def migrate(src_host, src_vmid, dst_host, dst_vmid, ifaces):
assert getState(dst_host, dst_vmid) == generic.State.CREATED, "Destination VM already exists"
state = getState(src_host, src_vmid)
if state == generic.State.CREATED:
#nothing to do
return
#create a tmp directory on both hosts
src_tmp = "/tmp/%s" % uuid.uuid1()
dst_tmp = "/tmp/%s" % uuid.uuid1()
fileutil.mkdir(src_host, src_tmp)
fileutil.mkdir(dst_host, dst_tmp)
#create destination vm
create(dst_host, dst_vmid)
#transfer vm disk image
fileutil.copy(src_host, _imagePath(src_vmid), "%s/disk.qcow2" % src_tmp)
fileutil.fileTransfer(src_host, "%s/disk.qcow2" % src_tmp, dst_host, "%s/disk.qcow2" % dst_tmp, direct=True)
if state == generic.State.STARTED:
#prepare rdiff before snapshot to save time
src_host.execute("rdiff signature %(tmp)s/disk.qcow2 %(tmp)s/rdiff.sigs" % {"tmp": src_tmp})
#create a memory snapshot on old host
_monitor(src_host, src_vmid, "stop")
_monitor(src_host, src_vmid, "savevm migrate", timeout=900)
#stop vm
stop(src_host, src_vmid)
#create and transfer a disk image rdiff
src_host.execute("rdiff -- delta %(tmp)s/rdiff.sigs %(disk)s - | gzip > %(tmp)s/disk.rdiff.gz" % {"tmp": src_tmp, "disk": _imagePath(src_vmid)})
fileutil.fileTransfer(src_host, "%s/disk.rdiff.gz" % src_tmp, dst_host, "%s/disk.rdiff.gz" % dst_tmp)
#patch disk image with the rdiff
dst_host.execute("gunzip < %(tmp)s/disk.rdiff.gz | rdiff -- patch %(tmp)s/disk.qcow2 - %(tmp)s/disk-patched.qcow2" % {"tmp": dst_tmp})
fileutil.move(dst_host,"%s/disk-patched.qcow2" % dst_tmp, "%s/disk.qcow2" % dst_tmp)
#use disk image on new host
useImage(dst_host, dst_vmid, "%s/disk.qcow2" % dst_tmp)
for iface in ifaces:
addInterface(dst_host, dst_vmid, iface)
if state == generic.State.STARTED:
start(dst_host, dst_vmid)
#restore snapshot
_monitor(dst_host, dst_vmid, "stop")
_monitor(dst_host, dst_vmid, "loadvm migrate", timeout=900)
_monitor(dst_host, dst_vmid, "cont")
_monitor(dst_host, dst_vmid, "delvm migrate", timeout=900)
#destroy vm on old host
destroy(src_host, src_vmid)
#remove tmp directories
fileutil.delete(src_host, src_tmp, recursive=True)
fileutil.delete(dst_host, dst_tmp, recursive=True)
def migrate(src_host, src_vmid, dst_host, dst_vmid, template, ifaces):
assert getState(dst_host, dst_vmid) == generic.State.CREATED, "Destination VM already exists"
state = getState(src_host, src_vmid)
if state == generic.State.CREATED:
#nothing to do
return
#create a tmp directory on both hosts
src_tmp = "/tmp/%s" % uuid.uuid1()
dst_tmp = "/tmp/%s" % uuid.uuid1()
fileutil.mkdir(src_host, src_tmp)
fileutil.mkdir(dst_host, dst_tmp)
#create destination vm
create(dst_host, dst_vmid, template)
try:
#transfer vm disk image
copyImage(src_host, src_vmid, "%s/disk.tar" % src_tmp)
fileutil.fileTransfer(src_host, "%s/disk.tar" % src_tmp, dst_host, "%s/disk.tar" % dst_tmp, compressed=True)
if state == generic.State.STARTED:
#prepare rdiff before snapshot to save time
src_host.execute("rdiff signature %(tmp)s/disk.tar %(tmp)s/rdiff.sigs" % {"tmp": src_tmp})
#create a memory snapshot on old host
res = _vzctl(src_host, src_vmid, "chkpnt", ["--dumpfile", "%s/openvz.dump" % src_tmp])
assert fileutil.existsFile(src_host, "%s/openvz.dump" % src_tmp), "Failed to create snapshot: %s" % res
try:
fileutil.fileTransfer(src_host, "%s/openvz.dump" % src_tmp, dst_host, "%s/openvz.dump" % dst_tmp, compressed=True)
#create and transfer a disk image rdiff
copyImage(src_host, src_vmid, "%s/disk2.tar" % src_tmp)
src_host.execute("rdiff -- delta %(tmp)s/rdiff.sigs %(disk)s - | gzip > %(tmp)s/disk.rdiff.gz" % {"tmp": src_tmp, "disk": "%s/disk2.tar" % src_tmp})
fileutil.fileTransfer(src_host, "%s/disk.rdiff.gz" % src_tmp, dst_host, "%s/disk.rdiff.gz" % dst_tmp, direct=True)
#patch disk image with the rdiff
dst_host.execute("gunzip < %(tmp)s/disk.rdiff.gz | rdiff -- patch %(tmp)s/disk.tar - %(tmp)s/disk-patched.tar" % {"tmp": dst_tmp})
fileutil.move(dst_host,"%s/disk-patched.tar" % dst_tmp, "%s/disk.tar" % dst_tmp)
except:
_vzctl(src_host, src_vmid, "restore", ["--dumpfile", "%s/openvz.dump" % src_tmp])
raise
#use disk image on new host
useImage(dst_host, dst_vmid, "%s/disk.tar" % dst_tmp)
for iface in ifaces:
addInterface(dst_host, dst_vmid, iface)
if state == generic.State.STARTED:
try:
#restore snapshot
_vzctl(dst_host, dst_vmid, "restore", ["--dumpfile", "%s/openvz.dump" % dst_tmp])
assert getState(dst_host, dst_vmid) == generic.State.STARTED
except:
_vzctl(src_host, src_vmid, "restore", ["--dumpfile", "%s/openvz.dump" % src_tmp])
raise
except:
destroy(dst_host, dst_vmid)
fileutil.delete(src_host, src_tmp, recursive=True)
fileutil.delete(dst_host, dst_tmp, recursive=True)
raise
#destroy vm on old host
destroy(src_host, src_vmid)
#remove tmp directories
fileutil.delete(src_host, src_tmp, recursive=True)
fileutil.delete(dst_host, dst_tmp, recursive=True)
