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這篇文章將為大家詳細講解有關OpenStack Nova調度服務學習及其過濾器編寫的示例分析，小編覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。
$ ps -aux | grep nova | awk '{for(i=11;i<=NF;i++) printf "%s ", $i};NF>=11 {print ""}'
/usr/bin/python /usr/bin/nova-compute --config-file=/etc/nova/nova.conf --config-file=/etc/nova/nova-compute.conf
--log-file=/var/log/nova/nova-compute.log
/usr/bin/python /usr/bin/nova-api --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-api.log
/usr/bin/python /usr/bin/nova-conductor --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-conductor.log
/usr/bin/python /usr/bin/nova-scheduler --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-scheduler.log
/usr/bin/python /usr/bin/nova-consoleauth --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-consoleauth.log
/usr/bin/python /usr/bin/nova-novncproxy --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-novncproxy.log
/usr/bin/python /usr/bin/nova-conductor --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-conductor.log
/usr/bin/python /usr/bin/nova-conductor --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-conductor.log
/usr/bin/python /usr/bin/nova-api --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-api.log
/usr/bin/python /usr/bin/nova-api --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-api.log
/usr/bin/python /usr/bin/nova-api --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-api.log
/usr/bin/python /usr/bin/nova-api --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-api.log
/usr/bin/python2.7 /usr/bin/privsep-helper --config-file /etc/nova/nova.conf --config-file /etc/nova/nova-compute.conf
--privsep_context vif_plug_linux_bridge.privsep.vif_plug --privsep_sock_path /tmp/tmpZtOLbU/privsep.sock
/usr/bin/python2.7 /usr/bin/privsep-helper --config-file /etc/nova/nova.conf --config-file /etc/nova/nova-compute.conf
--privsep_context os_brick.privileged.default --privsep_sock_path /tmp/tmpjXCHkt/privsep.sock
pluma /usr/lib/python2.7/dist-packages/nova/scheduler/filters/retry_filter.py查看所有Nova服務：
$ systemctl list-units | grep nova nova-api.service loaded active running OpenStack Compute API nova-compute.service loaded active running OpenStack Compute nova-conductor.service loaded active running OpenStack Compute Conductor nova-consoleauth.service loaded active running OpenStack Compute Console nova-novncproxy.service loaded active running OpenStack Compute novncproxy nova-scheduler.service loaded active running OpenStack Compute Scheduler
查看服務所屬軟件包：
$ apt-get install apt-file $ apt-file update $ apt-file search /lib/systemd/system/nova-api.service nova-api: /lib/systemd/system/nova-api.service $ apt-file search /lib/systemd/system/nova-compute.service nova-compute: /lib/systemd/system/nova-compute.service $ apt-file search /lib/systemd/system/nova-conductor.service nova-conductor: /lib/systemd/system/nova-conductor.service $ apt-file search /lib/systemd/system/nova-consoleauth.service nova-consoleauth: /lib/systemd/system/nova-consoleauth.service $ apt-file search /lib/systemd/system/nova-novncproxy.service nova-novncproxy: /lib/systemd/system/nova-novncproxy.service $ apt-file search /lib/systemd/system/nova-scheduler.service nova-scheduler: /lib/systemd/system/nova-scheduler.service
查看Nova調度器服務狀態：
$ systemctl status nova-scheduler.service ● nova-scheduler.service - OpenStack Compute Scheduler Loaded: loaded (/lib/systemd/system/nova-scheduler.service; enabled; vendor preset: enabled) Active: active (running) since 三 2017-12-06 23:23:39 CST; 10h ago Process: 3150 ExecStartPre=/bin/chown nova:adm /var/log/nova (code=exited, status=0/SUCCESS) Process: 3076 ExecStartPre=/bin/chown nova:nova /var/lock/nova /var/lib/nova (code=exited, status=0/SUCCESS) Process: 3016 ExecStartPre=/bin/mkdir -p /var/lock/nova /var/log/nova /var/lib/nova (code=exited, status=0/SUCCESS) Main PID: 3241 (nova-scheduler) CGroup: /system.slice/nova-scheduler.service └─3241 /usr/bin/python /usr/bin/nova-scheduler --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-scheduler. 12月 07 09:59:13 UbuntuStack nova-scheduler[3241]: 2017-12-07 09:59:13.690 3241 INFO nova.scheduler.host_manager [req-27631738-6333- ...
查看Nova調度器服務配置腳本：
$ cat /lib/systemd/system/nova-scheduler.service [Unit] Description=OpenStack Compute Scheduler After=postgresql.service mysql.service keystone.service [Service] User=nova Group=nova Type=simple WorkingDirectory=/var/lib/nova PermissionsStartOnly=true ExecStartPre=/bin/mkdir -p /var/lock/nova /var/log/nova /var/lib/nova ExecStartPre=/bin/chown nova:nova /var/lock/nova /var/lib/nova ExecStartPre=/bin/chown nova:adm /var/log/nova ExecStart=/etc/init.d/nova-scheduler systemd-start Restart=on-failure LimitNOFILE=65535 TimeoutStopSec=15 [Install] WantedBy=multi-user.target
查看Nove調度器服務init腳本：
$ cat /etc/init.d/nova-scheduler
#!/bin/sh
### BEGIN INIT INFO
# Provides: nova-scheduler
# Required-Start: $network $local_fs $remote_fs $syslog
# Required-Stop: $remote_fs
# Should-Start: postgresql mysql keystone
# Should-Stop: postgresql mysql keystone
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Nova Scheduler
# Description: Schedules instances, volumes, etc. for Nova
### END INIT INFO
# Author: Julien Danjou <acid@debian.org>
DESC="OpenStack Compute Scheduler"
PROJECT_NAME=nova
NAME=nova-scheduler
...
if [ -z "${DAEMON}" ] ; then
DAEMON=/usr/bin/${NAME}
fi
...
if [ -z "${NO_OPENSTACK_CONFIG_FILE_DAEMON_ARG}" ] ; then
DAEMON_ARGS="--config-file=${CONFIG_FILE} ${DAEMON_ARGS}"
fi
...
do_systemd_start() {
exec $DAEMON $DAEMON_ARGS
}
...
systemd-start)
do_systemd_start
;;
...
exit 0查看Nova調度器啟動腳本：
$ cat /usr/bin/nova-scheduler #!/usr/bin/python # PBR Generated from u'console_scripts' import sys from nova.cmd.scheduler import main if __name__ == "__main__": sys.exit(main())
查看系統中Nova相關軟件包狀態：
$ dpkg -l "*nova*" 期望狀態=未知(u)/安裝(i)/刪除(r)/清除(p)/保持(h) | 狀態=未安裝(n)/已安裝(i)/僅存配置(c)/僅解壓縮(U)/配置失敗(F)/不完全安裝(H)/觸發器等待(W)/觸發器未決(T) |/ 錯誤?=(無)/須重裝(R) (狀態，錯誤：大寫=故障) ||/ 名稱 版本 體系結構： 描述 +++-=========================-=================-=================-======================================================= ii nova-api 2:14.0.1-0ubuntu1 all OpenStack Compute - API frontend hi nova-common 2:14.0.1-0ubuntu1 all OpenStack Compute - common files ii nova-compute 2:14.0.1-0ubuntu1 all OpenStack Compute - compute node base un nova-compute-hypervisor <無> <無> (無可用描述) ii nova-compute-kvm 2:14.0.1-0ubuntu1 all OpenStack Compute - compute node (KVM) ii nova-compute-libvirt 2:14.0.1-0ubuntu1 all OpenStack Compute - compute node libvirt support ii nova-conductor 2:14.0.1-0ubuntu1 all OpenStack Compute - conductor service un nova-console <無> <無> (無可用描述) ii nova-consoleauth 2:14.0.1-0ubuntu1 all OpenStack Compute - Console Authenticator ii nova-novncproxy 2:14.0.1-0ubuntu1 all OpenStack Compute - NoVNC proxy ii nova-scheduler 2:14.0.1-0ubuntu1 all OpenStack Compute - virtual machine scheduler hi python-nova 2:14.0.1-0ubuntu1 all OpenStack Compute Python libraries ii python-novaclient 2:6.0.0-0ubuntu1~ all client library for OpenStack Compute API - Python 2.7 un python2.7-nova <無> <無> (無可用描述)
查看Nova的Python源碼所屬軟件包：
$ apt-file search /usr/lib/python2.7/dist-packages/nova* | awk -F '/' '{print $1 $6}' | sort -u
python-nova-adminclient: nova_adminclient
python-nova-adminclient: nova_adminclient-0.1.8.egg-info
python-novaclient: novaclient
python-nova-lxd: nova
python-nova-lxd: nova_lxd
python-nova-lxd: nova_lxd-13.0.0.egg-info
python-nova-lxd: nova_lxd-13.0.0-nspkg.pth
python-nova-lxd: nova_lxd-13.2.0.egg-info
python-nova-lxd: nova_lxd-13.2.0-nspkg.pth
python-nova-lxd: nova_lxd-13.3.0.egg-info
python-nova-lxd: nova_lxd-13.3.0-nspkg.pth
python-nova-lxd: nova_lxd-14.2.2.egg-info
python-nova: nova
python-nova: nova-13.0.0.egg-info
python-nova: nova-13.1.4.egg-info
python-nova: nova-14.0.8.egg-info查看nova-scheduler軟件包依賴和文件列表：
$ apt-cache show nova-scheduler Package: nova-scheduler Source: nova Priority: extra Section: net Installed-Size: 56 Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com> Architecture: all Version: 2:14.0.8-0ubuntu1~cloud1 Depends: nova-common (= 2:14.0.8-0ubuntu1~cloud1), init-system-helpers (>= 1.18~), lsb-base (>= 4.1+Debian11ubuntu7), python:any (>= 2.7~) Supported: 24m Filename: pool/main/n/nova/nova-scheduler_14.0.8-0ubuntu1~cloud1_all.deb Size: 6460 SHA256: 133a23ea0ab69e08716e117aa5881c7840d0431c29fc0cba9fd7146180460965 SHA1: 41649a1311faa52fe539a293670dd58a79fd200b MD5sum: bc448ccba9626103924c086c30012d7e Description-en: OpenStack Compute - virtual machine scheduler OpenStack is a reliable cloud infrastructure. Its mission is to produce the ubiquitous cloud computing platform that will meet the needs of public and private cloud providers regardless of size, by being simple to implement and massively scalable. . OpenStack Compute, codenamed Nova, is a cloud computing fabric controller. In addition to its "native" API (the OpenStack API), it also supports the Amazon EC2 API. . Nova is intended to be modular and easy to extend and adapt. It supports many different hypervisors (KVM and Xen to name a few), different database backends (SQLite, MySQL, and PostgreSQL, for instance), different types of user databases (LDAP or SQL), etc. . This is the Nova scheduler. Description-md5: 8edec11a409c894d59bffef4d16d21b6 Original-Maintainer: Openstack Maintainers <openstack@lists.launchpad.net> ... $ dpkg -L nova-scheduler /. /usr /usr/bin /usr/bin/nova-scheduler /usr/share /usr/share/man /usr/share/man/man1 /usr/share/man/man1/nova-scheduler.1.gz /usr/share/doc /usr/share/doc/nova-scheduler /usr/share/doc/nova-scheduler/copyright /etc /etc/init.d /etc/init.d/nova-scheduler /etc/init /etc/init/nova-scheduler.conf /lib /lib/systemd /lib/systemd/system /lib/systemd/system/nova-scheduler.service /usr/share/doc/nova-scheduler/changelog.Debian.gz
查看nova-common軟件包依賴和文件列表：
$ apt-cache show nova-common Package: nova-common Source: nova Priority: extra Section: net Installed-Size: 79 Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com> Architecture: all Version: 2:14.0.8-0ubuntu1~cloud1 Recommends: python-glanceclient, python-keystone Depends: adduser, python-nova (= 2:14.0.8-0ubuntu1~cloud1), python:any (>= 2.7~) Supported: 24m Filename: pool/main/n/nova/nova-common_14.0.8-0ubuntu1~cloud1_all.deb ... $ dpkg -L nova-common /. /usr /usr/bin /usr/bin/nova-rootwrap /usr/bin/nova-policy /usr/bin/nova-rootwrap-daemon /usr/bin/nova-manage /usr/share /usr/share/man /usr/share/man/man1 /usr/share/man/man1/nova-rootwrap.1.gz /usr/share/man/man1/nova-manage.1.gz /usr/share/doc /usr/share/doc/nova-common /usr/share/doc/nova-common/copyright /etc /etc/nova /etc/nova/policy.json /etc/nova/api-paste.ini /etc/nova/nova.conf /etc/nova/rootwrap.d /etc/nova/rootwrap.conf /etc/nova/logging.conf /etc/logrotate.d /etc/logrotate.d/nova-common /etc/sudoers.d /etc/sudoers.d/nova_sudoers /var /var/log /var/log/nova /var/lib /var/lib/nova /var/lib/nova/CA /var/lib/nova/CA/INTER /var/lib/nova/CA/private /var/lib/nova/CA/newcerts /var/lib/nova/CA/reqs /var/lib/nova/instances /var/lib/nova/buckets /var/lib/nova/keys /var/lib/nova/tmp /var/lib/nova/images /var/lib/nova/networks /usr/share/doc/nova-common/changelog.Debian.gz
查看python-nova軟件包依賴和文件列表：
$ apt-cache show python-nova Package: python-nova Source: nova Priority: extra Section: python Installed-Size: 22286 Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com> Architecture: all Version: 2:14.0.8-0ubuntu1~cloud1 Suggests: python-ldap Provides: python2.7-nova Depends: alembic (>= 0.8.0), openssh-client, openssl, python-babel (>= 2.3.4), python-boto (>= 2.32.1), python-castellan (>= 0.4.0), python-cinderclient (>= 1:1.6.0), python-cryptography (>= 1.0), python-decorator (>= 3.4.0), python-eventlet (>= 0.18.2), python-glanceclient (>= 1:2.0.0), python-greenlet (>= 0.3.2), python-iso8601 (>= 0.1.11), python-jinja2 (>= 2.8), python-jsonschema (>= 2.0.0), python-keystoneauth2 (>= 2.7.0), python-keystonemiddleware (>= 4.0.0), python-lxml (>= 2.3), python-microversion-parse (>= 0.1.2), python-migrate (>= 0.9.6), python-netaddr (>= 0.7.13), python-netifaces (>= 0.10.4), python-neutronclient (>= 4.2.0), python-os-brick (>= 1.6.1), python-os-vif (>= 1.1.0), python-os-win (>= 0.2.3), python-oslo.cache (>= 1.5.0), python-oslo.concurrency (>= 3.8.0), python-oslo.config (>= 1:3.10.0), python-oslo.context (>= 2.4.0), python-oslo.db (>= 4.1.0), python-oslo.i18n (>= 2.1.0), python-oslo.log (>= 3.16.0), python-oslo.messaging (>= 5.2.0), python-oslo.middleware (>= 3.0.0), python-oslo.policy (>= 1.9.0), python-oslo.privsep (>= 1.9.0), python-oslo.reports (>= 0.6.0), python-oslo.rootwrap (>= 2.0.0), python-oslo.serialization (>= 1.10.0), python-oslo.service (>= 1.10.0), python-oslo.utils (>= 3.11.0), python-oslo.versionedobjects (>= 1.9.1), python-paramiko (>= 1.16.0), python-paste, python-pastedeploy (>= 1.5.0), python-prettytable (>= 0.7), python-psutil (>= 1.1.1), python-pymysql, python-requests (>= 2.10.0), python-rfc3986 (>= 0.2.2), python-routes (>= 1.12.3), python-setuptools (>= 16.0), python-six (>= 1.9.0), python-sqlalchemy (>= 1.0.10), python-stevedore (>= 1.10.0), python-webob (>= 1.2.3), python-pbr, python-pkg-resources, python-sqlalchemy (< 1.1), python:any (< 2.8), python:any (>= 2.7.5-5~) Conflicts: python-cjson Supported: 24m Filename: pool/main/n/nova/python-nova_14.0.8-0ubuntu1~cloud1_all.deb Size: 2573388 SHA256: 9656466b5daff7af684cd1032e2e5d72ab415aa82a0f8cadf0106cfe9ea36096 SHA1: 67dc9bf0bd71a03d87e87b1082bf1892a635f007 MD5sum: 5301e37eacef81b4519a4bcd418ef9be Description-en: OpenStack Compute Python libraries OpenStack is a reliable cloud infrastructure. Its mission is to produce the ubiquitous cloud computing platform that will meet the needs of public and private cloud providers regardless of size, by being simple to implement and massively scalable. . OpenStack Compute, codenamed Nova, is a cloud computing fabric controller. In addition to its "native" API (the OpenStack API), it also supports the Amazon EC2 API. . Nova is intended to be modular and easy to extend and adapt. It supports many different hypervisors (KVM and Xen to name a few), different database backends (SQLite, MySQL, and PostgreSQL, for instance), different types of user databases (LDAP or SQL), etc. . This package contains the core Python parts of Nova. Description-md5: 9e7471c108af7843da4a920afe750d19 Python-Version: 2.7 Original-Maintainer: Openstack Maintainers <openstack@lists.launchpad.net> ... $ dpkg -L python-nova /. /usr /usr/share /usr/share/apport /usr/share/apport/package-hooks /usr/share/apport/package-hooks/source_nova.py /usr/share/doc /usr/share/doc/python-nova /usr/share/doc/python-nova/changelog.Debian.gz /usr/share/doc/python-nova/copyright /usr/lib /usr/lib/python2.7 /usr/lib/python2.7/dist-packages /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/dependency_links.txt /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/top_level.txt /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/not-zip-safe /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/requires.txt /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/pbr.json /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/PKG-INFO /usr/lib/python2.7/dist-packages/nova-14.0.1.egg-info/entry_points.txt /usr/lib/python2.7/dist-packages/nova ...
systemd服務啟動（/lib/systemd/system/nova-scheduler.service）：
ExecStart=/etc/init.d/nova-scheduler systemd-start
init服務啟動（/lib/systemd/system/nova-scheduler.service）：
NAME=nova-scheduler
DAEMON=/usr/bin/${NAME}
DAEMON_ARGS="--config-file=${CONFIG_FILE} ${DAEMON_ARGS}"
exec $DAEMON $DAEMON_ARGS執行的最終命令為：
/usr/bin/python /usr/bin/nova-scheduler --config-file=/etc/nova/nova.conf --log-file=/var/log/nova/nova-scheduler.log
Nova調度器啟動源碼（/usr/bin/nova-scheduler）：
import sys from nova.cmd.scheduler import main if __name__ == "__main__": sys.exit(main())
虛擬機創建時通過RPC調用nova-scheduler服務的select_destinations方法，獲取可用節點列表。
conductor/manager.py ComputeTaskManager的build_instances方法創建一個新的虛擬機實例時，使用scheduler的build_request_spec方法構造請求的資源規格，最終使用RPC調用select_destinations方法選擇合適的節點。
...
from nova.scheduler import utils as scheduler_utils
...
class ComputeTaskManager(base.Base):
...
def build_instances(self, context, instances, image, filter_properties,
admin_password, injected_files, requested_networks,
security_groups, block_device_mapping=None, legacy_bdm=True):
# TODO(ndipanov): Remove block_device_mapping and legacy_bdm in version
# 2.0 of the RPC API.
# TODO(danms): Remove this in version 2.0 of the RPC API
if (requested_networks and
not isinstance(requested_networks,
objects.NetworkRequestList)):
requested_networks = objects.NetworkRequestList.from_tuples(
requested_networks)
# TODO(melwitt): Remove this in version 2.0 of the RPC API
flavor = filter_properties.get('instance_type')
if flavor and not isinstance(flavor, objects.Flavor):
# Code downstream may expect extra_specs to be populated since it
# is receiving an object, so lookup the flavor to ensure this.
flavor = objects.Flavor.get_by_id(context, flavor['id'])
filter_properties = dict(filter_properties, instance_type=flavor)
request_spec = {}
try:
# check retry policy. Rather ugly use of instances[0]...
# but if we've exceeded max retries... then we really only
# have a single instance.
scheduler_utils.populate_retry(
filter_properties, instances[0].uuid)
request_spec = scheduler_utils.build_request_spec(
context, image, instances)
hosts = self._schedule_instances(
context, request_spec, filter_properties)
except Exception as exc:
updates = {'vm_state': vm_states.ERROR, 'task_state': None}
for instance in instances:
self._set_vm_state_and_notify(
context, instance.uuid, 'build_instances', updates,
exc, request_spec)
try:
# If the BuildRequest stays around then instance show/lists
# will pull from it rather than the errored instance.
self._destroy_build_request(context, instance)
except exception.BuildRequestNotFound:
pass
self._cleanup_allocated_networks(
context, instance, requested_networks)
return
for (instance, host) in six.moves.zip(instances, hosts):
try:
instance.refresh()
except (exception.InstanceNotFound,
exception.InstanceInfoCacheNotFound):
LOG.debug('Instance deleted during build', instance=instance)
continue
local_filter_props = copy.deepcopy(filter_properties)
scheduler_utils.populate_filter_properties(local_filter_props,
host)
# The block_device_mapping passed from the api doesn't contain
# instance specific information
bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
# This is populated in scheduler_utils.populate_retry
num_attempts = local_filter_props.get('retry',
{}).get('num_attempts', 1)
if num_attempts <= 1:
# If this is a reschedule the instance is already mapped to
# this cell and the BuildRequest is already deleted so ignore
# the logic below.
inst_mapping = self._populate_instance_mapping(context,
instance,
host)
try:
self._destroy_build_request(context, instance)
except exception.BuildRequestNotFound:
# This indicates an instance delete has been requested in
# the API. Stop the build, cleanup the instance_mapping and
# potentially the block_device_mappings
# TODO(alaski): Handle block_device_mapping cleanup
if inst_mapping:
inst_mapping.destroy()
return
self.compute_rpcapi.build_and_run_instance(context,
instance=instance, host=host['host'], image=image,
request_spec=request_spec,
filter_properties=local_filter_props,
admin_password=admin_password,
injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=bdms, node=host['nodename'],
limits=host['limits'])
def _schedule_instances(self, context, request_spec, filter_properties):
scheduler_utils.setup_instance_group(context, request_spec,
filter_properties)
# TODO(sbauza): Hydrate here the object until we modify the
# scheduler.utils methods to directly use the RequestSpec object
spec_obj = objects.RequestSpec.from_primitives(
context, request_spec, filter_properties)
hosts = self.scheduler_client.select_destinations(context, spec_obj)
return hosts
...scheduler/client/init.py 加載RPC客戶端類。
class SchedulerClient(object): """Client library for placing calls to the scheduler.""" def __init__(self): self.queryclient = LazyLoader(importutils.import_class( 'nova.scheduler.client.query.SchedulerQueryClient')) self.reportclient = LazyLoader(importutils.import_class( 'nova.scheduler.client.report.SchedulerReportClient')) @utils.retry_select_destinations def select_destinations(self, context, spec_obj): return self.queryclient.select_destinations(context, spec_obj) ...
scheduler/client/query.py 獲取RPC調用接口。
from nova.scheduler import rpcapi as scheduler_rpcapi class SchedulerQueryClient(object): """Client class for querying to the scheduler.""" def __init__(self): self.scheduler_rpcapi = scheduler_rpcapi.SchedulerAPI() def select_destinations(self, context, spec_obj): """Returns destinations(s) best suited for this request_spec and filter_properties. The result should be a list of dicts with 'host', 'nodename' and 'limits' as keys. """ return self.scheduler_rpcapi.select_destinations(context, spec_obj) ...
scheduler/rpcapi.py 執行RPC調用。
class SchedulerAPI(object):
...
def select_destinations(self, ctxt, spec_obj):
version = '4.3'
msg_args = {'spec_obj': spec_obj}
if not self.client.can_send_version(version):
del msg_args['spec_obj']
msg_args['request_spec'] = spec_obj.to_legacy_request_spec_dict()
msg_args['filter_properties'
] = spec_obj.to_legacy_filter_properties_dict()
version = '4.0'
cctxt = self.client.prepare(version=version)
return cctxt.call(ctxt, 'select_destinations', **msg_args)
...cmd/scheduler.py 使用“Service”類創建nova-scheduler服務。
CONF = nova.conf.CONF def main(): config.parse_args(sys.argv) logging.setup(CONF, "nova") utils.monkey_patch() objects.register_all() gmr.TextGuruMeditation.setup_autorun(version) server = service.Service.create(binary='nova-scheduler', topic=CONF.scheduler_topic) service.serve(server) service.wait()
conf/scheduler.py nova-scheduler的RPC主題默認為“scheduler”。
rpc_sched_topic_opt = cfg.StrOpt("scheduler_topic",
default="scheduler",
help="""
This is the message queue topic that the scheduler 'listens' on. It is used
when the scheduler service is started up to configure the queue, and whenever
an RPC call to the scheduler is made. There is almost never any reason to ever
change this value.
* Related options:
None
""")
...service.py 從“manager_cls = ('%s_manager' %”可以看出，使用“scheduler_manager”參數所指定的類處理RPC服務請求。
...
class Service(service.Service):
"""Service object for binaries running on hosts.
A service takes a manager and enables rpc by listening to queues based
on topic. It also periodically runs tasks on the manager and reports
its state to the database services table.
"""
def __init__(self, host, binary, topic, manager, report_interval=None,
periodic_enable=None, periodic_fuzzy_delay=None,
periodic_interval_max=None, db_allowed=True,
*args, **kwargs):
super(Service, self).__init__()
self.host = host
self.binary = binary
self.topic = topic
self.manager_class_name = manager
self.servicegroup_api = servicegroup.API()
manager_class = importutils.import_class(self.manager_class_name)
self.manager = manager_class(host=self.host, *args, **kwargs)
self.rpcserver = None
self.report_interval = report_interval
self.periodic_enable = periodic_enable
self.periodic_fuzzy_delay = periodic_fuzzy_delay
self.periodic_interval_max = periodic_interval_max
self.saved_args, self.saved_kwargs = args, kwargs
self.backdoor_port = None
self.conductor_api = conductor.API(use_local=db_allowed)
self.conductor_api.wait_until_ready(context.get_admin_context())
...
@classmethod
def create(cls, host=None, binary=None, topic=None, manager=None,
report_interval=None, periodic_enable=None,
periodic_fuzzy_delay=None, periodic_interval_max=None,
db_allowed=True):
"""Instantiates class and passes back application object.
:param host: defaults to CONF.host
:param binary: defaults to basename of executable
:param topic: defaults to bin_name - 'nova-' part
:param manager: defaults to CONF.<topic>_manager
:param report_interval: defaults to CONF.report_interval
:param periodic_enable: defaults to CONF.periodic_enable
:param periodic_fuzzy_delay: defaults to CONF.periodic_fuzzy_delay
:param periodic_interval_max: if set, the max time to wait between runs
"""
if not host:
host = CONF.host
if not binary:
binary = os.path.basename(sys.argv[0])
if not topic:
topic = binary.rpartition('nova-')[2]
if not manager:
manager_cls = ('%s_manager' %
binary.rpartition('nova-')[2])
manager = CONF.get(manager_cls, None)
if report_interval is None:
report_interval = CONF.report_interval
if periodic_enable is None:
periodic_enable = CONF.periodic_enable
if periodic_fuzzy_delay is None:
periodic_fuzzy_delay = CONF.periodic_fuzzy_delay
debugger.init()
service_obj = cls(host, binary, topic, manager,
report_interval=report_interval,
periodic_enable=periodic_enable,
periodic_fuzzy_delay=periodic_fuzzy_delay,
periodic_interval_max=periodic_interval_max,
db_allowed=db_allowed)
return service_obj
...config/service.py “scheduler_manager”參數的默認值為“nova.scheduler.manager.SchedulerManager”。
...
service_opts = [
...
cfg.StrOpt('scheduler_manager',
default='nova.scheduler.manager.SchedulerManager',
help='DEPRECATED: Full class name for the Manager for '
'scheduler',
deprecated_for_removal=True),
...scheduler/manager.py 設定默認調度驅動為“filter_scheduler”。
class SchedulerManager(manager.Manager):
"""Chooses a host to run instances on."""
target = messaging.Target(version='4.3')
_sentinel = object()
def __init__(self, scheduler_driver=None, *args, **kwargs):
if not scheduler_driver:
scheduler_driver = CONF.scheduler_driver
try:
self.driver = driver.DriverManager(
"nova.scheduler.driver",
scheduler_driver,
invoke_on_load=True).driver
# TODO(Yingxin): Change to catch stevedore.exceptions.NoMatches after
# stevedore v1.9.0
except RuntimeError:
# NOTE(Yingxin): Loading full class path is deprecated and should
# be removed in the N release.
try:
self.driver = importutils.import_object(scheduler_driver)
LOG.warning(_LW("DEPRECATED: scheduler_driver uses "
"classloader to load %(path)s. This legacy "
"loading style will be removed in the "
"N release."),
{'path': scheduler_driver})
except (ImportError, ValueError):
raise RuntimeError(
_("Cannot load scheduler driver from configuration "
"%(conf)s."),
{'conf': scheduler_driver})
super(SchedulerManager, self).__init__(service_name='scheduler',
*args, **kwargs)
...
@messaging.expected_exceptions(exception.NoValidHost)
def select_destinations(self, ctxt,
request_spec=None, filter_properties=None,
spec_obj=_sentinel):
"""Returns destinations(s) best suited for this RequestSpec.
The result should be a list of dicts with 'host', 'nodename' and
'limits' as keys.
"""
# TODO(sbauza): Change the method signature to only accept a spec_obj
# argument once API v5 is provided.
if spec_obj is self._sentinel:
spec_obj = objects.RequestSpec.from_primitives(ctxt,
request_spec,
filter_properties)
dests = self.driver.select_destinations(ctxt, spec_obj)
return jsonutils.to_primitive(dests)
...conf/scheduler.py 默認“scheduler_driver”為“filter_scheduler”，最終的RPC請求將會使用filter_scheduler包中的FilterScheduler類來實現。
driver_opt = cfg.StrOpt("scheduler_driver",
default="filter_scheduler",
help="""
The class of the driver used by the scheduler. This should be chosen from one
of the entrypoints under the namespace 'nova.scheduler.driver' of file
'setup.cfg'. If nothing is specified in this option, the 'filter_scheduler' is
used.
This option also supports deprecated full Python path to the class to be used.
For example, "nova.scheduler.filter_scheduler.FilterScheduler". But note: this
support will be dropped in the N Release.
Other options are:
* 'caching_scheduler' which aggressively caches the system state for better
individual scheduler performance at the risk of more retries when running
multiple schedulers.
* 'chance_scheduler' which simply picks a host at random.
* 'fake_scheduler' which is used for testing.
* Related options:
None
""")FilterScheduler.select_destinations選擇目標節點的關鍵步驟如下：
使用self.host_manager.get_all_host_states獲取所有節點狀態，
使用self.host_manager.get_filtered_hosts獲取所有過濾后的節點，
使用self.host_manager.get_weighed_hosts計算可用節點的權重，最后留下權重最高的節點，
如果有多個則使用random.choice隨機選擇一個，
同時使用chosen_host.obj.consume_from_request修改該節點的權重。
scheduler/filter_scheduler.py 過濾符合請求的節點。
class FilterScheduler(driver.Scheduler):
"""Scheduler that can be used for filtering and weighing."""
def __init__(self, *args, **kwargs):
super(FilterScheduler, self).__init__(*args, **kwargs)
self.options = scheduler_options.SchedulerOptions()
self.notifier = rpc.get_notifier('scheduler')
def select_destinations(self, context, spec_obj):
"""Selects a filtered set of hosts and nodes."""
self.notifier.info(
context, 'scheduler.select_destinations.start',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
num_instances = spec_obj.num_instances
selected_hosts = self._schedule(context, spec_obj)
# Couldn't fulfill the request_spec
if len(selected_hosts) < num_instances:
# NOTE(Rui Chen): If multiple creates failed, set the updated time
# of selected HostState to None so that these HostStates are
# refreshed according to database in next schedule, and release
# the resource consumed by instance in the process of selecting
# host.
for host in selected_hosts:
host.obj.updated = None
# Log the details but don't put those into the reason since
# we don't want to give away too much information about our
# actual environment.
LOG.debug('There are %(hosts)d hosts available but '
'%(num_instances)d instances requested to build.',
{'hosts': len(selected_hosts),
'num_instances': num_instances})
reason = _('There are not enough hosts available.')
raise exception.NoValidHost(reason=reason)
dests = [dict(host=host.obj.host, nodename=host.obj.nodename,
limits=host.obj.limits) for host in selected_hosts]
self.notifier.info(
context, 'scheduler.select_destinations.end',
dict(request_spec=spec_obj.to_legacy_request_spec_dict()))
return dests
def _get_configuration_options(self):
"""Fetch options dictionary. Broken out for testing."""
return self.options.get_configuration()
def _schedule(self, context, spec_obj):
"""Returns a list of hosts that meet the required specs,
ordered by their fitness.
"""
elevated = context.elevated()
config_options = self._get_configuration_options()
# Find our local list of acceptable hosts by repeatedly
# filtering and weighing our options. Each time we choose a
# host, we virtually consume resources on it so subsequent
# selections can adjust accordingly.
# Note: remember, we are using an iterator here. So only
# traverse this list once. This can bite you if the hosts
# are being scanned in a filter or weighing function.
hosts = self._get_all_host_states(elevated)
selected_hosts = []
num_instances = spec_obj.num_instances
# NOTE(sbauza): Adding one field for any out-of-tree need
spec_obj.config_options = config_options
for num in range(num_instances):
# Filter local hosts based on requirements ...
hosts = self.host_manager.get_filtered_hosts(hosts,
spec_obj, index=num)
if not hosts:
# Can't get any more locally.
break
LOG.debug("Filtered %(hosts)s", {'hosts': hosts})
weighed_hosts = self.host_manager.get_weighed_hosts(hosts,
spec_obj)
LOG.debug("Weighed %(hosts)s", {'hosts': weighed_hosts})
scheduler_host_subset_size = max(1,
CONF.scheduler_host_subset_size)
if scheduler_host_subset_size < len(weighed_hosts):
weighed_hosts = weighed_hosts[0:scheduler_host_subset_size]
chosen_host = random.choice(weighed_hosts)
LOG.debug("Selected host: %(host)s", {'host': chosen_host})
selected_hosts.append(chosen_host)
# Now consume the resources so the filter/weights
# will change for the next instance.
chosen_host.obj.consume_from_request(spec_obj)
if spec_obj.instance_group is not None:
spec_obj.instance_group.hosts.append(chosen_host.obj.host)
# hosts has to be not part of the updates when saving
spec_obj.instance_group.obj_reset_changes(['hosts'])
return selected_hosts
def _get_all_host_states(self, context):
"""Template method, so a subclass can implement caching."""
return self.host_manager.get_all_host_states(context)
...scheduler/driver.py FilterScheduler的父類初始化“host_manager”為“nova.scheduler.host_manager”。
class Scheduler(object): """The base class that all Scheduler classes should inherit from.""" def __init__(self): self.host_manager = driver.DriverManager( "nova.scheduler.host_manager", CONF.scheduler_host_manager, invoke_on_load=True).driver self.servicegroup_api = servicegroup.API() ...
FilterScheduler的_get_all_host_states方法調用host_manager.get_all_host_states獲取所有主機狀態。
scheduler/host_manager.py 遍歷所有計算節點，使用HostManager類的update方法更新狀態，并放在host_state_map緩存中。
...
class HostManager(object):
...
def host_state_cls(self, host, node, **kwargs):
return HostState(host, node)
...
def get_all_host_states(self, context):
"""Returns a list of HostStates that represents all the hosts
the HostManager knows about. Also, each of the consumable resources
in HostState are pre-populated and adjusted based on data in the db.
"""
service_refs = {service.host: service
for service in objects.ServiceList.get_by_binary(
context, 'nova-compute', include_disabled=True)}
# Get resource usage across the available compute nodes:
compute_nodes = objects.ComputeNodeList.get_all(context)
seen_nodes = set()
for compute in compute_nodes:
service = service_refs.get(compute.host)
if not service:
LOG.warning(_LW(
"No compute service record found for host %(host)s"),
{'host': compute.host})
continue
host = compute.host
node = compute.hypervisor_hostname
state_key = (host, node)
host_state = self.host_state_map.get(state_key)
if not host_state:
host_state = self.host_state_cls(host, node, compute=compute)
self.host_state_map[state_key] = host_state
# We force to update the aggregates info each time a new request
# comes in, because some changes on the aggregates could have been
# happening after setting this field for the first time
host_state.update(compute,
dict(service),
self._get_aggregates_info(host),
self._get_instance_info(context, compute))
seen_nodes.add(state_key)
# remove compute nodes from host_state_map if they are not active
dead_nodes = set(self.host_state_map.keys()) - seen_nodes
for state_key in dead_nodes:
host, node = state_key
LOG.info(_LI("Removing dead compute node %(host)s:%(node)s "
"from scheduler"), {'host': host, 'node': node})
del self.host_state_map[state_key]
return six.itervalues(self.host_state_map)scheduler/host_manager.py 調用nova.scheduler.filters.HostFilterHandler的get_filtered_hosts方法進行節點過濾。
...
from nova.scheduler import filters
...
class HostManager(object):
"""Base HostManager class."""
# Can be overridden in a subclass
def host_state_cls(self, host, node, **kwargs):
return HostState(host, node)
def __init__(self):
self.host_state_map = {}
self.filter_handler = filters.HostFilterHandler()
filter_classes = self.filter_handler.get_matching_classes(
CONF.scheduler_available_filters)
self.filter_cls_map = {cls.__name__: cls for cls in filter_classes}
self.filter_obj_map = {}
self.default_filters = self._choose_host_filters(self._load_filters())
self.weight_handler = weights.HostWeightHandler()
weigher_classes = self.weight_handler.get_matching_classes(
CONF.scheduler_weight_classes)
self.weighers = [cls() for cls in weigher_classes]
# Dict of aggregates keyed by their ID
self.aggs_by_id = {}
# Dict of set of aggregate IDs keyed by the name of the host belonging
# to those aggregates
self.host_aggregates_map = collections.defaultdict(set)
self._init_aggregates()
self.tracks_instance_changes = CONF.scheduler_tracks_instance_changes
# Dict of instances and status, keyed by host
self._instance_info = {}
if self.tracks_instance_changes:
self._init_instance_info()
...
def get_filtered_hosts(self, hosts, spec_obj, index=0):
"""Filter hosts and return only ones passing all filters."""
def _strip_ignore_hosts(host_map, hosts_to_ignore):
ignored_hosts = []
for host in hosts_to_ignore:
for (hostname, nodename) in list(host_map.keys()):
if host.lower() == hostname.lower():
del host_map[(hostname, nodename)]
ignored_hosts.append(host)
ignored_hosts_str = ', '.join(ignored_hosts)
LOG.info(_LI('Host filter ignoring hosts: %s'), ignored_hosts_str)
def _match_forced_hosts(host_map, hosts_to_force):
forced_hosts = []
lowered_hosts_to_force = [host.lower() for host in hosts_to_force]
for (hostname, nodename) in list(host_map.keys()):
if hostname.lower() not in lowered_hosts_to_force:
del host_map[(hostname, nodename)]
else:
forced_hosts.append(hostname)
if host_map:
forced_hosts_str = ', '.join(forced_hosts)
msg = _LI('Host filter forcing available hosts to %s')
else:
forced_hosts_str = ', '.join(hosts_to_force)
msg = _LI("No hosts matched due to not matching "
"'force_hosts' value of '%s'")
LOG.info(msg % forced_hosts_str)
def _match_forced_nodes(host_map, nodes_to_force):
forced_nodes = []
for (hostname, nodename) in list(host_map.keys()):
if nodename not in nodes_to_force:
del host_map[(hostname, nodename)]
else:
forced_nodes.append(nodename)
if host_map:
forced_nodes_str = ', '.join(forced_nodes)
msg = _LI('Host filter forcing available nodes to %s')
else:
forced_nodes_str = ', '.join(nodes_to_force)
msg = _LI("No nodes matched due to not matching "
"'force_nodes' value of '%s'")
LOG.info(msg % forced_nodes_str)
def _get_hosts_matching_request(hosts, requested_destination):
(host, node) = (requested_destination.host,
requested_destination.node)
requested_nodes = [x for x in hosts
if x.host == host and x.nodename == node]
if requested_nodes:
LOG.info(_LI('Host filter only checking host %(host)s and '
'node %(node)s') % {'host': host, 'node': node})
else:
# NOTE(sbauza): The API level should prevent the user from
# providing a wrong destination but let's make sure a wrong
# destination doesn't trample the scheduler still.
LOG.info(_LI('No hosts matched due to not matching requested '
'destination (%(host)s, %(node)s)'
) % {'host': host, 'node': node})
return iter(requested_nodes)
ignore_hosts = spec_obj.ignore_hosts or []
force_hosts = spec_obj.force_hosts or []
force_nodes = spec_obj.force_nodes or []
requested_node = spec_obj.requested_destination
if requested_node is not None:
# NOTE(sbauza): Reduce a potentially long set of hosts as much as
# possible to any requested destination nodes before passing the
# list to the filters
hosts = _get_hosts_matching_request(hosts, requested_node)
if ignore_hosts or force_hosts or force_nodes:
# NOTE(deva): we can't assume "host" is unique because
# one host may have many nodes.
name_to_cls_map = {(x.host, x.nodename): x for x in hosts}
if ignore_hosts:
_strip_ignore_hosts(name_to_cls_map, ignore_hosts)
if not name_to_cls_map:
return []
# NOTE(deva): allow force_hosts and force_nodes independently
if force_hosts:
_match_forced_hosts(name_to_cls_map, force_hosts)
if force_nodes:
_match_forced_nodes(name_to_cls_map, force_nodes)
if force_hosts or force_nodes:
# NOTE(deva): Skip filters when forcing host or node
if name_to_cls_map:
return name_to_cls_map.values()
else:
return []
hosts = six.itervalues(name_to_cls_map)
return self.filter_handler.get_filtered_objects(self.default_filters,
hosts, spec_obj, index)
...scheduler/filters/__init.py HostFilterHandler繼承自filters.BaseFilterHandler基類。
class HostFilterHandler(filters.BaseFilterHandler): def __init__(self): super(HostFilterHandler, self).__init__(BaseHostFilter)
filters.py 遍歷每個過濾器并調用其filter_all方法進行所有節點過濾，最終調用過濾器基類的_filter_one方法進行單個節點過濾。
...
class BaseFilter(object):
"""Base class for all filter classes."""
def _filter_one(self, obj, spec_obj):
"""Return True if it passes the filter, False otherwise.
Override this in a subclass.
"""
return True
def filter_all(self, filter_obj_list, spec_obj):
"""Yield objects that pass the filter.
Can be overridden in a subclass, if you need to base filtering
decisions on all objects. Otherwise, one can just override
_filter_one() to filter a single object.
"""
for obj in filter_obj_list:
if self._filter_one(obj, spec_obj):
yield obj
# Set to true in a subclass if a filter only needs to be run once
# for each request rather than for each instance
run_filter_once_per_request = False
def run_filter_for_index(self, index):
"""Return True if the filter needs to be run for the "index-th"
instance in a request. Only need to override this if a filter
needs anything other than "first only" or "all" behaviour.
"""
if self.run_filter_once_per_request and index > 0:
return False
else:
return True
...
class BaseFilterHandler(loadables.BaseLoader):
"""Base class to handle loading filter classes.
This class should be subclassed where one needs to use filters.
"""
def get_filtered_objects(self, filters, objs, spec_obj, index=0):
list_objs = list(objs)
LOG.debug("Starting with %d host(s)", len(list_objs))
# Track the hosts as they are removed. The 'full_filter_results' list
# contains the host/nodename info for every host that passes each
# filter, while the 'part_filter_results' list just tracks the number
# removed by each filter, unless the filter returns zero hosts, in
# which case it records the host/nodename for the last batch that was
# removed. Since the full_filter_results can be very large, it is only
# recorded if the LOG level is set to debug.
part_filter_results = []
full_filter_results = []
log_msg = "%(cls_name)s: (start: %(start)s, end: %(end)s)"
for filter_ in filters:
if filter_.run_filter_for_index(index):
cls_name = filter_.__class__.__name__
start_count = len(list_objs)
objs = filter_.filter_all(list_objs, spec_obj)
if objs is None:
LOG.debug("Filter %s says to stop filtering", cls_name)
return
list_objs = list(objs)
end_count = len(list_objs)
part_filter_results.append(log_msg % {"cls_name": cls_name,
"start": start_count, "end": end_count})
if list_objs:
remaining = [(getattr(obj, "host", obj),
getattr(obj, "nodename", ""))
for obj in list_objs]
full_filter_results.append((cls_name, remaining))
else:
LOG.info(_LI("Filter %s returned 0 hosts"), cls_name)
full_filter_results.append((cls_name, None))
break
LOG.debug("Filter %(cls_name)s returned "
"%(obj_len)d host(s)",
{'cls_name': cls_name, 'obj_len': len(list_objs)})
if not list_objs:
# Log the filtration history
# NOTE(sbauza): Since the Cells scheduler still provides a legacy
# dictionary for filter_props, and since we agreed on not modifying
# the Cells scheduler to support that because of Cells v2, we
# prefer to define a compatible way to address both types
if isinstance(spec_obj, dict):
rspec = spec_obj.get("request_spec", {})
inst_props = rspec.get("instance_properties", {})
inst_uuid = inst_props.get("uuid", "")
else:
inst_uuid = spec_obj.instance_uuid
msg_dict = {"inst_uuid": inst_uuid,
"str_results": str(full_filter_results),
}
full_msg = ("Filtering removed all hosts for the request with "
"instance ID "
"'%(inst_uuid)s'. Filter results: %(str_results)s"
) % msg_dict
msg_dict["str_results"] = str(part_filter_results)
part_msg = _LI("Filtering removed all hosts for the request with "
"instance ID "
"'%(inst_uuid)s'. Filter results: %(str_results)s"
) % msg_dict
LOG.debug(full_msg)
LOG.info(part_msg)
return list_objsscheduler/host_manager.py 獲取所有過濾器列表。
... CONF = nova.conf.CONF ... class HostManager(object): ... def __init__(self): ... self.default_filters = self._choose_host_filters(self._load_filters()) ... def _load_filters(self): return CONF.scheduler_default_filters ... def _choose_host_filters(self, filter_cls_names): """Since the caller may specify which filters to use we need to have an authoritative list of what is permissible. This function checks the filter names against a predefined set of acceptable filters. """ if not isinstance(filter_cls_names, (list, tuple)): filter_cls_names = [filter_cls_names] good_filters = [] bad_filters = [] for filter_name in filter_cls_names: if filter_name not in self.filter_obj_map: if filter_name not in self.filter_cls_map: bad_filters.append(filter_name) continue filter_cls = self.filter_cls_map[filter_name] self.filter_obj_map[filter_name] = filter_cls() good_filters.append(self.filter_obj_map[filter_name]) if bad_filters: msg = ", ".join(bad_filters) raise exception.SchedulerHostFilterNotFound(filter_name=msg) return good_filters ...
conf/scheduler.py 默認的過濾器列表。
...
host_mgr_default_filt_opt = cfg.ListOpt("scheduler_default_filters",
default=[
"RetryFilter",
"AvailabilityZoneFilter",
"RamFilter",
"DiskFilter",
"ComputeFilter",
"ComputeCapabilitiesFilter",
"ImagePropertiesFilter",
"ServerGroupAntiAffinityFilter",
"ServerGroupAffinityFilter",
],
help="""
This option is the list of filter class names that will be used for filtering
hosts. The use of 'default' in the name of this option implies that other
filters may sometimes be used, but that is not the case. These filters will be
applied in the order they are listed, so place your most restrictive filters
first to make the filtering process more efficient.
This option is only used by the FilterScheduler and its subclasses; if you use
a different scheduler, this option has no effect.
* Related options:
All of the filters in this option *must* be present in the
'scheduler_available_filters' option, or a SchedulerHostFilterNotFound
exception will be raised.
""")
...scheduler/host_manager.py
... from nova.scheduler import weights ... class HostManager(object): ... def __init__(self): ... self.weight_handler = weights.HostWeightHandler() ... def get_weighed_hosts(self, hosts, spec_obj): """Weigh the hosts.""" return self.weight_handler.get_weighed_objects(self.weighers, hosts, spec_obj) ...
/nova/api/openstack/compute/servers.py:Controller create() - 處理用戶的http請求；
/nova/compute/api.py:API create()->_create_instance()->compute_task_api() - 處理虛擬機create方法；
/nova/conductor/init.py:ComputeTaskAPI build_instances() - 根據配置選擇本地還是遠程調用；
/nova/conductor/rpcapi.py:ComputeTaskAPI build_instances() - RPC調用nova-conductor的build_instances方法。
/nova/conductor/Manager.py:ComputeTaskManager build_instances() - RPC調用nova-scheduler服務進行節點選擇（self.scheduler_client.select_destinations()）；
/nova/compute/rpcapi.py:ComputeAPI build_and_run_instance() - RPC調用nova-compute服務創建并運行虛擬機。
/nova/scheduler/client/init.py:SchedulerClient select_destinations() - nova-scheduler節點選擇的RPC客戶端；
/nova/scheduler/manager.py:SchedulerManager select_destinations() - 使用調度器驅動進行節點選擇；
/nova/scheduler/filter_scheduler.py:FilterScheduler select_destinations() - 使用過濾器調度驅動進行節點選擇；
/nova/scheduler/filter_scheduler.py:FilterScheduler _schedule() - 進行節點過濾和稱重，選擇出合適的節點。
/nova/compute/manager.py:ComputeManager build_and_run_instance() 構建并運行虛擬機。
scheduler/host_manager.py
class HostState(object):
"""Mutable and immutable information tracked for a host.
This is an attempt to remove the ad-hoc data structures
previously used and lock down access.
"""
def __init__(self, host, node):
self.host = host
self.nodename = node
self._lock_name = (host, node)
# Mutable available resources.
# These will change as resources are virtually "consumed".
self.total_usable_ram_mb = 0
self.total_usable_disk_gb = 0
self.disk_mb_used = 0
self.free_ram_mb = 0
self.free_disk_mb = 0
self.vcpus_total = 0
self.vcpus_used = 0
self.pci_stats = None
self.numa_topology = None
# Additional host information from the compute node stats:
self.num_instances = 0
self.num_io_ops = 0
# Other information
self.host_ip = None
self.hypervisor_type = None
self.hypervisor_version = None
self.hypervisor_hostname = None
self.cpu_info = None
self.supported_instances = None
# Resource oversubscription values for the compute host:
self.limits = {}
# Generic metrics from compute nodes
self.metrics = None
# List of aggregates the host belongs to
self.aggregates = []
# Instances on this host
self.instances = {}
# Allocation ratios for this host
self.ram_allocation_ratio = None
self.cpu_allocation_ratio = None
self.disk_allocation_ratio = None
self.updated = None
def update(self, compute=None, service=None, aggregates=None,
inst_dict=None):
"""Update all information about a host."""
@utils.synchronized(self._lock_name)
def _locked_update(self, compute, service, aggregates, inst_dict):
# Scheduler API is inherently multi-threaded as every incoming RPC
# message will be dispatched in it's own green thread. So the
# shared host state should be updated in a consistent way to make
# sure its data is valid under concurrent write operations.
if compute is not None:
LOG.debug("Update host state from compute node: %s", compute)
self._update_from_compute_node(compute)
if aggregates is not None:
LOG.debug("Update host state with aggregates: %s", aggregates)
self.aggregates = aggregates
if service is not None:
LOG.debug("Update host state with service dict: %s", service)
self.service = ReadOnlyDict(service)
if inst_dict is not None:
LOG.debug("Update host state with instances: %s", inst_dict)
self.instances = inst_dict
return _locked_update(self, compute, service, aggregates, inst_dict)
def _update_from_compute_node(self, compute):
"""Update information about a host from a ComputeNode object."""
if (self.updated and compute.updated_at
and self.updated > compute.updated_at):
return
all_ram_mb = compute.memory_mb
# Assume virtual size is all consumed by instances if use qcow2 disk.
free_gb = compute.free_disk_gb
least_gb = compute.disk_available_least
if least_gb is not None:
if least_gb > free_gb:
# can occur when an instance in database is not on host
LOG.warning(_LW("Host %(hostname)s has more disk space than "
"database expected "
"(%(physical)s GB > %(database)s GB)"),
{'physical': least_gb, 'database': free_gb,
'hostname': compute.hypervisor_hostname})
free_gb = min(least_gb, free_gb)
free_disk_mb = free_gb * 1024
self.disk_mb_used = compute.local_gb_used * 1024
# NOTE(jogo) free_ram_mb can be negative
self.free_ram_mb = compute.free_ram_mb
self.total_usable_ram_mb = all_ram_mb
self.total_usable_disk_gb = compute.local_gb
self.free_disk_mb = free_disk_mb
self.vcpus_total = compute.vcpus
self.vcpus_used = compute.vcpus_used
self.updated = compute.updated_at
self.numa_topology = compute.numa_topology
self.pci_stats = pci_stats.PciDeviceStats(
compute.pci_device_pools)
# All virt drivers report host_ip
self.host_ip = compute.host_ip
self.hypervisor_type = compute.hypervisor_type
self.hypervisor_version = compute.hypervisor_version
self.hypervisor_hostname = compute.hypervisor_hostname
self.cpu_info = compute.cpu_info
if compute.supported_hv_specs:
self.supported_instances = [spec.to_list() for spec
in compute.supported_hv_specs]
else:
self.supported_instances = []
# Don't store stats directly in host_state to make sure these don't
# overwrite any values, or get overwritten themselves. Store in self so
# filters can schedule with them.
self.stats = compute.stats or {}
# Track number of instances on host
self.num_instances = int(self.stats.get('num_instances', 0))
self.num_io_ops = int(self.stats.get('io_workload', 0))
# update metrics
self.metrics = objects.MonitorMetricList.from_json(compute.metrics)
# update allocation ratios given by the ComputeNode object
self.cpu_allocation_ratio = compute.cpu_allocation_ratio
self.ram_allocation_ratio = compute.ram_allocation_ratio
self.disk_allocation_ratio = compute.disk_allocation_ratio
def consume_from_request(self, spec_obj):
"""Incrementally update host state from a RequestSpec object."""
@utils.synchronized(self._lock_name)
@set_update_time_on_success
def _locked(self, spec_obj):
# Scheduler API is inherently multi-threaded as every incoming RPC
# message will be dispatched in it's own green thread. So the
# shared host state should be consumed in a consistent way to make
# sure its data is valid under concurrent write operations.
self._locked_consume_from_request(spec_obj)
return _locked(self, spec_obj)
def _locked_consume_from_request(self, spec_obj):
disk_mb = (spec_obj.root_gb +
spec_obj.ephemeral_gb) * 1024
ram_mb = spec_obj.memory_mb
vcpus = spec_obj.vcpus
self.free_ram_mb -= ram_mb
self.free_disk_mb -= disk_mb
self.vcpus_used += vcpus
# Track number of instances on host
self.num_instances += 1
pci_requests = spec_obj.pci_requests
if pci_requests and self.pci_stats:
pci_requests = pci_requests.requests
else:
pci_requests = None
# Calculate the numa usage
host_numa_topology, _fmt = hardware.host_topology_and_format_from_host(
self)
instance_numa_topology = spec_obj.numa_topology
spec_obj.numa_topology = hardware.numa_fit_instance_to_host(
host_numa_topology, instance_numa_topology,
limits=self.limits.get('numa_topology'),
pci_requests=pci_requests, pci_stats=self.pci_stats)
if pci_requests:
instance_cells = None
if spec_obj.numa_topology:
instance_cells = spec_obj.numa_topology.cells
self.pci_stats.apply_requests(pci_requests, instance_cells)
# NOTE(sbauza): Yeah, that's crap. We should get rid of all of those
# NUMA helpers because now we're 100% sure that spec_obj.numa_topology
# is an InstanceNUMATopology object. Unfortunately, since
# HostState.host_numa_topology is still limbo between an NUMATopology
# object (when updated by consume_from_request), a ComputeNode object
# (when updated by update_from_compute_node), we need to keep the call
# to get_host_numa_usage_from_instance until it's fixed (and use a
# temporary orphaned Instance object as a proxy)
instance = objects.Instance(numa_topology=spec_obj.numa_topology)
self.numa_topology = hardware.get_host_numa_usage_from_instance(
self, instance)
# NOTE(sbauza): By considering all cases when the scheduler is called
# and when consume_from_request() is run, we can safely say that there
# is always an IO operation because we want to move the instance
self.num_io_ops += 1
def __repr__(self):
return ("(%(host)s, %(node)s) ram: %(free_ram)sMB "
"disk: %(free_disk)sMB io_ops: %(num_io_ops)s "
"instances: %(num_instances)s" %
{'host': self.host, 'node': self.nodename,
'free_ram': self.free_ram_mb, 'free_disk': self.free_disk_mb,
'num_io_ops': self.num_io_ops,
'num_instances': self.num_instances})這是在compute/api.py源碼中的參數構建，還有一部分在conductor/manager.py的build_instances方法中。
...
class API(base.Base):
"""API for interacting with the compute manager."""
...
def _create_instance(self, context, instance_type,
image_href, kernel_id, ramdisk_id,
min_count, max_count,
display_name, display_description,
key_name, key_data, security_groups,
availability_zone, user_data, metadata, injected_files,
admin_password, access_ip_v4, access_ip_v6,
requested_networks, config_drive,
block_device_mapping, auto_disk_config, filter_properties,
reservation_id=None, legacy_bdm=True, shutdown_terminate=False,
check_server_group_quota=False):
"""Verify all the input parameters regardless of the provisioning
strategy being performed and schedule the instance(s) for
creation.
"""
# Normalize and setup some parameters
if reservation_id is None:
reservation_id = utils.generate_uid('r')
security_groups = security_groups or ['default']
min_count = min_count or 1
max_count = max_count or min_count
block_device_mapping = block_device_mapping or []
if image_href:
image_id, boot_meta = self._get_image(context, image_href)
else:
image_id = None
boot_meta = self._get_bdm_image_metadata(
context, block_device_mapping, legacy_bdm)
self._check_auto_disk_config(image=boot_meta,
auto_disk_config=auto_disk_config)
base_options, max_net_count, key_pair = \
self._validate_and_build_base_options(
context, instance_type, boot_meta, image_href, image_id,
kernel_id, ramdisk_id, display_name, display_description,
key_name, key_data, security_groups, availability_zone,
user_data, metadata, access_ip_v4, access_ip_v6,
requested_networks, config_drive, auto_disk_config,
reservation_id, max_count)
# max_net_count is the maximum number of instances requested by the
# user adjusted for any network quota constraints, including
# consideration of connections to each requested network
if max_net_count < min_count:
raise exception.PortLimitExceeded()
elif max_net_count < max_count:
LOG.info(_LI("max count reduced from %(max_count)d to "
"%(max_net_count)d due to network port quota"),
{'max_count': max_count,
'max_net_count': max_net_count})
max_count = max_net_count
block_device_mapping = self._check_and_transform_bdm(context,
base_options, instance_type, boot_meta, min_count, max_count,
block_device_mapping, legacy_bdm)
# We can't do this check earlier because we need bdms from all sources
# to have been merged in order to get the root bdm.
self._checks_for_create_and_rebuild(context, image_id, boot_meta,
instance_type, metadata, injected_files,
block_device_mapping.root_bdm())
instance_group = self._get_requested_instance_group(context,
filter_properties)
instances = self._provision_instances(context, instance_type,
min_count, max_count, base_options, boot_meta, security_groups,
block_device_mapping, shutdown_terminate,
instance_group, check_server_group_quota, filter_properties,
key_pair)
for instance in instances:
self._record_action_start(context, instance,
instance_actions.CREATE)
self.compute_task_api.build_instances(context,
instances=instances, image=boot_meta,
filter_properties=filter_properties,
admin_password=admin_password,
injected_files=injected_files,
requested_networks=requested_networks,
security_groups=security_groups,
block_device_mapping=block_device_mapping,
legacy_bdm=False)
return (instances, reservation_id)
...（compute/api.py）
...
def _validate_and_build_base_options(self, context, instance_type,
boot_meta, image_href, image_id,
kernel_id, ramdisk_id, display_name,
display_description, key_name,
key_data, security_groups,
availability_zone, user_data,
metadata, access_ip_v4, access_ip_v6,
requested_networks, config_drive,
auto_disk_config, reservation_id,
max_count):
"""Verify all the input parameters regardless of the provisioning
strategy being performed.
"""
if instance_type['disabled']:
raise exception.FlavorNotFound(flavor_id=instance_type['id'])
if user_data:
l = len(user_data)
if l > MAX_USERDATA_SIZE:
# NOTE(mikal): user_data is stored in a text column, and
# the database might silently truncate if its over length.
raise exception.InstanceUserDataTooLarge(
length=l, maxsize=MAX_USERDATA_SIZE)
try:
base64.decodestring(user_data)
except base64.binascii.Error:
raise exception.InstanceUserDataMalformed()
self._check_requested_secgroups(context, security_groups)
# Note: max_count is the number of instances requested by the user,
# max_network_count is the maximum number of instances taking into
# account any network quotas
max_network_count = self._check_requested_networks(context,
requested_networks, max_count)
kernel_id, ramdisk_id = self._handle_kernel_and_ramdisk(
context, kernel_id, ramdisk_id, boot_meta)
config_drive = self._check_config_drive(config_drive)
if key_data is None and key_name is not None:
key_pair = objects.KeyPair.get_by_name(context,
context.user_id,
key_name)
key_data = key_pair.public_key
else:
key_pair = None
root_device_name = block_device.prepend_dev(
block_device.properties_root_device_name(
boot_meta.get('properties', {})))
try:
image_meta = objects.ImageMeta.from_dict(boot_meta)
except ValueError as e:
# there must be invalid values in the image meta properties so
# consider this an invalid request
msg = _('Invalid image metadata. Error: %s') % six.text_type(e)
raise exception.InvalidRequest(msg)
numa_topology = hardware.numa_get_constraints(
instance_type, image_meta)
system_metadata = {}
# PCI requests come from two sources: instance flavor and
# requested_networks. The first call in below returns an
# InstancePCIRequests object which is a list of InstancePCIRequest
# objects. The second call in below creates an InstancePCIRequest
# object for each SR-IOV port, and append it to the list in the
# InstancePCIRequests object
pci_request_info = pci_request.get_pci_requests_from_flavor(
instance_type)
self.network_api.create_pci_requests_for_sriov_ports(context,
pci_request_info, requested_networks)
base_options = {
'reservation_id': reservation_id,
'image_ref': image_href,
'kernel_id': kernel_id or '',
'ramdisk_id': ramdisk_id or '',
'power_state': power_state.NOSTATE,
'vm_state': vm_states.BUILDING,
'config_drive': config_drive,
'user_id': context.user_id,
'project_id': context.project_id,
'instance_type_id': instance_type['id'],
'memory_mb': instance_type['memory_mb'],
'vcpus': instance_type['vcpus'],
'root_gb': instance_type['root_gb'],
'ephemeral_gb': instance_type['ephemeral_gb'],
'display_name': display_name,
'display_description': display_description,
'user_data': user_data,
'key_name': key_name,
'key_data': key_data,
'locked': False,
'metadata': metadata or {},
'access_ip_v4': access_ip_v4,
'access_ip_v6': access_ip_v6,
'availability_zone': availability_zone,
'root_device_name': root_device_name,
'progress': 0,
'pci_requests': pci_request_info,
'numa_topology': numa_topology,
'system_metadata': system_metadata}
options_from_image = self._inherit_properties_from_image(
boot_meta, auto_disk_config)
base_options.update(options_from_image)
# return the validated options and maximum number of instances allowed
# by the network quotas
return base_options, max_network_count, key_pair
...（compute/api.py）
...
def _provision_instances(self, context, instance_type, min_count,
max_count, base_options, boot_meta, security_groups,
block_device_mapping, shutdown_terminate,
instance_group, check_server_group_quota, filter_properties,
key_pair):
# Reserve quotas
num_instances, quotas = self._check_num_instances_quota(
context, instance_type, min_count, max_count)
security_groups = self.security_group_api.populate_security_groups(
security_groups)
self.security_group_api.ensure_default(context)
LOG.debug("Going to run %s instances...", num_instances)
instances = []
instance_mappings = []
build_requests = []
try:
for i in range(num_instances):
# Create a uuid for the instance so we can store the
# RequestSpec before the instance is created.
instance_uuid = str(uuid.uuid4())
# Store the RequestSpec that will be used for scheduling.
req_spec = objects.RequestSpec.from_components(context,
instance_uuid, boot_meta, instance_type,
base_options['numa_topology'],
base_options['pci_requests'], filter_properties,
instance_group, base_options['availability_zone'])
req_spec.create()
# Create an instance object, but do not store in db yet.
instance = objects.Instance(context=context)
instance.uuid = instance_uuid
instance.update(base_options)
instance.keypairs = objects.KeyPairList(objects=[])
if key_pair:
instance.keypairs.objects.append(key_pair)
instance = self.create_db_entry_for_new_instance(context,
instance_type, boot_meta, instance, security_groups,
block_device_mapping, num_instances, i,
shutdown_terminate, create_instance=False)
block_device_mapping = (
self._bdm_validate_set_size_and_instance(context,
instance, instance_type, block_device_mapping))
build_request = objects.BuildRequest(context,
instance=instance, instance_uuid=instance.uuid,
project_id=instance.project_id,
block_device_mappings=block_device_mapping)
build_request.create()
build_requests.append(build_request)
# Create an instance_mapping. The null cell_mapping indicates
# that the instance doesn't yet exist in a cell, and lookups
# for it need to instead look for the RequestSpec.
# cell_mapping will be populated after scheduling, with a
# scheduling failure using the cell_mapping for the special
# cell0.
inst_mapping = objects.InstanceMapping(context=context)
inst_mapping.instance_uuid = instance_uuid
inst_mapping.project_id = context.project_id
inst_mapping.cell_mapping = None
inst_mapping.create()
instance_mappings.append(inst_mapping)
# TODO(alaski): Cast to conductor here which will call the
# scheduler and defer instance creation until the scheduler
# has picked a cell/host. Set the instance_mapping to the cell
# that the instance is scheduled to.
# NOTE(alaski): Instance and block device creation are going
# to move to the conductor.
instance.create()
instances.append(instance)
self._create_block_device_mapping(block_device_mapping)
if instance_group:
if check_server_group_quota:
count = objects.Quotas.count(context,
'server_group_members',
instance_group,
context.user_id)
try:
objects.Quotas.limit_check(context,
server_group_members=count + 1)
except exception.OverQuota:
msg = _("Quota exceeded, too many servers in "
"group")
raise exception.QuotaError(msg)
objects.InstanceGroup.add_members(context,
instance_group.uuid,
[instance.uuid])
# send a state update notification for the initial create to
# show it going from non-existent to BUILDING
notifications.send_update_with_states(context, instance, None,
vm_states.BUILDING, None, None, service="api")
# In the case of any exceptions, attempt DB cleanup and rollback the
# quota reservations.
except Exception:
with excutils.save_and_reraise_exception():
try:
for instance in instances:
try:
instance.destroy()
except exception.ObjectActionError:
pass
for instance_mapping in instance_mappings:
try:
instance_mapping.destroy()
except exception.InstanceMappingNotFound:
pass
for build_request in build_requests:
try:
build_request.destroy()
except exception.BuildRequestNotFound:
pass
finally:
quotas.rollback()
# Commit the reservations
quotas.commit()
return instances
...（compute/api.py）
...
def _get_bdm_image_metadata(self, context, block_device_mapping,
legacy_bdm=True):
"""If we are booting from a volume, we need to get the
volume details from Cinder and make sure we pass the
metadata back accordingly.
"""
if not block_device_mapping:
return {}
for bdm in block_device_mapping:
if (legacy_bdm and
block_device.get_device_letter(
bdm.get('device_name', '')) != 'a'):
continue
elif not legacy_bdm and bdm.get('boot_index') != 0:
continue
volume_id = bdm.get('volume_id')
snapshot_id = bdm.get('snapshot_id')
if snapshot_id:
# NOTE(alaski): A volume snapshot inherits metadata from the
# originating volume, but the API does not expose metadata
# on the snapshot itself. So we query the volume for it below.
snapshot = self.volume_api.get_snapshot(context, snapshot_id)
volume_id = snapshot['volume_id']
if bdm.get('image_id'):
try:
image_id = bdm['image_id']
image_meta = self.image_api.get(context, image_id)
return image_meta
except Exception:
raise exception.InvalidBDMImage(id=image_id)
elif volume_id:
try:
volume = self.volume_api.get(context, volume_id)
except exception.CinderConnectionFailed:
raise
except Exception:
raise exception.InvalidBDMVolume(id=volume_id)
if not volume.get('bootable', True):
raise exception.InvalidBDMVolumeNotBootable(id=volume_id)
return utils.get_image_metadata_from_volume(volume)
return {}
...由conductor.manager.ComputeTaskManager.build_instances方法調用（scheduler/utils.py ）。
...
def build_request_spec(ctxt, image, instances, instance_type=None):
"""Build a request_spec for the scheduler.
The request_spec assumes that all instances to be scheduled are the same
type.
"""
instance = instances[0]
if instance_type is None:
if isinstance(instance, obj_instance.Instance):
instance_type = instance.get_flavor()
else:
instance_type = flavors.extract_flavor(instance)
if isinstance(instance, obj_instance.Instance):
instance = obj_base.obj_to_primitive(instance)
# obj_to_primitive doesn't copy this enough, so be sure
# to detach our metadata blob because we modify it below.
instance['system_metadata'] = dict(instance.get('system_metadata', {}))
if isinstance(instance_type, objects.Flavor):
instance_type = obj_base.obj_to_primitive(instance_type)
# NOTE(danms): Replicate this old behavior because the
# scheduler RPC interface technically expects it to be
# there. Remove this when we bump the scheduler RPC API to
# v5.0
try:
flavors.save_flavor_info(instance.get('system_metadata', {}),
instance_type)
except KeyError:
# If the flavor isn't complete (which is legit with a
# flavor object, just don't put it in the request spec
pass
request_spec = {
'image': image or {},
'instance_properties': instance,
'instance_type': instance_type,
'num_instances': len(instances)}
return jsonutils.to_primitive(request_spec)
...在響應RPC調用時，ComputeTaskManager（conductor/manager.py）的_schedule_instances方法和SchedulerManager（scheduler/manager.py）的select_destinations方法都會使用objects.RequestSpec.from_primitives（objects/request_spec.py）方法生成一個新風格的RequestSpec。
objects/request_spec.py 生成一個新風格的RequestSpec
...
from nova.objects import instance as obj_instance
...
@base.NovaObjectRegistry.register
class RequestSpec(base.NovaObject):
...
@classmethod
def from_primitives(cls, context, request_spec, filter_properties):
"""Returns a new RequestSpec object by hydrating it from legacy dicts.
Deprecated. A RequestSpec object is created early in the boot process
using the from_components method. That object will either be passed to
places that require it, or it can be looked up with
get_by_instance_uuid. This method can be removed when there are no
longer any callers. Because the method is not remotable it is not tied
to object versioning.
That helper is not intended to leave the legacy dicts kept in the nova
codebase, but is rather just for giving a temporary solution for
populating the Spec object until we get rid of scheduler_utils'
build_request_spec() and the filter_properties hydratation in the
conductor.
:param context: a context object
:param request_spec: An old-style request_spec dictionary
:param filter_properties: An old-style filter_properties dictionary
"""
num_instances = request_spec.get('num_instances', 1)
spec = cls(context, num_instances=num_instances)
# Hydrate from request_spec first
image = request_spec.get('image')
spec._image_meta_from_image(image)
instance = request_spec.get('instance_properties')
spec._from_instance(instance)
flavor = request_spec.get('instance_type')
spec._from_flavor(flavor)
# Hydrate now from filter_properties
spec.ignore_hosts = filter_properties.get('ignore_hosts')
spec.force_hosts = filter_properties.get('force_hosts')
spec.force_nodes = filter_properties.get('force_nodes')
retry = filter_properties.get('retry', {})
spec._from_retry(retry)
limits = filter_properties.get('limits', {})
spec._from_limits(limits)
spec._populate_group_info(filter_properties)
scheduler_hints = filter_properties.get('scheduler_hints', {})
spec._from_hints(scheduler_hints)
# NOTE(sbauza): Default the other fields that are not part of the
# original contract
spec.obj_set_defaults()
return spec
...
def _image_meta_from_image(self, image):
if isinstance(image, objects.ImageMeta):
self.image = image
elif isinstance(image, dict):
# NOTE(sbauza): Until Nova is fully providing an ImageMeta object
# for getting properties, we still need to hydrate it here
# TODO(sbauza): To be removed once all RequestSpec hydrations are
# done on the conductor side and if the image is an ImageMeta
self.image = objects.ImageMeta.from_dict(image)
else:
self.image = None
...
def _from_instance(self, instance):
if isinstance(instance, obj_instance.Instance):
# NOTE(sbauza): Instance should normally be a NovaObject...
getter = getattr
elif isinstance(instance, dict):
# NOTE(sbauza): ... but there are some cases where request_spec
# has an instance key as a dictionary, just because
# select_destinations() is getting a request_spec dict made by
# sched_utils.build_request_spec()
# TODO(sbauza): To be removed once all RequestSpec hydrations are
# done on the conductor side
getter = lambda x, y: x.get(y)
else:
# If the instance is None, there is no reason to set the fields
return
instance_fields = ['numa_topology', 'pci_requests', 'uuid',
'project_id', 'availability_zone']
for field in instance_fields:
if field == 'uuid':
setattr(self, 'instance_uuid', getter(instance, field))
elif field == 'pci_requests':
self._from_instance_pci_requests(getter(instance, field))
elif field == 'numa_topology':
self._from_instance_numa_topology(getter(instance, field))
else:
setattr(self, field, getter(instance, field))
...
def _from_flavor(self, flavor):
if isinstance(flavor, objects.Flavor):
self.flavor = flavor
elif isinstance(flavor, dict):
# NOTE(sbauza): Again, request_spec is primitived by
# sched_utils.build_request_spec() and passed to
# select_destinations() like this
# TODO(sbauza): To be removed once all RequestSpec hydrations are
# done on the conductor side
self.flavor = objects.Flavor(**flavor)
...
def _from_retry(self, retry_dict):
self.retry = (SchedulerRetries.from_dict(self._context, retry_dict)
if retry_dict else None)
...
def _from_limits(self, limits_dict):
self.limits = SchedulerLimits.from_dict(limits_dict)
...
def _from_hints(self, hints_dict):
if hints_dict is None:
self.scheduler_hints = None
return
self.scheduler_hints = {
hint: value if isinstance(value, list) else [value]
for hint, value in six.iteritems(hints_dict)}
...
class SchedulerRetries(base.NovaObject):
# Version 1.0: Initial version
# Version 1.1: ComputeNodeList version 1.14
VERSION = '1.1'
fields = {
'num_attempts': fields.IntegerField(),
# NOTE(sbauza): Even if we are only using host/node strings, we need to
# know which compute nodes were tried
'hosts': fields.ObjectField('ComputeNodeList'),
}
...
class SchedulerLimits(base.NovaObject):
# Version 1.0: Initial version
VERSION = '1.0'
fields = {
'numa_topology': fields.ObjectField('NUMATopologyLimits',
nullable=True,
default=None),
'vcpu': fields.IntegerField(nullable=True, default=None),
'disk_gb': fields.IntegerField(nullable=True, default=None),
'memory_mb': fields.IntegerField(nullable=True, default=None),
}
...objects/image_meta.py 鏡像規格
...
class ImageMeta(base.NovaObject):
...
fields = {
'id': fields.UUIDField(),
'name': fields.StringField(),
'status': fields.StringField(),
'visibility': fields.StringField(),
'protected': fields.FlexibleBooleanField(),
'checksum': fields.StringField(),
'owner': fields.StringField(),
'size': fields.IntegerField(),
'virtual_size': fields.IntegerField(),
'container_format': fields.StringField(),
'disk_format': fields.StringField(),
'created_at': fields.DateTimeField(nullable=True),
'updated_at': fields.DateTimeField(nullable=True),
'tags': fields.ListOfStringsField(),
'direct_url': fields.StringField(),
'min_ram': fields.IntegerField(),
'min_disk': fields.IntegerField(),
'properties': fields.ObjectField('ImageMetaProps'),
}
...objects/instance.py 實例規格
...
class Instance(base.NovaPersistentObject, base.NovaObject,
base.NovaObjectDictCompat):
...
fields = {
'id': fields.IntegerField(),
'user_id': fields.StringField(nullable=True),
'project_id': fields.StringField(nullable=True),
'image_ref': fields.StringField(nullable=True),
'kernel_id': fields.StringField(nullable=True),
'ramdisk_id': fields.StringField(nullable=True),
'hostname': fields.StringField(nullable=True),
'launch_index': fields.IntegerField(nullable=True),
'key_name': fields.StringField(nullable=True),
'key_data': fields.StringField(nullable=True),
'power_state': fields.IntegerField(nullable=True),
'vm_state': fields.StringField(nullable=True),
'task_state': fields.StringField(nullable=True),
'services': fields.ObjectField('ServiceList'),
'memory_mb': fields.IntegerField(nullable=True),
'vcpus': fields.IntegerField(nullable=True),
'root_gb': fields.IntegerField(nullable=True),
'ephemeral_gb': fields.IntegerField(nullable=True),
'ephemeral_key_uuid': fields.UUIDField(nullable=True),
'host': fields.StringField(nullable=True),
'node': fields.StringField(nullable=True),
'instance_type_id': fields.IntegerField(nullable=True),
'user_data': fields.StringField(nullable=True),
'reservation_id': fields.StringField(nullable=True),
'launched_at': fields.DateTimeField(nullable=True),
'terminated_at': fields.DateTimeField(nullable=True),
'availability_zone': fields.StringField(nullable=True),
'display_name': fields.StringField(nullable=True),
'display_description': fields.StringField(nullable=True),
'launched_on': fields.StringField(nullable=True),
# NOTE(jdillaman): locked deprecated in favor of locked_by,
# to be removed in Icehouse
'locked': fields.BooleanField(default=False),
'locked_by': fields.StringField(nullable=True),
'os_type': fields.StringField(nullable=True),
'architecture': fields.StringField(nullable=True),
'vm_mode': fields.StringField(nullable=True),
'uuid': fields.UUIDField(),
'root_device_name': fields.StringField(nullable=True),
'default_ephemeral_device': fields.StringField(nullable=True),
'default_swap_device': fields.StringField(nullable=True),
'config_drive': fields.StringField(nullable=True),
'access_ip_v4': fields.IPV4AddressField(nullable=True),
'access_ip_v6': fields.IPV6AddressField(nullable=True),
'auto_disk_config': fields.BooleanField(default=False),
'progress': fields.IntegerField(nullable=True),
'shutdown_terminate': fields.BooleanField(default=False),
'disable_terminate': fields.BooleanField(default=False),
'cell_name': fields.StringField(nullable=True),
'metadata': fields.DictOfStringsField(),
'system_metadata': fields.DictOfNullableStringsField(),
'info_cache': fields.ObjectField('InstanceInfoCache',
nullable=True),
'security_groups': fields.ObjectField('SecurityGroupList'),
'fault': fields.ObjectField('InstanceFault', nullable=True),
'cleaned': fields.BooleanField(default=False),
'pci_devices': fields.ObjectField('PciDeviceList', nullable=True),
'numa_topology': fields.ObjectField('InstanceNUMATopology',
nullable=True),
'pci_requests': fields.ObjectField('InstancePCIRequests',
nullable=True),
'device_metadata': fields.ObjectField('InstanceDeviceMetadata',
nullable=True),
'tags': fields.ObjectField('TagList'),
'flavor': fields.ObjectField('Flavor'),
'old_flavor': fields.ObjectField('Flavor', nullable=True),
'new_flavor': fields.ObjectField('Flavor', nullable=True),
'vcpu_model': fields.ObjectField('VirtCPUModel', nullable=True),
'ec2_ids': fields.ObjectField('EC2Ids'),
'migration_context': fields.ObjectField('MigrationContext',
nullable=True),
'keypairs': fields.ObjectField('KeyPairList'),
}
...objects/flavor.py 模板規格
...
class Flavor(base.NovaPersistentObject, base.NovaObject,
base.NovaObjectDictCompat):
...
fields = {
'id': fields.IntegerField(),
'name': fields.StringField(nullable=True),
'memory_mb': fields.IntegerField(),
'vcpus': fields.IntegerField(),
'root_gb': fields.IntegerField(),
'ephemeral_gb': fields.IntegerField(),
'flavorid': fields.StringField(),
'swap': fields.IntegerField(),
'rxtx_factor': fields.FloatField(nullable=True, default=1.0),
'vcpu_weight': fields.IntegerField(nullable=True),
'disabled': fields.BooleanField(),
'is_public': fields.BooleanField(),
'extra_specs': fields.DictOfStringsField(),
'projects': fields.ListOfStringsField(),
}
...filters.py BaseFilter為供外部調用的基類。
class BaseFilter(object): """Base class for all filter classes.""" def _filter_one(self, obj, spec_obj): """Return True if it passes the filter, False otherwise. Override this in a subclass. """ return True def filter_all(self, filter_obj_list, spec_obj): """Yield objects that pass the filter. Can be overridden in a subclass, if you need to base filtering decisions on all objects. Otherwise, one can just override _filter_one() to filter a single object. """ for obj in filter_obj_list: if self._filter_one(obj, spec_obj): yield obj # Set to true in a subclass if a filter only needs to be run once # for each request rather than for each instance run_filter_once_per_request = False def run_filter_for_index(self, index): """Return True if the filter needs to be run for the "index-th" instance in a request. Only need to override this if a filter needs anything other than "first only" or "all" behaviour. """ if self.run_filter_once_per_request and index > 0: return False else: return True
scheduler/filters/init.py BaseHostFilter是過濾器需要派生的基類，重載了_filter_one方法，所有的子類都需要重載host_passes方法來判斷節點是否通過過濾。
class BaseHostFilter(filters.BaseFilter): """Base class for host filters.""" def _filter_one(self, obj, filter_properties): """Return True if the object passes the filter, otherwise False.""" return self.host_passes(obj, filter_properties) def host_passes(self, host_state, filter_properties): """Return True if the HostState passes the filter, otherwise False. Override this in a subclass. """ raise NotImplementedError()
這個過濾器只是簡單的打印參數和狀態信息，以及請求規格到日志。
編寫過濾器dump_filter：
$ vi /usr/lib/python2.7/dist-packages/nova/scheduler/filters/dump_filter.py
from oslo_log import log as logging
from nova.i18n import _LI
from nova.scheduler import filters
LOG = logging.getLogger(__name__)
class DumpFilter(filters.BaseHostFilter):
def host_passes(self, host_state, spec_obj):
LOG.info(_LI("------ Dump Filter ------"))
LOG.info(_LI(" ** Host Status **"))
LOG.info(_LI("host %s"), host_state.host)
LOG.info(_LI("nodename %s"), host_state.nodename)
LOG.info(_LI("total_usable_ram_mb %s"), host_state.total_usable_ram_mb)
LOG.info(_LI("total_usable_disk_gb %s"), host_state.total_usable_disk_gb)
LOG.info(_LI("disk_mb_used %s"), host_state.disk_mb_used)
LOG.info(_LI("free_ram_mb %s"), host_state.free_ram_mb)
LOG.info(_LI("free_disk_mb %s"), host_state.free_disk_mb)
LOG.info(_LI("vcpus_total %s"), host_state.vcpus_total)
LOG.info(_LI("vcpus_used %s"), host_state.vcpus_used)
LOG.info(_LI("pci_stats %s"), host_state.pci_stats)
LOG.info(_LI("numa_topology %s"), host_state.numa_topology)
LOG.info(_LI("num_instances %s"), host_state.num_instances)
LOG.info(_LI("num_io_ops %s"), host_state.num_io_ops)
LOG.info(_LI("host_ip %s"), host_state.host_ip)
LOG.info(_LI("hypervisor_type %s"), host_state.hypervisor_type)
LOG.info(_LI("hypervisor_version %s"), host_state.hypervisor_version)
LOG.info(_LI("hypervisor_hostname %s"), host_state.hypervisor_hostname)
LOG.info(_LI("cpu_info %s"), host_state.cpu_info)
LOG.info(_LI("supported_instances %s"), host_state.supported_instances)
LOG.info(_LI("limits %s"), host_state.limits)
LOG.info(_LI("metrics %s"), host_state.metrics)
LOG.info(_LI("aggregates %s"), host_state.aggregates)
LOG.info(_LI("instances %s"), host_state.instances)
LOG.info(_LI("ram_allocation_ratio %s"), host_state.ram_allocation_ratio)
LOG.info(_LI("cpu_allocation_ratio %s"), host_state.cpu_allocation_ratio)
LOG.info(_LI("disk_allocation_ratio %s"), host_state.disk_allocation_ratio)
LOG.info(_LI("updated %s"), host_state.updated)
LOG.info(_LI(" ** Request Spect **"))
LOG.info(_LI("memory_mb %s"), spec_obj.memory_mb)
LOG.info(_LI("vcpus %s"), spec_obj.vcpus)
return True生成pyc文件：
$ python
Python 2.7.12 (default, Dec 4 2017, 14:50:18)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import py_compile
>>> py_compile.compile("/usr/lib/python2.7/dist-packages/nova/scheduler/filters/dump_filter.py")修改默認過濾器列表和日志等級：
$ vi /etc/nova/logging.conf [DEFAULT] ... scheduler_default_filters = RetryFilter, DumpFilter, AvailabilityZoneFilter, RamFilter, DiskFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter, ServerGroupAntiAffinityFilter, ServerGroupAffinityFilter ... [logger_root] level = DEBUG handlers = null [logger_nova] level = DEBUG handlers = stderr qualname = nova ...
停止原有nova-scheduler后臺系統服務，并在控制臺手動啟動nova-scheduler服務：
$ systemctl stop nova-scheduler $ /usr/bin/python /usr/bin/nova-scheduler --config-file=/etc/nova/nova.conf
創建、刪除一個虛擬機：
$ . demo-openrc $ openstack server create --flavor m1.nano --image cirros \ --nic net-id=eb2f08c3-dbc4-423e-8206-6b0fb07d94b7 \ --security-group default --key-name mykey test1 $ openstack server delete test1
查看nova-scheduler服務輸出：
...
2017-12-14 10:43:15.670 77206 WARNING oslo_reports.guru_meditation_report [-] Guru meditation now registers SIGUSR1 and SIGUSR2 by default for backward compatibility. SIGUSR1 will no longer be registered in a future release, so please use SIGUSR2 to generate reports.
2017-12-14 10:43:16.265 77206 INFO nova.service [-] Starting scheduler node (version 14.0.1)
2017-12-14 10:43:24.264 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
------ Dump Filter ------
2017-12-14 10:43:24.265 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
** Host Status **
2017-12-14 10:43:24.266 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
host UbuntuStack
2017-12-14 10:43:24.266 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
nodename ubuntustack
2017-12-14 10:43:24.267 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -] total_usable_ram_mb 3934
2017-12-14 10:43:24.267 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -] total_usable_disk_gb 18
2017-12-14 10:43:24.268 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
disk_mb_used 2048
2017-12-14 10:43:24.273 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
free_ram_mb 3294
2017-12-14 10:43:24.274 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
free_disk_mb 7168
2017-12-14 10:43:24.274 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
vcpus_total 2
2017-12-14 10:43:24.275 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
vcpus_used 2
2017-12-14 10:43:24.275 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
pci_stats <nova.pci.stats.PciDeviceStats object at 0x7f0cd5da9b50>
2017-12-14 10:43:24.276 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
numa_topology
{"nova_object.version": "1.2", "nova_object.changes": ["cells"], "nova_object.name": "NUMATopology", "nova_object.data": {"cells": [{"nova_object.version": "1.2", "nova_object.changes": ["cpu_usage", "memory_usage", "cpuset", "pinned_cpus", "siblings", "memory", "mempages", "id"], "nova_object.name": "NUMACell", "nova_object.data": {"cpu_usage": 0, "memory_usage": 0, "cpuset": [0, 1], "pinned_cpus": [], "siblings": [], "memory": 3934, "mempages": [{"nova_object.version": "1.1", "nova_object.changes": ["total", "reserved", "size_kb", "used"], "nova_object.name": "NUMAPagesTopology", "nova_object.data": {"used": 0, "total": 1007177, "reserved": 0, "size_kb": 4}, "nova_object.namespace": "nova"}, {"nova_object.version": "1.1", "nova_object.changes": ["total", "reserved", "size_kb", "used"], "nova_object.name": "NUMAPagesTopology", "nova_object.data": {"used": 0, "total": 0, "reserved": 0, "size_kb": 2048}, "nova_object.namespace": "nova"}, {"nova_object.version": "1.1", "nova_object.changes": ["total", "reserved", "size_kb", "used"], "nova_object.name": "NUMAPagesTopology", "nova_object.data": {"used": 0, "total": 0, "reserved": 0, "size_kb": 1048576}, "nova_object.namespace": "nova"}], "id": 0}, "nova_object.namespace": "nova"}]}, "nova_object.namespace": "nova"}
2017-12-14 10:43:24.281 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
num_instances 2
2017-12-14 10:43:24.281 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
num_io_ops 0
2017-12-14 10:43:24.282 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
host_ip 192.168.195.160
2017-12-14 10:43:24.283 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
hypervisor_type QEMU
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hypervisor_version 2005000
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hypervisor_hostname ubuntustack
2017-12-14 10:43:24.284 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
cpu_info {"vendor": "Intel", "model": "Broadwell-noTSX", "arch": "x86_64", "features": ["smap", "avx", "clflush", "sep", "syscall", "vme", "invpcid", "tsc", "fsgsbase", "xsave", "pge", "erms", "cmov", "smep", "pcid", "pat", "lm", "msr", "adx", "3dnowprefetch", "nx", "fxsr", "sse4.1", "pae", "sse4.2", "pclmuldq", "fma", "tsc-deadline", "mmx", "osxsave", "cx8", "mce", "de", "rdtscp", "ht", "pse", "lahf_lm", "abm", "rdseed", "popcnt", "mca", "pdpe1gb", "apic", "sse", "f16c", "mpx", "invtsc", "pni", "aes", "avx2", "sse2", "ss", "hypervisor", "bmi1", "bmi2", "ssse3", "fpu", "cx16", "pse36", "mtrr", "movbe", "rdrand", "x2apic"], "topology": {"cores": 2, "cells": 1, "threads": 1, "sockets": 1}}
2017-12-14 10:43:24.284 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
supported_instances [[u'i686', u'qemu', u'hvm'], [u'x86_64', u'qemu', u'hvm']]
2017-12-14 10:43:24.285 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
limits {}
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metrics MonitorMetricList(objects=[])
2017-12-14 10:43:24.286 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
aggregates []
2017-12-14 10:43:24.292 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
instances {'aef838f5-8f9d-4ff2-8a34-17bd5ac05a8a': Instance(access_ip_v4=None,access_ip_v6=None,architecture=None,auto_disk_config=False,availability_zone=None,cell_name=None,cleaned=False,config_drive='',created_at=2016-11-29T09:59:42Z,default_ephemeral_device=None,default_swap_device=None,deleted=False,deleted_at=None,device_metadata=<?>,disable_terminate=False,display_description='selfservice-instance',display_name='selfservice-instance',ec2_ids=<?>,ephemeral_gb=0,ephemeral_key_uuid=None,fault=<?>,flavor=<?>,host='UbuntuStack',hostname='selfservice-instance',id=2,image_ref='e345e8b0-71b7-44e0-b1a1-e168f85a19f6',info_cache=<?>,instance_type_id=1,kernel_id='',key_data='ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDb088fU8458jkAfgBuvCC6fEwlYjM2Chnj3CHKaepskuZ556KKNqyVuVKxc813gagh/bIFu/tN4WMC0DXqR5+v9Sx3IoK2m35LMUe0Lukuii4Ztny3pJp4/zs/lRtOfc9w+ykrocw2yyw14KqGwOkh7QEESr8/CChc5T7d5IqpUWYHObZ2hVr8Z6JxP7wBQKT8wLCiZ8DtSkpNxrIBdZGEO/RaBAa2H1Jumik01Lh/2iXEDsI+ohcnd2trH/k3D7HYhfb2Oz/Da2CQISHenTJVUBaX19I3Eass6VflVYP8msQsPPdQVE5oQsYaNbzblYaLNT79z04Miu4VjeNjTTvb root@UbuntuStack
',key_name='mykey',keypairs=<?>,launch_index=0,launched_at=2016-11-29T10:00:29Z,launched_on='UbuntuStack',locked=False,locked_by=None,memory_mb=64,metadata=<?>,migration_context=<?>,new_flavor=<?>,node='ubuntustack',numa_topology=<?>,old_flavor=<?>,os_type=None,pci_devices=<?>,pci_requests=<?>,power_state=4,progress=0,project_id='c7ddc0ecab64419486df0d7f66e8174c',ramdisk_id='',reservation_id='r-s86llflp',root_device_name='/dev/vda',root_gb=1,security_groups=<?>,services=<?>,shutdown_terminate=False,system_metadata=<?>,tags=<?>,task_state=None,terminated_at=None,updated_at=2017-12-06T14:51:10Z,user_data=None,user_id='ffff52bbf1da4c86a3d2b57e977f6b82',uuid=aef838f5-8f9d-4ff2-8a34-17bd5ac05a8a,vcpu_model=<?>,vcpus=1,vm_mode=None,vm_state='stopped'), 'f7279e6b-7c15-421f-8c81-033fc9f70e30': Instance(access_ip_v4=None,access_ip_v6=None,architecture=None,auto_disk_config=False,availability_zone=None,cell_name=None,cleaned=False,config_drive='',created_at=2017-12-06T15:40:22Z,default_ephemeral_device=None,default_swap_device=None,deleted=False,deleted_at=None,device_metadata=<?>,disable_terminate=False,display_description='test',display_name='test',ec2_ids=<?>,ephemeral_gb=0,ephemeral_key_uuid=None,fault=<?>,flavor=<?>,host='UbuntuStack',hostname='test',id=3,image_ref='e345e8b0-71b7-44e0-b1a1-e168f85a19f6',info_cache=<?>,instance_type_id=1,kernel_id='',key_data='ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDb088fU8458jkAfgBuvCC6fEwlYjM2Chnj3CHKaepskuZ556KKNqyVuVKxc813gagh/bIFu/tN4WMC0DXqR5+v9Sx3IoK2m35LMUe0Lukuii4Ztny3pJp4/zs/lRtOfc9w+ykrocw2yyw14KqGwOkh7QEESr8/CChc5T7d5IqpUWYHObZ2hVr8Z6JxP7wBQKT8wLCiZ8DtSkpNxrIBdZGEO/RaBAa2H1Jumik01Lh/2iXEDsI+ohcnd2trH/k3D7HYhfb2Oz/Da2CQISHenTJVUBaX19I3Eass6VflVYP8msQsPPdQVE5oQsYaNbzblYaLNT79z04Miu4VjeNjTTvb root@UbuntuStack
',key_name='mykey',keypairs=<?>,launch_index=0,launched_at=2017-12-06T15:40:45Z,launched_on='UbuntuStack',locked=False,locked_by=None,memory_mb=64,metadata=<?>,migration_context=<?>,new_flavor=<?>,node='ubuntustack',numa_topology=<?>,old_flavor=<?>,os_type=None,pci_devices=<?>,pci_requests=<?>,power_state=4,progress=0,project_id='c7ddc0ecab64419486df0d7f66e8174c',ramdisk_id='',reservation_id='r-d00bhg7u',root_device_name='/dev/vda',root_gb=1,security_groups=<?>,services=<?>,shutdown_terminate=False,system_metadata=<?>,tags=<?>,task_state=None,terminated_at=None,updated_at=2017-12-13T06:50:48Z,user_data=None,user_id='ffff52bbf1da4c86a3d2b57e977f6b82',uuid=f7279e6b-7c15-421f-8c81-033fc9f70e30,vcpu_model=<?>,vcpus=1,vm_mode=None,vm_state='stopped')}
2017-12-14 10:43:24.293 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
ram_allocation_ratio 1.5
2017-12-14 10:43:24.294 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
cpu_allocation_ratio 16.0
2017-12-14 10:43:24.294 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -] disk_allocation_ratio 1.0
2017-12-14 10:43:24.294 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
updated 2017-12-14 02:43:13+00:00
2017-12-14 10:43:24.295 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
** Request Spect **
2017-12-14 10:43:24.295 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
memory_mb 64
2017-12-14 10:43:24.296 77206 INFO nova.scheduler.filters.dump_filter [req-6a06ba1d-aeaf-41a8-a922-0402c0be3444 ffff52bbf1da4c86a3d2b57e977f6b82 c7ddc0ecab64419486df0d7f66e8174c - - -]
vcpus 1
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