305 lines
No EOL
9.5 KiB
Python
Executable file
305 lines
No EOL
9.5 KiB
Python
Executable file
# QEMU Manual
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# https://qemu.weilnetz.de/doc/qemu-doc.html
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# For QEMU Monitor Protocol Commands Information, See
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# https://qemu.weilnetz.de/doc/qemu-doc.html#pcsys_005fmonitor
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import errno
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import os
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import subprocess
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import tempfile
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import time
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from functools import wraps
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from os.path import join
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from typing import Union
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import bitmath
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import sshtunnel
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from decouple import config
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import qmp
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from config import (WITHOUT_CEPH, etcd_client, logging, request_pool,
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running_vms, vm_pool)
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from ucloud_common.helpers import get_ipv4_address
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from ucloud_common.request import RequestEntry, RequestType
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from ucloud_common.vm import VMEntry, VMStatus
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class VM:
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def __init__(self, key, handle, vnc_socket_file):
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self.key = key # type: str
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self.handle = handle # type: qmp.QEMUMachine
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self.vnc_socket_file = vnc_socket_file # type: tempfile.NamedTemporaryFile
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def __repr__(self):
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return "VM({})".format(self.key)
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def get_start_command_args(
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vm_entry, vnc_sock_filename: str, migration=False, migration_port=4444
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):
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threads_per_core = 1
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vm_memory = int(bitmath.Byte(int(vm_entry.specs["ram"])).to_MB())
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vm_cpus = int(vm_entry.specs["cpu"])
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vm_uuid = vm_entry.uuid
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if WITHOUT_CEPH:
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command = "-drive file={},format=raw,if=virtio,cache=none".format(
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os.path.join("/var/vm", vm_uuid)
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)
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else:
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command = "-drive file=rbd:uservms/{},format=raw,if=virtio,cache=none".format(
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vm_uuid
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)
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command += " -device virtio-rng-pci -vnc unix:{}".format(vnc_sock_filename)
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command += " -m {} -smp cores={},threads={}".format(
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vm_memory, vm_cpus, threads_per_core
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)
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command += " -name {}".format(vm_uuid)
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if migration:
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command += " -incoming tcp:0:{}".format(migration_port)
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return command.split(" ")
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def create_vm_object(vm_entry, migration=False, migration_port=4444):
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# NOTE: If migration suddenly stop working, having different
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# VNC unix filename on source and destination host can
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# be a possible cause of it.
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# REQUIREMENT: Use Unix Socket instead of TCP Port for VNC
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vnc_sock_file = tempfile.NamedTemporaryFile()
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qemu_args = get_start_command_args(
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vm_entry=vm_entry,
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vnc_sock_filename=vnc_sock_file.name,
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migration=migration,
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migration_port=migration_port,
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)
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qemu_machine = qmp.QEMUMachine("/usr/bin/qemu-system-x86_64", args=qemu_args)
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return VM(vm_entry.key, qemu_machine, vnc_sock_file)
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def get_vm(vm_list: list, vm_key) -> Union[VM, None]:
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return next((vm for vm in vm_list if vm.key == vm_key), None)
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def need_running_vm(func):
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@wraps(func)
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def wrapper(e):
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vm = get_vm(running_vms, e.key)
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if vm:
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try:
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status = vm.handle.command("query-status")
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logging.debug("VM Status Check - %s", status)
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except Exception as exception:
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logging.info("%s failed - VM %s %s", func.__name__, e, exception)
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else:
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return func(e)
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else:
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logging.info("%s failed because VM %s is not running", func.__name__, e.key)
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return
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return wrapper
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def create(vm_entry: VMEntry):
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vm_hdd = int(bitmath.Byte(int(vm_entry.specs["hdd"])).to_MB())
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if WITHOUT_CEPH:
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_command_to_create = [
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"cp",
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os.path.join("/var/image", vm_entry.image_uuid),
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os.path.join("/var/vm", vm_entry.uuid),
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]
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_command_to_extend = [
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"qemu-img",
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"resize",
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os.path.join("/var/vm", vm_entry.uuid),
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"{}M".format(vm_hdd),
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]
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else:
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_command_to_create = [
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"rbd",
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"clone",
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"images/{}@protected".format(vm_entry.image_uuid),
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"uservms/{}".format(vm_entry.uuid),
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]
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_command_to_extend = [
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"rbd",
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"resize",
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"uservms/{}".format(vm_entry.uuid),
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"--size",
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vm_hdd,
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]
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try:
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subprocess.check_output(_command_to_create)
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except subprocess.CalledProcessError as e:
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if e.returncode == errno.EEXIST:
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logging.debug("Image for vm %s exists", vm_entry.uuid)
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# File Already exists. No Problem Continue
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return
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# This exception catches all other exceptions
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# i.e FileNotFound (BaseImage), pool Does Not Exists etc.
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logging.exception(e)
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vm_entry.status = "ERROR"
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else:
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try:
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subprocess.check_output(_command_to_extend)
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except Exception as e:
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logging.exception(e)
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else:
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logging.info("New VM Created")
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def start(vm_entry: VMEntry):
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_vm = get_vm(running_vms, vm_entry.key)
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# VM already running. No need to proceed further.
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if _vm:
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logging.info("VM %s already running", vm_entry.uuid)
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return
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else:
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create(vm_entry)
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launch_vm(vm_entry)
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@need_running_vm
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def stop(vm_entry):
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vm = get_vm(running_vms, vm_entry.key)
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vm.handle.shutdown()
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if not vm.handle.is_running():
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vm_entry.add_log("Shutdown successfully")
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vm_entry.declare_stopped()
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vm_pool.put(vm_entry)
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running_vms.remove(vm)
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def delete(vm_entry):
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logging.info("Deleting VM | %s", vm_entry)
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stop(vm_entry)
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path_without_protocol = vm_entry.path[vm_entry.path.find(":") + 1 :]
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if WITHOUT_CEPH:
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vm_deletion_command = ["rm", os.path.join("/var/vm", vm_entry.uuid)]
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else:
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vm_deletion_command = ["rbd", "rm", path_without_protocol]
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try:
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subprocess.check_output(vm_deletion_command)
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except Exception as e:
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logging.exception(e)
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else:
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etcd_client.client.delete(vm_entry.key)
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def transfer(request_event):
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# This function would run on source host i.e host on which the vm
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# is running initially. This host would be responsible for transferring
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# vm state to destination host.
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_host, _port = request_event.parameters["host"], request_event.parameters["port"]
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_uuid = request_event.uuid
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_destination = request_event.destination_host_key
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vm = get_vm(running_vms, join("/v1/vm", _uuid))
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if vm:
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tunnel = sshtunnel.SSHTunnelForwarder(
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(_host, 22),
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ssh_username=config("ssh_username"),
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ssh_pkey=config("ssh_pkey"),
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ssh_private_key_password=config("ssh_private_key_password"),
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remote_bind_address=("127.0.0.1", _port),
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)
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try:
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tunnel.start()
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except sshtunnel.BaseSSHTunnelForwarderError:
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logging.exception("Couldn't establish connection to (%s, 22)", _host)
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else:
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vm.handle.command(
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"migrate", uri="tcp:{}:{}".format(_host, tunnel.local_bind_port)
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)
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status = vm.handle.command("query-migrate")["status"]
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while status not in ["failed", "completed"]:
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time.sleep(2)
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status = vm.handle.command("query-migrate")["status"]
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with vm_pool.get_put(request_event.uuid) as source_vm:
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if status == "failed":
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source_vm.add_log("Migration Failed")
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elif status == "completed":
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# If VM is successfully migrated then shutdown the VM
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# on this host and update hostname to destination host key
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source_vm.add_log("Successfully migrated")
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source_vm.hostname = _destination
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running_vms.remove(vm)
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vm.handle.shutdown()
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source_vm.in_migration = False # VM transfer finished
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finally:
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tunnel.close()
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def init_migration(vm_entry, destination_host_key):
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# This function would run on destination host i.e host on which the vm
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# would be transferred after migration.
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# This host would be responsible for starting VM that would receive
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# state of VM running on source host.
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_vm = get_vm(running_vms, vm_entry.key)
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if _vm:
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# VM already running. No need to proceed further.
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logging.info("%s Already running", _vm.key)
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return
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launch_vm(vm_entry, migration=True, migration_port=4444,
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destination_host_key=destination_host_key)
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def launch_vm(vm_entry, migration=False, migration_port=None, destination_host_key=None):
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logging.info("Starting %s", vm_entry.key)
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vm = create_vm_object(vm_entry, migration=migration, migration_port=migration_port)
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try:
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vm.handle.launch()
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except Exception as e:
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logging.exception(e)
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if migration:
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# We don't care whether MachineError or any other error occurred
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vm.handle.shutdown()
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else:
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# Error during typical launch of a vm
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vm_entry.add_log("Error Occurred while starting VM")
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vm_entry.declare_killed()
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vm_pool.put(vm_entry)
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else:
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vm_entry.vnc_socket = vm.vnc_socket_file.name
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running_vms.append(vm)
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if migration:
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vm_entry.in_migration = True
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r = RequestEntry.from_scratch(
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type=RequestType.TransferVM,
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hostname=vm_entry.hostname,
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parameters={"host": get_ipv4_address(), "port": 4444},
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uuid=vm_entry.uuid,
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destination_host_key=destination_host_key,
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)
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request_pool.put(r)
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else:
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# Typical launching of a vm
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vm_entry.status = VMStatus.running
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vm_entry.add_log("Started successfully")
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vm_pool.put(vm_entry)
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