152 lines
5.9 KiB
Python
Executable file
152 lines
5.9 KiB
Python
Executable file
import argparse
|
|
import multiprocessing as mp
|
|
import time
|
|
|
|
from etcd3_wrapper import Etcd3Wrapper
|
|
|
|
from ucloud.common.request import RequestEntry, RequestType
|
|
from ucloud.config import (vm_pool, request_pool,
|
|
etcd_client, running_vms,
|
|
etcd_wrapper_args, etcd_wrapper_kwargs,
|
|
HostPool, config)
|
|
|
|
from .helper import find_free_port
|
|
from . import virtualmachine
|
|
from ucloud.host import logger
|
|
|
|
|
|
def update_heartbeat(hostname):
|
|
"""Update Last HeartBeat Time for :param hostname: in etcd"""
|
|
client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)
|
|
host_pool = HostPool(client, config['etcd']['HOST_PREFIX'])
|
|
this_host = next(filter(lambda h: h.hostname == hostname, host_pool.hosts), None)
|
|
|
|
while True:
|
|
this_host.update_heartbeat()
|
|
host_pool.put(this_host)
|
|
time.sleep(10)
|
|
|
|
|
|
def maintenance(host):
|
|
# To capture vm running according to running_vms list
|
|
|
|
# This is to capture successful migration of a VM.
|
|
# Suppose, this host is running "vm1" and user initiated
|
|
# request to migrate this "vm1" to some other host. On,
|
|
# successful migration the destination host would set
|
|
# the vm hostname to itself. Thus, we are checking
|
|
# whether this host vm is successfully migrated. If yes
|
|
# then we shutdown "vm1" on this host.
|
|
|
|
to_be_removed = []
|
|
for running_vm in running_vms:
|
|
with vm_pool.get_put(running_vm.key) as vm_entry:
|
|
if vm_entry.hostname != host.key and not vm_entry.in_migration:
|
|
running_vm.handle.shutdown()
|
|
logger.info("VM migration not completed successfully.")
|
|
to_be_removed.append(running_vm)
|
|
|
|
for r in to_be_removed:
|
|
running_vms.remove(r)
|
|
|
|
# To check vm running according to etcd entries
|
|
alleged_running_vms = vm_pool.by_status("RUNNING", vm_pool.by_host(host.key))
|
|
|
|
for vm_entry in alleged_running_vms:
|
|
_vm = virtualmachine.get_vm(running_vms, vm_entry.key)
|
|
# Whether, the allegedly running vm is in our
|
|
# running_vms list or not if it is said to be
|
|
# running on this host but it is not then we
|
|
# need to shut it down
|
|
|
|
# This is to capture poweroff/shutdown of a VM
|
|
# initiated by user inside VM. OR crash of VM by some
|
|
# user running process
|
|
if (_vm and not _vm.handle.is_running()) or not _vm:
|
|
logger.debug("_vm = %s, is_running() = %s" % (_vm, _vm.handle.is_running()))
|
|
vm_entry.add_log("""{} is not running but is said to be running.
|
|
So, shutting it down and declare it killed""".format(vm_entry.key))
|
|
vm_entry.declare_killed()
|
|
vm_pool.put(vm_entry)
|
|
if _vm:
|
|
running_vms.remove(_vm)
|
|
|
|
def check():
|
|
if config['etcd']['STORAGE_BACKEND'] == 'filesystem' and not isdir(config['etcd']['VM_DIR']):
|
|
print("You have set STORAGE_BACKEND to filesystem. So, the vm directory mentioned"
|
|
" in .env file must exists. But, it don't.")
|
|
sys.exit(1)
|
|
|
|
|
|
|
|
def main(hostname):
|
|
check()
|
|
|
|
heartbeat_updating_process = mp.Process(target=update_heartbeat, args=(hostname,))
|
|
|
|
host_pool = HostPool(etcd_client, config['etcd']['HOST_PREFIX'])
|
|
host = next(filter(lambda h: h.hostname == hostname, host_pool.hosts), None)
|
|
assert host is not None, "No such host with name = {}".format(hostname)
|
|
|
|
try:
|
|
heartbeat_updating_process.start()
|
|
except Exception as e:
|
|
logger.info("No Need To Go Further. Our heartbeat updating mechanism is not working")
|
|
logger.exception(e)
|
|
exit(-1)
|
|
|
|
logger.info("%s Session Started %s", '*' * 5, '*' * 5)
|
|
|
|
# It is seen that under heavy load, timeout event doesn't come
|
|
# in a predictive manner (which is intentional because we give
|
|
# higher priority to customer's requests) which delays heart
|
|
# beat update which in turn misunderstood by scheduler that the
|
|
# host is dead when it is actually alive. So, to ensure that we
|
|
# update the heart beat in a predictive manner we start Heart
|
|
# beat updating mechanism in separated thread
|
|
|
|
for events_iterator in [
|
|
etcd_client.get_prefix(config['etcd']['REQUEST_PREFIX'], value_in_json=True),
|
|
etcd_client.watch_prefix(config['etcd']['REQUEST_PREFIX'], timeout=10, value_in_json=True),
|
|
]:
|
|
for request_event in events_iterator:
|
|
request_event = RequestEntry(request_event)
|
|
|
|
if request_event.type == "TIMEOUT":
|
|
maintenance(host)
|
|
continue
|
|
|
|
# If the event is directed toward me OR I am destination of a InitVMMigration
|
|
if request_event.hostname == host.key or request_event.destination == host.key:
|
|
logger.debug("VM Request: %s", request_event)
|
|
|
|
request_pool.client.client.delete(request_event.key)
|
|
vm_entry = vm_pool.get(request_event.uuid)
|
|
|
|
if vm_entry:
|
|
if request_event.type == RequestType.StartVM:
|
|
virtualmachine.start(vm_entry)
|
|
|
|
elif request_event.type == RequestType.StopVM:
|
|
virtualmachine.stop(vm_entry)
|
|
|
|
elif request_event.type == RequestType.DeleteVM:
|
|
virtualmachine.delete(vm_entry)
|
|
|
|
elif request_event.type == RequestType.InitVMMigration:
|
|
virtualmachine.start(vm_entry, host.key, find_free_port())
|
|
|
|
elif request_event.type == RequestType.TransferVM:
|
|
virtualmachine.transfer(request_event)
|
|
else:
|
|
logger.info("VM Entry missing")
|
|
|
|
logger.info("Running VMs %s", running_vms)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
argparser = argparse.ArgumentParser()
|
|
argparser.add_argument("hostname", help="Name of this host. e.g /v1/host/1")
|
|
args = argparser.parse_args()
|
|
mp.set_start_method('spawn')
|
|
main(args.hostname)
|