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Allow enforcement of live migration

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Provides a CLI and API argument to force live migration, which triggers
a new VM state "migrate-live". The node daemon VMInstance during migrate
will read this flag from the state and, if enforced, will not trigger a
shutdown migration.

Closes #95
This commit is contained in:
Joshua Boniface
2020-06-06 11:49:21 -04:00
parent b5434ba744
commit ce60836c34
6 changed files with 72 additions and 32 deletions
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26
node-daemon/pvcnoded/VMInstance.py
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@ -371,7 +371,7 @@ class VMInstance(object):
return True
# Migrate the VM to a target host
def migrate_vm(self):
def migrate_vm(self, force_live=False):
# Don't try to migrate a node to itself, set back to start
if self.node == self.lastnode:
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'start' })
@ -383,8 +383,16 @@ class VMInstance(object):
migrate_ret = self.live_migrate_vm()
if not migrate_ret:
self.logger.out('Could not live migrate VM; shutting down to migrate instead', state='e', prefix='Domain {}:'.format(self.domuuid))
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'shutdown' })
if force_live:
self.logger.out('Could not live migrate VM; live migration enforced, aborting', state='e', prefix='Domain {}:'.format(self.domuuid))
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): ''
})
else:
self.logger.out('Could not live migrate VM; shutting down to migrate instead', state='e', prefix='Domain {}:'.format(self.domuuid))
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(self.domuuid): 'shutdown' })
else:
self.removeDomainFromList()
# Stop the log watcher
@ -418,7 +426,7 @@ class VMInstance(object):
break
else:
# If the state is no longer migrate
if self.state != 'migrate':
if self.state not in ['migrate', 'migrate-live']:
# The receive was aborted before it timed out or was completed
self.logger.out('Receive aborted via state change', state='w', prefix='Domain {}:'.format(self.domuuid))
break
@ -498,6 +506,7 @@ class VMInstance(object):
# Valid states are:
# start
# migrate
# migrate-live
# restart
# shutdown
# stop
@ -523,7 +532,7 @@ class VMInstance(object):
# Add domain to running list
self.addDomainToList()
# VM is already running and should be but stuck in migrate state
elif self.state == "migrate":
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' })
@ -544,7 +553,7 @@ class VMInstance(object):
# Start the domain
self.start_vm()
# VM should be migrated to this node
elif self.state == "migrate":
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)
@ -566,7 +575,10 @@ class VMInstance(object):
if running == libvirt.VIR_DOMAIN_RUNNING:
# VM should be migrated away from this node
if self.state == "migrate":
self.migrate_vm()
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()