Rework nova_cell_v2_discover_host.py to use nova.conf and python novaclient
Previously nova_cell_v2_discover_host.py used environment variables passed to the script and it got deleted right after usage. This changed to: - read auth information from nova.conf - read host information from nova.conf - use python novaclient to check new services instead of subprocess calls Change-Id: Id08be90d6be89af66d94bc779f311702526eb788
This commit is contained in:
Martin Schuppert
parent
a7c230e4c4
commit
df7f43974e
@ -14,82 +14,96 @@
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# License for the specific language governing permissions and limitations
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# under the License.
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from __future__ import print_function
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import logging
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from optparse import OptionParser
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import os
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import pwd
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import socket
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import subprocess
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import sys
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import time
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# Delete this immediataly as it contains auth info
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os.unlink(__file__)
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# Only need root to read this script, drop to nova user
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nova_uid, nova_gid = pwd.getpwnam('nova')[2:4]
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os.setgid(nova_gid)
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os.setuid(nova_uid)
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from keystoneauth1 import loading
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from keystoneauth1 import session
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from novaclient import client
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os.environ.update(
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OS_PROJECT_DOMAIN_NAME='__OS_PROJECT_DOMAIN_NAME',
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OS_USER_DOMAIN_NAME='__OS_PROJECT_USER_NAME',
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OS_PROJECT_NAME='__OS_PROJECT_NAME',
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OS_USERNAME='__OS_USERNAME',
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OS_PASSWORD='__OS_PASSWORD',
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OS_AUTH_URL='__OS_AUTH_URL',
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OS_AUTH_TYPE='password',
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OS_IDENTITY_API_VERSION='3'
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)
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from six.moves.configparser import SafeConfigParser
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try:
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my_host = subprocess.check_output([
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'crudini',
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'--get',
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'/etc/nova/nova.conf',
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'DEFAULT',
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'host'
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], universal_newlines=True).rstrip()
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except subprocess.CalledProcessError:
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# If host isn't set nova defaults to this
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my_host = socket.gethostname()
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logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)
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LOG = logging.getLogger('nova_cell_v2_discover_host')
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# Wait until this host is listed in the service list then
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# run cellv2 host discovery
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retries = 10
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for i in range(retries):
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try:
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service_output = subprocess.check_output([
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'openstack',
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'-q',
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'--os-interface',
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'internal',
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'compute',
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'service',
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'list',
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'-c',
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'Host',
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'-c',
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'Zone',
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'-f',
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'value'
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], universal_newlines=True)
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service_list = service_output.split('\n')
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for entry in service_list:
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# skip any empty lines
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if not entry:
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continue
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host, zone = entry.split()
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if host == my_host and zone != 'internal':
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print('(cellv2) Service registered, running discovery')
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sys.exit(subprocess.call([
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'/usr/bin/nova-manage',
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'cell_v2',
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'discover_hosts',
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'--by-service',
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'--verbose'
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]))
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print('(cellv2) Waiting for service to register')
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except subprocess.CalledProcessError:
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print('(cellv2) Retrying')
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time.sleep(30)
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nova_cfg = '/etc/nova/nova.conf'
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if __name__ == '__main__':
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parser = OptionParser(usage="usage: %prog [options]")
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parser.add_option('-k', '--insecure',
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action="store_false",
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dest='insecure',
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default=True,
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help='Allow insecure connection when using SSL')
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(options, args) = parser.parse_args()
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LOG.debug('Running with parameter insecure = %s',
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options.insecure)
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if os.path.isfile(nova_cfg):
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config = SafeConfigParser()
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config.read(nova_cfg)
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else:
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LOG.error('Nova configuration file %s does not exist', nova_cfg)
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sys.exit(1)
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my_host = config.get('DEFAULT', 'host')
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if not my_host:
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# If host isn't set nova defaults to this
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my_host = socket.gethostname()
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loader = loading.get_plugin_loader('password')
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auth = loader.load_from_options(
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auth_url=config.get('neutron',
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'auth_url'),
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username=config.get('neutron',
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'username'),
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password=config.get('neutron',
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'password'),
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project_name=config.get('neutron',
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'project_name'),
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project_domain_name=config.get('neutron',
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'project_domain_name'),
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user_domain_name=config.get('neutron',
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'user_domain_name'))
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sess = session.Session(auth=auth, verify=options.insecure)
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nova = client.Client('2.11', session=sess, endpoint_type='internal')
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# Wait until this host is listed in the service list then
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# run cellv2 host discovery
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retries = 10
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for i in range(retries):
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try:
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service_list = nova.services.list(binary='nova-compute')
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for entry in service_list:
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host = getattr(entry, 'host', '')
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zone = getattr(entry, 'zone', '')
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if host == my_host and zone != 'internal':
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LOG.info('(cellv2) Service registered, running discovery')
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sys.exit(subprocess.call([
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'/usr/bin/nova-manage',
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'cell_v2',
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'discover_hosts',
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'--by-service',
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'--verbose'
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]))
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if len(service_list) == 0:
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LOG.warning('(cellv2) no nova-compute service registered' +
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' after %i checks', i)
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LOG.info('(cellv2) Waiting for service to register')
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except subprocess.CalledProcessError:
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LOG.info('(cellv2) Retrying')
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except Exception as e:
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LOG.exception('Error during host discovery:')
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time.sleep(30)
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sys.exit(1)
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# vim: set et ts=4 sw=4 :
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