pvcnoded.common as common
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import pvcnoded.VMConsoleWatcherInstance as VMConsoleWatcherInstance
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import daemon_lib.common as daemon_common
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def flush_locks(zk_conn, logger, dom_uuid):
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logger.out('Flushing RBD locks for VM "{}"'.format(dom_uuid), state='i')
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# Get the list of RBD images
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rbd_list = zkhandler.readdata(zk_conn, '/domains/{}/rbdlist'.format(dom_uuid)).split(',')
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for rbd in rbd_list:
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# Check if a lock exists
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lock_list_retcode, lock_list_stdout, lock_list_stderr = common.run_os_command('rbd lock list --format json {}'.format(rbd))
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if lock_list_retcode != 0:
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logger.out('Failed to obtain lock list for volume "{}"'.format(rbd), state='e')
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continue
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try:
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lock_list = json.loads(lock_list_stdout)
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except Exception as e:
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logger.out('Failed to parse lock list for volume "{}": {}'.format(rbd, e), state='e')
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continue
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# If there's at least one lock
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if lock_list:
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# Loop through the locks
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for lock in lock_list:
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# Free the lock
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lock_remove_retcode, lock_remove_stdout, lock_remove_stderr = common.run_os_command('rbd lock remove {} "{}" "{}"'.format(rbd, lock['id'], lock['locker']))
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if lock_remove_retcode != 0:
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logger.out('Failed to free RBD lock "{}" on volume "{}"\n{}'.format(lock['id'], rbd, lock_remove_stderr), state='e')
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continue
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logger.out('Freed RBD lock "{}" on volume "{}"'.format(lock['id'], rbd), state='o')
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return True
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# Primary command function
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def run_command(zk_conn, logger, this_node, data):
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# Get the command and args
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command, args = data.split()
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# Flushing VM RBD locks
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if command == 'flush_locks':
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dom_uuid = args
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# If this node is taking over primary state, wait until it's done
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while this_node.router_state == 'takeover':
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time.sleep(1)
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if this_node.router_state == 'primary':
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# Lock the command queue
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zk_lock = zkhandler.writelock(zk_conn, '/cmd/domains')
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with zk_lock:
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# Add the OSD
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result = flush_locks(zk_conn, logger, dom_uuid)
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# Command succeeded
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if result:
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# Update the command queue
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zkhandler.writedata(zk_conn, {'/cmd/domains': 'success-{}'.format(data)})
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# Command failed
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else:
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# Update the command queue
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zkhandler.writedata(zk_conn, {'/cmd/domains': 'failure-{}'.format(data)})
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# Wait 1 seconds before we free the lock, to ensure the client hits the lock
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time.sleep(1)
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class VMInstance(object):
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# Initialization function
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def __init__(self, domuuid, zk_conn, config, logger, this_node):
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# Passed-in variables on creation
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self.domuuid = domuuid
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self.zk_conn = zk_conn
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self.config = config
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self.logger = logger
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self.this_node = this_node
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# Get data from zookeeper
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self.domname = zkhandler.readdata(zk_conn, '/domains/{}'.format(domuuid))
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self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
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self.node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
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self.lastnode = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(self.domuuid))
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self.last_currentnode = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
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self.last_lastnode = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(self.domuuid))
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try:
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self.pinpolicy = zkhandler.readdata(self.zk_conn, '/domains/{}/pinpolicy'.format(self.domuuid))
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except:
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self.pinpolicy = "None"
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# These will all be set later
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self.instart = False
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self.inrestart = False
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self.inmigrate = False
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self.inreceive = False
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self.inshutdown = False
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self.instop = False
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# Libvirt domuuid
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self.dom = self.lookupByUUID(self.domuuid)
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# Log watcher instance
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self.console_log_instance = VMConsoleWatcherInstance.VMConsoleWatcherInstance(self.domuuid, self.domname, self.zk_conn, self.config, self.logger, self.this_node)
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# Watch for changes to the state field in Zookeeper
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@self.zk_conn.DataWatch('/domains/{}/state'.format(self.domuuid))
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def watch_state(data, stat, event=""):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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# Perform a management command
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self.logger.out('Updating state of VM {}'.format(self.domuuid), state='i')
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state_thread = Thread(target=self.manage_vm_state, args=(), kwargs={})
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state_thread.start()
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# Get data functions
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def getstate(self):
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return self.state
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def getnode(self):
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return self.node
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def getlastnode(self):
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return self.lastnode
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def getdom(self):
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return self.dom
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def getmemory(self):
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try:
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if self.dom is not None:
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memory = int(self.dom.info()[2] / 1024)
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else:
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domain_information = daemon_common.getInformationFromXML(self.zk_conn, self.domuuid)
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memory = int(domain_information['memory'])
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except:
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memory = 0
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return memory
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def getvcpus(self):
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try:
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vcpus = int(self.dom.info()[3])
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except:
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vcpus = 0
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return vcpus
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# Manage local node domain_list
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def addDomainToList(self):
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if not self.domuuid in self.this_node.domain_list:
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try:
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# Add the domain to the domain_list array
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self.this_node.domain_list.append(self.domuuid)
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# Push the change up to Zookeeper
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.this_node.name): ' '.join(self.this_node.domain_list) })
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except Exception as e:
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self.logger.out('Error adding domain to list: {}'.format(e), state='e')
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def removeDomainFromList(self):
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if self.domuuid in self.this_node.domain_list:
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try:
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# Remove the domain from the domain_list array
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self.this_node.domain_list.remove(self.domuuid)
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# Push the change up to Zookeeper
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.this_node.name): ' '.join(self.this_node.domain_list) })
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except Exception as e:
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self.logger.out('Error removing domain from list: {}'.format(e), state='e')
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# Start up the VM
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def start_vm(self):
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# Start the log watcher
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self.console_log_instance.start()
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self.logger.out('Starting VM', state='i', prefix='Domain {}'.format(self.domuuid))
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self.instart = True
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# Start up a new Libvirt connection
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libvirt_name = "qemu:///system"
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lv_conn = libvirt.open(libvirt_name)
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if lv_conn == None:
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self.logger.out('Failed to open local libvirt connection', state='e', prefix='Domain {}'.format(self.domuuid))
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self.instart = False
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return
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# Try to get the current state in case it's already running
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try:
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self.dom = self.lookupByUUID(self.domuuid)
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curstate = self.dom.state()[0]
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except:
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curstate = 'notstart'
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if curstate == libvirt.VIR_DOMAIN_RUNNING:
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# If it is running just update the model
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self.addDomainToList()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): '' })
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else:
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# Or try to create it
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try:
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# Grab the domain information from Zookeeper
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xmlconfig = zkhandler.readdata(self.zk_conn, '/domains/{}/xml'.format(self.domuuid))
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dom = lv_conn.createXML(xmlconfig, 0)
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self.addDomainToList()
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self.logger.out('Successfully started VM', state='o', prefix='Domain {}'.format(self.domuuid))
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self.dom = dom
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zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): '' })
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except libvirt.libvirtError as e:
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self.logger.out('Failed to create VM', state='e', prefix='Domain {}'.format(self.domuuid))
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'fail' })
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zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): str(e) })
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self.dom = None
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lv_conn.close()
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self.instart = False
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# Restart the VM
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def restart_vm(self):
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self.logger.out('Restarting VM', state='i', prefix='Domain {}'.format(self.domuuid))
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self.inrestart = True
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# Start up a new Libvirt connection
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libvirt_name = "qemu:///system"
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lv_conn = libvirt.open(libvirt_name)
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if lv_conn == None:
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self.logger.out('Failed to open local libvirt connection', state='e', prefix='Domain {}'.format(self.domuuid))
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self.inrestart = False
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return
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self.shutdown_vm()
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time.sleep(0.2)
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self.start_vm()
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self.addDomainToList()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
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lv_conn.close()
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self.inrestart = False
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# Stop the VM forcibly without updating state
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def terminate_vm(self):
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self.logger.out('Terminating VM', state='i', prefix='Domain {}'.format(self.domuuid))
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self.instop = True
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try:
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self.dom.destroy()
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except AttributeError:
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self.logger.out('Failed to terminate VM', state='e', prefix='Domain {}'.format(self.domuuid))
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self.removeDomainFromList()
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self.logger.out('Successfully terminated VM', state='o', prefix='Domain {}'.format(self.domuuid))
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self.dom = None
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self.instop = False
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# Stop the log watcher
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self.console_log_instance.stop()
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# Stop the VM forcibly
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def stop_vm(self):
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self.logger.out('Forcibly stopping VM', state='i', prefix='Domain {}'.format(self.domuuid))
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self.instop = True
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try:
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self.dom.destroy()
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except AttributeError:
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self.logger.out('Failed to stop VM', state='e', prefix='Domain {}'.format(self.domuuid))
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self.removeDomainFromList()
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if self.inrestart == False:
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
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self.logger.out('Successfully stopped VM', state='o', prefix='Domain {}'.format(self.domuuid))
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self.dom = None
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self.instop = False
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# Stop the log watcher
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self.console_log_instance.stop()
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# Shutdown the VM gracefully
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def shutdown_vm(self):
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self.logger.out('Gracefully stopping VM', state='i', prefix='Domain {}'.format(self.domuuid))
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is_aborted = False
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self.inshutdown = True
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self.dom.shutdown()
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tick = 0
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while True:
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tick += 1
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time.sleep(1)
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# Abort shutdown if the state changes to start
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current_state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
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if current_state not in ['shutdown', 'restart']:
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self.logger.out('Aborting VM shutdown due to state change', state='i', prefix='Domain {}'.format(self.domuuid))
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is_aborted = True
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break
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try:
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lvdomstate = self.dom.state()[0]
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except:
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lvdomstate = None
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if lvdomstate != libvirt.VIR_DOMAIN_RUNNING:
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self.removeDomainFromList()
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
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self.logger.out('Successfully shutdown VM', state='o', prefix='Domain {}'.format(self.domuuid))
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self.dom = None
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# Stop the log watcher
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self.console_log_instance.stop()
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break
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if tick >= self.config['vm_shutdown_timeout']:
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self.logger.out('Shutdown timeout ({}s) expired, forcing off'.format(self.config['vm_shutdown_timeout']), state='e', prefix='Domain {}'.format(self.domuuid))
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
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break
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self.inshutdown = False
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if is_aborted:
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self.manage_vm_state()
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if self.inrestart:
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# Wait to prevent race conditions
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time.sleep(1)
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
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# Migrate the VM to a target host
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def migrate_vm(self, force_live=False):
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self.inmigrate = True
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self.logger.out('Migrating VM to node "{}"'.format(self.node), state='i', prefix='Domain {}'.format(self.domuuid))
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# Used for sanity checking later
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target_node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
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aborted = False
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def abort_migrate(reason):
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zkhandler.writedata(self.zk_conn, {
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'/domains/{}/state'.format(self.domuuid): 'start',
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'/domains/{}/node'.format(self.domuuid): self.this_node.name,
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'/domains/{}/lastnode'.format(self.domuuid): self.last_lastnode
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})
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migrate_lock_node.release()
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migrate_lock_state.release()
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self.logger.out('Aborted migration: {}'.format(reason), state='i', prefix='Domain {}'.format(self.domuuid))
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# Acquire exclusive lock on the domain node key
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migrate_lock_node = zkhandler.exclusivelock(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
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migrate_lock_state = zkhandler.exclusivelock(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
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migrate_lock_node.acquire()
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migrate_lock_state.acquire()
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time.sleep(0.2) # Initial delay for the first writer to grab the lock
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# Don't try to migrate a node to itself, set back to start
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if self.node == self.lastnode or self.node == self.this_node.name:
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abort_migrate('Target node matches the current active node during initial check')
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return
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# Synchronize nodes A (I am reader)
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lock = zkhandler.readlock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
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self.logger.out('Acquiring read lock for synchronization phase A', state='i', prefix='Domain {}'.format(self.domuuid))
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lock.acquire()
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self.logger.out('Acquired read lock for synchronization phase A', state='o', prefix='Domain {}'.format(self.domuuid))
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if zkhandler.readdata(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid)) == '':
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self.logger.out('Waiting for peer', state='i', prefix='Domain {}'.format(self.domuuid))
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ticks = 0
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while zkhandler.readdata(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid)) == '':
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time.sleep(0.1)
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ticks += 1
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if ticks > 300:
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self.logger.out('Timed out waiting 30s for peer', state='e', prefix='Domain {}'.format(self.domuuid))
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aborted = True
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break
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self.logger.out('Releasing read lock for synchronization phase A', state='i', prefix='Domain {}'.format(self.domuuid))
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lock.release()
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self.logger.out('Released read lock for synchronization phase A', state='o', prefix='Domain {}'.format(self.domuuid))
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if aborted:
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abort_migrate('Timed out waiting for peer')
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return
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# Synchronize nodes B (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
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self.logger.out('Acquiring write lock for synchronization phase B', state='i', prefix='Domain {}'.format(self.domuuid))
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization phase B', state='o', prefix='Domain {}'.format(self.domuuid))
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time.sleep(0.5) # Time for reader to acquire the lock
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def migrate_live():
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self.logger.out('Setting up live migration', state='i', prefix='Domain {}'.format(self.domuuid))
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# Set up destination connection
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dest_lv = 'qemu+tcp://{}.{}/system'.format(self.node, self.config['cluster_domain'])
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dest_tcp = 'tcp://{}.{}'.format(self.node, self.config['cluster_domain'])
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try:
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self.logger.out('Opening remote libvirt connection', state='i', prefix='Domain {}'.format(self.domuuid))
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# Open a connection to the destination
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dest_lv_conn = libvirt.open(dest_lv)
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if not dest_lv_conn:
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raise
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except:
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self.logger.out('Failed to open connection to {}; aborting live migration.'.format(dest_lv), state='e', prefix='Domain {}'.format(self.domuuid))
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return False
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try:
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self.logger.out('Live migrating VM', state='i', prefix='Domain {}'.format(self.domuuid))
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# Send the live migration; force the destination URI to ensure we transit over the cluster network
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target_dom = self.dom.migrate(dest_lv_conn, libvirt.VIR_MIGRATE_LIVE, None, dest_tcp, 0)
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if not target_dom:
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raise
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except Exception as e:
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self.logger.out('Failed to send VM to {} - aborting live migration; error: {}'.format(dest_lv, e), state='e', prefix='Domain {}'.format(self.domuuid))
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dest_lv_conn.close()
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return False
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self.logger.out('Successfully migrated VM', state='o', prefix='Domain {}'.format(self.domuuid))
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dest_lv_conn.close()
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|
self.console_log_instance.stop()
|
|
self.removeDomainFromList()
|
|
|
|
return True
|
|
|
|
def migrate_shutdown():
|
|
self.logger.out('Shutting down VM for offline migration', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'shutdown' })
|
|
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid)) != 'stop':
|
|
time.sleep(0.5)
|
|
return True
|
|
|
|
do_migrate_shutdown = False
|
|
migrate_live_result = False
|
|
|
|
# Do a final verification
|
|
if self.node == self.lastnode or self.node == self.this_node.name:
|
|
abort_migrate('Target node matches the current active node during final check')
|
|
return
|
|
if self.node != target_node:
|
|
abort_migrate('Target node changed during preparation')
|
|
return
|
|
|
|
# A live migrate is attemped 3 times in succession
|
|
ticks = 0
|
|
while True:
|
|
ticks += 1
|
|
self.logger.out('Attempting live migration try {}'.format(ticks), state='i', prefix='Domain {}'.format(self.domuuid))
|
|
migrate_live_result = migrate_live()
|
|
if migrate_live_result:
|
|
break
|
|
time.sleep(0.5)
|
|
if ticks > 2:
|
|
break
|
|
|
|
if not migrate_live_result:
|
|
if force_live:
|
|
self.logger.out('Could not live migrate VM while live migration enforced', state='e', prefix='Domain {}'.format(self.domuuid))
|
|
aborted = True
|
|
else:
|
|
do_migrate_shutdown = True
|
|
|
|
self.logger.out('Releasing write lock for synchronization phase B', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization phase B', state='o')
|
|
|
|
if aborted:
|
|
abort_migrate('Live migration failed and is required')
|
|
return
|
|
|
|
# Synchronize nodes C (I am writer)
|
|
lock = zkhandler.writelock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring write lock for synchronization phase C', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired write lock for synchronization phase C', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
time.sleep(0.5) # Time for reader to acquire the lock
|
|
|
|
if do_migrate_shutdown:
|
|
migrate_shutdown_result = migrate_shutdown()
|
|
|
|
self.last_currentnode = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
|
|
self.last_lastnode = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(self.domuuid))
|
|
|
|
migrate_lock_state.release()
|
|
|
|
self.logger.out('Releasing write lock for synchronization phase C', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization phase C', state='o')
|
|
|
|
# Synchronize nodes D (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring read lock for synchronization phase D', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization phase D', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
self.logger.out('Releasing read lock for synchronization phase D', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization phase D', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# Wait 0.5 seconds for everything to stabilize before we declare all-done
|
|
time.sleep(0.5)
|
|
migrate_lock_node.release()
|
|
self.inmigrate = False
|
|
return
|
|
|
|
# Receive the migration from another host
|
|
def receive_migrate(self):
|
|
# Don't try to migrate a node to itself
|
|
if self.node == self.lastnode:
|
|
return
|
|
|
|
self.inreceive = True
|
|
live_receive = True
|
|
|
|
self.logger.out('Receiving VM migration from node "{}"'.format(self.node), state='i', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# Ensure our lock key is populated
|
|
zkhandler.writedata(self.zk_conn, { '/locks/domain_migrate/{}'.format(self.domuuid): self.domuuid })
|
|
|
|
# Synchronize nodes A (I am writer)
|
|
lock = zkhandler.writelock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring write lock for synchronization phase A', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired write lock for synchronization phase A', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
time.sleep(0.5) # Time for reader to acquire the lock
|
|
self.logger.out('Releasing write lock for synchronization phase A', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization phase A', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
time.sleep(0.1) # Time for new writer to acquire the lock
|
|
|
|
# Synchronize nodes B (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring read lock for synchronization phase B', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization phase B', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
self.logger.out('Releasing read lock for synchronization phase B', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization phase B', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# Synchronize nodes C (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring read lock for synchronization phase C', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization phase C', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# Set the updated data
|
|
self.last_currentnode = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
|
|
self.last_lastnode = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(self.domuuid))
|
|
|
|
self.logger.out('Releasing read lock for synchronization phase C', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization phase C', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# Synchronize nodes D (I am writer)
|
|
lock = zkhandler.writelock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring write lock for synchronization phase D', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired write lock for synchronization phase D', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
time.sleep(0.5) # Time for reader to acquire the lock
|
|
|
|
self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
|
|
self.dom = self.lookupByUUID(self.domuuid)
|
|
if self.dom:
|
|
lvdomstate = self.dom.state()[0]
|
|
if lvdomstate == libvirt.VIR_DOMAIN_RUNNING:
|
|
# VM has been received and started
|
|
self.addDomainToList()
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
|
|
self.logger.out('Successfully received migrated VM', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
else:
|
|
# The receive somehow failed
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'fail' })
|
|
else:
|
|
if self.state in ['start']:
|
|
# The receive was aborted
|
|
self.logger.out('Receive aborted via state change', state='w', prefix='Domain {}'.format(self.domuuid))
|
|
elif self.state in ['stop']:
|
|
# The send was shutdown-based
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
|
|
else:
|
|
# The send failed catastrophically
|
|
self.logger.out('Migrate aborted or failed; VM in state {}'.format(self.state), state='w', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
self.logger.out('Releasing write lock for synchronization phase D', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
zkhandler.writedata(self.zk_conn, { '/locks/domain_migrate/{}'.format(self.domuuid): '' })
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization phase D', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
time.sleep(0.1) # Time for new writer to acquire the lock
|
|
|
|
self.inreceive = False
|
|
return
|
|
|
|
#
|
|
# Main function to manage a VM (taking only self)
|
|
#
|
|
def manage_vm_state(self):
|
|
# Update the current values from zookeeper
|
|
self.state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
|
|
self.node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
|
|
self.lastnode = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(self.domuuid))
|
|
|
|
# Check the current state of the VM
|
|
try:
|
|
if self.dom != None:
|
|
running, reason = self.dom.state()
|
|
else:
|
|
raise
|
|
except:
|
|
running = libvirt.VIR_DOMAIN_NOSTATE
|
|
|
|
self.logger.out('VM state change for "{}": {} {}'.format(self.domuuid, self.state, self.node), state='i')
|
|
|
|
#######################
|
|
# Handle state changes
|
|
#######################
|
|
# Valid states are:
|
|
# start
|
|
# migrate
|
|
# migrate-live
|
|
# restart
|
|
# shutdown
|
|
# stop
|
|
# States we don't (need to) handle are:
|
|
# disable
|
|
# provision
|
|
|
|
# Conditional pass one - Are we already performing an action
|
|
if self.instart == False \
|
|
and self.inrestart == False \
|
|
and self.inmigrate == False \
|
|
and self.inreceive == False \
|
|
and self.inshutdown == False \
|
|
and self.instop == False:
|
|
# Conditional pass two - Is this VM configured to run on this node
|
|
if self.node == self.this_node.name:
|
|
# Conditional pass three - Is this VM currently running on this node
|
|
if running == libvirt.VIR_DOMAIN_RUNNING:
|
|
# VM is already running and should be
|
|
if self.state == "start":
|
|
# Start the log watcher
|
|
self.console_log_instance.start()
|
|
# Add domain to running list
|
|
self.addDomainToList()
|
|
# VM is already running and should be but stuck in migrate state
|
|
elif self.state == "migrate" or self.state == "migrate-live":
|
|
# Start the log watcher
|
|
self.console_log_instance.start()
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
|
|
# Add domain to running list
|
|
self.addDomainToList()
|
|
# VM should be restarted
|
|
elif self.state == "restart":
|
|
self.restart_vm()
|
|
# VM should be shut down
|
|
elif self.state == "shutdown":
|
|
self.shutdown_vm()
|
|
# VM should be stopped
|
|
elif self.state == "stop":
|
|
self.stop_vm()
|
|
else:
|
|
# VM should be started
|
|
if self.state == "start":
|
|
# Start the domain
|
|
self.start_vm()
|
|
# VM should be migrated to this node
|
|
elif self.state == "migrate" or self.state == "migrate-live":
|
|
# Receive the migration
|
|
self.receive_migrate()
|
|
# VM should be restarted (i.e. started since it isn't running)
|
|
if self.state == "restart":
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
|
|
# VM should be shut down; ensure it's gone from this node's domain_list
|
|
elif self.state == "shutdown":
|
|
self.removeDomainFromList()
|
|
# Stop the log watcher
|
|
self.console_log_instance.stop()
|
|
# VM should be stoped; ensure it's gone from this node's domain_list
|
|
elif self.state == "stop":
|
|
self.removeDomainFromList()
|
|
# Stop the log watcher
|
|
self.console_log_instance.stop()
|
|
|
|
else:
|
|
# Conditional pass three - Is this VM currently running on this node
|
|
if running == libvirt.VIR_DOMAIN_RUNNING:
|
|
# VM should be migrated away from this node
|
|
if self.state == "migrate":
|
|
self.migrate_vm(force_live=False)
|
|
# VM should be migrated away from this node, live only (no shutdown fallback)
|
|
elif self.state == "migrate-live":
|
|
self.migrate_vm(force_live=True)
|
|
# VM should be shutdown gracefully
|
|
elif self.state == 'shutdown':
|
|
self.shutdown_vm()
|
|
# VM should be forcibly terminated
|
|
else:
|
|
self.terminate_vm()
|
|
|
|
|
|
# This function is a wrapper for libvirt.lookupByUUID which fixes some problems
|
|
# 1. Takes a text UUID and handles converting it to bytes
|
|
# 2. Try's it and returns a sensible value if not
|
|
def lookupByUUID(self, tuuid):
|
|
# Don't do anything if the VM shouldn't live on this node
|
|
if self.node != self.this_node.name:
|
|
return None
|
|
|
|
lv_conn = None
|
|
libvirt_name = "qemu:///system"
|
|
|
|
# Convert the text UUID to bytes
|
|
buuid = uuid.UUID(tuuid).bytes
|
|
|
|
# Try
|
|
try:
|
|
# Open a libvirt connection
|
|
lv_conn = libvirt.open(libvirt_name)
|
|
if lv_conn == None:
|
|
self.logger.out('Failed to open local libvirt connection', state='e', prefix='Domain {}'.format(self.domuuid))
|
|
return None
|
|
|
|
# Lookup the UUID
|
|
dom = lv_conn.lookupByUUID(buuid)
|
|
|
|
# Fail
|
|
except:
|
|
dom = None
|
|
|
|
# After everything
|
|
finally:
|
|
# Close the libvirt connection
|
|
if lv_conn != None:
|
|
lv_conn.close()
|
|
|
|
# Return the dom object (or None)
|
|
return dom
|