1001 lines
35 KiB
Python
1001 lines
35 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) 2018-2022 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, version 3.
|
|
#
|
|
# 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
|
|
|
|
from threading import Thread
|
|
from xml.etree import ElementTree
|
|
from json import loads as jloads
|
|
|
|
import daemon_lib.common as common
|
|
|
|
import pvcnoded.objects.VMConsoleWatcherInstance as VMConsoleWatcherInstance
|
|
|
|
|
|
class VMInstance(object):
|
|
# Initialization function
|
|
def __init__(self, domuuid, zkhandler, config, logger, this_node):
|
|
# Passed-in variables on creation
|
|
self.domuuid = domuuid
|
|
self.zkhandler = zkhandler
|
|
self.config = config
|
|
self.logger = logger
|
|
self.this_node = this_node
|
|
|
|
# Get data from zookeeper
|
|
self.domname = self.zkhandler.read(("domain", domuuid))
|
|
self.state = self.zkhandler.read(("domain.state", domuuid))
|
|
self.node = self.zkhandler.read(("domain.node", domuuid))
|
|
self.lastnode = self.zkhandler.read(("domain.last_node", domuuid))
|
|
self.last_currentnode = self.zkhandler.read(("domain.node", domuuid))
|
|
self.last_lastnode = self.zkhandler.read(("domain.last_node", domuuid))
|
|
try:
|
|
self.migration_method = self.zkhandler.read(
|
|
("domain.meta.migrate_method", self.domuuid)
|
|
)
|
|
except Exception:
|
|
self.migration_method = "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
|
|
|
|
# State thread
|
|
self.state_thread = None
|
|
|
|
# Libvirt domuuid
|
|
self.dom = self.lookupByUUID(self.domuuid)
|
|
|
|
# Log watcher instance
|
|
self.console_log_instance = VMConsoleWatcherInstance.VMConsoleWatcherInstance(
|
|
self.domuuid,
|
|
self.domname,
|
|
self.zkhandler,
|
|
self.config,
|
|
self.logger,
|
|
self.this_node,
|
|
)
|
|
|
|
# Watch for changes to the state field in Zookeeper
|
|
@self.zkhandler.zk_conn.DataWatch(
|
|
self.zkhandler.schema.path("domain.state", 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")
|
|
self.state_thread = Thread(target=self.manage_vm_state, args=(), kwargs={})
|
|
self.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 = common.getInformationFromXML(
|
|
self.zkhandler, self.domuuid
|
|
)
|
|
memory = int(domain_information["memory"])
|
|
except Exception:
|
|
memory = 0
|
|
|
|
return memory
|
|
|
|
def getvcpus(self):
|
|
try:
|
|
vcpus = int(self.dom.info()[3])
|
|
except Exception:
|
|
vcpus = 0
|
|
|
|
return vcpus
|
|
|
|
# Manage local node domain_list
|
|
def addDomainToList(self):
|
|
if self.domuuid not 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
|
|
self.zkhandler.write(
|
|
[
|
|
(
|
|
("node.running_domains", 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
|
|
self.zkhandler.write(
|
|
[
|
|
(
|
|
("node.running_domains", 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"
|
|
)
|
|
|
|
# Update the VNC live data
|
|
def update_vnc(self):
|
|
if self.dom is not None:
|
|
live_xml = ElementTree.fromstring(self.dom.XMLDesc(0))
|
|
graphics = live_xml.find("./devices/graphics")
|
|
if graphics is not None:
|
|
self.logger.out(
|
|
"Updating VNC data",
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
port = graphics.get("port", "")
|
|
listen = graphics.get("listen", "")
|
|
self.zkhandler.write(
|
|
[
|
|
(
|
|
("domain.console.vnc", self.domuuid),
|
|
"{}:{}".format(listen, port),
|
|
)
|
|
]
|
|
)
|
|
else:
|
|
self.zkhandler.write([(("domain.console.vnc", self.domuuid), "")])
|
|
else:
|
|
self.zkhandler.write([(("domain.console.vnc", self.domuuid), "")])
|
|
|
|
# Attach a device to the running domain
|
|
def attach_device(self, xml_spec):
|
|
if not self.dom:
|
|
self.logger.out(
|
|
"Cannot attach device to non-running domain",
|
|
state="w",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
return False
|
|
|
|
try:
|
|
self.logger.out(
|
|
"Attaching new device to VM",
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
self.dom.attachDevice(xml_spec)
|
|
return True
|
|
except Exception as e:
|
|
self.logger.out(
|
|
"Failed to attach device: {}".format(e),
|
|
state="e",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
return False
|
|
|
|
# Detach a device from the running domain
|
|
def detach_device(self, xml_spec):
|
|
if not self.dom:
|
|
self.logger.out(
|
|
"Cannot detach device from non-running domain",
|
|
state="w",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
return False
|
|
|
|
try:
|
|
self.logger.out(
|
|
"Detaching device from VM",
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
self.dom.detachDevice(xml_spec)
|
|
return True
|
|
except Exception as e:
|
|
self.logger.out(
|
|
"Failed to detach device: {}".format(e),
|
|
state="e",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
return False
|
|
|
|
# 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 is 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 Exception:
|
|
curstate = "notstart"
|
|
|
|
# Handle situations where the VM crashed or the node unexpectedly rebooted
|
|
if (
|
|
self.getdom() is None
|
|
or self.getdom().state()[0] != libvirt.VIR_DOMAIN_RUNNING
|
|
):
|
|
# Flush locks
|
|
self.logger.out(
|
|
"Flushing RBD locks", state="i", prefix="Domain {}".format(self.domuuid)
|
|
)
|
|
|
|
rbd_list = self.zkhandler.read(
|
|
("domain.storage.volumes", self.domuuid)
|
|
).split(",")
|
|
|
|
locks = list()
|
|
for rbd in rbd_list:
|
|
retcode, stdout, stderr = common.run_os_command(
|
|
f"rbd lock list --format json {rbd}"
|
|
)
|
|
if retcode == 0:
|
|
_locks = jloads(stdout)
|
|
for lock in _locks:
|
|
lock["rbd"] = rbd
|
|
locks.append(lock)
|
|
|
|
for lock in locks:
|
|
lockid = lock["id"]
|
|
locker = lock["locker"]
|
|
owner = lock["address"].split(":")[0]
|
|
rbd = lock["rbd"]
|
|
|
|
if owner == self.this_node.storage_ipaddr:
|
|
retcode, stdout, stderr = common.run_os_command(
|
|
f'rbd lock remove {rbd} "{lockid}" "{locker}"'
|
|
)
|
|
else:
|
|
self.logger.out(
|
|
"RBD lock does not belong to this host (owner {owner}) so freeing this long is dangerous; aborting VM start",
|
|
state="e",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
self.zkhandler.write(
|
|
[
|
|
(("domain.state", self.domuuid), "fail"),
|
|
(
|
|
("domain.failed_reason", self.domuuid),
|
|
f"Could not safely free RBD lock {lockid} ({owner}) on volume {rbd}; stop VM and flush locks manually",
|
|
),
|
|
]
|
|
)
|
|
break
|
|
|
|
if self.zkhandler.read(("domain.state", self.domuuid)) == "fail":
|
|
lv_conn.close()
|
|
self.dom = None
|
|
self.instart = False
|
|
return
|
|
|
|
if curstate == libvirt.VIR_DOMAIN_RUNNING:
|
|
# If it is running just update the model
|
|
self.addDomainToList()
|
|
self.zkhandler.write([(("domain.failed_reason", self.domuuid), "")])
|
|
else:
|
|
# Or try to create it
|
|
try:
|
|
# Grab the domain information from Zookeeper
|
|
xmlconfig = self.zkhandler.read(("domain.xml", 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
|
|
self.zkhandler.write([(("domain.failed_reason", self.domuuid), "")])
|
|
except libvirt.libvirtError as e:
|
|
self.logger.out(
|
|
"Failed to create VM",
|
|
state="e",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
self.zkhandler.write(
|
|
[
|
|
(("domain.state", self.domuuid), "fail"),
|
|
(("domain.failed_reason", self.domuuid), str(e)),
|
|
]
|
|
)
|
|
lv_conn.close()
|
|
self.dom = None
|
|
self.instart = False
|
|
return
|
|
|
|
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 is 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()
|
|
|
|
self.zkhandler.write([(("domain.state", 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()
|
|
time.sleep(0.2)
|
|
try:
|
|
if self.getdom().state()[0] == libvirt.VIR_DOMAIN_RUNNING:
|
|
# It didn't terminate, try again
|
|
self.dom.destroy()
|
|
except libvirt.libvirtError:
|
|
pass
|
|
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()
|
|
time.sleep(0.2)
|
|
try:
|
|
if self.getdom().state()[0] == libvirt.VIR_DOMAIN_RUNNING:
|
|
# It didn't terminate, try again
|
|
self.dom.destroy()
|
|
except libvirt.libvirtError:
|
|
pass
|
|
except AttributeError:
|
|
self.logger.out(
|
|
"Failed to stop VM", state="e", prefix="Domain {}".format(self.domuuid)
|
|
)
|
|
self.removeDomainFromList()
|
|
|
|
if self.inrestart is False:
|
|
self.zkhandler.write([(("domain.state", 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 = self.zkhandler.read(("domain.state", self.domuuid))
|
|
if current_state not in ["shutdown", "restart", "migrate"]:
|
|
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 Exception:
|
|
lvdomstate = None
|
|
|
|
if lvdomstate != libvirt.VIR_DOMAIN_RUNNING:
|
|
self.removeDomainFromList()
|
|
self.zkhandler.write([(("domain.state", 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),
|
|
)
|
|
self.zkhandler.write([(("domain.state", 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)
|
|
self.zkhandler.write([(("domain.state", self.domuuid), "start")])
|
|
|
|
# Migrate the VM to a target host
|
|
def migrate_vm(self, force_live=False, force_shutdown=False):
|
|
# Wait for any previous migration
|
|
while self.inmigrate:
|
|
time.sleep(0.1)
|
|
|
|
if self.migration_method == "live":
|
|
force_live = True
|
|
elif self.migration_method == "shutdown":
|
|
force_shutdown = True
|
|
|
|
self.inmigrate = True
|
|
self.logger.out(
|
|
'Migrating VM to node "{}"'.format(self.node),
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
|
|
# Used for sanity checking later
|
|
target_node = self.zkhandler.read(("domain.node", self.domuuid))
|
|
|
|
aborted = False
|
|
|
|
def abort_migrate(reason):
|
|
self.zkhandler.write(
|
|
[
|
|
(("domain.state", self.domuuid), "start"),
|
|
(("domain.node", self.domuuid), self.this_node.name),
|
|
(("domain.last_node", self.domuuid), self.last_lastnode),
|
|
]
|
|
)
|
|
migrate_lock_node.release()
|
|
migrate_lock_state.release()
|
|
self.inmigrate = False
|
|
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 = self.zkhandler.exclusivelock(("domain.node", self.domuuid))
|
|
migrate_lock_state = self.zkhandler.exclusivelock(
|
|
("domain.state", self.domuuid)
|
|
)
|
|
migrate_lock_node.acquire()
|
|
migrate_lock_state.acquire()
|
|
|
|
# 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
|
|
|
|
time.sleep(0.5) # Initial delay for the first writer to grab 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),
|
|
)
|
|
self.shutdown_vm()
|
|
return True
|
|
|
|
self.logger.out(
|
|
"Acquiring lock for migration phase B",
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
lock = self.zkhandler.exclusivelock(("domain.migrate.sync_lock", self.domuuid))
|
|
try:
|
|
lock.acquire(timeout=30.0)
|
|
except Exception:
|
|
abort_migrate("Timed out waiting for peer")
|
|
return
|
|
self.logger.out(
|
|
"Acquired lock for migration phase B",
|
|
state="o",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
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:
|
|
migrate_shutdown()
|
|
if aborted:
|
|
abort_migrate("Live migration failed and is required")
|
|
return
|
|
self.last_currentnode = self.zkhandler.read(("domain.node", self.domuuid))
|
|
self.last_lastnode = self.zkhandler.read(("domain.last_node", self.domuuid))
|
|
migrate_lock_node.release()
|
|
migrate_lock_state.release()
|
|
lock.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.last_currentnode),
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
|
|
# Ensure our lock key is populated
|
|
self.zkhandler.write(
|
|
[(("domain.migrate.sync_lock", self.domuuid), self.domuuid)]
|
|
)
|
|
|
|
self.logger.out(
|
|
"Acquiring lock for migration phase A",
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
lock = self.zkhandler.exclusivelock(("domain.migrate.sync_lock", self.domuuid))
|
|
try:
|
|
lock.acquire(timeout=30.0)
|
|
except Exception:
|
|
self.logger.out("Failed to acquire exclusive lock for VM", state="w")
|
|
return
|
|
self.logger.out(
|
|
"Acquired lock for migration phase A",
|
|
state="o",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
# Exactly twice the amount of time that the other side is waiting
|
|
time.sleep(1)
|
|
lock.release()
|
|
|
|
self.logger.out(
|
|
"Acquiring lock for phase C",
|
|
state="i",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
lock.acquire()
|
|
self.logger.out(
|
|
"Acquired lock for migration phase C",
|
|
state="o",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
# Set the updated data
|
|
self.last_currentnode = self.zkhandler.read(("domain.node", self.domuuid))
|
|
self.last_lastnode = self.zkhandler.read(("domain.last_node", self.domuuid))
|
|
self.state = self.zkhandler.read(("domain.state", 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()
|
|
self.zkhandler.write([(("domain.state", self.domuuid), "start")])
|
|
self.logger.out(
|
|
"Successfully received migrated VM",
|
|
state="o",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
else:
|
|
# The receive somehow failed
|
|
self.zkhandler.write(
|
|
[
|
|
(("domain.state", self.domuuid), "fail"),
|
|
(
|
|
("domain.failed_reason", self.domuuid),
|
|
"Failed to receive migration",
|
|
),
|
|
]
|
|
)
|
|
self.logger.out(
|
|
"Failed to receive migrated VM",
|
|
state="e",
|
|
prefix="Domain {}".format(self.domuuid),
|
|
)
|
|
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
|
|
self.zkhandler.write([(("domain.state", 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),
|
|
)
|
|
lock.release()
|
|
|
|
self.zkhandler.write([(("domain.migrate.sync_lock", 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 = self.zkhandler.read(("domain.state", self.domuuid))
|
|
self.node = self.zkhandler.read(("domain.node", self.domuuid))
|
|
self.lastnode = self.zkhandler.read(("domain.last_node", self.domuuid))
|
|
self.migration_method = self.zkhandler.read(
|
|
("domain.meta.migrate_method", 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()
|
|
self.zkhandler.write(
|
|
[(("domain.state", 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":
|
|
self.zkhandler.write(
|
|
[(("domain.state", 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()
|
|
|
|
self.state_thread = None
|
|
return
|
|
|
|
# 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
|