387 lines
15 KiB
Python
Executable File
387 lines
15 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 os
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import subprocess as sp
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import tempfile
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import time
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import ipaddress
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from functools import wraps
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from string import Template
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from typing import Union
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from os.path import join as join_path
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import bitmath
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import sshtunnel
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from ucloud.common.helpers import get_ipv6_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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from ucloud.common.network import create_dev, delete_network_interface, find_free_port
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from ucloud.host import logger
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from ucloud.shared import shared
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from ucloud.settings import settings
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from . import qmp
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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 capture_all_exception(func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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try:
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func(*args, **kwargs)
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except Exception:
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logger.exception('Unhandled exception occur in %s. For more details see Syslog.', __name__)
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return wrapper
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class VMM:
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def __init__(self):
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self.etcd_client = shared.etcd_client
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self.storage_handler = shared.storage_handler
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self.running_vms = []
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def get_start_command_args(self, vm_entry, vnc_sock_filename: str, migration=False, migration_port=None):
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threads_per_core = 1
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vm_memory = int(bitmath.parse_string_unsafe(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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vm_networks = vm_entry.network
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command = '-name {}_{}'.format(vm_entry.owner, vm_entry.name)
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command += ' -drive file={},format=raw,if=virtio,cache=none'.format(
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self.storage_handler.qemu_path_string(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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if migration:
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command += ' -incoming tcp:[::]:{}'.format(migration_port)
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for network_mac_and_tap in vm_networks:
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network_name, mac, tap = network_mac_and_tap
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_key = os.path.join(settings['etcd']['network_prefix'], vm_entry.owner, network_name)
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network = self.etcd_client.get(_key, value_in_json=True)
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network_type = network.value["type"]
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network_id = str(network.value["id"])
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network_ipv6 = network.value["ipv6"]
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if network_type == "vxlan":
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tap = create_vxlan_br_tap(_id=network_id,
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_dev=settings['network']['vxlan_phy_dev'],
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tap_id=tap,
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ip=network_ipv6)
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all_networks = self.etcd_client.get_prefix('/v1/network/', value_in_json=True)
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if ipaddress.ip_network(network_ipv6).is_global:
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update_radvd_conf(all_networks)
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command += " -netdev tap,id=vmnet{net_id},ifname={tap},script=no,downscript=no" \
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" -device virtio-net-pci,netdev=vmnet{net_id},mac={mac}" \
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.format(tap=tap, net_id=network_id, mac=mac)
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return command.split(" ")
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def create_vm_object(self, vm_entry, migration=False, migration_port=None):
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vnc_sock_file = tempfile.NamedTemporaryFile()
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qemu_args = self.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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@staticmethod
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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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@capture_all_exception
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def create(self, vm_entry: VMEntry):
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if self.storage_handler.is_vm_image_exists(vm_entry.uuid):
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# File Already exists. No Problem Continue
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logger.debug("Image for vm %s exists", vm_entry.uuid)
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return None
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else:
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vm_hdd = int(bitmath.parse_string_unsafe(vm_entry.specs["os-ssd"]).to_MB())
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if self.storage_handler.make_vm_image(src=vm_entry.image_uuid, dest=vm_entry.uuid):
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if not self.storage_handler.resize_vm_image(path=vm_entry.uuid, size=vm_hdd):
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vm_entry.status = VMStatus.error
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else:
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logger.info("New VM Created")
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@capture_all_exception
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def start(self, vm_entry: VMEntry, destination_host_key=None):
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_vm = self.get_vm(self.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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logger.info("VM %s already running" % vm_entry.uuid)
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return
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else:
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logger.info("Trying to start %s" % vm_entry.uuid)
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if destination_host_key:
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migration_port = find_free_port()
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self.launch_vm(vm_entry, migration=True, migration_port=migration_port,
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destination_host_key=destination_host_key)
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else:
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self.create(vm_entry)
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self.launch_vm(vm_entry)
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@capture_all_exception
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def stop(self, vm_entry):
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vm = self.get_vm(self.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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shared.vm_pool.put(vm_entry)
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self.running_vms.remove(vm)
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delete_vm_network(vm_entry)
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@capture_all_exception
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def delete(self, vm_entry):
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logger.info("Deleting VM | %s", vm_entry)
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self.stop(vm_entry)
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if self.storage_handler.is_vm_image_exists(vm_entry.uuid):
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r_status = self.storage_handler.delete_vm_image(vm_entry.uuid)
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if r_status:
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shared.etcd_client.client.delete(vm_entry.key)
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else:
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shared.etcd_client.client.delete(vm_entry.key)
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@capture_all_exception
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def transfer(self, 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 = self.get_vm(self.running_vms, join_path(settings['etcd']['vm_prefix'], _uuid))
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if vm:
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tunnel = sshtunnel.SSHTunnelForwarder(
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_host,
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ssh_username=settings['ssh']['username'],
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ssh_pkey=settings['ssh']['private_key_path'],
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remote_bind_address=("127.0.0.1", _port),
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ssh_proxy_enabled=True,
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ssh_proxy=(_host, 22)
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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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logger.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:0.0.0.0:{}".format(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 shared.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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self.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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@capture_all_exception
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def launch_vm(self, vm_entry, migration=False, migration_port=None, destination_host_key=None):
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logger.info("Starting %s" % vm_entry.key)
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vm = self.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:
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logger.exception("Error Occured while starting VM")
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vm.handle.shutdown()
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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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pass
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else:
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# Error during typical launch of a vm
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vm.handle.shutdown()
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vm_entry.declare_killed()
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shared.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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self.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_ipv6_address(), "port": migration_port},
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uuid=vm_entry.uuid,
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destination_host_key=destination_host_key,
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request_prefix=settings['etcd']['request_prefix']
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)
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shared.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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shared.vm_pool.put(vm_entry)
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@capture_all_exception
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def maintenance(self, 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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logger.debug("Starting Maintenance!!")
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to_be_removed = []
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for running_vm in self.running_vms:
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with shared.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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self.running_vms.remove(r)
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# To check vm running according to etcd entries
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alleged_running_vms = shared.vm_pool.by_status("RUNNING", shared.vm_pool.by_host(host.key))
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for vm_entry in alleged_running_vms:
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_vm = self.get_vm(self.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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shared.vm_pool.put(vm_entry)
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if _vm:
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self.running_vms.remove(_vm)
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def resolve_network(network_name, network_owner):
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network = shared.etcd_client.get(join_path(settings['etcd']['network_prefix'],
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network_owner,
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network_name),
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value_in_json=True)
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return network
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def delete_vm_network(vm_entry):
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try:
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for network in vm_entry.network:
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network_name = network[0]
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tap_mac = network[1]
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tap_id = network[2]
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delete_network_interface('tap{}'.format(tap_id))
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owners_vms = shared.vm_pool.by_owner(vm_entry.owner)
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owners_running_vms = shared.vm_pool.by_status(VMStatus.running,
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_vms=owners_vms)
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networks = map(
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lambda n: n[0], map(lambda vm: vm.network, owners_running_vms)
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)
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networks_in_use_by_user_vms = [vm[0] for vm in networks]
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if network_name not in networks_in_use_by_user_vms:
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network_entry = resolve_network(network[0], vm_entry.owner)
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if network_entry:
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network_type = network_entry.value["type"]
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network_id = network_entry.value["id"]
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if network_type == "vxlan":
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delete_network_interface('br{}'.format(network_id))
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delete_network_interface('vxlan{}'.format(network_id))
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except Exception:
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logger.exception("Exception in network interface deletion")
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def create_vxlan_br_tap(_id, _dev, tap_id, ip=None):
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network_script_base = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'network')
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vxlan = create_dev(script=os.path.join(network_script_base, 'create-vxlan.sh'),
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_id=_id, dev=_dev)
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if vxlan:
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bridge = create_dev(script=os.path.join(network_script_base, 'create-bridge.sh'),
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_id=_id, dev=vxlan, ip=ip)
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if bridge:
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tap = create_dev(script=os.path.join(network_script_base, 'create-tap.sh'),
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_id=str(tap_id), dev=bridge)
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if tap:
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return tap
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def update_radvd_conf(all_networks):
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network_script_base = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'network')
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networks = {
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net.value['ipv6']: net.value['id']
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for net in all_networks
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if net.value.get('ipv6') and ipaddress.ip_network(net.value.get('ipv6')).is_global
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}
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radvd_template = open(os.path.join(network_script_base,
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'radvd-template.conf'), 'r').read()
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radvd_template = Template(radvd_template)
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content = [
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radvd_template.safe_substitute(
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bridge='br{}'.format(networks[net]),
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prefix=net
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)
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for net in networks if networks.get(net)
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]
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with open('/etc/radvd.conf', 'w') as radvd_conf:
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radvd_conf.writelines(content)
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try:
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sp.check_output(['systemctl', 'restart', 'radvd'])
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except Exception:
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sp.check_output(['service', 'radvd', 'restart'])
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