751 lines
34 KiB
Python
751 lines
34 KiB
Python
#!/usr/bin/env python3
|
|
|
|
# VMInstance.py - Class implementing a PVC virtual machine in pvcnoded
|
|
# Part of the Parallel Virtual Cluster (PVC) system
|
|
#
|
|
# Copyright (C) 2018-2020 Joshua M. Boniface <joshua@boniface.me>
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
#
|
|
###############################################################################
|
|
|
|
import uuid
|
|
import time
|
|
import libvirt
|
|
import json
|
|
|
|
from threading import Thread
|
|
|
|
import pvcnoded.log as log
|
|
import pvcnoded.zkhandler as zkhandler
|
|
import pvcnoded.common as common
|
|
|
|
import pvcnoded.VMConsoleWatcherInstance as VMConsoleWatcherInstance
|
|
|
|
import daemon_lib.common as daemon_common
|
|
|
|
def flush_locks(zk_conn, logger, dom_uuid):
|
|
logger.out('Flushing RBD locks for VM "{}"'.format(dom_uuid), state='i')
|
|
# Get the list of RBD images
|
|
rbd_list = zkhandler.readdata(zk_conn, '/domains/{}/rbdlist'.format(dom_uuid)).split(',')
|
|
for rbd in rbd_list:
|
|
# Check if a lock exists
|
|
lock_list_retcode, lock_list_stdout, lock_list_stderr = common.run_os_command('rbd lock list --format json {}'.format(rbd))
|
|
if lock_list_retcode != 0:
|
|
logger.out('Failed to obtain lock list for volume "{}"'.format(rbd), state='e')
|
|
continue
|
|
|
|
try:
|
|
lock_list = json.loads(lock_list_stdout)
|
|
except Exception as e:
|
|
logger.out('Failed to parse lock list for volume "{}": {}'.format(rbd, e), state='e')
|
|
continue
|
|
|
|
# If there's at least one lock
|
|
if lock_list:
|
|
# Loop through the locks
|
|
for lock in lock_list:
|
|
# Free the lock
|
|
lock_remove_retcode, lock_remove_stdout, lock_remove_stderr = common.run_os_command('rbd lock remove {} "{}" "{}"'.format(rbd, lock['id'], lock['locker']))
|
|
if lock_remove_retcode != 0:
|
|
logger.out('Failed to free RBD lock "{}" on volume "{}"\n{}'.format(lock['id'], rbd, lock_remove_stderr), state='e')
|
|
continue
|
|
logger.out('Freed RBD lock "{}" on volume "{}"'.format(lock['id'], rbd), state='o')
|
|
|
|
return True
|
|
|
|
# Primary command function
|
|
def run_command(zk_conn, logger, this_node, data):
|
|
# Get the command and args
|
|
command, args = data.split()
|
|
|
|
# Flushing VM RBD locks
|
|
if command == 'flush_locks':
|
|
dom_uuid = args
|
|
# If this node is taking over primary state, wait until it's done
|
|
while this_node.router_state == 'takeover':
|
|
time.sleep(1)
|
|
if this_node.router_state == 'primary':
|
|
# Lock the command queue
|
|
zk_lock = zkhandler.writelock(zk_conn, '/cmd/domains')
|
|
with zk_lock:
|
|
# Add the OSD
|
|
result = flush_locks(zk_conn, logger, dom_uuid)
|
|
# Command succeeded
|
|
if result:
|
|
# Update the command queue
|
|
zkhandler.writedata(zk_conn, {'/cmd/domains': 'success-{}'.format(data)})
|
|
# Command failed
|
|
else:
|
|
# Update the command queue
|
|
zkhandler.writedata(zk_conn, {'/cmd/domains': 'failure-{}'.format(data)})
|
|
# Wait 1 seconds before we free the lock, to ensure the client hits the lock
|
|
time.sleep(1)
|
|
|
|
class VMInstance(object):
|
|
# Initialization function
|
|
def __init__(self, domuuid, zk_conn, config, logger, this_node):
|
|
# Passed-in variables on creation
|
|
self.domuuid = domuuid
|
|
self.zk_conn = zk_conn
|
|
self.config = config
|
|
self.logger = logger
|
|
self.this_node = this_node
|
|
|
|
# Get data from zookeeper
|
|
self.domname = zkhandler.readdata(zk_conn, '/domains/{}'.format(domuuid))
|
|
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))
|
|
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))
|
|
try:
|
|
self.pinpolicy = zkhandler.readdata(self.zk_conn, '/domains/{}/pinpolicy'.format(self.domuuid))
|
|
except:
|
|
self.pinpolicy = "None"
|
|
|
|
# These will all be set later
|
|
self.instart = False
|
|
self.inrestart = False
|
|
self.inmigrate = False
|
|
self.inreceive = False
|
|
self.inshutdown = False
|
|
self.instop = False
|
|
|
|
# Libvirt domuuid
|
|
self.dom = self.lookupByUUID(self.domuuid)
|
|
|
|
# Log watcher instance
|
|
self.console_log_instance = VMConsoleWatcherInstance.VMConsoleWatcherInstance(self.domuuid, self.domname, self.zk_conn, self.config, self.logger, self.this_node)
|
|
|
|
# Watch for changes to the state field in Zookeeper
|
|
@self.zk_conn.DataWatch('/domains/{}/state'.format(self.domuuid))
|
|
def watch_state(data, stat, event=""):
|
|
if event and event.type == 'DELETED':
|
|
# The key has been deleted after existing before; terminate this watcher
|
|
# because this class instance is about to be reaped in Daemon.py
|
|
return False
|
|
|
|
# Perform a management command
|
|
self.logger.out('Updating state of VM {}'.format(self.domuuid), state='i')
|
|
state_thread = Thread(target=self.manage_vm_state, args=(), kwargs={})
|
|
state_thread.start()
|
|
|
|
# Get data functions
|
|
def getstate(self):
|
|
return self.state
|
|
|
|
def getnode(self):
|
|
return self.node
|
|
|
|
def getlastnode(self):
|
|
return self.lastnode
|
|
|
|
def getdom(self):
|
|
return self.dom
|
|
|
|
def getmemory(self):
|
|
try:
|
|
if self.dom is not None:
|
|
memory = int(self.dom.info()[2] / 1024)
|
|
else:
|
|
domain_information = daemon_common.getInformationFromXML(self.zk_conn, self.domuuid)
|
|
memory = int(domain_information['memory'])
|
|
except:
|
|
memory = 0
|
|
|
|
return memory
|
|
|
|
def getvcpus(self):
|
|
try:
|
|
vcpus = int(self.dom.info()[3])
|
|
except:
|
|
vcpus = 0
|
|
|
|
return vcpus
|
|
|
|
# Manage local node domain_list
|
|
def addDomainToList(self):
|
|
if not self.domuuid in self.this_node.domain_list:
|
|
try:
|
|
# Add the domain to the domain_list array
|
|
self.this_node.domain_list.append(self.domuuid)
|
|
# Push the change up to Zookeeper
|
|
zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.this_node.name): ' '.join(self.this_node.domain_list) })
|
|
except Exception as e:
|
|
self.logger.out('Error adding domain to list: {}'.format(e), state='e')
|
|
|
|
def removeDomainFromList(self):
|
|
if self.domuuid in self.this_node.domain_list:
|
|
try:
|
|
# Remove the domain from the domain_list array
|
|
self.this_node.domain_list.remove(self.domuuid)
|
|
# Push the change up to Zookeeper
|
|
zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.this_node.name): ' '.join(self.this_node.domain_list) })
|
|
except Exception as e:
|
|
self.logger.out('Error removing domain from list: {}'.format(e), state='e')
|
|
|
|
# Start up the VM
|
|
def start_vm(self):
|
|
# Start the log watcher
|
|
self.console_log_instance.start()
|
|
|
|
self.logger.out('Starting VM', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
self.instart = True
|
|
|
|
# Start up a new Libvirt connection
|
|
libvirt_name = "qemu:///system"
|
|
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))
|
|
self.instart = False
|
|
return
|
|
|
|
# Try to get the current state in case it's already running
|
|
try:
|
|
self.dom = self.lookupByUUID(self.domuuid)
|
|
curstate = self.dom.state()[0]
|
|
except:
|
|
curstate = 'notstart'
|
|
|
|
if curstate == libvirt.VIR_DOMAIN_RUNNING:
|
|
# If it is running just update the model
|
|
self.addDomainToList()
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): '' })
|
|
else:
|
|
# Or try to create it
|
|
try:
|
|
# Grab the domain information from Zookeeper
|
|
xmlconfig = zkhandler.readdata(self.zk_conn, '/domains/{}/xml'.format(self.domuuid))
|
|
dom = lv_conn.createXML(xmlconfig, 0)
|
|
self.addDomainToList()
|
|
self.logger.out('Successfully started VM', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
self.dom = dom
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): '' })
|
|
except libvirt.libvirtError as e:
|
|
self.logger.out('Failed to create VM', state='e', prefix='Domain {}'.format(self.domuuid))
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'fail' })
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/failedreason'.format(self.domuuid): str(e) })
|
|
self.dom = None
|
|
|
|
lv_conn.close()
|
|
|
|
self.instart = False
|
|
|
|
# Restart the VM
|
|
def restart_vm(self):
|
|
self.logger.out('Restarting VM', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
self.inrestart = True
|
|
|
|
# Start up a new Libvirt connection
|
|
libvirt_name = "qemu:///system"
|
|
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))
|
|
self.inrestart = False
|
|
return
|
|
|
|
self.shutdown_vm()
|
|
time.sleep(0.2)
|
|
self.start_vm()
|
|
self.addDomainToList()
|
|
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
|
|
lv_conn.close()
|
|
self.inrestart = False
|
|
|
|
# Stop the VM forcibly without updating state
|
|
def terminate_vm(self):
|
|
self.logger.out('Terminating VM', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
self.instop = True
|
|
try:
|
|
self.dom.destroy()
|
|
except AttributeError:
|
|
self.logger.out('Failed to terminate VM', state='e', prefix='Domain {}'.format(self.domuuid))
|
|
self.removeDomainFromList()
|
|
self.logger.out('Successfully terminated VM', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
self.dom = None
|
|
self.instop = False
|
|
|
|
# Stop the log watcher
|
|
self.console_log_instance.stop()
|
|
|
|
# Stop the VM forcibly
|
|
def stop_vm(self):
|
|
self.logger.out('Forcibly stopping VM', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
self.instop = True
|
|
try:
|
|
self.dom.destroy()
|
|
except AttributeError:
|
|
self.logger.out('Failed to stop VM', state='e', prefix='Domain {}'.format(self.domuuid))
|
|
self.removeDomainFromList()
|
|
|
|
if self.inrestart == False:
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
|
|
|
|
self.logger.out('Successfully stopped VM', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
self.dom = None
|
|
self.instop = False
|
|
|
|
# Stop the log watcher
|
|
self.console_log_instance.stop()
|
|
|
|
# Shutdown the VM gracefully
|
|
def shutdown_vm(self):
|
|
self.logger.out('Gracefully stopping VM', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
is_aborted = False
|
|
self.inshutdown = True
|
|
self.dom.shutdown()
|
|
tick = 0
|
|
while True:
|
|
tick += 1
|
|
time.sleep(1)
|
|
|
|
# Abort shutdown if the state changes to start
|
|
current_state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
|
|
if current_state not in ['shutdown', 'restart']:
|
|
self.logger.out('Aborting VM shutdown due to state change', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
is_aborted = True
|
|
break
|
|
|
|
try:
|
|
lvdomstate = self.dom.state()[0]
|
|
except:
|
|
lvdomstate = None
|
|
|
|
if lvdomstate != libvirt.VIR_DOMAIN_RUNNING:
|
|
self.removeDomainFromList()
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
|
|
self.logger.out('Successfully shutdown VM', state='o', prefix='Domain {}'.format(self.domuuid))
|
|
self.dom = None
|
|
# Stop the log watcher
|
|
self.console_log_instance.stop()
|
|
break
|
|
|
|
if tick >= self.config['vm_shutdown_timeout']:
|
|
self.logger.out('Shutdown timeout ({}s) expired, forcing off'.format(self.config['vm_shutdown_timeout']), state='e', prefix='Domain {}'.format(self.domuuid))
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'stop' })
|
|
break
|
|
|
|
self.inshutdown = False
|
|
|
|
if is_aborted:
|
|
self.manage_vm_state()
|
|
|
|
if self.inrestart:
|
|
# Wait to prevent race conditions
|
|
time.sleep(1)
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
|
|
|
|
# Migrate the VM to a target host
|
|
def migrate_vm(self, force_live=False):
|
|
self.inmigrate = True
|
|
self.logger.out('Migrating VM to node "{}"'.format(self.node), state='i', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
aborted = False
|
|
|
|
def abort_migrate(reason):
|
|
zkhandler.writedata(self.zk_conn, {
|
|
'/domains/{}/state'.format(self.domuuid): 'start',
|
|
'/domains/{}/node'.format(self.domuuid): self.this_node.name,
|
|
'/domains/{}/lastnode'.format(self.domuuid): self.last_lastnode
|
|
})
|
|
migrate_lock_node.release()
|
|
migrate_lock_state.release()
|
|
self.logger.out('Aborted migration: {}'.format(reason), state='i', prefix='Domain {}'.format(self.domuuid))
|
|
|
|
# Acquire exclusive lock on the domain node key
|
|
migrate_lock_node = zkhandler.exclusivelock(self.zk_conn, '/domains/{}/node'.format(self.domuuid))
|
|
migrate_lock_state = zkhandler.exclusivelock(self.zk_conn, '/domains/{}/state'.format(self.domuuid))
|
|
migrate_lock_node.acquire()
|
|
migrate_lock_state.acquire()
|
|
|
|
time.sleep(0.2) # Initial delay for the first writer to grab the lock
|
|
|
|
# Don't try to migrate a node to itself, set back to start
|
|
if self.node == self.lastnode or self.node == self.this_node.name:
|
|
abort_migrate('Target node matches the current active node during initial check')
|
|
return
|
|
|
|
# Synchronize nodes A (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/domain_migrate/{}'.format(self.domuuid))
|
|
self.logger.out('Acquiring read lock for synchronization phase A', state='i', prefix='Domain {}'.format(self.domuuid))
|
|
lock.acquire()
|
|
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 for 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:
|
|
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
|
|
|
|
# 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
|