Heat templates for deploying OpenStack
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#!/usr/bin/env python
import os
import sys
import time
import inspect
import logging
import argparse
import oslo_config.cfg
import requests.exceptions
def is_forced_down(connection, hostname):
services = connection.services.list(host=hostname, binary="nova-compute")
for service in services:
if service.forced_down:
return True
return False
def evacuations_done(connection, hostname):
# Get a list of migrations.
# :param host: (optional) filter migrations by host name.
# :param status: (optional) filter migrations by status.
# :param cell_name: (optional) filter migrations for a cell.
migrations = connection.migrations.list(host=hostname)
print("Checking %d migrations" % len(migrations))
for migration in migrations:
# print migration.to_dict()
# {
# u'status': u'error',
# u'dest_host': None,
# u'new_instance_type_id': 2,
# u'old_instance_type_id': 2,
# u'updated_at': u'2018-04-22T20:55:29.000000',
# u'dest_compute':
# u'overcloud-novacompute-2.localdomain',
# u'migration_type': u'live-migration',
# u'source_node':
# u'overcloud-novacompute-0.localdomain',
# u'id': 8,
# u'created_at': u'2018-04-22T20:52:58.000000',
# u'instance_uuid':
# u'd1c82ce8-3dc5-48db-b59f-854b3b984ef1',
# u'dest_node':
# u'overcloud-novacompute-2.localdomain',
# u'source_compute':
# u'overcloud-novacompute-0.localdomain'
# }
# Acceptable: done, completed, failed
if migration.status in ["running", "accepted", "pre-migrating"]:
return False
return True
def safe_to_start(connection, hostname):
if is_forced_down(connection, hostname):
print("Waiting for fence-down flag to be cleared")
return False
if not evacuations_done(connection, hostname):
print("Waiting for evacuations to complete or fail")
return False
return True
def create_nova_connection(options):
from novaclient import client
from novaclient.exceptions import NotAcceptable
except ImportError:
print("Nova not found or not accessible")
from keystoneauth1 import loading
from keystoneauth1 import session
from keystoneclient import discover
# Prefer the oldest and strip the leading 'v'
keystone_versions = discover.available_versions(options["auth_url"][0])
keystone_version = keystone_versions[0]['id'][1:]
kwargs = dict(
if discover.version_match("2", keystone_version):
kwargs["tenant_name"] = options["tenant_name"][0]
elif discover.version_match("3", keystone_version):
kwargs["project_name"] = options["project_name"][0]
kwargs["user_domain_name"] = options["user_domain_name"][0]
kwargs["project_domain_name"] = options["project_domain_name"][0]
loader = loading.get_plugin_loader('password')
keystone_auth = loader.load_from_options(**kwargs)
keystone_session = session.Session(auth=keystone_auth, verify=(not options["insecure"]))
nova_endpoint_type = 'internalURL'
# We default to internalURL but we allow this to be overridden via
# the [placement]/os_interface key.
if 'os_interface' in options and len(options["os_interface"]) == 1:
nova_endpoint_type = options["os_interface"][0]
# Via https://review.opendev.org/#/c/492247/ os_interface has been deprecated in queens
# and we need to use 'valid_interfaces' which is a:
# "List of interfaces, in order of preference, for endpoint URL. (list value)"
# Since it is not explicitely set in nova.conf we still keep the check for os_interface
elif 'valid_interfaces' in options and len(options["valid_interfaces"]) >= 1:
nova_endpoint_type = options["valid_interfaces"][0]
# This mimicks the code in novaclient/shell.py
if nova_endpoint_type in ['internal', 'public', 'admin']:
nova_endpoint_type += 'URL'
if 'region_name' in options:
region = options['region_name'][0]
elif 'os_region_name' in options:
region = options['os_region_name'][0]
else: # We actually try to make a client call even with an empty region
region = None
nova_versions = [ "2.23", "2" ]
for version in nova_versions:
clientargs = inspect.getargspec(client.Client).varargs
# Some versions of Openstack prior to Ocata only
# supported positional arguments for username,
# password, and tenant.
# Versions since Ocata only support named arguments.
# So we need to use introspection to figure out how to
# create a Nova client.
# Happy days
if clientargs:
# OSP < Ocata
# ArgSpec(args=['version', 'username', 'password', 'project_id', 'auth_url'],
# varargs=None,
# keywords='kwargs', defaults=(None, None, None, None))
nova = client.Client(version,
None, # User
None, # Password
None, # Tenant
None, # Auth URL
session=keystone_session, auth=keystone_auth,
http_log_debug="verbose" in options,
# OSP >= Ocata
# ArgSpec(args=['version'], varargs='args', keywords='kwargs', defaults=None)
nova = client.Client(version,
session=keystone_session, auth=keystone_auth,
http_log_debug="verbose" in options,
return nova
except NotAcceptable as e:
except Exception as e:
logging.warning("Nova connection failed. %s: %s" % (e.__class__.__name__, e))
print("Couldn't obtain a supported connection to nova, tried: %s\n" % repr(nova_versions))
return None
parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('--config-file', dest='nova_config', action='store',
help='path to nova configuration (default: /etc/nova/nova.conf)')
parser.add_argument('--nova-binary', dest='nova_binary', action='store',
help='path to nova compute binary (default: /usr/bin/nova-compute)')
parser.add_argument('--enable-file', dest='enable_file', action='store',
help='file exists if instance HA is enabled on this host '\
'(default: /var/lib/nova/instanceha/enabled)')
sections = {}
(args, remaining) = parser.parse_known_args(sys.argv)
config = oslo_config.cfg.ConfigParser(args.nova_config, sections)
config.sections["placement"]["insecure"] = 0
config.sections["placement"]["verbose"] = 1
if os.path.isfile(args.enable_file):
connection = None
while not connection:
# Loop in case the control plane is recovering when we run
connection = create_nova_connection(config.sections["placement"])
if not connection:
while not safe_to_start(connection, config.sections["DEFAULT"]["host"][0]):
real_args = [args.nova_binary, '--config-file', args.nova_config]
os.execv(args.nova_binary, real_args)