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