db.py

#!/usr/bin/python

import sys

from oslo.config import cfg
from sqlalchemy import create_engine

cfg_file = "/etc/nova/nova.conf"


def get_sql_connection_cfg():
    opt_group = cfg.OptGroup(name='DEFAULT', title='Test example')
    test_opts = [
        cfg.StrOpt(
            'sql_connection',
            default='sqlite:///state_path/sqlite_db',
            help='Connection string for SQL database.'),
    ]

    CONF = cfg.CONF
    CONF.register_group(opt_group)
    CONF.register_opts(test_opts, opt_group)
    CONF(default_config_files=[cfg_file])

    return CONF.DEFAULT.sql_connection


sql_connection = get_sql_connection_cfg()

engine = create_engine(sql_connection)
conn = engine.connect()
state, status = conn.execute(
    "SHOW GLOBAL STATUS LIKE 'wsrep_local_state_comment'").fetchall()[0]

if status == u'Synced':
    print "ALL OK"
    sys.exit(0)
else:
    print "ERROR"
    sys.exit(1)