On 20/10/2020 11:02, Javier Pena wrote:

Hi guys.
I'm trying to deploy with "packstack --allinone" and
it always (tried ~5 times) fails with:
...
ERROR : Error appeared during Puppet
run:A.B.C.D_compute.pp
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
pymysql.err.OperationalError: (1040, 'Too many
connections')
You will find full trace in log
/var/tmp/packstack/20201018-183415-ik3ijyw7/manifests/172.24.154.202_compute.pp.log
Please check log file
/var/tmp/packstack/20201018-183415-ik3ijyw7/openstack-setup.log
for more information


If some expert might be interested then in
/var/tmp/packstack/20201018-183415-ik3ijyw7/manifests/172.24.154.202_compute.pp.log
....
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[DEFAULT/compute_driver]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[vnc/server_listen]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[libvirt/virt_type]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[libvirt/cpu_mode]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[libvirt/inject_password]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[libvirt/inject_key]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt/Nova_config[libvirt/inject_partition]/ensure:
created
Notice:
/Stage[main]/Nova::Migration::Libvirt/Nova_config[libvirt/live_migration_uri]/ensure:
created
Notice:
/Stage[main]/Nova::Compute::Libvirt::Services/Service[libvirt]/ensure:
ensure changed 'stopped' to 'running'
Notice:
/Stage[main]/Neutron::Deps/Anchor[neutron::service::begin]:
Triggered 'refresh' from 2 events
Notice:
/Stage[main]/Nova::Deps/Anchor[nova::config::end]:
Triggered 'refresh' from 22 events
Notice:
/Stage[main]/Nova::Deps/Anchor[nova::service::begin]:
Triggered 'refresh' from 1 event
Notice:
/Stage[main]/Nova::Compute/Nova::Generic_service[compute]/Service[nova-compute]/ensure:
ensure changed 'stopped' to 'running'
Notice:
/Stage[main]/Nova::Deps/Anchor[nova::service::end]:
Triggered 'refresh' from 1 event
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
An error has occurred:
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
Traceback (most recent call last):
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 2262, in _wrap_pool_connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return fn()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 294, in unique_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return _ConnectionFairy._checkout(self)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 751, in _checkout
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
fairy = _ConnectionRecord.checkout(pool)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 483, in checkout
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
rec = pool._do_get()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/impl.py",
line 138, in _do_get
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self._dec_overflow()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/util/langhelpers.py",
line 68, in __exit__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
compat.reraise(exc_type, exc_value, exc_tb)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py",
line 129, in reraise
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
raise value
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/impl.py",
line 135, in _do_get
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return self._create_connection()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 299, in _create_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return _ConnectionRecord(self)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 428, in __init__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self.__connect(first_connect_check=True)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 630, in __connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
connection = pool._invoke_creator(self)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/strategies.py",
line 114, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return dialect.connect(*cargs, **cparams)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/default.py",
line 453, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return self.dbapi.connect(*cargs, **cparams)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/__init__.py",
line 94, in Connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return Connection(*args, **kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 325, in __init__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self.connect()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 599, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self._request_authentication()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 861, in _request_authentication
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
auth_packet = self._read_packet()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 684, in _read_packet
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
packet.check_error()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/protocol.py",
line 220, in check_error
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
err.raise_mysql_exception(self._data)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/err.py",
line 109, in raise_mysql_exception
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
raise errorclass(errno, errval)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
pymysql.err.OperationalError: (1040, 'Too many
connections')
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:

Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
The above exception was the direct cause of the
following exception:
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:

Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
Traceback (most recent call last):
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/nova/cmd/manage.py",
line 2777, in main
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
ret = fn(*fn_args, **fn_kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/nova/cmd/manage.py",
line 1144, in discover_hosts
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
by_service)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/nova/objects/host_mapping.py",
line 256, in discover_hosts
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
cell_mappings = objects.CellMappingList.get_all(ctxt)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_versionedobjects/base.py",
line 184, in wrapper
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
result = fn(cls, context, *args, **kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/nova/objects/cell_mapping.py",
line 256, in get_all
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
db_mappings = cls._get_all_from_db(context)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py",
line 1013, in wrapper
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
with self._transaction_scope(context):
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File "/usr/lib64/python3.6/contextlib.py", line 81, in
__enter__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return next(self.gen)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py",
line 1063, in _transaction_scope
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
context=context) as resource:
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File "/usr/lib64/python3.6/contextlib.py", line 81, in
__enter__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return next(self.gen)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py",
line 658, in _session
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
bind=self.connection, mode=self.mode)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py",
line 418, in _create_session
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self._start()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py",
line 510, in _start
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
engine_args, maker_args)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/enginefacade.py",
line 534, in _setup_for_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
sql_connection=sql_connection, **engine_kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/debtcollector/renames.py",
line 43, in decorator
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return wrapped(*args, **kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/engines.py",
line 201, in create_engine
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
test_conn = _test_connection(engine, max_retries,
retry_interval)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/oslo_db/sqlalchemy/engines.py",
line 376, in _test_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return engine.connect()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 2193, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return self._connection_cls(self, **kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 103, in __init__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
else engine.raw_connection()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 2293, in raw_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self.pool.unique_connection, _connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 2266, in _wrap_pool_connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
e, dialect, self
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 1534, in _handle_dbapi_exception_noconnection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
util.raise_from_cause(newraise, exc_info)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py",
line 383, in raise_from_cause
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
reraise(type(exception), exception, tb=exc_tb,
cause=cause)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py",
line 128, in reraise
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
raise value.with_traceback(tb)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py",
line 2262, in _wrap_pool_connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return fn()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 294, in unique_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return _ConnectionFairy._checkout(self)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 751, in _checkout
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
fairy = _ConnectionRecord.checkout(pool)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 483, in checkout
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
rec = pool._do_get()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/impl.py",
line 138, in _do_get
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self._dec_overflow()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/util/langhelpers.py",
line 68, in __exit__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
compat.reraise(exc_type, exc_value, exc_tb)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py",
line 129, in reraise
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
raise value
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/impl.py",
line 135, in _do_get
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return self._create_connection()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 299, in _create_connection
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return _ConnectionRecord(self)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 428, in __init__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self.__connect(first_connect_check=True)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/pool/base.py",
line 630, in __connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
connection = pool._invoke_creator(self)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/strategies.py",
line 114, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return dialect.connect(*cargs, **cparams)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib64/python3.6/site-packages/sqlalchemy/engine/default.py",
line 453, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return self.dbapi.connect(*cargs, **cparams)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/__init__.py",
line 94, in Connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
return Connection(*args, **kwargs)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 325, in __init__
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self.connect()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 599, in connect
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
self._request_authentication()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 861, in _request_authentication
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
auth_packet = self._read_packet()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/connections.py",
line 684, in _read_packet
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
packet.check_error()
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/protocol.py",
line 220, in check_error
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
err.raise_mysql_exception(self._data)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:  
File
"/usr/lib/python3.6/site-packages/pymysql/err.py",
line 109, in raise_mysql_exception
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:    
raise errorclass(errno, errval)
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
sqlalchemy.exc.OperationalError:
(pymysql.err.OperationalError) (1040, 'Too many
connections')
Notice:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]/returns:
(Background on this error at: http://sqlalche.me/e/e3q8)
Error:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]:
Failed to call refresh: 'nova-manage  cell_v2
discover_hosts' returned 255 instead of one of [0]
Error:
/Stage[main]/Nova::Cell_v2::Discover_hosts/Exec[nova-cell_v2-discover_hosts]:
'nova-manage  cell_v2 discover_hosts' returned 255
instead of one of [0]

Hi,

This might happen if you have a lot of CPUs in your machine, since Packstack will spawn by default 1 worker per CPU on every service. In some cases, that is too much for the default MariaDB open file parameters.

Can you try adding "--service-workers=2" to your packstack command-line? Alternatively, you can set the CONFIG_SERVICE_WORKERS option in your answer file.

Yes! that seems to be the fix for my. Lots of cores in the box is my case.

Regards, Javier

Bit discouraging to fail at start but I trust you can
share some good advice.
I'm on Centos8 with ussuri.
Many thanks, L.