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nova_compute_hooks.py
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nova_compute_hooks.py
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#!/usr/bin/env python3
#
# Copyright 2016 Canonical Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import base64
import json
import platform
import sys
import uuid
import os
import subprocess
import grp
import shutil
import charmhelpers.core.unitdata as unitdata
from charmhelpers.core.hookenv import (
Hooks,
config,
is_relation_made,
local_unit,
log,
DEBUG,
relation_ids,
remote_service_name,
related_units,
relation_get,
relation_set,
service_name,
UnregisteredHookError,
status_set,
)
from charmhelpers.core.templating import (
render
)
from charmhelpers.core.host import (
service_restart,
service_running,
service_start,
service_stop,
write_file,
umount,
is_container,
)
from charmhelpers.fetch import (
apt_install,
apt_purge,
apt_update,
filter_installed_packages,
)
from charmhelpers.contrib.openstack.utils import (
CompareOpenStackReleases,
configure_installation_source,
is_unit_paused_set,
openstack_upgrade_available,
os_release,
pausable_restart_on_change as restart_on_change,
series_upgrade_complete,
series_upgrade_prepare,
)
from charmhelpers.contrib.storage.linux.ceph import (
ensure_ceph_keyring,
CephBrokerRq,
CephBrokerRsp,
delete_keyring,
is_broker_action_done,
mark_broker_action_done,
get_broker_rsp_key,
get_request_states,
get_previous_request,
)
from charmhelpers.payload.execd import execd_preinstall
from nova_compute_utils import (
create_libvirt_secret,
determine_packages,
import_authorized_keys,
import_keystone_ca_cert,
initialize_ssh_keys,
migration_enabled,
do_openstack_upgrade,
public_ssh_key,
restart_map,
services,
register_configs,
NOVA_CONF,
ceph_config_file, CEPH_SECRET,
CEPH_BACKEND_SECRET,
enable_shell, disable_shell,
configure_lxd,
fix_path_ownership,
assert_charm_supports_ipv6,
install_hugepages,
get_hugepage_number,
assess_status,
set_ppc64_cpu_smt_state,
remove_libvirt_network,
network_manager,
libvirt_daemon,
LIBVIRT_TYPES,
configure_local_ephemeral_storage,
pause_unit_helper,
resume_unit_helper,
get_availability_zone,
remove_old_packages,
MULTIPATH_PACKAGES,
USE_FQDN_KEY,
)
from charmhelpers.contrib.network.ip import (
get_relation_ip,
)
from charmhelpers.core.unitdata import kv
from nova_compute_context import (
nova_metadata_requirement,
CEPH_SECRET_UUID,
assert_libvirt_rbd_imagebackend_allowed,
NovaAPIAppArmorContext,
NovaComputeAppArmorContext,
NovaNetworkAppArmorContext,
)
from charmhelpers.contrib.charmsupport import nrpe
from charmhelpers.core.sysctl import create as create_sysctl
from charmhelpers.contrib.hardening.harden import harden
from socket import gethostname
import charmhelpers.contrib.openstack.vaultlocker as vaultlocker
hooks = Hooks()
CONFIGS = register_configs()
MIGRATION_AUTH_TYPES = ["ssh"]
LIBVIRTD_PID = '/var/run/libvirtd.pid'
@hooks.hook('install.real')
@harden()
def install():
status_set('maintenance', 'Executing pre-install')
execd_preinstall()
configure_installation_source(config('openstack-origin'))
status_set('maintenance', 'Installing apt packages')
apt_update()
apt_install(determine_packages(), fatal=True)
# Start migration to agent registration with FQDNs for newly installed
# units with OpenStack release Stein or newer.
release = os_release('nova-common')
if CompareOpenStackReleases(release) >= 'stein':
db = kv()
db.set(USE_FQDN_KEY, True)
db.flush()
install_vaultlocker()
@hooks.hook('config-changed')
@restart_on_change(restart_map())
@harden()
def config_changed():
if is_unit_paused_set():
log("Do not run config_changed when paused", "WARNING")
return
if config('ephemeral-unmount'):
umount(config('ephemeral-unmount'), persist=True)
if config('prefer-ipv6'):
status_set('maintenance', 'configuring ipv6')
assert_charm_supports_ipv6()
if (migration_enabled() and
config('migration-auth-type') not in MIGRATION_AUTH_TYPES):
message = ("Invalid migration-auth-type")
status_set('blocked', message)
raise Exception(message)
global CONFIGS
send_remote_restart = False
if not config('action-managed-upgrade'):
if openstack_upgrade_available('nova-common'):
status_set('maintenance', 'Running openstack upgrade')
do_openstack_upgrade(CONFIGS)
send_remote_restart = True
sysctl_settings = config('sysctl')
if sysctl_settings and not is_container():
create_sysctl(
sysctl_settings,
'/etc/sysctl.d/50-nova-compute.conf',
# Some keys in the config may not exist in /proc/sys/net/.
# For example, the conntrack module may not be loaded when
# using lxd drivers insteam of kvm. In these cases, we
# simply ignore the missing keys, rather than making time
# consuming calls out to the filesystem to check for their
# existence.
ignore=True)
remove_libvirt_network('default')
if migration_enabled() and config('migration-auth-type') == 'ssh':
# Check-in with nova-c-c and register new ssh key, if it has just been
# generated.
status_set('maintenance', 'SSH key exchange')
initialize_ssh_keys()
import_authorized_keys()
if config('enable-resize') is True:
enable_shell(user='nova')
status_set('maintenance', 'SSH key exchange')
initialize_ssh_keys(user='nova')
import_authorized_keys(user='nova', prefix='nova')
else:
disable_shell(user='nova')
if config('instances-path') is not None:
fp = config('instances-path')
fix_path_ownership(fp, user='nova')
for rid in relation_ids('cloud-compute'):
compute_joined(rid)
for rid in relation_ids('neutron-plugin'):
neutron_plugin_joined(rid, remote_restart=send_remote_restart)
for rid in relation_ids('nova-ceilometer'):
nova_ceilometer_joined(rid, remote_restart=send_remote_restart)
if is_relation_made("nrpe-external-master"):
update_nrpe_config()
if config('hugepages'):
install_hugepages()
# Disable smt for ppc64, required for nova/libvirt/kvm
arch = platform.machine()
log('CPU architecture: {}'.format(arch))
if arch in ['ppc64el', 'ppc64le']:
set_ppc64_cpu_smt_state('off')
# NOTE(jamespage): trigger any configuration related changes
# for cephx permissions restrictions and
# keys on disk for ceph-access backends
for rid in relation_ids('ceph'):
for unit in related_units(rid):
ceph_changed(rid=rid, unit=unit)
for rid in relation_ids('ceph-access'):
for unit in related_units(rid):
ceph_access(rid=rid, unit=unit)
CONFIGS.write_all()
NovaComputeAppArmorContext().setup_aa_profile()
if (network_manager() in ['flatmanager', 'flatdhcpmanager'] and
config('multi-host').lower() == 'yes'):
NovaAPIAppArmorContext().setup_aa_profile()
NovaNetworkAppArmorContext().setup_aa_profile()
install_vaultlocker()
install_multipath()
configure_local_ephemeral_storage()
check_and_start_iscsid()
def install_vaultlocker():
"""Determine whether vaultlocker is required and install"""
if config('encrypt'):
installed = len(filter_installed_packages(['vaultlocker'])) == 0
if not installed:
apt_install('vaultlocker', fatal=True)
def install_multipath():
if config('use-multipath'):
installed = len(filter_installed_packages(MULTIPATH_PACKAGES)) == 0
if not installed:
apt_install(MULTIPATH_PACKAGES, fatal=True)
@hooks.hook('amqp-relation-joined')
def amqp_joined(relation_id=None):
relation_set(relation_id=relation_id,
username=config('rabbit-user'),
vhost=config('rabbit-vhost'))
@hooks.hook('amqp-relation-changed')
@hooks.hook('amqp-relation-departed')
@restart_on_change(restart_map())
def amqp_changed():
if 'amqp' not in CONFIGS.complete_contexts():
log('amqp relation incomplete. Peer not ready?')
return
CONFIGS.write(NOVA_CONF)
@hooks.hook('image-service-relation-changed')
@restart_on_change(restart_map())
def image_service_changed():
if 'image-service' not in CONFIGS.complete_contexts():
log('image-service relation incomplete. Peer not ready?')
return
CONFIGS.write(NOVA_CONF)
@hooks.hook('ephemeral-backend-relation-changed',
'ephemeral-backend-relation-broken')
@restart_on_change(restart_map())
def ephemeral_backend_hook():
if 'ephemeral-backend' not in CONFIGS.complete_contexts():
log('ephemeral-backend relation incomplete. Peer not ready?')
return
CONFIGS.write(NOVA_CONF)
@hooks.hook('cloud-compute-relation-joined')
def compute_joined(rid=None):
# NOTE(james-page) in MAAS environments the actual hostname is a CNAME
# record so won't get scanned based on private-address which is an IP
# add the hostname configured locally to the relation.
settings = {
'hostname': gethostname(),
'private-address': get_relation_ip(
'cloud-compute', cidr_network=config('os-internal-network')),
}
if migration_enabled():
auth_type = config('migration-auth-type')
settings['migration_auth_type'] = auth_type
if auth_type == 'ssh':
settings['ssh_public_key'] = public_ssh_key()
relation_set(relation_id=rid, **settings)
if config('enable-resize'):
settings['nova_ssh_public_key'] = public_ssh_key(user='nova')
relation_set(relation_id=rid, **settings)
@hooks.hook('cloud-compute-relation-changed')
@restart_on_change(restart_map())
def compute_changed():
# rewriting all configs to pick up possible net or vol manager
# config advertised from controller.
CONFIGS.write_all()
import_authorized_keys()
import_authorized_keys(user='nova', prefix='nova')
import_keystone_ca_cert()
@hooks.hook('ceph-access-relation-joined')
@hooks.hook('ceph-relation-joined')
@restart_on_change(restart_map())
def ceph_joined():
pkgs = filter_installed_packages(['ceph-common'])
if pkgs:
status_set('maintenance', 'Installing ceph-common package')
apt_install(pkgs, fatal=True)
# Bug 1427660
if not is_unit_paused_set() and config('virt-type') in LIBVIRT_TYPES:
service_restart(libvirt_daemon())
def get_ceph_request():
rq = CephBrokerRq()
if (config('libvirt-image-backend') == 'rbd' and
assert_libvirt_rbd_imagebackend_allowed()):
name = config('rbd-pool')
replicas = config('ceph-osd-replication-count')
weight = config('ceph-pool-weight')
rq.add_op_create_pool(name=name, replica_count=replicas, weight=weight,
group='vms', app_name='rbd')
if config('restrict-ceph-pools'):
rq.add_op_request_access_to_group(
name="volumes",
object_prefix_permissions={'class-read': ['rbd_children']},
permission='rwx')
rq.add_op_request_access_to_group(
name="images",
object_prefix_permissions={'class-read': ['rbd_children']},
permission='rwx')
rq.add_op_request_access_to_group(
name="vms",
object_prefix_permissions={'class-read': ['rbd_children']},
permission='rwx')
return rq
@hooks.hook('ceph-relation-changed')
@restart_on_change(restart_map())
def ceph_changed(rid=None, unit=None):
if 'ceph' not in CONFIGS.complete_contexts():
log('ceph relation incomplete. Peer not ready?')
return
if not ensure_ceph_keyring(service=service_name(), user='nova',
group='nova'):
log('Could not create ceph keyring: peer not ready?')
return
CONFIGS.write(ceph_config_file())
CONFIGS.write(CEPH_SECRET)
CONFIGS.write(NOVA_CONF)
# With some refactoring, this can move into NovaComputeCephContext
# and allow easily extended to support other compute flavors.
key = relation_get(attribute='key', rid=rid, unit=unit)
if config('virt-type') in ['kvm', 'qemu', 'lxc'] and key:
create_libvirt_secret(secret_file=CEPH_SECRET,
secret_uuid=CEPH_SECRET_UUID, key=key)
_handle_ceph_request()
# TODO: Refactor this method moving part of this logic to charmhelpers,
# refacting the existing ones.
def _handle_ceph_request():
"""Handles the logic for sending and acknowledging Ceph broker requests."""
# First, we create a request. We will test if this request is equivalent
# to a previous one. If it is not, we will send it.
request = get_ceph_request()
log("New ceph request {} created.".format(request.request_id), level=DEBUG)
# Here we will know if the new request is equivalent, and if it is, whether
# it has completed, or just sent.
states = get_request_states(request, relation='ceph')
log("Request states: {}.".format(states), level=DEBUG)
complete = True
sent = True
# According to existing ceph broker messaging logic, we are expecting only
# 1 rid.
for rid in states.keys():
if not states[rid]['complete']:
complete = False
if not states[rid]['sent']:
sent = False
if not sent and not complete:
break
# If either complete or sent is True, then get_request_states has validated
# that the current request is equivalent to a previously sent request.
if complete:
log('Previous request complete.')
# If the request is complete, we need to restart nova once and mark it
# restarted. The broker response comes from a specific unit, and can
# only be read when this hook is invoked by the remote unit (the
# broker), unless specifically queried for the given unit. Therefore,
# we iterate across all units to find which has the broker response,
# and we process the response regardless of this execution context.
broker_rid, broker_unit = _get_broker_rid_unit_for_previous_request()
# If we cannot determine which unit has the response, then it means
# there is no response yet.
if (broker_rid, broker_unit) == (None, None):
log("Aborting because there is no broker response "
"for any unit at the moment.", level=DEBUG)
return
# Ensure that nova-compute is restarted since only now can we
# guarantee that ceph resources are ready, but only if not paused.
if (not is_unit_paused_set() and
not is_broker_action_done('nova_compute_restart', broker_rid,
broker_unit)):
log('Restarting Nova Compute as per request '
'{}.'.format(request.request_id), level=DEBUG)
service_restart('nova-compute')
mark_broker_action_done('nova_compute_restart',
broker_rid, broker_unit)
else:
if sent:
log("Request {} already sent, not sending "
"another.".format(request.request_id), level=DEBUG)
else:
log("Request {} not sent, sending it "
"now.".format(request.request_id), level=DEBUG)
for rid in relation_ids('ceph'):
log('Sending request {}'.format(request.request_id),
level=DEBUG)
relation_set(relation_id=rid, broker_req=request.request)
# TODO: Move this method to charmhelpers while refactoring the existing ones
def _get_broker_rid_unit_for_previous_request():
"""Gets the broker rid and unit combination that has a response for the
previous sent request."""
broker_key = get_broker_rsp_key()
log("Broker key is {}.".format(broker_key), level=DEBUG)
for rid in relation_ids('ceph'):
previous_request = get_previous_request(rid)
for unit in related_units(rid):
rdata = relation_get(rid=rid, unit=unit)
if rdata.get(broker_key):
rsp = CephBrokerRsp(rdata.get(broker_key))
if rsp.request_id == previous_request.request_id:
log("Found broker rid/unit: {}/{}".format(rid, unit),
level=DEBUG)
return rid, unit
log("There is no broker response for any unit at the moment.", level=DEBUG)
return None, None
@hooks.hook('ceph-relation-broken')
def ceph_broken():
service = service_name()
delete_keyring(service=service)
CONFIGS.write_all()
@hooks.hook('amqp-relation-broken', 'image-service-relation-broken')
@restart_on_change(restart_map())
def relation_broken():
CONFIGS.write_all()
@hooks.hook('upgrade-charm.real')
@harden()
def upgrade_charm():
apt_install(filter_installed_packages(determine_packages()),
fatal=True)
# NOTE: ensure psutil install for hugepages configuration
status_set('maintenance', 'Installing apt packages')
apt_install(filter_installed_packages(['python-psutil']))
packages_removed = remove_old_packages()
if packages_removed and not is_unit_paused_set():
log("Package purge detected, restarting services", "INFO")
for s in services():
service_restart(s)
for r_id in relation_ids('amqp'):
amqp_joined(relation_id=r_id)
if is_relation_made('nrpe-external-master'):
update_nrpe_config()
# Fix previously wrongly created path permissions
# LP: https://bugs.launchpad.net/charm-cinder-ceph/+bug/1779676
asok_path = '/var/run/ceph/'
gid = grp.getgrnam("kvm").gr_gid
if gid and os.path.isdir(asok_path) and gid != os.stat(asok_path).st_gid:
log("{} not owned by group 'kvm', fixing permissions."
.format(asok_path))
shutil.chown(asok_path, group='kvm')
@hooks.hook('nova-ceilometer-relation-joined')
def nova_ceilometer_joined(relid=None, remote_restart=False):
if remote_restart:
rel_settings = {
'restart-trigger': str(uuid.uuid4())}
relation_set(relation_id=relid, relation_settings=rel_settings)
@hooks.hook('nova-ceilometer-relation-changed')
@restart_on_change(restart_map())
def nova_ceilometer_relation_changed():
CONFIGS.write_all()
@hooks.hook('nrpe-external-master-relation-joined',
'nrpe-external-master-relation-changed')
def update_nrpe_config():
# python-dbus is used by check_upstart_job
apt_install('python-dbus')
hostname = nrpe.get_nagios_hostname()
current_unit = nrpe.get_nagios_unit_name()
nrpe_setup = nrpe.NRPE(hostname=hostname)
monitored_services = services()
try:
# qemu-kvm is a one-shot service
monitored_services.remove('qemu-kvm')
except ValueError:
pass
nrpe.add_init_service_checks(nrpe_setup, monitored_services, current_unit)
nrpe_setup.write()
@hooks.hook('neutron-plugin-relation-joined')
def neutron_plugin_joined(relid=None, remote_restart=False):
rel_settings = {
'hugepage_number': get_hugepage_number(),
'default_availability_zone': get_availability_zone()
}
if remote_restart:
rel_settings['restart-trigger'] = str(uuid.uuid4())
relation_set(relation_id=relid,
**rel_settings)
@hooks.hook('neutron-plugin-relation-changed')
@restart_on_change(restart_map())
def neutron_plugin_changed():
enable_nova_metadata, _ = nova_metadata_requirement()
if enable_nova_metadata:
apt_update()
apt_install(filter_installed_packages(['nova-api-metadata']),
fatal=True)
else:
apt_purge('nova-api-metadata', fatal=True)
service_restart_handler(default_service='nova-compute')
CONFIGS.write(NOVA_CONF)
# TODO(jamespage): Move this into charmhelpers for general reuse.
def service_restart_handler(relation_id=None, unit=None,
default_service=None):
'''Handler for detecting requests from subordinate
charms for restarts of services'''
restart_nonce = relation_get(attribute='restart-nonce',
unit=unit,
rid=relation_id)
db = unitdata.kv()
nonce_key = 'restart-nonce'
if restart_nonce != db.get(nonce_key):
if not is_unit_paused_set():
service = relation_get(attribute='remote-service',
unit=unit,
rid=relation_id) or default_service
if service:
service_restart(service)
db.set(nonce_key, restart_nonce)
db.flush()
@hooks.hook('lxd-relation-joined')
def lxd_joined(relid=None):
relation_set(relation_id=relid,
user='nova')
@hooks.hook('lxd-relation-changed')
@restart_on_change(restart_map())
def lxc_changed():
nonce = relation_get('nonce')
db = kv()
if nonce and db.get('lxd-nonce') != nonce:
db.set('lxd-nonce', nonce)
configure_lxd(user='nova')
CONFIGS.write(NOVA_CONF)
@hooks.hook('ceph-access-relation-changed')
def ceph_access(rid=None, unit=None):
'''Setup libvirt secret for specific ceph backend access'''
key = relation_get('key', unit, rid)
uuid = relation_get('secret-uuid', unit, rid)
if key and uuid:
remote_service = remote_service_name(rid)
if config('virt-type') in LIBVIRT_TYPES:
secrets_filename = CEPH_BACKEND_SECRET.format(remote_service)
render(os.path.basename(CEPH_SECRET), secrets_filename,
context={'ceph_secret_uuid': uuid,
'service_name': remote_service})
create_libvirt_secret(secret_file=secrets_filename,
secret_uuid=uuid,
key=key)
# NOTE(jamespage): LXD ceph integration via host rbd mapping, so
# install keyring for rbd commands to use
ensure_ceph_keyring(service=remote_service,
user='nova', group='nova',
key=key)
@hooks.hook('secrets-storage-relation-joined')
def secrets_storage_joined(relation_id=None):
relation_set(relation_id=relation_id,
secret_backend=vaultlocker.VAULTLOCKER_BACKEND,
isolated=True,
access_address=get_relation_ip('secrets-storage'),
hostname=gethostname())
@hooks.hook('secrets-storage-relation-changed')
def secrets_storage_changed():
vault_ca = relation_get('vault_ca')
if vault_ca:
vault_ca = base64.decodebytes(json.loads(vault_ca).encode())
write_file('/usr/local/share/ca-certificates/vault-ca.crt',
vault_ca, perms=0o644)
subprocess.check_call(['update-ca-certificates', '--fresh'])
configure_local_ephemeral_storage()
@hooks.hook('storage.real')
def storage_changed():
configure_local_ephemeral_storage()
@hooks.hook('cloud-credentials-relation-joined')
def cloud_credentials_joined():
svc_name = local_unit().split('/')[0].replace('-', '_')
relation_set(username=svc_name)
@hooks.hook('cloud-credentials-relation-changed')
@restart_on_change(restart_map())
def cloud_credentials_changed():
CONFIGS.write(NOVA_CONF)
def check_and_start_iscsid():
if not service_running('iscsid'):
service_start('iscsid')
@hooks.hook('update-status')
@harden()
def update_status():
log('Updating status.')
@hooks.hook('pre-series-upgrade')
def pre_series_upgrade():
log("Running prepare series upgrade hook", "INFO")
series_upgrade_prepare(
pause_unit_helper, CONFIGS)
@hooks.hook('post-series-upgrade')
def post_series_upgrade():
log("Running complete series upgrade hook", "INFO")
service_stop('nova-compute')
service_stop(libvirt_daemon())
# After package upgrade the service is broken and leaves behind a
# PID file which causes the service to fail to start.
# Remove this before restart
if os.path.exists(LIBVIRTD_PID):
os.unlink(LIBVIRTD_PID)
series_upgrade_complete(
resume_unit_helper, CONFIGS)
def main():
try:
hooks.execute(sys.argv)
except UnregisteredHookError as e:
log('Unknown hook {} - skipping.'.format(e))
assess_status(CONFIGS)
if __name__ == '__main__':
main()