mravi/uncloud-mravi
1
0
Fork 0
forked from uncloud/uncloud
Code Issues Pull requests Projects Releases Wiki Activity

Merge branch 'master' of code.ungleich.ch:ucloud/ucloud

Browse source
This commit is contained in:
Nico Schottelius 2019-12-08 14:15:40 +01:00
commit 9206d8ed1d
4 changed files with 256 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

152
ucloud/host/main.py.old Executable file
View file

@ -0,0 +1,152 @@
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, env_vars.get('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 env_vars.get('STORAGE_BACKEND') == 'filesystem' and not isdir(env_vars.get('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, env_vars.get('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(env_vars.get('REQUEST_PREFIX'), value_in_json=True),
etcd_client.watch_prefix(env_vars.get('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)

12
ucloud/imagescanner/main.py
View file

@ -3,7 +3,7 @@ import os
import subprocess
from os.path import join as join_path
from ucloud.config import etcd_client, env_vars, image_storage_handler
from ucloud.config import etcd_client, config, image_storage_handler
from ucloud.imagescanner import logger
@ -20,9 +20,9 @@ def qemu_img_type(path):
def check():
""" check whether settings are sane, refuse to start if they aren't """
if env_vars.get('STORAGE_BACKEND') == 'filesystem' and not isdir(env_vars.get('IMAGE_DIR')):
if config['etcd']['STORAGE_BACKEND'] == 'filesystem' and not isdir(config['etcd']['IMAGE_DIR']):
print("You have set STORAGE_BACKEND to filesystem, but "
"{} does not exist. Refusing to start".format(env_vars.get('IMAGE_DIR')))
"{} does not exist. Refusing to start".format(config['etcd']['IMAGE_DIR']))
sys.exit(1)
try:
@ -34,7 +34,7 @@ def check():
def main():
# We want to get images entries that requests images to be created
images = etcd_client.get_prefix(env_vars.get('IMAGE_PREFIX'), value_in_json=True)
images = etcd_client.get_prefix(config['etcd']['IMAGE_PREFIX'], value_in_json=True)
images_to_be_created = list(filter(lambda im: im.value['status'] == 'TO_BE_CREATED', images))
for image in images_to_be_created:
@ -43,9 +43,9 @@ def main():
image_owner = image.value['owner']
image_filename = image.value['filename']
image_store_name = image.value['store_name']
image_full_path = join_path(env_vars.get('BASE_DIR'), image_owner, image_filename)
image_full_path = join_path(config['etcd']['BASE_DIR'], image_owner, image_filename)
image_stores = etcd_client.get_prefix(env_vars.get('IMAGE_STORE_PREFIX'), value_in_json=True)
image_stores = etcd_client.get_prefix(config['etcd']['IMAGE_STORE_PREFIX'], value_in_json=True)
user_image_store = next(filter(
lambda s, store_name=image_store_name: s.value["name"] == store_name,
image_stores

93
ucloud/scheduler/main.py.old Executable file
View file

@ -0,0 +1,93 @@
# TODO
# 1. send an email to an email address defined by env['admin-email']
# if resources are finished
# 2. Introduce a status endpoint of the scheduler -
# maybe expose a prometheus compatible output
from ucloud.common.request import RequestEntry, RequestType
from ucloud.config import etcd_client
from ucloud.config import host_pool, request_pool, vm_pool, env_vars
from .helper import (get_suitable_host, dead_host_mitigation, dead_host_detection,
assign_host, NoSuitableHostFound)
from . import logger
def main():
logger.info("%s SESSION STARTED %s", '*' * 5, '*' * 5)
pending_vms = []
for request_iterator in [
etcd_client.get_prefix(env_vars.get('REQUEST_PREFIX'), value_in_json=True),
etcd_client.watch_prefix(env_vars.get('REQUEST_PREFIX'), timeout=5, value_in_json=True),
]:
for request_event in request_iterator:
request_entry = RequestEntry(request_event)
# Never Run time critical mechanism inside timeout
# mechanism because timeout mechanism only comes
# when no other event is happening. It means under
# heavy load there would not be a timeout event.
if request_entry.type == "TIMEOUT":
# Detect hosts that are dead and set their status
# to "DEAD", and their VMs' status to "KILLED"
dead_hosts = dead_host_detection()
if dead_hosts:
logger.debug("Dead hosts: %s", dead_hosts)
dead_host_mitigation(dead_hosts)
# If there are VMs that weren't assigned a host
# because there wasn't a host available which
# meets requirement of that VM then we would
# create a new ScheduleVM request for that VM
# on our behalf.
while pending_vms:
pending_vm_entry = pending_vms.pop()
r = RequestEntry.from_scratch(type="ScheduleVM",
uuid=pending_vm_entry.uuid,
hostname=pending_vm_entry.hostname,
request_prefix=env_vars.get("REQUEST_PREFIX"))
request_pool.put(r)
elif request_entry.type == RequestType.ScheduleVM:
logger.debug("%s, %s", request_entry.key, request_entry.value)
vm_entry = vm_pool.get(request_entry.uuid)
if vm_entry is None:
logger.info("Trying to act on {} but it is deleted".format(request_entry.uuid))
continue
etcd_client.client.delete(request_entry.key) # consume Request
# If the Request is about a VM which is labelled as "migration"
# and has a destination
if hasattr(request_entry, "migration") and request_entry.migration \
and hasattr(request_entry, "destination") and request_entry.destination:
try:
get_suitable_host(vm_specs=vm_entry.specs,
hosts=[host_pool.get(request_entry.destination)])
except NoSuitableHostFound:
logger.info("Requested destination host doesn't have enough capacity"
"to hold %s" % vm_entry.uuid)
else:
r = RequestEntry.from_scratch(type=RequestType.InitVMMigration,
uuid=request_entry.uuid,
destination=request_entry.destination,
request_prefix=env_vars.get("REQUEST_PREFIX"))
request_pool.put(r)
# If the Request is about a VM that just want to get started/created
else:
# assign_host only returns None when we couldn't be able to assign
# a host to a VM because of resource constraints
try:
assign_host(vm_entry)
except NoSuitableHostFound:
vm_entry.add_log("Can't schedule VM. No Resource Left.")
vm_pool.put(vm_entry)
pending_vms.append(vm_entry)
logger.info("No Resource Left. Emailing admin....")
if __name__ == "__main__":
main()