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[Bug 1662789] Re: qlalchemy.exc.OperationalError

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1662789@xxxxxxxxxxxxxxxxxx>
Date: Sun, 30 Apr 2017 04:17:33 -0000
Reply-to: Bug 1662789 <1662789@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1662789

Title:
  qlalchemy.exc.OperationalError

Status in OpenStack Compute (nova):
  Expired

Bug description:
  I am a beginner, trying to build a house.

  Openstack Mitaka
  Centos 7

  host            
  controller     192.168.100.10      192.168.100.20
  compute      192.168.200.10      192.168.200.20

  ==================================

  neutron network
  name          IP
  ext-net	ext-subnet 192.168.200.0/24    (external network)

  net200  net200-subnet 200.0.0.0/24    (internal network)

  net100  net100-subnet 100.0.0.0/24    (internal network)


  I created two nodes, the name is 'controller' and 'compute' . Is the
  same name and server . Each node is a double network and Intranet .
  When I attached floating IP cannot access nodes . Then remove nodes .

  When I recreate the tip cannot be created .

  Here is the error log

  [root@controller nova]# cat nova-api.log 
  2017-02-08 22:10:11.451 19199 INFO nova.osapi_compute.wsgi.server [req-eaca421f-2f82-4cde-8f4c-43eeb48130d1 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "GET /v2.1/5c0b88983228434986d355142b27ae59/flavors/5/os-extra_specs HTTP/1.1" status: 200 len: 286 time: 0.0261800
  2017-02-08 22:10:11.554 19199 INFO nova.osapi_compute.wsgi.server [req-f61100ba-a245-454a-baf3-8a1c74a8f021 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "GET /v2.1/5c0b88983228434986d355142b27ae59/extensions HTTP/1.1" status: 200 len: 21766 time: 0.0557902
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions [req-27f90911-7f89-45c1-80ba-34ed58f51c08 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] Unexpected exception in API method
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions Traceback (most recent call last):
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/extensions.py", line 478, in wrapped
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return f(*args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 73, in wrapper
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 73, in wrapper
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 73, in wrapper
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/servers.py", line 629, in create
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     **create_kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/hooks.py", line 154, in inner
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     rv = f(*args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1562, in create
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     check_server_group_quota=check_server_group_quota)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1175, in _create_instance
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     instance_group, check_server_group_quota, filter_properties)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1033, in _provision_instances
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     quotas.rollback()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self.force_reraise()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     six.reraise(self.type_, self.value, self.tb)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 975, in _provision_instances
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     req_spec.create()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 223, in wrapper
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return fn(self, *args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/objects/request_spec.py", line 432, in create
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     db_spec = self._create_in_db(self._context, updates)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 708, in wrapper
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     with self._transaction_scope(context):
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return self.gen.next()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 759, in _transaction_scope
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     allow_async=self._allow_async) as resource:
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return self.gen.next()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 491, in _session
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     bind=self.connection, mode=self.mode)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 272, in _create_session
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self._start()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 338, in _start
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     engine_args, maker_args)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 362, in _setup_for_connection
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     sql_connection=sql_connection, **engine_kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 152, in create_engine
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     test_conn = _test_connection(engine, max_retries, retry_interval)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 326, in _test_connection
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return engine.connect()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2018, in connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return self._connection_cls(self, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 72, in __init__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     if connection is not None else engine.raw_connection()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2104, in raw_connection
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self.pool.unique_connection, _connection)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2078, in _wrap_pool_connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     e, dialect, self)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1401, in _handle_dbapi_exception_noconnection
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     util.raise_from_cause(newraise, exc_info)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/compat.py", line 200, in raise_from_cause
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     reraise(type(exception), exception, tb=exc_tb)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2074, in _wrap_pool_connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return fn()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 318, in unique_connection
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return _ConnectionFairy._checkout(self)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 713, in _checkout
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     fairy = _ConnectionRecord.checkout(pool)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 480, in checkout
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     rec = pool._do_get()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1060, in _do_get
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self._dec_overflow()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     compat.reraise(exc_type, exc_value, exc_tb)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1057, in _do_get
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return self._create_connection()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 323, in _create_connection
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return _ConnectionRecord(self)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 449, in __init__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self.connection = self.__connect()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 607, in __connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     connection = self.__pool._invoke_creator(self)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 97, in connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return dialect.connect(*cargs, **cparams)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/default.py", line 385, in connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return self.dbapi.connect(*cargs, **cparams)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/__init__.py", line 88, in Connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     return Connection(*args, **kwargs)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 657, in __init__
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self.connect()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 851, in connect
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     self._request_authentication()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 1034, in _request_authentication
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     auth_packet = self._read_packet()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 906, in _read_packet
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     packet.check_error()
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 367, in check_error
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     err.raise_mysql_exception(self._data)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/err.py", line 120, in raise_mysql_exception
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     _check_mysql_exception(errinfo)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/err.py", line 112, in _check_mysql_exception
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions     raise errorclass(errno, errorvalue)
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions OperationalError: (pymysql.err.OperationalError) (1040, u'Too many connections')
  2017-02-08 22:10:34.057 19199 ERROR nova.api.openstack.extensions 
  2017-02-08 22:10:34.065 19199 INFO nova.api.openstack.wsgi [req-27f90911-7f89-45c1-80ba-34ed58f51c08 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'sqlalchemy.exc.OperationalError'>
  2017-02-08 22:10:34.066 19199 INFO nova.osapi_compute.wsgi.server [req-27f90911-7f89-45c1-80ba-34ed58f51c08 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "POST /v2.1/5c0b88983228434986d355142b27ae59/servers HTTP/1.1" status: 500 len: 507 time: 0.5376399
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions [req-50c53ea6-72cf-438a-b468-49da1d9c2657 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] Unexpected exception in API method
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions Traceback (most recent call last):
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/extensions.py", line 478, in wrapped
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return f(*args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 73, in wrapper
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 73, in wrapper
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/validation/__init__.py", line 73, in wrapper
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return func(*args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/api/openstack/compute/servers.py", line 629, in create
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     **create_kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/hooks.py", line 154, in inner
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     rv = f(*args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1562, in create
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     check_server_group_quota=check_server_group_quota)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1175, in _create_instance
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     instance_group, check_server_group_quota, filter_properties)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 1033, in _provision_instances
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     quotas.rollback()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self.force_reraise()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     six.reraise(self.type_, self.value, self.tb)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/compute/api.py", line 975, in _provision_instances
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     req_spec.create()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_versionedobjects/base.py", line 223, in wrapper
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return fn(self, *args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/nova/objects/request_spec.py", line 432, in create
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     db_spec = self._create_in_db(self._context, updates)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 708, in wrapper
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     with self._transaction_scope(context):
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return self.gen.next()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 759, in _transaction_scope
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     allow_async=self._allow_async) as resource:
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/contextlib.py", line 17, in __enter__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return self.gen.next()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 491, in _session
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     bind=self.connection, mode=self.mode)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 272, in _create_session
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self._start()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 338, in _start
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     engine_args, maker_args)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/enginefacade.py", line 362, in _setup_for_connection
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     sql_connection=sql_connection, **engine_kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 152, in create_engine
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     test_conn = _test_connection(engine, max_retries, retry_interval)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/oslo_db/sqlalchemy/engines.py", line 326, in _test_connection
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return engine.connect()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2018, in connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return self._connection_cls(self, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 72, in __init__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     if connection is not None else engine.raw_connection()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2104, in raw_connection
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self.pool.unique_connection, _connection)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2078, in _wrap_pool_connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     e, dialect, self)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 1401, in _handle_dbapi_exception_noconnection
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     util.raise_from_cause(newraise, exc_info)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/compat.py", line 200, in raise_from_cause
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     reraise(type(exception), exception, tb=exc_tb)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/base.py", line 2074, in _wrap_pool_connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return fn()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 318, in unique_connection
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return _ConnectionFairy._checkout(self)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 713, in _checkout
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     fairy = _ConnectionRecord.checkout(pool)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 480, in checkout
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     rec = pool._do_get()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1060, in _do_get
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self._dec_overflow()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     compat.reraise(exc_type, exc_value, exc_tb)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 1057, in _do_get
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return self._create_connection()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 323, in _create_connection
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return _ConnectionRecord(self)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 449, in __init__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self.connection = self.__connect()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/pool.py", line 607, in __connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     connection = self.__pool._invoke_creator(self)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/strategies.py", line 97, in connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return dialect.connect(*cargs, **cparams)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib64/python2.7/site-packages/sqlalchemy/engine/default.py", line 385, in connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return self.dbapi.connect(*cargs, **cparams)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/__init__.py", line 88, in Connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     return Connection(*args, **kwargs)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 657, in __init__
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self.connect()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 851, in connect
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     self._request_authentication()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 1034, in _request_authentication
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     auth_packet = self._read_packet()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 906, in _read_packet
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     packet.check_error()
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/connections.py", line 367, in check_error
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     err.raise_mysql_exception(self._data)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/err.py", line 120, in raise_mysql_exception
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     _check_mysql_exception(errinfo)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions   File "/usr/lib/python2.7/site-packages/pymysql/err.py", line 112, in _check_mysql_exception
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions     raise errorclass(errno, errorvalue)
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions OperationalError: (pymysql.err.OperationalError) (1040, u'Too many connections')
  2017-02-08 22:10:37.693 19170 ERROR nova.api.openstack.extensions 
  2017-02-08 22:10:37.702 19170 INFO nova.api.openstack.wsgi [req-50c53ea6-72cf-438a-b468-49da1d9c2657 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] HTTP exception thrown: Unexpected API Error. Please report this at http://bugs.launchpad.net/nova/ and attach the Nova API log if possible.
  <class 'sqlalchemy.exc.OperationalError'>
  2017-02-08 22:10:37.703 19170 INFO nova.osapi_compute.wsgi.server [req-50c53ea6-72cf-438a-b468-49da1d9c2657 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "POST /v2.1/5c0b88983228434986d355142b27ae59/servers HTTP/1.1" status: 500 len: 507 time: 0.5736270
  2017-02-08 22:11:03.353 19170 INFO nova.osapi_compute.wsgi.server [req-19939a6e-e863-483e-b481-f347b5539777 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "GET /v2.1/5c0b88983228434986d355142b27ae59 HTTP/1.1" status: 404 len: 264 time: 0.2591701
  2017-02-08 22:11:03.365 19170 INFO nova.osapi_compute.wsgi.server [req-8ca06bb1-8b26-470a-abef-5691732c3efd 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "GET /v2.1/ HTTP/1.1" status: 200 len: 652 time: 0.0086830
  2017-02-08 22:11:03.588 19170 INFO nova.osapi_compute.wsgi.server [req-d92d186a-0193-46fb-b514-ba1239412e7c 563cfa6210f84578a4ad846331723cab 5c0b88983228434986d355142b27ae59 - - -] 192.168.100.10 "GET /v2.1/5c0b88983228434986d355142b27ae59/os-services HTTP/1.1" status: 200 len: 1109 time: 0.0278270

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References

[Bug 1662789] [NEW] qlalchemy.exc.OperationalError
From: Kevin Wong, 2017-02-08