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from StringIO import StringIO
from xml.etree import cElementTree as et
from cloudcontrol.node.host import Handler as HostHandler
from cloudcontrol.node.tags import Tag, tag_inspector, get_tags
from cloudcontrol.node.hypervisor import tags
from cloudcontrol.node.hypervisor.kvm import KVM
UndefinedDomain, DRBDError, VMMigrationError,
from cloudcontrol.node.hypervisor.jobs import (
ImportVolume, ExportVolume, TCPTunnel, DRBD,
)
from cloudcontrol.node.utils import close_fds, set_signal_map
logger = logging.getLogger(__name__)
# FIXME find a way to refactor Handler and Hypervisor class
class Handler(HostHandler):
def __init__(self, *args, **kwargs):
"""
self.hypervisor_name = kwargs.pop('hypervisor_name')
HostHandler.__init__(self, *args, **kwargs)
#: keep index of asynchronous calls
self.async_calls = dict()
self.timer = self.main.evloop.timer(.0, 5., self.virt_connect_cb)
self.hypervisor = None
self._virt_connected = False
# register tags
self.tag_db.add_tags(tag_inspector(tags, self))
@property
def virt_connected(self):
return self._virt_connected
@virt_connected.setter
def virt_connected(self, value):
self._virt_connected = value
# update tags
for tag in ('vir_status', 'sto', 'nvm', 'vmpaused', 'vmstarted',
'vmstopped', 'hvver', 'libvirtver', 'hv'):
self.tag_db['__main__'][tag].update_value()
def start(self):
self.timer.start()
HostHandler.start(self)
def stop(self):
self.timer.stop()
if self.hypervisor is not None:
self.hypervisor.stop()
HostHandler.stop(self)
def virt_connect_cb(self, *args):
# initialize hypervisor instance
self.hypervisor = KVM(
name=self.hypervisor_name,
handler=self,
)
except libvirt.libvirtError:
logger.exception('Error while connecting to libvirt')
return
self.virt_connected = True
# register hypervisor storage tags
for name, storage in self.hypervisor.storage.storages.iteritems():
self.tag_db.add_tags((
Tag('sto%s_state' % name, lambda: storage.state, 5, 5),
Tag('sto%s_size' % name, lambda: storage.capacity, 5, 5),
Tag('sto%s_free' % name, lambda: storage.available, 5, 5),
lambda: storage.capacity - storage.available, 5, 5),
Tag('sto%s_type' % name, lambda: storage.type, 5, 5),
self.tag_db.add_sub_object(dom.name, dom.tags.itervalues())
# we must refresh those tags only when domains tags are registered to
# have the calculated values
for tag in ('cpualloc', 'cpurunning', 'memalloc', 'memrunning'):
self.tag_db['__main__'][tag].update_value()
self.rpc_handler.update(dict(
vm_define=self.vm_define,
vm_undefine=self.vm_undefine,
vm_export=self.vm_export,
vm_stop=self.vm_stop,
vm_start=self.vm_start,
vm_suspend=self.vm_suspend,
vm_resume=self.vm_resume,
))
self.main.reset_handler('vm_define', self.vm_define)
self.main.reset_handler('vm_undefine', self.vm_undefine)
self.main.reset_handler('vm_export', self.vm_export)
self.main.reset_handler('vm_stop', self.vm_stop)
self.main.reset_handler('vm_destroy', self.vm_destroy)
self.main.reset_handler('vm_start', self.vm_start)
self.main.reset_handler('vm_suspend', self.vm_suspend)
self.main.reset_handler('vm_resume', self.vm_resume)
self.main.reset_handler('vm_migrate_tunneled', self.vm_migrate_tunneled)
self.main.reset_handler('vol_create', self.vol_create)
self.main.reset_handler('vol_delete', self.vol_delete)
self.main.reset_handler('vol_import', self.vol_import)
self.main.reset_handler('vol_import_wait', self.vol_import_wait)
self.main.reset_handler('vol_export', self.vol_export)
self.main.reset_handler('tun_setup', self.tun_setup)
self.main.reset_handler('tun_connect', self.tun_connect)
self.main.reset_handler('tun_connect_hv', self.tun_connect_hv)
self.main.reset_handler('tun_destroy', self.tun_destroy)
self.main.reset_handler('drbd_setup', self.drbd_setup)
self.main.reset_handler('drbd_connect', self.drbd_connect)
self.main.reset_handler('drbd_role', self.drbd_role)
self.main.reset_handler('drbd_takeover', self.drbd_takeover)
self.main.reset_handler('drbd_sync_status', self.drbd_sync_status)
self.main.reset_handler('drbd_shutdown', self.drbd_shutdown)
self.main.reset_handler('vm_open_console', self.vm_open_console)
self.main.reset_handler('vm_disable_virtio_cache',
self.vm_disable_virtio_cache)
self.main.reset_handler('vm_set_autostart', self.vm_set_autostart)
# if everything went fine, unregister the timer
self.timer.stop()
def virt_connect_restart(self):
"""Restart libvirt connection.
This method might be called when libvirt connection is lost.
"""
if not self.virt_connected:
return
logger.error('Connection to libvirt lost, trying to restart')
# update connection state
self.virt_connected = False
# refresh those tags
for tag in ('cpualloc', 'cpurunning', 'memalloc', 'memrunning'):
self.tag_db['__main__'][tag].update_value()
# unregister tags that will be re registered later
for storage in self.hypervisor.storage.storages:
self.tag_db.remove_tags((
'sto%s_state' % storage,
'sto%s_size' % storage,
'sto%s_free' % storage,
'sto%s_used' % storage,
# unregister sub objects (for the same reason)
for sub_id in self.tag_db.keys():
if sub_id == '__main__':
continue
self.tag_db.remove_sub_object(sub_id)
# stop and delete hypervisor instance
self.hypervisor.stop()
self.hypervisor = None
# remove handlers related to libvirt
self.main.remove_handler('vm_define')
self.main.remove_handler('vm_undefine')
self.main.remove_handler('vm_export')
self.main.remove_handler('vm_stop')
self.main.remove_handler('vm_start')
self.main.remove_handler('vm_suspend')
self.main.remove_handler('vm_resume')
self.main.remove_handler('vm_migrate_tunneled')
self.main.remove_handler('vol_create')
self.main.remove_handler('vol_delete')
self.main.remove_handler('vol_import')
self.main.remove_handler('vol_import_wait')
self.main.remove_handler('vol_export')
self.main.remove_handler('tun_setup')
self.main.remove_handler('tun_connect')
self.main.remove_handler('tun_connect_hv')
self.main.remove_handler('tun_destroy')
self.main.remove_handler('drbd_setup')
self.main.remove_handler('drbd_connect')
self.main.remove_handler('drbd_role')
self.main.remove_handler('drbd_takeover')
self.main.remove_handler('drbd_sync_status')
self.main.remove_handler('drbd_shutdown')
self.main.remove_handler('vm_disable_virtio_cache')
self.main.remove_handler('vm_set_autostart')
# launch connection timer
self.timer.start()
def iter_vms(self, vm_names):
"""Utility function to iterate over VM objects using their names."""
if vm_names is None:
return
get_domain = self.hypervisor.domains.get
for name in vm_names:
dom = get_domain(name)
if dom is not None:
yield dom
def vm_define(self, data, format='xml'):
logger.debug('VM define')
if format != 'xml':
raise NotImplementedError('Format not supported')
return self.hypervisor.vm_define(data)
def vm_undefine(self, name):
vm = self.hypervisor.domains.get(name)
if vm is not None:
vm.undefine()
def vm_export(self, name, format='xml'):
if format != 'xml':
raise NotImplementedError('Format not supported')
vm = self.hypervisor.domains.get(name)
if vm is None:
return
return vm.lv_dom.XMLDesc(0)
def vm_stop(self, name):
logger.debug('VM stop %s', name)
try:
self.hypervisor.domains[name].stop()
except libvirt.libvirtError:
logger.exception('Error while stopping VM %s', name)
raise
except KeyError:
msg = 'Cannot stop VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_destroy(self, name):
logger.debug('VM destroy %s', name)
try:
self.hypervisor.domains[name].destroy()
except libvirt.libvirtError as exc:
# Libvirt raises exception 'domain is not running' even if domain
# is running, might be a bug in libvirt
if 'domain is not running' not in str(exc) or (
self.hypervisor.domains[name].state != 'running'):
logger.exception('Error while destroying VM %s', name)
raise
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except KeyError:
msg = 'Cannot destroy VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_start(self, name):
logger.debug('VM start %s', name)
try:
self.hypervisor.domains[name].start()
except libvirt.libvirtError:
logger.exception('Error while starting VM %s', name)
raise
except KeyError:
msg = 'Cannot start VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_suspend(self, name):
logger.debug('VM suspend %s', name)
try:
self.hypervisor.domains[name].suspend()
except libvirt.libvirtError:
logger.exception('Error while suspending VM %s', name)
raise
except KeyError:
msg = 'Cannot suspend VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_resume(self, name):
logger.debug('VM resume %s', name)
try:
self.hypervisor.domains[name].resume()
except libvirt.libvirtError:
logger.exception('Error while resuming VM %s', name)
raise
except KeyError:
msg = 'Cannot resume VM %s because it is not defined' % name
logger.error(msg)
raise UndefinedDomain(msg)
def vm_migrate_tunneled(self, name, tun_res, migtun_res, unsafe=False,
timeout=60.):
"""Live migrate VM through TCP tunnel.
:param name: VM name to migrate
:param tun_res: result of tunnel_setup handler
:param migtun_res: result of tunnel setup handler
:param unsafe: for Libvirt >= 0.9.11, see
http://libvirt.org/html/libvirt-libvirt.html#virDomainMigrateFlags
:param float timeout: timeout for libvirt migration (prevents libvirt
from trying to acquire domain lock forever)
"""
logger.debug('VM live migrate %s', name)
try:
# this is the port used by our libvirt in the cc-node (client
# libvirt) to connect to the remote libvirtd
remote_virt_port = tun_res['port']
except KeyError:
logger.error('Invalid formatted argument tun_res for live'
' migration')
raise
try:
# this is the port used by local libvirtd to connect to the remote
# libvirtd (see http://libvirt.org/migration.html)
remote_virt_port2 = migtun_res['port']
except KeyError:
logger.error('Invalid formatted argument migtun_res for live'
' migration')
raise
try:
vm = self.hypervisor.domains[name]
except KeyError:
logger.exception('Cannot find domain %s on hypervisor for live'
' migration', name)
raise
# we open a new connection to libvirt and fork because sometimes libvirt
# python binding, while doing a operation,
# doesn't seem to realease CPython's GIL, therefore all node
# operations are blocked
# the only solution we have found right now is to use a dedicated
# libvirt connection for the migration and fork, the migration operation
# in itself is handled by the child while other threads can be scheduled
try:
pid = os.fork()
except OSError:
logger.error('Cannot fork before running live migration')
raise
if pid == 0:
# child
sys.stderr.write('Hello from child !\n')
sys.stderr.write('Debug is %s\n' % self.main.config.debug)
try:
close_fds(debug=self.main.config.debug)
set_signal_map({
signal.SIGTERM: lambda *args: os._exit(1),
signal.SIGUSR1: signal.SIG_IGN,
signal.SIGINT: signal.SIG_IGN,
# FIXME need more signal ?
})
except:
sys.stderr.write('Error while performing post fork work\n')
traceback.print_exc(file=sys.stderr)
# create a new libvirt connection dedicated to migration
sys.stderr.write('Open new connection to libvirt\n')
try:
new_con = libvirt.open('qemu:///system')
domain = new_con.lookupByUUIDString(vm.uuid)
except libvirt.libvirtError:
sys.stderr.write('Cannot connect to libvirt\n')
os._exit(4)
except:
# error
traceback.print_exc(sys.stderr)
os._exit(2)
sys.stderr.write('Open destination libvirt connection\n')
try:
dest_virt_con = libvirt.open(
'qemu+tcp://127.0.0.1:%d/system' % remote_virt_port)
except libvirt.libvirtError:
sys.stderr.write('Cannot connect to remote libvirt for live'
' migrating vm %s', name)
os._exit(5)
except:
# error
traceback.print_exc(file=sys.stderr)
os._exit(2)
try:
if unsafe:
# VIR_MIGRATE_UNSAFE is not defined for libvirt < 0.9.11
append_flags = getattr(libvirt, 'VIR_MIGRATE_UNSAFE', 0)
else:
append_flags = 0
sys.stderr.write('Do migrate\n')
domain.migrate(
dest_virt_con,
libvirt.VIR_MIGRATE_LIVE | libvirt.VIR_MIGRATE_PEER2PEER |
libvirt.VIR_MIGRATE_TUNNELLED |
libvirt.VIR_MIGRATE_PERSIST_DEST |
libvirt.VIR_MIGRATE_UNDEFINE_SOURCE |
append_flags,
None,
'qemu+tcp://127.0.0.1:%d/system' % remote_virt_port2,
sys.stderr('libvirt error during migration\n')
traceback.print_exc(file=sys.stderr)
os._exit(1)
except:
# whatever the matter is we MUST NOT return to libev or sjRPC
traceback.print_exc(file=sys.stderr)
new_con.close()
dest_virt_con.close()
else:
# watch for migration status every second
started_migration = time.time()
while True:
# wait timeout
time.sleep(1.)
# waitpid with no delay
try:
rpid, status = os.waitpid(pid, os.WNOHANG)
except OSError as exc:
logger.error('Error while waiting for child to terminate: %s',
os.strerror(exc.errno))
raise
# convert status to return status
status >>= 8
logger.debug('Status: %s', status)
if rpid == status == 0:
if time.time() - started_migration < timeout:
continue
# waitpid returned immediately, thus migration still running
# after timeout fired, we need to kill the child (term would
# have no effect)
os.kill(pid, signal.SIGKILL)
try:
rpid, status = os.waitpid(pid, 0)
except OSError as exc:
logger.error('Error while waiting for child after killing'
' it: %s', os.strerror(exc.errno))
raise
assert rpid == pid, 'PID returned by waitpid is not valid'
logger.error('Migration timeout for vm %s', name)
raise VMMigrationError('Timeout')
else:
if status == 4:
raise VMMigrationError('Cannot open new connection to'
' libvirt')
elif status == 5:
raise VMMigrationError('Cannot open connection to'
' remote libvirt')
elif status != 0:
# error
logger.error('Libvirt error while live migrating vm %s',
name)
logger.debug('Exit status %s', status)
raise VMMigrationError('Migration failed')
else:
logger.info('Sucessfuly live migrated vm %s', name)
break
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@threadless
@pass_connection
def vm_open_console(self, conn, name):
"""
:param conn: sjRPC connection instance
:param name: VM name
"""
vm = self.hypervisor.domains[name]
# create connection to the VM console
try:
endpoint = vm.open_console()
except socket.error:
# cannot create socketpair
logger.error('Cannot create connection to VM console')
raise
def on_close(tun):
"""Method of Tunnel protocol close callback."""
tun.endpoint.close()
vm.close_console()
# connect as tunnel endpoint
proto = conn.create_tunnel(endpoint=endpoint, on_close=on_close)
return proto.label
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def vm_disable_virtio_cache(self, name):
"""Set virtio cache to none on VM disks.
:param name: VM name
"""
vm = self.hypervisor.domains[name]
# get VM XML
try:
xml = vm.lv_dom.XMLDesc(0)
except libvirt.libvirtError:
logger.exception('Error while getting domain XML from libvirt, %s',
vm.name)
raise
xml_tree = et.ElementTree()
xml_tree.parse(StringIO(xml))
for disk in xml_tree.findall('devices/disk'):
# check that disk is virtio
target = disk.find('target')
if target is None or target.get('bus') != 'virtio':
continue
# modify cache attr
driver = disk.find('driver')
assert driver is not None
driver.set('cache', 'none')
logger.debug('Set cache attribute for disk %s of VM %s',
target.get('dev'), name)
# write back the XML tree
out = StringIO()
xml_tree.write(out) # check encoding is fine
try:
self.hypervisor.vir_con.defineXML(out.getvalue())
except libvirt.libvirtError:
logger.exception('Cannot update XML file for domain %s', name)
raise
def vm_set_autostart(self, name, autostart=True):
"""Set autostart on VM.
:param name: VM name
:param bool autostart: autostart value to set
"""
vm = self.hypervisor.domains[name]
vm.lv_dom.setAutostart(int(bool(autostart)))
# update autostart value now instead of 10 seconds lag
vm.tags['autostart'].update_value()
def vol_create(self, pool, name, size):
logger.debug('Volume create %s, pool %s, size %s', name, pool, size)
try:
self.hypervisor.storage.create_volume(pool, name, size)
except Exception:
logger.exception('Error while creating volume')
raise
def vol_delete(self, pool, name):
logger.debug('Volume delete %s, pool %s', name, pool)
try:
self.hypervisor.storage.delete_volume(pool, name)
except Exception:
logger.exception('Error while deleting volume')
raise
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def vol_import(self, pool, name):
"""
:param pool: pool name where the volume is
:param name: name of the volume
"""
logger.debug('Volume import pool = %s, volume = %s', pool, name)
try:
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise Exception('Pool storage does not exist') # TODO exc
volume = pool.volumes.get(name)
if volume is None:
raise Exception('Volume does not exist')
# create the job
job = self.main.job_manager.create(ImportVolume, volume)
job.start()
except Exception:
logger.exception('Error while starting import job')
raise
return dict(id=job.id, port=job.port)
def vol_import_wait(self, job_id):
"""Block until completion of the given job id."""
job = self.main.job_manager.get(job_id)
logger.debug('Waiting for import job to terminate')
logger.debug('Import job terminated')
return dict(id=job.id, log='', checksum=job.checksum)
def vol_import_cancel(self, job_id):
"""Cancel import job."""
logger.debug('Cancel import job')
self.main.job_manager.cancel(job_id)
# wait for job to end
job.join() # we don't call wait as it is already called in
# vol_import_wait handler
def vol_export(self, pool, name, raddr, rport):
"""
:param pool: pool name where the volume is
:param name: name of the volume
:param raddr: IP address of the destination to send the volume to
:param rport: TCP port of the destination
"""
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise Exception('Pool storage does not exist')
volume = pool.volumes.get(name)
if volume is None:
raise Exception('Volume does not exist')
try:
job = self.main.job_manager.create(ExportVolume, volume, raddr, rport)
except Exception:
logger.exception('Error while exporting volume')
raise
logger.debug('Export volume successfull')
return dict(id=job.id, log='', checksum=job.checksum)
@threadless
def tun_setup(self, local=True):
"""Set up local tunnel and listen on a random port.
:param local: indicate if we should listen on localhost or all
interfaces
"""
logger.debug('Tunnel setup: local = %s', local)
# create job
job.setup_listen('127.0.0.1' if local else '0.0.0.0')
return dict(
jid=job.id,
key='FIXME',
port=job.port,
)
@threadless
def tun_connect(self, res, remote_res, remote_ip):
"""Connect tunnel to the other end.
:param res: previous result of `tun_setup` handler
:param remote_res: other end result of `tun_setup` handler
:param remote_ip: where to connect
"""
logger.debug('Tunnel connect %s %s', res['jid'], remote_ip)
job = self.main.job_manager.get(res['jid'])
job.setup_connect((remote_ip, remote_res['port']))
@threadless
def tun_connect_hv(self, res, migration=False):
"""Connect tunnel to local libvirt Unix socket.
:param res: previous result of `tun_setup` handler
"""
logger.debug('Tunnel connect hypervisor %s', res['jid'])
job = self.main.job_manager.get(res['jid'])
job.setup_connect('/var/run/libvirt/libvirt-sock')
@threadless
def tun_destroy(self, res):
"""Close given tunnel.
:param res: previous result as givent by `tun_setup` handler
"""
logger.debug('Tunnel destroy %s', res['jid'])
job = self.main.job_manager.get(res['jid'])
job.wait()
def drbd_setup(self, pool, name):
"""Create DRBD volumes.
:param pool: storage pool
:param name: storage volume name
"""
pool = self.hypervisor.storage.get_storage(pool)
if pool is None:
raise DRBDError('Cannot setup DRBD: pool storage does not exist')
elif pool.type != 'logical':
raise DRBDError('Cannot setup DRBD: pool storage is not LVM')
volume = pool.volumes.get(name)
if volume is None:
raise DRBDError('Cannot setup DRBD: volume does not exist')
try:
job = self.main.job_manager.create(DRBD, self.main.evloop,
self.hypervisor.storage,
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pool, volume)
except Exception:
logger.exception('Error while creating DRBD job')
raise
job.setup()
logger.debug('DRBD setup successfull')
return dict(
jid=job.id,
port=job.drbd_port,
)
def drbd_connect(self, res, remote_res, remote_ip):
"""Set up DRBD in connect mode. (Wait for connection and try to connect
to the remote peer.
:param res: previous result of `drbd_setup` handler
:param remote_res: result of remote `drbd_setup` handler
:param remote_ip: IP of remote peer
"""
job = self.main.job_manager.get(res['jid'])
job.connect(remote_ip, remote_res['port'])
job.wait_connection()
def drbd_role(self, res, primary):
"""Set up DRBD role.
:param res: previous result of `drbd_setup` handler
:param bool primary: if True, set up in primary mode else secondary
"""
job = self.main.job_manager.get(res['jid'])
if primary:
job.switch_primary()
else:
job.switch_secondary()
def drbd_takeover(self, res, state):
"""Set up DRBD device as the VM disk. FIXME
:param res: previous result of `drbd_setup` handler
:param state: FIXME
"""
job = self.main.job_manager.get(res['jid'])
job.takeover()
def drbd_sync_status(self, res):
"""Return synchronization status of a current DRBD job.
:param res: previous result of `drbd_setup` handler
"""
status = self.main.job_manager.get(res['jid']).status()
result = dict(
done=status['disk'] == 'UpToDate',
completion=status['percent'],
)
logger.debug('DRBD status %s', result)
return result
def drbd_shutdown(self, res):
"""Destroy DRBD related block devices.
:param res: previous result of `drbd_setup` handler
"""
logger.debug('DRBD shutdown')
job = self.main.job_manager.get(res['jid'])
job.cleanup()
# remove job from job_manager list
self.main.job_manager.notify(job)