Joshua M. Boniface
1b6613c280
Sets in the node daemon, returns via the API, and shows in the CLI, information about the live VNC listen address and port for VNC-enabled VMs. Closes #115
814 lines
38 KiB
Python
814 lines
38 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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from xml.etree import ElementTree
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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, this_node=None):
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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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if this_node is not None and zkhandler.readdata(zk_conn, '/domains/{}/state'.format(dom_uuid)) != 'stop' and lock['address'].split(':')[0] != this_node.storage_ipaddr:
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logger.out('RBD lock does not belong to this host (lock owner: {}): freeing this lock would be unsafe, aborting'.format(lock['address'].split(':')[0], state='e'))
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zkhandler.writedata(zk_conn, {'/domains/{}/state'.format(dom_uuid): 'fail'})
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zkhandler.writedata(zk_conn, {'/domains/{}/failedreason'.format(dom_uuid): 'Could not safely free RBD lock {} ({}) on volume {}; stop VM and flush locks manually'.format(lock['id'], lock['address'], rbd)})
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break
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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 "{}": {}'.format(lock['id'], rbd, lock_remove_stderr), state='e')
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zkhandler.writedata(zk_conn, {'/domains/{}/state'.format(dom_uuid): 'fail'})
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zkhandler.writedata(zk_conn, {'/domains/{}/failedreason'.format(dom_uuid): 'Could not free RBD lock {} ({}) on volume {}: {}'.format(lock['id'], lock['address'], rbd, lock_remove_stderr)})
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break
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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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# Verify that the VM is set to run on this node
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if this_node.d_domain[dom_uuid].getnode() == this_node.name:
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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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# Flush the lock
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result = flush_locks(zk_conn, logger, dom_uuid, this_node)
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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 Exception:
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self.pinpolicy = "none"
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try:
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self.migration_method = zkhandler.readdata(self.zk_conn, '/domains/{}/migration_method'.format(self.domuuid))
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except Exception:
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self.migration_method = '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 Exception:
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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 Exception:
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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 self.domuuid not 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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# Update the VNC live data
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def update_vnc(self):
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if self.dom is not None:
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live_xml = ElementTree.fromstring(self.dom.XMLDesc(0))
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graphics = live_xml.find('./devices/graphics')
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if graphics is not None:
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self.logger.out('Updating VNC data', state='i', prefix='Domain {}'.format(self.domuuid))
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port = graphics.get('port', '')
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listen = graphics.get('listen', '')
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zkhandler.writedata(self.zk_conn, {'/domains/{}/vnc'.format(self.domuuid): '{}:{}'.format(listen, port)})
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else:
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zkhandler.writedata(self.zk_conn, {'/domains/{}/vnc'.format(self.domuuid): ''})
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else:
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zkhandler.writedata(self.zk_conn, {'/domains/{}/vnc'.format(self.domuuid): ''})
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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 is 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 Exception:
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curstate = 'notstart'
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# Handle situations where the VM crashed or the node unexpectedly rebooted
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if self.getdom() is None or self.getdom().state()[0] != libvirt.VIR_DOMAIN_RUNNING:
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# Flush locks
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self.logger.out('Flushing RBD locks', state='i', prefix='Domain {}'.format(self.domuuid))
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flush_locks(self.zk_conn, self.logger, self.domuuid, self.this_node)
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if zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid)) == 'fail':
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lv_conn.close()
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self.dom = None
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self.instart = False
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return
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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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lv_conn.close()
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self.dom = None
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self.instart = False
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return
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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 is 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 is 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 Exception:
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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, force_shutdown=False):
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# Wait for any previous migration
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while self.inmigrate:
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time.sleep(0.1)
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if self.migration_method == 'live':
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force_live = True
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elif self.migration_method == 'shutdown':
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force_shutdown = True
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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.inmigrate = False
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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))
|
|
if zkhandler.readdata(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid)) == '':
|
|
self.logger.out('Waiting for peer', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
ticks = 0
|
|
while zkhandler.readdata(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid)) == '':
|
|
time.sleep(0.1)
|
|
ticks += 1
|
|
if ticks > 300:
|
|
self.logger.out('Timed out waiting 30s for peer', state='e', prefix='Domain {}'.format(self.domuuid))
|
|
aborted = True
|
|
break
|
|
self.logger.out('Releasing read lock for synchronization phase A', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization phase A', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
if aborted:
|
|
abort_migrate('Timed out waiting for peer')
|
|
return
|
|
|
|
# Synchronize nodes B (I am writer)
|
|
lock = zkhandler.writelock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring write lock for synchronization phase B', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
self.logger.out('Acquired write lock for synchronization phase B', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
time.sleep(0.5) # Time fir reader to acquire the lock
|
|
|
|
def migrate_live():
|
|
self.logger.out('Setting up live migration', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
# Set up destination connection
|
|
dest_lv = 'qemu+tcp://{}.{}/system'.format(self.node, self.config['cluster_domain'])
|
|
dest_tcp = 'tcp://{}.{}'.format(self.node, self.config['cluster_domain'])
|
|
try:
|
|
self.logger.out('Opening remote libvirt connection', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
# Open a connection to the destination
|
|
dest_lv_conn = libvirt.open(dest_lv)
|
|
if not dest_lv_conn:
|
|
raise
|
|
except Exception:
|
|
self.logger.out('Failed to open connection to {}; aborting live migration.'.format(dest_lv), state='e', prefix='Domain {}'.format(self.domuuid))
|
|
return False
|
|
|
|
try:
|
|
self.logger.out('Live migrating VM', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
# Send the live migration; force the destination URI to ensure we transit over the cluster network
|
|
target_dom = self.dom.migrate(dest_lv_conn, libvirt.VIR_MIGRATE_LIVE, None, dest_tcp, 0)
|
|
if not target_dom:
|
|
raise
|
|
except Exception as e:
|
|
self.logger.out('Failed to send VM to {} - aborting live migration; error: {}'.format(dest_lv, e), state='e', prefix='Domain {}'.format(self.domuuid))
|
|
dest_lv_conn.close()
|
|
return False
|
|
|
|
self.logger.out('Successfully migrated VM', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
dest_lv_conn.close()
|
|
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
|
|
|
|
if not force_shutdown:
|
|
# 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
|
|
else:
|
|
migrate_live_result = False
|
|
|
|
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', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
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 fir reader to acquire the lock
|
|
|
|
if do_migrate_shutdown:
|
|
migrate_shutdown()
|
|
|
|
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', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# 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.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 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 for the receive side to complete before we declare all-done and release locks
|
|
while zkhandler.readdata(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid)) != '':
|
|
time.sleep(0.5)
|
|
migrate_lock_node.release()
|
|
migrate_lock_state.release()
|
|
|
|
self.inmigrate = False
|
|
return
|
|
|
|
# Receive the migration from another host
|
|
def receive_migrate(self):
|
|
# Wait for any previous migration
|
|
while self.inreceive:
|
|
time.sleep(0.1)
|
|
|
|
self.inreceive = 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 fir 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 fir 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 fir 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.node == self.this_node.name:
|
|
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 or was aborted
|
|
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))
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization phase D', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
zkhandler.writedata(self.zk_conn, {'/locks/domain_migrate/{}'.format(self.domuuid): ''})
|
|
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 is not None:
|
|
running, reason = self.dom.state()
|
|
else:
|
|
raise
|
|
except Exception:
|
|
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 is False \
|
|
and self.inrestart is False \
|
|
and self.inmigrate is False \
|
|
and self.inreceive is False \
|
|
and self.inshutdown is False \
|
|
and self.instop is 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()
|
|
# Update the VNC information
|
|
self.update_vnc()
|
|
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 is 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 Exception:
|
|
dom = None
|
|
|
|
# After everything
|
|
finally:
|
|
# Close the libvirt connection
|
|
if lv_conn is not None:
|
|
lv_conn.close()
|
|
|
|
# Return the dom object (or None)
|
|
return dom
|